TY - JOUR
A1 - Wolf, S. E.
A1 - Lieberwirth, I.
A1 - Natalio, F.
A1 - Bardeau, J.-F.
A1 - Delorme, N.
A1 - Emmerling, Franziska
A1 - Barrea, R.
A1 - Kappl, M.
A1 - Marin, F.
T1 - Merging models of biomineralisation with concepts of nonclassical crystallisation: is a liquid amorphous precursor involved in the formation of the prismatic layer of the Mediterranean Fan Mussel Pinna nobilis?
N2 - The calcitic prisms of Pinna nobilis (Pinnidae, Linnaeus 1758) are shown to be perfect examples of a mesocrystalline material. Based on their ultrastructure and on the occurrence of an amorphous transient precursor during the early stages of prism formation, we provide evidence for the pathway of mesocrystallisation proposed by Seto et al. (2012), which proceeds not by self-organized oriented attachment of crystalline nano-bricks but by aggregation of initially amorphous nanogranules which later transform by epitaxial nucleation to a three-dimensional array of well aligned nanocrystals. We further fathom the role of a liquid amorphous calcium carbonate in biomineralisation processes and provide strong evidence for the occurrence of PILP-like intermediates during prism formation. We develop a new scenario of prism formation based on the presented findings presented findings and discuss the implications of a speculative liquid amorphous calcium carbonate (LACC) intermediate in vivo.
PY - 2012
DO - https://doi.org/10.1039/c2fd20045g
SN - 1359-6640
SN - 1364-5498
VL - 159
IS - 0
SP - 433
EP - 448
PB - Soc.
CY - Cambridge [u.a.]
AN - OPUS4-27122
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - JOUR
A1 - Wolf, S. E.
A1 - Müller, L.
A1 - Barrea, R.
A1 - Kampf, C.J.
A1 - Leiterer, Jork
A1 - Panne, Ulrich
A1 - Hoffmann, T.
A1 - Emmerling, Franziska
A1 - Tremel, W.
T1 - Carbonate-coordinated metal complexes precede the formation of liquid amorphous mineral emulsions of divalent metal carbonates
N2 - During the mineralisation of metal carbonates MCO3 (M = Ca, Sr, Ba, Mn, Cd, Pb) liquid-like amorphous intermediates emerge. These intermediates that form via a liquid/liquid phase separation behave like a classical emulsion and are stabilized electrostatically. The occurrence of these intermediates is attributed to the formation of highly hydrated networks whose stability is mainly based on weak interactions and the variability of the metal-containing pre-critical clusters. Their existence and compositional freedom are evidenced by electrospray ionization mass spectrometry (ESI-MS). Liquid intermediates in non-classical crystallisation pathways seem to be more common than assumed.
PY - 2011
DO - https://doi.org/10.1039/c0nr00761g
SN - 2040-3364
SN - 2040-3372
IS - 3
SP - 1158
EP - 1165
PB - RSC Publ.
CY - Cambridge
AN - OPUS4-23355
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - JOUR
A1 - Wu, D.
A1 - Descalzo López, Ana Belén
A1 - Weik, F.
A1 - Emmerling, Franziska
A1 - Shen, Z.
A1 - You, X.-Z.
A1 - Rurack, Knut
T1 - Ein kernmodifiziertes Rubyrin mit meso-Aryl-Subsituenten und Phenanthren-anellierten Pyrrolringen als hoch konjugierter NIR-Farbstoff und Hg2+-Sonde
KW - Fluoreszenz
KW - NIR-Farbstoffe
KW - Porphyrinoide
KW - Quecksilber
KW - Sensoren
PY - 2008
DO - https://doi.org/10.1002/ange.200702854
SN - 0044-8249
SN - 0932-2140
SN - 1521-3757
VL - 120
IS - 1
SP - 199
EP - 203
PB - Wiley-VCH
CY - Weinheim
AN - OPUS4-16447
LA - deu
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - JOUR
A1 - Wu, D.
A1 - Descalzo López, Ana Belén
A1 - Weik, F.
A1 - Emmerling, Franziska
A1 - Shen, Z.
A1 - You, X.-Z.
A1 - Rurack, Knut
T1 - A core-modified Rubyrin with meso-aryl substituents and phenanthrene-fused pyrrole rings: a highly conjugated near-infrared dye and Hg2+ probe
KW - Fluorescence
KW - Mercury
KW - NIR dyes
KW - Porphyrinoids
KW - Sensors
PY - 2008
DO - https://doi.org/10.1002/Anie.200702854
SN - 1433-7851
SN - 1521-3773
SN - 0570-0833
VL - 47
IS - 1
SP - 193
EP - 197
PB - Wiley-VCH
CY - Weinheim
AN - OPUS4-16448
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - JOUR
A1 - Wuithschick, M.
A1 - Paul, B.
A1 - Bienert, Ralf
A1 - Sarfraz, A.
