3510
2004
eng
324
325
other
Berliner Elektronenspeicherring-Gesellschaft für Synchrotronstrahlung
Berlin
0
--
--
--
Investigation of pore formation in metallic foams by synchrotron computed tomography
BESSY highlights - annual report 2003
3635
http://www.helmholtz-berlin.de/media/media/oea/web/pr_webseite/druckschriften/berichte/bessy/annualreport2003.pdf#page=324
0179-4159
Sonderstandort: Publica-Schrank
D 428/2003
A. Haibel
A. Rack
Gerd Weidemann
Heinrich Riesemeier
Jürgen Goebbels
J. Banhart
Verlagsliteratur
Physisches Exemplar in der Bibliothek der BAM vorhanden ("Hardcopy Access")
3511
2004
eng
326
328
other
Berliner Elektronenspeicherring-Gesellschaft für Synchrotronstrahlung
Berlin
0
--
--
--
Synchrotron-µ-tomography on complex materials
BESSY highlights - annual report 2003
3636
http://www.helmholtz-berlin.de/media/media/oea/web/pr_webseite/druckschriften/berichte/bessy/annualreport2003.pdf#page=326
0179-4159
Sonderstandort: Publica-Schrank
D 428/2003
A. Haibel
A. Rack
A. Bütow
H. Kropf
H.-M. Helwig
J. Banhart
Gerd Weidemann
Heinrich Riesemeier
Jürgen Goebbels
Verlagsliteratur
Physisches Exemplar in der Bibliothek der BAM vorhanden ("Hardcopy Access")
25976
2012
deu
135
136
1
103
article
Carl Hanser
München
Deutsche Gesellschaft für Materialkunde
1
--
--
--
Dreidimensionale Charakterisierung von Katalysatornanopartikeln
We present transmission electron microscope (TEM) tomography investigations of ruthenium-based fuel cell catalyst materials as employed in direct methanol fuel cells (DMFC). The digital three-dimensional representation of the samples not only enables detailed studies on number, size, and shape but also on the local orientation of the ruthenium particles to their support and their freely accessible surface area. The shape analysis shows the ruthenium particles deviate significantly from spherical symmetry which increases their surface to volume ratio. The morphological studies help to understand the structure formation mechanisms during the fabrication as well as the high effectiveness of these catalysts in the oxygen reduction reaction at the cathode side of fuel cells.
International journal of materials research
28711
1862-5282
Sonderstandort: Publica-Schrank
07.06.2012
R. Grothausmann
G. Zehl
I. Manke
S. Fiechter
P. Bogdanoff
I. Dorbandt
Andreas Kupsch
Axel Lange
Manfred P. Hentschel
G. Schumacher
J. Banhart
deu
uncontrolled
Radiography
deu
uncontrolled
Tomography
deu
uncontrolled
Neutrons
deu
uncontrolled
Polymer electrolyte membrane fuel cell (PEMFC)
deu
uncontrolled
Fuel cell stack
Verlagsliteratur
Physisches Exemplar in der Bibliothek der BAM vorhanden ("Hardcopy Access")
26317
2012
eng
120
125
219
article
Elsevier
Amsterdam [u.a.]
1
--
--
--
Neutron tomographic investigations of water distributions in polymer electrolyte membrane fuel cell stacks
Neutron tomography was applied to study the 3D water distribution in full polymer electrolyte membrane fuel cell (PEMFC) stacks. The water distribution after switch-off of the fuel cell was analyzed over a period of 36 h. We found a slowly increasing water amount in the fuel cell, but only few changes within a time period of 5 h, which is about the time necessary for neutron tomography. In this way, the requirement for successful tomography was obtained. It is demonstrated how the quasi in-situ tomography technique enables us to study the water content in individual flow field channels of three-fold stacks. Flow field as well as stack design issues are addressed by this visualization method showing weak points due to a non-uniform water distribution that can be identified by means of neutron imaging.
Journal of power sources
29073
10.1016/j.jpowsour.2012.07.043
0378-7753
Sonderstandort: Publica-Schrank
20.08.2012
H. Markötter
I. Manke
R. Kuhn
Tobias Arlt
N. Kardjilov
Manfred P. Hentschel
Andreas Kupsch
Axel Lange
C. Hartnig
J. Scholta
J. Banhart
eng
uncontrolled
Radiography
eng
uncontrolled
Tomography
eng
uncontrolled
Neutron imaging
eng
uncontrolled
Polymer electrolyte membrane fuel cell (PEMFC)
eng
uncontrolled
Manifold stack
eng
uncontrolled
Water management
Verlagsliteratur
Physisches Exemplar in der Bibliothek der BAM vorhanden ("Hardcopy Access")
26348
2012
deu
1
2
63
article
Wiley-VCH Verl.
Weinheim
Gesellschaft für Korrosionsschutz
1
--
--
--
Nanometer-Tomographie: kleinste Katalysatorteilchen erblicken - Mit Elektronen und Computern die mobile Brennstoffzelle erforschen
Materials and corrosion
29106
10.1002/maco.201290007
0947-5117
1521-4176
Sonderstandort: Publica-Schrank
23.08.2012
R. Grothausmann
G. Zehl
I. Manke
S. Fiechter
P. Bogdanoff
I. Dorbandt
Andreas Kupsch
Axel Lange
Manfred P. Hentschel
G. Schumacher
J. Banhart
deu
uncontrolled
Electron tomography
deu
uncontrolled
Polymer electrolyte membrane fuel cell (PEMFC)
deu
uncontrolled
Reconstruction algorithm
deu
uncontrolled
DIRECTT
Verlagsliteratur
Physisches Exemplar in der Bibliothek der BAM vorhanden ("Hardcopy Access")
27950
2013
deu
207
213
3
55
article
Hanser
München
Bundesanstalt für Materialforschung und -prüfung
1
--
--
--
Tomografische Methoden für die Brennstoffzellenforschung
Aufgrund des hohen Wirkungsgrades und der vielfältigen Einsatzmöglichkeiten können Brennstoffzellen einen wichtigen Beitrag zur zukünftigen Energieversorgung leisten. Für die Optimierung der Brennstoffzellentechnik ist es erforderlich, die während des Zellbetriebs ablaufenden Prozesse zu verstehen und exakt zu charakterisieren. Ein ausbalanciertes Wassermanagement ist die Grundlage für die optimale Leistungsfähigkeit einer wasserstoffbetriebenen Zelle. Das während des Betriebs entstehende Wasser muss die Membran ausreichend befeuchten, um deren Protonenleitfähigkeit aufrechtzuerhalten. Andererseits behindern zu große Wasseransammlungen in der Zelle die Gaszufuhr durch die porösen Materialien sowie in den Kanälen der Gasverteilerstrukturen. Alterungsphänomene einzelner Zellkomponenten können die Verteilung der Wasseransammlungen und somit das Wassermanagement empfindlich stören und so die Leistungsfähigkeit der Brennstoffzelle herabsetzen. Zur Analyse der Wasserverteilung werden zerstörungsfreie, bildgebende Methoden, wie die Ex-situ-Neutronentomografie und die In-situ-Synchrotronradiografie, eingesetzt. Diese Methoden können während des Brennstoffzellenbetriebs mit weiteren Messverfahren, beispielsweise der ortsaufgelösten Stromdichtemessung, kombiniert werden. Auf diese Weise werden einzelne Komponenten, wie zum Beispiel die Gasdiffusionsschichten, charakterisiert.
Materials Testing
30792
10.3139/120.110429
0025-5300
08.04.2013
Tobias Arlt
R. Grothausmann
I. Manke
H. Markötter
A. Hilger
N. Kardjilov
C. Tötzke
J. Banhart
Andreas Kupsch
Axel Lange
Manfred P. Hentschel
P. Krüger
J. Haußmann
C. Hartnig
K. Wippermann
deu
uncontrolled
Computertomographie
deu
uncontrolled
Elektronentomographie
deu
uncontrolled
Neutronentomographie
deu
uncontrolled
Brennstoffzelle
deu
uncontrolled
Stromdichtemessung
deu
uncontrolled
Wassermanagement
Eigenverlag BAM
Datei im Netzwerk der BAM verfügbar ("Closed Access")
25243
2011
eng
826
829
8
13
article
Elsevier B.V.
