Pressure dependent ultrasonic properties of hcp hafnium metal

The elastic and ultrasonic properties have been evaluated at room temperature between the pressure 0.6 and 10.4 GPa for hexagonal closed packed (hcp) hafnium (Hf) metal. The Lennard-Jones potential model has been used to compute the second and third order elastic constants for Hf. The elastic constants have been utilized to calculate the mechanical constants such as Young’s modulus, bulk modulus, shear modulus, Poisson’s ratio, and Zener anisotropy factor for finding the stability and durability of hcp hafnium metal within the chosen pressure range. The second order elastic constants were also used to compute the ultrasonic velocities along unique axis at different angles for the given pressure range. Further thermophysical properties such as specific heat per unit volume and energy density have been estimated at different pressures. Additionally, ultrasonic Grüneisen parameters and acoustic coupling constants have been found out at room temperature. Finally, the ultrasonic attenuation due to phonon–phonon interaction and thermoelastic mechanisms has been investigated for the chosen hafnium metal. The obtained results have been discussed in correlation with available findings for similar types of hcp metals.

Intermolecular Interactions of Anti-Tuberculosis Drugs with Different Solvents: A Review

Drugs' action in the human body is called pharmacodynamics. A drug is any chemical substance that causes a change in an organism's psychology. Today's world is suffering from a common disease called tuberculosis (TB). TB is a common bacterial infection caused by mycobacterium tuberculosis. So, to fight against such type of infection, the study of ion-solvent interaction plays a significant role. To understand molecular interactions, solution properties of anti-TB drugs with different solvents at different temperatures, various physicochemical properties such as volumetric properties, thermo-acoustical properties, viscometric and conductometric properties etc., can be studied. In the present review, the emphasis has been given to the volumetric and ultrasonic properties to study anti-TB drugs' inter-molecular interactions in different solvents.