✦ LIBER ✦

Physical properties of rod-shaped molecules in solution

✍ Scribed by Donald I. Stimpson; Victor A. Bloomfield

Publisher: Wiley (John Wiley & Sons)
Year: 1985
Tongue: English
Weight: 631 KB
Volume: 24
Category: Article
ISSN: 0006-3525
DOI: 10.1002/bip.360240207

No coin nor oath required. For personal study only.

✦ Synopsis

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.

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