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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Sarua, Andrei
University of Bristol
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (11/11 displayed)
- 2018Impact of Sb and Na Doping on the Surface Electronic Landscape of Cu 2 ZnSnS 4 Thin Filmscitations
- 2018Impact of Sb and Na Doping on the Surface Electronic Landscape of Cu2ZnSnS4 Thin Filmscitations
- 2017Single molecular precursor solution for CuIn(S,Se)2 thin films photovoltaic cells:structure and device characteristicscitations
- 2017Single molecular precursor solution for CuIn(S,Se)2 thin films photovoltaic cellscitations
- 2017Top-down design of magnonic crystals from bottom-up magnetic nanoparticles through protein arrayscitations
- 2017Single Molecular Precursor Solution for CuIn(S,Se)2 Thin Films Photovoltaic Cells: Structure and Device Characteristicscitations
- 2015Integration of individual TiO2 nanotube on the chip: Nanodevice for hydrogen sensingcitations
- 2015Integration of individual TiO2 nanotube on the chipcitations
- 2013The influence of suspended nano-particles on the frederiks threshold of the nematic host
- 2013The influence of suspended nanoparticles on the Frederiks threshold of the nematic hostcitations
- 2007Integrated Raman - IR Thermography for Reliability and Performance Optimization, and Failure Analysis of Electronic Devices
Places of action
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booksection
The influence of suspended nano-particles on the frederiks threshold of the nematic host
Abstract
In recent years several papers reported an enhanced dielectric anisotropy when ferroelectric particles were suspended in a liquid crystal. These results seem to be sensitive to the liquid crystal used and the preparation method of the ferroelectric particles. In this paper we compare different preparation methods of suspended barium titanate in two different liquid crystal hosts. As a control experiment we have followed similar preparation steps with non- ferroelectric silica particles. In all cases we found a broadening of the optical Frederiks transition but no change in the dielectric anisotropy. Raman spectroscopy has been used to investigate the loss of tetragonal structure in the barium titanate as a function of milling time and particle size. As reported in the earlier literature barium titanate does not exhibit a well-defined tetragonal crystal structure below a certain particle size and loses its ferroelectric features. This provides a simple rationalisation for the absence of any dielectric enhancement.