Synergistic Chloroform–Methanol\nBinary Solvent\nMixture Is Inherently Spatially and Dynamically Heterogeneous

Nonideality in a binary solvent mixture is manifested\nthrough anomalies\nin various physical properties like viscosity, dielectric constant,\npolarity, freezing point, boiling point, and so forth. Sometimes,\nsuch anomalies become much more prominent, leading to a synergistic\nbehavior, where the physical property of the mixture is way different\nfrom its bulk counterparts. Various alcohols/chlorinated methane binary\nsolvent mixtures show such a synergistic behavior. The reason is attributed\nto the unique but diverse interactions present in the system. We speculated\nthat these diverse interactions must manifest heterogeneity in such\na binary solvent mixture. Using the improved methodology developed\nby our group, we investigate the presence of dynamic and spatial heterogeneity\nin the chloroform/methanol synergistic binary solvent mixture. To\nour delight, we found that our projection is accurate, and indeed,\nthe chloroform/methanol binary solvent mixtures are heterogeneous.\nTwo maxima for the synergistic behavior have been observed for the\nchloroform/methanol binary solvent mixture (at ∼0.45 and 0.75\nmole fractions of methanol in chloroform) in the literature, where\nthe extent of heterogeneity was also found to be the highest. The\npresent study portrays the intriguing complexity of simple binary\nsolvent mixtures, and the findings may provide valuable insights into\nsolvent engineering for diverse applications like extraction/purification\nmedia, reaction media, polymer processing, nanomaterial synthesis,\npollutant extraction, active ingredient delivery, biofuel production,\nand battery technology.