Preparation method of dumbbell-shaped Janus colloid particles

The invention discloses a preparation method of dumbbell-shaped Janus colloid particles. The method comprises the steps of stirring and dispersing a surfactant in deionized water; adding vinyl siloxane and a reaction monomer mixture containing double bonds subjected to ultrasonic treatment for 5-30 minutes into a four-neck flask under nitrogen protection, stirring uniformly, heating until the reaction temperature is 40-75 DEG C, dropwise adding an initiator aqueous solution into a system, continuously performing reaction for 5-10 hours under the reaction temperature, then stopping stirring, cooling to the room temperature to obtain a stable white emulsion, and centrifugally washing to obtain the dumbbell-shaped Janus colloid particles. The preparation method has the characteristics that the production can be easily controlled, obtained latex can be directly used, and residual monomers can be easily removed; moreover, the reaction is performed in an aqueous medium without containing any organic solvent, so that the whole reaction process is safe and non-toxic; and the preparation method is simple in operation, and can be used for realizing the mass production of mono-dispersed Janus particles.