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A desorption calorimetric method for use at high water activities

Kocherbitov, Vitaly LU and Wadsö, Lars LU (2004) In Thermochimica Acta 411(1). p.31-36
Abstract
This paper presents a microcalorimetric technique to simultaneously measure water activity and enthalpy of mixing (differential heat of sorption) as functions of composition at high water activities. The instrument consists of a sorption vessel in a double twin microcalorimeter. A sample at high water activity is placed in one chamber of the vessel and an unsaturated salt solution is injected into another chamber. A tube connects the chambers and diffusion will cause the water in the sample to be desorbed and condensed in the salt solution. As the rate of diffusion is high when the sample is at high water activity it is possible to make detailed studies of phenomena taking place at high water activity. The method has been tested on the... (More)
This paper presents a microcalorimetric technique to simultaneously measure water activity and enthalpy of mixing (differential heat of sorption) as functions of composition at high water activities. The instrument consists of a sorption vessel in a double twin microcalorimeter. A sample at high water activity is placed in one chamber of the vessel and an unsaturated salt solution is injected into another chamber. A tube connects the chambers and diffusion will cause the water in the sample to be desorbed and condensed in the salt solution. As the rate of diffusion is high when the sample is at high water activity it is possible to make detailed studies of phenomena taking place at high water activity. The method has been tested on the system dimethyldodecylamine oxide (DDAO)-water. (C) 2003 Elsevier B.V. All rights reserved. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Sorption calorimetry, Desorption, Water activity, Enthalpy of mixing, Differential heat of sorption, Surfactants
in
Thermochimica Acta
volume
411
issue
1
pages
31 - 36
publisher
Elsevier
external identifiers
  • wos:000188704900006
  • scopus:0742306769
ISSN
0040-6031
DOI
10.1016/j.tca.2003.07.007
language
English
LU publication?
yes
id
5e11397d-739b-4e27-a89a-3a8c35b68105 (old id 153733)
date added to LUP
2007-07-11 14:42:51
date last changed
2017-01-01 07:25:55
@article{5e11397d-739b-4e27-a89a-3a8c35b68105,
  abstract     = {This paper presents a microcalorimetric technique to simultaneously measure water activity and enthalpy of mixing (differential heat of sorption) as functions of composition at high water activities. The instrument consists of a sorption vessel in a double twin microcalorimeter. A sample at high water activity is placed in one chamber of the vessel and an unsaturated salt solution is injected into another chamber. A tube connects the chambers and diffusion will cause the water in the sample to be desorbed and condensed in the salt solution. As the rate of diffusion is high when the sample is at high water activity it is possible to make detailed studies of phenomena taking place at high water activity. The method has been tested on the system dimethyldodecylamine oxide (DDAO)-water. (C) 2003 Elsevier B.V. All rights reserved.},
  author       = {Kocherbitov, Vitaly and Wadsö, Lars},
  issn         = {0040-6031},
  keyword      = {Sorption calorimetry,Desorption,Water activity,Enthalpy of mixing,Differential heat of sorption,Surfactants},
  language     = {eng},
  number       = {1},
  pages        = {31--36},
  publisher    = {Elsevier},
  series       = {Thermochimica Acta},
  title        = {A desorption calorimetric method for use at high water activities},
  url          = {http://dx.doi.org/10.1016/j.tca.2003.07.007},
  volume       = {411},
  year         = {2004},
}