Physics – Condensed Matter – Soft Condensed Matter
Scientific paper
2001-12-05
Physics
Condensed Matter
Soft Condensed Matter
10 pages, 4 postscript figures as separate files
Scientific paper
10.1103/PhysRevE.65.050703
The effect on the nematic to smectic-A transition in octylcyanobiphenyl (8CB) due to dispersions of hydrogen-bonded silica (aerosil) particles is characterized with high-resolution x-ray scattering. The particles form weak gels in 8CB creating a quenched disorder that replaces the transition with the growth of short range smectic correlations. The correlations include thermal critical fluctuations that dominate at high temperatures and a second contribution that quantitatively matches the static fluctuations of a random field system and becomes important at low temperatures.
Birgeneau Robert J.
Gallani J.-L.
Garland Carl W.
Iannacchione Germano S.
Leheny Robert L.
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