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We present a neutron scattering analysis of the structure of the smecticliquid crystal octylcyanobiphenyl (8CB) confined in one-dimensional nanoporesof porous silicon films (PS). The smectic transition is completely suppressed,leading to the extension of a short-range ordered smectic phase aligned alongthe pore axis. It evolves reversibly over an extended temperature range, downto 50 K below the \textit{N-SmA} transition in pure 8CB. This behavior stronglydiffers from previous observations of smectics in different one-dimensionalporous materials. A coherent picture of this striking behavior requires thatquenched disorder effects are invoked. The strongly disordered nature of theinner surface of PS acts as random fields coupling to the smectic order. Theone-dimensionality of PS nano-channels offers new perspectives on quencheddisorder effects, which observation has been restricted to homogeneous randomporous materials so far.Comment: Submitted to Phys. Rev.

Evidence of anisotropic quenched disorder effects on a smectic liquid crystal confined in porous silicon