Freezing and melting transitions of liquids in mesopores with ink-bottle geometry

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Khokhlov, Alexey; Valiullin, Rustem; Kaerger, Joerg; Steinbach, Frank; Feldhoff, Armin: Freezing and melting transitions of liquids in mesopores with ink-bottle geometry. In: New Journal of Physics 9 (2007), 272. DOI:

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Freezing and melting behavior of nitrobenzene in mesoporous silicon with different pore size and with different porous structure have been studied using H-1 NMR cryoporometry. With the bulk phase surrounding the porous monoliths, in materials with uniform channel-like pores distinct pore-size-dependent freezing and melting transitions have been measured. These data were further used for the analysis of the fluid behavior in samples with modulated porous structure, namely linear pores with alternating cross-section. We have, in particular, considered two materials consisting of channel sections, which were separated by almost identical channel `necks' but notably differed in the respective channel diameters. In the smaller channel segments, the observed shift in the freezing temperature provides direct evidence of the relevance of a pore-blocking mechanism, i.e. of the retardation in the propagation of a solid front by the channel necks. In the channel segments with larger diameter, on the other hand, freezing is found to be initiated by homogeneous nucleation.
License of this version: CC BY-NC-SA 3.0 Unported
Document Type: article
Publishing status: publishedVersion
Issue Date: 2007
Appears in Collections:Naturwissenschaftliche Fakultät

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1 image of flag of Germany Germany 227 86.31%
2 image of flag of United States United States 11 4.18%
3 image of flag of China China 7 2.66%
4 image of flag of United Kingdom United Kingdom 3 1.14%
5 image of flag of Poland Poland 2 0.76%
6 image of flag of India India 1 0.38%
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    other countries 8 3.04%

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