Magnetically modified bentonite as a possible contrast agent in MRI of gastrointestinal tract
H. Bartonkova, M. Mashlan, I. Medrik, D. Jancik, and R. Zboril
Research Centre of Nanomaterials, Palacký University, Svobody 26, 771 46 Olomouc, Czech Republic
Received: 9 November 2006 Revised: 10 April 2007 Accepted: 16 April 2007
Abstract: A composite of iron oxide nanoparticles and mineral matrix has been studied by XRD, Mössbauer spectroscopy, and TEM. Magnetite and superparamagnetic magnetite have been identified by Mössbauer spectroscopy in the nanocomposite. A relationship between the hyperfine parameters and iron oxide particle size has been confirmed by TEM. The optimal concentration of “magnetite—bentonite” composite, when the MRI signal is fully reduced, was found for using this composite as a negative contrast agent.
Keywords: magnetite - bentonite - nanoparticles - MRI - Mössbauer spectroscopy
Full paper is available at www.springerlink.com and www.degruyter.com.
Chemical Papers 61 (5) 413–416 (2007)