CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Litao Lin,Tengchao Guo,Yu Chen,Xiaochi Lu,Bin Quan,Xiaogu Huang
The advancement of hyperspectral detection technology has challenged the development of hyperspectral camouflage materials. Despite the high spectral similarity of existing bio-inspired hyperspectral materials, their poor weather resistance limits their application in harsh environments. To address this, it is essential to enhance the weather resistance of hyperspectral materials while maintaining high spectral similarity. Therefore, inorganic hyperspectral materials are employed to improve durability. However, these inorganic materials generally exhibit lower spectral similarity and insufficient near-infrared reflectance, which restricts their ability to match the spectral characteristics of diverse plant backgrounds. To enhance spectral and color similarity with green plants, this study investigates Cr 2-x Ti x O 3 , which exhibits low visible reflectance and high near-infrared reflectance. The impact of annealing temperature on reflectance (400–1300 nm) was assessed using SEM, XRD, XPS, and UV–Vis–NIR spectroscopy. The influence of free carrier concentration and particle size on reflectance was analyzed. Hyperspectral coatings based on Cr 2-x Ti x O 3 were prepared, demonstrating tunable hyperspectral reflectance. Results indicate that Cr 2-x Ti x O 3 annealed at 1100 °C has the highest near-infrared reflectance, largest red-edge slope, and tunable range, with low visible reflectance. Ultimately, the optimized spectral similarity of these coatings can reach 97 %, coupled with superior environmental durability.
研究领域:
材料科学
·
光学工程
✓ 已验证
产品关联
DOI
高影响因子
Materials
·
2014
·Vol. 7
·期 7
·4982-4993
·
IF 1.879
Lihong Gao,Zhuang Ma,Song Wang,Fuchi Wang,Cai Yang
La1−xSrxTiO3+δhas attracted much attention as an important perovskite oxide. However, there are rare reports on its optical properties, especially reflectivity. In this paper, its structural and optical properties were studied. The X-ray diffraction, X-ray photoelectron spectroscopy, scanning electron microscopy and spectrophotometer were used to characterize the sample. The results show that with increasing Sr concentration, the number of TiO6octahedral layers in each “slab” increases and the crystal structure changes from layered to cubic structure. A proper Sr doping (x= 0.1) can increase the reflectivity, reaching 95% in the near infrared range, which is comparable with metal Al measured in the same condition. This indicates its potential applications as optical protective coatings or anti-radiation materials at high temperatures.Keywords:perovskite structure;La1−xSrxTiO3+δ;structural property;reflectivity
研究领域:
材料科学
·
物理学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
APPLIED OPTICS
·
2019
·Vol. 58
·期 18
·4926-4932
·
IF 1.973
Yuxiao Hou,Xiaohong Li,Hang Luo,Wei Lei,Hong Lei
We theoretically simulate the antireflective effects of oxide nanosphere monolayer films in the visible spectrum. The essential geometric and material parameters of nanosphere films are simulated and different functions are proposed to describe the dependence of reflectance on the influencing factors. The rational function is fitted to describe the monotonic decreasing of reflectance on the ratio of nanospheres’ radius to incident wavelength. At a wavelength of 550 nm and incidence at 75°, the reflectance of the glass substrate coated with SiO2 decreases to 14.1% compared with 41.7% of the uncoated glass. The results have an excellent potential for applications in optical devices such as filters, polarizing elements, and camera lenses.
