Direct observation of molecular cooperativity near the glass transition

Details Direct observation of molecular cooperativity near the glass transition Direct observation of molecular cooperativity near the glass transition

2000-12-13

arxiv.org/abs/cond-mat/0012245v1

Nature 408, 695 (2000)

Physics

Condensed Matter

Disordered Systems and Neural Networks

14 pages pdf, need Acrobat Reader

Scientific paper

We describe direct observations of molecular cooperativity near the glass transition in poly-vinyl-acetate (PVAc), through nanometer-scale probing of dielectric fluctuations. Molecular clusters switched spontaneously between two to four distinct configurations, producing complex random-telegraph-signals (RTS). Analysis of the RTS and their power spectra shows that individual clusters exhibit both transient dynamical heterogeneity and non-exponential kinetics.

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