<?xml version="1.0" encoding="utf-8"?>
<export-example>
  <doc>
    <id>32414</id>
    <completedYear/>
    <publishedYear>2015</publishedYear>
    <thesisYearAccepted/>
    <language>eng</language>
    <pageFirst>1844</pageFirst>
    <pageLast>1849</pageLast>
    <pageNumber/>
    <edition/>
    <issue>5</issue>
    <volume>137</volume>
    <type>article</type>
    <publisherName>American Chemical Society</publisherName>
    <publisherPlace>Washington, DC</publisherPlace>
    <creatingCorporation/>
    <contributingCorporation/>
    <belongsToBibliography>1</belongsToBibliography>
    <completedDate>--</completedDate>
    <publishedDate>--</publishedDate>
    <thesisDateAccepted>--</thesisDateAccepted>
    <title language="eng">Adatoms underneath single porphyrin molecules on Au(111)</title>
    <abstract language="eng">The adsorption of porphyrin derivatives on a Au(111) surface was studied by scanning tunneling microscopy and spectroscopy at low temperatures in combination with density functional theory calculations. Different molecular appearances were found and could be assigned to the presence of single gold adatoms bonded by a coordination bond underneath the molecular monolayer, causing a characteristic change of the electronic structure of the molecules. Moreover, this interpretation could be confirmed by manipulation experiments of individual molecules on and off a single gold atom. This study provides a detailed understanding of the role of metal adatoms in surface–molecule bonding and anchoring and of the appearance of single molecules, and it should prove relevant for the imaging of related molecule–metal systems.</abstract>
    <parentTitle language="eng">Journal of the American chemical society</parentTitle>
    <identifier type="old">35480</identifier>
    <identifier type="doi">10.1021/ja510528x</identifier>
    <identifier type="url">http://pubs.acs.org/doi/pdf/10.1021/ja510528x</identifier>
    <identifier type="issn">0002-7863</identifier>
    <identifier type="issn">1520-5126</identifier>
    <identifier type="urn">urn:nbn:de:kobv:b43-324144</identifier>
    <enrichment key="date_peer_review">15.01.2015</enrichment>
    <licence>Creative Commons - Namensnennung 3.0</licence>
    <author>Johannes Mielke</author>
    <author>F. Hanke</author>
    <author>M.V. Peters</author>
    <author>S. Hecht</author>
    <author>M. Persson</author>
    <author>L. Grill</author>
    <collection role="literaturgattung" number="">Verlagsliteratur</collection>
    <collection role="fulltextaccess" number="">Datei für die Öffentlichkeit verfügbar ("Open Access")</collection>
    <collection role="unnumberedseries" number="">Wissenschaftliche Artikel der BAM</collection>
    <thesisPublisher>Bundesanstalt für Materialforschung und -prüfung (BAM)</thesisPublisher>
    <file>https://opus4.kobv.de/opus4-bam/files/32414/Adatoms underneath Single Porphyrin Molecules on Au111.pdf</file>
  </doc>
  <doc>
    <id>35803</id>
    <completedYear/>
    <publishedYear>2016</publishedYear>
    <thesisYearAccepted/>
    <language>eng</language>
    <pageFirst>1034</pageFirst>
    <pageLast>1041</pageLast>
    <pageNumber/>
    <edition/>
    <issue>2</issue>
    <volume>16</volume>
    <type>article</type>
    <publisherName>ACS</publisherName>
    <publisherPlace/>
    <creatingCorporation/>
    <contributingCorporation/>
    <belongsToBibliography>1</belongsToBibliography>
    <completedDate>--</completedDate>
    <publishedDate>--</publishedDate>
    <thesisDateAccepted>--</thesisDateAccepted>
    <title language="eng">Direct observation of photoinduced tautomerization in single molecules at a metal surface</title>
    <abstract language="eng">Molecular switches are of fundamental importance in nature, and light is an important stimulus to selectively drive the switching process. However, the local dynamics of a conformational change in these molecules remain far from being completely understood at the single-molecule level. Here, we report the direct observation of photoinduced tautomerization in single porphycene molecules on a Cu(111) surface by using a combination of low-temperature scanning tunneling microscopy and laser excitation in the near-infrared to ultraviolet regime. It is found that the thermodynamically stable trans configuration of porphycene can be converted to the metastable cis configuration in a unidirectional fashion by photoirradiation. The wavelength dependence of the tautomerization cross section exhibits a steep increase around 2 eV and demonstrates that excitation of the Cu d-band electrons and the resulting hot carriers play a dominant role in the photochemical process. Additionally, a pronounced isotope effect in the cross section (∼100) is observed when the transferred hydrogen atoms are substituted with deuterium, indicating a significant contribution of zero-point energy in the reaction. Combined with the study of inelastic tunneling electron-induced tautomerization with the STM, we propose that tautomerization occurs via excitation of molecular vibrations after photoexcitation. Interestingly, the observed cross section of ∼10–19 cm2 in the visible–ultraviolet region is much higher than that of previously studied molecular switches on a metal surface, for example, azobenzene derivatives (10–23–10–22 cm2). Furthermore, we examined a local environmental impact on the photoinduced tautomerization by varying molecular density on the surface and find substantial changes in the cross section and quenching of the process due to the intermolecular interaction at high density.</abstract>
