Adsorption kinetics of C12E8 at the air-water interface: Desorption from a compressed interface

Ruey Yug Tsay; Shi Yow Lin; Lung Wei Lin; Shou I. Chen

doi:10.1021/la961008i

Adsorption kinetics of C¹²E₈ at the air-water interface: Desorption from a compressed interface

Ruey Yug Tsay, Shi Yow Lin^*, Lung Wei Lin, Shou I. Chen

^*Corresponding author for this work

Department of Biomedical Engineering

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

35 Scopus citations

Abstract

The desorption of C₁₂E₈ out of an overcrowded interface due to the sudden shrinkage of a pendant bubble in a quiescent surfactant solution is studied. A video-enhanced pendant bubble tensiometry is utilized for the measurement of the relaxation in surface tension due to the desorption of surfactant. The desorption process is found to be diffusive-kinetic mixed controlled. Rate constants of adsorption/desorption are computed by comparing these tension profiles with numerical solutions, which consider both bulk diffusion and kinetic desorption processes. The values of the kinetic rate constants of C₁₂E₈ obtained from the desorption experiment are nearly the same as that obtained from the clean adsorption study (Lin, S. Y., et al., Langmuir 1996, 12, 6530). The concept that there exists a shift in controlling mechanism from diffusion control at dilute concentration to mixed diffusion-kinetic control at more elevated bulk concentration for C₁₂E₈ is therefore confirmed.

Original language	English
Pages (from-to)	3191-3197
Number of pages	7
Journal	Langmuir
Volume	13
Issue number	12
DOIs	https://doi.org/10.1021/la961008i
State	Published - 11 Jun 1997

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title = "Adsorption kinetics of C12E8 at the air-water interface: Desorption from a compressed interface",

abstract = "The desorption of C12E8 out of an overcrowded interface due to the sudden shrinkage of a pendant bubble in a quiescent surfactant solution is studied. A video-enhanced pendant bubble tensiometry is utilized for the measurement of the relaxation in surface tension due to the desorption of surfactant. The desorption process is found to be diffusive-kinetic mixed controlled. Rate constants of adsorption/desorption are computed by comparing these tension profiles with numerical solutions, which consider both bulk diffusion and kinetic desorption processes. The values of the kinetic rate constants of C12E8 obtained from the desorption experiment are nearly the same as that obtained from the clean adsorption study (Lin, S. Y., et al., Langmuir 1996, 12, 6530). The concept that there exists a shift in controlling mechanism from diffusion control at dilute concentration to mixed diffusion-kinetic control at more elevated bulk concentration for C12E8 is therefore confirmed.",

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T1 - Adsorption kinetics of C12E8 at the air-water interface

T2 - Desorption from a compressed interface

AU - Tsay, Ruey Yug

AU - Lin, Shi Yow

AU - Lin, Lung Wei

AU - Chen, Shou I.

PY - 1997/6/11

Y1 - 1997/6/11

N2 - The desorption of C12E8 out of an overcrowded interface due to the sudden shrinkage of a pendant bubble in a quiescent surfactant solution is studied. A video-enhanced pendant bubble tensiometry is utilized for the measurement of the relaxation in surface tension due to the desorption of surfactant. The desorption process is found to be diffusive-kinetic mixed controlled. Rate constants of adsorption/desorption are computed by comparing these tension profiles with numerical solutions, which consider both bulk diffusion and kinetic desorption processes. The values of the kinetic rate constants of C12E8 obtained from the desorption experiment are nearly the same as that obtained from the clean adsorption study (Lin, S. Y., et al., Langmuir 1996, 12, 6530). The concept that there exists a shift in controlling mechanism from diffusion control at dilute concentration to mixed diffusion-kinetic control at more elevated bulk concentration for C12E8 is therefore confirmed.

AB - The desorption of C12E8 out of an overcrowded interface due to the sudden shrinkage of a pendant bubble in a quiescent surfactant solution is studied. A video-enhanced pendant bubble tensiometry is utilized for the measurement of the relaxation in surface tension due to the desorption of surfactant. The desorption process is found to be diffusive-kinetic mixed controlled. Rate constants of adsorption/desorption are computed by comparing these tension profiles with numerical solutions, which consider both bulk diffusion and kinetic desorption processes. The values of the kinetic rate constants of C12E8 obtained from the desorption experiment are nearly the same as that obtained from the clean adsorption study (Lin, S. Y., et al., Langmuir 1996, 12, 6530). The concept that there exists a shift in controlling mechanism from diffusion control at dilute concentration to mixed diffusion-kinetic control at more elevated bulk concentration for C12E8 is therefore confirmed.

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Adsorption kinetics of C¹²E₈ at the air-water interface: Desorption from a compressed interface

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