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
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
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
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
·
2024
·Vol. 130
·期 8
·1-13
·
IF 2.5
Yang Duo,Wang Jing,Shi Jun,Ren Jie
In this study, four-element high entropy carbonate solid solutions with Mg as the primary element and three equimolar transition metal elements (Co, Ni, Zn, Fe, Mn and Cu) were successfully prepared using the hydrothermal method. The crystal structure, microstructure, color properties, and reflectance of the synthetic materials were characterized using techniques such as X-ray diffraction (XRD), scanning electron microscopy (SEM), ultraviolet-visible-near-infrared (UV-Vis-NIR) spectrophotometry. The results indicate that the existence of Cu impacts the formation of solid solution phase, especially in combination with Fe, leading to the formation of a heterophase. By changing the combination of elements, the band gap of the high-entropy carbonate was adjusted from 2.09 eV to 5.56 eV. The colorimetric coordinates, according to CIE 1976 Lab, ranged from L 34.54 ∼ 89.80, a * -22.06 ∼ 5.41, and b * -1.75 ∼ 39.38, allowing for coverage from blue to red tones. The coexistence of Cu and Fe resulted in a deep reddish-brown color, which is likely related to charge transfer transitions. Additionally, different combinations of high-entropy carbonates showed significant differences in near-infrared reflectance, reaching up to 83% in the 780 nm to 2500 nm band range, indicating potential applications in high-reflective insulation materials.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Yuhan Yang,Zhidong Pan,Ti Zhang,Yanmin Wang
A series of (Nd 1- x Er x ) 6 MoO 12 ( x = 0, 0.2, 0.4, 0.6, 0.8 and 1.0) pigments were synthesized via solid-state reactions. The pigments were characterized by X-ray diffraction (XRD), thermogravimetry and differential thermal analysis (TG-DSC), diffuse reflectance spectroscopy and colorimetry. The results show that erbium-doped rhombohedral neodymium molybdate (i.e., (Nd 0.8 Er0.2) 6 MoO 12 ) pigment with the maximum Δ E ∗ max of 18.48 and the NIR reflectance of 85.63 % synthesized under the optimum condition has an allochroic effect under different illuminants. Erbium ions doping in Nd 6 MoO 12 (R) is beneficial in improving the near-infrared (NIR) reflectivity and allochroic effect of the pigment. The temperature on the surface of aluminium panels coated with (Nd 1- x Er x ) 6 MoO 12 pigments is 17.2 °C lowder than that of aluminium panels uncoated due to the higher NIR reflectance of (Nd 1- x Er x ) 6 MoO 12 pigment for heat insulation. In addition, the chromaticity analysis of (Nd 0.8 Er0.2) 6 MoO 12 pigment reveals that the allochroic effect of the pigment is mainly affected due to the characteristic absorption peaks at wavelengths of 600 nm and 530 nm, and the influence of the characteristic absorption peaks at a wavelength of 600 nm on the allochroic effect of the pigment is more dominant rather than that of the characteristic absorption peaks at a wavelength of 530 nm.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Weilun Qian,Yan Ma,Zhoufu Wang,Hao Liu,Zhongfeng Xia,Zhenghuang Quan,Xitang Wang,Shenghao Zeng,Weidong Fu,Luwei Fu
The near-infrared (NIR) reflective thermal insulation coating can effectively reflect heat and protect the base materials. With excellent high-temperature stability and low thermal conductivity, SrY 2 O 4 attracted much attention due to its unique thermophysical characteristics. However, the NIR reflectance of SrY 2 O 4 is scarcely reported. In this work, a novel low-temperature solid-state reaction synthesis of SrY 2 O 4 is explored, which aims to solve the problems of high temperature (1400–1650 °C) and repeated calcination during the synthesis process via conventional solid-state reaction method, and the NIR reflectance of SrY 2 O 4 is evaluated. SrY 2 O 4 powders with few Y 2 O 3 impurities are obtained at 1100–1300 °C via low-temperature solid-state reaction method. And Y 2 O 3 impurities are successfully eliminated, resulting in a simple synthesis of single-phase SrY 2 O 4 powder at 1200 °C by adjusting the ratio of raw materials to n (Sr 2+ ):n (Y 3+ ) = 1.10:2. The thermal decomposition process and composition of the precursor were analyzed by Fourier transform infrared spectrum (FTIR) and thermogravimetric/differential scanning calorimetry (TG-DSC), respectively. The cell parameters, micromorphology, NIR reflectance and thermal conductivity of SrY 2 O 4 powders synthesized via low-temperature and conventional solid-state reaction method are comparative studied. The result shows that single-phase SrY 2 O 4 powder obtained via low-temperature solid-state reaction method has smaller cell parameters, minor particle size and higher NIR reflectance. The NIR reflectance maintains above 90 % and thermal conductivity at 25 °C is 7.37 W m −1 K −1 .
