Recent Advances in Colloidal Photonic Crystal-Based Anti-Counterfeiting Materials

Pan, Mengyao; Wang, Lebin; Dou, Shuliang; Zhao, Jiupeng; Xü, Hongbo; Wang, Bo; Zhang, Leipeng; Li, Xiaobai; Pan, Liqing; Yao, Li

doi:10.3390/cryst9080417

Cited by 43 publications

(25 citation statements)

References 69 publications

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“…Finally, Figure 4d displays a distinctive feature of the products obtained at −1.5 < R OH < −1.0: Particles obtained in this range behave, in a concentration dependent manner, in dispersion like the magnetic‐responsive photonic crystals known from various solvothermal syntheses. [ 9–11,64–69 ] Thus, they are capable to diffract light in dependence of the strength of an applied magnetic field which counteracts their mutual steric and electrostatic repulsion, leading to a precise balance, which is crucial to obtain the observed effect. [ 9,11,66–69 ]…”

Section: Resultsmentioning

confidence: 99%

“…In the recent decades, a lot of effort was put into achieving nanoscale magnetite. The reason for this extraordinary interest in the nano form of magnetite is its applicability in, for example, ferrofluids, [ 5,6 ] as inductively heatable objects, [ 3,7 ] for magnetically supported identification and authentification, [ 8,9–11 ] for wastewater treatment and separation applications, [ 12–15 ] for catalysis, [ 12,14–17 ] as pigment, [ 1,18 ] for sensors [ 12,19 ] as well as in theranostic and biomedical applications. [ 20–23 ]…”

Section: Introductionmentioning

confidence: 99%

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Overcoming the Inhibition Effects of Citrate: Precipitation of Ferromagnetic Magnetite Nanoparticles with Tunable Morphology, Magnetic Properties, and Surface Charge via Ferrous Citrate Oxidation

Granath

Mandel

Löbmann

2021

Part & Part Syst Charact

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This study demonstrates how the method of thermally assisted oxidative precipitation in water can be opened for—the so far neglected—metal organic iron(II) complexes (herein: citrate) in order to obtain, in one step, ferromagnetic magnetite nanoparticles, possessing essential ligand properties. Based on a dedicated analysis of the specific precursor in combination with the consideration of known properties of the ligand, it is possible to identify existing inhibition‐attributes of the iron organyl such that these can be overcome. Moreover, they can be exploited in a targeted manner; thus, simply by changing concentrations, a variety of magnetite nanoparticle morphologies with distinct properties can be obtained. In the case of the herein investigated ferrous citrate, three major inhibition effects are identified. While two of them efficiently prevent the formation of magnetite and need to be addressed to be overcome, the third can be exploited to selectively synthesize, for example, relatively stable carboxyl group‐bearing nuclei clusters, exhibiting the properties of magnetically responsive photonic crystals, or relatively large mesocrystals, whose intraparticular magnetic interactions are apparently disturbed.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Overcoming the Inhibition Effects of Citrate: Precipitation of Ferromagnetic Magnetite Nanoparticles with Tunable Morphology, Magnetic Properties, and Surface Charge via Ferrous Citrate Oxidation

Granath

Mandel

Löbmann

2021

Part & Part Syst Charact

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“…Stimuli-responsive photonic materials have attracted great interest owing to their tunable optical behavior, which is useful for applications in areas such as flexible electronics and soft robotics [1][2][3]. In particular, mechano-optical responsive materials change their optical properties under the application of physical stimuli, such as grinding, pressure, and tensile or shear strain [4][5][6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Environmentally Stable Chiral-Nematic Liquid-Crystal Elastomers with Mechano-Optical Properties

Hisano

Kimura

et al. 2021

Applied Sciences

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Chiral-nematic liquid crystal (N* LC) elastomers exhibit mechano-optical responsive behavior. However, practical sensor applications have been limited by the intrinsic sensitivity of N* LC elastomers to environmental conditions, such as temperature. Although densely cross-linked LC network polymers exhibit high thermal stability, they are not proper for the mechanical sensor due to high glass transition temperatures and low flexibility. To overcome these issues, we focused on enhancing thermal stability by introducing noncovalent cross-linking sites via intermolecular interactions between LC molecules bonded to the polymer network. N* LC elastomers with a cyanobiphenyl derivative as a side-chain mesogen exhibited mechano-optical responsive behavior, with a hypsochromic shift of the reflection peak wavelength under an applied tensile strain and quick shape and color recovery owing to high elasticity. Notably, the N* LC elastomers showed high resistance to harsh environments, including high temperatures and various solvents. Interactions, such as π–π stacking and dipole–dipole interactions, between the cyanobiphenyl units can act as weak cross-links, thus improving the thermal stability of the LC phase without affecting the mechano-optical response. Thus, these N* LC elastomers have great potential for the realization of practical mechano-optical sensors.