研究领域:
光学
·
材料科学
✓ 已验证
DOI
PubMed
高影响因子
Entropy
·
2019
·Vol. 21
·期 2
·180
·
IF 2.419
Xiaoyi Chen,Hongbo Xu,Mengyao Pan,Jiupeng Zhao,Yao Li,Ying Song
Cracks and defects, which could result in lower reflectivity and larger full width at half maximum (FWHM), are the major obstacles for obtaining highly ordered structures of colloidal crystals (CCs). The high-quality CCs with high reflectivity (more than 90%) and 9.2 nm narrow FWHM have been successfully fabricated using a fixed proportion of a soft matter system composed of silica particles (SPs), polyethylene glycol diacrylate (PEGDA), and ethanol. The influences of refractivity difference, volume fractions, and particle dimension on FWHM were illuminated. Firstly, we clarified the influences of the planar interface and the bending interface on the self-assembly. The CCs had been successfully fabricated on the planar interface and presented unfavorable results on the bending interface. Secondly, a hard sphere system consisting of SPs, PEGDA, and ethanol was established, and the entropy-driven phase transition mechanism of a polydisperse system was expounded. The FWHM and reflectivity of CCs showed an increasing trend with increasing temperature. Consequently, high-quality CCs were obtained by adjusting temperatures (ordered structure formed at 90 °C and solidified at 0 °C) based on the surface phase rule of the system. We acquired a profound understanding of the principle and process of self-assembly, which is significant for preparation and application of CCs such as optical filters.Keywords:soft matter;colloidal crystals;self-assembly;entropy-induced
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
PROGRESS IN SOLID STATE CHEMISTRY
·
2025
·
IF 10.5
Zhiwei Wang,Yinan Shen,Liangsheng Tian,Suwit Suthirakun,Wongsathorn Kaewraung,Qi Menghang,Hang Zhao,Xin Xin,Ruoxiu Xiao,Peng Jiang,Qu Li,Tingting Lu
The coating optimized with high near-infrared reflectance pigments can effectively reduce the energy consumption for heating and cooling in buildings, thereby alleviating the pressure on global energy consumption. Using a high-temperature solid-state method, blue-violet pigments with high near-infrared reflectance, Ca 2 Zn 1- x M x Si 2 O 7 (M = Mn, 0 ≤ x ≤ 0.4 and Ni, 0 ≤ x ≤ 0.2) solid solutions, were synthesized for the first time, with a maximum solar reflectance of 82.67%. Using XPS analysis, it was determined that the oxidation state of Ni in the pigment is +2, while Mn exists in mixed oxidation states of +2 and +3. UV-VIS-NIR spectroscopy analysis indicates that the blue-violet color of the pigment originates from the d-d transitions of the transition metal ions. As the doping concentration increases, the near-infrared reflectance of the pigment decreases. The DFT calculations have also confirmed that the color of pigments originates from transition metal ions. The as-synthesized pigments were incorporated into acrylic to create colored coatings. Improving the near-infrared solar reflectance of the acrylic coating. The excellent high near-infrared solar reflectance and coating property optimization make the synthesized pigment a potential energy-saving coating.
研究领域:
材料科学
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能源工程
·
化学
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Qin Yao,Jian Zou,Jun Yang
The high solar reflectance and good colour performance are requisite for the practical application of the colour-cool pigment. In this work, Ce-doped Yb 3 Al 5 O 12 and (Y, Yb) 3 Al 5 O 12 ceramic pigments were prepared by the sol-gel method. Both Ce 3+ and Ce 4+ ions coexist in the doped pigments. Due to the 4f→5d electron transition of Ce 3+ , the Ce-doped pigments have a selective absorption at around 400–520 nm, which is responsible for the yellow hue. The content of the Ce 3+ ion determines the colour performance of the pigment. The size effect from the smaller Yb 3+ ion results in an increased content of Ce 3+ in the Ce-doped pigments, leading to an improved colour performance. The incorporation of Y 3+ ion can effectively decrease the absorption at 975 nm, thereby enhancing the solar reflectance to 80.6 %, while maintaining good colour performance (Yb 0.7 Y 2.1 Ce 0.2 Al 5 O 12 , L* = 91.40, a* = -4.89, b* = 45.33). In a simulation experiment, the ceramic glaze coating based on the prepared pigment showed a temperature reduction of 5.2 °C compared to the commercial yellow pigment ceramic coating .
