【摘 要】
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The layer-by-layer(LbL)electrostatic assembly technique has become a relatively mature and effective method for fabrication of functional thin films and surface modification.By direct assembly of biom
【机 构】
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State Key Laboratory of Polymer Physics and Chemistry,Changchun Institute of Applied Chemistry,Chine
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The layer-by-layer(LbL)electrostatic assembly technique has become a relatively mature and effective method for fabrication of functional thin films and surface modification.By direct assembly of biomacromolecules into multilayers via charge interactions,we can tune the surface properties of the substrates.Generally for as-assembled polyelectrolyte multilayers,charges on the polycation and the polyanion balance each other,and the salt ions only reside at the surface as the counterions for the excess charges on the polyelectrolyte last deposited.By taking advantage of the counterions at the surface of the LbL assemblies,we apply the ion exchange chemistry to multilayers to modulate the surface wetting properties.We show that the surface wettability can be tuned rapidly and reversibly from superhydrophilic to superhydrophobic,and completely erasable and rewritable gradient wettability can be achieved using this approach.
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