Cholesteric Liquid Crystal Polymeric Coatings for Colorful Artificial Muscles and Motile Humidity Sensor Skin Integrated with Magnetic Composites

Advanced Functional Materials, Journal Year: 2023, Volume and Issue: 33(23)

Published: Feb. 28, 2023

Abstract Structural colorful cholesterics show impressive susceptibility to external stimulation, leading applications in electro/mechano‐chromic devices. However, out‐of‐plane actuation of structural actuators based on and the integration with other stimulation remains underdeveloped. Herein, motile humidity sensors are developed using humidity‐responsive cholesteric liquid crystal networks (CLCNs) magnetic composites. The actuator can exhibit synergistic shape morphing color change response humidity, CLCNs as artificial muscles. Through control, sensor be navigated open confined spaces aid friction detect local relative humidity. multi‐stimulation will expand research frontier for spaces.

Language: Английский

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Regulating droplet impact symmetry by surface engineering

Droplet, Journal Year: 2023, Volume and Issue: 2(2)

Published: March 16, 2023

Abstract Droplet impact on solid surfaces is essential both in nature and industry. Precisely regulating the dynamic behavior of droplet great significance for energy harvesting, anti‐icing, inkjet printing, pesticide spraying, many other fields. Various rebounding behaviors (deposition, rebounding, rotation, instability control, so on) intrinsic parameters (such as contact time) after droplets impacting can be regulated by surface engineering. This paper reviews advances from perspective symmetry modifying following aspects: chemical modification physical structure regulation, which discussed mirror rotational symmetry. Firstly, dynamics its influencing factors are introduced. Then modulation symmetry, using homogeneous heterogeneous chemically modified surfaces, summarized. The presents influence structures, micro to macro scale compared size, Finally, future challenges opportunities regulation discussed.

Language: Английский

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Nanostructure-free crescent-shaped microparticles as full-color reflective pigments

Nature Communications, Journal Year: 2023, Volume and Issue: 14(1)

Published: Feb. 11, 2023

Structural colors provide a promising visualization with high color saturation, iridescent characteristics, and fade resistance. However, pragmatic uses are frequently impeded by complex manufacturing processes for sophisticated nanostructures. Here, we report facile emulsion-templating strategy to produce crescent-shaped microparticles as structural pigments. The micro-crescents exhibit brilliant under directional light originating from total internal reflections optical interferences in the absence of periodic nanostructures while being transparent ambient light. finely tunable adjusting size micro-crescents, which can be further mixed enrich variety. Importantly, pre-defined convex surface secures stability enables coloration on target surfaces through direct deposition inks. We anticipate this class nanostructure-free colorants is invisible inks particular anti-counterfeiting patches cosmetics distinctive impressions due low-cost, scalable manufacturing, unique properties, versatility.

Language: Английский

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Mosaic Patterned Surfaces toward Generating Hardly‐Volatile Capsular Droplet Arrays for High‐Precision Droplet‐Based Storage and Detection

Small, Journal Year: 2023, Volume and Issue: 19(14)

Published: Jan. 8, 2023

Precise detection involving droplets based on functional surfaces is promising for the parallelization and miniaturization of platforms significant in epidemic investigation, analyte recognition, environmental simulation, combinatorial chemistry, etc. However, a challenging considerable task obtaining mutually independent droplet arrays without cross-contamination simultaneously avoiding evaporation-caused quick reagent loss, inaccuracy, failure. Herein, strategy to generate hardly-volatile capsular using innovative mosaic patterned developed. The evaporation suppression 1712 times higher than naked droplet. high attributed synergistic blocking upper oil bottom gasproof layer. scale-up arrays, flexibility shape, size, component (including aqueous, colloidal, acid, alkali solutions), liquid volume, high-precision hazardous substance testing proves concept's compatibility practicability. with amazingly are essential new generation high-performance open-surface microfluidic chips used COVID-19 diagnosis primary screening, vitro enzyme reactions, monitoring, nanomaterial synthesis,

Language: Английский

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Recent progress in artificial structural colors and their applications in fibers and textiles

Chemistry - Methods, Journal Year: 2023, Volume and Issue: 3(9)

Published: Feb. 13, 2023

Abstract Structural colors have been regarded as an ideal alternative to pigments because of the advantages environmental friendliness, resistance fading, especially in fields textile dyeing and printing, which is highly polluted traditional ways needs be upgraded. They are generated by interaction between micro/nano structure material surface incident light, closely related sizes periods structures. Based on different nano arrangements, structures can roughly divided into photonic crystals non‐photonic crystals. In this review, we summarized recent research progress structural coloration fibers textiles. Learning from nature, researchers proposed various methods fabricate biomimetic colors, applications colored textiles were extended. The challenges perspectives also presented. Hopefully, reference for design preparation color‐based inspired.

