Sorption calorimetry: Difference between revisions
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The method of sorption calorimetry is designed for studies of hydration of complex organic and biological materials. It has been applied for studies of surfactants<ref>Kocherbitov, V., O. Söderman, and L. Wadsö, Phase Diagram and Thermodynamics of the n-Octyl b-D-Glucoside/Water System. Journal of Physical Chemistry B, 2002. 106(11): p. 2910-2917.</ref>, <ref>Kocherbitov, V. and O. Söderman, Glassy Crystalline State and Water Sorption of Alkyl Maltosides. Langmuir, 2004. 20(8): p. 3056-3061.</ref>, lipids, DNA, nanomaterials<ref>Kocherbitov, V.; Alfredsson, V. Hydration of MCM-41 Studied by Sorption Calorimetry. J. Phys. Chem. C. (2007), 111 (35), 12906-12913. |
The method of sorption calorimetry is designed for studies of hydration of complex organic and biological materials. It has been applied for studies of surfactants<ref>Kocherbitov, V., O. Söderman, and L. Wadsö, Phase Diagram and Thermodynamics of the n-Octyl b-D-Glucoside/Water System. Journal of Physical Chemistry B, 2002. 106(11): p. 2910-2917.</ref>, <ref>Kocherbitov, V. and O. Söderman, Glassy Crystalline State and Water Sorption of Alkyl Maltosides. Langmuir, 2004. 20(8): p. 3056-3061.</ref>, lipids, DNA, nanomaterials<ref>Kocherbitov, V.; Alfredsson, V. Hydration of MCM-41 Studied by Sorption Calorimetry. [http://dx.doi.org/10.1021/jp072474r J. Phys. Chem. C. (2007), 111 (35), 12906-12913].</ref> and other substances. A sorption calorimetric experiment is performed at isothermal regime, but different temperatures can be studied in separate experiments. |
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In a sorption calorimetric experiment, a two-chamber calorimetric cell is incerted into a double-twin microcalorimeter<ref>Wadsö, I. and L. Wadsö, A new method for determination of vapour sorption isotherms using a twin double microcalorimeter. Thermochimica Acta, 1996. 271: p. 179-187</ref>. |
In a sorption calorimetric experiment, a two-chamber calorimetric cell is incerted into a double-twin microcalorimeter<ref>Wadsö, I. and L. Wadsö, A new method for determination of vapour sorption isotherms using a twin double microcalorimeter. Thermochimica Acta, 1996. 271: p. 179-187</ref>. |
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Water evaporates, diffuses through the tube connecting two chambers of the calorimetric cell and is absorbed by the studied substance. From the thermal powers registered in the two chambers one can calculate the partial molar enthalpy of mixing of water. |
Water evaporates, diffuses through the tube connecting two chambers of the calorimetric cell and is absorbed by the studied substance. From the thermal powers registered in the two chambers one can calculate the partial molar enthalpy of mixing of water. |
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During the sorption experiment the water content in the sample increases until it reaches a value high enough to make the process of diffusion of water vapor between the chambers very slow. Then the sorption experiment can be stopped. |
During the sorption experiment the water content in the sample increases until it reaches a value high enough to make the process of diffusion of water vapor between the chambers very slow. Then the sorption experiment can be stopped. |
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For studies of hydration at very high relative humidities we developed a special modification of the method of sorption calorimetry - the desorption calorimetric method <ref>Kocherbitov, V. and L. Wadsö, A Desorption Calorimetric Method for Use at High Water Activities. Thermochimica Acta, 2004. 411(1): p. 31-36.</ref>. A desorption experiment starts with a fully hydrated sample which is placed in the sample chamber (the top chamber in the figure). In the bottom chamber a salt solution is injected. During the desorption experiment the sample is being slowly dehydrated and the salt solution takes up the water evaporated from the sample |
For studies of hydration at very high relative humidities we developed a special modification of the method of sorption calorimetry - the desorption calorimetric method <ref>Kocherbitov, V. and L. Wadsö, A Desorption Calorimetric Method for Use at High Water Activities. Thermochimica Acta, 2004. 411(1): p. 31-36.</ref>. A desorption experiment starts with a fully hydrated sample which is placed in the sample chamber (the top chamber in the figure). In the bottom chamber a salt solution is injected. During the desorption experiment the sample is being slowly dehydrated and the salt solution takes up the water evaporated from the sample |
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==See also== |
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*[http://www.mah.se/sorption http://www.mah.se/sorption ] |
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==References== |
==References== |
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<references/> |
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Revision as of 13:33, 21 November 2009
The method of sorption calorimetry is designed for studies of hydration of complex organic and biological materials. It has been applied for studies of surfactants[1], [2], lipids, DNA, nanomaterials[3] and other substances. A sorption calorimetric experiment is performed at isothermal regime, but different temperatures can be studied in separate experiments.
In a sorption calorimetric experiment, a two-chamber calorimetric cell is incerted into a double-twin microcalorimeter[4]. Water evaporates, diffuses through the tube connecting two chambers of the calorimetric cell and is absorbed by the studied substance. From the thermal powers registered in the two chambers one can calculate the partial molar enthalpy of mixing of water. During the sorption experiment the water content in the sample increases until it reaches a value high enough to make the process of diffusion of water vapor between the chambers very slow. Then the sorption experiment can be stopped.
For studies of hydration at very high relative humidities we developed a special modification of the method of sorption calorimetry - the desorption calorimetric method [5]. A desorption experiment starts with a fully hydrated sample which is placed in the sample chamber (the top chamber in the figure). In the bottom chamber a salt solution is injected. During the desorption experiment the sample is being slowly dehydrated and the salt solution takes up the water evaporated from the sample
See also
References
- ^ Kocherbitov, V., O. Söderman, and L. Wadsö, Phase Diagram and Thermodynamics of the n-Octyl b-D-Glucoside/Water System. Journal of Physical Chemistry B, 2002. 106(11): p. 2910-2917.
- ^ Kocherbitov, V. and O. Söderman, Glassy Crystalline State and Water Sorption of Alkyl Maltosides. Langmuir, 2004. 20(8): p. 3056-3061.
- ^ Kocherbitov, V.; Alfredsson, V. Hydration of MCM-41 Studied by Sorption Calorimetry. J. Phys. Chem. C. (2007), 111 (35), 12906-12913.
- ^ Wadsö, I. and L. Wadsö, A new method for determination of vapour sorption isotherms using a twin double microcalorimeter. Thermochimica Acta, 1996. 271: p. 179-187
- ^ Kocherbitov, V. and L. Wadsö, A Desorption Calorimetric Method for Use at High Water Activities. Thermochimica Acta, 2004. 411(1): p. 31-36.