Preparation of an Interpenetrating Network of a Poly(ampholyte) and a Cholesteric Polymer and Investigation of Its Hydrochromic Properties

Deng, Zixuan; Zhou, Guofu; Haan, Laurens T. de

doi:10.1021/acsami.9b10013

Cited by 18 publications

(13 citation statements)

References 52 publications

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“…[29,30] Electrically responsive CLC devices change color and/or transparency under the influence of an electric field and are favorable for tunable light reflectors or privacy windows in which multiple optical modes can be altered dependent on the users' preferences. [31][32][33][34] Other CLC devices responsive to water, [35,36] chemicals, [37,38] mechanical forces, [39,40] and interfacing biomolecules [41,42] demonstrated dynamic photonic properties and could be used as sensors and lasers, for instance. In particular, "smart" temperature-responsive CLCs [43] have found their way into numerous applications as they can alter their pitch length, and thus their reflective color, autonomously with a change in temperature.…”

Section: Scope Of the Articlementioning

confidence: 99%

Temperature‐Responsive Photonic Devices Based on Cholesteric Liquid Crystals

Zhang

Froyen

Schenning

et al. 2021

Advanced Photonics Research

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Cholesteric liquid crystals (CLCs) are a major class of photonic materials that display selective reflection properties arising from their helical ordering. The temperature response of CLCs, comprising dynamic reflection color changes upon variation of temperature, is exploited using material systems consisting of small mesogenic molecules, polymer‐dispersed liquid crystals (PDLCs), polymer‐stabilized liquid crystals (PSLCs), or liquid‐crystalline polymers. Taking advantage of the easy processability and flexibility of the molecular design, these temperature‐responsive CLCs are fabricated into different forms of photonic devices, including cells, coatings, free‐standing films, and 3D objects. Temperature‐responsive devices developed from CLCs are integrated for application in temperature sensors, energy‐saving smart windows, smart labels, actuators, and adding aesthetically pleasing features to common objects. Herein, the device capabilities of the different material systems of temperature‐responsive CLCs are summarized: small mesogenic molecules, PDLCs, PSLCs, and CLC polymers. For each system, examples of different device forms are presented, with their temperature responsiveness and the underlying mechanisms discussed. In addition, the potential of each material system for future device applications and product developments is envisioned.

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Section: Scope Of the Articlementioning

confidence: 99%

Temperature‐Responsive Photonic Devices Based on Cholesteric Liquid Crystals

Zhang

Froyen

Schenning

et al. 2021

Advanced Photonics Research

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“…Multifunctional skins with structural colors of some organisms, such as the chameleon and the mimic octopus, can adjust its color according to the environment for protective camouflage. , Inspired by this, stimuli-responsive photonic materials have attracted extensive attention for their potential in the development of applications due to their various functionalities and adjustability. Examples of potential applications are sensing, decoration, and anti-counterfeit devices. , The materials are able to reversibly adjust their color in response to external stimuli, including temperature, humidity, , light, electricity, , magnetism, and stress. , In particular, thermochromic photonic materials that can adjust their reflection band automatically in response to ambient temperature are energy-saving and user-friendly …”

Section: Introductionmentioning

confidence: 99%

Thermochromic Cholesteric Liquid Crystal Microcapsules with Cellulose Nanocrystals and a Melamine Resin Hybrid Shell

Yang

Yuan

Liu

et al. 2022

ACS Appl. Mater. Interfaces

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Thermochromic coatings that can change their color in response to variations in ambient temperature have various potential applications. Cholesteric liquid crystals (CLCs) are promising thermochromic materials due to their selective light reflection and wide regulation range. However, it remains a challenge to fabricate thermochromic coatings that combine good responsivity, mechanical strength, fabrication feasibility, and flexibility. In this study, CLC microcapsules containing cellulose nanocrystals (CNCs) and a melamine–formaldehyde (MF) resin hybrid shell were fabricated via in situ polymerization using CNC-stabilized Pickering emulsions as templates. The CNCs were employed as both Pickering emulsifiers and alignment agents of CLCs to prepare CLC Pickering emulsions. The CLC microcapsules were mixed with curable binders to obtain coating slurries, and thermochromic coatings were prepared by painting the slurries on substrates and drying. The thermochromic coatings could adjust their color in the visible wavelength range in a temperature range of 12 to 42 °C. Moreover, the obtained thermochromic coatings displayed a relatively high reflectance of up to 30–40% and can even be applied to flexible substrates. The CLC microcapsules with CNCs and an MF hybrid shell are promising in the field of smart decorative paints, anti-counterfeit labels, and artificial skins.

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“…Similar RPPs in response to water or other stimulus can also be printed on cholesteric liquid crystals. [ 77–89 ] For example, Schenning's group [ 83,84 ] demonstrated that RPPs can be prepared by selective cross‐linking the cholesteric photonic film, which show reversible color under solvent or different temperature. Despite these successes, most of the fabricated RPPs show simple change in color contrast in response to the solvents.…”

Section: Introductionmentioning

confidence: 99%

Rapid Fabrication of Alcohol Responsive Photonic Prints with Changeable Color Contrasts for Anti‐Counterfeiting Application

Yang

Ouyang

Zhang

et al. 2021

Adv Materials Inter

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Efficient fabrication of responsive photonic prints (RPPs) with specific functionalities is imminently desired owing to its applications in display, anti‐photobleaching, and anti‐counterfeiting. Here, RPPs with changeable color contrasts are fabricated through the region selective swelling of the swellable photonic crystals paper with 2‐hydroxyethyl methacrylate (HEMA) as ink followed by fixing the structures of the swelled regions by photopolymerization. The fabrication process is considerable simple, fast, and efficient, and multicolor RPPs with any desired patterns can be generated within 6 min. Different from the dual/triple color contrasts of conventional RPPs, the as‐prepared RPPs can instantly and reversibly show five color contrasts [(blue/transparent/green/yellow/red)‐red] in the alcohol solution owing to the asymmetric swelling behavior between the background and pattern. The similar solubility parameter between the photonic paper and HEMA/ethanol is the key for the fast fabrication process and abundant color contrasts of RPPs in solvents. The simple and rapid fabrications as well as the responsive properties will extend the applications of RPPs in color display, information storage, and anti‐counterfeiting.

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Preparation of an Interpenetrating Network of a Poly(ampholyte) and a Cholesteric Polymer and Investigation of Its Hydrochromic Properties

Cited by 18 publications

References 52 publications

Temperature‐Responsive Photonic Devices Based on Cholesteric Liquid Crystals

Temperature‐Responsive Photonic Devices Based on Cholesteric Liquid Crystals

Thermochromic Cholesteric Liquid Crystal Microcapsules with Cellulose Nanocrystals and a Melamine Resin Hybrid Shell

Rapid Fabrication of Alcohol Responsive Photonic Prints with Changeable Color Contrasts for Anti‐Counterfeiting Application

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