Document Detail

Contact of Oil with Solid Surfaces in Aqueous Media Probed Using Sum Frequency Generation Spectroscopy.
MedLine Citation:
PMID:  22206274     Owner:  NLM     Status:  Publisher    
We have studied the interface between a hexadecane drop and a sapphire substrate in water using infrared-visible sum frequency generation spectroscopy (SFG). At high pH and above the isoelectric point (IEP) of the sapphire substrate, the hexadecane drop is repelled due to electrostatic forces. The SFG measurements are consistent with the observation that a thick layer of water is present between the hexadecane and the sapphire substrate. Below the IEP of the sapphire substrate, the hexadecane drops stick to the sapphire surface and, surprisingly, the SFG results show presence of a thin layer of water between hexadecane drop and the sapphire substrate. Presence of interfacial water below the IEP can be explained due to weaker repulsive electrostatic forces and attractive van der Waals interactions. These results are important in understanding adhesion of non-polar species in aqueous media.
Ping Yuan Hsu; Ali Dhinojwala
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2011-12-28
Journal Detail:
Title:  Langmuir : the ACS journal of surfaces and colloids     Volume:  -     ISSN:  1520-5827     ISO Abbreviation:  -     Publication Date:  2011 Dec 
Date Detail:
Created Date:  2011-12-30     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9882736     Medline TA:  Langmuir     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
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