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Magneto‐Adaptive Surfactants Showing Anti‐Curie Behavior and Tunable Surface Tension as Porogens for Mesoporous Particles with 12‐Fold Symmetry
Author(s) -
Hermann Stefanie,
Wessig Martin,
Kollofrath Dennis,
Gerigk Melanie,
Hagedorn Kay,
Odendal James A.,
Hagner Matthias,
Drechsler Markus,
Erler Philipp,
Fonin Mikhail,
Maret Georg,
Polarz Sebastian
Publication year - 2017
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.201612416
Subject(s) - magnetic moment , chemical physics , surface tension , magnetic nanoparticles , materials science , nanotechnology , curie temperature , mesoporous material , nanoparticle , condensed matter physics , chemistry , chemical engineering , ferromagnetism , organic chemistry , thermodynamics , physics , engineering , catalysis
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.