Details
| Original language | English |
|---|---|
| Article number | 272 |
| Journal | New Journal of Physics |
| Volume | 9 |
| Publication status | Published - 17 Aug 2007 |
Abstract
Freezing and melting behavior of nitrobenzene in mesoporous silicon with different pore size and with different porous structure have been studied using 1H 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.
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In: New Journal of Physics, Vol. 9, 272, 17.08.2007.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Freezing and melting transitions of liquids in mesopores with ink-bottle geometry
AU - Khokhlov, Alexey
AU - Valiullin, Rustem
AU - Kärger, Jörg
AU - Steinbach, Frank
AU - Feldhoff, Armin
PY - 2007/8/17
Y1 - 2007/8/17
N2 - Freezing and melting behavior of nitrobenzene in mesoporous silicon with different pore size and with different porous structure have been studied using 1H 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.
AB - Freezing and melting behavior of nitrobenzene in mesoporous silicon with different pore size and with different porous structure have been studied using 1H 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.
UR - http://www.scopus.com/inward/record.url?scp=34548165984&partnerID=8YFLogxK
U2 - 10.1088/1367-2630/9/8/272
DO - 10.1088/1367-2630/9/8/272
M3 - Article
AN - SCOPUS:34548165984
VL - 9
JO - New Journal of Physics
JF - New Journal of Physics
SN - 1367-2630
M1 - 272
ER -