Dynamic light scattering in semidilute solutions of nonionic surfactants: entanglement of elongated micelles

Autor:	Tadashi Kato, Shinichi. Anzai, Tsutomu. Seimiya
Rok vydání:	1987
Předmět:	chemistry.chemical_classification Cloud point Aqueous solution Chemistry Diffusion General Engineering Analytical chemistry Concentration effect Polymer Micelle Light scattering Dynamic light scattering Organic chemistry Physical and Theoretical Chemistry
Zdroj:	The Journal of Physical Chemistry. 91:4655-4657
ISSN:	1541-5740 0022-3654
DOI:	10.1021/j100302a005
Popis:	Dynamic light scattering (DLS) has been observed for D/sub 2/O solutions of penta(oxyethylene glycol) n-dodecyl ether (C/sub 12/E/sub 5/) in the range 3-160 kg m/sup -3/ and 5-25 /sup 0/C. The mutual diffusion coefficient (D) obtained by DLS measurements takes a minimum which is shifted to lower concentrations when the temperature is increased. The log D-log c (c is concentration) plot becomes linear in the semidilute region, and the slope of the plot is close to the theoretical value for entangled polymers in good solvent. Self-diffusion coefficients of C/sub 12/E/sub 5/ in the lower concentration range have also been measured by means of pulsed-gradient FT-NMR to examine the effects of the critical concentration fluctuations.
Databáze:	OpenAIRE
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