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000022230 084__ $$2WoS$$aPhysics, Atomic, Molecular & Chemical
000022230 1001_ $$0P:(DE-HGF)0$$aHofmann, T.$$b0
000022230 245__ $$aMolecular dynamics of n-hexane: A quasi-elastic neutron scattering study on the bulk and spatially nanochannel-confined liquid
000022230 260__ $$aAmsterdam [u.a.]$$bElsevier Science$$c2012
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000022230 440_0 $$09841$$aChemical Physics$$v136$$x0301-0104
000022230 500__ $$aThis work was supported by the German Research Foundation (DFG) within the priority program 1144, Micro- and Nanofluidics, Grant No. Hu 850/2.
000022230 520__ $$aWe present incoherent quasi-elastic neutron scattering measurements in a wave vector transfer range from 0.4 Å(-1) to 1.6Å (-1) on liquid n-hexane confined in cylindrical, parallel-aligned nanochannels of 6 nm mean diameter and 260 μm length in monolithic, mesoporous silicon. They are complemented with, and compared to, measurements on the bulk system in a temperature range from 50 K to 250 K. The time-of-flight spectra of the bulk liquid (BL) can be modeled by microscopic translational as well as fast localized rotational, thermally excited, stochastic motions of the molecules. In the nano-confined state of the liquid, which was prepared by vapor condensation, we find two molecular populations with distinct dynamics, a fraction which is immobile on the time scale of 1 ps to 100 ps probed in our experiments and a second component with a self-diffusion dynamics slightly slower than observed for the bulk liquid. No hints of an anisotropy of the translational diffusion with regard to the orientation of the channels' long axes have been found. The immobile fraction amounts to about 5% at 250 K, gradually increases upon cooling and exhibits an abrupt increase at 160 K (20 K below bulk crystallization), which indicates pore freezing.
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000022230 7001_ $$0P:(DE-HGF)0$$aFrick, B.$$b4
000022230 7001_ $$0P:(DE-HGF)0$$aHuber, P.$$b5
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