Chemical Gradients on Graphene to Drive Droplet Motion
NAVAL RESEARCH LAB WASHINGTON DC
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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 increasingdecreasing hydrophilicity, which is correlated to highlow adhesion and binding energy. Such tunability in surface chemistry provides additional capabilities in device design for applications ranging from microfluidics to chemical sensing.
- Inorganic Chemistry
- Organic Chemistry
- Physical Chemistry
- Nuclear Physics and Elementary Particle Physics