Silica-graphite filler was prepared via two-step grafting procedure by grafting silica particles onto the expanded graphite. In the first step, isocyanatopropyltriethoxysilane was chemically introduced onto the silica aggregates, which was followed by grafting onto the expanded graphite via urethane linkage in the second step. Successful grafting of silica aggregates onto the graphite was corroborated using Fourier transform infrared spectroscopy and X-ray photoelectron spectroscopy. The presence of a thin graphene layer on silica aggregates corroborated using transmission electron microscopy confirmed the grafting of silica aggregates onto the graphite surface. Styrene-butadiene rubber (SBR) composites with various silica-graphite loadings were prepared by melt processing technique to generate pristine silica and silica-graphite-filled elastomeric composites. Rheometric cure studies revealed that the torque difference (DS) increased with pristine silica loading, when compared to the unfilled SBR system, and this effect is more pronounced on loading silica-graphite filler. Improvements in mechanical properties such as modulus and tensile strength were observed with increasing loading of silica particles and this effect is more pronounced on loading silica-graphite fillers,
In the present work, ruthenium doped titania (RuXTi1-XO2) nanosheet was synthesized by hydrothermal method using titanium tetraisopropoxide and ruthenium trichloride trihydrate as metal precursors. The structural, chemical and morphological properties were determined using X-Ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and Transmission electron microscopy (TEM). The synthesizedRuXTi1-XO2 nanocrystals were used as photocatalyst for the degradation of Reactive Red 198 (RR) dye in aqueous solutions at the room temperature. The photocatalytic activity of the RuXTi1-XO2 nanosheet was evaluated and compared with its control counterpart TiO2. Significant improvement in dye degradation is noted for RuXTi1-XO2, when compared to TiO2. Which is corroborated to the increased visible light absorption due to the presence of ruthenium in the crystallite sites of TiO2 that resulted in well separated photo-generated electron and hole pairs under the light illumination.
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