TECHNOLOGY FOCUS - CHEMICAL ENGINEERING - Preferred Devices: The segmentation fluid source consists of valve (5A) and pump (5B). The nanocrystal precursor mixer is in fluid communication with nanocrystal precursor sources (2A,2B), and configured to mix the solutions (p1,p2). The nanocrystal precursor sources (2A,2B) consist of precursor pumps (m1,m2). The system further consists of growth chamber (7) for growing nanocrystals in fluid communication with the microwave reactor. The energy source is microwave.    TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Composition: The nanocrystal precursor solution comprises nickel, copper, indium, sulfur, gallium, selenium, lead, tin, zinc, phosphorus, cadmium, tellurium, germanium, silicon, mercury, oxygen, silver, bismuth, sodium and/or antimony. The nanocrystal precursor source comprises nanocrystal precursor sources (2A,2B). The nanocrystal precursor solution comprises nanocrystal precursor solution (p1,p2). The segmentation fluid comprises gas and/or liquid, where bubble or droplet flow occurs. The nanocrystal comprises copper-indium-selenide, lead selenide, copper-indium-sulfide, copper zinc tin sulfide (Cu2ZnSnS4) and/or metal-organic frame work (CPO-27-Ni). The gas is inert, and is argon. Preferred Process: Provision of nanocrystal precursor solution involves mixing. Irradiation process is carried out for microwave zone residence time of 0.1-100 seconds, preferably 0.1-10 seconds and 25-250 degrees C, preferably 50-200 degrees C. Synthesis process involves growing nanocrystals in growth zone for 5-30 minutes, preferably 20 minutes. Synthesis process involves growing shells of nanocrystals to provide nanoparticle having nanocrystal core and shell. Production process further involves providing gas into the continuous flow path before the flow path enters the energy source in order to cause partitions of gas within the tube positioned between segments of the mixture of precursors thereby allowing the mixture of precursors within segment to mix as it travels within the tube down the flow path.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Composition: The nanocrystal precursor solution comprises oleylamine, trioctylphosphine, trioctylphosphine oxide, hexadecylamine, water, triethylene glycol, ethylene glycol, oleic acid, dodecanethiol, dioctyl ether, 1-octadecene, glycerol and/or 1,3-propanediol-1,4-butanediol.