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Saleema, N; Sarkar, D. K; Gallant, D; Paynter, R. W; Chen, X.-G
ACS applied materials & interfaces, 12/2011, Volume: 3, Issue: 12Journal Article
Various surface characterization techniques were used to study the modified surface chemistry of superhydrophobic aluminum alloy surfaces prepared by immersing the substrates in an aqueous solution containing sodium hydroxide and fluoroalkyl-silane (FAS-17) molecules. The creation of a rough micronanostructure on the treated surfaces was revealed by scanning electron microscopy (SEM). X-ray photoelectron spectroscopy (XPS) and infrared reflection absorption spectroscopy (IRRAS) confirmed the presence of low surface energy functional groups of fluorinated carbon on the superhydrophobic surfaces. IRRAS also revealed the presence of a large number of OH groups on the hydrophilic surfaces. A possible bonding mechanism of the FAS-17 molecules with the aluminum alloy surfaces has been suggested based on the IRRAS and XPS studies. The resulting surfaces demonstrated water contact angles as high as ∼166° and contact angle hystereses as low as ∼4.5°. A correlation between the contact angle, rms roughnesses, and the chemical nature of the surface has been elucidated.
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