Titration microcalorimetry of micelle formation in aqueous solutions containing alkylpolyoxyethylene glycol ethers, C12H25(OCH2CH2)mOH where m=3, 4 and 5, and octadecyltrimethylammonium bromide

文献情報

出版日 2000-09-06

DOI 10.1039/B004501M

インパクトファクター 3.676

著者

Jan B. F. N. Engberts, Jan Kevelam

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要旨

Titration microcalorimetric results are reported for alkylpolyoxyethylene glycol ethers, C12H25(OCH2CH2)mOH where m=3, 4 or 5 at ambient pressure and 298.2 K. The enthalpograms yield estimates of critical micelle concentrations (c.m.c.) which for these surfactants cover the range from 3.25(±0.22)×10−5 to 5.26(±0.49)×10−5 mol dm−3 with increasing integer m. The enthalpograms are complicated. Although the recorded enthalpies of injection are exothermic, the dominant process accompanying injection of an aliquot into the sample cell is not simple micelle deaggregation. Rather these surfactant solutions above the c.m.c. contain both micelles and higher aggregates. In a similar fashion, enthalpograms for aqueous solutions containing octadecyltrimethylammonium bromide, C18H37N+ Me3Br− (OCTAB) do not follow the previously reported pattern for n-hexadecyltrimethylammonium bromide (CTAB), pointing to the dramatic impact of an additional methylene group in the alkyl chain of the cationic surfactant on the aggregation of this surfactant in aqueous solution.

掲載誌

Physical Chemistry Chemical Physics

CiteScore: 5.5

自己引用率: 10.3%

年間論文数: 3036

Physical Chemistry Chemical Physics (PCCP) is an international journal co-owned by 19 physical chemistry and physics societies from around the world. This journal publishes original, cutting-edge research in physical chemistry, chemical physics and biophysical chemistry. To be suitable for publication in PCCP, articles must include significant innovation and/or insight into physical chemistry; this is the most important criterion that reviewers and Editors will judge against when evaluating submissions. The journal has a broad scope and welcomes contributions spanning experiment, theory, computation and data science. Topical coverage includes spectroscopy, dynamics, kinetics, statistical mechanics, thermodynamics, electrochemistry, catalysis, surface science, quantum mechanics, quantum computing and machine learning. Interdisciplinary research areas such as polymers and soft matter, materials, nanoscience, energy, surfaces/interfaces, and biophysical chemistry are welcomed if they demonstrate significant innovation and/or insight into physical chemistry. Joined experimental/theoretical studies are particularly appreciated when complementary and based on up-to-date approaches.

Titration microcalorimetry of micelle formation in aqueous solutions containing alkylpolyoxyethylene glycol ethers, C12H25(OCH2CH2)mOH where m=3, 4 and 5, and octadecyltrimethylammonium bromide

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