Systematic Control of Particle Size in Rapid Open-Vessel Microwave Synthesis of K-OMS-2 Nanofibers

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Abstract

Multigram quantities of manganese oxide (K-OMS-2) nanomaterials in the size range of 4−20 nm and with very high surface areas up to 227 m2/g were produced rapidly via microwave-reflux route with use of mixed aqueous and nonaqueous solvents. The formation process, particle size, crystallite size, crystal structure, and properties of these nanomaterials were characterized by X-ray diffraction, scanning electron microscopy (SEM), transmission electron microscopy (TEM), thermogravimetric analysis (TGA), differential scanning calorimetry (DSC), infrared spectroscopy (FT-IR), Raman spectroscopy, and nitrogen adsorption−desorption. The OMS-2 nanofiber diameter was systematically controlled by varying the concentration or type of the cosolvent. Catalytic studies of these K-OMS-2 nanomaterials for oxidation of anisyl alcohol were performed. These nanomaterials show excellent catalytic activity when compared with conventionally prepared bulk OMS-2 catalysts.

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