A1 - Vainio, U.
A1 - Sztucki, M.
A1 - Kraehnert, R.
A1 - Strasser, P.
A1 - Rademann, K.
A1 - Emmerling, Franziska
A1 - Polte, J.
T1 - Size-controlled synthesis of colloidal silver nanoparticles based on mechanistic understanding
N2 - Metal nanoparticles have attracted much attention due to their unique properties. Size control provides an effective key to an accurate adjustment of colloidal properties. The common approach to size control is testing different sets of parameters via trial and error. The actual particle growth mechanisms, and in particular the influences of synthesis parameters on the growth process, remain a black box. As a result, precise size control is rarely achieved for most metal nanoparticles. This contribution presents an approach to size control that is based on mechanistic knowledge. It is exemplified for a common silver nanoparticle synthesis, namely, the reduction of AgClO4 with NaBH4. Conducting this approach allowed a well-directed modification of this synthesis that enables, for the first time, the size-controlled production of silver nanoparticles 4–8 nm in radius without addition of any stabilization agent.
KW - Silver nanoparticles
KW - Growth mechanism
KW - SAXS
KW - Size control
KW - Sodium borohydride
PY - 2013
DO - https://doi.org/10.1021/cm401851g
SN - 0897-4756
SN - 1520-5002
VL - 25
IS - 23
SP - 4679
EP - 4689
PB - American Chemical Society
CY - Washington, DC
AN - OPUS4-30194
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - JOUR
A1 - Yusenko, Kirill
A1 - Kabelitz, Anke
A1 - Schokel, Alexander
A1 - Wagner, Ralf
A1 - Prinz, Carsten
A1 - Kemnitz, E
A1 - Emmerling, Franziska
A1 - Krahl, Thoralf
A1 - de Oliveira Guilherme Buzanich, Ana
T1 - Local Structure of Europium-Doped Luminescent Strontium Fluoride Nanoparticles: Comparative X-ray Absorption Spectroscopy and Diffraction Study
N2 - Rare-earth based luminescent materials are key functional components for the rational design of light-conversion smart devices. Stable Eu3+-doped strontium fluoride (SrF2) nanoparticles were prepared at room temperature in ethylene glycol. Their luminescence depends on the Eu content and changes after heat treatment. The crystallinity of heat-treated material increases in comparison with as-synthesized samples. Particles were investigated in solution using X-ray diffraction, small-angle X-ray scattering, and X-ray spectroscopy. After heat treatment, the size of the disordered nanoparticles increases together with a change of their local structure. Interstitial fluoride ions can be localized near Eu3+ ions. Therefore, non-radiative relaxation from other mechanisms is decreased. Knowledge about the cation distribution is key information for understanding the luminescence properties of any material.
KW - SrF2
KW - EXAFS
KW - Eu
PY - 2021
UR - https://nbn-resolving.org/urn:nbn:de:kobv:b43-540094
DO - https://doi.org/10.1002/cnma.202100281
VL - 7
IS - 11
SP - 1221
EP - 1229
PB - Wiley Online Library
AN - OPUS4-54009
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - JOUR
A1 - Zauer, M.
A1 - Prinz, Carsten
A1 - Adolphs, J.
A1 - Emmerling, Franziska
A1 - Wagenführ, A.
T1 - Sorption surfaces and energies of untreated and thermally modified wood evaluated by means of excess surface work (ESW)
N2 - Water vapor sorption surface areas and sorption energies of untreated
and thermally modified Norway spruce [Picea abies (L.) Karst.], sycamore maple (Acer pseudoplatanus L.) and European ash (Fraxinus excelcior L.) were investigated by means of dynamic vapor sorption (DVS) measurements and excess surface work (ESW) evaluation method, respectively. Adsorption and desorption experiments in the hygroscopic range and desorption tests from water saturation were conducted.
Thermodynamically, ESW is the sum of the surface free energy and the isothermal isobaric work of sorption. From the amount adsorbed in the first Minimum a specific surface area similar to the BET surface area can be obtained. The results show that untreated spruce has a significantly higher specific water vapor Sorption surface and sorption energy compared to both hardwoods maple and ash. Thermal modification of the woods leads to a significant reduction of water vapor Sorption surface and sorption energy. The determined surface area and energy are higher in desorption direction than in adsorption direction, whereby the highest values in Desorption direction from water saturation, especially for maple and ash, were obtained.
The surface areas calculated by means of the ESW method are similar to the surface areas calculated by means of the BET method, particularly in adsorption direction.
KW - Excess surface work
KW - Dynamic vapor sorption
KW - Wood
KW - BET
PY - 2018
DO - https://doi.org/10.1007/s00226-018-1021-2
SN - 1432-5225
SN - 0043-7719
VL - 52
IS - 4
SP - 957
EP - 969
PB - Springer
CY - Berlin Heidelberg
AN - OPUS4-44975
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - JOUR
A1 - Zink, N.
