title: Magneto-Adaptive Surfactants Showing Anti-Curie Behavior and Tunable Surface Tension as Porogens for Mesoporous Particles with 12-Fold Symmetry.
abstract: 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.
authors.affiliation: University of Konstanz, Universitätsstrasse 10, 78547, Konstanz, Germany.
authors.forename: Stefanie
authors.initials: S
authors.lastname: Hermann
authors.affiliation: University of Konstanz, Universitätsstrasse 10, 78547, Konstanz, Germany.
authors.forename: Martin
authors.initials: M
authors.lastname: Wessig
authors.affiliation: University of Konstanz, Universitätsstrasse 10, 78547, Konstanz, Germany.
authors.forename: Dennis
authors.initials: D
authors.lastname: Kollofrath
authors.affiliation: University of Konstanz, Universitätsstrasse 10, 78547, Konstanz, Germany.
authors.forename: Melanie
authors.initials: M
authors.lastname: Gerigk
authors.affiliation: University of Konstanz, Universitätsstrasse 10, 78547, Konstanz, Germany.
authors.forename: Kay
authors.initials: K
authors.lastname: Hagedorn
authors.affiliation: University of Konstanz, Universitätsstrasse 10, 78547, Konstanz, Germany.
authors.forename: James A
authors.initials: JA
authors.lastname: Odendal
authors.affiliation: University of Konstanz, Universitätsstrasse 10, 78547, Konstanz, Germany.
authors.forename: Matthias
authors.initials: M
authors.lastname: Hagner
authors.affiliation: Laboratory for Soft-Matter Electron Microscopy, University of Bayreuth, 95440, Bayreuth, Germany.
authors.forename: Markus
authors.initials: M
authors.lastname: Drechsler
authors.affiliation: University of Konstanz, Universitätsstrasse 10, 78547, Konstanz, Germany.
authors.forename: Philipp
authors.initials: P
authors.lastname: Erler
authors.affiliation: University of Konstanz, Universitätsstrasse 10, 78547, Konstanz, Germany.
authors.forename: Mikhail
authors.initials: M
authors.lastname: Fonin
authors.affiliation: University of Konstanz, Universitätsstrasse 10, 78547, Konstanz, Germany.
authors.forename: Georg
authors.initials: G
authors.lastname: Maret
authors.affiliation: University of Konstanz, Universitätsstrasse 10, 78547, Konstanz, Germany.
authors.forename: Sebastian
authors.identifier: 0000-0003-1651-4906
authors.initials: S
authors.lastname: Polarz
keywords: mesoporous solids; non-equilibrium structures; self-assembly; stimuli-responsive materials; surfactants