Hydration of MCM-41 studied by sorption calorimetry
(2007) In Journal of Physical Chemistry C 111(35). p.12906-12913- Abstract
- Hydration of mesoporous silica MCM-41 was studied using the method of sorption calorimetry. By combining water sorption and nitrogen sorption experiments, we calculated the density of silanol groups on the MCM41 surface as 1.6 nm(-2). Comparison of capillary condensation regimes of water and nitrogen showed that the apparent density of water confined in MCM-41 pores is ca. 0.88 g/cm(3). The pore diameter calculated using a combination of X-ray and sorption data is 39 A. Calculations based on application of the Kelvin-Cohan equation on the water sorption data are in reasonable agreement with this value. The sorption calorimetric results show that the capillary condensation of water in the pores is driven by enthalpy; the entropic effect is... (More)
- Hydration of mesoporous silica MCM-41 was studied using the method of sorption calorimetry. By combining water sorption and nitrogen sorption experiments, we calculated the density of silanol groups on the MCM41 surface as 1.6 nm(-2). Comparison of capillary condensation regimes of water and nitrogen showed that the apparent density of water confined in MCM-41 pores is ca. 0.88 g/cm(3). The pore diameter calculated using a combination of X-ray and sorption data is 39 A. Calculations based on application of the Kelvin-Cohan equation on the water sorption data are in reasonable agreement with this value. The sorption calorimetric results show that the capillary condensation of water in the pores is driven by enthalpy; the entropic effect is negative. A mechanism of hydration that involves formation of small unfilled cavities adjacent to pore walls can be used to explain the observed enthalpy end entropy effects. Comparison of sorption and desorption data indicates the presence of air trapped in pores when hydration is performed by mixing MCM-41 with liquid water. The heat effect of pre-capillary condensation adsorption of water on hydroxylated MCM-41 is much more exothermic compared to the original calcined material. (Less)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/687988
- author
- Kocherbitov, Vitaly and Alfredsson, Viveka LU
- organization
- publishing date
- 2007
- type
- Contribution to journal
- publication status
- published
- subject
- in
- Journal of Physical Chemistry C
- volume
- 111
- issue
- 35
- pages
- 12906 - 12913
- publisher
- The American Chemical Society (ACS)
- external identifiers
-
- wos:000249169900007
- scopus:34648820025
- ISSN
- 1932-7447
- DOI
- 10.1021/jp072474r
- language
- English
- LU publication?
- yes
- id
- dfc3e2df-f1db-42bb-aa53-a39a0164aec1 (old id 687988)
- date added to LUP
- 2016-04-01 12:37:34
- date last changed
- 2022-02-04 00:45:14
@article{dfc3e2df-f1db-42bb-aa53-a39a0164aec1,
abstract = {{Hydration of mesoporous silica MCM-41 was studied using the method of sorption calorimetry. By combining water sorption and nitrogen sorption experiments, we calculated the density of silanol groups on the MCM41 surface as 1.6 nm(-2). Comparison of capillary condensation regimes of water and nitrogen showed that the apparent density of water confined in MCM-41 pores is ca. 0.88 g/cm(3). The pore diameter calculated using a combination of X-ray and sorption data is 39 A. Calculations based on application of the Kelvin-Cohan equation on the water sorption data are in reasonable agreement with this value. The sorption calorimetric results show that the capillary condensation of water in the pores is driven by enthalpy; the entropic effect is negative. A mechanism of hydration that involves formation of small unfilled cavities adjacent to pore walls can be used to explain the observed enthalpy end entropy effects. Comparison of sorption and desorption data indicates the presence of air trapped in pores when hydration is performed by mixing MCM-41 with liquid water. The heat effect of pre-capillary condensation adsorption of water on hydroxylated MCM-41 is much more exothermic compared to the original calcined material.}},
author = {{Kocherbitov, Vitaly and Alfredsson, Viveka}},
issn = {{1932-7447}},
language = {{eng}},
number = {{35}},
pages = {{12906--12913}},
publisher = {{The American Chemical Society (ACS)}},
series = {{Journal of Physical Chemistry C}},
title = {{Hydration of MCM-41 studied by sorption calorimetry}},
url = {{http://dx.doi.org/10.1021/jp072474r}},
doi = {{10.1021/jp072474r}},
volume = {{111}},
year = {{2007}},
}