    <parentTitle language="eng">Nano Letters</parentTitle>
    <identifier type="doi">10.1021/acs.nanolett.5b04092</identifier>
    <identifier type="issn">1530-6984</identifier>
    <identifier type="issn">1530-6992</identifier>
    <enrichment key="date_peer_review">26.04.2016</enrichment>
    <author>H. Böckmann</author>
    <author>S. Liu</author>
    <author>Johannes Mielke</author>
    <author>S. Gawinkowski</author>
    <author>J. Walluk</author>
    <author>L. Grill</author>
    <author>M. Wolf</author>
    <author>T. Kumagai</author>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>STM</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Pophycene</value>
    </subject>
    <collection role="ddc" number="543">Analytische Chemie</collection>
    <collection role="literaturgattung" number="">Verlagsliteratur</collection>
    <collection role="fulltextaccess" number="">Datei im Netzwerk der BAM verfügbar ("Closed Access")</collection>
  </doc>
  <doc>
    <id>34923</id>
    <completedYear/>
    <publishedYear>2015</publishedYear>
    <thesisYearAccepted/>
    <language>eng</language>
    <pageFirst>Paper 0855, 1713</pageFirst>
    <pageLast>1714</pageLast>
    <pageNumber/>
    <edition/>
    <issue>Suppl. 3</issue>
    <volume>21</volume>
    <type>article</type>
    <publisherName>Cambridge University Press</publisherName>
    <publisherPlace>New York, NY</publisherPlace>
    <creatingCorporation>Microscopy Society of America</creatingCorporation>
    <contributingCorporation/>
    <belongsToBibliography>1</belongsToBibliography>
    <completedDate>--</completedDate>
    <publishedDate>--</publishedDate>
    <thesisDateAccepted>--</thesisDateAccepted>
    <title language="eng">Improved spatial resolution of EDX/SEM for the elemental analysis of nanoparticles</title>
    <abstract language="eng">The interest in nanoparticles remains at a high level in fundamental research since many years and increasingly, nanoparticles are incorporated into consumer products to enhance their performance. Consequently, the accurate and rapid characterization of nanoparticles is more and more demanded. Electron microscopy (SEM, TSEM and TEM) is one of the few techniques which are able to image individual nanoparticles. It was demonstrated recently that the transmission electron microscopy at a SEM can successfully be applied as a standard method to characterize accurately the size (distribution) and shape of nanoparticles down to less than 10 nm.</abstract>
    <parentTitle language="eng">Microscopy and microanalysis</parentTitle>
    <identifier type="old">38073</identifier>
    <identifier type="doi">10.1017/S1431927615009344</identifier>
    <identifier type="issn">1431-9276</identifier>
    <identifier type="issn">1435-8115</identifier>
    <enrichment key="date_peer_review">23.11.2015</enrichment>
    <author>Johannes Mielke</author>
    <author>Steffi Rades</author>
    <author>Erik Ortel</author>
    <author>T. Salge</author>
    <author>Vasile-Dan Hodoroaba</author>
    <collection role="literaturgattung" number="">Verlagsliteratur</collection>
    <collection role="fulltextaccess" number="">Datei im Netzwerk der BAM verfügbar ("Closed Access")</collection>
  </doc>
  <doc>
    <id>34922</id>
    <completedYear/>
    <publishedYear>2015</publishedYear>
    <thesisYearAccepted/>
    <language>eng</language>
    <pageFirst>Paper 1200, 2403</pageFirst>
    <pageLast>2404</pageLast>
    <pageNumber/>
    <edition/>
    <issue>Suppl. 3</issue>
    <volume>21</volume>
    <type>article</type>
    <publisherName>Cambridge University Press</publisherName>
    <publisherPlace>New York, NY</publisherPlace>
    <creatingCorporation>Microscopy Society of America</creatingCorporation>
    <contributingCorporation/>
    <belongsToBibliography>1</belongsToBibliography>
    <completedDate>--</completedDate>
    <publishedDate>--</publishedDate>
    <thesisDateAccepted>--</thesisDateAccepted>
    <title language="eng">Assessment of different electron microscopy techniques for particle size quantification of potential nanomaterials</title>
    <abstract language="deu">While nano-scaled intermediate and consumer products are omnipresent in many industries, one challenge consists in the development of methods that reliably identify, characterize and quantify nanomaterials both as a substance and in various matrices. For product registration purposes, the European Commission proposed a definition for nanomaterial which requires a quantitative size determination of the primary particles in a sample down to sizes of 1 nm. According to a material is defined as nano if 50% of the primary particles are observed to comprise a smallest dimension &lt;100 nm. The NanoDefine project was set up to develop and validate a robust, readily implementable and cost-effective measurement approach to obtain a quantitative particle size distribution and to distinguish between nano and non-nano materials according to the definition Among the available particle sizing techniques, electron microscopy was found to be one option meeting most of the requirements of the regulation. However, the use of electron microscopy for particle sizing is often limited by cost per sample, availability in industry, particle agglomeration/aggregation, extremely broad size distributions, 2D materials and operator bias in case of manual evaluation.</abstract>
