Accession Number : AD0261748

Title :   LIGHT SCATTERING OF FLOWING COLLOIDAL SYSTEMS

Corporate Author : WAYNE STATE UNIV DETROIT MICH

Personal Author(s) : PAPAZIAN,LOUIS A.

Report Date : 31 AUG 1961

Pagination or Media Count : 1

Abstract : A method was developed for the purpose of determining the size and shape of anisometric colloidal particles and flexible macromolecules. The experimental technique used for this determination is the measurement of the change in the intensity of the light scattered by anisometric colloidal particles (or macromolecules) when oriented (or deformed) by a velocity gradient. Improvements in the system will extend the present range of measurements to rigid colloidal particles whose longest dimension is less than 300 mu and to high molecular weight polymers. The apparatus has been successfully tested with suspensions of tobacco mosaic virus and the experimental results have been compared with the theory of Okano and Wada (J. Chem. Phys., 34: 405, 1961) for thin rod-like particles. Preliminary observations made with flexible macromolecules indicate that the effect of deformability of high molecular weight polymers, subjected to a velocity gradient, is quite small under the conditions of this study, as predicted theoretically. (Author)

Descriptors :   *COLLOIDS, *PHYSICAL CHEMISTRY, LIGHT, MEASUREMENT, OPTICAL EQUIPMENT, PARTICLES, PHOTOMETERS, TEST EQUIPMENT, TEST METHODS, THEORY

Distribution Statement : APPROVED FOR PUBLIC RELEASE