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Coupled transport processes in responding membranes: the case of a single gradient

Åberg, Christoffer LU and Wennerström, Håkan LU (2009) In Physical Chemistry Chemical Physics 11(40). p.9075-9081
Abstract
We present a theoretical study of two coupled diffusion processes through a membrane which is able to respond to the presence of the diffusing substances with a phase change. The case we consider is when the direct driving force for one of the processes vanishes, i.e. when the chemical potential of one of the components, or some other intensive variable, is kept equal in the two reservoirs surrounding the membrane. The coupling of the two transport processes results in nonzero gradients inside the membrane also for the variable that is equal in the two reservoirs. There is a concomitant change in the phase coexistence compared to the behaviour expected if only

considering the external conditions. The transport properties of the... (More)
We present a theoretical study of two coupled diffusion processes through a membrane which is able to respond to the presence of the diffusing substances with a phase change. The case we consider is when the direct driving force for one of the processes vanishes, i.e. when the chemical potential of one of the components, or some other intensive variable, is kept equal in the two reservoirs surrounding the membrane. The coupling of the two transport processes results in nonzero gradients inside the membrane also for the variable that is equal in the two reservoirs. There is a concomitant change in the phase coexistence compared to the behaviour expected if only

considering the external conditions. The transport properties of the two phases within the membrane have to be different for this effect to occur, but otherwise the prerequisites are rather general. An analogous effect is expected for the case of coupled diffusion and heat conduction. Amphiphilic systems or biological membranes often show large changes in structure and transport properties due to small variations in thermodynamic variables such as temperature, the osmotic pressure of the solvent or the presence of cosolvents and cosolutes. The effects we find are therefore particularly relevant to these systems. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Physical Chemistry Chemical Physics
volume
11
issue
40
pages
9075 - 9081
publisher
Royal Society of Chemistry
external identifiers
  • wos:000270698900013
  • scopus:70350011740
ISSN
1463-9084
DOI
10.1039/b909187d
language
English
LU publication?
yes
id
26444a31-906a-4628-876c-41c40d8c135e (old id 1453957)
date added to LUP
2009-10-26 13:00:14
date last changed
2017-01-01 06:09:32
@article{26444a31-906a-4628-876c-41c40d8c135e,
  abstract     = {We present a theoretical study of two coupled diffusion processes through a membrane which is able to respond to the presence of the diffusing substances with a phase change. The case we consider is when the direct driving force for one of the processes vanishes, i.e. when the chemical potential of one of the components, or some other intensive variable, is kept equal in the two reservoirs surrounding the membrane. The coupling of the two transport processes results in nonzero gradients inside the membrane also for the variable that is equal in the two reservoirs. There is a concomitant change in the phase coexistence compared to the behaviour expected if only<br/><br>
considering the external conditions. The transport properties of the two phases within the membrane have to be different for this effect to occur, but otherwise the prerequisites are rather general. An analogous effect is expected for the case of coupled diffusion and heat conduction. Amphiphilic systems or biological membranes often show large changes in structure and transport properties due to small variations in thermodynamic variables such as temperature, the osmotic pressure of the solvent or the presence of cosolvents and cosolutes. The effects we find are therefore particularly relevant to these systems.},
  author       = {Åberg, Christoffer and Wennerström, Håkan},
  issn         = {1463-9084},
  language     = {eng},
  number       = {40},
  pages        = {9075--9081},
  publisher    = {Royal Society of Chemistry},
  series       = {Physical Chemistry Chemical Physics},
  title        = {Coupled transport processes in responding membranes: the case of a single gradient},
  url          = {http://dx.doi.org/10.1039/b909187d},
  volume       = {11},
  year         = {2009},
}