Investigation on Temperature-Dependent Volumetric and Acoustical Properties of Homologous Series of Glycols in Aqueous Sorbitol Solutions

Κaur, Kirandeep; Juglan, K.C.; Kumar, Harsh

doi:10.1021/acs.jced.7b00501

Cited by 40 publications

(20 citation statements)

References 64 publications

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“…Pd-catalyzed reactions (the importance of these can be seen in the 2010 Nobel prize award for their discovery) have also been carried out in PEG under both homocatalytic and heterocatalytic conditions where Pd is immobilized onto a porous silica material. − PEGs have also been successfully used as components in deep eutectic solvents. − Despite all of these successes, there are only limited experimental and theoretical studies on the dynamics of neat PEG. − Experimental physicochemical properties of PEGs are needed to further this effort. In this respect, densities and viscosities have been repeatedly reported for several polydisperse PEGs usually as part of studies on binary mixtures involving polydisperse PEGs. − The polydisperse PEGs are composed of mixtures of PEG oligomers with approximately a Gaussian mole fraction distribution around the mean chain length. ,, It is likely that the exact mole fraction distribution may vary from vendor to vendor and possibly even from batch to batch. Unfortunately, a composition analysis of polydisperse PEGs is typically not included in the above cited studies.…”

Section: Introductionmentioning

confidence: 99%

Densities, Viscosities, and Self-Diffusion Coefficients of Ethylene Glycol Oligomers

Hoffmann

Horowitz

Gutmann³

et al. 2021

J. Chem. Eng. Data

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Polyethylene glycol (PEG) is gaining interest as an alternative green solvent in chemical synthesis and processing. This report presents density and viscosity data from 293.15 K to 358.15 K as well as self-diffusion coefficient data from 298.15 K to 358.15 K for oligomers of PEG from di-to nonaethylene glycol. The results were obtained by extrapolation from measurement series where water, the most common impurity in PEGs, was intentionally added in several increments. The obtained results are carefully compared to literature data, which are widely available only for density and viscosity, and only for the lower oligomers. Densities are found to be linearly dependent on temperatures for all studied oligomers. The temperature dependence of viscosity and self-diffusion coefficients show only slight deviations from the Arrhenius equation over the investigated temperature range. The activation energies obtained from the viscosity data agree well with the activation energies from the self-diffusion coefficient data and appear to be linearly dependent with respect to the number of ethylene oxide repeat units in the PEG oligomer. This linearity combined with the observation that the pre-exponential factor appears to be the same for all studied oligomers may serve as a tool to estimate viscosities and self-diffusion coefficients for higher oligomers within the investigated temperature range. The densities of the oligomers all fall within a rather narrow range without a clear trend in homologous series.

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Section: Introductionmentioning

confidence: 99%

Densities, Viscosities, and Self-Diffusion Coefficients of Ethylene Glycol Oligomers

Hoffmann

Horowitz

Gutmann³

et al. 2021

J. Chem. Eng. Data

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“…The partial molar volume is obtained applying the least-squares fitting of the apparent molar volume ( V ϕ ) values and the values of intercept V ϕ 0 , including the standard errors that are calculated from least-squares fitting, and are shown in Table . The positive values of V ϕ 0 increase along with the molar mass of poly(ethylene glycol)s, from PEG 400 to PEG 4000, as graphically represented in Figure , thus suggesting the presence of a strong hydrogen bond interaction in the oxygen atoms of poly(ethylene glycol)s and hydrogen atoms of water. , The survival of the solvent–solvent interaction is indicated by the positive V ϕ 0 values, wherein the co-spheres of two ionic species overlap with one another. This increases the volume, whereas when the hydrophobic and hydrophobic and ion and hydrophobic groups overlap with each other, a decrease in the volume is observed, as stated by the overlap model co-sphere. − Further, the positive values of V ϕ 0 data describe the dominance of the ion–hydrophilic interaction over the hydrophobic–hydrophobic interaction.…”

