TITLE

Electrical behavior of nematic cells oriented by polypyrrole surface treatment

AUTHOR(S)
Alexe-Ionescu, A. L.; Barbero, G.; Dascalu, C.; Scalerandi, M.
PUB. DATE
August 2009
SOURCE
Applied Physics Letters;8/10/2009, Vol. 95 Issue 6, p064101
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
We have studied the electrical response of nematic liquid crystal cells with uniform planar alignment imposed by ClO4- doped polypyrrole layers. From the measured electrical current on a resistance in series with the nematic sample when applying a triangular potential with different periods and amplitudes, the diffusion of the ions from the polypyrrole layer into the liquid crystal was evidenced. The sample is described as an insulating liquid containing a distribution of ions depending on the characteristics of the applied external field and also of the polymer layers. A simple model concerning the diffusion of the ions from the aligning doped polypyrrole film inside the liquid crystal is proposed. The agreement between experimental data and numerical results is good.
ACCESSION #
43720440

 

Related Articles

  • Numerical simulation of thermally induced phase separation in polymer-dispersed liquid crystals. Teixeira, P. I. C.; Mulder, B. M. // Journal of Chemical Physics;12/8/1996, Vol. 105 Issue 22, p10145 

    We have developed a model of polymer-dispersed liquid crystal (PDLC) formation by thermally induced phase separation. Spinodal decomposition in the thermoplastic-LC mixture is modelled by the cell dynamical systems method of Oono and Puri, suitably modified to describe a continuous temperature...

  • Phase Analysis of the Cellulose Triacetate-Nitromethane System. Shipovskaya, Anna B.; Gegel, Natalia O.; Shmakov, Sergei L.; Shchyogolev, Sergei Yu. // International Journal of Polymer Science;2012, p1 

    A comprehensive study was made on the cellulose triacetate-nitromethane system to explore its phase separation within ranges 2- 25wt.% and -5 / +80°C by means of polarization light and electron microscopy, the turbidity spectrum method, differential thermal and X-ray analyses, and rheological...

  • Liquid Crystal O/W Emulsions to Mimic Lipids and Strengthen Skin Barrier Function. In-Young Kim; Nakagawa, Sayaka; Ri, Kinka; Hashimoto, Satoru; Masaki, Hitoshi // Cosmetics & Toiletries;Jul2009, Vol. 124 Issue 7, p64 

    In the present study, the authors produced liquid crystalline (LC) o/w emulsions whose structure mimics the skin's intercellular lipids. These emulsions are shown in cosmetic formulations to strengthen skin barrier functions while maintaining stability at higher temperatures than that of the skin.

  • Liquid crystal alignment with a molecular template of imprinted polymer layer during phase separation. Hak-Rin Kim; Jong-Wook Jung; You-Jin Lee; Jae-Hoon Kim // Applied Physics Letters;3/13/2006, Vol. 88 Issue 11, p113504 

    We developed a liquid crystal (LC) alignment method using a molecular template of an imprinted polymer layer during polymerization-induced phase separation. Our results showed that the nematic ordering of LC is transferred to the polymer chain ordering during an anisotropic phase separation,...

  • Liquid crystal micro-lenticular array assembled by a fringing field. Xu, Miao; Ren, Hongwen; Nah, Changwoon; Hee Lee, Seung; Liu, Yifan // Journal of Applied Physics;Mar2012, Vol. 111 Issue 6, p063104 

    Based on dielectrophoretic effect, the phase separation morphology of liquid crystal (LC) in a liquid monomer can be manipulated by a fringing field. Applying the fringing field generated from interdigitated electrode upon the LC/monomer mixture, the randomly dispersed LC droplets can be...

  • Microphase-separated multicontinuous phase in low-molecular-mass thermotropic liquid crystals. Saito, Kazuya // Pure & Applied Chemistry;Oct2009, Vol. 81 Issue 10, p1783 

    Extensive application of chemical thermodynamics to exotic aggregation formed in thermotropic liquid crystals is briefly described. Through thermodynamic analyses and considerations of experimental results on liquid crystals, the unexpected sharing of common properties by thermo- and lyotropic...

  • Growth and luminescence properties of single-crystalline films of RAlO3 ( R = Lu, Lu-Y, Y, Tb) perovskite. Zorenko, Yu. V.; Gorbenko, V. I. // Physics of the Solid State;Sep2009, Vol. 51 Issue 9, p1800 

    The conditions and the mechanisms of crystallization by liquid-phase epitaxy of undoped and Ce3+-doped RAlO3 ( R = Lu, Lu-Y, Y, Tb) single-crystalline films on YAlO3 single-crystalline substrates at a considerable mismatch between the lattice constants of the single-crystalline films and the...

  • Self-organization in phase separation of a lyotropic liquid crystal into cellular, network and droplet morphologies. Iwashita, Yasutaka; Tanaka, Hajime // Nature Materials;Feb2006, Vol. 5 Issue 2, p147 

    Phase separation is one of the most fundamental physical phenomena that controls the morphology of heterogeneous structures. Phase separation of a binary mixture of simple liquids produces only two morphologies: a bicontinuous or a droplet structure in the case of a symmetric or an asymmetric...

  • Special features of the crystallization process in Monte Carlo simulation of nanowhisker growth. Nastov'ak, A. G.; Neizvestny, I. G.; Usenkov, S. V.; Shwartz, N. L. // Russian Physics Journal;Nov2009, Vol. 52 Issue 11, p1170 

    The Monte Carlo method is used to simulate the kinetics of growth and the morphology of one-component nanowhiskers. It is demonstrated that for a proper choice of catalyst and substrate materials, hollow nanowhiskers can grow. The nanotube growth conditions are established. In the process of...

Share

Read the Article

Courtesy of THE LIBRARY OF VIRGINIA

Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics