NOVELTY - A continuous, microwave-assisted, segmented flow reactor system (1) consists of nanocrystal precursor source (2) configured to comprise nanocrystal precursor solution, microwave reactor (3) in fluid communication with the nanocrystal precursor source, and segmentation fluid source (5) arranged in fluid communication with the fluid passageway (4) at location between the nanocrystal precursor source and the microwave reactor. The segmentation fluid source is configured to provide segmentation fluid which is immiscible with the nanocrystal precursor solution.    USE - Continuous, microwave-assisted and segmented flow reactor system is used for producing nanocrystals (all claimed). Uses include but are not limited to light emitting diodes, lasers, quantum dots and solar cells.    ADVANTAGE - The reactor system enables preparation of high-quality nanocrystals, and high control of the sizes and shapes of nanocrystals.    DETAILED DESCRIPTION - A continuous, microwave-assisted, segmented flow reactor system consists of nanocrystal precursor source configured to comprise nanocrystal precursor solution, microwave reactor in fluid communication with the nanocrystal precursor source and having fluid passageway passing through the microwave reactor configured to allow the nanocrystal precursor solution to pass through, and segmentation fluid source arranged in fluid communication with the fluid passageway at location between the nanocrystal precursor source and the microwave reactor. The segmentation fluid source is configured to provide segmentation fluid which is immiscible with the nanocrystal precursor solution. INDEPENDENT CLAIMS are included for the following:    (1) synthesis of nanocrystals, which involves providing nanocrystal precursor solution, segmenting the nanocrystal precursor solution with segmentation fluid which is immiscible with the nanocrystal precursor solution to yield segmented nanocrystal precursor solution, continuously flowing the segmented nanocrystal precursor solution through microwave reactor having microwave zone, and irradiating the segmented nanocrystal precursor solution flowing through the microwave zone to provide nanocrystals;    (2) continuous flow reactor, which consists of mixer (6) for mixing precursors together into mixture and extending the mixture down fluid passageway, segmentation fluid source for inserting gas into the fluid passageway to provide segmented flow of the mixture along the fluid passageway, energy source for nucleating the mixture as the fluid passageway extends through to produce nucleates, and heating source for growing the nucleates as the fluid passageway extends through to grow growing the nucleates into nanoparticles; and    (3) production of uniformly sized nanoparticles, which involves blending precursors together to form mixture of precursors that travels down tube in continuous flow path, extending the continuous flow path through energy source which applies energy to the mixture of precursors to uniformly activate the mixture of precursors within the tube for duration time of 0.1-100 seconds thereby allowing uniform nucleation of the mixture of precursors, extending the continuous flow path through heating source for duration time at controlled temperature allowing for uniform growth around previously formed nucleates to grow nanoparticles and isolating the nanoparticles.    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic view of the continuous, microwave-assisted and segmented flow reactor system.    Reactor system (1)    Precursor sources (2,2A,2B)    Microwave reactor (3)    Fluid passageway (4)    Segmentation fluid source (5)    Valve (5A)    Pump (5B)    Mixer (6)    Growth chamber (7)