Effects of alkyl chain length on synergetic adsorption and micelle formation in homologous cationic surfactant mixtures

Hiroki Matsubara; Takayuki Nakano; Takashi Matsuda; Takanori Takiue; Makoto Aratono

doi:10.1021/la0508543

Effects of alkyl chain length on synergetic adsorption and micelle formation in homologous cationic surfactant mixtures

Hiroki Matsubara, Takayuki Nakano, Takashi Matsuda, Takanori Takiue, Makoto Aratono

Research output: Contribution to journal › Article › peer-review

28 Citations (Scopus)

Abstract

The surface tensions (γ) of the aqueous solutions of tetradecyltrimethylammonium bromide (TTAB) and dodecyltrimethylammonium bromide (DTAB) were measured as a function of the total molality of surfactants (m̂) and the relative proportion (composition) of DTAB (X̂ ₂) at 298.15 ± 0.05 Kunder atmospheric pressure. The effect of the difference in the hydrophobic chain length between hexadecyltrimethylammonium bromide (HTAB) and DTAB on the synergism was examined. This synergism was observed in the miscibility at the surface of a mixture of these two compounds. The excess Gibbs energy of adsorption of the TTAB-DTAB system was positive in contrast to the HTAB-DTAB system. This indicates that there are certain restrictions on the difference in the hydrophobic chain length for the synergism to be brought about in homologous cationic surfactant mixtures. This mechanism was explained by the theory of a staggered structure formation at the air/water interface. A similar argument successfully applied to the hexadecyltrimethylammonium chloride (HTAC)-dodecyltrimethylammonium chloride (DTAC) and tetradecyltrimethylammonium chloride (TTAC)-DTAC mixtures also.

Original language	English
Pages (from-to)	8131-8137
Number of pages	7
Journal	Langmuir
Volume	21
Issue number	18
DOIs	https://doi.org/10.1021/la0508543
Publication status	Published - Aug 30 2005

All Science Journal Classification (ASJC) codes

Materials Science(all)
Condensed Matter Physics
Surfaces and Interfaces
Spectroscopy
Electrochemistry

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10.1021/la0508543

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title = "Effects of alkyl chain length on synergetic adsorption and micelle formation in homologous cationic surfactant mixtures",

abstract = "The surface tensions (γ) of the aqueous solutions of tetradecyltrimethylammonium bromide (TTAB) and dodecyltrimethylammonium bromide (DTAB) were measured as a function of the total molality of surfactants ({\^m}) and the relative proportion (composition) of DTAB ({\^X} 2) at 298.15 ± 0.05 Kunder atmospheric pressure. The effect of the difference in the hydrophobic chain length between hexadecyltrimethylammonium bromide (HTAB) and DTAB on the synergism was examined. This synergism was observed in the miscibility at the surface of a mixture of these two compounds. The excess Gibbs energy of adsorption of the TTAB-DTAB system was positive in contrast to the HTAB-DTAB system. This indicates that there are certain restrictions on the difference in the hydrophobic chain length for the synergism to be brought about in homologous cationic surfactant mixtures. This mechanism was explained by the theory of a staggered structure formation at the air/water interface. A similar argument successfully applied to the hexadecyltrimethylammonium chloride (HTAC)-dodecyltrimethylammonium chloride (DTAC) and tetradecyltrimethylammonium chloride (TTAC)-DTAC mixtures also.",

author = "Hiroki Matsubara and Takayuki Nakano and Takashi Matsuda and Takanori Takiue and Makoto Aratono",

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T1 - Effects of alkyl chain length on synergetic adsorption and micelle formation in homologous cationic surfactant mixtures

AU - Matsubara, Hiroki

AU - Nakano, Takayuki

AU - Matsuda, Takashi

AU - Takiue, Takanori

AU - Aratono, Makoto

PY - 2005/8/30

Y1 - 2005/8/30

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AB - The surface tensions (γ) of the aqueous solutions of tetradecyltrimethylammonium bromide (TTAB) and dodecyltrimethylammonium bromide (DTAB) were measured as a function of the total molality of surfactants (m̂) and the relative proportion (composition) of DTAB (X̂ 2) at 298.15 ± 0.05 Kunder atmospheric pressure. The effect of the difference in the hydrophobic chain length between hexadecyltrimethylammonium bromide (HTAB) and DTAB on the synergism was examined. This synergism was observed in the miscibility at the surface of a mixture of these two compounds. The excess Gibbs energy of adsorption of the TTAB-DTAB system was positive in contrast to the HTAB-DTAB system. This indicates that there are certain restrictions on the difference in the hydrophobic chain length for the synergism to be brought about in homologous cationic surfactant mixtures. This mechanism was explained by the theory of a staggered structure formation at the air/water interface. A similar argument successfully applied to the hexadecyltrimethylammonium chloride (HTAC)-dodecyltrimethylammonium chloride (DTAC) and tetradecyltrimethylammonium chloride (TTAC)-DTAC mixtures also.

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Effects of alkyl chain length on synergetic adsorption and micelle formation in homologous cationic surfactant mixtures

Abstract

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