Design of Janus particles by Surface modification. (A) Synthesis of metallic Janus MOF particles via the desymmetrization at interfaces approach and SEM image. Reproduced with permission from Ref. [88]. Copyright 2016, Royal Society of Chemistry. (B) Formation of Janus PS microspheres with ZnO nanowires by masking and electrochemical methods and SEM image. Reproduced with permission from Ref. [89]. Copyright 2010, Royal Society of Chemistry. (C) Illustration of the synthesis of ionic liquids modified Janus particles and the anion exchange process. Reproduced with permission from Ref. [57]. Copyright 2019, American Chemical Society. (Da) Schematic showing the controlled synthetic strategy for obtaining Au/Fe3O4@C JNPs, (Db) selective modification of Au/Fe3O4@C JNPs, (Dc) electron images of (Janus Au/Fe(OH)3-PAA)@SiO2 NPs and Au/Fe3O4@C JNPs. Reproduced with permission from Ref. [90]. Copyright 2017, Wiley-VCH.