Thermophysical Properties of 1-Ethyl-3-methylimidazolium Dicyanamide + Water: Understanding Interactions and Structure of Ionic Liquid + Water Systems

• DOI: 10.1021/acs.jced.4c00243
• Publication Date: 2024-07-22T18:43:25Z
• Authors: Carlos A. Nieto d...; Angela Lamas; Cagenna Magendran; Rafael M. Almeida; Xavier Paredes; Ângela F. Santos; Isabel M. S. Lamp...; Fernando J. V. Sa...; Maria José V. Lou...; Teófilo A. Graber
• Keywords: Dicyanamide

Ionic liquids with the dicyanamide anion, namely, 1-alkyl-imidazolium cations have been receiving attention recently due to their potential applications. The utilization of these as heat-transfer fluids, specifically in small heat exchangers and microchannels for microprocessor cooling, is presently deemed highly feasible, it can be both more efficient environmentally acceptable. equipment design that uses fluids requires knowledge thermophysical properties. If one or fluid properties are considered inadequate, additives may introduced improve performance key aspects. Water used lower viscosity thermal conductivity, example, if working temperature range allows it. In this paper, we report most comprehensive measurements pure 1-ethyl-3-methylimidazolium dicyanamide, [C2mim][N(CN)2], its mixtures water, whole concentration range, at P = 0.1 MPa. measured were density speed sound, electrical conductivity (293.15 < T/K 343.15), 353.15), refractive index 343.15). Water-free values ionic liquid obtained, following procedures previously developed. All results obtained analyzed discussed light current molecular structure effect on macroscopic behavior. Analysis ionicity aqueous mixture MacFarland scale shows similar [C2mim][CH3SO3] but much higher than [C2mim][CH3COO]. For liquid, ΔW 0.18, 82% 0.01 M KCl, an 66%. variation composition a given was using Filaments Model, which not capable reproducing experimental points. structural behavior water found qualitatively previous simulation data other + mixtures, solidifying proposed picture binary vary. This type pave way several applications, fields transfer/storage battery electrolytes.