Observation of G-LE and LE-LC phase transitions of adsorbed 1- dodecanol monolayer from dynamic surface-tension profiles

Ruey Yug Tsay; Tsuei Fen Wu; Shi Yow Lin

doi:10.1021/jp047277w

Observation of G-LE and LE-LC phase transitions of adsorbed 1- dodecanol monolayer from dynamic surface-tension profiles

Ruey Yug Tsay, Tsuei Fen Wu, Shi Yow Lin^*

^*Corresponding author for this work

Department of Biomedical Engineering

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

45 Scopus citations

Abstract

Two phase transitions, G-LE and LE-LC, of the adsorbed monolayer of the soluble surfactant 1-dodecanol at the air-water interface were observed from the dynamic surface tension measurement by using a pendant bubble tensiometer. Two constant surface-tension (γ) regions were detected in the dynamic surface-tension γ(t) profiles of different surfactant concentrations at 20°C. They are at n = 0.75 and 17.9 mN/m. A constant γ region in dynamic γ(t) profiles indicates the existence of a 2D phase transition. These 2D phase transitions of adsorbed layer are presumed to be the coexistence of the gas (G) and liquid-expanded (LE) phases and that of the LE and liquid-condensed (LC) phases. A new phase-transition isotherm, which is possible to describe the 1-dodecanol adsorbed monolayer, is also proposed.

Original language	English
Pages (from-to)	18623-18629
Number of pages	7
Journal	Journal of Physical Chemistry B
Volume	108
Issue number	48
DOIs	https://doi.org/10.1021/jp047277w
State	Published - 2 Dec 2004

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title = "Observation of G-LE and LE-LC phase transitions of adsorbed 1- dodecanol monolayer from dynamic surface-tension profiles",

abstract = "Two phase transitions, G-LE and LE-LC, of the adsorbed monolayer of the soluble surfactant 1-dodecanol at the air-water interface were observed from the dynamic surface tension measurement by using a pendant bubble tensiometer. Two constant surface-tension (γ) regions were detected in the dynamic surface-tension γ(t) profiles of different surfactant concentrations at 20°C. They are at n = 0.75 and 17.9 mN/m. A constant γ region in dynamic γ(t) profiles indicates the existence of a 2D phase transition. These 2D phase transitions of adsorbed layer are presumed to be the coexistence of the gas (G) and liquid-expanded (LE) phases and that of the LE and liquid-condensed (LC) phases. A new phase-transition isotherm, which is possible to describe the 1-dodecanol adsorbed monolayer, is also proposed.",

author = "Tsay, {Ruey Yug} and Wu, {Tsuei Fen} and Lin, {Shi Yow}",

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T1 - Observation of G-LE and LE-LC phase transitions of adsorbed 1- dodecanol monolayer from dynamic surface-tension profiles

AU - Tsay, Ruey Yug

AU - Wu, Tsuei Fen

AU - Lin, Shi Yow

PY - 2004/12/2

Y1 - 2004/12/2

N2 - Two phase transitions, G-LE and LE-LC, of the adsorbed monolayer of the soluble surfactant 1-dodecanol at the air-water interface were observed from the dynamic surface tension measurement by using a pendant bubble tensiometer. Two constant surface-tension (γ) regions were detected in the dynamic surface-tension γ(t) profiles of different surfactant concentrations at 20°C. They are at n = 0.75 and 17.9 mN/m. A constant γ region in dynamic γ(t) profiles indicates the existence of a 2D phase transition. These 2D phase transitions of adsorbed layer are presumed to be the coexistence of the gas (G) and liquid-expanded (LE) phases and that of the LE and liquid-condensed (LC) phases. A new phase-transition isotherm, which is possible to describe the 1-dodecanol adsorbed monolayer, is also proposed.

AB - Two phase transitions, G-LE and LE-LC, of the adsorbed monolayer of the soluble surfactant 1-dodecanol at the air-water interface were observed from the dynamic surface tension measurement by using a pendant bubble tensiometer. Two constant surface-tension (γ) regions were detected in the dynamic surface-tension γ(t) profiles of different surfactant concentrations at 20°C. They are at n = 0.75 and 17.9 mN/m. A constant γ region in dynamic γ(t) profiles indicates the existence of a 2D phase transition. These 2D phase transitions of adsorbed layer are presumed to be the coexistence of the gas (G) and liquid-expanded (LE) phases and that of the LE and liquid-condensed (LC) phases. A new phase-transition isotherm, which is possible to describe the 1-dodecanol adsorbed monolayer, is also proposed.

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Observation of G-LE and LE-LC phase transitions of adsorbed 1- dodecanol monolayer from dynamic surface-tension profiles

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