We treated silica with tris(pentafluorophenyl)borane, B(C6F5)3, to create borane-functionalized support, SiO2–B(C6F5)3 which was then used as a support and co-catalyst for the in situ activated dichloro-zirconocene (Cp2ZrCl2/TIBA) and dimethyl-zirconocene catalyst systems (Cp2Zr(CH3)2) for ethylene polymerization. The surface modifications of SiO2– B(C6F5)3 was investigated by SEM–EDX, FTIR and...

All-solid microstructured optical fibers (MOF) allow the realization of very flexible optical waveguide designs. They are prepared by stacking of doped silica rods or canes in complex arrangements. Typical dopants in silica matrices are germanium and phosphorus to increase the refractive index (RI), or boron and fluorine to decrease the RI. However, the direct interface contact of stacking elem...

boron toxicity usually occurs in arid and saline soils. among all the pollutant'sresource, irrigation water is the most important factor in boron elevating in the soil.modification of boron-rich soils is difficult and in this case, resistant varieties can playan important role in increasing the cultivation in areas with high boron level. to assessthe effects of different concentrations of ...

Surface finishing operation is a very vital aspect of the manufacturing process and would not fully be achieved without abrasives such as emery paper. Some materials used in production like alumina (Al2O3), Boron Carbide (B4C) are expensive thereby limiting their usage. This work aimed at producing abrasive from snail shells, silica (SiO2), epoxy resin while melamine formaldehyde acts hardener....

This preliminary study aims to obtain the lithium compounds from a geothermal brine through solvent extraction. The samples were collected PT Geodipa Energi Geothermal Power Plant in Dieng, Central Java, Indonesia. ICP analysis was conducted measure chemical composition. Brine’s content 62.73 ppm with dominant impurities silica (Si), calcium (Ca), potassium (K), sodium (Na), and boron (B). Sili...

The presence of small amounts of boron in ductile iron is reported to have multiple and sometimes conflicting effects on the mechanical properties of ductile irons. The technical literature up until the early 1990’s states that small amounts of boron is a powerful carbide stabilizing element. Boron levels as low as 0.001% (10 ppm’s or parts per million) stabilize pearlite but larger amounts wer...