Switching performance of a polymer-stabilized antiferroelectric liquid crystal based on bent-core molecules

Atorf, Bernhard; Hoischen, Andreas; Ros, M. Blanca; Gimeno, Nélida; Tschierske, Carsten; Dantlgraber, Gert; Kitzerow, Heinz‐S.

doi:10.1063/1.4722794

Cited by 13 publications

(8 citation statements)

References 31 publications

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“…Since both doping and polymer networks stabilize the Sm-C * FI2 Sm-C * FI1 phases of AFLCs [2,7,[13][14][15][16][17], we are able to determine which process is more effective by comparing the temperature intervals of the intermediate phases before and after irradiation with UV light. The results are contained in Fig.…”

Section: Resultsmentioning

confidence: 99%

“…The idea of developing materials that combine the mechanical strength of a polymer and the optical and electro-optical properties of a liquid crystal is quite attractive to display designers and manufacturers. If introduced into an antiferroelectric liquid crystal, polymer networks improve the alignment of the liquid crystal and reduce the switching times [2]. Photopolymerization, using either ultraviolet radiation or tuneable lasers, plays a central role in the preparation of blends for specific applications.…”

Section: Introductionmentioning

confidence: 99%

“…The dopants included carbon nanotubes [12], bent core molecules [2], chiral nonliquid crystalline dopants [7,13], chiral and nonchiral liquid crystalline materials [14], and opposite-handed enantiomers [15,16]. In general, these studies show that the stability of the antiferroelectric phase(s) is greatly enhanced in the doped materials.…”

Section: Introductionmentioning

confidence: 99%

“…In general, these studies show that the stability of the antiferroelectric phase(s) is greatly enhanced in the doped materials. However, much less attention has been devoted to the steric effects of polymer networks on the corresponding phase transitions [2,17].…”

Section: Introductionmentioning

confidence: 99%

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Modifying optical Bragg reflections from an antiferroelectric liquid crystal with photopolymer networks

Singh

Bradshaw

2013

Phys. Rev. E

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By using an achiral monomer and a photoinitiator, we introduced polymer networks into the Sm-C* phase of an antiferroelectric liquid crystal that forms ferro-, ferri-, and antiferroelectric phases. We then investigated the temperature dependence of Bragg wavelengths selectively reflected from these samples and found that the reflection bands shift to shorter wavelengths with increasing polymer concentration. The intermediate and the Sm-C*(A) phases dominate over the Sm-C* phase for polymer concentration ≥4% by weight and the Sm-C* phase disappears completely for a 6% polymer sample.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Modifying optical Bragg reflections from an antiferroelectric liquid crystal with photopolymer networks

Singh

Bradshaw

2013

Phys. Rev. E

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“…Of the materials presently used in displays, only ferroelectrics and antiferroelectrics offer potential for switching times in the sub-microsecond range [10]. However, antiferroelectric liquid crystals (AFLCs) show larger switching angles of the optical axis than ferroelectric liquid crystals FLCs which is essential in achieving higher contrast ratios [11]. In AFLCs-based devices, the surface-stabilized Sm-C* A phase serves as the dark state while the field-induced SmC* phase forms the bright state [12].…”

Section: Introductionmentioning

confidence: 99%

Morphology of polymer networks formed in the chiral and non-chiral phases of an antiferroelectric liquid crystal

Singh

Spink

Davis

et al. 2015

Chemical Physics Letters

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We introduced photo-polymer networks into the various liquid crystalline phases of the antiferroelectric liquid crystal AS612 and studied the effects of these networks by measuring the temperature dependence of the Bragg wavelengths selectively reflected. After polymerization, the decrease in Bragg wavelengths with respect to the original values is consistent with a shorter helical pitch due to polymer network shrinkage. Also, by removing the liquid crystalline material, we are able to image the residual polymer network using scanning electron microscopy and polarized light microscopy. The polymer strands are a few microns thick and the networks show both chiral and nonchiral features.

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Preparation of polymer‐stabilized cholesteric liquid crystal films capable of broadband reflection using a three‐layer system of self‐diffusion

Liu,

Zhang,

Cao

et al. 2023

Polymers for Advanced Techs

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Through a simple and effective method for preparing broadband reflective liquid crystal films, the advantages of the three‐layer system are expanded based on the two‐layer system. The cholesteric liquid crystals form a prepolymerized layer after semi‐curing. In the design of the top prepolymerization layer, there is less content of the chiral compound R5011, which results in the formation of cholesteric liquid crystal molecules with a larger pitch. Mainly by controlling the content of polymerizable monomers and UV‐absorbing dyes in cholesteric liquid crystals (CLCs), a polymer network with density gradient distribution suitable for substance diffusion is formed, and the oleophobic substrate on one side of the low‐density polymer network is more likely to be peeled off. In the design of the lowest prepolymerization layer, the content of R5011 is higher, which results in the formation of cholesteric liquid crystals with a larger pitch. One side substrate of two cholesteric liquid crystal cassettes is peeled off and merged into a new liquid crystal cassette whose left and right sides are stacked with septum pads (20 μm), and the nematic liquid crystals are poured into the middle layer to form a three‐layer integrated film. The polymer network of the polymer‐stabilized cholesteric liquid crystals (PSCLCs) itself in the bilayer was used as a diffusion channel. Chiral compounds and UV‐absorbing dyes were diffused from the cholesteric liquid crystal layer to the intermediate nematic liquid crystal layer by diffusion gradient method, resulting in liquid crystal films with arbitrary wavelength bands and ultrawide broadband reflection.

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Switching performance of a polymer-stabilized antiferroelectric liquid crystal based on bent-core molecules

Cited by 13 publications

References 31 publications

Modifying optical Bragg reflections from an antiferroelectric liquid crystal with photopolymer networks

Modifying optical Bragg reflections from an antiferroelectric liquid crystal with photopolymer networks

Morphology of polymer networks formed in the chiral and non-chiral phases of an antiferroelectric liquid crystal

Preparation of polymer‐stabilized cholesteric liquid crystal films capable of broadband reflection using a three‐layer system of self‐diffusion

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