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tical conditions tunable from liquid to gas like providing high diffusion rates, improved mixing,[6] and the ability to solubilize various pounds inaccessible by solvents employed in traditional nanocrystal syntheses.[2b,c, 3, 7] The use of a supercritical solvent in a microfluidic reactor results in narrower residence time distributions, producing homogeneous reaction conditions ideal for nanocrystal synthesis.[8] Microfluidic systems allow precise control over reaction conditions and reproducibility[9] as a result of rigorous control of heat and mass transfer.[10] In addition, themicrofluidic system can be utilized for fast screening of reaction parameters with in situ reaction monitoring.[11] Figure 1 illustrates our truly continuous threestage siliconbased microfluidic system consisting of mixing, aging, and sequential injection stages operating at a pressure of 65 bar, 3 without incorporating any manual batch manipulation between synthesis steps.[2h] We have separated each stage in order to independently probe mixing and aging processes. The first two stages of the reactor were utilized for the systematic study of InP nanocrystal formation (Figure 1 a,b). The mixing reactor was maintained at a uniform temperature