Estimation of thermodynamic parameters in 3.Om and 3O.Om liquid crystalline compounds

Rao, D. V. Subba; Pardhasaradhi, P.; Pisipati, V. G. K. M.; Latha, D. Madhavi; Prasad, P.V. Datta

doi:10.1016/j.molliq.2015.06.053

Cited by 3 publications

(2 citation statements)

References 17 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It follows from Figure 11 that for ELP, the calculated values of  increase with the rise of T and C, which is consistent with the increasing tendency of M V for studied solutions (Figure 4) at the concentrations higher than CMC of the studied surfactant determined from the surface tension measurements (Table 1). K ) [32][33][34][35]. These parameters for ELP solutions are presented in Table S1 (Supplementary Materials) and were calculated from the following equations: Having the ELP α values at various temperatures and concentrations, there could be calculated the thermodynamic parameters such as: reduced volume ( V), Moelwyn-Hughes parameter (C 1 ), reduced compressibility ( β), isochoric temperature coefficient of internal pressure (X), Sharma parameter (S 0 ), Huggin's parameter (F), isochoric temperature coefficient of volume expansivity (X ), anharmonic microscopic isothermal Gruneisen parameter (Γ), fractional free volume ( f ), Gruneinsen parameter (Γ p ), isobaric thermo-acoustic parameter (K) and isochoric thermo-acoustic parameter (K ) [32][33][34][35].…”

Section: Introductionmentioning

confidence: 99%

Temperature Effect on the Adsorption and Volumetric Properties of Aqueous Solutions of Kolliphor®ELP

Szaniawska

Krawczyk

2020

Molecules

View full text Add to dashboard Cite

Density, viscosity and surface tension of Kolliphor ® ELP, the nonionic surfactant aqueous solutions were measured at temperature T = 293-318 K and at 5K interval. Steady-state fluorescence measurements have been also made using pyrene as a probe. On the basis of the obtained results, a number of thermodynamic, thermo-acoustic and anharmonic parameters of the studied surfactant have been evaluated and interpreted in terms of structural effects and solute-solvent interactions. The results suggest that the molecules of studied surfactant at concentrations higher than the critical micelle concentration act as structure makers of the water structure.Molecules 2020, 25, 743 2 of 13 hand to describe the behavior of surfactants in relation to two non-miscible phases and the range of temperatures at which they are active, some adsorption and volumetric properties of the solution of such surfactants are needed. Thus, the purpose of the presented studies was to determine some adsorption, volumetric, thermo-acoustic as well as anharmonic properties of aqueous solutions of Kolliphor ® ELP (ELP), a purified grade of EL, by surface tension, density and viscosity measurements at T = 293-318 K with 5 K interval. Moreover, the properties of the solutions were studied by means of steady-state fluorescence measurements. Based on the results, the analysis was applied to study different molecular interactions in the solutions taking into account the change of these properties depending on concentration and temperature. Results and Discussion

show abstract

Section: Introductionmentioning

confidence: 99%

Temperature Effect on the Adsorption and Volumetric Properties of Aqueous Solutions of Kolliphor®ELP

Szaniawska

Krawczyk

2020

Molecules

View full text Add to dashboard Cite

show abstract

“…Next, from the values of α at different temperatures and concentrations, it is possible to calculate the following thermodynamic parameters: reduced volume ( V), Moelwyn-Hughes parameter (C 1 ), reduced compressibility ( β), isochoric temperature coefficient of internal pressure (X), Sharma parameter (S 0 ), Huggins parameter (F), isochoric temperature coefficient of volume expansivity (X ), anharmonic microscopic isothermal Gruneisen parameter (Γ), fractional free volume ( f ), Gruneisen parameter (Γ p ), isobaric thermo-acoustic parameter (K) and the isochoric thermo-acoustic parameter (K ) [31][32][33][34].…”

Section: Introductionmentioning

confidence: 99%

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

Szaniawska

Taraba

2018

Colloids and Interfaces

View full text Add to dashboard Cite

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.

show abstract

Investigations on three and two coefficient Cauchy model for refractive indices of 5O.m and 6O.m liquid crystals

Shekar¹,

Latha

Pisipati

2017

Optical Materials

View full text Add to dashboard Cite

Estimation of thermodynamic parameters in 3.Om and 3O.Om liquid crystalline compounds

Cited by 3 publications

References 17 publications

Temperature Effect on the Adsorption and Volumetric Properties of Aqueous Solutions of Kolliphor®ELP

Temperature Effect on the Adsorption and Volumetric Properties of Aqueous Solutions of Kolliphor®ELP

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

Investigations on three and two coefficient Cauchy model for refractive indices of 5O.m and 6O.m liquid crystals

Contact Info

Product

Resources

About