Effect of added electrolytes, NaCl and LiCl, on the palisade layer water structure of Triton X-100 micelle: A fluorescence anisotropy study

Details Effect of added electrolytes, NaCl and LiCl, on the palisade layer water structure of Triton X-100 micelle: A fluorescence anisotropy study Effect of added electrolytes, NaCl and LiCl, on the palisade layer water structure of Triton X-100 micelle: A fluorescence anisotropy study

Sep 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005cpl...413..142k&link_type=abstract

Chemical Physics Letters, Vol. 413, No. 1-3, p. 142-146

Physics

Chemical Physics

1

Scientific paper

Rotational relaxation times of coumarin 151 dye in Triton X-100 micelle gradually increase with added NaCl, and is interpreted as the increased microviscosity due to strong hydration of Na+ ions in the Palisade layer, causing the entrapped water molecules to form clusters around the ions. Contrary to this, with added LiCl, rotational relaxation times initially decrease and then show a sudden increase beyond about 1 M salt. This is attributed to the complexation of Li+ ions with surfactant oxoethylene groups at lower LiCl concentrations. At higher LiCl concentrations, the above complexation apparently gets saturated, and the excess Li+ ions in the Palisade layer cause a sudden increase in the microviscosity via the strong hydration of these ions, as it happens with Na+ ions at all the salt concentrations.

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