For the making of the super hydrophobic surface, we need contact angle greater than 150 degrees. For that which silane gives the best contact angle? how will NH2 affect the hydrophobic character IF a silane with NH2 is used? like amino propyl tri methoxy silane or 3 amino propyl tril methoxy silane
By my experience fluorosilane are this compound. This may interest you:
http://www.sciencedirect.com/science/article/pii/S0169433216312272
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Alkyl and fluoro end groups are expected to increase the water contact angle. This effect could be optimized by combining chemical grafting to proper surface coverage and roughness. As compared, the contact angle of amino end group coating is expected to be lower (for water) and affected by the pH. Using amino silane, the coating obtained could depend on the nature of the substrate and grafting conditions (eg http://www.jeos.org/index.php/jeos_rp/article/viewFile/13075/1118 vs http://pubs.acs.org/doi/pdf/10.1021/am3015923)
Well, hydrodroxymethyldisiloxane HMDSO is evergreen precursor for superhydrophobic layers deposition. Organosilicon nature of plasma deposited HMDSO guarantees the superhydrophobic nature. Then you can play with the roghbess of the coating and by increasin Ra you obtain higher WCA. The presense of amine group decrease the superhydrophobicity and WCA, because NH2 Is hydrophylic group. Look to some of my papers. APMS OR APTES are not good precursors for superhydrophobic layers deposition. The addition of fluorine will increase WCA for sure but I have concerns regarding the toxicity of such precursors.
Article Determination of NH2 concentration on 3-aminopropyl tri-etho...
You may look also to this publucation
Article Plasma Enhanced CVD of Organosilicon Thin Films on Electrosp...
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