Ultralow Thermal Resistance across Solid-Ionic Liquid Interface Caused by the Charge-Induced Ordered Ionic Layer

The understanding and regulation of thermal transport across the solid-liquid interface, especially the electrical double layer (EDL) formed by ionic liquid (IL), is significant for the reasonable design of the efficient thermal dissipation capabilities in the field of chemical engineering. In the present work, by large-scale molecular dynamics simulation method, we reveal that rather than the strong solid-liquid interaction, the atomic structure of EDL dominates the entire interfacial thermal transport across solid-IL interfaces. The simulation results show that as the surface charge increases, interfacial thermal resistance (ITR) will decrease in two stages, sharp firstly and then slowly. Two-dimensional structure factors, geometry state of cation, and solid-liquid interfacial energy for different surface charge demonstrate that the evaluation of EDL agrees well with the trend of ITR. Furthermore, the vibrational spectrum and frequency-dependent heat flow also indicate that the high ordered EDL will enh...