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Silicon carbide nanowires were produced from carbon blacks at 1473 K and their microstructure was characterized by TEM, X-ray diffraction, FTIR and Raman spectroscopy. Nanowires of uniform diameters, the smallest averaging 10 nm, and narrow size distribution were obtained from graphitized carbon blacks, and their morphology depends on the properties of carbon black pecursors. High concentration of...
Novel bulk diamond composites with nano size grain and nanocrystalline SiC bonding were sintered under high-pressure, high-temperature condi- tions. Nanostructured SiC matrix resulted in improved fracture toughness of the composites. Samples were prepared by high-energy ball milling and thorough powder mixing. Particular attention was paid to the diamond graphitization process, phase composition and...
We use atomic force microscopy (AFM) to characterize the structure of carbon black aggregates. From the images we determine the lateral sizes and the height of the aggregates and from this data we calculate the flatness index. The flatness indices reveal that aggregates generally exhibit anisotropy, in the form of a reduction of aggregate breadth, or flatness, in one direction. The flat sides tend...
Porous sol-gel glass with progesterone and estradiol are manufactured using two different techniques. Steroids can be introduced into the solution during the initial stages of the sol-gel process by mixing TEOS (tetraethyl orthosilicate) with alcohol and water or alternatively a stabilized sample fired at temperature 750 o C can be impregnated with a hormone by immersing it in a steroid solution...
Fractal analysis of adsorption isotherms is used to study the surface roughness of carbon blacks graphitized at 3000 K. Gases of various molecular sizes (nitrogen, argon, ethane, propane, and butane) are adsorbed on different grades of carbon black. Using the molecular yardstick method, it is found that the surface fractal dimension of graphitized carbon black is 2.0±0.1 and is independent of carbon...
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