Magneto‐Adaptive Surfactants Showing Anti‐Curie Behavior and Tunable Surface Tension as Porogens for Mesoporous Particles with 12‐Fold Symmetry. (12th April 2017)

• Record Type: Journal Article
• Authors: 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
• Is Part Of: Angewandte Chemie. Volume 129:Number 20(2017)
• Page Start: 5567
• Page End: 5571
• Publication Date: 2017-04-12
• Subjects: Mesoporöse Festkörper -- Nichtgleichgewichtstrukturen -- Selbstorganisation -- Stimuliresponsive Materialien -- Tenside; Chemistry -- Periodicals; 540
• DOI: 10.1002/ange.201612416
• Languages: English
• ISSNs: 0044-8249

Abstract

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.