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X-ray scattering study of smectic ordering in a silica aerogel

Physical Review Letters, ISSN: 0031-9007, Vol: 71, Issue: 21, Page: 3505-3508
1993
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We have studied, via x-ray scattering, the nematic to smectic-A (NA) translational ordering of the liquid-crystal forming compound octylcyanobiphenyl (8CB) incorporated into the pores of a silica aerogel. We find that the aerogel dramatically alters 8CB phase behavior, eliminating the NA transition found at T=TNA=33.7°C in bulk samples and replacing it by a short range smectic ordering having a correlation length which at TNA is 40, much smaller than the aerogel pore and nematic domain size p200. As T is lowered this smectic disorder is eliminated from the pores, increasing continuously over a 20°C range to saturate at p for T

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