Specific counterion effect on the adsorbed film of cationic surfactant mixtures at the air/water interface

H. H. Li, Yosuke Imai, Michio Yamanaka, Y. Hayami, Takanori Takiue, Hiroki Matsubara, Makoto Aratono

Research output: Contribution to journalArticle

15 Citations (Scopus)

Abstract

To investigate the counterion effects, we employed dodecyltrimethylammonium bromide (DTABr)-dodecyltrimethylammonium tetrafluoroborate (DTABF4) mixed aqueous solutions and measured their surface tensions, then analyzed these data in a thermodynamic treatment. The tensiometry showed that DTABF4 was more effective in lowering the surface tension of water. The phase diagram of adsorption demonstrated that the surface was enriched with BF4- ions, but the composition of Br- ions in the adsorbed film was slightly enhanced compared to the ideal mixing criteria. These were explained in terms of the size and polarizability of counterions. Moreover, the distribution of counterions of the DTABr-DTABF4 mixtures in the adsorbed film is greatly different from that of the 1-hexyl-3-methylimidazolium bromide (HMIMBr)-1-hexyl-3-methylimidazolium tetrafluoroborate (HMIMBF4) mixtures, where a stronger hydrogen-bonding exists between BF4- and HMIM+ ions. These findings suggest that the adsorption of counterions in electric double layers is likely subject to two factors: the nature of counterion and their interactions with surfactant ions.

Original languageEnglish
Pages (from-to)189-193
Number of pages5
JournalJournal of Colloid And Interface Science
Volume359
Issue number1
DOIs
Publication statusPublished - Jul 1 2011

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Cationic surfactants
Ions
Water
Air
Surface tension
Adsorption
Bromides
Surface-Active Agents
Phase diagrams
Hydrogen bonds
Surface active agents
Thermodynamics
Chemical analysis
dodecyltrimethylammonium

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Biomaterials
  • Surfaces, Coatings and Films
  • Colloid and Surface Chemistry

Cite this

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abstract = "To investigate the counterion effects, we employed dodecyltrimethylammonium bromide (DTABr)-dodecyltrimethylammonium tetrafluoroborate (DTABF4) mixed aqueous solutions and measured their surface tensions, then analyzed these data in a thermodynamic treatment. The tensiometry showed that DTABF4 was more effective in lowering the surface tension of water. The phase diagram of adsorption demonstrated that the surface was enriched with BF4- ions, but the composition of Br- ions in the adsorbed film was slightly enhanced compared to the ideal mixing criteria. These were explained in terms of the size and polarizability of counterions. Moreover, the distribution of counterions of the DTABr-DTABF4 mixtures in the adsorbed film is greatly different from that of the 1-hexyl-3-methylimidazolium bromide (HMIMBr)-1-hexyl-3-methylimidazolium tetrafluoroborate (HMIMBF4) mixtures, where a stronger hydrogen-bonding exists between BF4- and HMIM+ ions. These findings suggest that the adsorption of counterions in electric double layers is likely subject to two factors: the nature of counterion and their interactions with surfactant ions.",
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AU - Li, H. H.

AU - Imai, Yosuke

AU - Yamanaka, Michio

AU - Hayami, Y.

AU - Takiue, Takanori

AU - Matsubara, Hiroki

AU - Aratono, Makoto

PY - 2011/7/1

Y1 - 2011/7/1

N2 - To investigate the counterion effects, we employed dodecyltrimethylammonium bromide (DTABr)-dodecyltrimethylammonium tetrafluoroborate (DTABF4) mixed aqueous solutions and measured their surface tensions, then analyzed these data in a thermodynamic treatment. The tensiometry showed that DTABF4 was more effective in lowering the surface tension of water. The phase diagram of adsorption demonstrated that the surface was enriched with BF4- ions, but the composition of Br- ions in the adsorbed film was slightly enhanced compared to the ideal mixing criteria. These were explained in terms of the size and polarizability of counterions. Moreover, the distribution of counterions of the DTABr-DTABF4 mixtures in the adsorbed film is greatly different from that of the 1-hexyl-3-methylimidazolium bromide (HMIMBr)-1-hexyl-3-methylimidazolium tetrafluoroborate (HMIMBF4) mixtures, where a stronger hydrogen-bonding exists between BF4- and HMIM+ ions. These findings suggest that the adsorption of counterions in electric double layers is likely subject to two factors: the nature of counterion and their interactions with surfactant ions.

AB - To investigate the counterion effects, we employed dodecyltrimethylammonium bromide (DTABr)-dodecyltrimethylammonium tetrafluoroborate (DTABF4) mixed aqueous solutions and measured their surface tensions, then analyzed these data in a thermodynamic treatment. The tensiometry showed that DTABF4 was more effective in lowering the surface tension of water. The phase diagram of adsorption demonstrated that the surface was enriched with BF4- ions, but the composition of Br- ions in the adsorbed film was slightly enhanced compared to the ideal mixing criteria. These were explained in terms of the size and polarizability of counterions. Moreover, the distribution of counterions of the DTABr-DTABF4 mixtures in the adsorbed film is greatly different from that of the 1-hexyl-3-methylimidazolium bromide (HMIMBr)-1-hexyl-3-methylimidazolium tetrafluoroborate (HMIMBF4) mixtures, where a stronger hydrogen-bonding exists between BF4- and HMIM+ ions. These findings suggest that the adsorption of counterions in electric double layers is likely subject to two factors: the nature of counterion and their interactions with surfactant ions.

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