Physics – Condensed Matter – Soft Condensed Matter
Scientific paper
2004-11-23
J. Chem. Phys. 122, 064903 (2005).
Physics
Condensed Matter
Soft Condensed Matter
9 pages, 7 figures, to appear in JCP
Scientific paper
10.1063/1.1849159
Using a version of density-functional theory which combines Onsager approximation and fundamental-measure theory for spatially nonuniform phases, we have studied the phase diagram of freely rotating hard rectangles and hard discorectangles. We find profound differences in the phase behavior of these models, which can be attributed to their different packing properties. Interestingly, bimodal orientational distribution functions are found in the nematic phase of hard rectangles, which cause a certain degree of biaxial order, albeit metastable with respect to spatially ordered phases. This feature is absent in discorectangles, which always show unimodal behavior. This result may be relevant in the light of recent experimental results which have confirmed the existence of biaxial phases. We expect that some perturbation of the particle shapes (either a certain degree of polydispersity or even bimodal dispersity in the aspect ratios) may actually destabilize spatially ordered phases thereby stabilizing the biaxial phase.
Martinez-Raton Yuri
Mederos Luis
Velasco Enrique
No associations
LandOfFree
Effect of particle geometry on phase transitions in two-dimensional liquid crystals does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Effect of particle geometry on phase transitions in two-dimensional liquid crystals, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Effect of particle geometry on phase transitions in two-dimensional liquid crystals will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-598934