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2024
·
IF 7.1
Qiuying Wang,Zhiwei Wang,Menghang Qi,Hang Zhao,Xin Xin,Anjali Verma,Theeranun Siritanon,Arthur P. Ramirez,M.A. Subramanian,Peng Jiang
The severe urban heat island effect emphasizes the heightened importance of reducing building energy consumption. Cool pigments with higher near-infrared reflectivity contribute to the overall coating performance of the building. In this work, a novel intense blue pigment with superior infrared reflectance based on Ni-doped Zn2SiO4 was successfully synthesized via the simple solid-state method. The crystal structure, oxidation states, and optical properties are analyzed. The oxidation state of Ni was confirmed to be +2 using magnetic analysis and XPS. The intense blue color exhibited by the solid solution is due to the 3T1(3F) → 3T1(3P) transition of Ni2+ at the tetrahedral sites. UV–vis–NIR spectra demonstrate that this pigment exhibits superior near-infrared reflectance compared to cobalt blue in the range of 900–1700 nm, indicating its potential application in the realm of building energy conservation.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
OPTICAL MATERIALS
·
2021
·
IF 3.08
Tao Liang,Gang Peng,Xiangzhe Zhang,Yuehua Wei,Xiaoming Zheng,Wei Luo,Mengyan Dai,Chuyun Deng,Xueao Zhang
Two-dimensional materials with optical turnability have wide prospect in related applications such as electrochromic coating and thermal camouflage. Here we report a Li-intercalated ultrathin graphite device with tunable visible-near-infrared reflectivity . After Li-ion intercalation, the Fermi surface of ultrathin graphite will move to a higher level, which prevents the interband optical transitions below it. Therefore, it is possible to change the absorptivity or emissivity of ultrathin graphite through reversible Li-ion intercalation, which accomplishes the modification to reflectivity indirectly. In our experiment, the strong fluorescence background and Peak shifts in Raman spectra , as well as the enlarged layer spacing in XRD spectra, together confirmed that Li-ions were successfully intercalated into the graphite layers. The relative reflectivity of ultrathin graphite increased sharply in a wide range from 460 nm to 1500 nm after complete Li-ion intercalation. At a typical near-infrared wavelength 1500 nm for instance, the relative reflectivity is 0.28 for pristine graphite while 0.70 for fully lithiated graphite. Such reversible intercalated modulation in visible-near-infrared reflectivity of ultrathin graphite might provide a new way to design electrochromic coating, thermal camouflage or radar stealth systems, which also promotes further understanding and optical applications of graphene and other 2D materials.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
Nano-Micro Letters
·
2022
·Vol. 14
·期 1
·1-16
·
IF 23.655
Yang Jie,Chan Kit-Ying,Venkatesan Harun,Kim Eunyoung,Adegun Miracle Hope,Lee Jeng-Hun,Shen Xi,Kim Jang‐Kyo
Highly porous aerogel with longitudinally aligned channels and whisker-like ligaments is constructed by solvent-assisted unidirectional freezing.
The thermal insulation and solar reflection capabilities of the composite aerogel reach a state-of-the-art level.
The composite aerogel capable of infrared stealth and temperature preservation presents great potential for application in energy-saving buildings.
