BITS Faculty Publications

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Subject: search.filters.subject.Crystallinity

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    Formulation and characterization of taste masked ondansetron–magnesium aluminum silicate adsorption systems
    (Taylor & Francis, 2016-01) Jadhav, Hemant R.
    Taste masking greatly influences the acceptability of bitter tasting formulation; moreover, it governs the commercial and therapeutic success of drug products.
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    Micro Structure and Characterization of Hydroxyapatite Coating (HAP) by Rod Flame Spray Process
    (ASM International, 2017-06) Srivastava, Sharad
    Hydroxyapatite (HAP) is available in powder form for plasma spraying. HAP powder was fabricated indigenously in the Rod form of diameter 4.17mm. This rod was sprayed with the help of MEC make Rodojet 9810 (flame spray process). Rodojet parameter were optimised for HAP rod. Crystallinity and purity level of HAP rod was measured. XRD and SEM were used to analysed the microstructure of rod and coating. The microstructure, mechanical properties of the coating were investigated, and measure the Ca/P ratio of coating and rod. The micro-hardness and elastic modules were determined by indentation tests and bond strength was determined by tensile test. The results showed that the microstructure, mechanical properties was observed same as in plasma spray process. Porosity was observed more than 15%. The bond strength of coating was observed 20 MPa. Scratch test was done to measure the cohesive strength of coating. This new experiments play an important role for reduction the cost of the HAP powder coating.
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    Modeling Polymer Crystallization Kinetics in the Meltblowing Process
    (ACS, 2020-12-06) Ghosal, Arkaprovo
    A novel model of the crystallization process in meltblowing process is proposed and implemented in numerical simulations. The spinline crystallization is studied using numerical solutions of the system of coupled quasi-one-dimensional equations describing the dynamics of multiple polymer jets moving in the surrounding high-speed air. Cooling, crystallization, and solidification accompany three-dimensional motion of polymer jets resulting in their vigorous stretching by the air flux including the aerodynamically driven bending/flapping. The numerical solutions predict distribution of the degree of crystallinity in polymer jets in flight, as well as in the laydown formed on the collecting screen, with the three-dimensional structure of the laydown being fully reconstructed. The effect of the collector screen temperature, die-to-collector distance (DCD), and the activation energy of the viscous flow in the polymer melt on the laydown features is studied in detail.