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Simulated spatio-temporal evolution of microdroplet arrays Click for animation.

Spatio-temporal emergence of mesophase domains in mixtures of rigid rod and liquid crystalline polymer Thein Kyu, The University of Akron, DMR 02-09272.

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Simulated spatio-temporal evolution of microdroplet arrays Click for animation.

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  1. Spatio-temporal emergence of mesophase domains in mixtures of rigid rod and liquid crystalline polymer Thein Kyu, The University of Akron, DMR 02-09272 To fabricate holographic polymer dispersed liquid crystals (H-PDLC) and polymer photonic crystals, pattern photo-polymerization technique has been developed by inducing phase separation in mixtures of liquid crystals and photo-reactive monomer. The H-PDLC instrument is designed to be compact and portable for demonstration purposes, which permits in-situ measurement of diffraction efficiency and phase separation dynamics during photo-patterning. As a complementary study, simulation has been undertaken to elucidate the spatio-temporal growth of the nematic domains in a single component system as well as in binary liquid crystal and photo-polymerizable mixtures. Potential applications include 2D&3D diffraction gratings, tunable focal length microlens, filtrations, biosensors, etc. This part of the project has been extended to dispersing functionalized dendrimers and solid crystals within the aforementioned microdroplet arrays. AFM of microdroplet array pattern containing dendrimers Illustration of Four wave interference concept Simulated spatio-temporal evolution of microdroplet arrays Click for animation. The development of four-wave optical interference device is just completed. We are currently collaborating with the Akron Global Polymer Academy to interact with local high school(s) for demonstration of holographic optics. Holographic optical device

  2. Broader Impact: Application to Directional Solidification Spontaneous pattern formations in nature have attracted immense interest. In-depth understanding is crucial for the elucidation of morphology development under directional solidification and physics of pattern formation. Simulations based on the phase-field model captured the observed morphologies including dendrites, degenerate seaweed, and seaweed patterns that grow from the left (cold) wall to the right (hot). This part of the work has been collaborated with Prof. G.-X. Wang’s group of Department of Mechanical Engineering at UA. A similar methodology has been extended to elucidation of mechanical coupling in formation of polymer single crystals. c a b 300μm (a) Dendrite, (b) degenerate seaweed and (c) seaweed growth in succinonitrile subjected to temperature gradient in comparison with the corresponding patterns simulated in the context of the phase field model of directional solidifications. One undergraduate (Bryan Shields) and five graduate students (Rujul Mehta, Scott Meng, Haijun Xu, Pratyush Dayal, Kumar Nanjundiah) are involved in this project. Rujul is finishing his Ph.D and will join as a postdoc Prof. M. Dadmum’s group at University of Tennessee. Kumar will graduate with a M.S. degree shortly and will join Department of Polymer Science at UA in coming spring semester.

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