Equilibrium adsorption on single and aggregated nanospheres.
The mean field density functional theory has been used to explore Ar adsorption onto single and double identical carbon dioxide nanospheres. We have studied adsorption from subsaturation up to saturation at several temperatures. For the single sphere case, the adsorption excesses and density profiles approach those of plane cases as the spherical substrate size increases; at each temperature, the transition from thin-film to thick-film adsorption is strongly dependent on the size of substrate and the adsorption behavior approaches to that of a plane when the substrate size goes to a large value. For the double sphere case, the cluster formed within the region analogous to the pendular region formed by two contacting identical nanospheres of radius of 1.7 nm has also been studied. The two sphere structure favorites the cluster forming in the interstitial region but does not affect the adsorption transition.
Nie
Chu
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Department of Nuclear Engineering, Texas A&M University, College Station, TX 77843, USA. niechu@hotmail.com
Marlow
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