Micellar microviscosity of ionic surfactants under high pressure

Journal Article · Tue Dec 01 23:00:00 EST 1981 · J. Am. Chem. Soc.; (United States)

DOI:https://doi.org/10.1021/ja00414a030· OSTI ID:5915892

Turro, N J; Okubo, T

The microviscosities of ionic micelles of sodium dodecylsulfate (SDS), hexadecyltrimethylammonium bromide (HDTBR), and hexadecyltrimethylammonium chloride (HDTCL) are estimated from the monomer-excimer ratio of 1,3-..cap alpha.. dinaphthylpropane (DNP) under high pressure (one to 2610 bars). Excimer formation is inhibited with elevated pressure. The derived microviscosities (eta of SDS, HDTBR, and HDTCL) are 12, 47, and 27 cp, respectively, at 25 C, at atmospheric pressure. The eta values increase with pressure from 27 cp (one bar) to 101 cp (2610 bars) for HDTCL. Additions of sodium chloride, sodium sulfate, and ethanol to the surfactant solutions are found to generally decrease the eta values. The intermolecular excimer formation of pyrene in surfactant solutions is retarded by application of high pressure. However, the eximer-monomer ratio of pyrene does not give values of micellar microviscosity that are consistent with those derived from the DNP method. The data on the pressure dependence of micellar microviscosity is consistent with the penetration of water into the interior of micelle cores. 18 references.

• OSTI ID: 5915892
• Journal Information: J. Am. Chem. Soc.; (United States), Journal Name: J. Am. Chem. Soc.; (United States) Vol. 103:24; ISSN JACSA
• Country of Publication: United States
• Language: English

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