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Nanometer Scale Dielectric Fluctuations at the Glass Transition

E. Vidal Russell·N. E. Israeloff·L. E. Walther·H. Alvarez Gomariz
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Abstract

Using non-contact scanning probe microscopy (SPM) techniques, dielectric properties were studied on 50 nanometer length scales in poly-vinyl-acetate (PVAc) films in the vicinity of the glass transition. Low frequency (1/f) noise observed in the measurements, was shown to arise from thermal fluctuations of the electric polarization. Anomalous variations observed in the noise spectrum provide direct evidence for cooperative nano-regions with heterogeneous kinetics. The cooperative length scale was determined. Heterogeneity was long-lived only well below the glass transition for faster than average processes.

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E. Vidal Russell, N. E. Israeloff, L. E. Walther, H. Alvarez Gomariz. 1998-07-08. Nanometer Scale Dielectric Fluctuations at the Glass Transition. https://doi.org/10.1103/physrevlett.81.1461

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