Photoresponsive and Polarization‐Sensitive Structural Colors from Cellulose/Liquid Crystal Nanophotonic Structures

Anusuyadevi, Prasaanth Ravi; Shanker, Ravi; Cui, Yuxiao; Riazanova, Anastasia V.; Järn, Mikael; Jonsson, Magnus P.; Svagan, Anna J.

doi:10.1002/adma.202101519

Cited by 38 publications

(41 citation statements)

References 35 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: Resultsmentioning

confidence: 99%

“…[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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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: Resultsmentioning

confidence: 99%

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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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“…Preparation of CNCs and fabrication of CNC/GLU ColPRC was obtained following the procedure described in detail in a previous publication. 30 In brief, microcrystalline cellulose (Avicel PH-200) was hydrolyzed using sulfuric acid, followed by iterative centrifugation/washing steps, and dialysis of the supernatant (rich in CNCs) obtained after the third centrifugation step. The obtained CNC suspension was filtered with Whatman filter paper and concentrated to 2.5 wt %.…”

Section: Methodsmentioning

confidence: 99%

Structurally Colored Cellulose Nanocrystal Films as Transreflective Radiative Coolers

et al. 2022

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Radiative cooling forms an emerging direction in which objects are passively cooled via thermal radiation to cold space. Cooling materials should provide high thermal emissivity (infrared absorptance) and low solar absorptance, making cellulose an ideal and sustainable candidate. Broadband solar-reflective or transparent coolers are not the only systems of interest, but also more pleasingly looking colored systems. However, solutions based on wavelength-selective absorption generate not only color but also heat and thereby counteract the cooling function. Intended as coatings for solar cells, we demonstrate a transreflective cellulose material with minimal solar absorption that generates color by wavelength-selective reflection, while it transmits other parts of the solar spectrum. Our solution takes advantage of the ability of cellulose nanocrystals to self-assemble into helical periodic structures, providing nonabsorptive films with structurally colored reflection. Application of violet-blue, green, and red cellulose films on silicon substrates reduced the temperature by up to 9 °C under solar illumination, as result of a combination of radiative cooling and reduced solar absorption due to the wavelength-selective reflection by the colored coating. The present work establishes self-assembled cellulose nanocrystal photonic films as a scalable photonic platform for colored radiative cooling.

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“…The development of anti-counterfeiting materials has attracted particular attention in order to prevent the increasing counterfeits on the current market, including brands, luxury items, banknotes, tickets, and certificates. [1][2][3][4][5][6][7][8][9] In the past few decades, a DOI: 10.1002/advs.202201565 wide variety of security and anticounterfeiting technologies have been developed, including thermal, [10][11][12][13] magnetic, [14] light, [15][16][17] and mechanical responses. [18,19] Therein, the single-mode (photoluminescence or reflective color) with single-state (only one reflective color or fluorescence) is the most widely used, possessing the advantages of a broad range of materials sources, easy operation, and observation.…”

Section: Introductionmentioning

confidence: 99%

Chiral Luminescent Liquid Crystal with Multi‐State‐Reversibility: Breakthrough in Advanced Anti‐Counterfeiting Materials

et al. 2022

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Creating a security material that carries distinct information in reflective color, fluorescence, and chiroptical property will enhance anti‐counterfeiting levels to deter counterfeits ranging from currencies to pharmaceuticals, but is proven extremely challenging. In this work, an advanced anti‐counterfeiting material, with three‐state of each mode reversibly converted into multi‐mode materials including reflective color, fluorescence, and circularly polarized luminescence signal, is constructed by loading photofluorochromic spiropyran (SP) and zinc ion (Zn2+) into the chiral liquid crystal. Under UV irradiation, the complexes of SP and Zn2+ will be transformed into merocyanine (MC) and MC‐Zn2+, while the energy transfer occurs from MC‐Zn2+ to MC. Upon heating, MC is easy to recover to SP, while the MC‐Zn2+ remains unchanged. The MC and MC‐Zn2+ can be transformed into the SP and Zn2+ under visible light irradiation. The three states of each mode can reversibly convert. Furthermore, the reflective color or fluorescence of each state shows different intensities under left‐ and right‐handed circular polarized filters, enabling easy distinguishing by naked eyes. The advanced anti‐counterfeiting method with multi‐state of each mode for multi‐mode encryption information output will provide a new concept for designing and fabricating multi‐mode anti‐counterfeiting materials, improving the security level for practical application.

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Photoresponsive and Polarization‐Sensitive Structural Colors from Cellulose/Liquid Crystal Nanophotonic Structures

Cited by 38 publications

References 35 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

Structurally Colored Cellulose Nanocrystal Films as Transreflective Radiative Coolers

Chiral Luminescent Liquid Crystal with Multi‐State‐Reversibility: Breakthrough in Advanced Anti‐Counterfeiting Materials

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