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Yolk\u2013shell structured materials have broad applications in biomedicine, catalysis, and environmental remediation owing to their open channels and large space for guest molecules. Conventional methods to obtain yolk\u2013shell mesoporous materials rely on costly and complex hard\u2010template strategies. In this study, a mild and convenient nonsacrificial self\u2010template strategy is developed to construct yolk\u2013shell magnetic periodic mesoporous organosilica (YS\u2010mPMO) particles by using the unique swelling\u2013deswelling property of low\u2010crosslinking density resorcinol formaldehyde (RF). The obtained YS\u2010mPMO microspheres possess an amphiphilic outer shell, high surface area (393 m<jats:sup>2<\/jats:sup> g<jats:sup>\u22121<\/jats:sup>), uniform mesopores (2.58 nm), a tunable middle hollow space (50\u2013156 nm), and high superparamagnetism (34.4\u201337.1 emu g<jats:sup>\u22121<\/jats:sup>). By tuning the synthesis conditions, heterojunction structured yolk\u2013shell Fe<jats:sub>3<\/jats:sub>O<jats:sub>4<\/jats:sub>@RF@void@PMO particles with different morphologies can be produced. Owing to the amphipathy of PMO framworks, the YS\u2010mPMO particles show great emulsion stabilization ability and recyclability under a magnetic field. YS\u2010mPMO microspheres with immobilized Au nanoparticles (\u22483 nm) act as both solid emulsifier for dispersing styrene (St) in water and interface catalysts for selective conversion of St into styrene oxide with a high selectivity of 86%, and yields of over 97%.<\/jats:p>","DOI":"10.1002\/smll.201805465","type":"journal-article","created":{"date-parts":[[2019,3,8]],"date-time":"2019-03-08T14:37:58Z","timestamp":1552055878000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":55,"title":["Nonsacrificial Self\u2010Template Synthesis of Colloidal Magnetic Yolk\u2013Shell Mesoporous Organosilicas for Efficient Oil\/Water Interface Catalysis"],"prefix":"10.1002","volume":"15","author":[{"given":"Lei","family":"Yu","sequence":"first","affiliation":[{"name":"Department of Chemistry State Key Laboratory of Molecular Engineering of Polymers Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials iChEM Fudan 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