Transport in polymer membranes: The concept of ideality, its extensions and applications in vapor sorption and permeation techniques

Kód výsledku v IS VaVaI

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Výsledek na webu

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DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

Transport in polymer membranes: The concept of ideality, its extensions and applications in vapor sorption and permeation techniques

Popis výsledku v původním jazyce

Transport properties of small molecules in polymeric membranes are often determined using the sorption and permeation techniques, and then parameterized in terms of Fick?s law in which constant diffusion coefficient is assumed. However, this idealized approach frequently results in dependencies of mean diffusion coefficients on experimental conditions. In this lecture, we discuss the extensions of Fick?s law in terms of concentration-dependent diffusion, diffusion of binary mixtures and the effect of time-dependent boundary conditions as well as their practical usage in the evaluation of sorption and permeation kinetics. Starting from the experimentally measured kinetics of vapor sorption (or permeation) in a slab of polymer and assuming constant diffusion coefficient, the kinetics can be approximated using the well known solutions of Fick?s second law for the instantaneous change of concentration. Because the time-dependent boundary conditions realized in the apparatus affect the kine

Název v anglickém jazyce

Transport in polymer membranes: The concept of ideality, its extensions and applications in vapor sorption and permeation techniques

Popis výsledku anglicky

Transport properties of small molecules in polymeric membranes are often determined using the sorption and permeation techniques, and then parameterized in terms of Fick?s law in which constant diffusion coefficient is assumed. However, this idealized approach frequently results in dependencies of mean diffusion coefficients on experimental conditions. In this lecture, we discuss the extensions of Fick?s law in terms of concentration-dependent diffusion, diffusion of binary mixtures and the effect of time-dependent boundary conditions as well as their practical usage in the evaluation of sorption and permeation kinetics. Starting from the experimentally measured kinetics of vapor sorption (or permeation) in a slab of polymer and assuming constant diffusion coefficient, the kinetics can be approximated using the well known solutions of Fick?s second law for the instantaneous change of concentration. Because the time-dependent boundary conditions realized in the apparatus affect the kine

Druh

D - Stať ve sborníku

CEP obor

CF - Fyzikální chemie a teoretická chemie

OECD FORD obor

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Projekt

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Návaznosti

Z - Vyzkumny zamer (s odkazem do CEZ)<br>S - Specificky vyzkum na vysokych skolach

Rok uplatnění

2010

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název statě ve sborníku

CHISA 2010

ISBN

978-80-02-02210-7

ISSN

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e-ISSN

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Počet stran výsledku

1

Strana od-do

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Název nakladatele

Process Engineering Publisher, Novosad, J.

Místo vydání

Praha

Místo konání akce

Praha

Datum konání akce

1. 1. 2010

Typ akce podle státní příslušnosti

WRD - Celosvětová akce

Kód UT WoS článku

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