Amsterdam
1
--
--
--
Investigation of the three-dimensional ruthenium distribution in fresh and aged membrane electrode assemblies with synchrotron X-ray absorption edge tomography
Synchrotron X-ray absorption edge imaging was used to investigate the ruthenium distribution in both fresh and aged Pt/Ru-based membrane electrode assemblies (MEA) of direct methanol fuel cells. MEAs aged in different ways were analyzed: artificially aged by MeOH depletion and aged for 1700 h in an operating fuel cell stack. An element sensitive tomographic technique – differential X-ray absorption edge tomography – was applied allowing for a 3D-visualization of the ruthenium distribution within the MEA. We found a markedly changed Ru distribution after aging which is correlated to the GDL structure, the flow field geometry, and CO2 transport in the methanol solution.
Electrochemistry communications
27951
10.1016/j.elecom.2011.05.013
1388-2481
05.01.2012
Tobias Arlt
I. Manke
K. Wippermann
C. Tötzke
H. Markötter
Heinrich Riesemeier
J. Mergel
J. Banhart
eng
uncontrolled
Edge tomography
eng
uncontrolled
Ruthenium distribution
eng
uncontrolled
Direct methanol fuel cells
eng
uncontrolled
Synchrotron X-ray
eng
uncontrolled
PtRu corrosion
Verlagsliteratur
Datei im Netzwerk der BAM verfügbar ("Closed Access")
25244
2011
eng
1001
1004
9
13
article
Elsevier B.V.
Amsterdam
1
--
--
--
Investigation of 3D water transport paths in gas diffusion layers by combined in-situ synchrotron X-ray radiography and tomography
The three-dimensional water distribution and water transport paths in the gas diffusion layer (GDL) and the adjacent micro-porous layer (MPL) of a polymer electrolyte membrane fuel cell (PEMFC) were analyzed during cell operation. The technique of quasi in-situ X-ray tomography was used for a 3D visualization of the water distribution and the structure of the GDL at different operating conditions. Based on findings from in-situ radiographic measurements water transport paths were detected and subsequently examined by tomography. The combination of these 2D and 3D techniques allows for a fully three-dimensionally resolved visualization of transport paths through the GDL.
Electrochemistry communications
27952
10.1016/j.elecom.2011.06.023
1388-2481
05.01.2012
H. Markötter
I. Manke
P. Krüger
Tobias Arlt
J. Huassmann
M. Klages
Heinrich Riesemeier
C. Hartnig
J. Scholta
J. Banhart
eng
uncontrolled
Polymer electrolyte membrane fuel cell (PEMFC)
eng
uncontrolled
Radiography
eng
uncontrolled
Tomography
eng
uncontrolled
Synchrotron X-ray imaging
eng
uncontrolled
Gas diffusion layer (GDL)
eng
uncontrolled
Water transport paths
Verlagsliteratur
Datei im Netzwerk der BAM verfügbar ("Closed Access")
25348
2011
eng
379
386
1
41
article
Pennington, NJ, USA
Electrochemical Society
0
--
--
--
Investigation of carbon fiber gas diffusion layers by means of synchrotron X-ray tomography
The 3-dimensional spatial distribution of liquid water in different gas diffusion layer (GDL) materials was analyzed using synchrotron X-ray tomography. The capability of the method was demonstrated by virtually separating the GDL components in order to facilitate individual analysis of fiber material, liquid water and gas filled pore spaces. The influence of hydrophobic surface treatment on the water distribution in the GDL was illustrated by analyzing three GDL materials with different degrees of hydrophobicity. In the least hydrophobic sample, liquid water tends to form larger clusters which stretch out about several hundred µm inside the porous GDL. In contrast, only small water clusters were found in the strongly hydrophobic material with high Polytetrafluoroethylene (PTFE)-content as the liquid is partially pressed out of the GDL. Additionally, the influence of fiber orientation on the water distribution in the felt material was demonstrated.
ECS transactions
28058
10.1149/1.3635571
1938-6737
1938-5862
C. Tötzke
I. Manke
C. Hartnig
R. Kuhn
Heinrich Riesemeier
J. Banhart
eng
uncontrolled
Synchrotron X-ray tomography
eng
uncontrolled
Fuel cell
eng
uncontrolled
Gas diffusion layer (GDL) materials
eng
uncontrolled
Analysis of fiber material
Verlagsliteratur
Datei im Netzwerk der BAM verfügbar ("Closed Access")
24833
2011
eng
18161
18171
45
133
article
American Chemical Society
Washington, DC
1
--
--
--
Quantitative structural assessment of heterogeneous catalysts by electron tomography
We present transmission electron microscope (TEM) tomography investigations of ruthenium-based fuel cell catalyst materials as employed in direct methanol fuel cells (DMFC). The digital three-dimensional representation of the samples not only enables detailed studies on number, size, and shape but also on the local orientation of the ruthenium particles to their support and their freely accessible surface area. The shape analysis shows the ruthenium particles deviate significantly from spherical symmetry which increases their surface to volume ratio. The morphological studies help to understand the structure formation mechanisms during the fabrication as well as the high effectiveness of these catalysts in the oxygen reduction reaction at the cathode side of fuel cells.
Journal of the American chemical society
27522
10.1021/ja2032508
0002-7863
1520-5126
24.11.2011
R. Grothausmann
G. Zehl
I. Manke
S. Fiechter
P. Bogdanoff
I. Dorbandt
Andreas Kupsch
Axel Lange
Manfred P. Hentschel
G. Schumacher
J. Banhart
eng
uncontrolled
Electron tomography
eng
uncontrolled
Reconstruction algorithm
eng
uncontrolled
Catalyst
eng
uncontrolled
Fuel cell
Verlagsliteratur
Datei im Netzwerk der BAM verfügbar ("Closed Access")
25002
2011
deu
1
8
DGZfP-BB 127 (P7)
conferenceobject
Deutsche Gesellschaft für Zerstörungsfreie Prüfung (DGZfP)
0
--
--
--
Tomografische Methoden für die Brennstoffzellenforschung
Auf Grund des hohen Wirkungsgrades und der vielfältigen Einsatzmöglichkeiten stellen Brennstoffzellen sowie Brennstoffzellenverbünde eine vielversprechende Energiequelle dar. Daher ist es wichtig, die Prozesse während des Betriebs einer Brennstoffzelle exakt charakterisieren zu können, um diese im nächsten Schritt zu optimieren.
So ist ein ausbalanciertes Wassermanagement in einer mit Wasserstoff betriebenen Zelle ausschlaggebend für ihre Leistungsfähigkeit. Für eine dauerhafte Leistungsfähigkeit muss das entstehende Wasser die Membran feucht halten, um so die Protonenleitfähigkeit aufrecht zu erhalten. Zu viel Wasser kann jedoch die Gaszufuhr durch die porösen Materialien in Richtung Membran verhindern.
Alterungsphänomene der einzelnen Komponenten können dieses sensible Wassermanagement stören und so die Leistungsfähigkeit einer Brennstoffzelle
herabsetzen. Zum tieferen Verständnis der Wasserverteilung werden zerstörungsfreie Methoden, wie zum Beispiel die ex situ Neutronentomografie oder die in situ Synchrotronradiografie eingesetzt. Letztere Methode kann während des Brennstoffzellenbetriebs in Kombination mit weiteren Messmethoden, wie der ortsaufgelösten Stromdichtemessung, eingesetzt werden. So können einzelne Brennstoffzellenkomponenten, wie die Gasdiffusionsschichten, charakterisiert werden.
