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Effects of surfactants on transition kinetics of stearic acid polymorphs
Author(s) -
Garti Nissim,
Sato Kiyotaka
Publication year - 1986
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/bf02546145
Subject(s) - stearic acid , pulmonary surfactant , kinetics , decane , chemistry , solubility , nonionic surfactant , solvent , methanol , organic chemistry , biochemistry , physics , quantum mechanics
The effects of some nonionic surfactants on the kinetics of the solution‐mediated transition of stearic acid of B and C polymorphs were studied. Some surfactants were found to retard the transition of the thermodynamically unstable stearic acid modification to the stable form in methanol, n‐hexane and decane solutions. The surfactants consisting of large hydrophilic moieties revealed a significant retardation effect. The effect also depends on the solvent; the lower the solubility of the surfactant in the solvents, the more the transition rate was decreased. Finally it should be noted that the C→B transition was more affected than the B→C transition with a given surfactant.