ZIF-8 nanocrystals are prepared through the reverse microemulsion method using CTAB as an anionic surfactant,n-butanol as a cosurfactant and n-octane as an oil phase.The effects of molar ratio of H_2O/CTAB,molar ratio of 2 Ml/Zn~(2+)and synthetic time on the morphology and size of the as-synthesized ZIF-8 crystals are systematically investigated.It is found that the prepared ZIF-8 crystal exhibits sphere-like morphology,high crystallinity,uniform-sized particles with diameter about 100 nm when the molar rat...