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

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dc.creatorHenschel, Anke
dc.creatorKumar, Pushpendra
dc.creatorHofmann, Tommy
dc.creatorKnorr, Klaus
dc.creatorHuber, Patrick
dc.date2009-03-19
dc.date.accessioned2026-07-07T12:58:05Z
dc.date.available2026-07-07T12:58:05Z
dc.descriptionWe 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.
dc.identifierhttps://arxiv.org/abs/0903.3379
dc.identifierhttp://arxiv.org/abs/0903.3379
dc.identifierPhysical Review E 79, 032601 (2009)
dc.identifierdoi:10.1103/PhysRevE.79.032601
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/225127
dc.subjectChemical Physics
dc.subjectMesoscale and Nanoscale Physics
dc.subjectSoft Condensed Matter
dc.titlePreferred orientation of n-hexane crystallized in silicon nanochannels: A combined x-ray diffraction and sorption isotherm study
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