21 July 1993 Application of probe diffusion models to sphere diffusion in a rod/sphere composite liquid
Author Affiliations +
Proceedings Volume 1884, Static and Dynamic Light Scattering in Medicine and Biology; (1993) https://doi.org/10.1117/12.148373
Event: OE/LASE'93: Optics, Electro-Optics, and Laser Applications in Scienceand Engineering, 1993, Los Angeles, CA, United States
Abstract
Five composite liquid solutions (CL1-5) were prepared consisting of silica spheres and the rigid rod polymer poly(γ-benzyl α,L-glutamate) (PBLG) in the polar organic solvent dimethylformamide. The sizes of the macromolecular components in each solution were chosen such that the sphere radius/rod length ratio decreased from CL1 to CL5. The sphere diffusion constants in the composite liquids were measured as a function of the rod concentration by dynamic light scattering. Microviscosities (ημ ) as low as 1/2 of the solution viscosity (η) were found. The sphere diffusion constant data was fit to a stretched exponential of the form D/Do equals exp(-αcv) which is predicted by several models for the diffusion of spheres in polymer solutions. From these fits, we conclude (1) the stretched exponential fit is worst if ημ < η, (2) models predicting a stretched exponential offer no explanation for ημ < η, and (3) the experimentally determined values for v compare well to other experimental data but not to theoretical predictions.
© (1993) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Mark A. Tracy, Mark A. Tracy, Robert Pecora, Robert Pecora, "Application of probe diffusion models to sphere diffusion in a rod/sphere composite liquid", Proc. SPIE 1884, Static and Dynamic Light Scattering in Medicine and Biology, (21 July 1993); doi: 10.1117/12.148373; https://doi.org/10.1117/12.148373
PROCEEDINGS
12 PAGES


SHARE
Back to Top