NDLI: Melting behavior of water in cylindrical pores: carbon nanotubes and silica glasses

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Sliwinska-Bartkowiak, M. Jazdzewska, M. Huang, L. L. Gubbins, K. E.
Description	Country affiliation: Poland Author Affiliation: Sliwinska-Bartkowiak M ( Institute of Physics, Adam Mickiewicz University, Umultowska 85, Poznan, Poland. msb@amu.edu.pl)
Abstract	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.
File Format	HTM / HTML
ISSN	14639076
Issue Number	32
Journal	Physical Chemistry Chemical Physics
Volume Number	10
e-ISSN	14639084
Language	English
Publisher	Royal Society of Chemistry
Publisher Date	2008-08-28
Publisher Place	Great Britain (UK)
Access Restriction	Subscribed
Subject Keyword	Discipline Physics Discipline Biophysics Discipline Chemistry
Content Type	Text
Resource Type	Article
Subject	Physics and Astronomy Physical and Theoretical Chemistry

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