Surface Structure and Oxygen Permeation in Mixed Multibilayer Films of Hydrocarbon and Fluorocarbon Amphiphiles

Nobuyuki Higashi; Toyoki Kunitake; Tisato Kajiyama

doi:10.1021/ma00159a014

Surface Structure and Oxygen Permeation in Mixed Multibilayer Films of Hydrocarbon and Fluorocarbon Amphiphiles

Nobuyuki Higashi, Toyoki Kunitake, Tisato Kajiyama

Institute for Advanced Study

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

8 Citations (Scopus)

Abstract

Multicomponent bilayers of double-chain (fluorocarbon, 2F; hydrocarbon, 2H; mixed chain, 1F1H) ammonium amphiphiles were immobilized on Millipore membranes as composite films with poly(vinyl alcohol). Differential scanning calorimetry and ESCA indicated that the hydrocarbon and fluorocarbon components form separated domains and that the fluorocarbon component is concentrated near the film surface. Permeation of 0₂ and N₂ through these films was examined by the high-vacuum method. The separation factor (Po₂/P_N2 = 2.0–2.8) was apparently determined by the surface monolayer formed from the fluorocarbon (2F) amphiphile, without regard to the hydrocarbon (2H) content. The permeability coefficient (P) was enhanced by the presence of the fluid domain of the liquid-crystalline hydrocarbon (2H) bilayer, and a 100 times jump in P was observed for a composite film of 2F/2H/1F1H (1:7:1) and PVA near the phase transition temperature of the hydrocarbon bilayer.

Original language	English
Pages (from-to)	1362-1366
Number of pages	5
Journal	Macromolecules
Volume	19
Issue number	5
DOIs	https://doi.org/10.1021/ma00159a014
Publication status	Published - Jan 1 1986

All Science Journal Classification (ASJC) codes

Organic Chemistry
Polymers and Plastics
Inorganic Chemistry
Materials Chemistry

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title = "Surface Structure and Oxygen Permeation in Mixed Multibilayer Films of Hydrocarbon and Fluorocarbon Amphiphiles",

abstract = "Multicomponent bilayers of double-chain (fluorocarbon, 2F; hydrocarbon, 2H; mixed chain, 1F1H) ammonium amphiphiles were immobilized on Millipore membranes as composite films with poly(vinyl alcohol). Differential scanning calorimetry and ESCA indicated that the hydrocarbon and fluorocarbon components form separated domains and that the fluorocarbon component is concentrated near the film surface. Permeation of 02 and N2 through these films was examined by the high-vacuum method. The separation factor (Po2/PN2 = 2.0–2.8) was apparently determined by the surface monolayer formed from the fluorocarbon (2F) amphiphile, without regard to the hydrocarbon (2H) content. The permeability coefficient (P) was enhanced by the presence of the fluid domain of the liquid-crystalline hydrocarbon (2H) bilayer, and a 100 times jump in P was observed for a composite film of 2F/2H/1F1H (1:7:1) and PVA near the phase transition temperature of the hydrocarbon bilayer.",

author = "Nobuyuki Higashi and Toyoki Kunitake and Tisato Kajiyama",

year = "1986",

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T1 - Surface Structure and Oxygen Permeation in Mixed Multibilayer Films of Hydrocarbon and Fluorocarbon Amphiphiles

AU - Higashi, Nobuyuki

AU - Kunitake, Toyoki

AU - Kajiyama, Tisato

PY - 1986/1/1

Y1 - 1986/1/1

N2 - Multicomponent bilayers of double-chain (fluorocarbon, 2F; hydrocarbon, 2H; mixed chain, 1F1H) ammonium amphiphiles were immobilized on Millipore membranes as composite films with poly(vinyl alcohol). Differential scanning calorimetry and ESCA indicated that the hydrocarbon and fluorocarbon components form separated domains and that the fluorocarbon component is concentrated near the film surface. Permeation of 02 and N2 through these films was examined by the high-vacuum method. The separation factor (Po2/PN2 = 2.0–2.8) was apparently determined by the surface monolayer formed from the fluorocarbon (2F) amphiphile, without regard to the hydrocarbon (2H) content. The permeability coefficient (P) was enhanced by the presence of the fluid domain of the liquid-crystalline hydrocarbon (2H) bilayer, and a 100 times jump in P was observed for a composite film of 2F/2H/1F1H (1:7:1) and PVA near the phase transition temperature of the hydrocarbon bilayer.

AB - Multicomponent bilayers of double-chain (fluorocarbon, 2F; hydrocarbon, 2H; mixed chain, 1F1H) ammonium amphiphiles were immobilized on Millipore membranes as composite films with poly(vinyl alcohol). Differential scanning calorimetry and ESCA indicated that the hydrocarbon and fluorocarbon components form separated domains and that the fluorocarbon component is concentrated near the film surface. Permeation of 02 and N2 through these films was examined by the high-vacuum method. The separation factor (Po2/PN2 = 2.0–2.8) was apparently determined by the surface monolayer formed from the fluorocarbon (2F) amphiphile, without regard to the hydrocarbon (2H) content. The permeability coefficient (P) was enhanced by the presence of the fluid domain of the liquid-crystalline hydrocarbon (2H) bilayer, and a 100 times jump in P was observed for a composite film of 2F/2H/1F1H (1:7:1) and PVA near the phase transition temperature of the hydrocarbon bilayer.

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JF - Macromolecules

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ER -

Surface Structure and Oxygen Permeation in Mixed Multibilayer Films of Hydrocarbon and Fluorocarbon Amphiphiles

Abstract

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