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  4. Preferred orientation of n-hexane crystallized in silicon nanochannels: a combined x-ray diffraction and sorption isotherm study
 
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Preferred orientation of n-hexane crystallized in silicon nanochannels: a combined x-ray diffraction and sorption isotherm study

Publikationstyp
Journal Article
Date Issued
2009-03-19
Author(s)
Henschel, Anke  
Kumar, Pushpendra  
Hofmann, Tommy  orcid-logo
Knorr, Klaus  
Huber, Patrick  orcid-logo
TORE-URI
http://hdl.handle.net/11420/12993
Journal
Physical review E - Statistical, Nonlinear, and Soft Matter Physics  
Volume
79
Issue
3
Article Number
032601
Citation
Physical Review E 79 (3): 032601 (2009-03-19)
Publisher DOI
10.1103/PhysRevE.79.032601
Scopus ID
2-s2.0-64049119531
ArXiv ID
0903.3379v1
Publisher
American Physical Society
We present an x-ray diffraction study on n-hexane in tubular silicon channels of approximately 10 nm diameter both as a function of the filling fraction f of the channels and as a function of temperature. Upon cooling, confined n-hexane crystallizes in a triclinic phase typical of the bulk crystalline state. However, the anisotropic spatial confinement leads to a preferred orientation of the confined crystallites, where the <001> crystallographic direction coincides with the long axis of the channels. The magnitude of this preferred orientation increases with the filling fraction, which corroborates the assumption of a Bridgman-type crystallization process being responsible for the peculiar crystalline texture. This growth process predicts for a channel-like confinement an alignment of the fastest crystallization direction parallel to the long channel axis. It is expected to be increasingly effective with the length of solidifying liquid parcels and thus with increasing f. In fact, the
fastest solidification front is expected to sweep over the full silicon nanochannel for f=1, in agreement with our observation of a practically perfect texture for entirely filled nanochannels.
Subjects
Chemical Physics
Mesoscopic Systems and Quantum Hall Effect
Soft Condensed Matter
DDC Class
530: Physik
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