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What and why of microreactors Microreactors are microfluidic devices where chemical reactions are performed in very narrow channels (typically 100–500 µm). Microreactors can be constructed from a variety of materials including metals, glass, silicon and organic polymers using microfabrication techniques (wet-, ion- and laser-etching; hot embossing and moulding methods). These devices are continuous flow reactors where reactants are mixed, or treated, in a continuous process