Stimuli-Responsive Particle-Based Amphiphiles as Active Colloids Prepared by Anisotropic Click Chemistry |
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Authors: | Cornelia Lanz Moritz Schlötter Nele Klinkenberg Patricia Besirske Prof Dr Sebastian Polarz |
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Institution: | 1. Department of Chemistry, University of Konstanz, Universitätsstrasse 10, 78457 Konstanz, Germany
Institute of Inorganic Chemistry, Leibniz-University Hannover, Callinstrasse 9, 30167 Hannover, Germany;2. Department of Chemistry, University of Konstanz, Universitätsstrasse 10, 78457 Konstanz, Germany |
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Abstract: | Amphiphiles alter the energy of surfaces, but the extent of this feature is typically constant. Smart systems with amphiphilicity as a function of an external, physical trigger are desirable. As a trigger, the exposure to a magnetic field, in particular, is attractive because it is not shielded in water. Amphiphiles like surfactants are well known, but the magnetic response of molecules is typically weak. Vice-versa, magnetic particles with strong response to magnetic triggers are fully established in nanoscience, but they are not amphiphilic. In this work colloids with Janus architecture and ultra-small dimensions (25 nm) have been prepared by spatial control over the thiol-yne click modification of organosilica-magnetite core–shell nanoparticles. The amphiphilic properties of these anisotropically modified particles are proven. Finally, a pronounced and reversible change in interfacial stabilization results from the application of a weak (<1 T) magnetic field. |
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Keywords: | active colloids core–shell structures Janus nanoparticles magnetite nanoparticles smart materials |
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