A dual responsive photonic liquid for independent modulation of color brightness and hue

Liu, Yun; Fan, Qingsong; Zhu, Guanghao; Shi, Gongpu; Ma, Hui; Wei, Li; Wu, Tianlong; Chen, Jitao; Yin, Yadong; Guan, Jianguo

doi:10.1039/d1mh00556a

Cited by 46 publications

(36 citation statements)

References 58 publications

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“…This is different from our previous hydrogel-based photonic nanochains, which generally show flexible curved states, and only become straight under magnetic field (H). [38,39] The straight morphology could be attributed to the stiffness of the coating layer PGDMA. As shown in Figure 1c,d, the PNC is composed of linearly arranged and uniform inorganic colloidal particles, which are wrapped and linked by a polymer shell of about 13 nm in thickness.…”

Section: Resultsmentioning

confidence: 99%

Lipophilic Magnetic Photonic Nanochains for Practical Anticounterfeiting

Luo

Che

et al. 2022

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effects of counterfeit and shoddy products in banknotes, commodities, medicines, and identity cards. [6][7][8][9] During past decades, various anticounterfeiting technologies have been developed including simple watermarks, bar and quick response codes, radio frequency identification, nuclear track, optical metasurfaces, and ink printing. [10][11][12][13][14][15][16][17] Among them, optically variable inks (OVIs) are one of the most intuitive and effective ways to produce anticounterfeiting labels. They are currently mainly based on film interference, where the perceived color only switches between a pair of color with viewing angles. [18] Alternatively, photonic crystals (PCs) may show continuously tunable colors with remarkable angle dependence in a wide visible range by changing external stimuli due to the physical interaction of light with their intrinsic periodically ordered nanostructures. [19][20][21][22][23][24][25] These features ensure significant difficulties in duplication and imitation, and enable them to be promising for the next-generation of OVI.Compared to 3D nonmagnetic colloidal PCs, [26][27][28] 1D magnetic PCs possess high refractive index, high resolution, and precise controllability in security patterns with magnetic-field (H)-assisted photonic printing technology. [29,30] Recently, much attention has been paid to the development of their application in optical anticounterfeiting labels. For instance, by adopting an invisible photonic Magnetic photonic crystals (PCs) possess attractive magnetic orientation, flexible pattern designability, and abundant angle-dependent colors, providing immense potential in anticounterfeiting field. However, all-solid magnetic PCs-based labels generally suffer from incompatibility with screen printing techniques, and inferior environmental endurance and mechanical properties. Herein, by developing a selective concentration polymerization method under magnetic field (H) in microheterogenous dimethyl sulfoxide-water binary solvents, individual tens-of-micrometer-length lipophilic magnetic photonic nanochains (PNCs) of full-width at half-maxima below 30 nm are fabricated, which, after simply dispersed in solvent-free cycloaliphatic epoxy resin, can be formulated as photonic inks to print robust anticounterfeiting labels through an H-assisted screen-printing technology. The as-printed labels possess vivid optically variable effects (OVEs) associated with the spatial distribution of H directionality, which are easy to identify by the naked eye but difficult to imitate and duplicate, while they show excellent environmental resistance and mechanical properties, promising practical applications in banknotes and high-grade commodities. The polymerization mechanism of the lipophilic PNCs is elucidated, and the OVEs are deciphered in numerical simulation. Besides an efficient way to build organic-inorganic hybrid nanostructures, the work provides advanced structural color pigments to achieve the practical application of magnetic PCs in such an anticounterfeiting field.

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Section: Resultsmentioning

confidence: 99%

Lipophilic Magnetic Photonic Nanochains for Practical Anticounterfeiting

Luo

Che

et al. 2022

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“…Under an external magnetic field, the polymerization of NIPAM on Fe 3 O 4 CPs surface produced individual 1D periodical nanochains linked by polymers. [ 108 ]…”

Section: Construction Of Supramolecular Photonic Compositesmentioning

confidence: 99%

Bioinspired Supramolecular Photonic Composites: Construction and Emerging Applications

Lyu

Zhang

et al. 2022

Macromol. Rapid Commun.

