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The optical birefringence of rod-like nematogens (7CB, 8CB), imbibed inparallel silica channels with 10 nm diameter and 300 micrometer length, ismeasured and compared to the thermotropic bulk behavior. The orientationalorder of the confined liquid crystals, quantified by the uniaxial nematicordering parameter, evolves continuously between paranematic and nematicstates, in contrast to the discontinuous isotropic-to-nematic bulk phasetransitions. A Landau-de Gennes model reveals that the strength of theorientational ordering fields, imposed by the silica walls, is beyond acritical threshold, that separates discontinuous from continuousparanematic-to-nematic behavior. Quenched disorder effects, attributable towall irregularities, leave the transition temperatures affected onlymarginally, despite the strong ordering fields in the channels.

Continuous Paranematic-to-Nematic Ordering Transitions of Liquid Crystals in Tubular Silica Nanochannels