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Elastic deformations in semi-dilute Ni nanorod/hydrogel composites

  • Christoph Schopphoven
  • Kerstin Birster
  • Rouven Schweitzer
  • Christian Lux
  • Shilin Huang
  • Markus Kästner
  • Günter Auernhammer
  • Andreas Tschöpe
Original
  • 56 Downloads

Abstract

Magnetic nanocomposites were prepared by dispersing uniaxial ferromagnetic Ni nanorods in poly(acrylamide) hydrogels. Field alignment of the nanorods during polymerization resulted in a magnetic texture which was explored for field-induced deformations in the elastic composite. At very low particle volume fraction \(<10^{-6}\), the magnetic torque resulted in a local rotation of the nanorods, measured by optical transmission of linearly polarized light, with a field- and orientation dependence in agreement with the Stoner–Wohlfarth model. The local rotation was virtually unaffected by an increase in the volume fraction to \(\sim 10^{-4}\) which suggested negligible interparticle interactions or mutual compensation of opposing contributions. Elastic interactions, mediated by the deformation of the matrix, were investigated by FEM simulations for nanorods of different aspect ratio and relative spatial positions. Complementary experiments were performed by measuring the rotation of individual nanorods using laser scanning confocal microscopy. The results suggest interparticle interactions to be negligible in textured nanorod composites up to a volume fraction of \(10^{-4}\). Macroscopic deformations of Ni nanorod/hydrogel magnetic actuators in this concentration regime are expected to be solely determined by the intrinsic properties of the nanorods which was demonstrated using the example of a torsion cylinder.

Keywords

Nanorods Hydrogel Magnetic actuator Interparticle interaction Torsion cylinder 

Notes

Acknowledgements

We thank C. Wagner (Saarland University, Physics Department) for providing access to the shear rheometry equipment and M. Hermes and A. Schmidt (University of Cologne, Chemistry Department) for assistance with nanoparticle functionalization. We gratefully acknowledge financial support by the German National Science Foundation DFG in the priority program SPP1681 Grants TS62/4-2, AU321/3-2 and KA3309/2-2.

Supplementary material

419_2018_1461_MOESM1_ESM.pdf (339 kb)
Supplementary material 1 (pdf 338 KB)

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  • Christoph Schopphoven
    • 1
  • Kerstin Birster
    • 1
  • Rouven Schweitzer
    • 1
  • Christian Lux
    • 2
  • Shilin Huang
    • 3
    • 4
  • Markus Kästner
    • 2
  • Günter Auernhammer
    • 3
    • 5
  • Andreas Tschöpe
    • 1
  1. 1.Physics DepartmentSaarland UniversitySaarbrückenGermany
  2. 2.Institute of Solid MechanicsTechnische Universität DresdenDresdenGermany
  3. 3.Max Planck Institute for Polymer ResearchMainzGermany
  4. 4.School of Materials Science and EngineeringSun Yat-sen UniversityGuangzhouChina
  5. 5.Institute of Physical Chemistry and Polymer Physics, Department of Polymer InterfacesLeibniz Institute of Polymer ResearchDresdenGermany

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