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Representation of the spiral microreactor. (A) and (a) interphase between the aqueous CTAB solution and ethanolic TEOS solution where the TEOS hydrolysis occurs. (B) and (b) a shell layer derived from the condensation of hydrolyzed TEOS is formed after complete mixing and it is stabilized by CTAB micelles. (C) and (c) further condensation over the shell layer originates the HSSs collected at the outlet. Reproduced from Ref. [40] under CC BY 4.0, Copyright The Authors, 2017.
