Advance in preparations and applications of janus particles

The term "Janus particles" is used for the description of particles with different compositions or properties on the surface of both hemispheres. Owing to their anisotropic or asymmetric structure,Janus particles have been found extensive applications in many fields. However, the anisotropy or asymmetry also makes it difficult to be prepared. A number of methods have been achieved in recent years. The progress of the preparations and applications of Janus particles were reviewed in this paper.