Density, Viscosity, and Excess Properties of Aqueous Solution of 1,3-Dimethyl-2-imidazolidinone (DMI)

Abstract

A complete study of thermophysical properties concerning the 1,3-dimethyl-2-imidazolidinone (DMI) + water binary system is realized. Density, speed of sound, dynamic viscosities, and refractive index measurements have been performed at atmospheric pressure, using a vibrating tube densitometer, a falling ball viscosimeter, and a refractometer for pure DMI, pure water, and for aqueous solutions of DMI, from 278.15 to 323.15 K. The thermal expansion was calculated from density data. Excess Gibbs energy of flow and the corresponding excess entropy of flow were also calculated considering dynamic viscosity and density data. Excess molar properties (volume, thermal expansion, Gibbs energy of flow, and square of refractive index) were calculated, and the Redlich−Kister equations were applied to correlate the data. The analysis of the behavior of the excess properties allows us to identify the most relevant molecular interaction in mixtures rich in DMI and in mixtures rich in water. Our results show that DMI can be classified as a liquid structure maker and that molecules of water are certainly inserted in the DMI network at finite dilution.

Thermodynamic Behavior of the (Methylcyclopentane + Ethyl Acetate) Binary Liquid Mixture: Density at Several Temperatures and Vapor–Liquid Equilibrium at 25, 50, and 101.3 kPa

“…The expanded uncertainty of the temperature ( U ( T )) measured by the device was 0.02 K ( k = 2). The density was measured with a standard uncertainty ( u (ρ)) of 0.00005 g·cm –3 , and the impurities of the chemicals were taken into account. , …”

Efficient Scavenging of TEMPOL Radical by Ascorbic Acid in Solution and Related Prolongation of 13C and 1H Nuclear Spin Relaxation Times of the Solute

“…Lovis 2000 ME/DMA 4100 (Anton Paar, Graz, Austria), a combined microviscometer and density meter, was used to measure the dynamic viscosity, η, by falling ball principle (1.5 mm steel ball in a 1.62 mm capillary made of polychlorotrifluoroethylene, PCTFE) and density, ρ, by oscillating U-tube method at 25 • C and 37 • C [74,75]. Due to the larger volume requirements of the method for ρ (1 mL), independently prepared solutions of 200 mM glycine (without 13 C labelling) as well as 200 mM glycine with 200 mM AA in D 2 O were used, neglecting the effect of the low concentration of TEMPOL in the main sample series (Table S1).…”