    <parentTitle language="eng">Microscopy and microanalysis</parentTitle>
    <identifier type="old">38072</identifier>
    <identifier type="doi">10.1017/S1431927615012799</identifier>
    <identifier type="issn">1431-9276</identifier>
    <identifier type="issn">1435-8115</identifier>
    <enrichment key="date_peer_review">23.11.2015</enrichment>
    <author>P. Müller</author>
    <author>Johannes Mielke</author>
    <author>Vasile-Dan Hodoroaba</author>
    <author>R. Kägi</author>
    <author>M. Ryner</author>
    <collection role="literaturgattung" number="">Verlagsliteratur</collection>
    <collection role="fulltextaccess" number="">Datei im Netzwerk der BAM verfügbar ("Closed Access")</collection>
  </doc>
  <doc>
    <id>39244</id>
    <completedYear/>
    <publishedYear>2017</publishedYear>
    <thesisYearAccepted/>
    <language>eng</language>
    <pageFirst>163</pageFirst>
    <pageLast>172</pageLast>
    <pageNumber/>
    <edition/>
    <issue>1</issue>
    <volume>23</volume>
    <type>article</type>
    <publisherName>Cambridge University Press</publisherName>
    <publisherPlace/>
    <creatingCorporation/>
    <contributingCorporation/>
    <belongsToBibliography>1</belongsToBibliography>
    <completedDate>--</completedDate>
    <publishedDate>--</publishedDate>
    <thesisDateAccepted>--</thesisDateAccepted>
    <title language="eng">Evaluation of electrospray as a sample preparation tool for electron microscopic investigations: Toward quantitative evaluation of nanoparticles</title>
    <abstract language="eng">The potential of electrospray deposition, for the controlled preparation of particles for imaging in electron microscopes, is evaluated on various materials: from mono-modal suspensions of spherical particles to multimodal suspensions and to real-world industrial materials. It is shown that agglomeration is reduced substantially on the sample carrier, compared with conventional sample preparation techniques. For the first time, it is possible to assess the number concentration of a tri-modal polystyrene suspension by electron microscopy, due to the high Deposition efficiency of the electrospray. We discovered that some suspension stabilizing surfactants form artifact particles during electrospraying. These can be avoided by optimizing the sprayed suspension.</abstract>
    <parentTitle language="eng">Microscopy and Microanalysis</parentTitle>
    <identifier type="doi">10.1017/S1431927616012587</identifier>
    <identifier type="issn">1431-9276</identifier>
    <identifier type="issn">1435-8115</identifier>
    <enrichment key="date_peer_review">01.12.2017</enrichment>
    <author>Johannes Mielke</author>
    <author>P. Dohányosová</author>
    <author>P. Müller</author>
    <author>S. López-Vidal</author>
    <author>Vasile-Dan Hodoroaba</author>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Electrospary</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Nanoparticles</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Sample preparation</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>TEM grid</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>SEM</value>
    </subject>
    <collection role="ddc" number="543">Analytische Chemie</collection>
    <collection role="literaturgattung" number="">Verlagsliteratur</collection>
    <collection role="fulltextaccess" number="">Datei im Netzwerk der BAM verfügbar ("Closed Access")</collection>
  </doc>
  <doc>
    <id>42256</id>
    <completedYear/>
    <publishedYear>2017</publishedYear>
    <thesisYearAccepted/>
    <language>eng</language>
    <pageFirst>446</pageFirst>
    <pageLast>455</pageLast>
    <pageNumber/>
    <edition/>
    <issue>1</issue>
    <volume>426</volume>
    <type>article</type>
    <publisherName>Elsevier B.V.</publisherName>
    <publisherPlace>Amsterdam</publisherPlace>
    <creatingCorporation/>
    <contributingCorporation/>
    <belongsToBibliography>1</belongsToBibliography>
    <completedDate>--</completedDate>
    <publishedDate>--</publishedDate>
    <thesisDateAccepted>--</thesisDateAccepted>
    <title language="eng">TSEM-based contour analysis as a tool for the quantification of the profile roughness of silica shells on polystyrene core particles</title>
    <abstract language="eng">Core-shell (CS) particles with  a polymeric core and a silica shell play an important role in the materials and (bio)analytical sciences. Besides the establishment of reliable synthesis procedures, comprehensive particle characterization is essential for batch-to-batch reproducibility and objective performance assessment across architectures, protocols, and laboratories. Particle characterization with respect to size, size distribution, shell thickness and texture, surface area and roughness or materials composition is commonly conducted with different analytical methods, often on different samples. Our approach uses a dual-mode TSEM/SEM set-up with an EDX detector to obtain a complementary data set with sufficient statistical confidence of one and the same sample on a single instrument. Our protocol reveals information about size, size distribution and shell thickness of the various particles employed from overview images, while an increased field of view (FOV) and high-resolution EDX analysis yields detailed information on shell texture and elemental composition. An image analysis tool was developed to derive and quantify the profile roughness of CS particles from individual beads. Comparison with surface roughness data from AFM showed a similar trend in roughness across the series of particles. Reliable classification into smooth and rough is proposed and roughness changes within different particle batches were tracked systematically.</abstract>
