Light scattering from acrylate-based polymer dispersed liquid crystals: theoretical considerations and experimental examples

Leclercq, Laurent; Maschke, Ulrich; Ewen, Bernd; Coqueret, Xavier; Méchernène, L.; Benmouna, M.

doi:10.1080/026782999205191

Cited by 16 publications

(7 citation statements)

References 26 publications

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“…This issue becomes even more complicated if to consider liquid crystal (LC) droplets [2][3][4][5][6][7], for example, polymer-dispersed liquid crystal (PDLC) films because orientation structure within the droplets is commonly inhomogeneous. Configuration of LC director (a unit vector n characterizing preferred molecular orientation for a local volume in a droplet) can be rather complicated [2,3,7].…”

Section: Introductionmentioning

confidence: 99%

“…Configuration of LC director (a unit vector n characterizing preferred molecular orientation for a local volume in a droplet) can be rather complicated [2,3,7]. Consecutive development of special simulation techniques by many research groups (see, for instance, the lists of some of them in [6,7]) allows now calculating adequately the light scattering pictures for actual LC dispersions.…”

Section: Introductionmentioning

confidence: 99%

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Experimental results and theoretical model to describe angular dependence of light scattering by monolayer of nematic droplets

Loiko¹,

Krakhalev²,

Konkolovich³

et al. 2016

Journal of Quantitative Spectroscopy and Radiative Transfer

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Light scattering by a monolayer of bipolar nematic droplets encapsulated in polymer film is examined both experimentally and theoretically. A method for the simulation of the angular distribution of scattered light is based on the anomalous diffraction and interference approximations taking into account the director configuration within liquid crystal droplets and their bipolar axes orientation. The director configuration in nematic droplets is calculated using the relaxation method of the free energy minimization. The characteristics of the sample, including distribution of droplet sizes and shape anisometry, are measured in details. The experimental results and theoretical data agree closely with each other.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Experimental results and theoretical model to describe angular dependence of light scattering by monolayer of nematic droplets

Loiko¹,

Krakhalev²,

Konkolovich³

et al. 2016

Journal of Quantitative Spectroscopy and Radiative Transfer

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“…The polymer balls in lms C1-C3 formed high density aggregates. Thus, the hazes of lms C1-C3 are basically maintained at 95.0% due to the multiple light scattering of the polymer ball aggregates, [25][26][27][28][29][30][31][32][33][34][35] as shown in Fig. 9(B).…”

Section: The Effect Of the Functionality Of The Curing Agent On The Omentioning

confidence: 93%

“…Generally, the scattering theories, such as the Rayleigh-Gans approximation and the anomalous diffraction approximation, are applied in investigations of polymer/LC composites based on polymer networks and nematic LCs. [25][26][27][28][29][30][31][32][33][34][35] Herein, as the polymer network becomes micro-size anisotropic polymer balls, the Mie scattering theory was applied in the system, which inferred that the scattering intensity of the lm is inversely Fig. 4 The optical properties of optical diffusers A1-A3; (A) total transmissions of optical diffusers A1-A3; (B) transmission hazes of optical diffusers A1-A3.…”

Section: The Effect Of the Curing Temperature And The Curing Time On mentioning

confidence: 99%

“…[51][52][53][54] As for the light scattering of polymer/nematic LC composite lms, there are many models focusing on single scattering and multiple scattering in the polymer/nematic LC composite lms. [55][56][57][58][59][60][61][62][63] In this study, we prepared optical diffusers based on polymer micro-balls/nematic LCs. As the average diameter size of polymer micro-balls was larger than the incident light wavelength, Mie scattering was applied in the system.…”

Section: 6mentioning

confidence: 99%

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A novel optical diffuser based on polymer micro-balls-filled nematic liquid crystal composite film

et al. 2018

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Thermophysical and Structural Properties of Polymer/Liquid Crystal Systems Using Polysiloxanes

Gogibus

Bouberka

Bedjaoui

et al. 2016

Encyclopedia of Analytical Chemistry

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This article deals with polymer dispersed liquid crystals (PDLCs) using polysiloxanes and low‐molecular‐weight liquid crystals (LCs). These composite materials exhibit generally a film texture consisting of nearly spherical microdomains filled with LC molecules and dispersed in a solid polymer matrix. These compounds are interesting because they raise a number of still unresolved fundamental questions, they lead to applications in the market of display devices and switchable windows and potential applications are foreseen in telecommunications. Applications of these systems are based essentially on their electrooptical responses when they are activated with an electric field. In the common situation of normal mode conditions, PDLC films are initially opaque but they become transparent to incident light when an electric field is applied. Understanding the electrooptical responses requires a detailed investigation of thermophysical properties and morphology to quantify the miscibility parameters and identify textures under various conditions of temperature and composition. This is the first step toward establishing correlations with the electrooptical properties and in particular understanding the variation of light transmission through the film before (off‐state) and after application of the field (on‐state).This work gives a detailed description of thermophysical and morphology properties in polymer/LC systems made of linear monodisperse polysiloxanes and nematic LCs. Two different polysiloxanes were used: poly(dimethylsiloxane) or PDMS and poly(methylphenylsiloxane) or PMPS with different molecular weights. Likewise, two model LCs were employed: the eutectic mixture of cyanoparaphenylenes E7 and the single component 4‐cyano‐4′‐n‐pentyl‐biphenyl or 5CB. A variety of experimental tools are employed to reach a good view on the film morphology, evaluate the thermophysical parameters, construct the phase diagrams, and understand the structural properties. The experimental data are rationalized in terms of a theoretical formalism adopted to the specific conditions of our systems.

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Light scattering from acrylate-based polymer dispersed liquid crystals: theoretical considerations and experimental examples

Cited by 16 publications

References 26 publications

Experimental results and theoretical model to describe angular dependence of light scattering by monolayer of nematic droplets

Experimental results and theoretical model to describe angular dependence of light scattering by monolayer of nematic droplets

A novel optical diffuser based on polymer micro-balls-filled nematic liquid crystal composite film

Thermophysical and Structural Properties of Polymer/Liquid Crystal Systems Using Polysiloxanes

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