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Koch K, Kundt M, Barkane A, Nadasi H, Webers S, Landers J, Wende H, Eremin A, Schmidt AM. Superparamagnetic nanoparticles with LC polymer brush shell as efficient dopants for ferronematic phases. Phys Chem Chem Phys 2021; 23:24557-24569. [PMID: 34755719 DOI: 10.1039/d1cp03005a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Liquid crystal (LC) based magnetic materials consisting of LC hosts doped with functional magnetic nanoparticles enable optical switching of the mesogens at moderate magnetic field strengths and thereby open the pathway for the design of novel smart devices. A promising route for the fabrication of stable ferronematic phases is the attachment of a covalently bound LC polymer shell onto the surface of nanoparticles. With this approach, ferronematic phases based on magnetically blocked particles and the commercial LC 4-cyano-4'-pentylbiphenyl (5CB) liquid crystal were shown to have a sufficient magnetic sensitivity, but the mechanism of the magneto-nematic coupling is unidentified. To get deeper insight into the coupling modes present in these systems, we prepared ferronematic materials based on superparamagnetic particles, which respond to external fields with internal magnetic realignment instead of mechanical rotation. This aims at clarifying whether the hard coupling of the magnetization to the particle's orientation (magnetic blocking) is a necessary component of the magnetization-nematic director coupling mechanism. We herein report the fabrication of a ferronematic phase consisting of surface-functionalized superparamagnetic Fe3O4 particles and 5CB. We characterize the phase behavior and investigate the magneto-optical properties of the new ferronematic phase and compare it to the ferronematic system containing magnetically blocked CoFe2O4 particles to get information about the origin of the magneto-nematic coupling.
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Affiliation(s)
- Karin Koch
- Universität zu Köln, Department Chemie, Institut für Physikalische Chemie, Luxemburger Str. 116, D-50939 Köln, Germany.
| | - Matthias Kundt
- Universität zu Köln, Department Chemie, Institut für Physikalische Chemie, Luxemburger Str. 116, D-50939 Köln, Germany.
| | - Anda Barkane
- Universität zu Köln, Department Chemie, Institut für Physikalische Chemie, Luxemburger Str. 116, D-50939 Köln, Germany.
| | - Hajnalka Nadasi
- Otto-von-Guericke-Universität Magdeburg, Institut für Physik, Universitätsplatz 2, D-39016 Magdeburg, Germany
| | - Samira Webers
- Faculty of Physics and Center for Nanointegration Duisburg-Essen (CENIDE), Universität Duisburg-Essen, Duisburg, Germany
| | - Joachim Landers
- Faculty of Physics and Center for Nanointegration Duisburg-Essen (CENIDE), Universität Duisburg-Essen, Duisburg, Germany
| | - Heiko Wende
- Faculty of Physics and Center for Nanointegration Duisburg-Essen (CENIDE), Universität Duisburg-Essen, Duisburg, Germany
| | - Alexey Eremin
- Otto-von-Guericke-Universität Magdeburg, Institut für Physik, Universitätsplatz 2, D-39016 Magdeburg, Germany
| | - Annette M Schmidt
- Universität zu Köln, Department Chemie, Institut für Physikalische Chemie, Luxemburger Str. 116, D-50939 Köln, Germany.
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Koch K, Kundt M, Eremin A, Nadasi H, Schmidt AM. Efficient ferronematic coupling with polymer-brush particles. Phys Chem Chem Phys 2020; 22:2087-2097. [DOI: 10.1039/c9cp06245a] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Switching of liquid crystal phases is of enormous technological importance and enables digital displays, thermometers and sensors.
