Self-diffusion method for broadband reflection in polymer-stabilized cholesteric liquid crystal films

Zhang, Xuetao; Shi, Weiting; Han, Rui; Li, Hui; Cao, Hui; Chen, Yinjie; Yang, Zhou; Wang, Dong; He, Wanli

doi:10.1080/02678292.2021.1979114

Cited by 7 publications

(9 citation statements)

References 34 publications

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“…The glass substrate after processing is shown in Figure 2. Glass substrate processing steps are the same as what we did in our previous study 42 …”

Section: Methodsmentioning

confidence: 99%

“…Glass substrate processing steps are the same as what we did in our previous study. 42 Preparation of the adhesive layer: The surface of the glass substrate was treated with the silane coupling agent. First, KH-570, water, and methanol were mixed in the ratio of 5:1:94, and then the glass substrate was immersed in it for 10 min for ultrasonic treatment, then cleaned with nitrogen, and the leftover methanol was blown off with nitrogen gas and put into a vacuum desiccator at 105 C for 1 h for drying.…”

Section: Preparation Of Samples and Cellsmentioning

confidence: 99%

“…Using the polymer network channels of PSCLCs itself as the carrier for substance diffusion, network channels suitable for diffusion were prepared to form the film of a three‐layer liquid crystal system in which broadband reflection could occur 41 . In our previous study, we designed a bilayer self‐diffusing system with polymer networks of cholesteric phase liquid crystals containing chiral compounds and UV‐absorbing dyes, combined with nematic liquid crystals 42 . In the study, the significant effects of chiral compounds and UV‐absorbing dyes on the fabrication of broadband reflective liquid crystal films were identified by controlling a variety of factors affecting pitch distribution.…”

Section: Introductionmentioning

confidence: 99%

“…41 In our previous study, we designed a bilayer self-diffusing system with polymer networks of cholesteric phase liquid crystals containing chiral compounds and UVabsorbing dyes, combined with nematic liquid crystals. 42 In the study, the significant effects of chiral compounds and UV-absorbing dyes on the fabrication of broadband reflective liquid crystal films were identified by controlling a variety of factors affecting pitch distribution.…”

Section: Introductionmentioning

confidence: 99%

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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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“…The glass substrate after processing is shown in Figure 2. Glass substrate processing steps are the same as what we did in our previous study 42 …”

Section: Methodsmentioning

confidence: 99%

Section: Preparation Of Samples and Cellsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

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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“…Meanwhile, due to the presence of 254 nm UV absorbing dye, the masked non-liquid crystal monomers, which are not irradiated by 254 nm UV, gradually migrate toward the irradiated region while further raising the density of PDLC. As the monomer migrates, the concentration gradient of the chiral compound R5011 is also formed in the UV intensity gradient so that the ∆λ is broadened [31].…”

Section: Mechanism Of Broadband Reflectionmentioning

confidence: 99%

Preparation of Flexible Liquid Crystal Films with Broadband Reflection Based on PD&SLC

Zhang

Han

et al. 2022

Materials

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A simple and efficient method for the preparation of a film with flexible characteristic and selective reflection of near-infrared light is proposed. Based on the coexistence system (PD&SLC) of polymer dispersed liquid crystals (PDLC) and polymer stabilized liquid crystals (PSLC), it combines the flexibility of PDLC with the selectively reflection of PSLC. Innovative use of step-by-step light curing to achieve microstructural differences in the three-dimensional orientation of the material is proposed. That is, the difference between PDLC and PSLC in the planar orientation, as well as the gradient distribution of cholesteric phase liquid crystal pitch in the cell thickness direction, is observed. While realizing the flexibility of the material, the function of broadening the reflection bandwidth is fulfilled. This method of preparing liquid crystal films is expected to have great potential for applications, such as flexible smart windows, infrared light shielding, and sensors.

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Progress in Fabrication and Applications of Cholesteric Liquid Crystal Microcapsules

Zhang,

Yang,

Chen

et al. 2023

Chemistry A European J

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Liquid crystals (LCs) are well known for inherent responsiveness to external stimuli, such as light, thermal, magnetic, and electric fields. Cholesteric LCs are among the most fascinating, since they possess distinctive optical properties due to the helical molecular orientation. However, the good flow, easy contamination, and poor stability of small‐molecule LCs limit their further applications, and microencapsulation as one of the most effective tools can evade these disadvantages. Microencapsulation can offer shell‐core structure with LCs in the core can strengthen their stability, avoiding interference with the environment while maintaining the stimuli‐responsiveness and optical properties. Here, we report recent progress in the fabrication and applications of cholesteric LC microcapsules (CLCMCs). We summarize general properties and basic principles, fabrication methods including interfacial polymerization, in‐situ polymerization, complex coacervation, solvent evaporation, microfluidic and polymerization of reactive mesogens, and then give a comprehensive overview of their applications in various popular domains, including smart fabrics, smart sensor, smart displays, anti‐counterfeiting, information encryption, biomedicine and actuators. Finally, we discuss the currently facing challenges and the potential development directions in this field.

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Self-diffusion method for broadband reflection in polymer-stabilized cholesteric liquid crystal films

Cited by 7 publications

References 34 publications

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

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

Preparation of Flexible Liquid Crystal Films with Broadband Reflection Based on PD&SLC

Progress in Fabrication and Applications of Cholesteric Liquid Crystal Microcapsules

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