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: https://doi.org/10.1088/1367-2630/9/8/272
Abstract: | |
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 |
pos. | country | downloads | ||
---|---|---|---|---|
total | perc. | |||
1 | Germany | 265 | 76.81% | |
2 | United States | 41 | 11.88% | |
3 | China | 17 | 4.93% | |
4 | United Kingdom | 3 | 0.87% | |
5 | Poland | 2 | 0.58% | |
6 | Hong Kong | 1 | 0.29% | |
7 | France | 1 | 0.29% | |
8 | Finland | 1 | 0.29% | |
9 | Ecuador | 1 | 0.29% | |
10 | Colombia | 1 | 0.29% | |
other countries | 12 | 3.48% |
Hinweis
Zur Erhebung der Downloadstatistiken kommen entsprechend dem „COUNTER Code of Practice for e-Resources“ international anerkannte Regeln und Normen zur Anwendung. COUNTER ist eine internationale Non-Profit-Organisation, in der Bibliotheksverbände, Datenbankanbieter und Verlage gemeinsam an Standards zur Erhebung, Speicherung und Verarbeitung von Nutzungsdaten elektronischer Ressourcen arbeiten, welche so Objektivität und Vergleichbarkeit gewährleisten sollen. Es werden hierbei ausschließlich Zugriffe auf die entsprechenden Volltexte ausgewertet, keine Aufrufe der Website an sich.