Showing papers by "Anand Yethiraj published in 2004"
99 citations
TL;DR: Structures with order intermediate between close-packed and body-centered tetragonal were observed, with these intermediate structures also being stable and long lived, essentially a colloidal analogue of an "atomic-level" interfacial structure.
Abstract: We study the properties of a solid-solid close-packed to body-centered tetragonal transition in a colloidal suspension via fluorescence confocal laser scanning microscopy, in three dimensions and in real space. This structural transformation is driven by a subtle competition between gravitational and electric dipolar field energy, the latter being systematically varied via an external electric field. The transition threshold depends on the local depth in the colloidal sediment. Structures with order intermediate between close-packed and body-centered tetragonal were observed, with these intermediate structures also being stable and long lived. This is essentially a colloidal analogue of an ‘‘atomiclevel’’ interfacial structure. We find qualitative agreement with theory (based purely on energetics). Quantitative differences can be attributed to the importance of entropic effects.
88 citations
TL;DR: In this article, the nuclear magnetic resonance (NMR) spectra of three substituted benzenes as solutes in the liquid crystal 8CB were investigated and the orientational order of all solutes was obtained in the nematic and smectic-A phases.
22 citations