Language: Английский

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Lattice Transformation-Induced Retroreflective Structural Colors

ACS Applied Materials & Interfaces, Journal Year: 2023, Volume and Issue: 15(40), P. 47350 - 47358

Published: Sept. 28, 2023

Retroreflective structural colors can usually be achieved based on interference combined with a total internal reflection mechanism or diffraction of monolayer hexagonal two-dimensional (2D) colloidal array. Here, novel retroreflective color was generated hexagonal-parallelogram lattice transformation by stretching 3D photonic crystals nonclosely packed long-range order. Compared to previous colors, this new exhibits two unique off/on switches: (1) strain-dependent switch along the direction and (2) sample horizontal rotation angle-dependent under fixed strain. These strain-responsive are ideal candidates for visually sensing kinesio tapes' strain in practical applications anticounterfeiting. This work reveals regulation will advance potential anticounterfeiting, sensing, displays, etc.

Language: Английский

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Nonpolar Solvent Modulated Inkjet Printing of Nanoparticle Self‐Assembly Morphologies

Small, Journal Year: 2023, Volume and Issue: 19(28)

Published: May 16, 2023

Abstract Patterning of luminescent nanomaterials is critical in the fields display and information encryption, inkjet printing technology have shown remarkable significance with advantage fast, large‐scalable integrative. However, nanoparticle deposits high‐resolution well controlled morphology from nonpolar solvent droplets still challenging. Herein, a facile approach modulated nanoparticles self‐assembly patterns driven by shrinkage droplet inner solutal convection proposed. Through regulating composition concentration, multicolor light‐emissive upconversion microarrays tunable morphologies are achieved, showing integration designable microscale photoluminescences for multimodal anti‐counterfeit. Furthermore, self‐assembled continuous lines adjustable controlling coalescence drying ink achieved. The high resolution lines’ width < 5 10 µm realized, respectively. This solvent‐modulated facilitates patterning different nanomaterials, expected to provide versatile platform fabricating advanced devices applied photonics integration, micro‐LED, near‐field display.

Language: Английский

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Additive manufacturing of micropatterned functional surfaces: a review

International Journal of Extreme Manufacturing, Journal Year: 2024, Volume and Issue: 6(4), P. 042004 - 042004

Published: April 23, 2024

Abstract Over the course of millions years, nature has evolved to ensure survival and presents us with a myriad functional surfaces structures that can boast high efficiency, multifunctionality, sustainability. What makes these particularly practical effective is intricate micropatterning enables selective interactions microstructures. Most have been realized in laboratory environment using numerous fabrication techniques by tailoring specific surface properties. Of available manufacturing methods, additive (AM) created opportunities for fabricating as complex architectures naturally occurring microstructures far exceed traditional ways. This paper concise overview fundamentals such patterned microstructured surfaces, their techniques, diverse applications. A comprehensive evaluation micro methods conducted, delving into respective strengths limitations. Greater emphasis placed on AM processes like inkjet printing digital light projection due intrinsic advantages additively fabricate resolution fidelity precision. The explores various advancements relation use microfabrication also recent trends applications microlens arrays, microneedles, tissue scaffolds.

Language: Английский

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Recent progress on structural coloration

Photonics Insights, Journal Year: 2024, Volume and Issue: 3(2), P. R03 - R03

Published: Jan. 1, 2024

Structural coloration generates colors by the interaction between incident light and micro- or nano-scale structures. It has received tremendous interest for decades, due to advantages including robustness against bleaching environmentally friendly properties (compared with conventional pigments dyes). As a versatile strategy, tuning of structural based on nanoscale photonic structures been extensively explored can enable broad range applications displays, anti-counterfeiting, coating. However, scholarly research had limited impact commercial products because their disadvantages in cost, scalability, fabrication. In this review, we analyze key challenges opportunities development colors. We first summarize fundamental mechanisms design strategies while reviewing recent progress realizing dynamic coloration. The promising potential optical information processing displays are also discussed elucidating most prominent that prevent them from translating into technologies market. Finally, address new underexplored community but be achieved through multidisciplinary within emerging areas.

Language: Английский

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Toward High Sensitivity: Perspective on Colorimetric Photonic Crystal Sensors

Analytical Chemistry, Journal Year: 2022, Volume and Issue: 94(27), P. 9497 - 9507

Published: June 27, 2022

The sensitivity of colorimetric photonic crystal (PC) sensors have been significantly improved with the advancement deformable structural color materials, structures design, sensing signal analysis methods, and fabrication strategies. In this perspective, strategies toward high-sensitivity PC are discussed, from perspectives molecular single sensor construction, multisensor assembly, which include incorporation flexible polymer chains, construction strong sensor–analyte interactions, more soft stimuli-angle/orientation relationship, design in series, assembly parallel. Based on these strategies, progress recent years is summarized, terms mechano-sensors chemo-/biosensors. Specifically, based optical-electrical dual-signal devices included. Finally, future development challenges presented, regards to properties, optical

Language: Английский

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