Abstract
FAS-17 (CF3(CF2)7(CH2)2Si(OCH3)3) and PEG (H(OCH2CH2)nOH) were always used for modifying surfaces for superhydrophobicity and superhydrophilicity, respectively. In order to understand the wetting property and durability of aluminum surface, the interactions between FAS-17/PEG and surface were investigated. The adsorption/dissociation mechanism of FAS-17/PEG on Al-terminated α-Al2O3(0001) surface have been studied with the DFT method. The 1,2-dissociation products of FAS-17 and PEG are more stable than the 1,4-dissociation products on the dry surface. The products on the dry surface are more stable than on the hydroxylated surface, which explains the phenomenon that the durability of superhydrophobicity decreased dramatically in wet environment. The dissociated FAS-17 molecules are stable on the 1,2-hydroxylated surface when the coverage is up to 50%. A layer of air appears to be trapped at the surface/modifier interface which is prerequisite for superhydrophobicity.
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