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      Impact of titanium dioxide nanoparticles on purification and contamination of nematic liquid crystals

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          Abstract

          We have investigated the impact of titanium dioxide nanoparticles on the ionic contamination of liquid crystals. Nematic liquid crystals with high and low initial ionic contamination have been examined. It has been shown that titanium dioxide nanoparticles reduced the ion density of liquid crystals with high initial ionic contamination from 134.5 × 10 12 cm −3 to 63.2 × 10 12 cm −3. In the case of liquid crystals with low initial ionic contamination, the nanoparticles led to an insignificant increase of ion density from 19.8 × 10 12 cm −3 to 25.7 × 10 12 cm −3.

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          Ionic liquid crystals.

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            Polarization-independent actively tunable colour generation on imprinted plasmonic surfaces

            Structural colour arising from nanostructured metallic surfaces offers many benefits compared to conventional pigmentation based display technologies, such as increased resolution and scalability of their optical response with structure dimensions. However, once these structures are fabricated their optical characteristics remain static, limiting their potential application. Here, by using a specially designed nanostructured plasmonic surface in conjunction with high birefringence liquid crystals, we demonstrate a tunable polarization-independent reflective surface where the colour of the surface is changed as a function of applied voltage. A large range of colour tunability is achieved over previous reports by utilizing an engineered surface which allows full liquid crystal reorientation while maximizing the overlap between plasmonic fields and liquid crystal. In combination with imprinted structures of varying periods, a full range of colours spanning the entire visible spectrum is achieved, paving the way towards dynamic pixels for reflective displays.
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              Effects of carbon nanosolids on the electro-optical properties of a twisted nematic liquid-crystal host

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                Author and article information

                Contributors
                Role: Guest Editor
                Journal
                Beilstein J Nanotechnol
                Beilstein J Nanotechnol
                Beilstein Journal of Nanotechnology
                Beilstein-Institut (Trakehner Str. 7-9, 60487 Frankfurt am Main, Germany )
                2190-4286
                2017
                21 December 2017
                : 8
                : 2766-2770
                Affiliations
                [1 ]Department of Optical Physics and Modern Natural Science, ITMO University, Kronverkskiy pr. 49, Saint Petersburg 197101, Russia
                Author information
                http://orcid.org/0000-0002-6942-3736
                Article
                10.3762/bjnano.8.275
                5753047
                d45de85b-6c71-4417-8fd3-22b3cd24864f
                Copyright © 2017, Shcherbinin and Konshina; licensee Beilstein-Institut.

                This is an Open Access article under the terms of the Creative Commons Attribution License ( http://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

                The license is subject to the Beilstein Journal of Nanotechnology terms and conditions: ( http://www.beilstein-journals.org/bjnano)

                History
                : 21 July 2017
                : 8 November 2017
                Categories
                Letter
                Nanoscience
                Nanotechnology

                ionic impurities,liquid crystals,nanoparticles,titanium dioxide

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