From superhydrophilic to superhydrophobic surfaces by means of polymeric Layer-by-Layer films

Lopez-Torres, Diego, Elosua, Cesar, Hernaez, Miguel, Goicoechea, Javier and Arregui, Francisco J. (2015) From superhydrophilic to superhydrophobic surfaces by means of polymeric Layer-by-Layer films. Applied Surface Science, 351. pp. 1081-1086. ISSN 0169-4332

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In this paper a nanocoating that shows a superhydrophilic behavior (with a contact angle close to 0°) is transformed into a superhydrophobic nanofilm (whose contact angle is 165°) following a procedure that needs no nanoparticles to generate the nano-roughness required for superhydrophobicity. The superhydrophilic nanocoating was fabricated using poly (allylamine hydrochloride) (PAH) and poly (sodium phosphate) (PSP) combined by means of the Layer-by-Layer (LbL) technique. Seven different nanocoatings were constructed with different number of bilayers (4, 8, 12, 16, 20, 30 and 40) being the concentration of both polymers 10 −3  M. The analysis was conducted studying three different features: roughness, thickness and contact angle. The results show that initially, the contact angle of the nanofilms above 20 bilayers is close to 0°, that is, the minimum value for a superhydrophilic coating. These surfaces were functionalized using 1H,1H,2H,2H-Perfluorodecyltriethoxsilane to transform them into hydrophobic coatings by Chemical Vapor Disposition (CVD). Thereafter, the nanofilms showed a superhydrophobic behavior with a contact angle of 165° for the 40 bilayers films. The results of roughness and the images of AFM prove that the morphology of the nanocoating is preserved.

Item Type: Article
Uncontrolled Keywords: cvd technique,functionalized surfaces,hydrophilic and hydrophobic films,layer-by-layer,psp-pah,chemistry(all),condensed matter physics,physics and astronomy(all),surfaces and interfaces,surfaces, coatings and films ,/dk/atira/pure/subjectarea/asjc/1600
Faculty \ School:
Faculty of Science > School of Chemistry
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Depositing User: LivePure Connector
Date Deposited: 09 Apr 2020 00:50
Last Modified: 22 Apr 2020 08:47
DOI: 10.1016/j.apsusc.2015.06.004

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