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Zimm plot

A diagrammatic representation of data on scattering from large particles, corresponding to the equation:
K c Δ R θ = 1 M ̄ w P θ + 2 A 2 c + ...
and used for the simultaneous evaluation of the mass average molar mass, M ̄ w, the second virial coefficient of the chemical potential, A 2, and (usually) the z-average radius of gyration, s 2 z 1 2; c is the mass concentration of the solute, Δ R θ the excess Rayleigh ratio, and P θ the particle scattering function that comprises (usually) the z-average radius of gyration. K depends on the solute, the temperature and the type of radiation employed. Several modifications of the Zimm plot are in frequent use; the most common one uses the excess scattering instead of the excess Rayleigh ratio.
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IUPAC. Compendium of Chemical Terminology, 2nd ed. (the "Gold Book"). Compiled by A. D. McNaught and A. Wilkinson. Blackwell Scientific Publications, Oxford (1997). XML on-line corrected version: (2006-) created by M. Nic, J. Jirat, B. Kosata; updates compiled by A. Jenkins. ISBN 0-9678550-9-8.
Last update: 2014-02-24; version: 2.3.3.
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