TY - JOUR

T1 - Stimuli‐responsive particle‐based amphiphiles as active colloids prepared by anisotropic click chemistry

AU - Lanz, Cornelia Elisabeth

AU - Schlötter, Moritz

AU - Klinkenberg, Nele

AU - Besirske, Patricia

AU - Polarz, Sebastian

N1 - Funding information: The current research was funded by an ERC consolidator grant (I-SURF; project 614606). We thank J. Brunner und C. Jenewein for the synthesis of the magnetite particles. We gratefully acknowledge technical/instrumental support from the German Research Foundation (DFG) via SFB1214 Project Z1 Particle Analysis Center and the Nanolab of the University of Konstanz.

PY - 2020/3/11

Y1 - 2020/3/11

N2 - 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.

AB - 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.

KW - Janus nanoparticles

KW - active colloids

KW - core–shell structures

KW - magnetite nanoparticles

KW - smart materials

UR - http://www.scopus.com/inward/record.url?scp=85082185754&partnerID=8YFLogxK

U2 - 10.1002/anie.202001423

DO - 10.1002/anie.202001423

M3 - Article

C2 - 32157801

VL - 59

SP - 8902

EP - 8906

JO - Angewandte Chemie - International Edition

JF - Angewandte Chemie - International Edition

SN - 0044-8249

IS - 23

ER -