Author/Authors :
Graupe، نويسنده , , Michael and Koini، نويسنده , , Thomas and Kim، نويسنده , , Hyun I and Garg، نويسنده , , Nupur and Miura، نويسنده , , Yasuhiro F and Takenaga، نويسنده , , Mitsuru and Perry، نويسنده , , Scott S and Lee، نويسنده , , T.Randall، نويسنده ,
Abstract :
Studies of the wettability and friction of self-assembled monolayers (SAMs) generated from the terminally fluorinated alkanethiols (CF3(CH2)nSH, n = 9–15) on gold are reported. These data were compared to those of SAMs generated from the non-fluorinated analogs (CH3(CH2)nSH, n = 9–15). The CF3-terminated SAMs were less wettable by hexadecane and methylene iodide, but surprisingly more wettable by water and glycerol than were the CH3-terminated SAMs. Measurements of friction by atomic force microscopy (AFM) revealed an approximate threefold increase in friction on the CF3-terminated films compared to the CH3-terminated films. A new model for the frictional response of fluorinated SAMs is proposed.
