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14 results on '"Wang, Bainian"'

6. A new route to synthesize calcium carbonate microspheres from phosphogypsum

Author

Wan Qiang, Fang Xiaoyu, Yang Baojun, Wang Bainian, and Yang Mengmeng

Subjects
Calcite, Materials science, Polymers and Plastics, Dispersity, Metals and Alloys, Nucleation, Surfaces, Coatings and Films, Electronic, Optical and Magnetic Materials, Biomaterials, chemistry.chemical_compound, Calcium carbonate, chemistry, Dynamic light scattering, Chemical engineering, Vaterite, Particle size, Sodium gluconate
Abstract

In this work, monodisperse spherical vaterite calcium carbonate (CaCO3) was synthesized at room temperature and atmospheric pressure through a simple and efficient 'phase transfer-precipitation' route using phosphogypsum (PG) as raw material, sodium gluconate(SG) as phase transfer agent and CO2 as precipitator. CaCO3 samples were characterized by Field-emission scanning electron microscopy (FE-SEM), x-ray diffraction (XRD), and Dynamic light scattering (DLS). The composition of the as-obtained sample was almost monodisperse spherical vaterite CaCO3 by adjusting the concentration of SG and other operational conditions. The effects of SG and STP on the formation of CaCO3 microspheres were investigated. The results indicated that the existence of SG inhibited the nucleation and growth of calcite but promoted the formation of vaterite. The effects between SG and Ca2+ played a key role in the formation process of monodisperse spherical vaterite CaCO3. The existence of STP can effectively control the further growth and enhance the uniformity of the particle size of CaCO3 microspheres. These studies are promising for the industrial preparation and further commercial applications of monodisperse spherical vaterite CaCO3.

Published
2019

12. The fabrication of polymer dispersed liquid crystal based on SiO 2 photonic crystal template.

Author

Wang, Jianhua, Shi, Shuhui, and Wang, Bainian

Subjects
POLYMER liquid crystals, PHOTONIC crystals, MICROFABRICATION, DISPERSION (Chemistry), NANOPARTICLE synthesis, CONDUCTING polymer films, CHEMICAL templates
Abstract

The conductance of polymer matrix is an important factor for the property of the polymer dispersed liquid crystal (PDLC). The nanographites are dispersed into the polymer matrix for optimising the dielectric conductive property. The synthesised nanoparticles SiO2was used as photonic crystal (PC) to work as a template for fabricating PDLC films. A mixture of pre-polymer and liquid crystals (LCs) was infiltrated into the void of the PC and polymerised under ultraviolet light. The void of the PC made uniform the dispersion of the liquid crystals in the films. The optical property of the PDLC films was optimised by doped nanographites and negative charge SiO2template. The effect of negative charge SiO2and nanographites on the threshold voltage and driving voltage was researched. The morphology of the PDLC films was studied by the FTIR image. The dispersed LCs droplets were uniformly affected by the addition of the nanographites. The LCs droplets dispersed in the polymer were located in the void of the SiO2photonic crystal. [ABSTRACT FROM PUBLISHER]

Published
2015
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