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Affiliation(s)
- Karin Koch
- Universität zu Köln
- Department Chemie
- Institut für Physikalische Chemie
- D-50939 Köln
- Germany
| | - Matthias Kundt
- Universität zu Köln
- Department Chemie
- Institut für Physikalische Chemie
- D-50939 Köln
- Germany
| | - Alexey Eremin
- Otto-von-Guericke-Universität Magdeburg
- Institut für Physik
- D-39016 Magdeburg
- Germany
| | - Hajnalka Nadasi
- Otto-von-Guericke-Universität Magdeburg
- Institut für Physik
- D-39016 Magdeburg
- Germany
| | - Annette M. Schmidt
- Universität zu Köln
- Department Chemie
- Institut für Physikalische Chemie
- D-50939 Köln
- Germany
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Orlova T, Plamont R, Depauw A, Katsonis N. Dynamic Spirals of Nanoparticles in Light-Responsive Polygonal Fields. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2019; 15:e1902419. [PMID: 31389175 DOI: 10.1002/smll.201902419] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/12/2019] [Revised: 07/24/2019] [Indexed: 06/10/2023]
Abstract
Nanoparticles tend to aggregate once integrated into soft matter and consequently, self-assembling nanoparticles into large-scale, regular, well-defined, and ultimately chiral patterns remains an ongoing challenge toward the design and realization of organized superstructures of nanoparticles. The patterns of nanoparticles that are reported in liquid crystals so far are all static, and this lack of responsiveness extends to assemblies of nanoparticles formed in topological singularities and other localized structures of anisotropic matter. Here, it is shown that gold nanoparticles form spiral superstructures in polygonal fields of cholesteric liquid crystals. Moreover, when the cholesteric liquid crystals incorporate molecular photoswitches in their composition, the pitch of the nanoparticulate spirals follows the light-induced reorganization of the cholesteric liquid crystals. These experimental findings indicate that chiral liquid crystals can be used as chiral and dynamic templates for soft photonic nanomaterials. Controlling the geometry of these spirals of nanoparticles will ultimately allow modulating the plasmonic signature of hybrid and chiral systems.
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Affiliation(s)
- Tetiana Orlova
- Bio-inspired and Smart Materials, MESA+ Institute for Nanotechnology, University of Twente, 7500 AE, Enschede, The Netherlands
| | - Rémi Plamont
- Bio-inspired and Smart Materials, MESA+ Institute for Nanotechnology, University of Twente, 7500 AE, Enschede, The Netherlands
| | - Alexis Depauw
- Bio-inspired and Smart Materials, MESA+ Institute for Nanotechnology, University of Twente, 7500 AE, Enschede, The Netherlands
| | - Nathalie Katsonis
- Bio-inspired and Smart Materials, MESA+ Institute for Nanotechnology, University of Twente, 7500 AE, Enschede, The Netherlands
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Eimura H, Umeta Y, Tokoro H, Yoshio M, Ohkoshi SI, Kato T. Self-Assembled Fibers Containing Stable Organic Radical Moieties: Alignment and Magnetic Properties in Liquid Crystals. Chemistry 2016; 22:8872-8. [DOI: 10.1002/chem.201505213] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/30/2016] [Indexed: 12/21/2022]
Affiliation(s)
- Hiroki Eimura
- Department of Chemistry and Biotechnology; School of Engineering; The University of Tokyo, Hongo; Bunkyo-ku Tokyo 113-8656 Japan
| | - Yoshikazu Umeta
- Department of Chemistry; Graduate School of Science; The University of Tokyo; Hongo, Bunkyo-ku Tokyo 113-0033 Japan
| | - Hiroko Tokoro
- Department of Chemistry; Graduate School of Science; The University of Tokyo; Hongo, Bunkyo-ku Tokyo 113-0033 Japan
- Division of Materials Science Faculty of Pure and Applied Sciences; University of Tsukuba; 1-1-1 Tennodai Tsukuba 305-8577 Japan
| | - Masafumi Yoshio
- Department of Chemistry and Biotechnology; School of Engineering; The University of Tokyo, Hongo; Bunkyo-ku Tokyo 113-8656 Japan
| | - Shin-ichi Ohkoshi
- Department of Chemistry; Graduate School of Science; The University of Tokyo; Hongo, Bunkyo-ku Tokyo 113-0033 Japan
| | - Takashi Kato
- Department of Chemistry and Biotechnology; School of Engineering; The University of Tokyo, Hongo; Bunkyo-ku Tokyo 113-8656 Japan
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Riou O, Lonetti B, Tan RP, Harmel J, Soulantica K, Davidson P, Mingotaud AF, Respaud M, Chaudret B, Mauzac M. Room-Temperature, Strain-Tunable Orientation of Magnetization in a Hybrid Ferromagnetic Co Nanorod-Liquid Crystalline Elastomer Nanocomposite. Angew Chem Int Ed Engl 2015. [PMID: 26218322 DOI: 10.1002/anie.201504320] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
Hybrid nanocomposites based on magnetic nanoparticles dispersed in liquid crystalline elastomers are fascinating emerging materials. Their expected strong magneto-elastic coupling may open new applications as actuators, magnetic switches, and for reversible storage of magnetic information. We report here the synthesis of a novel hybrid ferromagnetic liquid crystalline elastomer. In this material, highly anisotropic Co nanorods are aligned through a cross-linking process performed in the presence of an external magnetic field. We obtain a highly anisotropic magnetic material which exhibits remarkable magneto-elastic coupling. The nanorod alignment can be switched at will at room temperature by weak mechanical stress, leading to a change of more than 50 % of the remnant magnetization ratio and of the coercive field.
