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Dynamic light scattering by polyelectrolyte solutions
Author(s) -
Schmitz Kenneth S.
Publication year - 1994
Publication title -
macromolecular symposia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.257
H-Index - 76
eISSN - 1521-3900
pISSN - 1022-1360
DOI - 10.1002/masy.19940790107
Subject(s) - polyelectrolyte , electrolyte , dynamic light scattering , eigenvalues and eigenvectors , relaxation (psychology) , scattering , light scattering , diffusion , chemical physics , function (biology) , statistical physics , materials science , physics , mathematics , chemistry , optics , thermodynamics , polymer , nuclear magnetic resonance , nanotechnology , quantum mechanics , psychology , social psychology , electrode , evolutionary biology , biology , nanoparticle
A generalized expression for the apparent diffusion coefficient (D app ) for macroions as a function of scattering vector (q) is developed. Mathematica ®, a system of doing mathematics on a computer, was used to obtain the eigenvalues for a select set of polyion‐electrolyte systems. It is shown that under the conditions of low electrolyte concentration D app exhibits a marked q‐dependence. The second part of this communication focuses on the so‐called “ordinary‐extraordinary” transition observed in some polyelectrolyte systems. The characteristic D app versus electrolyte profile for this transition is compared with the “splitting” of relaxation times reported for many other polyelectrolyte systems. General problems associated with dynamic light scattering studies on macroion systems are discussed.