Nonergodicity and light scattering from polymer gels

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

Research output: Contribution to journalArticle

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 languageEnglish (US)
Pages (from-to)6550-6563
Number of pages14
JournalPhysical Review A
Volume46
Issue number10
DOIs
StatePublished - 1992

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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    Xue, J. Z., Pine, D. J., Milner, S. T., Wu, X. L., & Chaikin, P. M. (1992). Nonergodicity and light scattering from polymer gels. Physical Review A, 46(10), 6550-6563. https://doi.org/10.1103/PhysRevA.46.6550