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Affiliation(s)
- Ophélie Riou
- Laboratoire des Interactions Moleculaires et Reactivité Chimique et Photochimique, Université de Toulouse, CNRS UMR 5623, 118 route de Narbonne, 31062 Toulouse Cedex 9 (France)
| | - Barbara Lonetti
- Laboratoire des Interactions Moleculaires et Reactivité Chimique et Photochimique, Université de Toulouse, CNRS UMR 5623, 118 route de Narbonne, 31062 Toulouse Cedex 9 (France).
| | - Reasmey P Tan
- Laboratoire de Physique et Chimie de Nano-Objets, Université de Toulouse, INSA, UPS, LPCNO, CNRS, 135 avenue de Rangueil, 31077 Toulouse Cedex 9 (France)
| | - Justine Harmel
- Laboratoire de Physique et Chimie de Nano-Objets, Université de Toulouse, INSA, UPS, LPCNO, CNRS, 135 avenue de Rangueil, 31077 Toulouse Cedex 9 (France)
| | - Katerina Soulantica
- Laboratoire de Physique et Chimie de Nano-Objets, Université de Toulouse, INSA, UPS, LPCNO, CNRS, 135 avenue de Rangueil, 31077 Toulouse Cedex 9 (France)
| | - Patrick Davidson
- Laboratoire de Physique des Solides, UMR 8502, Université Paris-Sud, Batiment 510, 91405 Orsay Cedex (France)
| | - Anne-Françoise Mingotaud
- Laboratoire des Interactions Moleculaires et Reactivité Chimique et Photochimique, Université de Toulouse, CNRS UMR 5623, 118 route de Narbonne, 31062 Toulouse Cedex 9 (France)
| | - Marc Respaud
- Laboratoire de Physique et Chimie de Nano-Objets, Université de Toulouse, INSA, UPS, LPCNO, CNRS, 135 avenue de Rangueil, 31077 Toulouse Cedex 9 (France)
| | - Bruno Chaudret
- Laboratoire de Physique et Chimie de Nano-Objets, Université de Toulouse, INSA, UPS, LPCNO, CNRS, 135 avenue de Rangueil, 31077 Toulouse Cedex 9 (France)
| | - Monique Mauzac
- Laboratoire des Interactions Moleculaires et Reactivité Chimique et Photochimique, Université de Toulouse, CNRS UMR 5623, 118 route de Narbonne, 31062 Toulouse Cedex 9 (France)
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Riou O, Lonetti B, Tan RP, Harmel J, Soulantica K, Davidson P, Mingotaud AF, Respaud M, Chaudret B, Mauzac M. Room-Temperature, Strain-Tunable Orientation of Magnetization in a Hybrid Ferromagnetic Co Nanorod-Liquid Crystalline Elastomer Nanocomposite. Angew Chem Int Ed Engl 2015. [DOI: 10.1002/ange.201504320] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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