ViscosityBCoefficients and Activation Parameters of Viscous Flow for Hexanedioic Acid in Aqueous Dextran Solution

2007 ◽  
Vol 52 (3) ◽  
pp. 676-682 ◽  
Author(s):  
Yun Zhang ◽  
Tong-Chun Bai ◽  
Ji-Qing Xie
Keyword(s):  
Viscous Flow ◽  
Activation Parameters ◽  
Dextran Solution ◽  
Aqueous Dextran ◽  
Hexanedioic Acid

scholarly journals Study of Thermodynamic and Transport Properties of Glycine, Diglycine, and Triglycine in Aqueous Tartrazine at Different Temperatures

2009 ◽  
Vol 64 (11) ◽  
pp. 758-764 ◽  
Author(s):  
Anwar Ali ◽  
Rajan Patel ◽  
Shahjahan Khan ◽  
Vidiksha Bhushan
Keyword(s):  
Viscous Flow ◽  
Activation Parameters ◽  
Partial Molar Volumes ◽  
Molar Refraction ◽  
Viscosity Data ◽  
Molar Volumes ◽  
Viscosity Coefficients ◽  
Different Temperatures ◽  
Refractive Index Data ◽  
Amino Acid Glycine

The densities (ρ), viscosities (η), and refractive indices (nD) of (0.01, 0.05, 0.10, 0.15, and 0.20 m) amino acid, glycine, and peptides, diglycine and triglycine in 0.01 m aqueous tartrazine solution were determined at 288.15, 293.15, 298.15, 303.15, 308.15, and 313.15 K. The density data were utilized to evaluate apparent molar volumes (φv) which, in turn, were used to determine partial molar volumes (φv ◦) using Masson’s equation. The transfer volumes were also calculated. The viscosity data were analyzed using the Jones-Dole equation to determine the viscosity coefficients and the activation parameters. The activation parameters of viscous flow were obtained to throw light on the mechanism of viscous flow. The molar refraction was calculated using the refractive index data. The results were interpreted in the light of ion-ion, ion-nonpolar, and nonpolar-nonpolar interactions and the effect of increasing hydrophobicity as we move from glycine to triglycine on these interactions in presence of the dye tartrazine was also investigated.

scholarly journals Intermolecular Interaction of Aqueous Dextran with Urea

2019 ◽  
Vol 8 (11) ◽  
pp. 742-748
Keyword(s):  
Isentropic Compressibility ◽  
Structural Rearrangement ◽  
Urea Solution ◽  
Ultrasonic Speed ◽  
Acoustical Parameters ◽  
Intermolecular Free Length ◽  
Different Temperatures ◽  
Gibb’S Free Energy ◽  
Dextran Solution ◽  
Aqueous Dextran

In this paper, the authors have given information regarding intermolecular interactions of aqueous dextran solution in urea. The behavior of dextran in urea has been examined by the help of ultrasonic interferometer working at frequency 5MHz at different temperatures ranging from 303 K to 323 K in 5K interval. Ultrasonic speed, density, viscosity measurements have been used for the evaluation of thermodynamic parameters like Gibb’s free energy (ΔG) as well as acoustical parameters are acoustic impedance (Z), isentropic compressibility (β), intermolecular free length (Lf ) and relaxation time (τ), etc. The results have been used to throw light on the nature of the interaction among solute and solvent, interpreted in the light of structural rearrangement occurs in the aqueous dextran and urea solution.

Thermodynamic behaviour of adenosine in water–DMSO mixtures in the presence of K+ and Ca2+ ions at 25, 30, 35, and 40 °C

1985 ◽  
Vol 63 (6) ◽  
pp. 1180-1184 ◽  
Author(s):  
Anil K. Puri
Keyword(s):  
Transition State ◽  
Viscous Flow ◽  
Molar Volume ◽  
Partial Molar Volume ◽  
Activation Parameters ◽  
Volume Formula ◽  
Thermodynamic Behaviour ◽  
Partial Molar Compressibility ◽  
Viscosity B Coefficient ◽  
B Coefficients

Partial molar volume [Formula: see text] partial molar compressibility [Formula: see text] Jones–Dole viscosity B coefficient, and solute activation parameters of adenosine in water–DMSO mixtures in the presence of Ca2+ and K+ ions have been calculated from ultrasonic, volumetric, and viscometric studies at 25, 30, 35, and 40 °C(± 0.01° C). The results are discussed in terms of the Jones–Dole viscosity B coefficients and the transition state parameters for viscous flow.

Thermodynamic activation parameters for viscous flow of aqueous solutions of butylamines

2006 ◽  
Vol 44 (5) ◽  
pp. 501-512 ◽  
Author(s):  
Muhammad A. Saleh ◽  
Shamim Akhtar ◽  
M. Shamsuddin Ahmed ◽  
Muhammad A. R. Khan
Keyword(s):  
Aqueous Solutions ◽  
Viscous Flow ◽  
Activation Parameters ◽  
Thermodynamic Activation Parameters

High pressure–temperature aqueous oxidations. III. A kinetic study of the enolization and oxidation of cyclohexanone

1988 ◽  
Vol 66 (2) ◽  
pp. 294-299 ◽  
Author(s):  
John W. Thomas ◽  
Jay E. Taylor
Keyword(s):  
High Pressure ◽  
Kinetic Study ◽  
Aqueous Media ◽  
Activation Parameters ◽  
Oxygen Molecule ◽  
First Order ◽  
Partial Pressures ◽  
Butanedioic Acid ◽  
Pentanedioic Acid ◽  
Hexanedioic Acid

The rates of enolization of cyclohexanone have been determined at 145 and 172 °C in D2O and with buffers. The rates of oxidation were evaluated at temperatures of 145, 172, and 193.5 °C with oxygen partial pressures of 20.4 to 131 atm. The rate of enolization was 10–160 times faster than the rate of oxidation thereby supporting the previously proposed concept of enol intermediacy for the oxidation of ketones. The oxidation was first order in cyclohexanone and 1/2 order in oxygen. The rate of oxidation was increased by the addition of traditional phenolic inhibitors. The products isolated were formic, acetic, butanedioic, pentanedioic, hexanedioic, and 5-oxohexanoic acids. The activation parameters were calculated to be ΔH≠, 22 kcal/mol; ΔS≠, −27 eu, log A, 7.6 for the oxidation and ΔH≠, 12 kcal/mol; ΔS≠, −42.3 eu, log A, 4.13 for the enolization. Based on these observations a mechanism has been postulated whereby an oxygen molecule forms a transitory adduct with two enolates of cyclohexanone. The latter may then split by a reversible reaction to form an intermediate which may then isomerize or oxidize to either 2-hydroxycyclohexanone or 1,3-cyclohexanedione. Upon further oxidation the former yields hexanedioic acid. The latter then undergoes a reverse condensation in the aqueous media to 5-oxohexanoic acid which upon further oxidation yields formic plus pentanedioic acid and acetic plus butanedioic acid.

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