TY - CONF A1 - Schönhals, Andreas T1 - Broadband Dielectric Spetroskopy and its Application to Dynamic Glass Transition T2 - Frühjahrsschule "Festkörperphysik" der Universität Karlsruhe (eingeladene Vortrag) CY - Karlsruhe, Germany DA - 2003-02-17 PY - 2003 AN - OPUS4-4110 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Schönhals, Andreas T1 - Polar Molecules in Nanoconfinements T2 - Vortrag Universität Lyon CY - Lyon, France DA - 2003-03-31 PY - 2003 AN - OPUS4-4111 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Schönhals, Andreas T1 - Polymere in Nano-Confinements: Vergleich von Relaxationsexperimenten und (Neutronen) streuung T2 - Kolloquium der Abteilung VI CY - Berlin, Germany DA - 2003-06-05 PY - 2003 AN - OPUS4-4113 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Schönhals, Andreas T1 - Inverse Nanocomposites: Structure and Dynamics of Polymers Confined to Nanopores T2 - 7th International Symposium Polymers for Advanced Technologies CY - Fort Lauderdale, FL, USA DA - 2003-09-21 PY - 2003 AN - OPUS4-4191 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Schönhals, Andreas T1 - Polymers confined to nanoporous glasses: What can we leam from relaxation and scattering experiments? T2 - Softmatter Seminar des Forschungszentrums Jülich CY - Jülich, Germany DA - 2003-11-13 PY - 2003 AN - OPUS4-4192 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Schönhals, Andreas T1 - Polymers in Random Nanoporous glasses: Molecular Dynamics and Structure T2 - Fall meeting Material Researsh Society of America CY - Boston, MA, USA DA - 2003-12-01 PY - 2003 AN - OPUS4-4193 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Schönhals, Andreas T1 - Polymere in nanoporösen Gläsern: Was können wir von Relaxations- und Streuexperimenten lernen? T2 - Workshop Glasübergang CY - Berlin, Germany DA - 2003-12-14 PY - 2003 AN - OPUS4-4196 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Schönhals, Andreas T1 - Rotational fluctuations of water inside nanopores/nanocavities of molecular sieves T2 - Workshop Confit 2006 CY - Grenoble, France DA - 2006-03-23 PY - 2006 AN - OPUS4-12015 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Schönhals, Andreas T1 - Polymers confined to nanoporous glasses investigated by quasielastic and inelastic neutron scattering T2 - Workshop Confit 2006 CY - Grenoble, France DA - 2006-03-23 PY - 2006 AN - OPUS4-12000 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Schönhals, Andreas T1 - Molecular fluctuations of 4-n-octyl-4'cyanobiphenyl confined to nanoporous SBA-type molecular sieves with different filling degrees T2 - Workshop Confit 2006 CY - Grenoble, France DA - 2006-03-23 PY - 2006 AN - OPUS4-12005 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Schönhals, Andreas T1 - Neutron spectroscopy on polymers confined to nanoporous glasses T2 - Frühjahrstagung der Deutschen Physikalischen Gesellschaft CY - Dresden, Germany DA - 2006-03-21 PY - 2006 AN - OPUS4-12032 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Frunza, Ligia A1 - Kosslick, H. A1 - Frunza, Stefan A1 - Schönhals, Andreas T1 - Molecular dynamics of 4-n-octyl-4'-cyanobiphenyl in partially filled nanoporous SBA-type molecular sieves N2 - The molecular dynamics of 4-n-octyl-4'-cyanobiphenyl (8CB) confined to the nanopores of new SBA-type molecular sieves was investigated in a wide temperature range using broadband dielectric spectroscopy (10-2–109 Hz). One molecular sieve has a hexagonal structure of the pores while the other is a cellular nanoporous material. To explore the extent of surface interaction effects a high and a low filling degree were considered. For the molecular sieves with a high filling degree two relaxation regions were observed: a bulk-like relaxation process related to molecules, which behave as mesophase, located in the centre of the pores. The second relaxation process has a much lower relaxation rate than the former and is assigned to molecules located in a surface layer. The temperature dependence of its relaxation rates follows the Vogel–Fulcher–Tammann law, characteristic for glassy dynamics. For samples with a low filling degree only one relaxation process due to the surface layer was observed. Moreover, especially at the temperatures lower than the melting point of bulk 8CB, its relaxation rate is situated between the characteristic frequencies of the two relaxation processes observed for the pores with a high filling degree. This behaviour gives a measure of the extension of the influence of the wall on the neighbouring 8CB molecules. In addition, the differences revealed by the