研究领域:
材料科学
·
热物理学
✓ 已验证
产品关联
DOI
高影响因子
SOLID STATE SCIENCES
·
2022
·
IF 3.752
Shenghao Zeng,Zhoufu Wang,Yan Ma,Xitang Wang,Hao Liu,Yunjie Dong,Yueying Li,Entao Qiao,Weilun Qian
A series of lanthanum-cerium oxides with different lanthanum content were synthesized by low-temperature solid-state method, and the effect of lanthanum content on the thermal conductivity and near-infrared reflectance of lanthanum-cerium oxide ceramics was systematically investigated. The results indicated that the thermal conductivity of lanthanum-cerium oxide ceramics decreased significantly with the increase of lanthanum content, which was mainly due to the non-negligible phonon scattering caused by the increased point defects in the structure. Lanthanum-cerium oxide ceramics with different lanthanum content had high near-infrared reflectivity (82%) between 1200 and 2200 nm. The lanthanum-cerium oxide ceramics prepared in this work has lower thermal conductivity and higher near-infrared reflectivity, which has broad application prospects in the field of high-temperature energy saving as thermal insulation material.
研究领域:
材料科学
·
能源工程
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Luo Feng,Liqing Li,Meiqi Zhang,Yijie Yang,Xiaoqi Sun
This paper reports the syntheses of a series of polychromatic pigments with the general formula LiAl 1- x M x (MoO 4 ) 2 (M = Fe, Pr, Ho, Nd, Er, Ce; x = 0–0.4) and the characterization of near-infrared reflectance properties. The synthesized pigments exhibited green (Pr), lavender (Nd), pink (Er) and different yellows (Fe, Ho, Ce). The XRD patterns of typical LiAl 1- x Fe x (MoO 4+δ ) 2 samples show that the prepared samples are triclinic lithium aluminum molybdate structures with space group P -1.The iron in the sample mainly existed in the form of Fe 3+ , which led to the directional growth of grains with different morphologies. The near-infrared solar reflectance (R*%) of LiAl 1- x Fe x (MoO 4 ) 2 pigments reached 94.19%. As the doping concentration of rare earth was increased, the color of the pigments gradually deepens. By introducing rare earth elements Pr, Ho, Nd, Er, and Ce into the LiAl(MoO 4 ) 2 matrix, the color of the pigment was successfully changed from white to green, lavender, pink, and yellow, indicating that doping can control the color of the pigment. Moreover, the prepared pigments had high R*% (>87%), indicating that the pigment samples have excellent thermal insulation properties and can be used as a new type of reflective thermal insulation coatings.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Junying Xiao,Zhidong Pan,Ti Zhang,Youjun Lu,Yanmin Wang
Mica/(Ni, Sb)-co-doped rutile yellow composite pigment with a high near-infrared reflectance was prepared via mechanochemical pretreatment and subsequent sintering. (Ni, Sb)-co-doped rutile yellow pigment was synthesized by a solid-phase method in the presence of sodium fluoride (NaF) as a mineralizer, and mica was peeled by ultrafine grinding . The pigment, mica and mica/pigment composite were characterized by X-ray diffraction, laser diffraction particle size analysis , nitrogen gas adsorption method, scanning electron microscopy, energy dispersive spectroscopy, ultraviolet–visible–near-infrared spectroscopy, CIE L * a * b * color scales, and infrared irradiation image, respectively. The results show that the temperature of synthesizing a pure rutile pigment in solid-phase reaction is reduced by 100°C due to the addition of mineralizer NaF. (Ni, Sb)-co-doped rutile pigment has better color rendering performance and near-infrared (NIR) reflectance. Ultrafine grinding produces the finer flatty mica particles with fresh reflective surfaces, thus improving NIR reflectance of peeled mica. In mica/pigment composite prepared via mechanochemical pretreatment and subsequent sintering, peeled mica has a synergistic effect