DGZfP-Jahrestagung 2011
27698
978-3-940283-33-7
urn:nbn:de:kobv:b43-250023
DGZfP-Jahrestagung 2011
Bremen, Germany
30.05.2011
01.06.2011
false
true
Creative Commons - Namensnennung
Tobias Arlt
R. Grothausmann
I. Manke
H. Markötter
P. Krüger
J. Haussmann
A. Hilger
N. Kardjilov
C. Hartnig
Andreas Kupsch
Axel Lange
Manfred P. Hentschel
K. Wippermann
J. Banhart
deu
uncontrolled
Computer-Tomographie
deu
uncontrolled
Rekonstruktionsalgorithmen
deu
uncontrolled
Röntgen-Kanten-Tomographie
deu
uncontrolled
Neutronen-Tomographie
deu
uncontrolled
Elektronen-Tomographie
Verlagsliteratur
Datei für die Öffentlichkeit verfügbar ("Open Access")
Wissenschaftliche Artikel der BAM
Bundesanstalt für Materialforschung und -prüfung (BAM)
https://opus4.kobv.de/opus4-bam/files/25002/p7.pdf
26282
2012
eng
689
692
7
7
article
IET
London
Institution of Engineering and Technology
1
--
--
--
Combined synchrotron X-ray radiography and tomography study of water transport in gas diffusion layers
Synchrotron X-ray radiography and tomography investigations of a custom-made polymer electrolyte membrane fuel cell optimised for visualisation purposes are presented. The 3D water distribution and transport pathways in the porous carbon fibre gas diffusion layers (GDLs) were investigated. The authors found that water is not only moving from the GDL into the channel, but can also take the opposite way, that is, from the channel into free pore space of the GDL. Such movement of water into the opposite direction has been subject of speculations but has so far not yet been reported and might bring new insights into the general water transport behaviour, which might give new aspects to the general description of water transport processes and influence modelling assumptions to describe the process taking place in the GDL.
Micro & nano letters
29034
10.1049/mnl.2012.0410
1750-0443
Sonderstandort: Publica-Schrank
10.08.2012
H. Markötter
I. Manke
J. Haußmann
Tobias Arlt
M. Klages
P. Krüger
C. Hartnig
J. Scholta
Bernd R. Müller
Heinrich Riesemeier
J. Banhart
eng
uncontrolled
Synchrotron radiography
eng
uncontrolled
Synchrotron tomography
eng
uncontrolled
Gas diffusion layers
eng
uncontrolled
Water transport
Verlagsliteratur
Physisches Exemplar in der Bibliothek der BAM vorhanden ("Hardcopy Access")
17538
2008
eng
34
35
other
Berliner Elektronenspeicherring-Gesellschaft für Synchrotronstrahlung
Berlin
0
--
--
--
Nondestructive 3D insights into foamy metals and bioregenerative ceramics
BESSY highlights 2007
19605
http://www.helmholtz-berlin.de/media/media/oea/web/pr_webseite/druckschriften/infos/bessy/highlights2007.pdf#page=34
1611-6127
Sonderstandort: Publica-Schrank
A. Rack
S. Zabler
Heinrich Riesemeier
Gerd Weidemann
Bernd R. Müller
L. Helfen
M. Stiller
C. Knabe
Jürgen Goebbels
J. Banhart
eng
uncontrolled
X-ray Computed Tomography
eng
uncontrolled
Metal foams
eng
uncontrolled
Bioregenerative ceramics
Verlagsliteratur
Physisches Exemplar in der Bibliothek der BAM vorhanden ("Hardcopy Access")
18296
2008
eng
70780X-1 - 70780X-9
7078
conferenceobject
The International Society for Optical Engineering (SPIE)
0
--
--
--
The high-resolution synchrotron-based imaging stations at the BAMline (BESSY) and TopoTomo (ANKA)
The BAMline at the BESSY light source in Berlin and the TopoTomo beamline at the ANKA synchrotron facility in Karlsruhe (both Germany) operate in the hard X-ray regime (above 6 keV) with similiar photon flux density. For typical imaging applications, a double multilayer monochromator or a filtered white beam is used. In order to optimise the field of view and the resolution of the available indirect pixel detectors, different optical systems have been installed, adapted, respectively, to a large field of view (macroscope) and to high spatial resolution (microscope). They can be combined with different camera systems, ranging from 16-bit dynamic range slow-scan CCDs to fast CMOS cameras. The spatial resolution can be brought substantially beyond the micrometer limit by using a Bragg magnifier. The moderate flux of both beamlines compared to other 3rd generation light sources is compensated by a dedicated scintillator concept. For selected applications, X-ray beam collimation has proven to be a reliable approach to increase the available photon flux density. Absorption contrast, phase contrast, holotomography and refraction-enhanced imaging are used depending on the application. Additionally, at the TopoTomo beamline digital white beam synchrotron topography is performed, using the digital X-ray pixel detectors installed.
Developments in X-Ray Tomography VI (Proceedings of SPIE)
20423
10.1117/12.793721
0277-786X
Sonderstandort: Publica-Schrank
A. Rack
Heinrich Riesemeier
S. Zabler
T. Weitkamp
Bernd R. Müller
Gerd Weidemann
P. Modregger
J. Banhart
L. Helfen
A.N. Danilewsky
H.G. Gräber
R. Heldele
B. Mayzel
Jürgen Goebbels
T. Baumbach
eng
uncontrolled
Microtomography
eng
uncontrolled
Non-destructive evaluation
eng
uncontrolled
Coherent imaging
eng
uncontrolled
X-ray refraction
eng
uncontrolled
X-ray phase contrast
eng
uncontrolled
Synchrotron-CT
eng
uncontrolled
Synchrotron instrumentation
eng
uncontrolled
Scintillator
eng
uncontrolled
Bragg magnification
eng
uncontrolled
Holotomography
eng
uncontrolled
X-ray topography
Verlagsliteratur
Physisches Exemplar in der Bibliothek der BAM vorhanden ("Hardcopy Access")
19221
2009
deu
219
226
4
51
article
Hanser
München
Bundesanstalt für Materialforschung und -prüfung
1
--
--
--
Wasserverteilung in PEM-Brennstoffzellen - In-situ-Untersuchung mit Neutronenradiografie und -tomografie
In-situ-Neutronenradiografie wird erfolgreich eingesetzt, um flüssiges Wasser in Niedertemperatur-PEM-Brennstoffzellen während des Betriebs zerstörungsfrei abzubilden und das sogenannte Wassermanagement eine der größten Herausforderungen der Entwicklung durch Anpassung der Materialeigenschaften zu optimieren. Dabei werden die besonderen Eigenschaften der Neutronen genutzt, die metallische Bauteile relativ leicht durchdringen, während selbst kleine Wassermengen durch ihre starke Streuung leicht nachweisbar sind. Die relativ langen Messzeiten für die Neutronentomografie werden durch den Betrieb der Zelle im angehaltenen Zustand realisierbar, sodass die dreidimensionale Wasserverteilung darstellbar wird.
MP materials testing
21426
0025-5300
Sonderstandort: Publica-Schrank
07.04.2009
I. Manke
C. Hartnig
N. Kardjilov
A. Hilger
Axel Lange
Andreas Kupsch
J. Banhart
deu
uncontrolled
Neutronen-Radiographie
deu
uncontrolled
Neutronen-Tomographie
deu
uncontrolled
Tomographische Rekonstruktionsalgorithmen
deu
uncontrolled
Brennstoffzellen
deu
uncontrolled
In-Situ-Radiologie
Eigenverlag BAM
Physisches Exemplar in der Bibliothek der BAM vorhanden ("Hardcopy Access")
22730
2010
eng
26
34
1
10
article
Wiley-VCH
Weinheim
1
--
--
--
In situ synchrotron X-ray radiography investigations of water transport in PEM fuel cells
Water transport in an operating PEM fuel cell was investigated with synchrotron X-ray radiography with a spatial resolution of 3 µm and a temporal resolution of 5 s. This method allows for the detection of water accumulations with less than 10 µm diameter. We demonstrate that synchrotron X-ray imaging can dramatically expand the possibilities of imaging with high spatial and time resolution, especially as a complement to neutron radiography. Water transport processes from the first appearance of small water accumulations in the gas diffusion layer to their transport into the channel system were analysed in situ. Correlations between local effects such as water formation and operating conditions of the whole system, e.g. power variations, were found. A recently described eruptive water transport mechanism is analysed in detail.
Fuel Cells
25280
10.1002/fuce.200800123
1615-6846
1615-6854
Sonderstandort: Publica-Schrank
13.12.2010
I. Manke
C. Hartnig
N. Kardjilov
Heinrich Riesemeier
Jürgen Goebbels
R. Kuhn
P. Krüger
J. Banhart
eng
uncontrolled
Fuel cell
eng
uncontrolled
Gas diffusion layer
eng
uncontrolled
Imaging
eng
uncontrolled
Synchrotron
eng
uncontrolled
X-ray radiography
eng
uncontrolled
Two-phase flow
eng
uncontrolled
Water transport
Verlagsliteratur
Physisches Exemplar in der Bibliothek der BAM vorhanden ("Hardcopy Access")
26433
2012
eng
1
26
P02014
7
article
Inst. of Physics Publ.
