Abstract
The electrochemical synthesis of alpha Fe2O3 nanoparticles was performed using quaternary ammonium salts viz. TPAB, TBAB and TOAB in an organic medium by optimizing current density and molar concentration of the ligand. The role of ligands in the formation of α phase, structure and magnetic properties was investigated in details. The effect of increasing chain length on the particle size confirmed that as the chain length increases from propyl to octyl, the particle size decreases. X-ray diffraction spectra of as prepared samples and TEM analysis confirmed the amorphous nature of iron oxide. TEM showed beads of iron oxide joined together with a size distribution in the range of 6–30 nm. The Mossbauer studies also support this observation that for the lowest particle size, the line width is broader which successively reduces with increase in particle size. Iron oxide capped with TOAB indicated superparamagnetic nature at room temperature. The resultant internal magnetic field of 506 mm/s due to hyperfine splitting clearly established the formation of α-Fe2O3 The infrared spectroscopy and pH measurements revealed the binding of tetra alkyl ligand with iron oxide. The IR spectra and the increase in basicity of as prepared samples confirmed the formation of hydrated iron oxide. Above 800°C the spectra indicated only iron oxide. Surface area obtained by BET method was 205 m2/g.
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References
Anton I., (1990). J. Magn. Magn. Mater. 85:219
Bakre P.P.,Gupta M.P., Sinha A.P.B. (1980). Ind. J.Pure.&Appl. Phy.18: 473
Burkhard D., (1997). J. M. Solid. State. Comm. 101:903
Chang J.S., S.E. Park & M.S. Park, 1997. Chem. Lett. 11, 1123.
Chhobro V., Ayyub P., Chattopadhyay S. (1996). Mat Lett 26: 21
Cornell R.M., Schwertmann U. (2003). The Iron Oxides Structure Properties Reactions and Uses. Weinheim Edn2nd, VCH
decosta G.M., deGrave E., Bowen L.H.,Vanderberghe R.E. A.(1994). Clays Clay Min. 42:628
Deshpande K., A. Mukasyan & A. Varma, Chem. Mater. published on web, 2004.
Gunther L., (1990). Phys. World. 3:28
Huang C.S., Xu.L., Davis B.H. (1993). Fuel. Sci. Techn. Int.11:639
Jiag K., J. Yang, B. Hu & G. Zang, 1998. Hyperfine Interact. 111, 45.
Joshi S.S., Patil S.F., Iyer V., Mahamuni S., (1998). Nanost Mate 10(7):1135
Jung H., Thomson W. (1993). J. Catal.139:375
Kosmas C.S., Franzmeier D.P. (1986). Clays. Clay. Min. 34: 625
van der Kraan A.M. (1998). Hyperfine Interact 111:23
Liao X., Zhu J. (2001). Mat. Lett. 50: 341
Livage J., (1981). J. Phys. 42:981
Mahamuni S., Bendre B.S., Joshi S.S., Bedekar A.G., Patil S.F., (1996). Nanost. Mate.7(5):557
Matutes-Aquino J.,Garcia P.(1999). Mat.Lett. 38,3:173
Mendoza M.N., Sunil D., (1990). Apply. Phys. Lett. 57:209
Mimura N., Takahara I., Ando M., (1998). Cata. Today. 45:61
Morsi M.M., El-Shennowi A.W., (1993). A. Ceram. Inst. 19:333
Murad E., Bishop J.L.(2000). Am. Min. 85:716
MusicS., Santana G.P. (1999). Croatica Chemica Acta72(1): 87
Nixon L., Koval C.A., (1992). Chem. Mater. 4:117
Pascal C., Pascal J.L., Favier F., Payen C., Moubtassim M.E.L.(1999). Chem. Mater.11:141
Reetz M.T., HelbigW. (1994). J. Am. Chem. Soc.116:7401
Rendon J.L., Serna C.J. (1981). Clay Min. 16: 375
Rochester C.H., Topham S.A. (1979a). J. Chem. Soc. Faraday. Trans. I. 75: 1073
Sazonova V.A., Prokudina N.A., Gavrilov V.Y. (1997). Russ. J. Appl. Chem. 70:87
Shon G., Simon V., (1995). Colloid. Poly. Sci. 273:101
Stanjeck H., SchwertmannU.(1992). Clays Clay Min.40: 347
Telkar M.M., Rode C.V., Choudhary R.V., Joshi S.S., Nalawade A.M., (2004). J. Appl. Cata. A 273:11
Temgire M.K., Joshi S.S., (2004). Rad Phy Chem 71:1039
Wang S., Lin W. (1997). Mat. Lett. 33:113
Xu L., Bao S., O’Brian R. (1994). J. Fuel. Sci. Techn. Int. 12:1323
Zhao J., Huggins F.E., Feng Z.(1993). J. Catal. 143: 499
Zscherpel D.,WeissW., Schogl R.(1997). Surf. Sci. 382: 326
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M.S. Nimase and P.R. Patil thank the funding agencies UGC and ISRO respectively for the financial support.
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Joshi, S.S., Patil, P.R., Nimase, M.S. et al. Role of ligands in the formation, phase stabilization, structural and magnetic properties of α-Fe2O3 nanoparticles. J Nanopart Res 8, 635–643 (2006). https://doi.org/10.1007/s11051-005-9033-x
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DOI: https://doi.org/10.1007/s11051-005-9033-x