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Birster K, Schweitzer R, Schopphoven C, Tschöpe A. Magnetic torque-driven deformation of Ni-nanorod/hydrogel nanocomposites. PHYSICAL SCIENCES REVIEWS 2020. [DOI: 10.1515/psr-2019-0089] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Abstract
Nickel (Ni) nanorods were prepared by the anodized aluminum oxide (AAO) template method and dispersed in poly(acrylamide) (PAM) hydrogels. The deformation of the magnetoresponsive composites was studied with particular attention to the consequences of finite magnetic shape anisotropy as compared to rigid dipoles on the field-dependent torque. For comparison with experiments, the composite was described as an elastic continuum with a local magnetic torque density, applied by discrete particles and determined by the local orientation of their magnetic anisotropy axis with respect to the magnetic field. The mean magnetic moment of the single domain particles m and their volume density in the composite φ
vol were derived from the static field-dependent optical transmission (SFOT) of linear polarized light. The mechanical coupling between the particles and their viscoelastic environment was retrieved from the rotational dynamics of the nanorods using oscillating field-dependent optical transmission (OFOT) measurements. Field- and orientation-dependent magnetization measurements were analyzed using the Stoner–Wohlfarth (SW) model and a valid parameter range was identified by introducing an effective anisotropy constant K
A
as a new empirical model parameter. This adapted SW-model for quantitative description of the field- and orientation dependence of the magnetic torque was validated by measuring the local rotation of nanorods in a soft elastic hydrogel. Finally, torsional and bending deformation of thin magnetically textured composite filaments were computed and compared with experiments.
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Affiliation(s)
- Kerstin Birster
- Experimentalphysik , Universität des Saarlandes , Campus D2 2 , D-66123 Saarbrücken , Germany
| | - Rouven Schweitzer
- Experimentalphysik , Universität des Saarlandes , Campus D2 2 , D-66123 Saarbrücken , Germany
| | - Christoph Schopphoven
- Experimentalphysik , Universität des Saarlandes , Campus D2 2 , D-66123 Saarbrücken , Germany
| | - Andreas Tschöpe
- Experimentalphysik , Universität des Saarlandes , Campus D2 2 , D-66123 Saarbrücken , Germany
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Witt MU, Hinrichs S, Möller N, Backes S, Fischer B, von Klitzing R. Distribution of CoFe2O4 Nanoparticles Inside PNIPAM-Based Microgels of Different Cross-linker Distributions. J Phys Chem B 2019; 123:2405-2413. [DOI: 10.1021/acs.jpcb.8b09236] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Marcus U. Witt
- Department of Physics, Soft Matter at Interfaces, Technical University Darmstadt, Alarich-Weiss-Straße 10, 64287 Darmstadt, Germany
| | - Stephan Hinrichs
- Institute of Physical Chemistry, University Hamburg, Grindelallee 117, 20146 Hamburg, Germany
| | - Nadir Möller
- Department of Physics, Soft Matter at Interfaces, Technical University Darmstadt, Alarich-Weiss-Straße 10, 64287 Darmstadt, Germany
| | - Sebastian Backes
- Stranski-Laboratories of Physical and Theoretical Chemistry, Technical University Berlin, Straße des 17. Juni 124, 10623 Berlin, Germany
| | - Birgit Fischer
- Institute of Physical Chemistry, University Hamburg, Grindelallee 117, 20146 Hamburg, Germany
| | - Regine von Klitzing
- Department of Physics, Soft Matter at Interfaces, Technical University Darmstadt, Alarich-Weiss-Straße 10, 64287 Darmstadt, Germany
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Xia S, Metwalli E, Opel M, Staniec PA, Herzig EM, Müller-Buschbaum P. Printed Thin Magnetic Films Based on Diblock Copolymer and Magnetic Nanoparticles. ACS APPLIED MATERIALS & INTERFACES 2018; 10:2982-2991. [PMID: 29272101 DOI: 10.1021/acsami.7b16971] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Printing techniques have been well established for large-scale production and have developed to be effective in controlling the morphology and thickness of the film. In this work, printing is employed to fabricate magnetic thin films composed of polystyrene coated maghemite nanoparticles (γ-Fe2O3 NPs) and polystyrene-block-poly(methyl methacrylate) (PS-b-PMMA) diblock copolymer. By applying an external magnetic field during the print coating step, oriented structures with a high content of nanoscale magnetic particles are created. The morphology of the magnetic films and the arrangement of NPs within the polymer matrix are characterized with real and reciprocal space techniques. Due to the applied magnetic field, the magnetic NPs self-assemble into microscale sized wires with controlled widths and separation distances, endowing hybrid films with a characteristic magnetic anisotropy. At the nanoscale level, due to the PS coating, the NPs disperse as single particles at low NP concentrations. The NPs self-assemble into nanosized clusters inside the PS domains when the NP concentration increases. Due to a high loading of uniformly dispersed magnetic NPs across the whole printed film, a strong sensitivity to an external magnetic field is achieved. The enhanced superparamagnetic property of the printed films renders them promising candidate materials for future magnetic sensor applications.
