Preparation of cellulose-based biocompatible suspension of nano-sized /spl gamma/-Al/sub x/Fe/sub 2-x/O/sub 3/

We have been able to synthesize /spl gamma/-Al/sub x/Fe/sub 2-x/O/sub 3/ (0.07/spl les/x/spl les/1) in the size range 5-30 nm by wet chemical method. X-ray diffraction patterns confirm that all the as prepared samples were mono crystalline except the one with x=1.0 which was amorphous. With Al/sup 3+/ substitution average size of the particles ranges between 5 and 30 nm. Al/sup 3+/ has a tendency to occupy the octahedral site of spinel structure reducing the net magnetization. This was confirmed from the Mo/spl uml/ssbauer spectra and magnetization measurement data. We could make suspension of /spl gamma/-Al/sub 0.07/Fe/sub 1.93/O/sub 3/ in cellulose dispersed water. This showed a good degree of biocompatibility with HeLa cells.