“…In the ten years since the first reported synthesis of nanocrystals in a microreactor10 there has been an explosion of activity in the application of flow reactors to the small‐scale (<1 g) synthesis of high quality nanoparticles. Nanocrystalline colloids of a wide range of materials have been synthesised including (but not limited to) CdSe,11–13 CdS,10, 14 InP,15 Ag,16 Au,17 Co,18 TiO 2 ,19–21 SiO 2 ,22 LaPO 4 ,23 CaCO 3 ,24 Fe x O y ,25, 26 zeolites27, 28 and BaSO 4 ,29, 30 as well as more complicated core/shell structures such as CdSe/ZnS,31 Fe 2 O 3 /SiO 2 ,32 SiO 2 /Au,33 Au/Ag/Au34 and CdSe/ZnSe/ZnS 35. In all cases, flow reactors have been shown to offer significant advantages over equivalent batch reactions, most notably in terms of increased reaction control and the ability to fine tune the final product.…”