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Preparation of P2O5-SiO_(2) hollow microspheres in the presence of phosphoric acid

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摘要 Silica hollow microspheres containing phos-phorous have been prepared by a sol-gel/emulsion method which uses tetraethoxysilane(TEOS)as the precursor for the SiO_(2) and phosphoric acid(H3PO4)as the precursor for P2O5.The hollow structure forms an emulsion system which is composed of an oil phase(kerosene,sorbitan monooleate(Span 80))and an aqueous phase(a viscous sol solution of ethanol,TEOS and H3PO4).Some of the phosphorous remains in thefinal silica shell structure even after calcination at 650°C.The hollow structure of the P2O5-SiO_(2)(silicophosphate)was characterized by X-ray diffraction(XRD),polarized optical microscopy(POM),scanning electron microscopy(SEM),nitrogen adsorption measurement and Fourier transform infrared spectroscopy(FTIR).
出处 《Frontiers of Chemical Science and Engineering》 SCIE EI CSCD 2011年第3期314-317,共4页 化学科学与工程前沿(英文版)
基金 supported by the Graduate Creativity Fund from the China University of Petroleum,Special Plan of Science and Technology of Dongying(T1104002) the Open project from the State Key Laboratory of Fiber Modification(SKLFM)at Donghua University(LK0905 and LK0910).
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