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The Microscopic Structure of Adsorbed Water on Hydrophobic Surfaces under Ambient Conditions

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. https://resolver.caltech.edu/CaltechAUTHORS:20120130-134629717

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Abstract

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.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1021/nl2036639 DOIArticle
http://pubs.acs.org/doi/abs/10.1021/nl2036639PublisherArticle
ORCID:
AuthorORCID
Heath, James R.0000-0001-5356-4385
Additional Information:© 2011 American Chemical Society. Received: October 17, 2011. Published: November 03, 2011. We thank G. Rossman for assistance in using the Micro Raman spectrometer and the Department of Energy for support (DEFG02-04ER46175).
Funders:
Funding AgencyGrant Number
Department of Energy (DOE)DEFG02-04ER46175
Subject Keywords:Water; adsorption; hydrophobic surfaces; nanodroplets; graphene
Issue or Number:12
Record Number:CaltechAUTHORS:20120130-134629717
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20120130-134629717
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 Letters201111 (12), 5581-5586
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:29026
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:21 Mar 2012 21:02
Last Modified:03 Oct 2019 03:37

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