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Effect of Nanoparticles (CO 3 O 4 ) on the Electro - Optical Properties of Liquid Crystal Acrylate Polymer
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In this paper, the effect of cobalt oxide nanoparticles (CO3O4) on the electro-optical properties of the acrylate liquid crystal was studied. Five different ratios of nanoparticles have been added to a constant molecular weight of liquid crystal acrylate. Where we notice that the viscosity of the polymer will increase affecting the characteristics of the liquid crystal, as well as the temperature of the transfer of glass will decrease because of the added nanoparticles. The order parameter studied in this research using infrared spectroscopy, this is used with the result of the threshold voltage to test the theory as well as studying the effect of cobalt oxide nanoparticles (CO3O4) on the voltage and response times.
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Nonlinearity liquid crystal cell which doped with Ferroelectric nanoparticles characters studied in this paper according to their eclectic absorption. Polysiloxin series with side chain liquid polymers used with side chain polymers and molecular weight ran This study consternate on polymers electro.optic characteristic with various molecular weights by using the mesogenic units and a stable polysiloxane.
Suspension sensitivity or Electro-visual response to the mark of the used electric field, a real character to electric liquid crystals. The addition of Co3O4, nanoparticles to polymer rise dielectric anisotropy and minimize response times. It observed that the voltages rises with molecular weight rising, and when intensity value rise we gain voltage operating.
Spectrometer used infrared measurements to locate the orientational order parameters, ( s ¯ ) for liquid crystals with a side series. The orientational order parameters ( s ¯ ) rely on temperature with various molecular weights and the threshold voltage.
A range of side chain liquid crystal copolymers have been prepared using mesogenic and non-mesogenic units. It is found that high levels of the non-mesogenic moieties may be introduced without completely disrupting the organization of the liquid crystal phase. Incorporation of this comonomer causes a marked reduction in the glass transition temperature (Tg), presumably as a result of enhanced backbone mobility and a corresponding lowering of the nematic transition temperature, thereby restricting the temperature range for stability of the liquid crystal phase. The effect of the interactions between the various components of these side-chain polymers on their electro-optic responses is described. Infrared (i.r.) dichroism measurements have been made to determine the order parameters of the liquid crystalline side-chain polymers. By identifying a certain band (CN stretching) in the i.r. absorption spectrum, the order parameter of the mesogenic groups can be obtained. The temperature and composition dependence of the observed order parameter are related to the liquid crystal phase transitions and to the electro-optic response. It is found that the introduction of the non-mesogenic units into the polymer chain lowers the threshold voltage of the electro-optic response over and above that due to the reduction in the order parameter. The dynamic electro-optic responses are dominated by the temperature-dependent viscosity and evidence is presented for relaxation processes involving the polymer backbone which are on a time scale greater than that for the mesogenic side-chain units.
The development of a screen matrix with liquid crystals is described. The starting point was primarily a matrix concept that envisaged auxiliary elements for the decoupling. However, the concept of using liquid crystals capable of storage proved to be more advantageous in regard to actual realization and the attainment of higher resolution. The end result of the work is a matrix consisting of 16,000 image-pints (each 0.5 x 0.5 sq mm) that utilizes the bistability effect, is suited to the representation of graphical data or alphanumeric symbols, and operates in an erase-write action. Circuit concepts for the integration of the driver elements are worked out. The technological problems associated with the Matrix as well as with general liquid crystal displays (such as surface purification, surface orientation, sealing techniques, and aging processes) are treated.
A series of methacrylate-based side-chain liquid crystal polymers has been prepared with a range of molecular weights. For the high molecular weight polymers a smectic phase is observed with a very narrow nematic range; however, for low molecular weight polymers only the nematic phase is observed. A marked reduction in the glass transition temperature, T(SN) and T(NI) is observed with a reduction in the molecular weight. The orientational order parameters for these polymers in the liquid crystal phase have been determined using infra-red dichroism. It is found that the higher the molecular weight of the polymer, the greater is the threshold voltage of the electro-optic response and the lower the order parameter. The increase in the threshold voltage with increasing molecular weight may be related to the intrinsic curvature elasticity and hence to the coupling between the mesogenic units and the polymer backbone
1st issued as an Oxford Univ. Press Paperback
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Electro-Optical Properties and Effect of BaTiO of Polysiloxane
Khalid Al. Ammar and Hawra'a Abd-Al
Amear Salih,''Electro-Optical Properties and
Effect of BaTiO of Polysiloxane'', Journal of
Engineering and Applied Sciences, 9519-9523, 2018.
Effect of BaTiO3 Nanoparticles Amount Addition on Electro-Optical Properties of Side Chain Liquid Crystal Polymer
- Khalid Al
- Ammar
- Hawra
- Abd-Al Amear Salih
Khalid Al.Ammar, Hawra'a Abd-Al Amear
Salih, "Effect of BaTiO3 Nanoparticles
Amount
Addition on Electro-Optical
Properties of Side Chain Liquid Crystal
Polymer", International Journal of Science and
Research (IJSR), Volume 6 Issue 2, February
2017.