    <parentTitle language="eng">Applied Surface Science</parentTitle>
    <identifier type="doi">10.1016/j.apsusc.2017.07.099</identifier>
    <identifier type="issn">0169-4332</identifier>
    <identifier type="issn">1873-5584</identifier>
    <enrichment key="date_peer_review">17.11.2017</enrichment>
    <author>Dominik Sarma</author>
    <author>Johannes Mielke</author>
    <author>Mario Sahre</author>
    <author>Uwe Beck</author>
    <author>Vasile-Dan Hodoroaba</author>
    <author>Knut Rurack</author>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Core-shell particles</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Electron microscopy</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Transmission mode</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Roughness</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Image analysis</value>
    </subject>
    <collection role="ddc" number="543">Analytische Chemie</collection>
    <collection role="literaturgattung" number="">Verlagsliteratur</collection>
    <collection role="fulltextaccess" number="">Datei im Netzwerk der BAM verfügbar ("Closed Access")</collection>
  </doc>
  <doc>
    <id>35562</id>
    <completedYear/>
    <publishedYear>2016</publishedYear>
    <thesisYearAccepted/>
    <language>eng</language>
    <pageFirst>012006-1</pageFirst>
    <pageLast>012006-12</pageLast>
    <pageNumber/>
    <edition/>
    <issue/>
    <volume>109</volume>
    <type>article</type>
    <publisherName>IOP Publishing Ltd</publisherName>
    <publisherPlace>Bristol, UK</publisherPlace>
    <creatingCorporation>IOP Publishing Ltd</creatingCorporation>
    <contributingCorporation/>
    <belongsToBibliography>1</belongsToBibliography>
    <completedDate>--</completedDate>
    <publishedDate>--</publishedDate>
    <thesisDateAccepted>--</thesisDateAccepted>
    <title language="eng">Characterisation of nanoparticles by means of high-resolution SEM/EDS in transmission mode</title>
    <abstract language="eng">Advances in scanning electron microscopy (SEM) enable the high-resolution imaging of single nanoparticles (NPs) with sizes well below 10 nm. The SEM analysis in transmission mode (T-SEM) of NPs on thin film supports has many benefits when compared to the analysis of NPs on bulk substrates. The enhanced material (mass – thickness) contrast of the T-SEM imaging mode is well suited for in-depth and, particularly valuable, to very accurate, traceable, lateral dimensional measurements of NPs. Compared to samples prepared on bulk substrates, T-SEM with energy dispersive X-ray spectroscopy (EDS) achieves a drastically improved spatial resolution of the emitted X-rays. The poor signal-to-noise ratio of the X-ray spectra emitted by a single nanoparticle (NP) can be improved by the use of high-sensitivity (high collection solid angle) silicon drift (SDD), energy-dispersive X-ray spectrometers (EDS). The EDS spectral imaging of a single NP with a spatial resolution below 10 nm has become possible. This is demonstrated by means of various examples of nanostructures. Advanced data processing of T-SEM/EDS results sets the stage for the automated classification of NPs by feature analysis. This method combines the detection of morphological structures of interest by image processing of T-SEM micrographs with the chemical classification by EDS.</abstract>
    <parentTitle language="eng">IOP Conf. Series: Materials Science and Engineering</parentTitle>
    <identifier type="doi">10.1088/1757-899X/109/1/012006</identifier>
    <identifier type="url">http://iopscience.iop.org/article/10.1088/1757-899X/109/1/012006</identifier>
    <identifier type="issn">1757-899X</identifier>
    <identifier type="urn">urn:nbn:de:kobv:b43-355628</identifier>
    <enrichment key="eventName">European Microbeam Analysis Society’s 14th European Workshop on Modern Developments and Applications in Microbeam Analysis (EMAS 2015)</enrichment>
    <enrichment key="eventPlace">Portorož, Slovenia</enrichment>
    <enrichment key="eventStart">03.05.2015</enrichment>
    <enrichment key="eventEnd">07.05.2015</enrichment>
    <enrichment key="date_peer_review">30.09.2016</enrichment>
    <licence>Creative Commons - Namensnennung 3.0</licence>
    <author>Vasile-Dan Hodoroaba</author>
    <author>Steffi Rades</author>
    <author>T. Salge</author>
    <author>Johannes Mielke</author>
    <author>Erik Ortel</author>
    <author>R. Schmidt</author>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>High-resolution</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>SEM</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>T-SEM</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>EDX</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Nanoparticles</value>
    </subject>
    <collection role="ddc" number="543">Analytische Chemie</collection>
    <collection role="ddc" number="620">Ingenieurwissenschaften und zugeordnete Tätigkeiten</collection>
    <collection role="literaturgattung" number="">Verlagsliteratur</collection>
    <collection role="fulltextaccess" number="">Datei für die Öffentlichkeit verfügbar ("Open Access")</collection>
