TY - CONF A1 - Emmerling, Franziska T1 - SOLVENT TRIGGERED CRYSTALLIZATION OF POLYMORPHS STUDIED IN SITU BY XRD AND RAMAN SPECTROSCOPY T2 - 8th Bologna's Convention on Crystal Forms: Crystals in Food & Pharma 2015 CY - Bologna, Italien DA - 2015-06-14 PY - 2015 AN - OPUS4-33953 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Emmerling, Franziska T1 - Direct in situ analysis of milling reactions for mechanistic studies using X-ray diffraction combined with Raman spectroscopy T2 - GDCh Wissenschaftsforum CY - Dresden DA - 2015-08-30 PY - 2015 AN - OPUS4-33947 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Bhattacharya, Biswajit A1 - Akhmetova, Irina A1 - Rautenberg, Max A1 - Emmerling, Franziska T1 - Mechanochemical synthesis of phosphonate-based proton conducting metal organic frameworks and hydrogen-bonded metal phosphonates N2 - Proton exchange membrane fuel cells (PEMFCs) are one of the most promising alternative green energy technologies that deliver high energy density without CO2 emissions. The proton conductivity of proton exchange membranes (PEM) contributes to the overall efficiency of a PEMFC. Materials being used as PEMs must exhibit high proton conductivity at the working conditions of the targeted PEMFC. To date, Nafion and Nafion-like polymers with acidic functionality are widely used as membrane materials due to their high proton conductivity in the range of 10-1 to 10-2 Scm-1 at higher relative humidity. However, these materials suffer from high costs, hazardous production process, and poor performance at high temperatures, limiting their versatility. In this context, crystalline porous materials are recognized as promising proton conductors for the proton exchange membrane (PEM) in fuel cell technology, owing to their tunable framework structure. However, it is still challenging bulk synthesis for real-world applications of these materials. Herein, we present mechanochemical gram-scale synthesis of series of mixed ligand metal organic frameworks (MOFs) and metal hydrogen‐bonded organic frameworks (MHOFs) using phenylene diphosphonic acid and 1-hydroxyethylidene-1,1-diphosphonic acid with different bipyridyl type of ligands, respectively. In all cases, the existence of extensive hydrogen bonds with amphiprotic uncoordinated phosphonate hydroxyl and oxygen atoms, the frameworks exhibited high proton conductivity. The study demonstrates the potential of green mechanosynthesis for preparations of framework-based proton conducting materials in bulk scale for green energy generation. T2 - 4th International Conference on Phosphonate Chemistry, Science and Technology, ICOPHOS-4 CY - Crete, Greece DA - 02.10.2023 KW - Proton exchange membrane fuel cells KW - Metal organic frameworks KW - Proton conducting materials PY - 2023 AN - OPUS4-58837 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Emmerling, Franziska T1 - In situ investigations of mechanochemical reactions - new insights in formation pathways N2 - Mechanochemistry is increasingly used for synthesizing soft matter materials including metal organic compounds and cocrystals. The ever-increasing interest in this method is contrasted by a limited mechanistic understanding of the mechanochemical reactivity and selectivity. Time-resolved in situ investigations of milling reactions provide direct insights in the underlying mechanisms. We recently introduced a setup enabling in situ investigation of mechanochemical reactions using synchrotron XRD combined with Raman spectroscopy. The specific combination allows to study milling processes comprehensively on the level of the molecular and crystalline structure and thus obtaining reliable data for mechanistic studies. In situ Raman spectroscopy coupled with thermography revealed a low temperature increase during milling reactions due to the mechanical impact and clear temperature increases because of the reaction heat. Based on the data, temperature rises as postulated in the magma plasma and hot spot theory can be excluded for soft matter milling syntheses. Our results indicate that in situ investigation of milling reactions offer a new approach to tune and optimize mechanochemically synthesized compounds. T2 - Wissenschaftsforum Chemie CY - Berlin, Germany DA - 10.09.17 KW - Mechanochemistry KW - In situ PY - 2017 AN - OPUS4-43563 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Emmerling, Franziska T1 - Coordination of U(IV) sulfate in aqueous solution of high ionic strength and in solid state T2 - Jahrestagung der Deutschen Gesellschaft für Kristallographie CY - Erlangen, Germany DA - 2008-03-03 PY - 2008 AN - OPUS4-18726 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Emmerling, Franziska T1 - Contact-free Formation of Calcium Carbonate in a Levitated Drop: a WAXS / TEM study T2 - Jahrestagung der Deutschen Gesellschaft für Kristallographie CY - Erlangen, Germany DA - 2008-03-03 PY - 2008 AN - OPUS4-18729 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Klobes, Peter A1 - Klimakow, Maria A1 - Emmerling, Franziska T1 - Gas adsorption and SAXS studies of mechanochemically prepared Cu3 (BTC)2 T2 - CPM-5 - 5th - International Workshop "Characterization of Porous Materials: from Angstroms to Millimeters", New Brunswick, NJ, USA CY - New Brunswick, NJ, USA DA - 2009-06-24 PY - 2009 AN - OPUS4-18713 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Emmerling, Franziska T1 - Coordination of the limiting U (IV) carbonate species in aqueous solution - a comparative EXAFS and XRD investigation T2 - DGK Tagung (Deutsche Gesellschaft für Kristallographie) CY - Hanover, Germany DA - 2009-03-09 PY - 2009 AN - OPUS4-18718 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Emmerling, Franziska T1 - New experimental setup for on-line monitoring of mixed oxide catalyst synthesis at the µ-Spot Beamline at BESSY II T2 - 18th Users' Meeting at the ESRF CY - Grenoble, France DA - 2008-02-05 PY - 2008 AN - OPUS4-17849 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Emmerling, Franziska T1 - Monitoring von Katalysatorsynthesen mittels simultaner WAXS/SAXS/Raman- und ATR/UV-vis/Raman-Spektroskopie T2 - ProcessNet-Jahrestagung 2008 CY - Karlsruhe, Germany DA - 2008-10-07 PY - 2008 AN - OPUS4-17835 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER -