Rotational Mobility of Spin Probes
in Micelles of Sodium Alkyl Sulfates

A. M. Vasserman, I. I. Barashkova, T. V. Medvedeva, and V. F. Tarasov

Semenov Institute of Chemical Physics, Russian Academy of Sciences, ul. Kosygina 4, Moscow, 117977 Russia

Received November 30, 1995

Abstract—Rotational mobility of spin probes in micelles of sodium alkyl sulfates was determined for probes
of different molecular shapes and sizes. Probes with paramagnetic fragments localized either near the inter-
phase boundary or in the hydrocarbon nucleus of the micelle were used. Increasing the number of carbon atoms
in the alkyl chain of the detergent from 7 to 13 decreased the local molecular mobility in the micelle by a factor
of 1.5 to 2.

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