tailieunhanh - Báo cáo hóa học: "Preparation and Characteraction of New Magnetic Co–Al HTLc/Fe3O4 Solid Base"

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Preparation and Characteraction of New Magnetic Co–Al HTLc/Fe3O4 Solid Base | Nanoscale Res Lett 2008 3 338-342 DOI s11671-008-9162-0 NANO PERSPECTIVES Preparation and Characteraction of New Magnetic Co-Al HTLc Fe3O4 Solid Base Jun Wang Jia You Zhanshuang Li Piaoping Yang Xiaoyan Jing Milin Zhang Received 9 May 2008 Accepted 18 August 2008 Published online 5 September 2008 to the authors 2008 Abstract Novel magnetic hydrotalcite-like compounds HTLcs were synthesized through introducing magnetic substrates Fe3O4 into the Co-Al HTLcs materials by hydrothermal method. The magnetic Co-Al HTLcs with different Fe3O4 contents were characterized in detail by XRD FT-IR Sem TEM DSC and VSM techniques. It has been found that the magnetic substrates were incorporated with HTLcs successfully although the addition of Fe3O4 might hinder the growth rate of the crystal nucleus. The morphology of the samples showed the relatively uniform hexagonal platelet-like sheets. The grain boundaries were well defined with narrow size distribution. Moreover the Co-Al HTLcs doped with magnetic substrates presented the paramagnetic property. Keywords Magnetic Co-Al hydrotalcite Hydrothermal method Paramagnetism Nanoparticles X-ray techniques Introduction Hydrotalcite-like compounds HTLcs are a family of twodimensional nanostructured lamellar ionic compounds J. Wang El Z. Li P. Yang X. Jing M. Zhang College of Material Science and Chemical Engineering Harbin Engineering University Harbin 150001 P. R. China e-mail zhqw1888@ J. Wang Z. Li P. Yang X. Jing M. Zhang The Key Laboratory of Superlight Materials and Surface Technology Ministry of Education Harbin 150001 P. R. China J. You The 49th Research Institute of China Electronics Technology Group Harbin 150001 P. R. China which contains positively charged layers and exchangeable anion in the interlayer 1-3 . Recently HTLcs have received considerable attention in view of their potential usefulness as catalysts and catalyst precursors as well as for applications in areas as diverse as medicine science ion .