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Affiliation(s)
- Senlin Xia
- Technische Universität München , Physik-Department, Lehrstuhl für Funktionelle Materialien, James-Franck-Straße 1, 85747 Garching, Germany
| | - Ezzeldin Metwalli
- Technische Universität München , Physik-Department, Lehrstuhl für Funktionelle Materialien, James-Franck-Straße 1, 85747 Garching, Germany
| | - Matthias Opel
- Walther-Meissner-Institut , Bayerische Akademie der Wissenschaften, Walther-Meissner-Str. 8, 85747 Garching, Germany
| | - Paul A Staniec
- Diamond Light Source Ltd. , Diamond House, Harwell Science and Innovation Campus, Didcot, Oxfordshire OX110DE, Great Britain
| | - Eva M Herzig
- Universität Bayreuth , Physikalisches Institut, Herzig Group - Dynamik und Strukturbildung, Universitätsstr. 30, 95447 Bayreuth, Germany
| | - Peter Müller-Buschbaum
- Technische Universität München , Physik-Department, Lehrstuhl für Funktionelle Materialien, James-Franck-Straße 1, 85747 Garching, Germany
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Backes S, Witt MU, Roeben E, Kuhrts L, Aleed S, Schmidt AM, von Klitzing R. Loading of PNIPAM Based Microgels with CoFe2O4 Nanoparticles and Their Magnetic Response in Bulk and at Surfaces. J Phys Chem B 2015; 119:12129-37. [DOI: 10.1021/acs.jpcb.5b03778] [Citation(s) in RCA: 46] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Sebastian Backes
- Stranski-Laboratorium
für Physikalische und Theoretische Chemie, Technische Universität Berlin, Straße des 17. Juni 124, 10623 Berlin, Germany
| | - Marcus U. Witt
- Stranski-Laboratorium
für Physikalische und Theoretische Chemie, Technische Universität Berlin, Straße des 17. Juni 124, 10623 Berlin, Germany
| | - Eric Roeben
- Department
für Chemie, Institut für Physikalische Chemie, Universität zu Köln, Luxemburger Str. 116, 50939 Köln, Germany
| | - Lucas Kuhrts
- Stranski-Laboratorium
für Physikalische und Theoretische Chemie, Technische Universität Berlin, Straße des 17. Juni 124, 10623 Berlin, Germany
| | - Sarah Aleed
- Stranski-Laboratorium
für Physikalische und Theoretische Chemie, Technische Universität Berlin, Straße des 17. Juni 124, 10623 Berlin, Germany
| | - Annette M. Schmidt
- Department
für Chemie, Institut für Physikalische Chemie, Universität zu Köln, Luxemburger Str. 116, 50939 Köln, Germany
| | - Regine von Klitzing
- Stranski-Laboratorium
für Physikalische und Theoretische Chemie, Technische Universität Berlin, Straße des 17. Juni 124, 10623 Berlin, Germany
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Nanocomposites composed of HEUR polymer and magnetite iron oxide nanoparticles: Structure and magnetic response of the hydrogel and dried state. POLYMER 2015. [DOI: 10.1016/j.polymer.2015.01.039] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
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Bernstorff S, Holý V, Endres J, Valeš V, Sobota J, Siketić Z, Bogdanović-Radović I, Buljan M, Dražić G. Co nanocrystals in amorphous multilayers – a structure study. J Appl Crystallogr 2013. [DOI: 10.1107/s0021889813026836] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022] Open
Abstract
The structure of magnetron-sputtered Co/SiO2multilayers has been investigated using grazing-incidence small-angle X-ray scattering, X-ray diffraction, transmission electron microscopy and ion scattering techniques. A theoretical description of diffuse X-ray scattering from three-dimensional self-assembled ensembles of nanoparticles is also presented. The data revealed that Co-rich nanoparticles self-organize in a three-dimensional lattice and a dependence of the lattice parameters as well as the mean particle size on the nominal layer thickness was observed. Originally amorphous Co-rich layers crystallize readily during deposition, creating both pure Co and Co oxide particles. The results presented are important for controlled production and reliable characterization of metallic nanoparticles in solid amorphous matrices, aiming to obtain a well ordered monodisperse ensemble of nanoparticles.
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Haberl JM, Sánchez-Ferrer A, Mihut AM, Dietsch H, Hirt AM, Mezzenga R. Strain-induced macroscopic magnetic anisotropy from smectic liquid-crystalline elastomer-maghemite nanoparticle hybrid nanocomposites. NANOSCALE 2013; 5:5539-5548. [PMID: 23677459 DOI: 10.1039/c3nr01016c] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
We combine tensile strength analysis and X-ray scattering experiments to establish a detailed understanding of the microstructural coupling between liquid-crystalline elastomer (LCE) networks and embedded magnetic core-shell ellipsoidal nanoparticles (NPs). We study the structural and magnetic re-organization at different deformations and NP loadings, and the associated shape and magnetic memory features. In the quantitative analysis of a stretching process, the effect of the incorporated NPs on the smectic LCE is found to be prominent during the reorientation of the smectic domains and the softening of the nanocomposite. Under deformation, the soft response of the nanocomposite material allows the organization of the nanoparticles to yield a permanent macroscopically anisotropic magnetic material. Independent of the particle loading, the shape-memory properties and the smectic phase of the LCEs are preserved. Detailed studies on the magnetic properties demonstrate that the collective ensemble of individual particles is responsible for the macroscopic magnetic features of the nanocomposite.
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Affiliation(s)
- Johannes M Haberl
- ETH Zürich, Department of Health Science and Technology, 8092 Zürich, Switzerland
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Roeder L, Bender P, Tschöpe A, Birringer R, Schmidt AM. Shear modulus determination in model hydrogels by means of elongated magnetic nanoprobes. ACTA ACUST UNITED AC 2012. [DOI: 10.1002/polb.23202] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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