MATERIALS & DESIGN
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2024
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IF 7.6
Shuxian Zhuang,Wangqiao Chen,Bing Li,Tong Zhang,Yujie Song
Targets can achieve invisibility in the vegetation environments by simulating the reflection spectra of plant green leaves. However, balancing the accuracy and stability of simulation effects, particularly in simulating spectral features caused by water in the leaves, is often challenging. Herein, polyurethane microcapsules encapsulating liquid water (W-PUMCs) were prepared by inverse emulsion polymerization, then mixed with Cr 2 O 3 in specific proportions into the epoxy resin matrix to obtain a material capable of simulating the reflection spectra of green leaves in the visible and near-infrared bands. The normalized similarity (NS) between the spectrum of this material and that of plant (cherry) green leaf can reach 0.9779 in the range of 400–2500 nm. W-PUMCs are used to simulate the spectral characteristics caused by water in the leaves because the spectral NS between W-PUMCs and the green leaf in the 1100–2200 nm range is 0.9930. Cr 2 O 3 is employed to simulate the other major spectral features of green leaves. This strategy guarantees simulation accuracy while simplifying the preparation process and reducing production costs and providing solutions to spectral simulation in the fields of military stealth and ecological protection.
研究领域:
植物学
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材料科学
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光学工程
✓ 已验证
产品关联
DOI
高影响因子
SYNTHETIC METALS
·
2020
·
IF 3.286
Anfeng Zhu,Honglong Xing,Qi Fan,Xiaoli Ji,Ping Yang
Sheet aluminum powder was used as the substrate and aniline as the polymer monomer, to design novel Al/PANI composites via in-situ polymerization, which exhibited high electromagnetic wave absorption properties and low infrared emissivity. These unique bifunctional composite were systematically characterized by X-ray powder diffraction, Fourier transform infrared spectroscopy , scanning electron microscope, IR-2 dual-band emission rate measuring instrument and vector network analyzer. The calculated results showed that the maximum reflection loss value of Al/PANI composite reached −46.09 dB at 14.56 GHz with a film thickness of only 1.0 mm. Meanwhile, the infrared emission rate of the composite was 0.55. The excellent electromagnetic absorption performance may be ascribed to its superior conductivity and unique structure. The merits of as-synthesized composites with high-performance microwave absorbing properties and low infrared emissivity indicate the potential use of Al/PANI composites in the applicable stealth fields.
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2021
·
IF 8.128
Mingtao Qiao,Yurui Tian,Jiaxin Li,Xiaowei He,Xingfeng Lei,Qiuyu Zhang,Mingliang Ma,Xiaorong Meng
Multiband-compatible stealth materials play an increasingly crucial role in the field of modern military defence because they can enable the targeted objects to dodge advance detection technologies. In this study, chain-like Fe 3 O 4 @poly(ethyleneglycol dimethacrylate- co -methacrylic acid) nanocomposites were constructed as precursors through the magnetic field-induced distillation precipitation polymerisation. Then, the liquid-phase seed-mediated growth method, together with subsequent calcination , was applied to introduce SnO 2 shells and remove poly(ethyleneglycol dimethacrylate- co -methacrylic acid) shells, which led to the successful preparation of innovative core–shell Fe 3 O 4 @SnO 2 nanochains. The unique microstructure and appropriate components endowed nanochains with multiple functional applications. The minimum reflection loss value was approximately −39.4 dB (5.67 GHz), exhibiting excellent microwave absorption performance. The possible microwave absorption mechanisms involve interfacial polarisation, space charge polarisation, natural resonance, and multiple reflections and scatterings. The optimal infrared reflectivity reached 0.64, 0.51, and 0.37 in three atmospheric windows, indicating outstanding infrared stealth performance, which was attributed to the intense infrared reflection of SnO 2 shells. Furthermore, three nanochains showed different colours (dark green, brick red, and bright orange), revealing selection absorption for visible light . This can be attributed to the combined effect of visible responses of SnO 2 shells along with Bragg diffraction from the periodic arrangement of Fe 3 O 4 particles in a single nanochain. Thus, core-shell Fe 3 O 4 @SnO 2 nanochains can be considered as promising radar-infrared-visible compatible stealth materials. This discovery opens a new means to exploit multiband-compatible stealth materials.
研究领域:
材料科学
·
国防科技
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纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
OPTICAL MATERIALS
·
2020
·
IF 2.779
Yun Yang,Shujuan Tan,Gang Fang,Zhiyan Yang,Yongchao Li,Chaowen Yang
In high temperature environments, most low-emissivity coatings show monotonous and dull colors which make the visible-infrared compatible stealth still challenging. To achieve a wide range of color selection , in this work, three-dimensional (3D) SiO 2 –ZnO amorphous photonic crystals (APCs) are manufactured by electrodepositing Zn 2+ into 3D SiO 2 APCs, investigating the compatibility of adjustable structural color and low emissivity. A variety of structural colors could be easily obtained by modulating the diameter of SiO 2 nanospheres . In addition, the experimental parameters of spin-coating counts and electrodeposited time are studied to optimize the compatible performance of color and infrared emissivity. The results indicate that the doped ZnO effectively reduces the infrared emissivity in 3–5 μm waveband without changing the structural color of SiO 2 APCs. However, excess electrodeposited time of ZnO would cause the structural color faded gradually because of the increased refractive index and destroyed periodical structure. The adequate spin-coating counts is helpful for the bright structural color, but excess spin-coating counts would induce more defects in periodic structure and result in more absorption in 3–5 μm waveband. When the spin-coating counts and electrodeposition content of Zn 2+ in the SiO 2 APCs are properly modulated in this study, the SiO 2 –ZnO APCs can exhibit a good compatibility in desired structural color and low infrared emissivity (~0.4), as well as excellent thermal stability. This study provides a new approach for the design of multi-spectrum compatible stealth materials.
研究领域:
材料科学
·
光子学
·
红外技术
·
隐身材料
·
纳米材料
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）