Preparation of PS@SiO2, PS@TiO2，PS@TiO2/SiO2 Core-Shell Composites by a Spray Drying Process and Their Hollow Spheres after Removing PS Cores by Calcinations

Ling Li; Hong Liang Li; Ying Chun Zhu; Ai Ping Fu; Yong Wan; Xiu Song Zhao

doi:10.4028/www.scientific.net/AMR.194-196.389

Paper Titles

Effect of Pulsed Electric Field on the Distribution and Migration of P, S, and Si Elements of Fe-Based Alloys
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The Effect of Hot-Rolled Coiling Time on the Texture of a New Cold-Rolled Non-Oriented Electric Steel
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Physicochemical, Gel Structure and Morphology Properties of Nano Rice Starch Prepared by Ultrasound
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Facile Preparation of Nanoporous SnO₂ for Application in Photodegradation of Methylene Blue
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Preparation of PS@SiO₂, PS@TiO₂，PS@TiO₂/SiO₂ Core-Shell Composites by a Spray Drying Process and Their Hollow Spheres after Removing PS Cores by Calcinations
p.389

Combined Manufacturing Process of Electrochemical-Etching and Electroplating on Nanoporous Silicon for its Metallization
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Synthesis of Gold Nano- and Microplates by Tryptophan and 5-Hydroxy-Tryptophan
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Influence of Temperature for Synthesis of Carbon Nanofibers from the V-Type Pyrolysis Flame
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Characterization of Protein Powder from Waste Rabbit Hair
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HomeAdvanced Materials ResearchAdvanced Materials Research Vols. 194-196Preparation of PS@SiO2, PS@TiO2，PS@TiO2/SiO2...

Preparation of PS@SiO₂, PS@TiO₂，PS@TiO₂/SiO₂ Core-Shell Composites by a Spray Drying Process and Their Hollow Spheres after Removing PS Cores by Calcinations

Abstract:

Polystyrene (PS) spheres encapsulated core-shell composites of SiO₂ or TiO₂ nanoparticles were prepared by the spray drying technique and hollow spheres of SiO₂ or TiO₂ nanoparticles were then derived by removing the PS cores with calcinations. The PS spheres were dispersed into the SiO₂ or TiO₂ colloids, forming a suspension and then the suspensions were sprayed to form micrometer-sized droplets, as the droplets rush through the drying chamber, the PS spheres were encapsulated into the core of SiO₂ or TiO₂ particles due to the high temperatures and the instant evaporation, obtaining PS@SiO₂, PS@TiO₂ or PS@SiO₂/TiO₂ core-shell composites. After removing the PS core by calcination at 550°C, SiO₂ or TiO₂ hollow spheres were then derived. The influence of drying temperature, the concentration of the SiO₂ or TiO₂ particles and the ratio of PS sphere to the particles on the structures and specific surface area of the hollow spheres were studied with scanning electron microscopy (SEM) and nitrogen adsorption-desorption measurements.