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We have studied the effects of quenched random disorder created by dispersedaerosil nanoparticle gels on the nematic to smectic-A (N-SmA) and smectic-A toreentrant nematic (SmA- RN) phase transitions of thermotropic liquid crystalmixtures of 6OCB (hexyloxycyanobiphenyl) and 8OCB (octyloxycyanobiphenyl).These effects are probed using high-resolution synchrotron x-ray diffractiontechniques. We find that the reentrant characteristics of the system arelargely unchanged by the presence of the aerosil gel network. By comparingmeasurements of the smectic static structure amplitude for this8OCB-6OCB+aerosil system with those for butyloxybenzilidene-octylaniline(4O.8)+aerosil gels, we find that the short-range smectic order in thesmectic-A phase is significantly weaker in the reentrant system. This result isconsistent with the behavior seen in pure 8OCB-6OCB mixtures. The strength ofthe smectic ordering decreases progressively as the 6OCB concentration isincreased. Detailed line shape analysis shows that the high- andlow-temperature nematic phases (N and RN) are similar to each other.

High resolution x-ray study of nematic-smectic-A and Smectic-A-reentrant nematic transitions in liquid crystal+aerosil gels