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Full-Text Articles in Engineering
Dynamics And Morphology Development In Electrospun Fibers Driven By Concentration Sweeps, Pratyush Dayal, Thein Kyu
Dynamics And Morphology Development In Electrospun Fibers Driven By Concentration Sweeps, Pratyush Dayal, Thein Kyu
Thein Kyu
The present article describes the modeling and simulation of the dynamics of the electrospinning process coupled with the spatio-temporal evolution of fiber morphology driven by concentration sweeps. The electrospinning process has been modeled based on an array of beads connected by Maxwell's elements in a cylindrical shell to describe the force balance between Coulombic and viscoelastic forces at the surface of the jet. The phase separation dynamics has been calculated in the framework of the Cahn-Hilliard time-evolution equation by incorporating Flory-Huggins free energy for liquid-liquid demixing in conjunction with solvent evaporation through the fiber surface. The simulations based on the …
Phase Dissolution In A Liquid-Crystalline Polymer-Solution, T Kyu, Z. Ping, P. Mukherjee
Phase Dissolution In A Liquid-Crystalline Polymer-Solution, T Kyu, Z. Ping, P. Mukherjee
Thein Kyu
No abstract provided.
Phase-Separation Dynamics Of A Polymer-Dispersed Liquid-Crystal, Thein Kyu, I Ilies, M Mustafa
Phase-Separation Dynamics Of A Polymer-Dispersed Liquid-Crystal, Thein Kyu, I Ilies, M Mustafa
Thein Kyu
Phase separation in a polymer dispersed liquid crystal (PDLC), consisting of a main chain liquid crystal (E7) and polymethyl methacrylate (PMMA), was studied by means of light scattering and optical microscopy. The PMMA/E7 mixture exhibits an upper critical solution temperature (UCST), overlapping with a nematic-isotropic transition of the E7 liquid crystal. Several temperature quenches were undertaken by rapidly transferring the 60/40 PMMA/E7 from a single phase (95-degrees-C) to an unstable region (25, 35 and 45-degrees-C) and by subsequently monitoring the time-evolution of scattering profiles. The time-evolution of structure factor reveals a cross-over of a kinetic exponent from -0.33 to -0.6 …