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

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I-SURF : Inorganic surfactants with multifunctinal heads
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Angewandte Chemie International Edition. 2017, 56(20), pp. 5475-5479. ISSN 1433-7851. eISSN 1521-3773. Available under: doi: 10.1002/anie.201612416
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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.

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ISO 690HERMANN, Stefanie, Martin WESSIG, Dennis KOLLOFRATH, Melanie GERIGK, Kay HAGEDORN, James A. ODENDAL, Matthias HAGNER, Markus DRECHSLER, Philipp ERLER, Mikhail FONIN, Georg MARET, Sebastian POLARZ, 2017. Magneto-Adaptive Surfactants Showing Anti-Curie Behavior and Tunable Surface Tension as Porogens for Mesoporous Particles with 12-Fold Symmetry. In: Angewandte Chemie International Edition. 2017, 56(20), pp. 5475-5479. ISSN 1433-7851. eISSN 1521-3773. Available under: doi: 10.1002/anie.201612416
BibTex
@article{Hermann2017-05-08Magne-39031,
  year={2017},
  doi={10.1002/anie.201612416},
  title={Magneto-Adaptive Surfactants Showing Anti-Curie Behavior and Tunable Surface Tension as Porogens for Mesoporous Particles with 12-Fold Symmetry},
  number={20},
  volume={56},
  issn={1433-7851},
  journal={Angewandte Chemie International Edition},
  pages={5475--5479},
  author={Hermann, Stefanie and Wessig, Martin and Kollofrath, Dennis and Gerigk, Melanie and Hagedorn, Kay and Odendal, James A. and Hagner, Matthias and Drechsler, Markus and Erler, Philipp and Fonin, Mikhail and Maret, Georg and Polarz, Sebastian}
}
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