TY - RPRT A1 - Ebert, H.-P. A1 - Reichenauer, G. A1 - Brandt, R. A1 - Braxmeier, S. A1 - Bauer, T. A1 - Tamme, R. A1 - Langer, W. A1 - Hudler, B. A1 - Christ, M. A1 - Sextl, G. A1 - Müller, G. A1 - Helbig, U. A1 - Houbertz, R. A1 - Voigt, W. A1 - Schmidt, H. A1 - Zehl, T. A1 - Mach, Reinhard A1 - Maneck, Heinz-Eberhard A1 - Meyer-Plath, Asmus A1 - Oleszak, Franz A1 - Keuper, M. A1 - Reisert, M. A1 - Burkhardt, H. A1 - Günther, E. A1 - Mehling, H. T1 - Netzwerk zur Überwindung grundlegender Probleme bei der Entwicklung hocheffizienter Latentwärmespeicher auf Basis anorganischer Speichermaterialien KW - Latentwärmespeicher KW - Materialforschung KW - Plasmaverfahren KW - Graphit PY - 2008 SN - 978-3-00-024699-9 SP - 1 EP - 217 CY - Würzburg AN - OPUS4-18273 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Meyer-Plath, Asmus A1 - Mach, Reinhard A1 - Maneck, Heinz-Eberhard A1 - Oleszak, Franz A1 - Friedrich, Jörg Florian T1 - Plasma-chemical functionalization of expanded graphite T2 - International Conference on Carbon (Carbon 2008) CY - Nagano, Japan DA - 2008-06-13 KW - Gas Discharge Plasma KW - Expanded Graphite KW - Functionalization KW - Surface Chemistry PY - 2008 SP - 1 EP - 5 AN - OPUS4-18339 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Friedrich, Jörg Florian A1 - Wettmarshausen, Sascha A1 - Hanelt, Sven A1 - Mach, Reinhard A1 - Mix, Renate A1 - Zeynalov, Eldar A1 - Meyer-Plath, Asmus T1 - Plasma-chemical bromination of graphitic materials and its use for subsequent functionalization and grafting of organic molecules N2 - Plasma-chemical bromination has been shown to be well-suited for highly selective and efficient C–Br-functionalization of polyolefin surfaces and has now been applied to graphitic materials, including highly oriented pyrolytic graphite (HOPG), natural graphite, carbon nanotubes, and graphitized carbon fibres. In contrast to the radical substitution of hydrogen by bromine at hydrogen-terminated sp3-hybridized carbon, bromination of all-carbon bound sp2-hybridized carbon in graphene requires addition to aromatic double bonds. The related change of sp2 to sp3 hybridization of the carbon atoms involved helps to explain experimental results of a loss in surface planarity on brominated HOPG. Bromine concentrations of up to 50 bromine atoms per 100 C-atoms were achieved in elemental bromine vapour under low-pressure plasma conditions using low-energetic inductively coupled radio-frequency plasma excitation. The time scale of the bromination progress was found to increase with the specific surface area of the material. The results of plasma-chemical bromination are compared to that of wet-chemical electrophilic addition reactions, which achieved 28 Br per 100 C for MWCNT. The resulting C–Br bonds from plasma-chemical processing of graphitic materials were shown to be well-suited for hydroxyl functionalization and for grafting of organic molecules by nucleophilic substitution with 1,6-diaminohexane and (3-aminopropyl)triethoxysilane. PY - 2010 DO - https://doi.org/10.1016/j.carbon.2010.06.054 SN - 0008-6223 SN - 1873-3891 VL - 48 IS - 13 SP - 3884 EP - 3894 PB - Pergamon Press CY - New York, NY AN - OPUS4-21954 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Mach, Reinhard T1 - Thermisch induzierte Morphologieänderung von SiCN-Nanopulvern T2 - GEFTA 2003 Thermische Analyse und Kalorimetrie CY - Augsburg, Germany DA - 2003-09-15 PY - 2003 AN - OPUS4-4677 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Mach, Reinhard T1 - Effects of Heat Treatment on the Structure of Thermal Plasma Synthesized SiCN Composite Nanopowders T2 - Nanomaterials und Nanotechnologies (NN 2003) CY - Crete, Greece DA - 2003-08-30 PY - 2003 AN - OPUS4-4645 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Mach, Reinhard A1 - Letzig, U. A1 - Goering, Harald A1 - Oleszak, Franz A1 - Friedrich, Jörg Florian A1 - Richter, K. T1 - Effects of Heat Treatment on the Structure of Thermal Plasma Synthesized SiCN Composite Nanopowders N2 - SiCN composite nanopowders with different chemical composition and characteristics were synthesized by the RF induction plasma at