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Living organisms have evolved fascinating structural colors to survive in complex natural environments. Artificial photonic composites developed by imitating the structural colors of organisms are applied in displaying, sensing, biomedicine, and many other fields. As emerging materials, photonic composites mediated by supramolecular chemistry, namely, supramolecular photonic composites, are designed and constructed to meet emerging application needs and challenges. This review mainly introduces the constructive strategies, properties, and applications of supramolecular photonic composites. First, constructive strategies of supramolecular photonic composites are summarized, including the introduction of supramolecular polymers into colloidal photonic array templates, coassembly of colloidal particles (CPs) with supramolecular polymers, self-assembly of soft CPs, and compounding photonic elastomers with functional substances via supramolecular interactions. Supramolecular interactions endow photonic composites with attractive properties, such as stimuli-responsiveness and healability. Subsequently, the unique optical and mechanical properties of supramolecular photonic composites are summarized, and their applications in emerging fields, such as colorful coatings, real-time and visual motion monitoring, and biochemical sensors, are introduced. Finally, challenges and perspectives in supramolecular photonic composites are discussed. This article provides general strategies and considerations for the design of photonic materials based on supramolecular chemistry.

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“…[6][7][8][9][10][11][12][13] By combining responsive polymer materials and colloidal crystals, responsive PCs can respond to extrinsic stimuli such as light, [14] thermal, [15,16] pressure, [17,18] electric field, [19] and magnetic field. [20] Meanwhile, these responsive PCs can change structural color by adjusting the inherent physical parameters based on Bragg's law, such as the lattice constant (d), [21] the viewing angle (α), [22,23] and the effective refractive index of materials (n avg ). [24] Due to tunable lattice parameters, responsive PCs show potential application prospects in the fields of color display, [25,26] textile coloring, [27,28] chemical sensors, [29,30] information security, [31] or other colorrelated fields.…”

Section: Introductionmentioning

confidence: 99%

Multicolor Invisible Patterns Encrypted in Double‐Inverse‐Opal Films Based on Thermally Induced Structural Deformation

Zhou

Zhang

et al. 2022

Physica Rapid Research Ltrs

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The integration of invisible photonic patterns into specific micro/nanostructures provides a new way to construct stimuli‐responsive optical anti‐counterfeiting devices. Herein, an innovative strategy for constructing highly invisible patterns in the solvent‐responsive double‐inverse‐opal (DIO) films by the thermal treatment is proposed. The masked area retains the responsive DIO structure, but the exposed area loses the periodic ordered array, which results in different optical responses of the pattern and background to the solvent. Due to the special structure, the scattering effect derived from the randomly distributed polystyrene microspheres within the pores of the inverse‐opal backbone in both the masked area and the exposed area makes the resultant film sample present a pale color, and the encrypted pattern is highly invisible in normal conditions. Interestingly, the hidden pattern can be quickly revealed by ethanol response, showing a large color contrast. Furthermore, reversible bilayer DIO films with multiple hidden patterns for advanced anti‐counterfeiting materials are prepared. Importantly, the as‐prepared film sample can reveal different patterns on the front and back sides in decryption, and simultaneously the overlapping part of the patterns can achieve color mixing based on the bilayer structure, thereby showing great potential in information encryption and anti‐counterfeiting fields.

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A dual responsive photonic liquid for independent modulation of color brightness and hue

Abstract: Responsive chromic materials are highly desirable in the fields of displays, anti-counterfeitings, and camouflages but their advanced applications usually limit by the unrealized delicate and independent tunability in the three...

Cited by 46 publications

References 58 publications

Lipophilic Magnetic Photonic Nanochains for Practical Anticounterfeiting

Lipophilic Magnetic Photonic Nanochains for Practical Anticounterfeiting

Bioinspired Supramolecular Photonic Composites: Construction and Emerging Applications

Multicolor Invisible Patterns Encrypted in Double‐Inverse‐Opal Films Based on Thermally Induced Structural Deformation

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