Magnetic Ni/SiO2 composite microcapsules prepared by one-pot synthesis

• Published in: Journal of materials chemistry Vol. 19; no. 9; pp. 1245 - 1251
• Main Authors: Tu, Chifeng, Du, Jingjie, Yao, Li, Yang, Chunhui, Ge, Maofa, Xu, Chuanlai, Gao, Mingyuan
• Format: Journal Article
• Language: English
• Published: Cambridge Royal Society of Chemistry 01.01.2009
• Subjects: Applied sciences; Catalysis; Catalysts: preparations and properties; Chemistry; Exact sciences and technology; Forms of application and semi-finished materials; General and physical chemistry; Miscellaneous; Polymer industry, paints, wood; Technology of polymers; Theory of reactions, general kinetics; Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry; External field; Crystalline phase; Organic silane; X ray diffraction; Composite material; Magnetic field effect; Transmission electron microscopy; Photoionization; Silicon oxides; Morphology; Reaction mechanism; Ultraviolet photoelectron spectra; Nickel; Microstructure; Formation mechanism
• ISSN: 0959-9428; 1364-5501
• DOI: 10.1039/b816568h

The Ni/SiO2 composite microcapsules were prepared by a one-pot synthesis via thermally decomposing Ni(acac)2*2H2O in 2-pyrrolidone in the presence of tetraethyloxysilane and 3-aminopropyltrimethoxysilane (APS). Transmission electron microscopy and powder X-ray diffraction were used to characterize the general morphology of the resultant capsules as well as the crystalline phases of the Ni nanocrystals incorporated. Ultraviolet photoelectron spectroscopy and ultraviolet photoionization mass spectroscopy were adopted to analyze the gaseous species released during the reaction to elucidate the mechanism behind the formation of the Ni/SiO2 composite microcapsules. Preliminary experiments were designed to show the catalytic ability of the resultant capsules which were collectable by applying an external magnetic field.