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The optical birefringence of liquid n-hexane condensed in an array ofparallel silica channels of 7nm diameter and 400 micrometer length is studiedas a function of filling of the channels via the vapor phase. By an analysiswith the generalized Bruggeman effective medium equation we demonstrate thatsuch measurements are insensitive to the detailed geometrical (positional)arrangement of the adsorbed liquid inside the channels. However, this techniqueis particularly suitable to search for any optical anisotropies and thuscollective orientational order as a function of channel filling. Nevertheless,no hints for such anisotropies are found in liquid n-hexane. The n-hexanemolecules in the silica nanochannels are totally orientationally disordered inall condensation regimes, in particular in the film growth as well as in thethe capillary condensed regime. Thus, the peculiar molecular arrangement foundupon freezing of liquid n-hexane in nanochannel-confinement, where themolecules are collectively aligned perpendicularly to the channels' long axes,does not originate in any pre-alignment effects in the nanoconfined liquid dueto capillary nematization.

Liquid n-hexane condensed in silica nanochannels: A combined optical birefringence and vapor sorption isotherm study