Application： 1,3-Didecyl-2-methylimidazolium chloride can be used: To prepare a new ionic liquid named 1,3-didecyl-2-methylimidazolium dicyanamide, which is applicable in the water/butan-1-ol separation process. To coat a graphene oxide and magnetite based nanocomposite applicable in the separation of hemin from serum samples. As a pore directing agent in the synthesis of mesoporous hectorites for drug delivery applications.