Podoliak, Nina, Buchnev, Oleksandr, Buluy, Oleksandr, D'Alessandro, Giampaolo, Kaczmarek, Malgosia, Reznikov, Yuriy and Sluckin, Timothy J. (2011) Macroscopic optical effects in low concentration ferronematics. Soft Matter, 7 (10), 4742-4749. (doi:10.1039/C1SM05051F).
Abstract
We present a detailed experimental and theoretical study of the optical response of suspensions of ferromagnetic nanoparticles (“ferroparticles”) in nematic liquid crystals (“ferronematics”), concentrating on the magnetic field-induced Frederiks transition. Even extremely low ferroparticle concentrations (at a volume fraction between 2 × 10-5 and 2 × 10-4), induce a significant additional ferronematic linear response at low magnetic field (<100 G) and a decrease in the effective magnetic Frederiks threshold. The experimental results demonstrate that our system has weak ferronematic behavior. The proposed theory takes into account the nematic diamagnetism and assumes that the effective magnetic susceptibility, induced by the nanoparticles, no longer dominates the response. The theory is in good agreement with the experimental data for the lowest concentration suspensions and predicts the main features of the more concentrated ones. The deviations observed in these cases hint at extra effects due to particle aggregation, which we have also observed directly in photographs
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- Current Faculties > Faculty of Engineering and Physical Sciences > School of Physics and Astronomy > Quantum, Light and Matter Group
School of Physics and Astronomy > Quantum, Light and Matter Group - Current Faculties > Faculty of Engineering and Physical Sciences > Zepler Institute for Photonics and Nanoelectronics > Nanophotonics Group
Zepler Institute for Photonics and Nanoelectronics > Nanophotonics Group - Current Faculties > Faculty of Social Sciences > School of Mathematical Sciences > Applied Mathematics and Theoretical Physics
School of Mathematical Sciences > Applied Mathematics and Theoretical Physics - Faculties (pre 2018 reorg) > Faculty of Physical Sciences and Engineering (pre 2018 reorg) > Physics & Astronomy (pre 2018 reorg) > Quantum, Light & Matter Group (pre 2018 reorg)
Current Faculties > Faculty of Engineering and Physical Sciences > School of Physics and Astronomy > Physics & Astronomy (pre 2018 reorg) > Quantum, Light & Matter Group (pre 2018 reorg)
School of Physics and Astronomy > Physics & Astronomy (pre 2018 reorg) > Quantum, Light & Matter Group (pre 2018 reorg)
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