CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Meiqi Zhang,Yijie Yang,Luo Feng,Xiaoqi Sun
Near infrared reflective inorganic pigment YIn 1-x-y Mn y Fe x O 3 (x/y = 0.1–0.5) was prepared by solid state reaction. The X-ray diffraction analysis and CIE1976 L*a*b* colorimetric analysis reveal that the main phase of the sample is changed from YInO 3 phase to YFeO 3 phase and the color of the sample is changed from blue to black (x ≥ 0.4) with the increase of iron content. The brightness value of black pigment ranges from 23.27 to 32.12. When In 3+ is replaced by Fe 3+ and Mn 3+ , the band gap of the black sample is decreased from 1.73eV to 1.39eV. The near-infrared reflectance (R) and near-infrared solar reflectance (R*) of the sample reach the maximum when x = 0.4 and y = 0.1, which are 77.82% and 53.44%, respectively. YIn 1-x-y Mn y Fe x O 3 (x = 0.4–0.5, y = 0.1–0.5) black samples have higher near infrared reflectivity than common commercial black pigments. In the thermal insulation study, under the condition of infrared irradiation for 90 min, the internal air temperature difference between the iron car model coated with YIn 0.5 Mn 0.1 Fe 0.4 O 3 pigment and the iron car model coated with commercial iron black pigment can reach 7 °C. YIn 0.5 Mn 0.1 Fe 0.4 O 3 black pigment was soaked in 5% acid-alkali solution for 24 h, the chromaticity was almost unchanged before and after immersion, indicating that the sample has good chemical stability. The above properties show the potential of synthetic black pigments in the field of energy conservation.
研究领域:
材料科学
·
化学
✓ 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
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
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
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
ACS Sustainable Chemistry & Engineering
·
2021
·
IF 8.198
Wenwu Zhou,Yue Liu,Qi Sun,Jianyong Ye,Long Chen,Jia Wang,Guiqin Li,He Lin,Yuanqing Ye,Weifan Chen
A new series of orange highly near-infrared reflective pigments based on Fe-doped La2W2O9 were effectively fabricated via solution combustion synthesis. The acquired pigment powders were characterized by powder X-ray diffraction, scanning electron microscopy, energy dispersive spectroscopy, X-ray photoelectron spectroscopy, ultraviolet–visible–near-infrared spectrophotometry, and CIE 1976 L*a*b* color scales. Then, the energy consumption of the air-conditioning system was simulated based on EnergyPlus software. The results showed that the doping of Fe3+ ions will change the color of the pigment from white to orange. Meanwhile, the band gaps of La2W1.85Fe0.15O9-δ and La2W1.8Fe0.2O9-δ shifted from 3.71 to 3.07 eV and 2.96 eV, respectively. The typical La2W1.85Fe0.15O9-δ pigment powders showed the highest near-infrared reflectance of 89.25% between 700 and 2500 nm and impressive color (L* = 74.20, a* = 22.69, and c* = 22.42). The simulation results illustrated that the homeowner could save $7.32 per month by coating the walls and roofs of the building with the energy-saving paint composed of La2W1.8Fe0.2O9-δ. Excellent chemical stability and high near-infrared reflectance made the synthesized pigments a potential candidate for energy-saving coatings.
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
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
·
2024
·
IF 5.1
Siyu Huang,Yang Yang,Jun Li,Linyutong Zhu,Qiu Zhang,Liying Pan,Xueyue Lv,Guangdong Zhao
Ceramic aerogels exhibit an extremely high porosity, low weight, and exceptionally low thermal conductivity, making them suitable as insulating materials for use in challenging environments. The widespread application of conventional ceramic aerogels is typically constrained by the fragile nature of the material and its high-temperature infrared radiation transparency. Here, we successfully prepared SiTiOC/PS/TiO 2 hybrid aerogels by effectively synthesizing them using polyvinyl alcohol (PVA) as the carbon skeleton and reinforcing them with polystyrene microspheres (PS) and PAN nanofibers loaded with TiO 2 (TiO 2 /PAN NFs), and TiO 2 /PAN NFs as shading material. This was achieved through a combination of the polymer precursor transformation method, sol-gel method, and techniques such as freeze-drying and electrostatic spinning. The findings indicated that the fabricated SiTiOC/PS/TiO 2 hybrid aerogels exhibited a lightweight structure, exceptionally high infrared reflectivity, remarkably low thermal conductivity, and outstanding mechanical characteristics. The successful synthesis of the SiTiOC/PS/TiO 2 hybrid aerogels offers a novel approach for advancing the production of various thermal insulation materials.
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
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
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2025
·
IF 6.2
Qiyong Deng,Liyan Xue,Mengtong Ma,Jinming Du,Haiying Xin,Heng Chen,Minzhong Huang,Fan Yang
In high temperature industrial applications, aerospace and building energy efficiency sectors, the thermal protection provided by insulation materials under extreme environmental conditions is critical. This study successfully prepared a novel rare earth high entropy molybdate (Y 0.2 La 0.2 Er 0.2 Ho 0.2 Tm 0.2 ) 6 MoO 12 ceramic nanofibers ((5RE) 6 MoO 12 ) whit high near-infrared reflectivity and low thermal conductivity by electrostatic spinning method. The spectral reflectance studies revealed that (5RE) 6 MoO 12 nanofibers exhibit a high reflectance of 99.2 % in the near-infrared wavelength range. The high entropy induced lattice distortion effect enhances phonon scattering, resulting in the thermal conductivity of (5RE) 6 MoO 12 nanofiber-based ceramics (0.0689 W/m·K, 25℃) being lower than that of single-phase Y 6 MoO 12 nanofiber-based ceramics (0.0832 W/m·K, 25℃). Additionally, upon heat treatment between 800 and 1100℃, the (5RE) 6 MoO 12 fibers demonstrated slower grain growth and better fiber structure retention than Y 6 MoO 12 fibers attributed to the hysteretic diffusion effect of high entropy, which allowed (5RE) 6 MoO 12 ceramic nanofibers to exhibit better thermal stability. These outstanding properties make high-entropy ceramic nanofibers a promising candidate for application in the field of thermal insulation materials.
研究领域:
材料科学
·
热能工程
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Kai Lv,Xu Liang,Liangmiao Zhang,Zongtao Zhang,Yanfeng Gao
Solar thermal energy regulation is important for sustainable development, comfortable housing, and living. Black compounds are usually considered as an absorber of solar heat. This work reports a series of black near-infrared reflective pigments, Ca 2-y Mg y Mn(1) 1-x Mn(2) x O 4 (x = 0–1, y = 0–0.5), which show strong near-infrared (NIR) reflectivity. Comprehensive analyses were carried out to characterize the obtained pigments including X-ray diffraction, scanning electron microscopy, Raman spectroscopy, and UV–Vis–NIR spectrophotometry. Through the substitution of MnO 2 with Mn 2 O 3 , NIR solar reflectance of the black pigment can be enhanced by 13%, which might be mainly attributed to differences in particle size and lattice parameters. Meanwhile, through Mg doping, the obtained pigment Ca 1.8 Mg 0.2 MnO 4 shows excellent color performances (L* = 43, a* = 0.36, b* = −0.37) and NIR solar reflectance (R*, ∼60%). EnergyPlus simulation results show that for a warm city (Haikou), using the Ca 1.8 Mg 0.2 MnO 4 coating (L* = 25, R* = 51%) can reduce annual cooling energy consumption by 21%.
研究领域:
材料科学
·
能源技术
✓ 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
危险品化学品经营许可证（带存储）