3 years ago

Magneto-Adaptive Surfactants Showing Anti-Curie Behavior and Tunable Surface Tension as Porogens for Mesoporous Particles with 12-Fold Symmetry

Magneto-Adaptive Surfactants Showing Anti-Curie Behavior and Tunable Surface Tension as Porogens for Mesoporous Particles with 12-Fold Symmetry
Dennis Kollofrath, Melanie Gerigk, James A. Odendal, Philipp Erler, Mikhail Fonin, Stefanie Hermann, Kay Hagedorn, Matthias Hagner, Georg Maret, Sebastian Polarz, Martin Wessig, Markus Drechsler
Gaining external control over self-organization is of vital importance for future smart materials. Surfactants are extremely valuable for the synthesis of diverse nanomaterials. Their self-assembly is dictated by microphase separation, the hydrophobic effect, and head-group repulsion. It is desirable to supplement surfactants with an added mode of long-range and directional interaction. Magnetic forces are ideal, as they are not shielded in water. We report on surfactants with heads containing tightly bound transition-metal centers. The magnetic moment of the head was varied systematically while keeping shape and charge constant. Changes in the magnetic moment of the head led to notable differences in surface tension, aggregate size, and contact angle, which could also be altered by an external magnetic field. The most astonishing result was that the use of magnetic surfactants as structure-directing agents enabled the formation of porous solids with 12-fold rotational symmetry. Magnetic soap: Head groups containing paramagnetic transition metals provided surfactants that participated in additional, nonclassical long-range interactions. Such systems enable new modes of supramolecular self-assembly and the control of key parameters of the surfactant by an external magnetic field.

Publisher URL: http://onlinelibrary.wiley.com/resolve/doi

DOI: 10.1002/anie.201612416

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