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Vol. 12, Special Issue, October 2011, pp.18-25

 

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Effect of Mo6SxI10-x Nanotubes Addition on Electrooptical Properties of Polymer-dispersed Liquid Crystals

 

1Jerneja MILAVEC, 1, 3 Aleš MRZEL, 1, 2, 3 Irena DREVENŠEK-OLENIK, 4 Mykhailo PEVNYI, 4 Victor RESHETNYAK

1 J. Stefan Institute, Jamova 39, SI 1000 Ljubljana, Slovenia

2 Faculty of Mathematics and Physics, University of Ljubljana, Jadranska 19, Ljubljana, Slovenia

3 Center of Excellence for Polymer Materials and Technologies,

Tehnološki park 24, SI 1000 Ljubljana, Slovenia

4 Physics Faculty, National Taras Shevchenko University of Kyiv,

Volodymyrs'ka street 64, Kyiv, 01601, Ukraine

Tel.: +38614773647, fax: +38614773998

E-mail: irena.drevensek@ijs.si

 

 

Received: 15 June 2011   /Accepted: 18 July 2011   /Published: 31 October 2011

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Abstract: We investigated the effect of incorporation of about 0.1 wt% Mo6S4I6 nanotubes in the (H)PDLC mixture composed of commercially available compounds. The effect of nanotube addition on optical contrast and switching voltage was analysed. The results show, that the switching voltage of the composites with nanotubes is considerably lower than the switching voltage of the analogous structures without the nanotubes. The structures with nanotubes also show less hysteresis upon increasing and decreasing the external voltage. The electron microscopy investigations reveal that the nanotube material accumulates inside the LC domains. We show that a presence of the nanotubes in the LC material causes a decrease of the threshold voltage and also improves the switching speed upon modification of an external voltage, which explains the phenomena observed in the (H)PDLC structures.

 

Keywords: Polymer-dispersed liquid crystals, Nanotubes, Electrooptic switching

 

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