Cholesteric Cellulose Liquid Crystals with Multifunctional Structural Colors

Zhang, Zhuohao; Chen, Zhuoyue; Wang, Yu; Zhao, Yuanjin; Shang, Luoran

doi:10.1002/adfm.202107242

Cited by 77 publications

(82 citation statements)

References 40 publications

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“…Together, the assembly time of PC was adjustable within 1-4.5 h (Figure 1c). Compared to conventional assembly methods (Table S1, Supporting Information), which generally take days [14,44] to weeks [24,45,46] to complete, the present horizontal precipitation method significantly reduced the time of self-assembly of PC, mainly due to the relatively less dispersion in the present method compared to the deeper solutions in conventional vertical deposition methods. Furthermore, compared to previous horizontal depositions of PCs which generally carried out at high temperature, [42,47,48] the present assembly method of PCs was achieved in mild condition at 35 °C, moreover, the obtained PCs in present work exhibited improved quality compared to previous horizontal deposition methods.…”

Section: Fast Self-assembly Of Photonic Crystals and The Work Principlementioning

confidence: 95%

“…[28] At present, structure colors are obtained mainly via two schemes, including top-down fabrications such as direct laser writing, [29] nanoimprinting, [30] solvent release, [31] and bottom-up methods such as the self-assembly of nanoparticles (NPs), [32][33][34][35] cellulose nanocrystals, [36][37][38] block copolymers, [24,39] under capillary force [40,41] or external forces. [42,43] However, the former methods generally require the assistance of sophisticated and expensive equipment, whereas the latter methods generally take a long period from days [14,44] to weeks [24,45,46] with precise environmental control. Therefore, the development of a fast, robust, and convenient fabrication method for photonic crystals (PCs) is highly desired in the field of wearable sensors.Herein, we introduce a fast self-assembly method for PCs based on horizontal precipitation of silica NPs.…”

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confidence: 99%

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Fast Self‐Assembly of Photonic Crystal Hydrogel for Wearable Strain and Temperature Sensor

et al. 2022

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functional materials are used as additives to endow devices with functional properties. [7,8] Although with great success, readouts of the response behaviors of wearable devices generally require sophisticated instruments, which are usually expensive and inconvenient to be portable. To this end, visual colors, which are directly integrated into wearable devices, offer an emerging strategy to intuitively obtain the responsive signals of wearable devices. [9][10][11] Structure color, different from dye and pigment, is a result of a microscale or nanoscale periodic structural material, which commonly exists in natural structures such as butterfly wings and chameleon skins. [12,13] When these periodic distances are within a few hundreds of nanometers, a modulation of the incident white light occurs, resulting in a strengthening in the light with the specific wavelength determined by Bragg's law. [12] Benefiting from structure colors, numerous visual devices, such as actuators, [14] flexible electronics, [15,16] strain sensors, [17][18][19] and other sensors [20,21] have been developed to monitor human motions, [15,16,22] temperature, [23,24] pH, [24] chemical sensing, [25][26][27] and cell monitoring. [28] At present, structure colors are obtained mainly via two schemes, including top-down fabrications such as direct laser writing, [29] nanoimprinting, [30] solvent release, [31] and bottom-up methods such as the self-assembly of nanoparticles (NPs), [32][33][34][35] cellulose nanocrystals, [36][37][38] block copolymers, [24,39] under capillary force [40,41] or external forces. [42,43] However, the former methods generally require the assistance of sophisticated and expensive equipment, whereas the latter methods generally take a long period from days [14,44] to weeks [24,45,46] with precise environmental control. Therefore, the development of a fast, robust, and convenient fabrication method for photonic crystals (PCs) is highly desired in the field of wearable sensors.Herein, we introduce a fast self-assembly method for PCs based on horizontal precipitation of silica NPs. With a hydrophilic polydimethylsiloxane (PDMS) fence on the glass substrate, a meniscus liquid surface between the adjacent NPs was obtained horizontally, which was beneficial to achieve improved and high-quality periodic silica PC (Figure 1a,b). Moreover, this self-assembly process could be completed within 1-4 h due to the less silica dispersion to evaporate, which was much faster than conventional vertical deposition methods and had better quality than horizontal deposition. [47,48] Furthermore, a Structural colors from photonic crystals (PCs) have attracted emerging attention in the research area of wearable sensors. Conventional self-assembly of PC takes days to weeks. Here, a fast self-assembly method of PC with horizontal precipitation of silica nanoparticles (NPs) in a polydimethylsiloxane fence, which can be completed within 1-4 h depending on the fence parameters, is introduced. The resultant PC exhibits tunable structural colors in the e...

