Document Detail


Morphology of air nanobubbles trapped at hydrophobic nanopatterned surfaces.
MedLine Citation:
PMID:  20180525     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
The details of air nanobubble trapping at the interface between water and a nanostructured hydrophobic silicon surface are investigated using X-ray scattering and contact angle measurements. Large-area silicon surfaces containing hexagonally packed, 20 nm wide hydrophobic cavities provide ideal model surfaces for studying the morphology of air nanobubbles trapped inside cavities and its dependence on the cavity depth. Transmission small-angle X-ray scattering measurements show stable trapping of air inside the cavities with a partial water penetration of 5-10 nm into the pores, independent of their large depth variation. This behavior is explained by consideration of capillary effects and the cavity geometry. For parabolic cavities, the liquid can reach a thermodynamically stable configuration-a nearly planar nanobubble meniscus-by partially penetrating into the pores. This microscopic information correlates very well with the macroscopic surface wetting behavior.
Authors:
Antonio Checco; Tommy Hofmann; Elaine DiMasi; Charles T Black; Benjamin M Ocko
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, Non-P.H.S.    
Journal Detail:
Title:  Nano letters     Volume:  10     ISSN:  1530-6992     ISO Abbreviation:  Nano Lett.     Publication Date:  2010 Apr 
Date Detail:
Created Date:  2010-04-14     Completed Date:  2010-07-15     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  101088070     Medline TA:  Nano Lett     Country:  United States    
Other Details:
Languages:  eng     Pagination:  1354-8     Citation Subset:  IM    
Affiliation:
Condensed Matter Physics and Materials Science Department, Brookhaven National Laboratory, Upton, New York 11973, USA. checco@bnl.gov
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MeSH Terms
Descriptor/Qualifier:
Air
Hydrophobicity
Nanostructures / chemistry*
Nanotechnology / methods
Particle Size
Silicon / chemistry*
Surface Properties
Chemical
Reg. No./Substance:
7440-21-3/Silicon

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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