London
1
--
--
--
Detection system for microimaging with neutrons
A new high-resolution detector setup for neutron imaging has been developed based on infinity-corrected optics with high light collection, combined with customized mounting hardware. The system can easily be installed, handled and fitted to any existing facility, avoiding the necessity of complex optical systems or further improved electronics (CCD). This is the first time optical magnification higher than 1:1 has been used with scintillator-based neutron detectors, as well as the first implementation of infinity corrected optics for neutron imaging, achieving the smallest yet reported effective pixel size of 3.375 µm. A novel transparent crystal scintillator (GGG crystal) has been implemented with neutrons for the first time to overcome limitations of traditional powder scintillators (Li6/ZnS, Gadox). The standardized procedure for resolution measurements with the Modulation Transfer Function (MTF) is summarized to facilitate comparison between instruments and facilities. Using this new detector setup, a resolution of 14.8 µm with a field of view of 6 mm × 6 mm has been achieved while maintaining reasonable count times. These advances open a wide range of new possible research applications and allow the potential for additional future developments.
Journal of Instrumentation
29200
10.1088/1748-0221/7/02/P02014
1748-0221
Sonderstandort: Publica-Schrank
10.09.2012
S. H. Williams
A. Hilger
N. Kardjilov
I. Manke
M. Strobl
P.A. Douissard
T. Martin
Heinrich Riesemeier
J. Banhart
eng
uncontrolled
Instrumentation for neutron sources
eng
uncontrolled
Neutron radiography
eng
uncontrolled
Neutron detectors (cold, thermal, fast neutrons)
Verlagsliteratur
Physisches Exemplar in der Bibliothek der BAM vorhanden ("Hardcopy Access")
26434
2012
eng
7757
7761
9
37
article
Elsevier
Oxford
International Association for Hydrogen Energy
1
--
--
--
Visualization of the water distribution in perforated gas diffusion layers by means of synchrotron X-ray radiography
Perforated gas diffusion layers (GDLs) of polymer electrolyte membrane fuel cells (PEMFCs) were investigated by means of in-situ synchrotron X-ray radiography during operation. We found a strong influence of perforations on the water distribution and transport in the investigated Toray TGP-H-090 GDL. The water occurs mainly around the perforations, while the holes themselves show varying water distributions. Some remain dry, while most of them fill up with liquid water after a certain period or might serve as drainage volume for effective water transport.
International journal of hydrogen energy
29201
10.1016/j.ijhydene.2012.01.141
0360-3199
Sonderstandort: Publica-Schrank
10.09.2012
H. Markötter
R. Alink
J. Haußmann
K. Dittmann
Tobias Arlt
F. Wieder
C. Tötzke
M. Klages
C. Reiter
Heinrich Riesemeier
J. Scholta
D. Gerteisen
J. Banhart
I. Manke
eng
uncontrolled
Polymer electrolyte membrane fuel cell (PEMFC)
eng
uncontrolled
Radiography
eng
uncontrolled
Synchrotron
eng
uncontrolled
X-ray imaging
eng
uncontrolled
Perforated gas diffusion layer (GDL)
eng
uncontrolled
Water transport
Verlagsliteratur
Physisches Exemplar in der Bibliothek der BAM vorhanden ("Hardcopy Access")
27372
2013
eng
210
216
221
article
Elsevier
Amsterdam [u.a.]
1
--
--
--
Investigation of the local catalyst distribution in an aged direct methanol fuel cell MEA by means of differential synchrotron X-ray absorption edge imaging with high energy resolution
Synchrotron X-ray absorption edge imaging with high energy resolution was applied to study aging of fuel cell catalyst materials. The combination of an imaging and a high X-ray energy resolution set-up allows acquiring spatially resolved XAS (XANES and EXAFS) spectra. We analyzed the two-dimensional distribution of Pt and Ru in fresh and aged fuel cell catalysts. Spatially resolved XAS images were taken at the RuK edge and at the PtL3 edge. Taking radiographs above and below the absorption edges provides quantitative information about the thickness of the catalytic materials and additional chemical information. A strong influence of the flow field channels and the structure of the gas diffusion layers on the thicknesses of the catalytic elements were found: a thinner catalyst layer was found below the ribs of the flow field geometries as well as under crossing points of fiber bundles of the woven gas diffusion layers.
Journal of power sources
30182
10.1016/j.jpowsour.2012.08.038
0378-7753
12.12.2012
Tobias Arlt
I. Manke
K. Wippermann
Heinrich Riesemeier
J. Mergel
J. Banhart
eng
uncontrolled
XAS
eng
uncontrolled
X-ray energy edge
eng
uncontrolled
Membrane electrode assembly
eng
uncontrolled
Direct methanol fuel cell
eng
uncontrolled
Aging mechanism
eng
uncontrolled
X-ray synchrotron radiography
Verlagsliteratur
Datei im Netzwerk der BAM verfügbar ("Closed Access")
29979
2014
eng
123
131
253
article
Elsevier
Amsterdam [u.a.]
1
--
--
--
Three-dimensional study of compressed gas diffusion layers using synchrotron X-ray imaging
We present a synchrotron X-ray tomographic study on the morphology of carbon fiber-based gas diffusion layer (GDL) material under compression. A dedicated compression device is used to provide well-defined compression conditions. A flat compression punch is employed to study the fiber geometry at different degrees of compression. Transport relevant geometrical parameters such as porosity, pore size and tortuosity distributions are calculated. The geometric properties notably change upon compression which has direct impact on transport conditions for gas and fluid flow. The availability of broad 3D paths, which are most important for the transport of liquid water from the catalyst layer through the GDL, is markedly reduced after compression. In a second experiment, we study the influence of the channel-land-pattern of the flow-field on shape and microstructure of the GDL. A flow-field compression punch is employed to reproduce the inhomogeneous compression conditions found during fuel cell assembly. While homogenously compressed underneath the land the GDL is much less and inhomogeneously compressed under the channel. The GDL material extends far into the channel volume where it can considerably influence gas and fluid flow. Loose fiber endings penetrate deeply into the channel and form obstacles for the discharge of liquid water droplets.
Journal of power sources
32918
10.1016/j.jpowsour.2013.12.062
0378-7753
16.01.2014
C. Tötzke
G. Gaiselmann
M. Osenberg
J. Bohner
Tobias Arlt
H. Markötter
A. Hilger
F. Wieder
Andreas Kupsch
Bernd R. Müller
Manfred P. Hentschel
J. Banhart
V. Schmidt
W. Lehnert
I. Manke
eng
uncontrolled
Synchrotron X-ray tomography
eng
uncontrolled
Gas diffusion layer (GDL)
eng
uncontrolled
Microstructure
eng
uncontrolled
Water transport path
eng
uncontrolled
Pore size analysis
eng
uncontrolled
Geometrical tortuosity
Verlagsliteratur
Datei im Netzwerk der BAM verfügbar ("Closed Access")
56164
2022
eng
111037
222
article
Elsevier Ltd.
1
--
--
--
Torsion of a rectangular bar: Complex phase distribution in 304L steel revealed by neutron tomography
Metastable austenitic stainless steel (304L) samples with a rectangular cross-section were plastically deformed in torsion during which they experienced multiaxial stresses that led to a complex martensitic phase distribution owing to the transformation induced plasticity effect. A three-dimensional characterization of the phase distributions in these cm-sized samples was carried out by wavelength-selective neutron tomography. It was found that quantitatively correct results are obtained as long as the samples do not exhibit any considerable preferential grain orientation. Optical microscopy, electron backscatter diffraction, and finite element modeling were used to verify and explain the results obtained by neutron tomography. Altogether, neutron tomography was shown to extend the range of microstructure characterization methods towards the meso- and macroscale.
