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8246674 
Journal Article 
Ultrasonic and optical studies of binary mixtures of ethanol with diisopropyl ether, cyclohexane or n-alkanes (C6-C9) from 298.15 to 318.15 K 
Kashyap, P; Rani, M; Tiwari, DP 
2020 
Yes 
Asian Journal of Chemistry
ISSN: 0970-7077
EISSN: 0975-427X 
Asian Publication Corporation 
32 
2 
303-310 
English 
Ultrasonic speeds (u) and refractive indices (n) of the binary liquid mixtures of ethanol with diisopropyl ether (DIPE) or cyclohexane or n-alkane (C6-C9) were experimentally measured from 298.15 to 318.15 K over entire composition range. Using these measurements deviation in ultrasonic speed (∆u), deviation in refractive index (∆n), excess intermolecular free length (LEf) and excess isentropic compressibility (KEs) were calculated and fitted with Redlich-Kister equation. The ∆u values are negative for all binary mixture and magnitude of negative deviation for binary mixture of ethanol and n-alkane decreases as chain length increases. At equimolar composition, KEs follows the order: n-hexane > n-heptane > n-otcane > n-nonane > diisopropyl ether > cyclohexane. Experimental results were analyzed to understand the various molecular interactions present in the binary mixtures. The u values for all binary liquid solutions were also correlated using different empirical correlations such as Nomoto, impedence dependence relation and van Dael ideal mixing relation. The u for binary liquid mixtures were also computed theoretically using Schaaff′s collision factor theory. Free length theory was used to compute inter-molecular free length (LEf). Various correlations e.g., Arago-Biot (A-B), Gladstone-Dale (G-D), Heller (H), Lorentz-Lorentz (L-L), Eyring-John (E-J), Newton (Nw) and Weiner (W) were used for calculating refractive indices of selected systems theoretically. © 2020 Chemical Publishing Co.. All rights reserved. 
Alkanes; Diisopropyl ether; Ethanol; Refractive index; Ultrasonic speed