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The effect on the nematic to smectic-A transition in octylcyanobiphenyl (8CB)due to dispersions of hydrogen-bonded silica (aerosil) particles ischaracterized with high-resolution x-ray scattering. The particles form weakgels in 8CB creating a quenched disorder that replaces the transition with thegrowth of short range smectic correlations. The correlations include thermalcritical fluctuations that dominate at high temperatures and a secondcontribution that quantitatively matches the static fluctuations of a randomfield system and becomes important at low temperatures.Comment: 10 pages, 4 postscript figures as separate file

physical review. e, statistical physics, plasmas, fluids, and related interdisciplinary topics

Hydrogen-bonded silica gels dispersed in a smectic liquid crystal: A random field<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>XY</mml:mi></mml:math>system

Hydrogen-bonded silica gels dispersed in a smectic liquid crystal: A random fieldXYsystem