Materials & Design
10.1016/j.matdes.2022.111037
0264-1275
urn:nbn:de:kobv:b43-561649
publish
03.11.2022
false
true
Creative Commons - CC BY - Namensnennung 4.0 International
K. Van Tran
R. Woracek
N. Kardjilov
Henning Markötter
D. Abou-Ras
S. Puplampu
C. Förster
D. Penumadu
C. F. O. Dahlberg
J. Banhart
I. Manke
eng
uncontrolled
Neutron tomography
eng
uncontrolled
Phase distribution
eng
uncontrolled
Rectangular cross-section
eng
uncontrolled
Torsion
eng
uncontrolled
Geometrical effect
Ingenieurwissenschaften und zugeordnete Tätigkeiten
8 Zerstörungsfreie Prüfung
8.5 Röntgenbildgebung
Material
Verlagsliteratur
Datei für die Öffentlichkeit verfügbar ("Open Access")
Wissenschaftliche Artikel der BAM
Bundesanstalt für Materialforschung und -prüfung (BAM)
https://opus4.kobv.de/opus4-bam/files/56164/Van_Tran_torsion_rectangular_bar_spectral_neutron_tomography.pdf
53419
2021
eng
7010011
11
7
article
MDPI
0
--
--
--
The Neutron Imaging Instrument CONRAD — Post‐Operational Review
The neutron imaging instrument CONRAD was operated as a part of the user program of the research reactor BER‐II at Helmholtz‐Zentrum Berlin (HZB) from 2005 to 2020. The Instrument was designed to use the neutron flux from the cold source of the reactor, transported by a curved neutron guide. The pure cold neutron spectrum provided a great advantage in the use of different neutron optical components such as focusing lenses and guides, solid‐state polarizers, Monochromators and phase gratings. The flexible setup of the instrument allowed for implementation of new methods including wavelength‐selective, dark‐field, phase‐contrast and imaging with polarized neutrons. In summary, these developments helped to attract a large number of scientists and industrial customers, who were introduced to neutron imaging and subsequently contributed to the Expansion of the neutron imaging community.
Journal of imaging
10.3390/ jimaging7010011
urn:nbn:de:kobv:b43-534190
publish
false
true
Creative Commons - CC BY - Namensnennung 4.0 International
N Kardjilov
I Manke
A Hilger
T Arlt
R Bradbury
Henning Markötter
R Woracek
M Strobel
W Treimer
J Banhart
eng
uncontrolled
Neutron imaging
eng
uncontrolled
Neutron scattering
eng
uncontrolled
Neutron instrument
eng
uncontrolled
Tomography
Analytische Chemie
8 Zerstörungsfreie Prüfung
8.5 Röntgenbildgebung
Chemie und Prozesstechnik
Verlagsliteratur
Datei für die Öffentlichkeit verfügbar ("Open Access")
Wissenschaftliche Artikel der BAM
Bundesanstalt für Materialforschung und -prüfung (BAM)
https://opus4.kobv.de/opus4-bam/files/53419/2021_Kardjilov_The_Neutron_Imaging_Instrument_CONRAD-Post-Operati.pdf
53364
2021
eng
117298
220
article
Elsevier Ltd.
1
--
--
--
Positron annihilation investigation of thermal cycling induced martensitic transformation in NiTi shape memory alloy
Thermal cycling of a Ni-excess NiTi alloy was conducted between 50 °C and liquid nitrogen temperature to induce martensitic transformations and to reverse them after. The starting point was an annealed and slowly cooled state, the end point a sample thermally cycled 1500 times. Positron annihilation lifetime spectra and Coincidence Doppler Broadening profiles were obtained in various states and at various tem- peratures. It was found that the initial state was low in defects with positron lifetimes close to that of bulk NiTi. Cycling lead to a continuous build-up of a defect structure up to 20 0 −50 0 cycles after which saturation was reached. Two types of defects created during cycling were identified, namely pure dislo- cations and vacancies attached to dislocations.
Acta Materialia
10.1016/j.actamat.2021.117298
urn:nbn:de:kobv:b43-533641
publish
17.11.2021
Creative Commons - CC BY - Namensnennung 4.0 International
M. Liu
P. Diercks
Anna Maria Manzoni
J. Čížek
U. Ramamurty
J. Banhart
eng
uncontrolled
Shape memory alloy
eng
uncontrolled
Thermal Cycling
eng
uncontrolled
Defects
eng
uncontrolled
Positron annihilation spectroscopy
eng
uncontrolled
Austenite-to-martensite phase transformation
Ingenieurwissenschaften und zugeordnete Tätigkeiten
5 Werkstofftechnik
5.1 Materialographie, Fraktographie und Alterung technischer Werkstoffe
5.2 Metallische Hochtemperaturwerkstoffe
Material
Verlagsliteratur
Datei für die Öffentlichkeit verfügbar ("Open Access")
Wissenschaftliche Artikel der BAM
Bundesanstalt für Materialforschung und -prüfung (BAM)
https://opus4.kobv.de/opus4-bam/files/53364/Liu-Positron annihilation of thermal cycling induced mart. transf. in NiTi SMA-ActaMater2021.pdf
55689
2022
eng
919
928
Pt 4
55
article
International Union of Crystallography
1
--
--
--
Temperature dependence in Bragg edge neutron transmission measurements
A systematic study has been carried out to investigate the neutron transmission signal as a function of sample temperature. In particular, the experimentally determined wavelength-dependent neutron attenuation spectra for a martensitic steel at temperatures ranging from 21 to 700°C are compared with simulated data. A theoretical description that includes the Debye–Waller factor in order to describe the temperature influence on the neutron cross sections was implemented in the nxsPlotter software and used for the simulations. The analysis of the attenuation coefficients at varying temperatures shows that the missing contributions due to elastic and inelastic scattering can be clearly distinguished: while the elastically scattered intensities decrease with higher temperatures, the inelastically scattered intensities increase, and the two can be separated from each other by analysing unique sharp features in the form of Bragg edges. This study presents the first systematic approach to quantify this effect and can serve as a basis , for example, to correct measurements taken during in situ heat treatments, in many cases being a prerequisite for obtaining quantifiable results.
Journal of Applied Crystallography
10.1107/S1600576722006549
urn:nbn:de:kobv:b43-556896
publish
14.09.2022
Creative Commons - CC BY - Namensnennung 4.0 International
A M Al-Falahat
N Kardjilov
R Woracek
M Boin
Henning Markötter
L T Kuhn
M Makowska
M Strobl
B Pfretzschner
J Banhart
I Manke
eng
uncontrolled
Neutron Bragg edge imaging
eng
uncontrolled
Debye–Waller factor
eng
uncontrolled
Temperature-dependent neutron transmission
eng
uncontrolled
Super martensitic stainless steel
Analytische Chemie
8 Zerstörungsfreie Prüfung
8.5 Röntgenbildgebung
Chemie und Prozesstechnik
Verlagsliteratur
Datei für die Öffentlichkeit verfügbar ("Open Access")
Wissenschaftliche Artikel der BAM
Bundesanstalt für Materialforschung und -prüfung (BAM)
https://opus4.kobv.de/opus4-bam/files/55689/Falahat_2022_Bragg-edge-temperature_in5052.pdf
36675
2016
eng
997
1008
Issue 3
49
article
International Union of Crystallography
Chester, UK
1
--
--
--
Nanoscale order in the frustrated mixed conductor La5.6WO12-Delta
This article reports a comprehensive investigation of the average and local structure of La5.6WO12-δ, which has excellent mixed proton, electron and oxide ion conduction suitable for device applications. Synchrotron X-ray and neutron powder diffraction show that a cubic fluorite supercell describes the average structure, with highly disordered lanthanum and oxide positions. On average, the tungsten sites are sixfold coordinated and a trace [3.7 (1.3)%] of anti-site disorder is detected. In addition to sharp Bragg reflections, strong diffuse neutron scattering is observed, which hints at short-range order. Plausible local configurations are considered and it is shown that the defect chemistry implies a simple 'chemical exchange' interaction that favours ordered WO6 octahedra. The local model is confirmed by synchrotron X-ray pair distribution function analysis and EXAFS experiments performed at the La K and W L-3 edges. It is shown that ordered domains of similar to 3.5 nm are found, implying that mixed conduction in La5.6WO12-δ is associated with a defective glassy-like anion sublattice. The origins of this ground state are proposed to lie in the nonbipartite nature of the face-centred cubic lattice and the pairwise interactions which link the orientation of neighbouring octahedral WO6 sites. This 'function through frustration' could provide a means of designing new mixed conductors.
