| Original Articles |
|
|
|
|
Magnetic Behaviour and Heating Effect of Fe3O4 Ferrofluids Composed of Monodisperse Nanoparticles |
| ZHANG Li-Ying;DOU Yong-Hua;ZHANG Ling;GU Hong-Chen |
| National Key Laboratory of Nano/Micro Fabrication Technology, Key Laboratory for Thin Films and Microfabrication of MOE, Research Institute of Micro and Nano Science and Technology, Shanghai Jiaotong University, Shanghai 200030 |
|
| Cite this article: |
|
ZHANG Li-Ying, DOU Yong-Hua, ZHANG Ling et al 2007 Chin. Phys. Lett. 24 483-486 |
|
|
|
|
Abstract Fe3O4 ferrofluids containing monodisperse Fe3O4 nanoparticles with different diameters of 8, 12, 16 and 18nm are prepared by using high-temperature solution phase reaction. The particles have single crystal structures with arrow size distributions. At room temperature, the 8-nm ferrofluid shows perparamagnetic behaviour, whereas the others display hysteresis properties and the coercivity increases with the increasing particle size. The spin glass-like behaviour and cusps near 190K are observed on all ferrofluids according to the temperature variation of field-cooled (FC) and zero-field-cooled (ZFC) magnetization measurements. The cusps are found to be associated with the freezing point of the solvent. As a comparison, the ferrofluids are dried and the FC and ZFC magnetization curves of powdery samples are also nvestigated. It is found that the blocking temperatures for the powdery samples are higher than those for their corresponding ferrofluids. Moreover, the size dependent heating effect of the ferrofluids is also investigated in ac magnetic field with a frequency of 55kHz and amplitude of 200Oe.
|
| Keywords:
47.65.Cb
75.50.+a
87.83.+a
|
|
|
Received: 26 September 2006
Published: 24 February 2007
|
|
|
|
|
|
|
|
[1] Raj K and Moskowitz R 1990 J. Magn. Magn. Mater. 85 233
[2] Hafeli U, Schutt W, Teller J and Zborowski M 1997 Scientific and Clinical Applications of Magnetic Carriers (New York:Plenum Press)
[3] Oswald P et al , Clement O, Chambon C, Schouman-Claeys E and Frija G1997 Magn. Reson. Imaging 15 1025
[4] Hergt R et al, Andra W, d'Ambly C G, Hilger I, Kaiser W A, Richter U and Schmidt H G1998 IEEE Trans. Magn. 34 3745
[5] Jordan A et al , Scholz R, Wust P, Fahling H and Felix R1999 J Magn. Magn. Mater. 201 413
[6] Kim D K et al , Zhang Y, Kehr J, Klason T, Bjelke B and Muhammed M2001 J. Magn. Magn. Mater. 225 256
[7] Luo W et al , Nagel S R, Rosenbaum T F and Rosensweig R E1991 Phys. Rev. Lett. 67 2721
[8] Jonsson T et al, Mattsson J, Djurberg C, Khan F A, Nordblad P and Svedlindhm P1995 Phys. Rev. Lett. 75 4138
[9] Park J et al, Lee E, Hwang N M, Kang M, Kim S C, Hwang Y, Park J G, Noh H J, Kim JY, Park J H and Hyeon T2005 Angew. Chem. Int. Ed. 44 2872
[10] Sun S et al , Zeng H, Robinson D B, Raoux S, Rice P M, Wang S X and Li G2004 J. Am. Chem. Soc. 126 273
[11] Park J et al, Lee E, Hwang N M, Kang M, Kim S C, Hwang Y, Park J G, Noh H J, Kim JY, Park J H and Hyeon T2005 Angew. Chem. Int. Ed. 44 2872
[12] Zhang J, Xu X, Si M, Zhou Y and Xue D 2005 Chin. Phys. Lett.22 2944
[13] Jordan A et al, Scholz R, Hau K M, Johannsen M, Wust P, Nadobny J, Schirra H, SchmidtH, Deger S, Loening S, Lanksch W and Felix R2001 J. Magn. Magn. Mater. 225 118
[14] Chan D C, Kirpotin D B and Bunn P A 1997 Scientific andClinical Applications of Magnetic Carriers (New York: Plenum Press)
[15] Hergt R et al, Hiergeist R, Zeisberger M, Glockl G, Weitschies W, Ramirez L P,Hilger I and Kaiser W A2004 J. Magn. Magn. Mater. 280 358
[16] Hergt R et al, Hiergeist R, Zeisberger M, Schuler D, Heyen U, Hilger I and Kaiser WA2005 J. Magn. Magn. Mater. 293 80
[17] Ma M, Wu Y, Zhou J, Sun Y, Zhang Y and Gu N 2004 J. Magn.Magn. Mater. 268 33
[18] Rosensweig R E 2002 J. Magn. Magn. Mater. 252 370
[19] Zhang L, He R and Gu H C 2006 Mater. Res. Bull. 41 260
[20] Sano K and Doi M 1983 J. Phys. Soc. Jpn. 52 2810 |
|
Viewed |
|
|
|
Full text
|
|
|
|
|
Abstract
|
|
|
|
|