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“…By introducing responsive building blocks, polymers, or other components into the colloidal photonic crystals, responsive photonic crystals can be prepared and their color can be changed depending on the physical or chemical stimulations . These photonic crystals with brilliant structural colors have attracted considerable interests due to their growing applications in the field of reflection mode‐based color display, sensor, printing, anti‐counterfeiting, optical device, photocatalysis, and solar cell …”

Section: Introductionmentioning

confidence: 99%

Simple and Ultrafast Fabrication of Invisible Photonic Prints with Reconfigurable Patterns

Yang

Huang

2020

Advanced Optical Materials

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tunable particle sizes can be synthesized in large-scale and low cost, which can be packed into ordered structures with good quality. By introducing responsive building blocks, polymers, or other components into the colloidal photonic crystals, responsive photonic crystals can be prepared and their color can be changed depending on the physical or chemical stimulations. [3][4][5] These photonic crystals with brilliant structural colors have attracted considerable interests due to their growing applications in the field of reflection mode-based color display, [6][7][8][9][10][11] sensor, [12][13][14][15][16][17][18][19][20] printing, [21][22][23][24][25][26][27] anti-counterfeiting, [28][29][30][31][32][33][34] optical device, [35][36][37][38][39] photocatalysis, [40][41][42][43] and solar cell. [44][45][46] Photonic crystal prints show intrinsic advantages in color display and information storage due to their structures induced anti-photobleaching properties compared to the conventional organic dyes or heavy metal pigments. The traditional photonic prints with tailored color contrast between the pattern and background have been widely investigated. These visible photonic prints with elaborate patterns can be prepared through ink-jet printing of particles with different sizes, [26] and selective fixing the structures of photonic crystals by UV light, [47,48] magnetic, [49] and electric field. [7,21,50] In contrast to the visible pattern, invisible photonic prints that can hide and show the patterns under normal circumstance and external stimulus respectively are appealing especially in counterfeiting of high security. However, the practical applications of invisible photonic prints remain a big challenge due to the following reasons: 1) the contrast of the reflection peak between the pattern and background must be as small as possible (ideal state: Δλ = 0) in order to hide the pattern into the background at normal conditions, 2) the color contrast between the pattern and background should be as large as possible to reveal the pattern when the external stimulation is applied, 3) the invisible pattern can be reconfigured repeatedly to realize the low resource consuming and environmentally friendly materials, and 4) the whole fabrication and reconfiguration process should be simple, fast and efficient in an economic way.Currently, various strategies have been developed to fabricate invisible photonic prints on the basis of cross-linking, drying, or modification of the selected regions of photonic papers, and the patterns can be revealed by dint of water, [51][52][53][54] deformation, [55,56] magnetic field, [57] UV light, [58] and vapor of Photonic prints integrated with invisible and reconfigurable patterns are highly desired due to their potential applications in combining anti-counterfeiting, anti-photobleaching, and low-resource consuming. Here, a simple and fast approach is reported to fabricate invisible photonic prints, which are prepared by coating a layer of oleylamine (OAm) on the selective region of hydrop...

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Recent Advances in Colloidal Photonic Crystal-Based Anti-Counterfeiting Materials

Cited by 43 publications

References 69 publications

Overcoming the Inhibition Effects of Citrate: Precipitation of Ferromagnetic Magnetite Nanoparticles with Tunable Morphology, Magnetic Properties, and Surface Charge via Ferrous Citrate Oxidation

Overcoming the Inhibition Effects of Citrate: Precipitation of Ferromagnetic Magnetite Nanoparticles with Tunable Morphology, Magnetic Properties, and Surface Charge via Ferrous Citrate Oxidation

Environmentally Stable Chiral-Nematic Liquid-Crystal Elastomers with Mechano-Optical Properties

Simple and Ultrafast Fabrication of Invisible Photonic Prints with Reconfigurable Patterns

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