Thermal and collective diffusion in polymer solutions

A small angle light scattering study

Ian M. Jamie, David W. James, Erik Geissler*

*Corresponding author for this work

Research output: Contribution to journalArticle

Abstract

Two experimental arrangements are described whereby the thermal and collective diffusion coefficients X and Dc of semi-dilute or concentrated polymer solutions may be measured using small angle light scattering. The first is achieved by measuring the characteristic time τ of the decay in the angular spread of the nonlinear diffraction pattern following an abrupt reduction of the incident laser power, together with a knowledge of the beam diameter. The second is obtained by allowing the solution to develop a slight refractive index gradient through surface evaporation of the solvent, and then following the decay in intensity of the light scattered through a small angle after the solution has been shaken.

Original languageEnglish
Pages (from-to)255-260
Number of pages6
JournalOptics Communications
Volume56
Issue number4
DOIs
Publication statusPublished - 15 Dec 1985
Externally publishedYes

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