on (Ni, Sb)-co-doped rutile pigment particles to further scatter near-infrared radiation through the multiple layer reflections, leading to a better heat insulation . The high near-infrared reflectance of composite pigment increases to 97.72%, and the b * value of the pigment synthesized with 1 wt% NaF is 37.77. For the irradiation infrared lamp, the surface temperature of aluminum plate coated with mica/(Ni, Sb)-co-doped rutile yellow composite pigment is 40.1 ± 0.2°C, which is lower than that of aluminum plate uncoated determined by thermal camera and thermocouple. When aluminum plate coated with mica/(Ni, Sb)-co-doped rutile yellow composite pigment is under sunshine, its surface temperature is 38.6 ± 0.2°C. In addition, the mechanism of preparing the composite pigment via mechanochemical pretreatment and subsequent sintering and the multiple structure reflection effect on peeled mica surface coated with (Ni, Sb)-co-doped rutile yellow pigment particles were also discussed.
研究领域:
材料科学
·
化工
·
颜料技术
·
热绝缘
✓ 已验证
产品关联
DOI
高影响因子
Applied Materials Today
·
2025
·
IF 6.9
Ruiying Zhai,Sisi Chen,Jiahao Lu,Yijie Yang,Xiaoqi Sun
This study developed a series of yellow and orange pigments with enhanced near-infrared reflectivity. These pigments were prepared through high-temperature solid-state reaction, CeO 2 doping, and Bi 2 MoO 6 modification. The pigment samples exhibit Bi 2 MoO 6 related to the monoclinic crystal system, with no discernible peaks of oxide impurities. The pigments were transformed from white to yellow and orange by doping Ce ions, which have better color performance. The reflectance in the infrared spectrum and near-infrared solar reflectance of all pigment samples were found to be greater than 95 %. After 60 min of exposure to infrared radiation, the internal temperature difference between the Bi 1.88 Ce 0.12 MoO 6-δ painted iron house model and Bi 1.88 Ce 0.12 MoO 6-δ unpainted iron house model reached 8 °C. The color change of Bi 1.88 Ce 0.12 MoO 6-δ was minimal in acidic, alkaline, and high-temperature environments, thus confirming its excellent stability. These characteristics indicate that the synthesized Bi 1.88 Ce 0.12 MoO 6-δ pigment has considerable potential in energy saving and multifunctional coatings.
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
·
2023
·
IF 8.4
Shuo Yang,Yufeng Cai,Sizhe Tang,Yujie Song,Bing Li,Dongyan Tang,Ming Liu
Radiative cooling provides a low-energy consumption remedy for the urban heat island effect. However, most radiative cooling materials use light-colored surfaces to achieve higher reflectivity, which not only causes light pollution problems but also degrades performance after surface contamination. Here, we through the design of the polymer structure used perylene diimide with coloration ability to prepare the crimson polymer perylene poly(aryl ether) (P-FAPE) by simple condensation reaction and prepared the superhydrophobic film with a porous structure by the method of nonsolvent-induced phase transformation. The polymer film has high near-infrared reflectance, with a maximum reflectance of 93% in the near-infrared region and emissivity reaches 95–98% in the atmospheric transmission window. In three days of outdoor testing, the P-FAPE6 film showed an average temperature drop of 5.72–8.52 °C compared to ambient temperature. Importantly, the water contact angle of the P-FAPE6 film is 160°, and the self-cleaning effect prevents the film surface from dirt contamination or wetting in long-term outdoor use. The P-FAPE6 film also demonstrated long-term stability, a V-0 rating for fire resistance in the UL-94 combustion test, which is promising in applications for cooling building facades, outdoor tents, and vehicle sunshades.
研究领域:
材料科学
·
环境科学
·
建筑技术
✓ 已验证
产品关联
DOI
高影响因子
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
危险品化学品经营许可证（带存储）