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Sonochemical formation of bioactive nanoparticles and their embedment in polyurethane surfaces

Chytrosz Paulina, Gołda-Cępa Monika, Cwilklik Łukasz, Kulig Waldemar, Kotarba Andrzej

Engineering of Biomaterials

2021

Vol. 24, no. 163

Synthesis and characterization of nanostructured molybdenum & tungsten carbide materials, and study of diffusion model

Covington L., Munirathinam K., Islam A. W., Roberts K. L.

Polish Journal of Chemical Technology

2012

Vol. 14, nr 1

28-34

Powders of two molybdenum carbides (Mo2C and MoC1-x) and tungsten carbide (WC) were prepared by means of temperature programmed reaction (TPR) method. Mo2C and MoC1-x were synthesized by reacting MoO3 with a preselected molar ratio of methane/hydrogen and carbon monoxide/hydrogen gas mixtures respectively. WC was prepared using tungsten oxide (WO3) and a methane/hydrogen gas mixture. These carbides were ultrasonically dispersed in de-ionized water. Samples were characterized using room temperature x-ray diffraction and scanning microscopy. A kinetic diffusion model is also studied to determine diffusivities in solids where the diffusing species desorbs or reacts at the external surfaces, and where the diffusivity does not vary appreciably with concentrations. The method involves measuring the flux of the diffusive species into the solid under the influence of a temperature program.