Department of Chemical Engineering, Xi'an Jiaotong University, Xi'an, Shaanxi 710049, China;
Department of Chemical Engineering, Xi'an Jiaotong University, Xi'an, Shaanxi 710049, China;
Department of Chemical Engineering, Zhengzhou University, Zhengzhou, Henan 450002, China;
ionic liquid; topological index; conductivity; structure and property;