A1 - Emmerling, Franziska
A1 - Häger, T.
A1 - Panthöfer, M.
A1 - Tahir, M.N.
A1 - Kolb, U.
A1 - Tremel, W.
T1 - Low temperature synthesis of monodisperse nanoscaled ZrO2 with a large specific surface area
N2 - Thermal decomposition of Zr(C2O4)2·4H2O within an autoclave or in a conventional tube furnace at temperatures below 380 °C resulted in nano- and micron-sized ZrO2, respectively. Reactions under autogenic pressure yielded monodisperse monoclinic (m) and tetragonal (t) ZrO2 nanoparticles with an average diameter of ~8 nm and interconnected t-ZrO2 nanoparticles with diameters of ~4 nm, depending on the synthesis temperature. Samples were characterised by X-ray diffraction (XRD), small angle X-ray scattering (SAXS), scanning electron microscopy (SEM), transmission electron microscopy (TEM) associated with energy dispersive X-ray spectroscopy (EDS), Raman microspectroscopy and photoluminescence spectroscopy (PL). Nanostructured zirconia materials exhibited high specific areas of 276–385 m2 g-1 which make them promising candidates as catalysts and catalyst supports. Co-existence of m- and t-ZrO2 nanoparticles with diameters of 6–9 nm, i.e. above the critical particle size of 6 nm for the formation of t-ZrO2, demonstrated that the particle size is not the only factor for stabilisation of the t-ZrO2 modification at room temperature.
PY - 2013
DO - https://doi.org/10.1039/c2dt12496c
SN - 1477-9226
SN - 1477-9234
SN - 1364-5447
VL - 42
SP - 432
EP - 440
PB - RSC
CY - Cambridge
AN - OPUS4-27733
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - JOUR
A1 - Zuffa, Caterina
A1 - Cappuccino, Chiara
A1 - Casali, Lucia
A1 - Emmerling, Franziska
A1 - Maini, Lucia
T1 - Liquid reagents are not enough for liquid assisted grinding in the synthesis of (AgBr)(n-pica) n
N2 - This study investigates the mechanochemical reactions between AgBr 3-picolylamine and 4-picolylamine. The use of different stoichiometry ratios of the reagents allows [(AgBr)(n-pica)]n and [(AgBr)2(n-pica)]n to be obtained, and we report the new structures of [(AgBr)2(3-pica)]n and [(AgBr)2(4-pica)]n which are characterized by the presence of the following: (a) infinite inorganic chains, (b) silver atom coordinated only by bromide atoms and (c) argentophilic interactions. Furthermore, we studied the interconversion of [(AgBr)(n-pica)]n/[(AgBr)2(n-pica)]n by mechanochemical and thermal properties. The in situ experiments suggest that [(AgBr)(3-pica)]n is kinetically favoured while [(AgBr)2(3-pica)]n is converted into [(AgBr)(3-pica)]n only with a high excess of the ligand. Finally, the liquid nature of the ligands is not sufficient to assist the grinding process, and the complete reaction is observed with the addition of a small quantity of acetonitrile.
KW - Mechanochemistry
KW - Complex
PY - 2024
UR - https://nbn-resolving.org/urn:nbn:de:kobv:b43-594755
DO - https://doi.org/10.1039/d3cp04791a
SN - 1463-9076
SP - 1
EP - 10
PB - Royal Society of Chemistry (RSC)
AN - OPUS4-59475
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - JOUR
A1 - Zänker, Steffen
A1 - Scholz, G.
A1 - Heise, M.
A1 - Kemnitz, E.
A1 - Emmerling, Franziska
T1 - New 2D layered structures with direct fluorine-metal bonds: MF(CH3COO) (M: Sr, Ba, Pb)
N2 - New coordination polymers with 2D network structures with fluorine directly coordinated to the metal ion were prepared both via mechanochemical synthesis and fluorolytic sol–gel synthesis. Depending on the synthesis route, the samples show different particle sizes, according to SEM imaging. The crystal structures of barium acetate fluoride, strontium acetate fluoride, and lead acetate fluoride (BaFIJCH3COO), SrFIJCH3COO) and PbFIJCH3COO)) were solved from X-ray powder diffraction data. The structure solution is backed by the results from 19F MAS NMR, FT IR data, and thermal analysis. The calculated chemical shifts of the 19F MAS NMR spectra coincide well with the measured ones. It turns out that the grinding conditions have a remarkable influence on the mechanochemical synthesis and its products. Our systematic study also indicates a strong influence of the atomic radii of Ca, Sr, Ba, and Pb on the success of the syntheses.
KW - Mechanochemistry
KW - Coordination polymers
PY - 2020
DO - https://doi.org/10.1039/d0ce00287a
VL - 22
IS - 16
SP - 2772
EP - 2780
PB - Royal Society of Chemistry
AN - OPUS4-50789
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -