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

submitted on 28.01.2020 and posted on 29.01.2020 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