molecule dynamics inside the two types of nanoporous materials are related to both surface interactions and geometrical constraints. KW - Confined liquid crystals KW - Molecular sieves KW - Dielectric measurements KW - Relaxation processes KW - Glassy dynamics PY - 2006 DO - https://doi.org/10.1016/j.micromeso.2005.10.025 SN - 1387-1811 SN - 1873-3093 VL - 90 IS - 1-3 SP - 259 EP - 270 PB - Elsevier CY - Amsterdam AN - OPUS4-12118 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Schönhals, Andreas A1 - Goering, Harald A1 - Schick, C. T1 - Poly(methyl phenyl siloxane) in Random Nanoporous Glasses - Comparison of coated and uncoated confining surfaces T2 - Poly(methyl phenyl siloxane) in Random Nanoporous Glasses: Comparison of coated and uncoated confining surfaces CY - Boston, MA, USA DA - 2006-11-28 PY - 2006 VL - 899E SP - 0899-N09-05.1-0899-N09-05.6 CY - Boston AN - OPUS4-12214 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Schönhals, Andreas T1 - Structure property relationships of different polymer based nanocomposites as investigated by dieletric spectroscopy and gas transport measurements T2 - 2nd International Symposium on Nanostructured and Functional Polymer-based Materials and Nanocomposites (NANOFUN-POLY) CY - Lyon, France DA - 2006-05-29 PY - 2006 AN - OPUS4-12393 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Schönhals, Andreas T1 - Polymer based nanocomposites as investigated by dielectric spectroscopy, gas transport measurements and related techniques T2 - NoE Nanofun Polymer, 6. FP der EU CY - Poznan, Poland DA - 2006-09-01 PY - 2006 AN - OPUS4-12625 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Schönhals, Andreas T1 - Polymers confined to Nanoporous Glasses T2 - Vortrag am National Research Center, Kairo CY - Cairo, Egypt DA - 2005-10-16 PY - 2005 AN - OPUS4-11669 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Schönhals, Andreas T1 - Polymers in Random Nanoporous Glasses Investigated by Dielectric, Thermal and Neutron Spectroscopy T2 - Herbst Meeting der Amerikanischen Gesellschaft für Materialforschung, 01.12. CY - Boston, MA, USA DA - 2005-11-27 PY - 2005 AN - OPUS4-11708 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Schönhals, Andreas T1 - Molecules in nanometre confinement investigated by dieletric spectroscopy and related techniques T2 - 4. Conference of the International Dieletric Society CY - Poznan, Poland DA - 2006-09-03 PY - 2006 AN - OPUS4-13042 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Schick, C. A1 - Sukhorukov, D. A1 - Schönhals, Andreas T1 - Comparison of the Molecular Dynamics of a Liquid Crystalline Side Group Polymer Revealed from Temperature Modulated DSC and Dielectric Experiments in the Glass Transition Region N2 - Temperature modulated DSC (TMDSC) in the frequency range from 10-3 Hz to 3.4 10-2 Hz and dielectric spectroscopy in the frequency range from 10-2 Hz to 106 Hz is employed to analyze the temperature dependence of the relaxation rates of the - and of the -relaxation of a liquid crystalline polymethacrylate having a derivative of (p-alkoxy-phenyl)-benzoate as mesogenic unit in the side group. Especially the molecular assignment of the -relaxation was discussed controversial in the literature up to now. By applying a temperature derivative method it was found that the temperature dependencies of the relaxation rates of the dielectric -relaxation and of the dynamic glass transition measured by TMDSC can be described by Vogel/Fulcher/Tammann laws with the same Vogel temperature. Therefore it is argued that the dielectric -relaxation of liquid crystalline polymers is rather due to the dynamic glass transition related to the segmental dynamics of the backbone than to the transverse dipole component of the mesogenic unit. PY - 2001 DO - https://doi.org/10.1002/1521-3935(20010501)202:8<1398::AID-MACP1398>3.0.CO;2-C SN - 1022-1352 SN - 1521-3935 VL - 202 IS - 8 SP - 1398 EP - 1404 PB - Wiley-VCH Verl. CY - Weinheim AN - OPUS4-13693 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Schönhals, Andreas T1 - Polymers confined to nanoporous glasses investigated by quasielastic and inelastic neutron scattering T2 - Soft Matter User Meeting CY - Grenoble, France DA - 2006-11-22 PY - 2006 AN - OPUS4-13881 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Schönhals, Andreas T1 - Polymers in nanoconfinements investigated by various spectroscopic methods T2 - Department of Physics and Astronomy, Universität Leuven CY - Leuven, Belgium DA - 2006-11-30 PY - 2006 AN - OPUS4-14203 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER -