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Issue 32, 2008
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Melting behavior of water in cylindrical pores: carbon nanotubes and silica glasses

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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 H2O and D2O 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.

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

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Publication details

The article was received on 15 May 2008, accepted on 27 Jun 2008 and first published on 16 Jul 2008


Article type: Paper
DOI: 10.1039/B808246D
Citation: Phys. Chem. Chem. Phys., 2008,10, 4909-4919
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    Melting behavior of water in cylindrical pores: carbon nanotubes and silica glasses

    M. Sliwinska-Bartkowiak, M. Jazdzewska, L. L. Huang and K. E. Gubbins, Phys. Chem. Chem. Phys., 2008, 10, 4909
    DOI: 10.1039/B808246D

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