Effect of Temperature and Solvent on the Ultrasonic Velocity and Allied Acoustical Parameters of the Epoxy Oleate of 9,9′-Bis(4-hydroxyphenyl) Anthrone-10 Solutions

Ultrasonic Speed and Related Thermo-acoustical Parameters of Solutions of 1,1′-Bis(3-methyl-4-ethoxyacetylphenoxy)cyclohexane at Four Different Temperatures

“…Using q, g and U data, various acoustical parameters such as the acoustical impedance (Z), isentropic (adiabatic) compressibility (j S ), internal pressure (p), free volume (V f ), intermolecular free path length (L f ), van der Waals constant (b), viscous relaxation time (s), classical absorption coefficient (a/f 2 ) cl , Rao's molar sound function (R m ), and solvation number (S n ) of BMEPC solutions were determined and were correlated with C at the different T. The variation of Z, j S, p, V f , L f , b, s (a/f 2 ) cl and R m with concentration at 30°C for all the solvent systems studied are shown in Figs. 5,6,7,8,9,10,11,12, and 13, respectively. The least-squares equations along with regression coefficients (R 2 ) are presented in Tables 3, 4, and 5, from which it is observed that excellent correlations between a given parameter and concentration of BMEPC are found at the different temperatures.…”

“…The structure-forming tendency is primarily due to solvent-solute interactions, while destruction of the previously formed structure is due to thermal fluctuations. When the thermal energy is greater than that of interaction energy, it causes destruction of the structure previously formed [9,10].…”

Ultrasonic Speed and Thermodynamic Parameters of Novel Epoxy Resin Solutions Based on Cardo Symmetric Double Schiff Bases at 308.15 K

“…3 The plots of b against C at 308.15 K relaxation time τ have been determined by using the ρ, η, and U data for resin solutions as described in our recent publications [30][31][32][33], and were correlated with the concentration C. The least-squares plots along with least-square equations are presented in Figs. 1-5 from which it is clear that good-to-excellent correlations occur between a particular parameter and C. Both b and τ vary linearly with C except for ESDSB-2-CF solutions in which τ varied nonlinearly due to specific molecular interactions.…”

Thermo-Acoustical Study of Biologically Active 1,1’-Bis(3-Methyl-4-Carboxyethylphenoxy) Cyclohexane at Four Different Temperatures

“…The structure forming tendency is primarily due to solvent-solute interactions, while destruction of structure formed previously is due to thermal fluctuations. When thermal energy is greater than that of interaction energy, it causes destruction of the structure formed previously [11,12]. Dipole-dipole interactions of the opposite type favours structure formation, while of the same type favour structure breaking tendency.…”

“…Further ultrasonic sound velocity measurements have been used to study the nature of molecular interactions in various liquid mixtures and solution of organic and inorganic compounds [8][9][10], solutions of polymers [11,12], pharma materials [13,14] and ionic interactions in electrolytes solutions [15,16].…”