Volume contraction occurs during the mixing of certain solvents
Volume contraction frequently occurs when certain solvents are mixed, as evidenced by negative excess molar volumes driven by strong intermolecular interactions and efficient packing.
The retrieved literature includes multiple peer-reviewed studies examining binary liquid mixtures, protic ionic liquids, and deep eutectic solvents where negative excess molar volumes (indicating volume contraction or non-ideal volumetric behavior) are directly measured and analyzed via volumetric and thermodynamic methods.
N. P. Rao, Ronald E. Verrall. Ultrasonic velocity, excess adiabatic compressibility, apparent molar volume, and apparent molar compressibility properties of binary liquid mixtures containing 2-butoxyethanol. 1987. https://doi.org/10.1139/v87-137
Reports apparent molar volumes and excess properties demonstrating non-ideal volume changes in binary liquid mixtures.
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Dhage KS, Bhoite RN, Pagar NS, Musale SP. Thermophysical and Transport Properties of Ethanolammonium Carboxylate Protic Ionic Liquids in Water and Dimethyl Sulfoxide.. 2026. https://doi.org/10.1021/acsomega.5c13309
Demonstrates negative excess molar volumes across the entire mole fraction range for protic ionic liquid mixtures, indicating volumetric contraction upon mixing.
Warmińska D, Sutkowska A, Jamrógiewicz M, Cysewski P. Dissecting Molecular Interactions in Aqueous Deep Eutectic Solvents: A Multi-Scale Study of Choline- and Acetylcholine-Based Propylene Glycol Isomers.. 2026. https://doi.org/10.1021/acs.jpcb.5c08377
Finds negative excess molar volumes in aqueous deep eutectic solvent mixtures driven by strong hydrogen-bonding and molecular packing.
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