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Physical properties of rod‐shaped molecules in solution
Author(s) -
Stimpson Donald I.,
Bloomfield Victor A.
Publication year - 1985
Publication title -
biopolymers
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.556
H-Index - 125
eISSN - 1097-0282
pISSN - 0006-3525
DOI - 10.1002/bip.360240207
Subject(s) - rod , chemistry , rayleigh scattering , light scattering , scattering , flow birefringence , trigonometric functions , interpolation (computer graphics) , optics , birefringence , mechanics , classical mechanics , physics , geometry , mathematics , medicine , motion (physics) , alternative medicine , pathology
Several theories describing the physical properties of solutions containing rod‐shaped molecules are reviewed. The results of the various theories are presented in a convenient form for implementation on a calculator or microcomputer. Expressions are derived for light scattering from thin rods using rational approximations for the sine and cosine integrals. These expressions apply to turbidity, Rayleigh, and dynamic light‐scattering measurements. Accurate approximating equations are given for the various diffusional motions involved in dynamic light scattering. For shear‐dependent viscosity and flow birefringence, empirically derived interpolation formulas are given. These provide values of the Simha factor, extinction angle and orientation function for a wide range of axial ratios and velocity gradients with relative errors less than 1%. We demonstrate how these equations can be applied to predict or model the properties of a solution containing thin rods of various lengths.