Melting and freezing of argon in a granular packing of linear mesopore arrays

Details Melting and freezing of argon in a granular packing of linear mesopore arrays Melting and freezing of argon in a granular packing of linear mesopore arrays

2008-03-29

arxiv.org/abs/0803.4256v1

Physics

Chemical Physics

4 pages, 4 figures, to appear as a Letter in Physical Review Letters

Scientific paper

10.1103/PhysRevLett.100.175701

Freezing and melting of Ar condensed in a granular packing of template-grown arrays of linear mesopores (SBA-15, mean pore diameter 8 nanometer) has been studied by specific heat measurements C as a function of fractional filling of the pores. While interfacial melting leads to a single melting peak in C, homogeneous and heterogeneous freezing along with a delayering transition for partial fillings of the pores result in a complex freezing mechanism explainable only by a consideration of regular adsorption sites (in the cylindrical mesopores) and irregular adsorption sites (in niches of the rough external surfaces of the grains, and at points of mutual contact of the powder grains). The tensile pressure release upon reaching bulk liquid/vapor coexistence quantitatively accounts for an upward shift of the melting/freeezing temperature observed while overfilling the mesopores.

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