Berlin 2012 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 14: Poster: Glasses I (jointly with DY)

CPP 14.10: Poster

Dienstag, 27. März 2012, 18:15–20:15, Poster A

Dielectric relaxation of alcohols in silica nanochannels — •Daniel Rau, Carsten Biehl, Rene Berwanger, and Rolf Pelster — Experimentalphysik, Universität des Saarlandes

We studied the molecular dynamics and glass transition of n-butanol and 2-ethyl-1-hexanol confined in silica nanochannels using broadband dielectric spectroscopy. For this purpose we have varied the pore radii in the range from 3 to 7 nm[1]. In contrast to the bulk material, confined n-butanol exhibits a glass transition upon slow cooling. Interestingly, in larger pores partial recristallization occurs upon heating. This behaviour reflects the different temperature dependence of nucleation and crystal growth.

[1] Berwanger et al., Eur. Phys. J. Special Topics 189, 239-249 (2010)