研究领域:
材料科学
·
能源工程
✓ 已验证
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Meixia Wu,Xiao Zhou,Xihui Liang,Yifeng Han,Yonghong Li,Xingan Jiang,Xueyun Wang,Yisheng Chai,Xiang Zhou,Hui Yang,Dan Lin,Ping Xu,Man-Rong Li
Multifunctional thermochromic materials integrated optical, ferroelectric, and/or magnetic properties have been long envisioned and played an invaluable role in signal processing and non-contact optical information storage in smart windows. However, poor materials stability, together with high discoloration temperature, absence of ferroelectric, or magnetic behaviors, impedes most thermochromic materials for practical applications. Here, the thermochromic behavior of all-inorganic lead-free ferroelectric Sn 2 P 2 S 6 (SPS) is extensively studied, which exhibits a reversible color change between light orange and red around the ferroelectric-paraelectric phase transition temperature (∼ 67 °C). In situ powder X-ray diffraction (PXRD) and Raman spectroscopy indicate the change of P-S and Sn-S bond distance, and thus result in the modification of (P 2 S 6 ) octahedral geometry and the coordination environment of Sn 2+ ions along with the evolution of thermochromism (TCM). Additionally, the first-principles calculations reveal that, the Sn 5 s 2 stereochemically active lone pair electrons evoke negative lattice expansion comparable to that of the known ZrW 2 O 8 at warming and is responsible for the reversible TCM of SPS. SPS also possesses high near-infrared reflectance ( R > 80 %, 1100-2500 nm). The integration of ferroelectricity, high near-infrared reflectance, and TCM below 100 °C renders potential applications of the titled compound in multifunctional optical smart windows.
研究领域:
材料科学
·
光学
·
物理化学
✓ 已验证
DOI
高影响因子
Nanomaterials
·
2024
·Vol. 14
·期 7
·608
·
IF 4.4
Wei Liu,Yang Zou,Yuang Chen,Zijian Lei,Lili Zhao,Lixin Song
This work involves the introduction of niobium oxide into lanthanum aluminate (LaAlO3) via a conventional solid-state reaction technique to yield LaAlO3:Nb (LaNbxAl1−xO3+δ) samples with Nb5+doping levels ranging from 0.00 to 0.25 mol%. This study presents a comprehensive investigation of the effects of niobium doping on the phase evolution, defect control, and reflectance of LaNbxAl1−xO3+δpowder. Powder X-ray diffraction (XRD) analysis confirms the perovskite structure in all powders, and XRD and transmission electron microscopy (TEM) reveal successful doping of Nb5+into LaNbxAl1−xO3+δ. The surface morphology was analyzed by scanning electron microscopy (SEM), and the results show that increasing the doping concentration of niobium leads to fewer microstructural defects. Oxygen vacancy defects in different compositions are analyzed at 300 K, and as the doping level increases, a clear trend of defect reduction is observed. Notably, LaNbxAl1−xO3+δwith 0.15 mol% Nb5+exhibits excellent reflectance properties, with a maximum infrared reflectance of 99.7%. This study shows that LaNbxAl1−xO3+δpowder materials have wide application potential in the field of high reflectivity coating materials due to their extremely low microstructural defects and oxygen vacancy defects.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Materials
·
2021
·Vol. 14
·期 6
·1406
·
IF 3.623
Chenglong Lv,Mei Zu,Dongjin Xie,Haifeng Cheng
The emulation of the reflectance of green leaf in the solar spectral band (300–2500 nm) has garnered increasing attention from researchers. Currently, various materials have been proposed and investigated as potential bionic leaves. However, the problems such as poor weather durability, heavy metal pollution, and complex preparation technology still persist. Herein, a bionic leaf is prepared from an ultramarine green pigment as the functional material, polyvinylidene fluoride (PVDF) as the film-forming material, and LiCl as the humidizer. To prepare the ultramarine green pigment, the sulfur anion is added into the β cage of the 4A zeolite. The mechanisms and properties were discussed based on X-ray diffraction (XRD), scanning electron microscopy (SEM), Raman spectroscopy, and spectroscopic methods. The results show that the as-fabricated bionic leaf based on the 4A zeolite-derived ultramarine green pigment was able to demonstrate a high spectral similarity coefficient of 0.91 with the green leaf. Furthermore, the spectral similarity coefficient was increased to 0.94 after being subjected to a simulated rainforest environment for 48 h, which indicated its high weather durability.Keywords:bionic leaf;green pigment;solar reflectance;4A zeolite;ultramarine green
研究领域:
材料科学
·
光谱学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）