Solvothermal-assisted in situ rapid growth of octadecylamine functionalized polydopamine-based permanent coating as stationary phase for open-tubular capillary electrochromatography

•A novel solvothermal-assisted coating method for CEC stationary phase was presented.•The strategy greatly improve the preparation efficiency of PDA-based CEC columns.•More stationary phases are expected to be readily prepared via the universal method.