Use of stimuli responsive polymers grafted on mixed self-assembled monolayers to tune transitions in surface energy
A method to tune and reversibly switch surface wettability by making use of smart polymers attached to self-assembled monolayers (SAMs) that vary systematically in their composition and, thus, hydrophobicity and surface energy is presented. As such, the development of a technique for surface polymerization of PNIPAAm using SAMs containing carboxylic acid-terminated alkanethiolates on gold which are derivatized with an amine-bearing azo-initiator is reported. It is demonstrated that, by varying the ratio of the carboxylic acid- to methyl-terminated alkanethiolates in the underlying SAM, the wettability, and thus the surface energy, can be tuned in both the hydrophilic and hydrophobic states of the surface grafted polymer.
Mendez, S; Ista, LK; López, GP
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