Fixation on Solid Substrates and Modification, (b)Pickering Emulsion Method, (c)Microfluidic Method, (d)Seeded Emulsion PolymerizationGiving Snowman- and Dumbbell-Like Nanoparticles , and (e) Self-Assembly of Copolymer Followed by Crosslinking Giving Janus Nanoparticles