Abstract
Surfaces with controlled oil wettability in water have great potential for numerous underwater applications. In this work, we proposed two schemes, alkyl chain length dependent and ionic strength dependent, to achieve controllable oelophobic surfaces. The underwater oil-resistant property of the obtained self-assembled monolayers (SAMs) was evaluated by using an oil droplet (1,2-dichloroethane) as a detecting probe. The oleophobicity of SAM surfaces could be modulated from superoleophilic (contact angle of ca. 0°) to superoleophobic (contact angle over 170°) by controlling the chain length difference between negatively charged HS(CH2)nCOO–-SAM (n = 17, 16, 14, 12, 10, 8, 6, 4) and positively charged HS(CH2)5N(CH3)3+-SAM. The observed phenomena could be explained by interchain interactions between charged −N(CH3)3+ and −COO–, in addition with the bending effect of the long chain in mixed-charged (pseudozwitterionic) SAMs. Furthermore, the effect of ionic strength on mixed-charged SAMs (negatively charged H...
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