    <collection role="unnumberedseries" number="">Wissenschaftliche Artikel der BAM</collection>
    <thesisPublisher>Bundesanstalt für Materialforschung und -prüfung (BAM)</thesisPublisher>
    <file>https://opus4.kobv.de/opus4-bam/files/35562/Hodoroaba_EMAS2015.pdf</file>
  </doc>
  <doc>
    <id>36792</id>
    <completedYear/>
    <publishedYear>2016</publishedYear>
    <thesisYearAccepted/>
    <language>eng</language>
    <pageFirst>Article 158, 1</pageFirst>
    <pageLast>40</pageLast>
    <pageNumber/>
    <edition/>
    <issue>6</issue>
    <volume>18</volume>
    <type>article</type>
    <publisherName>Springer</publisherName>
    <publisherPlace/>
    <creatingCorporation/>
    <contributingCorporation/>
    <belongsToBibliography>1</belongsToBibliography>
    <completedDate>--</completedDate>
    <publishedDate>--</publishedDate>
    <thesisDateAccepted>--</thesisDateAccepted>
    <title language="eng">How reliably can a material be classified as a nanomaterial? Available particle-sizing techniques at work</title>
    <abstract language="eng">Currently established and projected regulatory frameworks require the classification of materials (whether nano or non-nano) as specified by respective definitions, most of which are based on the size of the constituent particles. This brings up the question if currently available techniques for particle size determination are capable of reliably classifying materials that potentially fall under these definitions.&#13;
In this study, a wide variety of characterisation techniques, including counting, fractionating, and spectroscopic techniques, has been applied to the same set of materials under harmonised conditions.&#13;
The selected materials comprised well-defined Quality control materials (spherical, monodisperse) as well as industrial materials of complex shapes and considerable polydispersity. As a result, each technique could be evaluated with respect to the determination of the number-weighted median size. Recommendations on the most appropriate and efficient use of techniques for different types of material are given.</abstract>
    <parentTitle language="eng">Journal of Nanoparticle Research</parentTitle>
    <identifier type="doi">10.1007/s11051-016-3461-7</identifier>
    <identifier type="url">http://link.springer.com/article/10.1007/s11051-016-3461-7</identifier>
    <identifier type="issn">1388-0764</identifier>
    <identifier type="issn">1572-896X</identifier>
    <identifier type="urn">urn:nbn:de:kobv:b43-367922</identifier>
    <enrichment key="date_peer_review">24.11.2016</enrichment>
    <licence>Creative Commons - Namensnennung 3.0</licence>
    <author>F. Babick</author>
    <author>Johannes Mielke</author>
    <author>W. Wohlleben</author>
    <author>St. Weigel</author>
    <author>Vasile-Dan Hodoroaba</author>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Nanomaterial classification</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Nanoparticle</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Number-weighted median size</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Tiered</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Particle size analysis</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Nanometrology</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Characterisation techniques</value>
    </subject>
    <collection role="ddc" number="543">Analytische Chemie</collection>
    <collection role="literaturgattung" number="">Verlagsliteratur</collection>
    <collection role="fulltextaccess" number="">Datei für die Öffentlichkeit verfügbar ("Open Access")</collection>
    <collection role="unnumberedseries" number="">Wissenschaftliche Artikel der BAM</collection>
    <thesisPublisher>Bundesanstalt für Materialforschung und -prüfung (BAM)</thesisPublisher>
    <file>https://opus4.kobv.de/opus4-bam/files/36792/Supplementary material.pdf</file>
    <file>https://opus4.kobv.de/opus4-bam/files/36792/Mielke_et_al-How-reliably-can-a-material-be-classified-as-a-nanomaterial.pdf</file>
  </doc>
  <doc>
    <id>33258</id>
    <completedYear/>
    <publishedYear>2015</publishedYear>
    <thesisYearAccepted/>
    <language>eng</language>
    <pageFirst>NUR code:972 - Materials Science, 187-199</pageFirst>
    <pageLast/>
    <pageNumber/>
    <edition/>
    <issue/>
    <volume/>
    <type>conferenceobject</type>
    <publisherName/>
    <publisherPlace/>
    <creatingCorporation>European microbeam analysis society (EMAS)</creatingCorporation>
    <contributingCorporation/>
    <belongsToBibliography>1</belongsToBibliography>
    <completedDate>--</completedDate>
    <publishedDate>--</publishedDate>
    <thesisDateAccepted>--</thesisDateAccepted>
    <title language="eng">Characterisation of nanoparticles by means of high-resolution SEM/EDS</title>
