In this work, flexible and free-standing films of bio-composite of carboxymethylated cellulose nanofibers (CMCNF) and cobalt ferrite (CFO) nanoparticles (NPs) have been fabricated using insitu chemical route. Control over CFO fraction (1% -25%) in CMCNF matrix was achieved by adjusting volume of the iron and cobalt precursors. Free-standing films of CMCNF-CFO biocomposite were characterized using X-ray diffraction, spectroscopic, microscopic, thermal and Magnetic measurements. The Raman and X-ray absorption near edge spectroscopy studies confirms the formation of CFO in CMCNF matrix. The microscopic studies revealed that CMCNF fibers are decorated with CFO NPs having size of the order of ∼ 25 nm. Comparison of the thermal properties of CMCNF and CMCNF -CFO composites shows that thermal stability improves as CFO content increases. Finally, preliminary results on a method to create 3D patterns of CMCNF -CFO nanocomposite having lateral dimensions ∼ 1.2 μm were presented that pave the way to new uses of biocomposites.[a] Dr. . (a) AFM tapping mode height image of CMCNF-CFO25 composite on silicon substrate. (b) Line profile of the pattern to show width and height of the patterns. (c) AFM 3D height image of the CMCNF-CFO25 composite patterned on silicon substrate. 2 3 4 5 6 7 8
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