Document Detail


Enormous Lattice Expansion of Hummers Graphite Oxide in Alcohols at Low Temperatures.
MedLine Citation:
PMID:  23297717     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
A structural study of swelling of Hummers graphite oxide (H-GO) in excess of liquid alcohols was performed as a function of temperature using synchrotron X-ray diffraction and revealed a strong "negative thermal expansion" effect. The increase of the distance between graphene oxide layers is explained by insertion of additional solvent upon cooling of the H-GO/solvent system. The inter-layer distance of H-GO is found to increase gradually upon temperature decrease, reaching 19.4Å and 20.6Å at 140K for methanol and ethanol, respectively. The gradual expansion of the H-GO lattice upon cooling corresponds to insertion of at least two additional solvent monolayers and can be described as osmotic swelling. This phenomenon is strongly different from the solvation of Brodie graphite oxide (B-GO) which was found earlier to exhibit crystalline swelling: single-step insertion of an additional solvent monolayer at low temperatures. The enormous structural expansion of H-GO at low temperatures is suggested to be useful for solution based intercalation of graphite oxide with relatively large molecules and the synthesis of various composite materials.
Authors:
Shujie You; Bertil Sundqvist; Alexandr V Talyzin
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2013-1-8
Journal Detail:
Title:  ACS nano     Volume:  -     ISSN:  1936-086X     ISO Abbreviation:  ACS Nano     Publication Date:  2013 Jan 
Date Detail:
Created Date:  2013-1-9     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  101313589     Medline TA:  ACS Nano     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
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