    <abstract language="eng">Advances in scanning electron microscopy (SEM) enable the high-resolution imaging of single nanoparticles (NPs) with sizes well below 10 nm. The SEM analysis in transmission mode (T-SEM) of NPs on thin film supports has many benefits when compared to the analysis of NPs on bulk substrates. The enhanced material (mass - thickness) contrast of the T-SEM imaging mode is well suited for in-depth and, particularly valuable, to very accurate, traceable, lateral dimensional measurements of NPs. Compared to samples prepared on bulk substrates, T-SEM with energy dispersive X-ray spectroscopy (EDS) achieves a drastically improved spatial resolution of the emitted X-rays. The poor signal-to-noise ratio of the X-ray spectra emitted by a single nanoparticle (NP) can be improved by the use of high-sensitivity (high collection solid angle) silicon drift (SDD), energy-dispersive X-ray spectrometers (EDS). The EDS spectral imaging of a single NP with a spatial resolution below 10 nm has become possible. This is demonstrated by means of various examples of nanostructures. Advanced data processing of T-SEM/EDS results sets the stage for the automated classification of NPs by feature analysis. This method combines the detection of morphological structures of interest by image processing of T-SEM micrographs with the chemical classification by EDS.</abstract>
    <parentTitle language="eng">EMAS 2015 - 14th European workshop on modern developments and applications in microbeam analysis</parentTitle>
    <identifier type="old">36347</identifier>
    <identifier type="isbn">978-90-8227-691-6</identifier>
    <identifier type="doi">10.1088/1757-899X/109/1/012006</identifier>
    <enrichment key="eventName">EMAS 2015 - 14th European workshop on modern developments and applications in microbeam analysis</enrichment>
    <enrichment key="eventPlace">Portoroz, Slovenia</enrichment>
    <enrichment key="eventStart">03.05.2015</enrichment>
    <enrichment key="eventEnd">07.05.2015</enrichment>
    <enrichment key="date_peer_review">28.05.2015</enrichment>
    <author>Vasile-Dan Hodoroaba</author>
    <author>Steffi Rades</author>
    <author>T. Salge</author>
    <author>Johannes Mielke</author>
    <author>Erik Ortel</author>
    <author>R. Schmidt</author>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>SEM</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>T-SEM</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>EDX</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Nanoparticles</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>High-resolution</value>
    </subject>
    <collection role="literaturgattung" number="">Verlagsliteratur</collection>
    <collection role="fulltextaccess" number="">Datei im Netzwerk der BAM verfügbar ("Closed Access")</collection>
  </doc>
  <doc>
    <id>53884</id>
    <completedYear/>
    <publishedYear>2021</publishedYear>
    <thesisYearAccepted/>
    <language>eng</language>
    <pageFirst>1</pageFirst>
    <pageLast>10</pageLast>
    <pageNumber/>
    <edition/>
    <issue>6</issue>
    <volume>24</volume>
    <type>article</type>
    <publisherName>Wiley-VCH</publisherName>
    <publisherPlace/>
    <creatingCorporation/>
    <contributingCorporation/>
    <belongsToBibliography>1</belongsToBibliography>
    <completedDate>--</completedDate>
    <publishedDate>--</publishedDate>
    <thesisDateAccepted>--</thesisDateAccepted>
    <title language="eng">Customizing New Titanium Dioxide Nanoparticles with Controlled Particle Size and Shape Distribution: A Feasibility Study Toward Reference Materials for Quality Assurance of Nonspherical Nanoparticle Characterization</title>
    <abstract language="eng">An overview is given on the synthesis of TiO2 nanoparticles with well-defined nonspherical shapes (platelet like, bipyramidal, and elongated), with the focus on controlled, reproducible synthesis, as a key requirement for the production of reference materials with homogeneous and stable properties. Particularly with regard to the nanoparticle shapes, there is a high need of certified materials, &#13;
solely one material of this type being commercially available since a few months (elongated TiO2). Further, measurement approaches with electron microscopy as the golden method to tackle the nanoparticle shape are developed to determine accurately the size and shape distribution for such nonspherical particles. A prerequisite for accurate and easy (i.e., automated) image analysis is the sample preparation, which ideally must ensure a deposition of the nanoparticles from liquid suspension onto a substrate such that the particles do not overlap, are solvent-free, and have a high deposition density. Challenges in the Synthesis of perfectly monodispersed and solvent-free TiO2 nanoparticles of platelet and acicular shapes are highlighted as well as successful measurement approaches on how to extract from 2D projection electron micrographs the most accurate spatial information, that is, true 3D size, for example, of the bipyramidal nanoparticles with different geometrical orientations on a substrate.</abstract>
    <parentTitle language="eng">Advanced Engineering Materials</parentTitle>
    <identifier type="doi">10.1002/adem.202101347</identifier>
    <identifier type="urn">urn:nbn:de:kobv:b43-538849</identifier>
    <enrichment key="opus.source">publish</enrichment>
    <enrichment key="date_peer_review">09.12.2021</enrichment>
    <licence>Creative Commons - CC BY - Namensnennung 4.0 International</licence>
    <author>Francesco Pellegrino</author>
    <author>Erik Ortel</author>
    <author>Johannes Mielke</author>
    <author>R. Schmidt</author>
    <author>V. Maurino</author>
    <author>Vasile-Dan Hodoroaba</author>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Nanoparticles</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Titanium dioxide</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Reference materials</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Standardisation</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Particle size and shape distribution</value>
