By a News Reporter-Staff News Editor at Journal of Technology -- Data detailed on Powder Technology have been presented. According to news reporting out of Beijing, People's Republic of China, by VerticalNews editors, research stated, "The Fe3O4 magnetic microspheres were prepared by a cetyltrimethyl ammonium bromide (CTAB) modified solvothermal process. Then CTAB-modified Fe3O4 microspheres were directly coated by mesoporous SiO2 and gamma-AlOOH shell, respectively, and the SiO2@Fe3O4 and gamma-AlOOH@Fe3O4 magnetic core-shell composites were obtained."
Our news journalists obtained a quote from the research from the Beijing University of Chemical Technology, "The samples were characterized by FT-IR, XRD, Raman spectroscopy, SEM, TEM, N-2 adsorption-desorption technology, and vibrating sample magnetometer (VSM). The results indicate that CTAB molecules play the roles of capping agent, dispersant, and crystal growth oriented agent during the high-temperature solvothermal process. Thus as-prepared Fe3O4 microspheres are assembled by small primary nanocrystals with uniform crystal orientation, and exhibit narrow size distribution, monodispersity, and superparamagnetism with high saturation magnetization (Ms). The formation of Fe3O4 microspheres combines oriented attachment and Ostwald ripening mechanisms. Furthermore, the adsorbed CAB molecules can serve as nucleation seeds for precipitation of SiO2 and gamma-AlOOH, and as templates for growth of mesoporous SiO2. In SiO2@Fe3O4 the mesoporous SiO2 shell presents short-range ordered pores with mean pore size of 2.1 nm. The shell of gamma-AlOOH@Fe3O4 is composed of many irregular gamma-AlOOH nanosheets with thickness of 3.0-5.0 nm."
According to the news editors, the research concluded: "The BET surface areas of SiO2@Fe3O4 and gamma-AlOOH@Fe3O4 reach up to 441 m(2)/g and 289 m(2)/g, respectively."
For more information on this research see: Modified solvothermal synthesis of magnetic microspheres with multifunctional surfactant cetyltrimethyl ammonium bromide and directly coated mesoporous shell. Powder Technology, 2013;246():520-529. Powder Technology can be contacted at: Elsevier Science Bv, PO Box 211, 1000 Ae Amsterdam, Netherlands. (Elsevier - www.elsevier.com; Powder Technology - www.elsevier.com/wps/product/cws_home/504094)
Our news journalists report that additional information may be obtained by contacting H.F. Liu, Beijing University of Chemical Technology, State Key Lab Chem Resource Engn, Beijing 100029, People's Republic of China. Additional authors for this research include S.F. Ji, Y.Y. Zheng, M. Li and H. Yang.
Keywords for this news article include: Asia, Beijing, Powder Technology, People's Republic of China
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