Carl W. Garland

Learn More
High-resolution calorimetric studies have been made of the liquid crystal phase transitions for several dispersions of 70-Å-diam silica spheres ~aerosil! in octylcyanobiphenyl ~8CB! as a function of silica density rS . The excess specific heat peaks associated with the nematic-isotropic (N-I) and the nematic–smectic-A (N-SmA) transitions both exhibit shifts(More)
A high-resolution calorimetric study has been made on the smectic-A to nematic phase transition in liquid crystals perturbed by the dispersion of 70-Å-diam silica spheres ~aerosils!. The specific heat peak of this transition decreases in amplitude and shifts to lower temperatures with increasing silica density. However, it remains sharp in comparison to the(More)
Liquid crystals offer many unique opportunities to study various phase transitions with continuous symmetry in the presence of quenched random disorder (QRD). The QRD arises from the presence of porous solids in the form of a random gel network. Experimental and theoretical work supports the view that for fixed (static) inclusions, quasi-long-range smectic(More)
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(More)
High-resolution x-ray diffraction and ac-calorimetric experiments have been carried out on the liquid-crystal octyloxycyanobiphenyl in which aerosil particles are dispersed. The measurements were made over a temperature range around the bulk nematic to smectic-A transition temperature. At this transition the liquid crystal breaks translational symmetry in a(More)
A high resolution a.c. calorimetric study of a phenyl pyrimidine derivative with one alkyl and one per ̄ uorinated end group shows that the excess heat capacity associated with the smectic A± smectic C transition exhibits critical ̄ uctuation behaviour that is consistent with the three-dimensional XY universality class. This is in contrast to the usual(More)