    </subject>
    <collection role="ddc" number="620">Ingenieurwissenschaften und zugeordnete Tätigkeiten</collection>
    <collection role="institutes" number="">6 Materialchemie</collection>
    <collection role="institutes" number="">6.1 Oberflächen- und Dünnschichtanalyse</collection>
    <collection role="themenfelder" number="">Material</collection>
    <collection role="literaturgattung" number="">Verlagsliteratur</collection>
    <collection role="fulltextaccess" number="">Datei für die Öffentlichkeit verfügbar ("Open Access")</collection>
    <collection role="unnumberedseries" number="">Wissenschaftliche Artikel der BAM</collection>
    <collection role="themenfelder" number="">Advanced Materials</collection>
    <thesisPublisher>Bundesanstalt für Materialforschung und -prüfung (BAM)</thesisPublisher>
    <file>https://opus4.kobv.de/opus4-bam/files/53884/Customizing New Titanium Dioxide Nanoparticles.pdf</file>
  </doc>
  <doc>
    <id>39145</id>
    <completedYear/>
    <publishedYear>2017</publishedYear>
    <thesisYearAccepted/>
    <language>eng</language>
    <pageFirst>Article 61, 1</pageFirst>
    <pageLast>16</pageLast>
    <pageNumber/>
    <edition/>
    <issue>2</issue>
    <volume>19</volume>
    <type>article</type>
    <publisherName>Springer Nature</publisherName>
    <publisherPlace/>
    <creatingCorporation/>
    <contributingCorporation/>
    <belongsToBibliography>1</belongsToBibliography>
    <completedDate>--</completedDate>
    <publishedDate>--</publishedDate>
    <thesisDateAccepted>--</thesisDateAccepted>
    <title language="eng">Reliable nanomaterial classification of powders using the volume-specific surface area method</title>
    <abstract language="eng">The volume-specific surface area (VSSA) of a particulate material is one of two apparently very different metrics recommended by the European Commission for a definition of "nanomaterial" for regulatory purposes: specifically, the VSSA metric may classify nanomaterials and non-nanomaterials differently than the median size in number metrics, depending on the chemical composition, size, polydispersity, shape, porosity, and aggregation of the particles in the powder.&#13;
Here we evaluate the extent of agreement between classification by electron microscopy (EM) and classification by VSSA on a large set of diverse particulate substances that represent all the anticipated challenges except mixtures of different substances. EM and VSSA are determined in multiple labs to assess also the level of reproducibility. Based on the results obtained on highly characterized benchmark materials from the&#13;
NanoDefine EU FP7 project, we derive a tiered screening strategy for the purpose of implementing the definition of nanomaterials. We finally apply the Screening strategy to further industrial materials, which were classified correctly and left only borderline cases for EM.&#13;
On platelet-shaped nanomaterials, VSSA is essential to prevent false-negative classification by EM. On porous materials, approaches involving extended Adsorption isotherms prevent false positive classification by VSSA. We find no false negatives by VSSA, neither in Tier 1 nor in Tier 2, despite real-world industrial polydispersity and diverse composition, shape, and coatings. The VSSA screening strategy is recommended for inclusion in a technical guidance for the implementation of the definition.</abstract>
    <parentTitle language="eng">Journal of Nanoparticle Research</parentTitle>
    <identifier type="doi">10.1007/s11051-017-3741-x</identifier>
    <identifier type="urn">urn:nbn:de:kobv:b43-391450</identifier>
    <identifier type="issn">1388-0764</identifier>
    <identifier type="issn">1572-896X</identifier>
    <enrichment key="date_peer_review">06.04.2017</enrichment>
    <licence>Creative Commons - Namensnennung 3.0</licence>
    <author>W. Wohlleben</author>
    <author>Johannes Mielke</author>
    <author>A. Bianchin</author>
    <author>A. Ghanem</author>
    <author>H. Freiberger</author>
    <author>H. Rauscher</author>
    <author>Marion Gemeinert</author>
    <author>Vasile-Dan Hodoroaba</author>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Nanomaterial</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Nanomaterial classification</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Regulation</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>VSSA</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Size measurement</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Particle size</value>
    </subject>
    <collection role="ddc" number="543">Analytische Chemie</collection>
    <collection role="literaturgattung" number="">Verlagsliteratur</collection>
    <collection role="fulltextaccess" number="">Datei für die Öffentlichkeit verfügbar ("Open Access")</collection>
    <collection role="unnumberedseries" number="">Wissenschaftliche Artikel der BAM</collection>
    <thesisPublisher>Bundesanstalt für Materialforschung und -prüfung (BAM)</thesisPublisher>
    <file>https://opus4.kobv.de/opus4-bam/files/39145/Wohlleben_Reliable nanomaterial classification of powders.pdf</file>
  </doc>
  <doc>
    <id>39095</id>
    <completedYear/>
    <publishedYear>2016</publishedYear>
    <thesisYearAccepted/>
    <language>eng</language>
    <pageFirst>10945</pageFirst>