Journal of Applied Crystallography
10.1107/S1600576716006415
1600-5767
urn:nbn:de:kobv:b43-366756
27.06.2016
Creative Commons - Namensnennung
Tobias Scherb
S. A. J. Kimber
Christiane Stephan
P. F. Henry
G. Schumacher
S. Escolástico
J. M. Serra
J. Seeger
J. Just
A.H. Hill
J. Banhart
eng
uncontrolled
neutron diffraction
eng
uncontrolled
x-ray diffraction
eng
uncontrolled
proton conductors
Ingenieurwissenschaften und zugeordnete Tätigkeiten
Verlagsliteratur
Datei für die Öffentlichkeit verfügbar ("Open Access")
Wissenschaftliche Artikel der BAM
Bundesanstalt für Materialforschung und -prüfung (BAM)
https://opus4.kobv.de/opus4-bam/files/36675/Scherb2016_reprint.pdf
37323
2015
eng
60
66
69
conferenceobject
Elsevier B.V.
Amsterdam, NL
1
--
--
--
Imaging with Cold Neutrons at the CONRAD-2 Facility
CONRAD-2 is an imaging instrument using low-energy (cold) neutrons. The instrument is installed at the end of a curved neutron guide which avoids the direct line of sight towards the reactor core. This ensures a very low background of high-energy neutrons and. photons at the sample position. The cold neutron beam provides a wavelength range which is suitable for phase-and diffraction-contrast imaging such as grating interferometry and Bragg edge mapping. The instrument is well suited for high resolution imaging due to the high efficiency of the very thin scintillators that can be used for the detection of cold neutrons. An instrument upgrade was performed recently as a part of an upgrade program for the cold neutron instrumentation at HZB. The parameters of the instrument as well as some research highlights will be presented.
Physics Procedia
10.1016/j.phpro.2015.07.008
1875-3892
urn:nbn:de:kobv:b43-373239
10th World Conference on Neutron Radiography (WCNR)
Grindelwald, SWITZERLAND
05.10.2014
10.10.2014
13.09.2016
Creative Commons - Namensnennung-Nicht kommerziell-Keine Bearbeitung
N. Kardjilov
A. Hilger
I. Manke
J. Banhart
Axel Griesche
eng
uncontrolled
iron embrittlement
eng
uncontrolled
neutron imaging
eng
uncontrolled
neutron instrumentation
eng
uncontrolled
cold neutrons
Analytische Chemie
Ingenieurwissenschaften und zugeordnete Tätigkeiten
Angewandte Physik
Verlagsliteratur
Datei für die Öffentlichkeit verfügbar ("Open Access")
Wissenschaftliche Artikel der BAM
Bundesanstalt für Materialforschung und -prüfung (BAM)
https://opus4.kobv.de/opus4-bam/files/37323/Kardjilov_Imaging with Cold Neutrons at the CONRAD-2 Facility.pdf
30545
2013
eng
195
202
29
45
article
Pennington, NJ, USA
Electrochemical Society
0
--
--
--
Investigation of fuel cell materials and liquid water transport by means of synchrotron imaging
Synchrotron imaging allows addressing various important issues in fuel cell research, for example water distribution and transport. The water distribution in polymer electrolyte membrane fuel cells (PEMFCs) was observed quasi in-situ directly after operation by means of synchrotron tomography. The 3D data set was compared with the tomogram of a dry cell in order to separate the water distribution from cell materials. Engineered transport pathways realized by perforating holes through the gas diffusion layer (GDL) are a recent approach to optimize water transport and cell performance. For some parameter sets a cell performance increase and an improvement of stabilization have already been proven. We present high resolution investigations of the water distribution in perforated GDLs of operating PEMFCs by means of in-situ synchrotron radiography. The surrounding areas of the holes exhibited a distinct hydrophilic character.
ECS transactions
33520
10.1149/04529.0195ecst
1938-6737
1938-5862
H. Markötter
J. Haußmann
R. Alink
K. Dittmann
C. Tötzke
P. Krüger
M. Klages
Tobias Arlt
Bernd R. Müller
Heinrich Riesemeier
J. Scholta
D. Gerteisen
I. Manke
J. Banhart
eng
uncontrolled
Gas-diffusion layers
eng
uncontrolled
Resolution neutron-radiography
eng
uncontrolled
X-ray radiography
eng
uncontrolled
Visualization
eng
uncontrolled
PEMFC
Verlagsliteratur
Datei im Netzwerk der BAM verfügbar ("Closed Access")
30548
2013
eng
22
24
34
article
Elsevier
Amsterdam
1
--
--
--
Influence of cracks in the microporous layer on the water distribution in a PEM fuel cell investigated by synchrotron radiography
Water evolution in the gas diffusion layer of a polymer electrolyte membrane fuel cell was visualized in situ by means of synchrotron X-ray radiography. Cracks in the microporous layer were identified as start points of efficient liquid water transfer paths through the gas diffusion layer. Quantitative analysis of the water flow rate through those arbitrarily distributed cracks into the gas channel revealed that they have a strong influence on the overall liquid water transport. This could find entry into future material design and simulation.
Electrochemistry communications
33523
10.1016/j.elecom.2013.04.006
1388-2481
14.04.2014
H. Markötter
J. Haußmann
R. Alink
C. Tötzke
Tobias Arlt
M. Klages
Heinrich Riesemeier
J. Scholta
D. Gerteisen
J. Banhart
I. Manke
eng
uncontrolled
Polymer electrolyte membrane fuel cell (PEMFC)
eng
uncontrolled
Radiography
eng
uncontrolled
Synchrotron X-ray imaging
eng
uncontrolled
Microporous layer (MPL)
eng
uncontrolled
Water transport
eng
uncontrolled
Liquid water flow rate
Verlagsliteratur
Datei im Netzwerk der BAM verfügbar ("Closed Access")
22609
2010
eng
1
6
article
Nature Publishing Group
London, UK
1
--
--
--
Three-dimensional imaging of magnetic domains
Magnetic domains have been the subject of much scientific investigation since their theoretical existence was first postulated by P.-E. Weiss over a century ago. Up to now, the three-dimensional (3D) domain structure of bulk magnets has never been observed owing to the lack of appropriate experimental methods. Domain analysis in bulk matter thus remains one of the most challenging tasks in research on magnetic materials. All current domain observation methods are limited to studying surface domains or thin magnetic films. As the properties of magnetic materials are strongly affected by their domain structure, the development of a technique capable of investigating the shape, size and distribution of individual domains in three dimensions is of great importance. Here, we show that the novel technique of Talbot-Lau neutron tomography with inverted geometry enables direct imaging of the 3D network of magnetic domains within the bulk of FeSi crystals.
Nature communications
25152
10.1038/ncomms1125
2041-1723
Sonderstandort: Publica-Schrank
02.12.2010
I. Manke
N. Kardjilov
R. Schäfer
A. Hilger
M. Strobl
M. Dawson
C. Grünzweig
G. Behr
Manfred P. Hentschel
C. David
Andreas Kupsch
Axel Lange
J. Banhart
eng
uncontrolled
Computed tomography
eng
uncontrolled
Reconstruction algorithm
eng
uncontrolled
Talbot-Lau neutron tomography
eng
uncontrolled
Magnetic domains
Verlagsliteratur
Physisches Exemplar in der Bibliothek der BAM vorhanden ("Hardcopy Access")
23962
2010
eng
1436
1438
10
12
article
Elsevier
Amsterdam
1
--
--
--
In-situ synchrotron X-ray radiography on high temperature polymer electrolyte fuel cells
In contrast to classical low temperature polymer electrolyte fuel cells (LT-PEFCs), the membrane conductivity in high temperature polymer electrolyte fuel cells (HT-PEFCs) (operating temperature ~ 160 °C) is based on proton transport within phosphorus-oxygen acids at different levels of hydration, orthophosphoric acid (H3PO4) being the simplest example. We present for the first time in-situ synchrotron X-ray radiography measurements applied to a HT-PEFC to gain insight into the local composition of the membrane electrode assembly (MEA) under dynamic operating conditions. Transmission changes during the radiographic measurements exhibit a clear influence of the formation of product water on the membrane composition.