atmospheric pressure. Frequently the as-produced powders exhibit a high degree of chemical disorder or structural defects. Because the composition and the microstructure of starting powders have a great influence on the properties of composite ceramics, the changes of chemical composition, crystallization, and morphology of the as-produced powders during heat treatment up to 1500 °C were investigated in detail. PY - 2003 UR - http://www.ipme.ru/e-journals/RAMS/no_1503/tai/tai.html SN - 1606-5131 VL - 5 IS - 1 SP - 85 EP - 90 PB - Advanced Study Center CY - St. Petersburg AN - OPUS4-6968 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Mach, Reinhard A1 - Maneck, Heinz-Eberhard T1 - Modification of graphite particles in the RF induction plasma T2 - 12. Bundesdeutsche Fachtagung Plasmatechnologie CY - Braunschweig, Germany DA - 2005-03-21 PY - 2005 AN - OPUS4-7326 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Mach, Reinhard T1 - Synthese von SiCN-Komposit-, SiC- und Si3N4-Nanopulvern im RF-Induktionsplasma T2 - 12. Bundesdeutsche Fachtagung Plasmatechnologie CY - Braunschweig, Germany DA - 2005-03-21 PY - 2005 AN - OPUS4-7268 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Mach, Reinhard T1 - Annealing of plasma synthesized SiCN composite nanopowders T2 - 12. Bundesdeutsche Fachtagung Plasmatechnologie CY - Braunschweig, Germany DA - 2005-03-21 PY - 2005 AN - OPUS4-7290 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Goering, Harald A1 - Maneck, Heinz-Eberhard A1 - Mach, Reinhard A1 - Knoll, Uta A1 - Oleszak, Franz A1 - Gajewski, Sven A1 - Brzezinka, Klaus-Werner T1 - Synthese von Nano-Materialien - Fullerene, Kohlenstoff-Nanoröhren, Nanopulver und Schichten T2 - Materialica 2002 ; 5. Internationale Fachmesse für Werkstoffanwendungen, Oberflächen und Product Engineering CY - München, Deutschland DA - 2002-09-30 PY - 2002 SP - 1 EP - 2 AN - OPUS4-2059 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Gajewski, Sven A1 - Maneck, Heinz-Eberhard A1 - Knoll, Uta A1 - Neubert, Dietmar A1 - Dörfel, Ilona A1 - Mach, Reinhard A1 - Strauß, Birgid A1 - Friedrich, Jörg Florian T1 - Purification of single walled carbon nanotubes by thermal gas phase oxidation N2 - Single walled carbon nanotubes (SWNT) have been produced in an electric arc discharge by using a graphite rod as anode which is filled with a powder mixture of graphite and metallic catalysts like nickel and yttrium. The soot material containing approximately a third of SWNT was collected from the cathode region as a soft, voluminous material. The main by-products in this process are amorphous carbon and graphitic nanoparticles which have to be removed by an appropriate purification process. The as-produced soot material was purified by gas phase oxidation in air at 355 °C. The oxidation of amorphous carbon in air is advantageous against wet chemical methods because it is better controllable. Thermogravimetric analysis and electron microscopy were used to investigate the oxidation behavior of the different kinds of carbon. Oxidation of SWNT and amorphous carbon occurs simultaneously even at moderate temperatures, whereas amorphous carbon is more rapidly oxidized than SWNT. For optimizing the purification procedure by gas phase oxidation, kinetic studies were used to determine the oxidation time for each component in the soot at a given temperature. So it is possible to remove the amorphous carbon quantitatively with minimal losses of SWNT. But it was found that graphitic nanoparticles have the highest stability against oxidation and could therefore not be quantitatively removed by this method without the complete destruction of SWNT. Therefore, the electric arc discharge process has to be a controlled process for minimum production of graphitic nanoparticles to obtain a material with a high content of SWNT. KW - Nanotubes KW - Cathodic arc discharge KW - Amorphous carbon KW - Oxidation PY - 2003 DO - https://doi.org/10.1016/S0925-9635(02)00362-X SN - 0925-9635 VL - 12 IS - 3-7 SP - 816 EP - 820 PB - Elsevier CY - New York, NY AN - OPUS4-2516 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER -