Refractive index of ionic liquids under electric field: Methyl propyl imidazole iodide and several derivatives
Zhou Ji1, Dong Shi-Kui2, He Zhi-Hong2, Zhang Yan-Hu3, †
       

Effects of applied voltage on refractive index for five types of ionic liquids: (a) C3MImI, (b) C4MImI, (c) C5MImI, (d) C3MImBr, and (e) C4MImBF4 at wavelengths of 546 nm, 1013 nm, and 1529 nm.