Electrochemistry communications
26575
10.1016/j.elecom.2010.08.002
1388-2481
Sonderstandort: Publica-Schrank
05.07.2011
W. Maier
Tobias Arlt
C. Wannek
I. Manke
Heinrich Riesemeier
P. Krüger
J. Scholta
W. Lehnert
J. Banhart
D. Stolten
eng
uncontrolled
HT-PEFC
eng
uncontrolled
Synchrotron x-ray radiography
eng
uncontrolled
Membrane electrode assembly (MEA)
eng
uncontrolled
Phosphoric acid
Verlagsliteratur
Physisches Exemplar in der Bibliothek der BAM vorhanden ("Hardcopy Access")
20577
2009
eng
1559
1562
8
11
article
Elsevier
Amsterdam
1
--
--
--
High resolution synchrotron X-ray investigation of carbon dioxide evolution in operating direct methanol fuel cells
The carbon dioxide evolution and bubble formation in an operating fuel has been studied by means of synchrotron X-ray radiography. Two different observation directions have been chosen: a through-plane insight has been employed to track the formation of bubbles starting at the corner of the lands of the flow field; a depth profile of the carbon dioxide evolution has been derived from cross sectional studies describing an affected area of up to 100 µm. The dynamics of the bubble formation and detachment of the bubbles from the position of formation is strongly correlated with the current density. Cracks and breaks in the catalyst layer which result from the preparation process are visible under operating conditions and a possible swelling of the catalyst layer does not reach a complete vanishing of the cracks.
Electrochemistry communications
22885
10.1016/j.elecom.2009.05.047
1388-2481
Sonderstandort: Publica-Schrank
07.12.2009
C. Hartnig
I. Manke
J. Schloesser
P. Krüger
R. Kuhn
Heinrich Riesemeier
K. Wippermann
J. Banhart
eng
uncontrolled
DMFC
eng
uncontrolled
Carbon dioxide evolution
eng
uncontrolled
Synchrotron radiography
eng
uncontrolled
In situ study
eng
uncontrolled
Cross section
eng
uncontrolled
Through-plane
Verlagsliteratur
Physisches Exemplar in der Bibliothek der BAM vorhanden ("Hardcopy Access")
20583
2007
eng
5045
5055
15
55
article
Elsevier Science
Kidlington
1
--
--
--
Coarsening of grain-refined semi-solid Al-Ge32 alloy: X-ray microtomography and in situ radiography
Acta materialia
22891
10.1016/j.actamat.2007.05.028
1359-6454
1873-2453
Sonderstandort: Publica-Schrank
07.12.2009
S. Zabler
A. Rueda
A. Rack
Heinrich Riesemeier
P. Zaslansky
I. Manke
F. Garcia-Moreno
J. Banhart
eng
uncontrolled
Microtomography
eng
uncontrolled
Radiography
eng
uncontrolled
2D/3D imageanalysis
eng
uncontrolled
Technical binary alloys
eng
uncontrolled
LSW
Verlagsliteratur
Physisches Exemplar in der Bibliothek der BAM vorhanden ("Hardcopy Access")
23044
2010
deu
712
717
10
52
article
Hanser
München
Bundesanstalt für Materialforschung und -prüfung
1
--
--
--
Dreidimensionale Untersuchung der Wasserverteilung in einer Miniatur-PEM-Brennstoffzelle
MP materials testing
25611
0025-5300
Sonderstandort: Publica-Schrank
27.01.2011
P. Krüger
H. Markötter
M. Klages
J. Haußmann
Tobias Arlt
Heinrich Riesemeier
C. Hartnig
J. Banhart
I. Manke
J. Scholta
deu
uncontrolled
Resolution neutron-radiography
deu
uncontrolled
Local current distribution
deu
uncontrolled
Cells
deu
uncontrolled
Quantification
Eigenverlag BAM
Physisches Exemplar in der Bibliothek der BAM vorhanden ("Hardcopy Access")
23045
2010
deu
692
697
10
52
article
Hanser
München
Bundesanstalt für Materialforschung und -prüfung
1
--
--
--
Röntgen-Kanten-Tomografie und -Radiografie zur Untersuchung von Alterungseffekten in Brennstoffzellenmaterialien
MP materials testing
25612
0025-5300
Sonderstandort: Publica-Schrank
27.01.2011
Tobias Arlt
I. Manke
K. Wippermann
A. Schröder
J. Mergel
Heinrich Riesemeier
J. Banhart
deu
uncontrolled
Resolution neutron-radiography
deu
uncontrolled
Local current distribution
deu
uncontrolled
Water transport
deu
uncontrolled
Carbon-dioxide
deu
uncontrolled
Methanol
deu
uncontrolled
Platinum
deu
uncontrolled
Oxidation
Eigenverlag BAM
Physisches Exemplar in der Bibliothek der BAM vorhanden ("Hardcopy Access")
23046
2010
deu
698
704
10
52
article
Hanser
München
Bundesanstalt für Materialforschung und -prüfung
1
--
--
--
Hochauflösende Synchrotron-Radiografie
MP materials testing
25613
0025-5300
Sonderstandort: Publica-Schrank
27.01.2011
H. Markötter
I. Manke
C. Hartnig
P. Krüger
K. Wippermann
Tobias Arlt
G. Choinka
Heinrich Riesemeier
J. Banhart
deu
uncontrolled
PEM Fuel-cells
deu
uncontrolled
Local current distribution
deu
uncontrolled
Neutron imaging technique
deu
uncontrolled
Water transport
Eigenverlag BAM
Physisches Exemplar in der Bibliothek der BAM vorhanden ("Hardcopy Access")
33081
2015
eng
043702-1
043702-6
4
86
article
American Institute of Physics
Melville, NY, USA
1
--
--
--
A dedicated compression device for high resolution X-ray tomography of compressed gas diffusion layers
We present an experimental approach to study the three-dimensional microstructure of gas diffusion layer (GDL) materials under realistic compression conditions. A dedicated compression device was designed that allows for synchrotron-tomographic investigation of circular samples under well-defined compression conditions. The tomographic data provide the experimental basis for stochastic modeling of nonwoven GDL materials. A plain compression tool is used to study the fiber courses in the material at different compression stages. Transport relevant geometrical parameters, such as porosity, pore size, and tortuosity distributions, are exemplarily evaluated for a GDL sample in the uncompressed state and for a compression of 30 vol.%. To mimic the geometry of the flow-field, we employed a compression punch with an integrated channel-rib-profile. It turned out that the GDL material is homogeneously compressed under the ribs, however, much less compressed underneath the channel. GDL fibers extend far into the channel volume where they might interfere with the convective gas transport and the removal of liquid water from the cell.
Review of scientific instruments
36160
10.1063/1.4918291
0034-6748
1089-7623
23.04.2015
C. Tötzke
I. Manke
G. Gaiselmann
J. Bohner
Bernd R. Müller
Andreas Kupsch
Manfred P. Hentschel
V. Schmidt
J. Banhart
W. Lehnert
eng
uncontrolled
PEM fuel cell
eng
uncontrolled
Gas diffusion layer (GDL)
eng
uncontrolled
Compression device
eng
uncontrolled
X-ray tomography
eng
uncontrolled
Synchrotron
eng
uncontrolled
Tortuosity
Verlagsliteratur
Datei im Netzwerk der BAM verfügbar ("Closed Access")
34191
2015
eng
404
412
69
article
Elsevier B.V.
Amsterdam
1
--
--
--
Three-dimensional imaging of magnetic domains with neutron grating interferometry
This paper gives a brief overview on3D imaging of magnetic domains with shearing grating neutron tomography. We investigated the three-dimensional distribution of magnetic domain walls in the bulk of a wedge-shaped FeSi single crystal. The width of the magnetic domains wasanalyzed at different locations within the crystal. Magnetic domains close to the tip of the wedge are much smaller than in the bulk. Furthermore, the three-dimensional shape of individual domains wasinvestigated. We discuss prospects and limitations of the applied measurement technique.
