Papers by Keyword: Hexane

Abstract: Ultrasonic velocity and density of salicilaldehyde with iodine in hexane has been measured at 293.15K, 298.15K, 303.15K and 308.15K in different concentration. Ultrasonic velocity has been measured using single frequency interferometer at 2MHz (Model F-81). By using the Ultrasonic velocity (u), density (ρ) and coefficient of viscosity (η) and the other acoustical parameters adiabatic compressibility (κ), free length (L_f), interaction parameter (α), Free volume (V_f) were calculated. The addition of hexane with a mixture leads to a compact structure due to presence of dipolar type interaction. This contributes to the decrease in free volume values and the internal pressure shows an increasing trend. The results have been discussed in terms of solute-solute and solute-solvent interactions between the component and the compatibility of these methods in predicting the interactions in these mixtures has also been discussed.Key Words salicilaldehyde, iodine, hexane, Ultrasonic velocity, molecular interactions.

Abstract: This works presents a study on anti friction properties, of fully formulated SAE 20W 40 grade motor oil dispersed with surface modified WS₂ and MoS₂ nanoparticles. WS₂ and MoS₂ particles of 0.05 wt. % and 0.1 wt. % have been dispersed in SAE 20W 40 motor oil by Sonication and tested for tribological behavior on pin on disc apparatus as per ASTM G99 standards. The friction coefficient values for base oil and oil dispersed with WS₂ and MoS₂ nanoparticles have been evaluated and compared to obtain the performance analysis. Performance graphs have plotted for the base oil and oil dispersed with nanoparticles for comparison. The oils with dispersed nanoparticles have shown enhanced performance in comparison to the base oils in terms of anti friction properties.

Abstract: Usual process for production of W-Cu nanocomposite is ball–milling and sintering of W and Cu mixed powder. Recently, mechanochemical process (MCP) using WO3 and CuO powders have been developed. In the present work, the influence of the ball-milling time from 1 to 30 hour, milling atmosphere such as Argon and Hexane as Process Control Agent (PCA) and weight ratio of ball to powder on characteristics of WO3-CuO was studied. The microstructure of WO3–CuO powder prepared by milling was investigated by x-ray diffraction (XRD) and scanning electron microscopy (SEM). Results show that, the grain sizes of the WO3 and CuO in the ball-milled powder mixture were significantly decreased with increasing the milling time. Those of each oxide ball–milled in Argon and Hexane atmosphere for 30 and 20 hour were about 98 and 84 nm, respectively. After milling of 20 hour in Hexane as PCA, the powder had a homogeneously mixed structure and the average size of WO3– CuO powders was determined to about 230nm.