Method of producing microcapsules

A method of producing a microcapsule having a diameter of 1 μm or less and comprising an envelope and a substance encapsulated in the envelope, said method comprising:

• preparing a substrate in which a plurality of material-feeding microchannels and a reaction microchannel connected to the plurality of material-feeding microchannels are formed;
• feeding a fluid containing the encapsulated substance into at least one of the plurality of material-feeding microchannels;
• feeding an envelope-forming fluid containing an envelope-forming material into at least another one of the plurality of material-feeding microchannels;
• forming a microcapsule such that the encapsulated substance is encapsulated within the envelope in the reaction microchannel by causing the envelope-forming fluid and the fluid containing the encapsulated substance that converge in the reaction microchannel from each material-feeding microchannel to flow through the reaction microchannel while continuously maintaining the interface between the fluids formed at the confluence thereof;
• and
• collecting the fluid containing the microcapsule flowing through the reaction microchannel.