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Role of alkanols in micellar growth: A viscometric study
Author(s) -
Kumar Sanjeev,
Kumari Krishna
Publication year - 1995
Publication title -
journal of the american oil chemists' society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.512
H-Index - 117
eISSN - 1558-9331
pISSN - 0003-021X
DOI - 10.1007/bf02541031
Subject(s) - viscosity , chemistry , pulmonary surfactant , micellar solutions , solubility , sodium dodecyl sulfate , propanol , reduced viscosity , relative viscosity , micellar liquid chromatography , thermodynamics , intrinsic viscosity , micelle , hexanol , analytical chemistry (journal) , chromatography , aqueous solution , organic chemistry , alcohol , ethanol , polymer , biochemistry , physics
We have measured the viscosity of solutions of 0.3 M sodium dodecyl sulfate (SDS) + 0.3 M NaBr + n ‐alkanols as a function of [alkanol] and temperature. When propanol was added, the viscosity of micellar solutions remained almost constant and then decreased, whereas it continuously increased with hexanol. However, with butanol or pentanol, depending upon the added concentration, increases followed by decreases in viscosity were observed. This behavior has been discussed in light of solubility of alkanols in various soluble phases of the micellar system with a resultant change in the Mitchell‐Ninham parameter of the “effective surfactant” (i.e., SDS + n ‐alkanol). An increase in temperature caused a decrease in viscosity, which is related to micellar breakdown. Activation parameters (ΔG* and ΔH*) were computed from the temperature dependence data. ΔH* Covered almost the total contribution to ΔG*.