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Stimuli-Responsive Particle-Based Amphiphiles as Active Colloids Prepared by Anisotropic Click Chemistry

submitted on 28.01.2020, 14:05 and posted on 29.01.2020, 06:00 by Cornelia Lanz, Moritz Schlötter, Nele Klinkenberg, Patricia Besirske, Sebastian Polarz
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 desired 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 (25nm) 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 (<<1T) magnetic field.


ERC consolidator grant (I-SURF; project 614606)


Email Address of Submitting Author


Leibniz University Hannover



ORCID For Submitting Author


Declaration of Conflict of Interest

no conflict of interest

Version Notes

Version 28 January 2020