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Section: Fast Self-assembly Of Photonic Crystals and The Work Principlementioning

confidence: 95%

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confidence: 99%

Fast Self‐Assembly of Photonic Crystal Hydrogel for Wearable Strain and Temperature Sensor

et al. 2022

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“…Water molecules can strongly combine with hydroxyl groups in the amorphous region of CNCs or HPC, resulting in overall expansion and an increase in pitch 173 , 174 . Various compounds, such as polyethylene glycol (PEG) 175 , polyols 176 , polyacrylamide 177 , glucose 178 , N-methylmorpholine-N-oxide 179 , acrylamide 173 , have been added into the cellulose matrix to further improve its humidity responsiveness. For example, flexible CNC/PEG composite films with uniform and tunable structural colors were prepared as humidity sensors 175 , Fig.…”

Section: Bio-based Lyotropic Lc Architecturesmentioning

confidence: 99%

Self-assembled liquid crystal architectures for soft matter photonics

Pan

et al. 2022

Light Sci Appl

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Self-assembled architectures of soft matter have fascinated scientists for centuries due to their unique physical properties originated from controllable orientational and/or positional orders, and diverse optic and photonic applications. If one could know how to design, fabricate, and manipulate these optical microstructures in soft matter systems, such as liquid crystals (LCs), that would open new opportunities in both scientific research and practical applications, such as the interaction between light and soft matter, the intrinsic assembly of the topological patterns, and the multidimensional control of the light (polarization, phase, spatial distribution, propagation direction). Here, we summarize recent progresses in self-assembled optical architectures in typical thermotropic LCs and bio-based lyotropic LCs. After briefly introducing the basic definitions and properties of the materials, we present the manipulation schemes of various LC microstructures, especially the topological and topographic configurations. This work further illustrates external-stimuli-enabled dynamic controllability of self-assembled optical structures of these soft materials, and demonstrates several emerging applications. Lastly, we discuss the challenges and opportunities of these materials towards soft matter photonics, and envision future perspectives in this field.

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“…In this work, inspired by the beautiful structural colors in nature, which is a unique coloration originated from physical interactions between light and periodic submicrometer architectures of matter (13)(14)(15)(16)(17)(18), we realized a structural coloration of CNTs by coating them with amorphous TiO 2 layers via atomic layer deposition (ALD). Both CNT fibers (CNTFs) and CNT membranes (CNTMs) exhibited controllable and brilliant colors by tuning the thickness of TiO 2 coatings.…”

Section: Introductionmentioning

confidence: 99%

Superdurable and fire-retardant structural coloration of carbon nanotubes

et al. 2022

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Carbon nanotubes (CNTs) are promising candidates for numerous cutting-edge fields because of their excellent properties. However, the inherent black color of CNTs cannot satisfy the aesthetic/fashion requirement, and the flammability of CNTs severely restricts their application in high-temperature environments with oxygen. Here, we realized a structural coloration of CNTs by coating them with amorphous TiO 2 layers. By tuning the TiO 2 coating thickness, both CNT fibers and membranes exhibited controllable and brilliant colors, which exhibited remarkable superdurability that could endure 2000 cycles of laundering tests and more than 10 months of high-intensity ultraviolet irradiation. The TiO 2 -coated CNTs exhibited a notable fire-retardant performance and could endure 8 hours of fire burning. The structural coloration of CNTs with excellent fire retardance substantially improves their performance and broadens their applications.

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Cholesteric Cellulose Liquid Crystals with Multifunctional Structural Colors

Cited by 77 publications

References 40 publications

Fast Self‐Assembly of Photonic Crystal Hydrogel for Wearable Strain and Temperature Sensor

Fast Self‐Assembly of Photonic Crystal Hydrogel for Wearable Strain and Temperature Sensor

Self-assembled liquid crystal architectures for soft matter photonics

Superdurable and fire-retardant structural coloration of carbon nanotubes

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