Section: Results and Discussionmentioning

confidence: 90%

“…The positive values of V ϕ 0 increase along with the molar mass of poly(ethylene glycol)s, from PEG 400 to PEG 4000, as graphically represented in Figure 4, thus suggesting the presence of a strong hydrogen bond interaction in the oxygen atoms of poly(ethylene glycol)s and hydrogen atoms of water. 32,33 The survival of the solvent−solvent interaction is indicated by the positive V ϕ 0 values, wherein the co-spheres of two ionic species overlap with one another. This increases the volume, whereas when the hydrophobic and hydrophobic and ion and hydrophobic groups overlap with each other, a decrease in the volume is observed, as stated by the overlap model co-sphere.…”

Section: Methodsmentioning

confidence: 99%

Volumetric and Ultrasonic Studies of Molecular Interactions of PEG 400 and PEG 4000 in Aqueous Niacin Solutions at Different Temperatures

2021

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At multiple temperatures, 288.15–318.15 K, the density and speed of sound values for PEGs of molecular weights 400 and 4000 in aqueous niacin solutions were measured at concentrations of 0.07, 0.08, and 0.09 mol·kg–1. Utilizing these experimental data, the apparent molar properties and partial molar properties were determined to analyze the interactions in aqueous niacin solutions with poly(ethylene glycol)s (400/4000). The volumetric parameters, such as apparent molar volume, V ϕ, partial molar volume, V ϕ 0, and partial molar volume of transfer, ΔV ϕ 0, are obtained using experimental density values, while the acoustic parameters, i.e., apparent molar isentropic compression, K ϕ,S, partial molar isentropic compression, K ϕ,S 0, and partial molar isentropic compression of transfer, ΔK ϕ,S 0, are determined with the speed of sound data. These positive volumetric apparent and partial molar properties suggest the presence of strong solute–solvent interactions. The partial molar expansibilities (E ϕ 0) along with their first derivative (∂E ϕ 0/∂T)P were calculated. Further, pair and triplet coefficients are obtained using partial molar isentropic compression and partial molar volume of the transfer, respectively.

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“…Both are non-toxic and are soluble in water [8][9][10]. The past studies shows that rather than pure liquids, mixed liquids accomplish more properties and has many applications in industries such as chemical and pharmaceutical [11][12][13][14][15][16]. The present work represents the combination of propylene and hexylene glycols with chlorhexidine at different temperatures which further gives information about molecular interactions in the system with the help of this ultrasonic study.…”

Section: Introductionmentioning

confidence: 99%

Acoustic studies of molecular interactions of chlorhexidine with glycols at different temperatures

Kaur

Juglan

Kumar

2022

J. Phys.: Conf. Ser.

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The Density and Ultrasonic Velocity of chlorhexidine with glycols have been measured at different range of temperatures for different concentrations. Ultrasonic and volumetric data has been used to calculate various parameters such as adiabatic compressibility, acoustic impedance, available volume, molar volume, intermolecular free length, Rao’s constant, Van Der Waal Constant, Wada’s constant, relative intensity, and effective molecular weight. The calculated various parameters suggest solute-solvent interactions occurring in the liquid mixtures. Some other parameters suggest dipole-dipole interactions or formation of complex or charge transfer interactions.

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Investigation on Temperature-Dependent Volumetric and Acoustical Properties of Homologous Series of Glycols in Aqueous Sorbitol Solutions

Abstract: In the present study, the combination of volumetric and acoustical studies is used to investigate the interactions of ethylene glycol, diethylene glycol, and tri-

Cited by 40 publications

References 64 publications

Densities, Viscosities, and Self-Diffusion Coefficients of Ethylene Glycol Oligomers

Densities, Viscosities, and Self-Diffusion Coefficients of Ethylene Glycol Oligomers

Volumetric and Ultrasonic Studies of Molecular Interactions of PEG 400 and PEG 4000 in Aqueous Niacin Solutions at Different Temperatures

Acoustic studies of molecular interactions of chlorhexidine with glycols at different temperatures

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