Structure and near-infrared spectral properties of mesoporous silica for hyperspectral camouflage materials

Lv, Xiaojiong; Liu, Yuan; Rao, Congshi; Wu, X.; Qing, Xiaolong; Weng, Xiaolong

doi:10.1016/j.infrared.2023.104558

Cited by 10 publications

(1 citation statement)

References 34 publications

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“…Lv et al integrated high moisture-absorbing mesoporous molecular sieves into camouflage coatings to emulate the water absorption valley feature of leaves. However, the near-infrared spectral reflectance of the material was markedly higher than that of actual leaves 6 .…”

Section: Introductionmentioning

confidence: 78%

Hygroscopic Mg–Al LDHs composite microspheres for highly efficient hyperspectral camouflage in the VIS and NIR wavebands

Xie,

Yuan,

Qing

et al. 2024

Sci Rep

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In order to enhance the hyperspectral camouflage efficacy of stealth coatings against a natural vegetative backdrop, LiCl, known for its significant hygroscopic properties, was incorporated into green Mg–Al layered double hydroxide (Mg–Al LDHs) material. Micron-sized composite microspheres were subsequently synthesized via the spray-drying granulation technique. The structure, morphology, and chemical composition of these microspheres were thoroughly characterized by X-ray diffraction, scanning electron microscopy, laser particle size analysis, nitrogen adsorption–desorption isotherms, and Fourier-transform infrared spectroscopy. The effect of LiCl content on the moisture absorption capacity and near-infrared reflectance spectra of the microspheres was systematically evaluated. We found that incorporating an optimal amount of LiCl into the internal pores of the Mg–Al LDHs microspheres did not compromise their smooth surface morphology and uniform particulate distribution. Notably, when the LiCl content was 10%, the maximum saturation moisture uptake ratio of the coating increased to 0.75 g/g. This hygroscopicity significantly enhanced the absorption and scattering of near-infrared radiation by the coating while concurrently improving its ability to modulate the shape and reflectance of both the visible and near-infrared spectral curves. Spectral congruence between the synthetic coating and natural green foliage was quantified at 97.41%. Moreover, this performance was maintained over 10 cycles of programmed drying and re-humidification, and the coating consistently demonstrated stable hygroscopic properties and sustained over 95% spectral congruence. These optimized artificial coatings were found to effectively confuse hyperspectral classification algorithms, thus blending seamlessly into a natural foliage backdrop. This study provides a new method for regulating VIS and NIR spectral (visible–near infrared spectrum) features, which will be critical for applications in advanced hyperspectral camouflage materials.

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Section: Introductionmentioning

confidence: 78%

Hygroscopic Mg–Al LDHs composite microspheres for highly efficient hyperspectral camouflage in the VIS and NIR wavebands

Xie,

Yuan,

Qing

et al. 2024

Sci Rep

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Synthesis of Chlorophylls‐Doped Guanine Crystals with High Reflection and Depolarization for Green Camouflage Coating

Zhang,

Ren,

Hao

et al. 2024

Chemistry An Asian Journal

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Hyperspectral imaging technology can record the spatial and spectral information of the targets and significantly enhance the levels of military reconnaissance and target detection. It has scientific importance to mimic “homochromatic and homospectral”camouflage materials of green vegetation. It is a big challenge to exquisitely simulate the spectral of green vegetation in visible and near‐infrared windows because of the slight differences between the artificial green dyes and vegetation, the instability of chlorophylls. Herein, a novel kind of biomimetic material of green vegetation was designed through the incorporation of chlorophylls into the crystal lattices of single‐crystalline anhydrous guanine microplates for the first time. The synthesized chlorophylls‐doped anhydrous guanine crystals exhibit high reflectance intensity and depolarization effect, thus can be applied as biomimetic camouflage materials that mimic green vegetation in the visible and near‐infrared regions. The factors influencing the formation of dye‐doped organic crystals under mild conditions were thoroughly investigated and the characterizations using electron microscopies clearly confirm the occlusion of chlorophylls into the crystal lattices of guanine crystals. The thermal stability experiments clearly indicate that the chlorophylls‐doped guanine crystals possess long‐term stability at high temperatures. This study provides a new strategy for the synthesis of multifunctional materials comprised of organic crystals.

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Stepwise extraction of Fe, Si from copper slag and self-assembly synthesis of microspheres for As(V) removal: Resource transformation and environmental governance

Chen,

Li,

Tan

et al. 2024

Chemical Engineering Journal

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Structure and near-infrared spectral properties of mesoporous silica for hyperspectral camouflage materials

Cited by 10 publications

References 34 publications

Hygroscopic Mg–Al LDHs composite microspheres for highly efficient hyperspectral camouflage in the VIS and NIR wavebands

Hygroscopic Mg–Al LDHs composite microspheres for highly efficient hyperspectral camouflage in the VIS and NIR wavebands

Synthesis of Chlorophylls‐Doped Guanine Crystals with High Reflection and Depolarization for Green Camouflage Coating

Stepwise extraction of Fe, Si from copper slag and self-assembly synthesis of microspheres for As(V) removal: Resource transformation and environmental governance

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