title: A versatile method for controlled synthesis of porous hollow spheres.
abstract: A versatile method was developed to synthesize nickel silicate, silica, and silica-nickel composite porous hollow spheres by using silica spheres as templates. In the preparation, silica spheres were treated with a mixture of NiSO(4)·6H(2)O and NH(3)·H(2)O. The nickel-based ingredient reacted with the silica to form a shell while the alkaline solution could remove the silica core, thus forming the nickel silicate hollow spheres. After these spheres were further treated with hydrogen in reduction or with HCl in etching, they became silica-nickel hollow spheres or silica hollow spheres, respectively. The sizes of these hollow spheres depended on the concentration of the precursor. Our investigation also found that their surface properties or magnetic properties could be tailored by adjusting the fabrication parameters.
authors: Key Laboratory of Materials Physics, Institute of Solid State Physics, Chinese Academy of Sciences, P.O. Box 1129, Hefei 230031, PR China.
authors: Yongqiang
authors: Y
authors: Wang
authors: Chunjuan
authors: C
authors: Tang
authors: Quan
authors: Q
authors: Deng
authors: Changhao
authors: C
authors: Liang
authors: Dickon H L
authors: DH
authors: Ng
authors: Fung-luen
authors: FL
authors: Kwong
authors: Hongqiang
authors: H
authors: Wang
authors: Weiping
authors: W
authors: Cai
authors: Lide
authors: L
authors: Zhang
authors: Guozhong
authors: G
authors: Wang
mesh_terms: D008280:Magnetics; D008855:Microscopy, Electron, Scanning; D046529:Microscopy, Electron, Transmission; D009532:Nickel / Q000737:chemistry*; D016062:Porosity; D017640:Silicates / Q000138:chemical synthesis* / Q000737:chemistry*; D012822:Silicon Dioxide / Q000138:chemical synthesis* / Q000737:chemistry*; D013499:Surface Properties
chemical_list: D017640:Silicates; D012822:Silicon Dioxide; D009532:Nickel