  High-resolution X-ray scattering studies of the nonpolar thermotropic liquid
crystal 4-n-pentylphenylthiol-4'-n-octyloxybenzoate (\bar{8}S5) in aerosil gel
nano-networks reveal that the aerosil-induced disorder significantly alters
both the nematic to Smectic-A and Smectic-A to Smectic-C phase transitions. The
limiting Smectic-A correlation length follows a power-law dependence on the
aerosil density in quantitative agreement with the limiting lengths measured
previously in other Smectic-A liquid crystal gels. The Smectic-A to Smectic-C
liquid crystalline phase transition is altered fundamentally by the presence of
the aerosil gel. The onset of the Smectic-C phase remains relatively sharp but
there is an extended coexistence region where Smectic-A and Smectic-C domains
can exist.

Soft Condensed Matter