Nonergodicity and light scattering from polymer gels

J. Z. Xue; D. J. Pine; S. T. Milner; X. L. Wu; P. M. Chaikin

doi:10.1103/PhysRevA.46.6550

Nonergodicity and light scattering from polymer gels

J. Z. Xue, D. J. Pine, S. T. Milner, X. L. Wu, P. M. Chaikin

Chemical and Biomolecular Engineering

Research output: Contribution to journal › Article › peer-review

Abstract

Dynamic light scattering from polymer gels is complicated by the fact that the scattering intensity and its time correlation function change as different parts of a sample are explored. This results from the nonergodicity of the sample-time averages are not the same as ensemble averages, the result of a finite rigidity that leads to constrained inhomogeneities. We demonstrate a direct technique for ensemble averaging (by moving the sample), present the experimental correlation function containing correlations that do not decay with time, and show that the light scattering results from a superposition of static scattering from immobile inhomogeneities and dynamic density fluctuations from ''gel modes.''

Original language	English (US)
Pages (from-to)	6550-6563
Number of pages	14
Journal	Physical Review A
Volume	46
Issue number	10
DOIs	https://doi.org/10.1103/PhysRevA.46.6550
State	Published - 1992

ASJC Scopus subject areas

Atomic and Molecular Physics, and Optics

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10.1103/PhysRevA.46.6550

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AU - Pine, D. J.

AU - Milner, S. T.

AU - Wu, X. L.

AU - Chaikin, P. M.

PY - 1992

Y1 - 1992

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AB - Dynamic light scattering from polymer gels is complicated by the fact that the scattering intensity and its time correlation function change as different parts of a sample are explored. This results from the nonergodicity of the sample-time averages are not the same as ensemble averages, the result of a finite rigidity that leads to constrained inhomogeneities. We demonstrate a direct technique for ensemble averaging (by moving the sample), present the experimental correlation function containing correlations that do not decay with time, and show that the light scattering results from a superposition of static scattering from immobile inhomogeneities and dynamic density fluctuations from ''gel modes.''

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Nonergodicity and light scattering from polymer gels

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