Accession Number : AD0700021

Title :   LIGHT SCATTERING INVESTIGATIONS OF SIMPLE AND MULTICOMPONENT SOLUTIONS OF COLLOIDAL SILICA.

Descriptive Note : Technical rept.,

Corporate Author : DREXEL INST OF TECH PHILADELPHIA PA DEPT OF ELECTRICAL ENGINEERING

Personal Author(s) : DiSaverio,Joseph ; Beard,Richard B.

Report Date : 01 DEC 1969

Pagination or Media Count : 162

Abstract : Light scattering experiments were performed at 546 and 436 millimicrons wavelengths of light for both binary and ternary systems. The binary systems included aqueous dispersions of colloidal silica, the micelle forming electrolyte sodium dodecyl sulfate and the physiological mucopolysaccharide chondroitin sulfate. Ternary systems were aqueous solutions of silica to which were added either sodium dodecyl sulfate or sodium chloride. Information gained from the binary systems was limited to the determination of retractive index increments, molecular weights, virial coefficients and particle interactions. When ternary systems were studied apparent virial coefficients and molecular weights were determined and then used to calculate the effective charge of a silica particle. Electrical conductivity measurements, rather than turbidity, showed that micellization of SDS still occurs in the ternary, water-silica-SDS, solution. Whenever possible, results were compared to those of other investigators and, in general, good agreement was observed. Because light scattering is very sensitive to the presence of impurities and foreign materials in the solutions, the preparation of pure and relatively dust-free sodium dedecyl sulfate was of major concern and is also discussed. (Author)

Descriptors :   (*COLLOIDS, OPTICAL PROPERTIES), (*SILICON DIOXIDE, COLLOIDS), SCATTERING, SOLUTIONS(MIXTURES), REFRACTIVE INDEX, MOLECULAR WEIGHT, ELECTRICAL CONDUCTIVITY, POLYSACCHARIDES, THESES

Subject Categories : Atomic and Molecular Physics and Spectroscopy

Distribution Statement : APPROVED FOR PUBLIC RELEASE