Computer Science
Scientific paper
Jan 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993phdt........42f&link_type=abstract
Thesis (PH.D.)--UNIVERSITY OF WASHINGTON, 1993.Source: Dissertation Abstracts International, Volume: 54-06, Section: B, page: 31
Computer Science
Scientific paper
This thesis project work was initiated to understand the surface melting of ice at a foreign solid substrate. The primary technique employed is to measure the dielectric constants using the time domain reflectometry (TDR). The samples are prepared by condensing purified water in various porous media, including monosized spherical powders, flaky powders, exfoliated graphite and natural soils. The samples are frozen and measurements are taken as the samples warm up towards the bulk melting point of ice. Premelting of ice is observed for all samples tested. The water fraction at a given temperature is found to depend on various factors including the size and shape of powder particles, porosity of packing, impurity level, etc. As a complementary method, mercury porosimetry is employed to characterize the pore structure of porous media and water fraction is deduced by relating the mercury pressure to the temperature depression. Impurity effect may be qualitatively revealed by comparing the results from mercury porosimetry to those from TDR measurement. A theoretical calculation of the premelting of the ice in monosized spherical powders attributes the water fraction to premelting due to van der Waals interactions and curvature effect, and an excellent agreement with the TDR measurement is found. Neutron diffraction is also used to study the premelting of ice in exfoliated graphite. An orientationally epitaxial growth of ice on the basal plane of graphite is identified and the finite size effect on ice premelting is found important in such a case.
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