Physics procedia
37320
10.1016/j.phpro.2015.07.057
1875-3892
urn:nbn:de:kobv:b43-341919
Die Aufnahme ist grundsätzlich falsch, da es sich bei "Physics procedia" nicht um eine Zeitschrift handelt, sondern um eine Tagungsband-Reihe. Die unten beschriebene Lösung wird aber bereits bei einigen anderen analog gelagerten Fällen durchgeführt, z. B. bei "Energy procedia". Die Tagungsband-Reihe findet sich in der Master Journal List bzw. in dem Journal Citation Report selbstverständlich nicht wieder, da es ja keine Zeitschrift ist. Allerdings wird die Tagungsband-Reihe sehr wohl von Thomson-Reuters für Ihre Datenbank ausgewertet, als "Book Series". Daher muss sichergestellt werden, dass die dort erscheinenden Artikel auch für die "1000-Euro-Liste" berücksichtigt werden. Die einfachste Lösung ist es, den Eintrag als Zeitschrift zu belassen, und das Häkchen bei "In MJL/CPCI von ISI enthalten" zu setzen. Das ist zwar formal nicht ganz korrekt, erzeugt aber das richtige Ergebnis. Jan Harloff-Puhr 16.9.2014
21.09.2015
Creative Commons - Namensnennung-Nicht kommerziell-Keine Bearbeitung
I. Manke
N. Kardjilov
R. Schäfer
A. Hilger
R. Grothausmann
M. Strobl
M. Dawson
C. Grünzweig
C. Tötzke
C. David
Andreas Kupsch
Axel Lange
Manfred P. Hentschel
J. Banhart
eng
uncontrolled
Neutron imaging
eng
uncontrolled
Tomography
eng
uncontrolled
Magnetic domains
eng
uncontrolled
Grating interferometry
eng
uncontrolled
Darkfield imaging
eng
uncontrolled
Shearing gratings
eng
uncontrolled
Talbot-Lau
eng
uncontrolled
Three-dimensional data quantification
eng
uncontrolled
Tomographic reconstruction
Verlagsliteratur
Datei für die Öffentlichkeit verfügbar ("Open Access")
Wissenschaftliche Artikel der BAM
Bundesanstalt für Materialforschung und -prüfung (BAM)
https://opus4.kobv.de/opus4-bam/files/34191/Manke_Three-Dimensional Imaging of Magnetic Domains.pdf
32409
2014
eng
203510-1 - 203510-8
20
115
article
American Institute of Physics
Melville, NY
1
--
--
--
Change in atomic coordination in a heavily deformed metallic glass
The local structure around Ni and La atoms in Al85Ni10La5 amorphous powder after ball milling was investigated by X-ray absorption spectroscopy. A continuous decrease in coordination number of Ni and La as a function of milling time was observed, while the nearest neighbour distance and the mean square atomic displacement did not change, pointing at the creation of free volume around the Ni and La atoms. These structural changes resemble those of a liquid upon temperature increase. The results are described by a shear band model in which the coordination numbers of Ni and La are different within and outside a shear band.
Journal of applied physics
35475
10.1063/1.4879682
0021-8979
1089-7550
Sonderstandort: Publica-Schrank
15.01.2015
Y. Liu
G. Schumacher
Heinrich Riesemeier
J. Banhart
eng
uncontrolled
X-ray-diffraction
eng
uncontrolled
Shear bands
eng
uncontrolled
Electron-irradiation
eng
uncontrolled
Positron lifetime
eng
uncontrolled
Structural model
eng
uncontrolled
Amorphous-alloys
eng
uncontrolled
Deformation
eng
uncontrolled
Temperature
eng
uncontrolled
EXAFS
eng
uncontrolled
State
Verlagsliteratur
Physisches Exemplar in der Bibliothek der BAM vorhanden ("Hardcopy Access")
32410
2014
eng
F7
F9
2
3
article
ECS
Pennington, NJ, USA
1
--
--
--
Influence of artificial aging of gas diffusion layers on the water management of PEM fuel cells
The influence of artificial aging of gas diffusion layers (GDL) on the water management within the GDL was investigated in-operando by synchrotron X-ray radiography. One GDL was subjected to an accelerated aging procedure in 30% H2O2 solution, while another GDL was pristine. Radiographic measurements were combined with temporally resolved electrical analyzes. Significant differences in cell voltage and water accumulation were observed during cell operation at steady-state conditions. The cell which contained the aged GDL featured a higher water amount especially at the anode side and a lower cell voltage.
ECS electrochemistry letters
35476
10.1149/2.004402eel
2162-8726
Sonderstandort: Publica-Schrank
15.01.2015
Tobias Arlt
M. Klages
M. Messerschmidt
Heinrich Riesemeier
J. Scholta
J. Banhart
I. Manke
eng
uncontrolled
Degradation
eng
uncontrolled
Liquid water
Verlagsliteratur
Physisches Exemplar in der Bibliothek der BAM vorhanden ("Hardcopy Access")
52166
2021
eng
132
9
article
Elsevier Ltd.
1
--
--
--
Spectral neutron tomography
Combined three-dimensional (3D) mapping of (micro-)structures with elemental and crystalline phase variations is of significant importance for the characterization of materials. Neutron wavelength selective imaging is a spectral imaging technique that exploits unique contrast differences e.g. for mapping dissimilar elemental, isotope, or phase compositions, and has the particular advantage of being applicable to sample volumes on the meso- and macroscale. While being mostly applied as radiography (2D) so far, we herein report that the extension to tomography allows for the display of the full spectral information for every voxel and in 3D. The development is supported by example data from a continuous as well as a pulsed neutron source. As a practical example, we collected 4D data sets (3D + spectral) of plastically deformed metastable stainless steel and herein demonstrate an improved quantification strategy for crystalline phase fractions. These exemplary results illustrate that localized phase transformations can be quantified even in complex geometries within centimeter-sized samples, and we will discuss the limits and future prospects of the technique that is not limited to crystalline materials.
Materials Today Advances
10.1016/j.mtadv.2021.100132
urn:nbn:de:kobv:b43-521668
publish
01.04.2021
Creative Commons - CC BY - Namensnennung 4.0 International
K. V. Tran
R. Woracek
N. Kardjilov
Henning Markötter
A. Hilger
W. Kockelmann
J. Kelleher
S. B. Puplampu
D. Penumadu
A. S. Tremsin
J. Banhart
I. Manke
eng
uncontrolled
4D tomographic data
eng
uncontrolled
Multi-energy CT
eng
uncontrolled
Spectral CT
eng
uncontrolled
Phase distribution
eng
uncontrolled
Full-field phase tomography
Ingenieurwissenschaften und zugeordnete Tätigkeiten
8 Zerstörungsfreie Prüfung
8.5 Röntgenbildgebung
Material
Verlagsliteratur
Datei für die Öffentlichkeit verfügbar ("Open Access")
Wissenschaftliche Artikel der BAM
Bundesanstalt für Materialforschung und -prüfung (BAM)
https://opus4.kobv.de/opus4-bam/files/52166/Tran_2021_Materials_Today_Advances_spectral_neutron_tomography.pdf
56910
2022
eng
1
13
222
article
Elsevier Ltd.
0
--
--
--
Torsion of a rectangular bar: Complex phase distribution in 304L steel revealed by neutron tomography
Metastable austenitic stainless steel (304L) samples with a rectangular cross-section were plastically deformed in torsion during which they experienced multiaxial stresses that led to a complex martensitic phase distribution owing to the transformation induced plasticity effect. A three-dimensional characterization of the phase distributions in these cm-sized samples was carried out by wavelength-selective neutron tomography. It was found that quantitatively correct results are obtained as long as the samples do not exhibit any considerable preferential grain orientation. Optical microscopy, electron backscatter diffraction, and finite element modeling were used to verify and explain the results obtained by neutron tomography. Altogether, neutron tomography was shown to extend the range of microstructure characterization methods towards the meso- and macroscale.
Materials & Design
10.1016/j.matdes.2022.111037
urn:nbn:de:kobv:b43-569101
publish
false
true
Creative Commons - CC BY - Namensnennung 4.0 International
K. V. Tran
R. Woracek
N. Kardjilov
Henning Markötter
D. Abou-Ras
S. Puplampu
C. Förster
D. Penumadu
C. F. O. Dahlberg
J. Banhart
I. Manke
eng
uncontrolled
Neutron tomography
eng
uncontrolled
Phase distribution
eng
uncontrolled
Rectangular cross-section
eng
uncontrolled
Torsion
eng
uncontrolled
Geometrical effect
Ingenieurwissenschaften und zugeordnete Tätigkeiten
8 Zerstörungsfreie Prüfung
8.5 Röntgenbildgebung
Material
Verlagsliteratur
Datei für die Öffentlichkeit verfügbar ("Open Access")
Wissenschaftliche Artikel der BAM
Bundesanstalt für Materialforschung und -prüfung (BAM)
https://opus4.kobv.de/opus4-bam/files/56910/Van_Tran_torsion_rectangular_bar_spectral_neutron_tomography.pdf