Fe(OH)3 precursor sol was prepared by a sol-gel method.The precursor sol was dipped onto the absorbent cotton,and gel was formed on the absorbent cotton template after the volatilization of moisture.Fe2O3 microtubules were synthesized after the process of self-propagation or calcination.The phase,morphology,and particle diameter of the samples were examined by X-ray diffraction(XRD)and scanning electron microscopy(SEM),and the magnetic properties of the samples were measured using a vibrating sample magnetometer(VSM).The external diameters of Fe2O3 microtubules ranged between 8 and 13 μm,and the wall thicknesses ranged between 0.5 and 2 μm The type of the calcination method plays a significant role in developing the Fe2O3 phase and the variation in the magnetic properties in the sol-gel template complexing method.γ-Fe2O3 was synthesized by a self-propagation method.However,α-Fe2O3 was synthesized after calcination at 400℃ for 2 h.The coercivity of the samples synthesized by calcination at 400℃ for 2 h after self-propagation was found to increase significantly,thereby presenting hard magnetic properties.
参考文献
| [1] | Cornell R.M;Schwertmann U.The Iron Oxides[M].Wiley-VCH:Weinheim,1996:463. |
| [2] | Sun HT.;Faccio M.;Pelino M.;Catalano M.;Tapfer L.;Cantalini C. .POROUS SILICA-COATED ALPHA-FE2O3 CERAMICS FOR HUMIDITY MEASUREMENT AT ELEVATED TEMPERATURE[J].Journal of the American Ceramic Society,1996(4):927-937. |
| [3] | Liu XQ.;Shen YS.;Tao SW. .PREPARATION AND CHARACTERIZATION OF NANOCRYSTALLINE ALPHA-FE2O3 BY A SOL-GEL PROCESS[J].Sensors and Actuators, B. Chemical,1997(2/3):161-165. |
| [4] | Itoh H.;Sugimoto T. .Systematic control of size, shape, structure, and magnetic properties of uniform magnetite and maghemite particles[J].Journal of Colloid and Interface Science,2003(2):283-295. |
| [5] | Rockenberger J;Scber E.C;Alivisatos A.P .A new nonhydrolytic single-precursor approach to surfactant-capped nanocrystals of transition metal oxides[J].Journal of the American Chemical Society,1999,121(49):11595. |
| [6] | Idriss H.;Seebauer EG. .Reactions of ethanol over metal oxides[J].Journal of molecular catalysis, A. Chemical,2000(1/2):201-212. |
| [7] | Denizot B;Tanguy G;Hindre F;Rump E.,Jeune J.,and Jallet P .Phosphorylcholine coating of iron oxide nanoparticles[J].Journal of Colloid and Interface Science,1999,209(01):66. |
| [8] | Jing Z.H;Wang Y;Wu S.H .Hydrothermal synthesis,characterization and magnetic studies on various morphological hematite nanopowders[J].Chinese Journal of Inorganic Chemistry,2008,62:988. |
| [9] | 张剑光,张明福,韩杰才,赫晓东.新型燃烧合成方法制备α-Fe2O3纳米晶[J].材料工程,2001(07):40-42. |
| [10] | Wei Y;Liu X.L;Zheng X.Z .Preparation of ultrafine monodispersed α-Fe2O3 hydrosol[J].Acta Physico-Chimica Sinica,1996,12(06):551. |
| [11] | 张秀丽,刘辉,魏雨,马子川.纺锤形α-Fe2O3粒子的溶液催化合成[J].化学学报,2005(12):1141-1146. |
| [12] | Han X.B;Huang L;Hui Z .Microwave-hydrolysis synthesis spindle-type α-Fe2O3 particles[J].Journal of Inorganic Materials,1999,14(04):669. |
| [13] | Hyun Gil Cha;Chang Woo Kim;Young Hwan Kim;Mi Hyang Jung;Eun Sun Ji;Bijoy K. Das;Ju Chang Kim;Young Soo Kang .Preparation and characterization of α-Fe_2O_3 nanorod-thin film by metal-organic chemical vapor deposition[J].Thin Solid Films: An International Journal on the Science and Technology of Thin and Thick Films,2009(5):1853-1856. |
| [14] | Dongmok Whang;Song Jin;Yue Wu;Charles M. Lieber .Large-Scale Hierarchical Organization of Nanowire Arrays for Integrated Nanosystems[J].Nano letters,2003(9):1255-1259. |
| [15] | Zhan SH;Chen DR;Jiao XL;Liu SS .Facile fabrication of long alpha-Fe2O3, alpha-Fe and gamma-Fe2O3 hollow fibers using sol-gel combined co-elecrospinning technology[J].Journal of Colloid and Interface Science,2007(1):265-270. |
| [16] | 李巧玲,王永飞,叶云,张存瑞.针状纳米SrFe12O19的溶胶-凝胶法制备及磁性研究[J].无机化学学报,2008(06):907-912. |
| [17] | 李巧玲,魏雨,李琳.纺锤形α-Fe2O3成核前水解机理的研究[J].无机材料学报,2000(06):1093-1096. |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%