Volumetric and isentropic compressibility behaviour of aqueous solutions of (polyvinylpyrrolidone+sodium citrate) at T=(283.15 to 308.15)K

2007 ◽  
Vol 39 (8) ◽  
pp. 1118-1124 ◽  
Author(s):  
Rahmat Sadeghi ◽  
Fatemeh Ziamajidi
Keyword(s):  
Aqueous Solutions ◽  
Sodium Citrate ◽  
Isentropic Compressibility

scholarly journals Micellar Parameters of Aqueous Solutions of Tween 20 and 60 at Different Temperatures: Volumetric and Viscometric Study

2018 ◽  
Vol 2 (3) ◽  
pp. 34 ◽  
Author(s):  
Katarzyna Szymczyk ◽  
Magdalena Szaniawska ◽  
Anna Taraba
Keyword(s):  
Aqueous Solutions ◽  
Internal Pressure ◽  
Isentropic Compressibility ◽  
Bulk Water ◽  
Tween 20 ◽  
Hydration Numbers ◽  
Sorbitan Monolaurate ◽  
Different Temperatures ◽  
Tween 60 ◽  
Viscometric Study

Density, viscosity and speed of sound of aqueous solutions of nonionic surfactants such as polyoxyethylene (20) sorbitan monolaurate (Tween 20) and polyoxyethylene (20) sorbitan monostearate (Tween 60) at T = 293, 303 and 313 K are reported. From these measured values different parameters such as, for example, isentropic compressibility, molecular free length, acoustic impedance, primary hydration numbers and internal pressure have been calculated and employed to discuss molecular packing, structural alteration and molecular interactions. The variation in these parameters with temperature indicates that the mobility of surfactant molecules increases the disordered state of the liquid (surfactant + water) due to irregular packing of the molecules. Also, for Tween 20 solutions, more conversion to bulk water of the structured water molecules was observed, obtaining lower compressibilities and higher values of hydration numbers as well as internal pressure for a given T.

scholarly journals Ultrasonic studies on temperature dependence of ion solvent interactions of ionic liquid 1-butyl-2,3- dimethylimidazolium chloride in aqueous solutions of tetra-n-butylammonium bromide at T = (298.15 to 313.15) K

2020 ◽  
Vol 10 (2) ◽  
pp. 5259-5265
Keyword(s):  
Aqueous Solutions ◽  
Isentropic Compressibility ◽  
Effect Of Temperature ◽  
Ammonium Bromide ◽  
Nonlinear Parameters ◽  
Solvent Interactions ◽  
Acoustical Properties ◽  
Wada’S Constant ◽  
Rao’S Constant ◽  
Different Temperatures

The densities (ρ), and ultrasonic velocities (u) of 1-Butyl-2, 3-dimethylimmidazolium chloride,[bdmim]Cl in aqueous solutions of Tetra-n-butyl ammonium bromide over the complete range of concentrations has been calculated at different temperatures T= (298.15 to 313)K. Experimentally obtained values of ρ and u were used to calculate the parameters like acoustic impedance (Z), isentropic compressibility (βS), molar sound velocity (Rao’s constant) (R), molar compressibility (Wada’s constant)(W), intermolecular free length (Lf), co-efficient of thermal expansion (α), heat capacity ratio (γ), isothermal compressibility (βT) and nonlinearity parameters (B/A). The final results obtained were analyzed to understand the ion-solvent and ion-ion interaction so taking place in the solutions. Further, the effect of temperature on the ion solvent interactions was discussed. Ion-solvent interactions are affected by the thermo acoustical properties and by nonlinear parameters.

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