▁a ▁water ▁contact ▁angle ▁even ▁greater ▁than ▁ 1 5 0 ° , ▁due ▁to ▁the ▁presence ▁of ▁air ▁po ckets ▁under ▁the ▁liquid ▁drop . ▁These ▁are ▁called ▁super h ydro ph ob ic ▁surfaces . ▁ ▁If ▁the ▁contact ▁angle ▁is ▁measured ▁through ▁the ▁gas ▁instead ▁of ▁through ▁the ▁liquid , ▁then ▁it ▁should ▁be ▁replaced ▁by ▁ 1 8 0 ° ▁minus ▁their ▁given ▁value . ▁Contact ▁angles ▁are ▁equally ▁applicable ▁to ▁the ▁interface ▁of ▁two ▁liqu ids , ▁though ▁they ▁are ▁more ▁commonly ▁measured ▁in ▁solid ▁products ▁such ▁as ▁non - st ick ▁p ans ▁and ▁water proof ▁fab rics . ▁ ▁Control ▁of ▁contact ▁angles ▁Control ▁of ▁the ▁wet ting ▁contact ▁angle ▁can ▁often ▁be ▁achieved ▁through ▁the ▁de position ▁or ▁incorpor ation ▁of ▁various ▁organ ic ▁and ▁in organ ic ▁mole cules ▁onto ▁the ▁surface . ▁This ▁is ▁often ▁achieved ▁through ▁the ▁use ▁of ▁special ty ▁sil ane ▁chemical s ▁which ▁can ▁form ▁a ▁S AM ▁( self - ass emble d ▁mon ol ay ers ) ▁layer . ▁With ▁the ▁proper ▁selection ▁of ▁the ▁organ ic ▁mole cules ▁with ▁varying ▁mole cular ▁structures ▁and ▁amounts ▁of ▁hydro car bon ▁and / or ▁per flu or on ated ▁termin ations , ▁the ▁contact ▁angle ▁of ▁the ▁surface ▁can ▁t une . ▁The ▁de position ▁of ▁these ▁special ty ▁sil anes ▁can ▁be ▁achieved ▁in ▁the ▁gas ▁phase ▁through ▁the ▁use ▁of ▁a ▁special ized ▁vac u um ▁o vens ▁or ▁liquid - phase ▁process . ▁M ole