Nucleation and growth of condensate in nanoporous materials

Physical Chemistry Chemical Physics : PCCP
S H Zandavi, C A Ward

Abstract

We consider the adsorption-desorption cycles of water and of three hydrocarbons on MCM-41 and on SBA-15. We show that during the desorption portion of a cycle, when the condensate is still at the mouth of the pores, in equilibrium, and the pressure, P, is the minimum value reached before pore-emptying begins, the contact angle is zero. This value of the contact angle is used with the Kelvin equation to calculate the pore radius of each of the mesoporous silicas considered. The standard deviations in the values are found to differ by only a few percent. We propose a method for predicting the size of adsorbed-molecular clusters that must be formed in the pores to initiate condensate formation there. Once formed, the condensate grows spontaneously to the pore mouth. If the vapour-phase pressure when this condition is reached is also P, the adsorption-desorption cycle is reversible. Three of the eight systems considered meet this condition and their adsorption-desorption cycles are experimentally reversible.

References

Nov 3, 2005·Langmuir : the ACS Journal of Surfaces and Colloids·Annie Grosman, Camille Ortega
Mar 29, 2007·The Journal of Physical Chemistry. B·C A Ward, Jiyu Wu
May 15, 2007·The Journal of Physical Chemistry. B·Jiyu WuC A Ward
Dec 12, 2007·The Journal of Physical Chemistry. B·C A WardA Keshavarz
Sep 2, 2009·The Journal of Physical Chemistry. B·H Ghasemi, C A Ward
Jun 29, 2012·Journal of Physics. Condensed Matter : an Institute of Physics Journal·M ErkoO Paris
Jul 31, 2013·Journal of Colloid and Interface Science·S H Zandavi, C A Ward
Apr 29, 2014·Physical Chemistry Chemical Physics : PCCP·Seyed Hadi Zandavi, Charles A Ward
Oct 30, 2014·Physical Chemistry Chemical Physics : PCCP·Chunmei WuC A Ward

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Citations

Jul 19, 2016·Physical Chemistry Chemical Physics : PCCP·Sima YaghoubianC A Ward
Oct 7, 2016·Physical Chemistry Chemical Physics : PCCP·Seyed Hadi Zandavi, C A Ward
Mar 9, 2017·Physical Chemistry Chemical Physics : PCCP·Bo BaoDavid Sinton
Jul 27, 2017·Physical Chemistry Chemical Physics : PCCP·Sima Yaghoubian, C A Ward
Apr 30, 2020·Physical Chemistry Chemical Physics : PCCP·Xiang WeiYou-Rong Li
Jan 13, 2018·The Journal of Physical Chemistry Letters·Junjie ZhongDavid Sinton
Apr 4, 2018·Langmuir : the ACS Journal of Surfaces and Colloids·Elizabeth BarsottiJin-Hong Chen

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