Controlled Fabrication of Nanocomposite with Ni Deposition on the Template of SiO2 Particles and its Magnetic Property
SiO2 /Ni nanocomposite is directly prepared from the silica particle by a controllable method through electroless metallization, which is different from the sol-gel technique. Its fabrication procedure is as follows: first the formation of ligating monolayer by a silane agent coupling with silica, then, binding Pd catalyst with its ligating group, finally, nano-sized Ni deposition occurs on the template. The metallic Ni particles are uniformly deposited on the silica, and they have a net or chain-like structure, just as the silica particles do. The composite inherent coercivity (iHc), saturated magnetization (MS), and residual magnetization (Mr) are 16.5, 10.0 and 1.00 respectively in the as-plated Ni. The chain-like structure causes stronger static magnetization interactions between Ni particles, resulting in a magnetic crystalline anisotropy and the higher iHc value.
Yansheng Yin and Xin Wang
Y. B. Fu and X. R. Zai, "Controlled Fabrication of Nanocomposite with Ni Deposition on the Template of SiO2 Particles and its Magnetic Property", Advanced Materials Research, Vols. 79-82, pp. 501-504, 2009