The Preparation of Optically Transparent Ultra-thin Film of Stearic Acid-stabilized Superparmagnetic γ-Fe<sub>2</sub>O<sub>3</sub> Nanoparticle

Lee DK; Moon SD; Kang YS; Lee CS

Korea Polymer Journal, Vol.6, No.5, 367-373, December, 1998

The Preparation of Optically Transparent Ultra-thin Film of Stearic Acid-stabilized Superparmagnetic γ-Fe₂O₃ Nanoparticle

Lee DK, Moon SD, Kang YS, Lee CS

The γ-Fe₂O₃ nanoparticles of 81±12Å diameter were synthesized in aqueous solution and surface was coated with stearic acid. The very narrow size distribution of the stearic acid-stabilized γ-Fe₂O₃ nanoparticle was observed with TEM analysis. The electrostatic interaction between γ-Fe₂O₃ nanoparticle surface and carboxylate of the stearic acid was identified by an FT-IR spectrometer. Mossbauer and Vibrating Sample Magnetometer(VSM) spectra show that the surface coated γ-Fe₂O₃ nanoparticles and LB films have superparamagnetic properties. The formation of Langmuir monolayer of the surface coated γ-Fe₂O₃ nanoparticle at the air/water interface and its stability were studied with a pressure-area isotherm curve. Magnetic property of Langmuir-Blodgett (LB) film of the surface coated γ-Fe₂O₃ nanoparticles was studied with VSM. The surface morphology of the LB film and the homeogenous dispersion of the surface cated γ-Fe₂O₃ nanorparticles were investigated with SEM image.

[References]

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[1] Ao B, Kummerl L, Haarer D, Adv. Mater., 7, 496 (1995)

[2] Mallinson JC, The Foundation of Magnetic Recording, Academic, Berkeley, Chapter 3 (1997)

[3] Cummins CC, Schrock RR, Cohen RE, Chem. Mater., 4, 27 (1992)

[4] Yue J, Sankaran V, Chen RE, Schrock RR, J. Am. Chem. Soc., 115, 4409 (1993)

[5] Ng Cheong Y, Schrock RR, Cohen RE, J. Am. Chem. Soc., 114, 7295 (1992)

[6] Wooding A, Kilner M, Lambrick DB, J. Colloid Interface Sci., 149, 98 (1992)

[7] Wooding A, Kilner M, Lambrick DB, J. Colloid Interface Sci., 144, 236 (1992)

[8] Zhao J, Huggins FE, Huffman GP, Phys. Rev., B, Condens. Matter, 54, 3403 (1996)

[9] Freeman AJ, Ellis DE, Mossbauer Isomer Shifts, G.K. Shenoy and F.E. Wagner Eds., North-Holland Publishing Co, Adsterdam-New York-Oxford, Chapter 4 (1978)

[10] Datta A, Sanyal MK, Dhanabalan A, Major SS, J. Phys. Chem. B, 101(45), 9280 (1997)

[11] Bruinsma PJ, Risbud S, Rabolt JF, Stroeve P, Chem. Mater., 8, 2209 (1996)

[12] Cornel RM, Schwertmann U, The Iron Oxides, VCH Publishers, New York (1996)

[13] Sohn BH, Cohen RE, Chem. Mater., 9, 264 (1997)

[14] Zhang JH, Birdwhistell TL, O'Connor CJO, Solid State Commun., 74, 443 (1990)

[15] O'Connor CJO, Research Frontiers in Magnetochemistry, C.J.O. O'Connor Ed., World Scientific Publishing, Inc., London, pp. 109 (1993)

[16] Kommared NS, Tata M, John VT, Lee YS, O'Connor CJO, Akkara JA, Kaplan DL, Chem. Mater., 8, 801 (1996)

[17] Ziolo RF, Giannelis EP, Weinstein BA, O'Horo MP, Ganguly BN, Mehrotra V, Russell MW, Huffman DR, Science, 257, 219 (1992)

[18] Vassiliou JK, Mehrotra V, Russell MW, Giannelis EP, McMichael RD, Shull RD, Ziolo RF, J. Appl. Polym. Sci., 73, 5109 (1993)

[19] Kneller E, Magnetism and Metallurgy, A.E. Berkowitz, and E. Kneller Eds., Academic Press Inc., New York (1969)

[20] Cullity BD, Introduction to Magnetic Materials, Addision-Wesley, Reading, MA (1972)