Nonergodicity and light scattering from polymer gels

J. Z. Xue, D. J. Pine, Scott Thomas Milner, X. L. Wu, P. M. Chaikin

Research output: Contribution to journalArticlepeer-review

150 Scopus citations

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 - Jan 1 1992

All Science Journal Classification (ASJC) codes

  • Atomic and Molecular Physics, and Optics

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