Interfacial tension studies of crown ethers at air/water and hexane/water interfaces

Saeid Azizian, Kaoru Kashimoto, Takashi Matsuda, Hiroki Matsubara, Takanori Takiue, Makoto Aratono

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

The adsorption of phase transfer catalysts, 18-crown-6 and dicyclohexano-18-crown-6, at the air/water and the hexane/water interfaces were investigated. Interfacial tension σ decreased by increasing concentrations of these compounds and therefore both of these crown ethers are accumulated at interfaces. The variation of σ with concentration for both compounds follows the Szyszkowski equation very well, from which the values of saturated surface densities and interaction parameters have been evaluated. On the basis of occupied surface area of each molecule, the orientation of each of molecules at the air/water and the hexane/water interfaces have been proposed. The present results show that dicyclohexano-18-crown-6 has the higher tendency not only to dissolve into the hexane phase but also to adsorb at the hexane/water interface than 18-crown-6 and that the Starks extraction mechanism was suggested for the present phase transfer catalysis systems.

Original languageEnglish
Pages (from-to)25-30
Number of pages6
JournalJournal of Colloid And Interface Science
Volume316
Issue number1
DOIs
Publication statusPublished - Dec 1 2007

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Crown Ethers
Crown ethers
Hexanes
Hexane
Surface tension
Water
Air
Molecules
Catalysis
Adsorption
Catalysts

All Science Journal Classification (ASJC) codes

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

Cite this

Interfacial tension studies of crown ethers at air/water and hexane/water interfaces. / Azizian, Saeid; Kashimoto, Kaoru; Matsuda, Takashi; Matsubara, Hiroki; Takiue, Takanori; Aratono, Makoto.

In: Journal of Colloid And Interface Science, Vol. 316, No. 1, 01.12.2007, p. 25-30.

Research output: Contribution to journalArticle

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AU - Kashimoto, Kaoru

AU - Matsuda, Takashi

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AU - Takiue, Takanori

AU - Aratono, Makoto

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N2 - The adsorption of phase transfer catalysts, 18-crown-6 and dicyclohexano-18-crown-6, at the air/water and the hexane/water interfaces were investigated. Interfacial tension σ decreased by increasing concentrations of these compounds and therefore both of these crown ethers are accumulated at interfaces. The variation of σ with concentration for both compounds follows the Szyszkowski equation very well, from which the values of saturated surface densities and interaction parameters have been evaluated. On the basis of occupied surface area of each molecule, the orientation of each of molecules at the air/water and the hexane/water interfaces have been proposed. The present results show that dicyclohexano-18-crown-6 has the higher tendency not only to dissolve into the hexane phase but also to adsorb at the hexane/water interface than 18-crown-6 and that the Starks extraction mechanism was suggested for the present phase transfer catalysis systems.

AB - The adsorption of phase transfer catalysts, 18-crown-6 and dicyclohexano-18-crown-6, at the air/water and the hexane/water interfaces were investigated. Interfacial tension σ decreased by increasing concentrations of these compounds and therefore both of these crown ethers are accumulated at interfaces. The variation of σ with concentration for both compounds follows the Szyszkowski equation very well, from which the values of saturated surface densities and interaction parameters have been evaluated. On the basis of occupied surface area of each molecule, the orientation of each of molecules at the air/water and the hexane/water interfaces have been proposed. The present results show that dicyclohexano-18-crown-6 has the higher tendency not only to dissolve into the hexane phase but also to adsorb at the hexane/water interface than 18-crown-6 and that the Starks extraction mechanism was suggested for the present phase transfer catalysis systems.

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