Ultrasonic Absorption in Mixtures of 1,2-Ethanediol with 1-Nonanol at T = 298.15 K

Abstract

Ultrasonic absorption coefficients for (1,2-ethanediol + 1-nonanol) have been measured for various mole fractions between 0 and 1 at 298.15 K. The measurements of the absorption coefficients have been performed by the standard pulse technique in the frequency range of (30 to 80) MHz. The volume viscosity is derived from the measured quantities. The dependence upon the mixture composition is discussed.

A Comparative Ultrasonic Relaxation Study of Lower Vicinal and Terminal Alkanediols at 298.15 K in Relation to Their Molecular Structure and Hydrogen Bonding

“…A good example is 1,2-ethanediol. As has been reported recently, for this diol in closed conditions (at room temperature), ultrasound absorption values from (120 to 386) × 10 –15 m –1 ·s 2 are reported. This prompted us to investigate the ultrasound absorption in the megahertz range for lower alkanediols, which are liquids that are capable of forming both inter- and intramolecular hydrogen bonds.…”

“…This finding is consistent with reports in the literature, as a survey of the literature shows that the ratio of η v /η s scatters around 1 for different pure alcohols. 2,27,38−41 Additionally, for solutions of KCl and NaBr in glycerol, 41 as well as for binary mixtures of alcohols, 2,39 such scattering of η v /η s has been reported. According to Brai and Kaatze, 38 differences in the η v /η s ratio (from 1.28 to 0.36) are reported for the lower alkanols, which may be related to a structural relaxation process in the gigahertz range.…”

“…This finding is in accordance with previous reports. 2 However, as mentioned in the Introduction, the values reported by various authors often show considerable differences, and these differences are difficult to understand. 2 In the case of the remaining alkanediols, the lack of data makes it impossible to make a direct comparison.…”

“…2 However, as mentioned in the Introduction, the values reported by various authors often show considerable differences, and these differences are difficult to understand. 2 In the case of the remaining alkanediols, the lack of data makes it impossible to make a direct comparison. However, comparison with the limited data reported by Litovitz et al 20 shows that our αf 2 values are generally at least qualitatively consistent with those reported.…”

“…However, measurements of ultrasound absorption are rather rare (a concise review can be found in ref ), especially in comparison with measurements of speed of sound. As stated previously, three reasons for this seem dominant: (i) an essentially poorer uncertainty than with the measurement uncertainty of the speed of sound, (ii) more complicated measurements (apparatus and procedure), and (iii) practically, there is a lack of commercially available equipment available at a moderate price. It also appears that the publications are scattered across a variety of sources that are difficult to acquire.…”