Viscosities of l-Phenylalanine, l-Leucine, l-Glutamic Acid, or l-Proline + 2.0 mol·dm⁻³ Aqueous NaCl or 2.0 mol·dm⁻³ Aqueous NaNO₃ Solutions at T = (298.15 to 328.15) K

Abstract

Viscosity coefficients of L-phenylalanine, L-leucine, L-glutamic acid, or L-proline in 2.0 mol • dm -3 aqueous NaCl or 2.0 mol • dm -3 aqueous NaNO 3 systems have been determined as a function of molal concentrations of amino acids at temperatures of (298.15, 303.15, 308.15, 313.15, 318.15, 323.15, and 328.15) K. Viscosity coefficients vary linearly with an increase in molal concentration of the amino acids. The trends of variation of viscosity values with an increase in molal concentration of L-phenylalanine, L-leucine, L-glutamic acid, and L-proline in 2.0 mol • dm -3 aqueous NaCl and 2.0 mol • dm -3 aqueous NaNO 3 solutions and with an increase in temperature have been ascribed to the solute-solvent interactions operative in the solutions. The computed Jones-Dole B-coefficients have been also interpreted in terms of solute-solvent interactions.

Volumetric, Viscometric, and Refractive Index Behavior of 7-Hydroxy-4-methylcoumarin in Aqueous Ethanol or 1-Propanol Solutions in the Temperature Range of (293.15 to 313.15) K

“…The viscosity data of 7H4MC + ethanol or propanol + water system listed in Table are analyzed with the Jones–Dole equation: , ( η r − 1 ) / c 1 / 2 = ψ = A + B c 1 / 2 where η r is the relative viscosity. It is calculated by the equation: η normalr = η / η 0 = false( ρ t false) / false( ρ 0 t 0 false) in which ρ, ρ 0 , t , t 0 , and η, η 0 are the density, flow time, and viscosity of the drug solutions (7H4MC + ethanol or propanol + water) and the solvents (ethanol or propanol + water), respectively.…”

Viscosities and Densities of Mixed Aqueous Alkali Metal Nitrate Solutions at T = (293.15–333.15) K

“…14 In addition, the viscosities of nitrates in other solvents have been also investigated, such as KNO 3 in aqueous 2-propanol solutions 15 and L-phenylalanine, L-leucine, L-glutamic acid, or L-proline in 2.0 mol•dm −3 aqueous NaNO 3 solutions. 16 The relative function of anion size was inspected by comparing the viscosities of NaNO 2 and NaNO 3 aqueous solutions. Reynolds ascribed the larger viscosity of NaNO 2 to hydrogen bonds, which inhibit the fluid flow's rotational motion.…”

“…They were all measured with glass viscometers, for example, a Ubbelohde viscometer, an Ostwald viscometer, and a Cannon-Fenske viscometer . In addition, the viscosities of nitrates in other solvents have been also investigated, such as KNO 3 in aqueous 2-propanol solutions and l -phenylalanine, l -leucine, l -glutamic acid, or l -proline in 2.0 mol·dm –3 aqueous NaNO 3 solutions . The relative function of anion size was inspected by comparing the viscosities of NaNO 2 and NaNO 3 aqueous solutions.…”