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Please use this identifier to cite or link to this item: http://hdl.handle.net/10204/5351

Title: Magnetic characterization of radio frequency heat affected micron size Fe3O4 powders: a bio-application perspective
Authors: Roul, BK
Mishra, DK
Ray, M
Sahu, DR
Mishra, PK
Srinivasu, VV
Pradhan, AK
Keywords: Magnetite Fe3O4
RF heat treatment
Blocking temperature
Issue Date: May-2009
Citation: Roul, BK, Mishra, DK, Ray, M et al. 2009. Magnetic characterization of radio frequency heat affected micron size Fe3O4 powders: a bio-application perspective. Journal of Nanoscience and Nanotechnology, Vol 9(5), pp 3204-3029
Series/Report no.: Workflow request;3767
Abstract: Micron size Fe3O4 powders were chemically prepared and processed by radio frequency (13.56 MHz) oxygen plasma irradiation technique at different elevated temperatures using low radio frequency (RF) power level. Low magnetic field RF superconducting quantum interference device (SQUID) magnetization studies were performed up to a maximum magnetic field of 100 Oe, which was well below the magnetic field tolerance factor of human beings and at different temperatures (down to 5 K). Heat-treated powders in RF oxygen plasma showed significant changes in blocking temperature, magnetization and susceptibility, which are important parameters for bio-applications. It is observed that blocking temperature is decreased under identical RF heat treatment in oxygen plasma and noted to be dependent on average particle size. Microscopic rise in electron temperature during RF heating may likely to enhance the electron-hopping rate between Fe(+2) and Fe(+3) in the octahedral site of Fe3O4 molecular crystal structure, which in turn exhibit changes in blocking temperature including low field magnetization and susceptibility. These properties of Fe3O4 fine powder are likely to play important role in generating and processing biocompatible Ferro-fluid down to nanoscopic size for biomaterials applications.
Description: Copyright: 2009 American Scientific Publishers. This is an ABSTRACT ONLY
URI: http://www.ingentaconnect.com/content/asp/jnn/2009/00000009/00000005/art00060
ISSN: 1533-4880
Appears in Collections:Nanotechnology
Manufacturing science and technology
General science, engineering & technology

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