Miscibility of binary surfactant mixtures in the adsorbed film and micelle

The effect of size of polar head group

Akio Ohta, Hiroki Matsubara, Norihiro Ikeda, Makoto Aratono

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17 Citations (Scopus)

Abstract

The miscibility and interaction of binary surfactant mixtures in adsorbed films and micelles were examined from the standpoint of the influence of the size of polar head groups by surface tension measurement. The mixtures were as follows; pentaethylene glycol monodecyl ether (C10E5)-pentaethylene glycol monooctyl ether (C8E5), C10E5-tetraethylene glycol monooctyl ether (C8E4), dodecyltrimethylammonium brmide-C8E4, and dodecylammonium chloride-C8E4. It was found that the lack of balance of the hydrophilic group size makes the packing of C10E5 and C8E4 molecules less favorable than that of C10E5 and C8E5 molecules both in the adsorbed film and the micelle. On the other hand, it was found that the interaction between cationic surfactant (DTAB or DAC) and C8E4 is stronger than the average of that between same species both in the adsorbed film and the micelle. The excess Gibbs energies of adsorption and micelle formation were calculated to examine the interaction between C8E4 and cationic surfactant molecules in the adsorbed film and the micelle quantitatively. The results showed that the DAC molecules, which have a smaller head group and higher surface charge density, interact with C8E4 molecules more strongly than DTAB molecules, and the interaction is stronger in micelles than in adsorbed films. These findings provide further supports on our previous view that the strong interaction is due to the surfactant ion-dipole interaction or the hydrogen bond between surfactant cation and oxyethylene group.

Original languageEnglish
Pages (from-to)403-413
Number of pages11
JournalColloids and Surfaces A: Physicochemical and Engineering Aspects
Volume183-185
DOIs
Publication statusPublished - Jul 15 2001

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Micelles
Surface-Active Agents
micelles
Surface active agents
solubility
Solubility
surfactants
Molecules
Glycols
Ether
glycols
molecules
Ethers
ethers
Cationic surfactants
interactions
Gibbs free energy
Surface charge
Charge density
Surface tension

All Science Journal Classification (ASJC) codes

  • Surfaces and Interfaces
  • Physical and Theoretical Chemistry
  • Colloid and Surface Chemistry

Cite this

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title = "Miscibility of binary surfactant mixtures in the adsorbed film and micelle: The effect of size of polar head group",
abstract = "The miscibility and interaction of binary surfactant mixtures in adsorbed films and micelles were examined from the standpoint of the influence of the size of polar head groups by surface tension measurement. The mixtures were as follows; pentaethylene glycol monodecyl ether (C10E5)-pentaethylene glycol monooctyl ether (C8E5), C10E5-tetraethylene glycol monooctyl ether (C8E4), dodecyltrimethylammonium brmide-C8E4, and dodecylammonium chloride-C8E4. It was found that the lack of balance of the hydrophilic group size makes the packing of C10E5 and C8E4 molecules less favorable than that of C10E5 and C8E5 molecules both in the adsorbed film and the micelle. On the other hand, it was found that the interaction between cationic surfactant (DTAB or DAC) and C8E4 is stronger than the average of that between same species both in the adsorbed film and the micelle. The excess Gibbs energies of adsorption and micelle formation were calculated to examine the interaction between C8E4 and cationic surfactant molecules in the adsorbed film and the micelle quantitatively. The results showed that the DAC molecules, which have a smaller head group and higher surface charge density, interact with C8E4 molecules more strongly than DTAB molecules, and the interaction is stronger in micelles than in adsorbed films. These findings provide further supports on our previous view that the strong interaction is due to the surfactant ion-dipole interaction or the hydrogen bond between surfactant cation and oxyethylene group.",
author = "Akio Ohta and Hiroki Matsubara and Norihiro Ikeda and Makoto Aratono",
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AU - Ohta, Akio

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AU - Ikeda, Norihiro

AU - Aratono, Makoto

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N2 - The miscibility and interaction of binary surfactant mixtures in adsorbed films and micelles were examined from the standpoint of the influence of the size of polar head groups by surface tension measurement. The mixtures were as follows; pentaethylene glycol monodecyl ether (C10E5)-pentaethylene glycol monooctyl ether (C8E5), C10E5-tetraethylene glycol monooctyl ether (C8E4), dodecyltrimethylammonium brmide-C8E4, and dodecylammonium chloride-C8E4. It was found that the lack of balance of the hydrophilic group size makes the packing of C10E5 and C8E4 molecules less favorable than that of C10E5 and C8E5 molecules both in the adsorbed film and the micelle. On the other hand, it was found that the interaction between cationic surfactant (DTAB or DAC) and C8E4 is stronger than the average of that between same species both in the adsorbed film and the micelle. The excess Gibbs energies of adsorption and micelle formation were calculated to examine the interaction between C8E4 and cationic surfactant molecules in the adsorbed film and the micelle quantitatively. The results showed that the DAC molecules, which have a smaller head group and higher surface charge density, interact with C8E4 molecules more strongly than DTAB molecules, and the interaction is stronger in micelles than in adsorbed films. These findings provide further supports on our previous view that the strong interaction is due to the surfactant ion-dipole interaction or the hydrogen bond between surfactant cation and oxyethylene group.

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