Time lag for transmembrane transport without interface equilibrium

Zhang, Y.K.; Kocherginsky, N.M.

doi:10.1016/j.memsci.2003.08.008

Cited by 11 publications

(1 citation statement)

References 29 publications

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“…At time t 40, the upstream side is exposed to a gas or vapor at a specified pressure p A0 and equilibrium between the gas phase and the membrane phase is established instantaneously. However, the latter may not always be the case [5,6]. The gas molecules sorbed into the highpressure side of the film subsequently diffuse to the opposite vacuum/low-pressure side of the film (downstream).…”

Section: Introductionmentioning

confidence: 99%

A shortcut method for faster determination of permeability coefficient from time lag experiments

Al-Ismaily

Wijmans

Kruczek

2012

Journal of Membrane Science

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Section: Introductionmentioning

confidence: 99%

A shortcut method for faster determination of permeability coefficient from time lag experiments

Al-Ismaily

Wijmans

Kruczek

2012

Journal of Membrane Science

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The effect of mass transfer resistance and nonuniform initial solvent concentration on permeation through polymer membranes

Zielinski

Altınkaya

2017

J of Applied Polymer Sci

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A numerical simulation model has been developed which enables one to examine the effects of surface mass transfer resistance on the evaluation of permeation (P*), diffusion (D), and solubility (S) coefficients from unsteady-state mass transfer experiments as well as the transmission rate. A complementary analytical expression has been developed which validates the numerical model and facilitates the evaluation of the concentration dependence of P*, D, and S from sequential step-change experiments, under experimental conditions when the surface mass transfer resistance can be neglected.

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Preliminary studies of using preheated carrier gas for on-line membrane extraction of semivolatile organic compounds

Liu

Pawliszyn

2007

Anal Bioanal Chem

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In this paper, we present results for the on-line determination of semivolatile organic compounds (SVOCs) in air using membrane extraction with a sorbent interface-ion mobility spectrometry (MESI-IMS) system with a preheated carrier (stripping) gas. The mechanism of the mass transfer of SVOCs across a membrane was initially studied. In comparison with the extraction of volatile analytes, the mass transfer resistance that originated from the slow desorption from the internal membrane surface during the SVOC extraction processes should be taken into account. A preheated carrier gas system was therefore built to facilitate desorption of analytes from the internal membrane surface. With the benefit of a temperature gradient existing between the internal and external membrane surfaces, an increase in the desorption rate of a specific analyte at the internal surface and the diffusion coefficient within the membrane could be achieved while avoiding a decrease of the distribution constant on the external membrane interface. This technique improved both the extraction rate and response times of the MESI-IMS system for the analysis of SVOCs. Finally, the MESI-IMS system was shown to be capable of on-site measurement by monitoring selected polynuclear aromatic hydrocarbons emitted from cigarette smoke.

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Time lag for transmembrane transport without interface equilibrium

Cited by 11 publications

References 29 publications

A shortcut method for faster determination of permeability coefficient from time lag experiments

A shortcut method for faster determination of permeability coefficient from time lag experiments

The effect of mass transfer resistance and nonuniform initial solvent concentration on permeation through polymer membranes

Preliminary studies of using preheated carrier gas for on-line membrane extraction of semivolatile organic compounds

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