| Melting behavior of water in cylindrical pores: carbon nanotubes and silica glasses. | |
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MedLine Citation:
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PMID: 18688535 Owner: NLM Status: PubMed-not-MEDLINE |
Abstract/OtherAbstract:
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We report a study of the effects of confinement in multi-walled carbon nanotubes and mesoporous silica glasses (SBA-15) on the solid structure and melting of both H(2)O and D(2)O ice, using differential scanning calorimetry, dielectric relaxation spectroscopy, and neutron diffraction. Multi-walled nanotubes of 2.4, 3.9 and 10 nm are studied, and the SBA-15 studied has pores of mean diameter 3.9 nm; temperatures ranging from approximately 110 to 290 K were studied. We find that the melting point is depressed relative to the bulk water for all systems studied, with the depression being greater in the case of the silica mesopores. These results are shown to be consistent with molecular simulation studies of freezing in silica and carbon materials. The neutron diffraction data show that the cubic phase of ice is stabilized by the confinement in carbon nanotubes, as well as in silica mesopores, and persists up to temperatures of about 240 K, above which there is a transition to the hexagonal ice structure. |
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Authors:
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M Sliwinska-Bartkowiak; M Jazdzewska; L L Huang; K E Gubbins |
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Publication Detail:
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Type: Journal Article Date: 2008-07-16 |
Journal Detail:
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Title: Physical chemistry chemical physics : PCCP Volume: 10 ISSN: 1463-9076 ISO Abbreviation: Phys Chem Chem Phys Publication Date: 2008 Aug |
Date Detail:
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Created Date: 2008-08-08 Completed Date: 2008-10-10 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 100888160 Medline TA: Phys Chem Chem Phys Country: England |
Other Details:
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Languages: eng Pagination: 4909-19 Citation Subset: - |
Affiliation:
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Institute of Physics, Adam Mickiewicz University, Umultowska 85, Poznan, Poland. msb@amu.edu.pl |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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