Intelligently Thermoresponsive Ionic Liquid toward Molecular Firefighting and Thermal Energy Management

Abstract

Hydrocarbon-based phase change materials (PCMs) are accompanied by an inherent fire risk, which is hindering their further application especially in construction. Molecular-firefighting PCMs can be ideal and promising candidates to simultaneously ensure the highly efficient energy management and fire safety of PCMs. In this work, two novel phosphorus/nitrogen-containing ionic liquids ([DP][MI] and [DP][TEA]), composed of imidazole (MI) or triethylamine (TEA) cations and dicetyl phosphate (DP) anion, were synthesized for fire-proofing thermal energy management. The fire risk assessment confirmed that the extinguishing time of prepared [DP][MI] and [DP][TEA] was greatly shortened to 20 s and 3.5 min from 45 min for controlled sample, respectively. Moreover, the thermal enthalpy of [DP][MI] reached about 99.0 J g −1 . In addition, [DP][MI] and [DP][TEA] achieved low supercooling extents of 2.2 and 4.4 °C, separately. Both molecular firefighting and efficient energy management were achieved for [DP][MI] and [DP][TEA]. As applied in wood-plastic composite which is ubiquitous in construction, [DP][TEA] endowed the composite with temperature-regulating capability of about 10 °C in hut test and remarkably suppressed fire hazard of the composite, displaying a potential application value.

Phase Change Materials for Renewable Energy Storage at Intermediate Temperatures

“…However, their solid analogues, organic salts, were recently recognized as potential PCMs. , These materials are particularly attractive for PCM applications as their melting points depend on the nature of the cation and anion and are thus, to some extent, tunable. They also commonly allow high volumetric energy storage, many (particularly the aprotic types) are quite chemically and thermally stable, nonflammable, and nonvolatile. , However, as for all organic materials, organic salts have inherently low thermal conductivities. This could potentially be increased using additives such as nanoparticles, and this avenue has been explored for ionic liquids in the context of their use as heat transfer fluids, but there is little research on this approach for their solid state analogues.…”

“…They also commonly allow high volumetric energy storage, many (particularly the aprotic types) are quite chemically and thermally stable, nonflammable, and nonvolatile. 136,139 However, as for all organic materials, organic salts have inherently low thermal conductivities. This could potentially be increased using additives such as nanoparticles, and this avenue has been explored for ionic liquids in the context of their use as heat transfer fluids, 140 but there is little research on this approach for their solid state analogues.…”

Ionic liquid functionalized Fe3O4 core–shell nanoparticles: A magnetically separable Brønsted acid catalyst for the synthesis of polythioamides

“…[40,41] IL can be used in many applications such as electrochemical bio-sensing, bio-diesel preparation, thermal energy management, and formation of carbonate from CO 2 . [42][43][44][45] Because of consistency and insupportable viscosity, it is very difficult to remove and reuse IL, which limits its applications. To overcome this limitation, it is necessary to modify IL, so that it can be easily reused and removed from the reaction mixture.…”