Dresden 2014 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
CPP: Fachverband Chemische Physik und Polymerphysik
CPP 52: Biomaterials and Biopolymers (joint session with BP) II
CPP 52.13: Vortrag
Donnerstag, 3. April 2014, 18:30–18:45, ZEU 222
Unusual behavior of vapor deposited glasses of 1-pentene and ethylcyclohexane investigated by fast-scanning and AC chip nanocalorimetry — •Yeong Zen Chua1, Mathias Ahrenberg1, Christoph Schick1, Katherine Whitaker2, Michael Tylinski2, and Mark Ediger2 — 1Institute of Physics, University of Rostock, Rostock 18051, Germany — 2Department of Chemistry, University of Wisconsin, Madison, Wisconsin 53706, United States
Glasses produced by physical vapor deposition exhibit different densities and relaxation behaviors, depending upon the deposition conditions. Glasses deposited at temperatures of about 0.85 of glass transition temperature Tg, called stable glass, have low enthalpy, low heat capacity, high kinetic stability and high density, while glasses deposited at much lower temperatures than Tg have opposite properties. We have investigated the glasses of 1-pentene and ethylcyclohexane created from PVD in a wide range of deposition temperatures between 10 K and 120 K by fast-scanning and AC chip nanocalorimetry. Fast-scanning calorimetry provides information about the enthalpy of the deposited samples, while AC chip nanocalorimetry allows for a highly sensitive heat capacity measurement on the same samples.