The “pre-Ouzo” structure directed synthesis of mesoporous silica nanoparticles (MSNs) in the absence of surfactant templates probably also explains the origin of highly monodisperse size distribution of classical Stöber silica NPs.

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We report a facile method for preparation of polystyrene (PS) particles with spherical, raspberry-like, and hollow flower-like structures by single-step non-surfactant self-templating polymerization of styrene in ethanol–water mixtures.