Aryl appended half-sandwich Ru(ii)–NHC complexes were synthesised and their use as selective catalysts for transfer hydrogenation of aromatic ketones was demonstrated.
The present work reports the effect of Cu addition on the melting point, hardness and electrical resistivity of Sn-57 wt.% Bi eutectic solder alloy. Both binary eutectic Sn-57 wt.% Bi and ternary Sn-(57-x)Bi-xCu (x = 0.1, 0.3, 0.5, 0.7 and 1 wt.%) alloys containing various amounts of Cu were developed by melting casting route. The microstructure of the various solder alloys was analyzed using an optical microscope and a SEM. The variation in melting point, hardness and electrical resistivity of the Sn-Bi eutectic solder alloys with the addition of Cu was determined. The melting point of the eutectic Sn-Bi solder alloy was found to decrease up to the addition of 0.7 wt.% Cu. However, further addition of Cu led to an increase in the melting point of the alloy. Addition of Cu led to an increase in the hardness of the eutectic Sn-Bi solder alloy whereas the electrical resistivity of this alloy was found to increase up to the addition of 0.7 wt.% of Cu beyond which a decrease in the electrical resistivity was observed. A change in the microstructure of the solder alloy was observed when it was reheated above the melting temperature.Keywords: Sn-Bi-Cu; lead-free solder alloys; melting point; DSC/TGA Effect of addition of Cu on the properties of eutectic Sn-Bi solder alloy 213 is 51 MPa to 75 MPa. Its density is 5.765 g/cc and its modulus of elasticity is 41.6 GPa. It has a thermal conductivity of 66.8 W/(m·K) and coefficient of thermal expansion of 0.000022 K −1 [7,8].
Carbon fiber reinforced silicon carbide (SiC) minicomposites were prepared from three variants of commercially available carbon fibers, viz., T300‐3K, T300J‐3K, and T300‐6K. The SiC matrix infiltration was done via chemical vapor infiltration process using methyltrichlorosilane as the precursor. Minicomposites were characterized for the composition and morphology of the matrix material deposited. It was found that the matrix contains 2H‐SiC along with the major phase 3C‐SiC. Cyclic tensile tests were carried out on the composites to understand the damage mechanism and load bearing characteristics under cyclic loading conditions. The dependence of peak and residual strains on the fiber volume fraction was studied. Oxidation of the CMCs in air at 1500°C was studied and the result was explained based on a five part process.
Porous functional materials are highly useful as catalysts, adsorbents, and drug-delivery vehicles. The impact of varying the mole ratio of the organic ligand (BTC, trimesic acid) to iron nitrate on the porosity, surface chemistry, and proton conductivity of Fe 2 O 3 -BTC hybrid nanostructures was thoroughly examined. Variation in the BTC content alters the porosity as well as proton conductivity of the hybrid nanoparticles. The improved accessibility of pores and surface area along with functionalization of the surface by trimesic acid was found to be responsible for enhanced and selective dye adsorption. The adsorption capacity of the best Fe 2 O 3 -BTC hybrid nanomaterial was 200 mg g −1 . The Fe 2 O 3 -BTC hybrid nanomaterial provides pH/adsorbent surface charge-dependent selectivity in the adsorption of positive (e.g., methylene blue) and negative dye (fluorescein) from the aqueous solution of their mixture. In addition, the functionalization of pores in the hybrid nanomaterial provides wettability to the pore channels, which allows the protons to conduct through H-bonded water molecules. As a result, the hybrid nanomaterial exhibits enhanced proton conductivity and electrochemical hydrogen evolution reaction. These findings could be useful to develop similar metal oxide−organic hybrid nanoparticles as better adsorbents and electrocatalysts in comparison to the conventional counterparts (i.e., metal oxide or metal−organic frameworks).
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