Cao, Peigen and Xu, Ke and Varghese, Joseph O. and Heath, James R. (2011) The Microscopic Structure of Adsorbed Water on Hydrophobic Surfaces under Ambient Conditions. Nano Letters, 11 (12). pp. 5581-5586. ISSN 1530-6984 http://resolver.caltech.edu/CaltechAUTHORS:20120113-111313327
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The interaction of water vapor with hydrophobic surfaces is poorly understood. We utilize graphene templating to preserve and visualize the microscopic structures of adsorbed water on hydrophobic surfaces. Three well-defined surfaces [H–Si(111), graphite, and functionalized mica] were investigated, and water was found to adsorb as nanodroplets (~10–100 nm in size) on all three surfaces under ambient conditions. The adsorbed nanodroplets were closely associated with atomic-scale surface defects and step-edges and wetted all the hydrophobic substrates with contact angles <~10°, resulting in total water adsorption that was similar to what is found for hydrophilic surfaces. These results point to the significant differences between surface processes at the atomic/nanometer scales and in the macroscopic world.
|Additional Information:||© 2011 American Chemical Society. Received: October 17, 2011. Publication Date (Web): November 3, 2011. We thank G. Rossman for assistance in using the Micro Raman spectrometer and the Department of Energy for support (DE-FG02-04ER46175).|
|Subject Keywords:||Water, adsorption, hydrophobic surfaces, nanodroplets, graphene|
|Official Citation:||The Microscopic Structure of Adsorbed Water on Hydrophobic Surfaces under Ambient Conditions Peigen Cao, Ke Xu, Joseph O. Varghese, and James R. Heath Nano Letters 2011 11 (12), 5581-5586|
|Usage Policy:||No commercial reproduction, distribution, display or performance rights in this work are provided.|
|Deposited By:||Ruth Sustaita|
|Deposited On:||13 Jan 2012 19:32|
|Last Modified:||26 Dec 2012 14:41|
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