    <pageLast>10952</pageLast>
    <pageNumber/>
    <edition/>
    <issue>12</issue>
    <volume>10</volume>
    <type>article</type>
    <publisherName>ACS Publications</publisherName>
    <publisherPlace/>
    <creatingCorporation/>
    <contributingCorporation/>
    <belongsToBibliography>1</belongsToBibliography>
    <completedDate>--</completedDate>
    <publishedDate>--</publishedDate>
    <thesisDateAccepted>--</thesisDateAccepted>
    <title language="eng">Light-Induced Translation of Motorized Molecules on a Surface</title>
    <abstract language="eng">Molecular machines are a key component in the vision of molecular nanotechnology and have the potential to transport molecular species and cargo on surfaces. The motion of such machines should be triggered remotely, ultimately allowing a large number of molecules to be propelled by a single source, with light being an attractive stimulus. Here, we report upon the photoinduced translation of molecular machines across a surface by characterizing single molecules before and after illumination. Illumination of molecules containing a motor unit results in an enhancement in the diffusion of the molecules. The effect vanishes if an incompatible photon energy is used or if the motor unit is removed from the molecule, revealing that the enhanced motion is due to the presence of the wavelength-sensitive motor in each molecule.</abstract>
    <parentTitle language="eng">ACS Nano</parentTitle>
    <identifier type="doi">10.1021/acsnano.6b05650</identifier>
    <identifier type="url">http://pubs.acs.org/doi/abs/10.1021/acsnano.6b05650</identifier>
    <enrichment key="date_peer_review">23.02.2017</enrichment>
    <author>A. Saywell</author>
    <author>A. Bakker</author>
    <author>Johannes Mielke</author>
    <author>T. Kumagai</author>
    <author>M. Wolf</author>
    <author>V. García-López</author>
    <author>P.-T. Chiang</author>
    <author>J. M. Tour</author>
    <author>L. Grill</author>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Diffusion</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Molecular devices</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Molecular motor</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Scanning probe microscopy</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Photoexcitation</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Photochemistry</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Molecular machines</value>
    </subject>
    <collection role="ddc" number="543">Analytische Chemie</collection>
    <collection role="literaturgattung" number="">Verlagsliteratur</collection>
    <collection role="fulltextaccess" number="">Datei im Netzwerk der BAM verfügbar ("Closed Access")</collection>
  </doc>
  <doc>
    <id>37177</id>
    <completedYear/>
    <publishedYear>2016</publishedYear>
    <thesisYearAccepted/>
    <language>eng</language>
    <pageFirst>035416-1</pageFirst>
    <pageLast>035416-7</pageLast>
    <pageNumber/>
    <edition/>
    <issue>3</issue>
    <volume>94</volume>
    <type>article</type>
    <publisherName>American Physical Society</publisherName>
    <publisherPlace/>
    <creatingCorporation/>
    <contributingCorporation/>
    <belongsToBibliography>1</belongsToBibliography>
    <completedDate>--</completedDate>
    <publishedDate>--</publishedDate>
    <thesisDateAccepted>--</thesisDateAccepted>
    <title language="eng">Observing single-atom diffusion at a molecule-metal interface</title>
    <abstract language="eng">The dynamics at the interface between a close-packed porphyrin monolayer and Au(111) is investigated by time-dependent scanning tunneling microscopy, detecting the motion of single-interface adatoms in real space. Imaging sequences reveal predominant switching of the molecular appearance in adjacent molecules, pointing to a spatial correlation that is consistent with adatom diffusion from one molecule to the next. In some cases, the number of switching molecules is drastically increased, indicating collective switching events. In addition to the thermally induced motion of adatoms at the interface, also voltage pulses from the microscope tip can induce the process—revealing different yields in agreement with the model of adatom hopping.</abstract>
    <parentTitle language="eng">Physical Review B</parentTitle>
    <identifier type="doi">10.1103/PhysRevB.94.035416</identifier>
    <identifier type="url">http://journals.aps.org/prb/abstract/10.1103/PhysRevB.94.035416</identifier>
    <enrichment key="date_peer_review">23.08.2016</enrichment>
    <author>Johannes Mielke</author>
    <author>J. Martınez-Blanco</author>
    <author>M. V. Peters</author>
    <author>S. Hecht</author>
    <author>L. Grill</author>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>STM</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>molecular switch</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>single molecule</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>switching dynamics</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>porphyrin</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Au(111)</value>
    </subject>
    <collection role="ddc" number="543">Analytische Chemie</collection>
    <collection role="literaturgattung" number="">Verlagsliteratur</collection>
    <collection role="fulltextaccess" number="">Datei im Netzwerk der BAM verfügbar ("Closed Access")</collection>
  </doc>
</export-example>
