ISSN:
1435-1536
Keywords:
Syntans micelles
;
Shape
;
Size and flow
;
Correlation times
;
Hydrodynamic & optical studies
;
Viscosity equations
Source:
Springer Online Journal Archives 1860-2000
Topics:
Chemistry and Pharmacology
,
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
Abstract The results of viscometric and optical microscopic studies indicated that both Syntan 25 and Syntan PUR in aqueous concentrated solutions (above their c.m.c. values) at 25 °C are spherical in shape. The size and other physico-chemical parameters e. g. Volumes of the aggregated particleM v, Radius of gyrationR g, Hydrodynamic radius ¯R h, Diffusion coefficient ¯D, and the Correlation times for aggregate rotationT r Translational diffusionT D and effective aggregation timeT a have been derived on the basis of microscopic results. The viscosity data for both Syntan 25 and Syntan PUR were analysed in terms of Einstein equation, Moulik equation, Jones-Dole equation. It has been shown that Syntan PUR was more highly hydrated than that of Syntan 25 although the intrinsic viscosity [η], of Syntan PUR is nearly 1.5 times greater than that of Syntan 25. The Flory-Huggins equation and Thomas equation has been compared in both the Syntans and it has been concluded that the Thomas' constantk 1 may be 12.50 for perfect spherical shape of the particle instead of 10.05 (which has originally been proposed by Thomas).
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF01414657
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