Chemical Gradients on Graphene To Drive Droplet Motion
ACS Nano2013Vol. 7(6), pp. 4746–4755
Citations Over TimeTop 10% of 2013 papers
Sandra C. Hernández, Charlee J. C. Bennett, Chad E. Junkermeier, Stanislav Tsoi, Francisco J. Bezares, Rory Stine, Jeremy T. Robinson, Evgeniya H. Lock, David R. Boris, Brian D. Pate, Joshua D. Caldwell, T. L. Reinecke, Paul E. Sheehan, Scott G. Walton
Abstract
This work demonstrates the production of a well-controlled, chemical gradient on the surface of graphene. By inducing a gradient of oxygen functional groups, drops of water and dimethyl-methylphosphonate (a nerve agent simulant) are "pulled" in the direction of increasing oxygen content, while fluorine gradients "push" the droplet motion in the direction of decreasing fluorine content. The direction of motion is broadly attributed to increasing/decreasing hydrophilicity, which is correlated to high/low adhesion and binding energy. Such tunability in surface chemistry provides additional capabilities in device design for applications ranging from microfluidics to chemical sensing.
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