CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Mingjie Ye,Mingming Li,Xiaoyu Qin,Minmin Gao,Jie Liu,Xibin Yu
In this work, a novel yellow near-infrared (NIR) reflective pigment based on the formula of Sb x WO 3 was developed by high temperature solid-state method at 700–900 °C. The formation of Sb x WO 3 was confirmed by XRD analysis, and the synthesized pigments are orthorhombic phase with high near infrared reflectivity (84.69%–87.28%). The acid/alkali resistance studies reveal that the color difference ΔE * of the pigments before and after soaking was less than 5, and the as prepared pigments are chemically stable under the atrocious weather. In addition, the synthetic pigments are bright yellowish green (L* = 92.1–92.9, a* = -4.9–4.1, b* = 35.0–37.0). In the heat insulation performance test, the indoor temperature with the Sb x WO 3 heat insulation coating is 3.1 °C lower than that without heat insulation coating. In summary, the as prepared Sb x WO 3 pigment has the advantages of high solar reflectivity and less toxic elements, making this new environmentally friendly energy-saving yellow pigment used as a colorant for building exterior coating formulations to reduce heat accumulation and cooling energy consumption.
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
·
2023
·
IF 5.2
Wei Wang,Le Pang,Ming Jiang,Yaping Zhu,Fan Wang,Jingwen Sun,Huimin Qi
In this study, we investigated the tunable porous structure of SiCN(O)-derived ceramic aerogels by changing the molecular structure of the polysilazanes from linear to branched. We also studied the effect of molecular structure on the thermal insulation properties of ceramic aerogels. As the percentage of branched molecular structure in the polysilazane precursor increased, the internal microscopic pore structure of the aerogels changed from macroporous to mesoporous. The specific surface areas and pore volumes of the ceramic aerogels prepared with different precursors increased after pyrolysis at 1000 °C, ranging from 3.7 to 255.9 m 2 /g and 0.01–0.36 cm 3 /g, respectively. The corresponding thermal conductivities increased slightly as the aerogels contracted after pyrolysis. The low thermal conductivity (0.046 W/(m·K) at minimum) can be attributed to the decrease in pore size caused by adjusting the precursor structure, which limits the thermal conduction of gas in the porous aerogel 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
CARBOHYDRATE POLYMERS
·
2018
·
IF 5.158
Xuesong Ge,Youna Shan,Lin Wu,Xindong Mu,Hui Peng,Yijun Jiang
Composite aerogels with excellent mechanical properties were prepared by using carboxymethyl cellulose (CMC) as raw materials, 2D graphene oxide (GO) nanosheets as reinforcement, boric acid (BA) as cross-linker. By controlling the heat transfer rate, composite aerogels with isotropy and anisotropy structure were prepared, the mechanical and heat insulation properties were studied. The isotropy composite aerogel had compression strength of 110 kPa at 60% compression, which was 5 times of the axial and 14 times of the radial of anisotropy structure composite aerogels, and thermal conductivity was also lower than those of two directions of anisotropy composite aerogel. Besides, the mechanical properties of isotropy composite aerogels increased with the increase of GO content. When GO content was up to 5 wt%, the compressive strength and Young’s modulus of composite aerogels reached 349 kPa and 1029 kPa, which were 1.6 and 4.5 times that of CMC aerogels, respectively.
研究领域:
材料科学
·
纳米技术
✓ 已验证
DOI
PubMed
高影响因子
POLYMER
·
2025
·
IF 4.5
Wentao Wang,Rui Zhang,Jing Bai,Jing Peng,Wu Mang
Large-scale applications of versatile cellulose cryogels have received much concern but remains challenging due to their complicated post-treatment and brittleness nature. A organic solvent-free and mechanical-assisted strategy was proposed here to effectively exfoliate cellulose microfibrils. The flexible, ultralight, elastic, and multi-scale cellulose hybrid cryogels were manufactured by adding tiny dosage of polyamide-epichlorohydrin (PAE), which was employed here as flexible and crosslinked skeleton. Undergoing freeze drying and vacuum heating, a series of CMFs/PAEx cryogels were successfully acquired with superior mechanical and thermal insulation performances. CMFs/PAE0.5 cryogel achieved 2.5 folds stress at 80% compressive strain and 2.4 folds elastic recovery with respect to CMFs/PAE0. The hydrophobic modification of the CMFs/PAEx cryogels were readily accessible by dip-coating of palm wax and endowed these cryogels with good water repellency (contact angle of ∼128 o ). Overall, the proposed strategy open up novel perspectives for the design of cellulose cryogels and beyond.
研究领域:
材料科学
·
生物材料工程
✓ 已验证
DOI
高影响因子
CONSTRUCTION AND BUILDING MATERIALS
·
2024
·
IF 7.4
Tianyi Hang,Luyao Ding,Guohao Lv,Jiahui Shen,Jiajia Zheng,Xiping Li,Shaohua Jiang,Yiming Chen
With the ongoing advancement of society, the populace’s needs for goods are progressively evolving from essential to comfy. Within the construction sector, the demands for building materials with exceptional sound absorption and thermal insulation capabilities are becoming increasingly expected by consumers. Herein, the melamine foam (MF) and carboxymethyl cellulose (CMC) were combined through a facile dip-coating method. Benefitting from the unique three-dimensional porous structure and the folded pore walls caused by CMC, the composite foam with thin-slice structure exhibited a high sound absorption capacity with a noise reduction coefficient of 0.424 (thickness = 20 mm). In particular, compared to the unmodified MF, the sound absorption performance of the composite foam was increased by approximately 94.3 % at 500 Hz and 211.2 % at 1000 Hz. Furthermore, it also demonstrated outstanding thermal insulation ability with low thermal conductivity of 0.0319 W/mK and thermal diffusivity of 0.855 mm 2 /s. When placed on a heating platform of 145 °C, the temperature difference between the upper and lower surfaces of the composite foam reached an impressive 105.1 °C. Based on these advantages, this high-performance composite foam possesses great potential for applications in engineering, construction, noise reduction, and personal protection.
研究领域:
材料科学
·
建筑工程
✓ 已验证
DOI
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2024
·
IF 3.5
Hengchang Wang,Jie Xu,Mingyue Wei,Xiaoying Feng,Jiamin Wu,Ping Zhang,Feng Gao
Ceramic fibers are potential lightweight materials for high-temperature insulation due to their excellent high-temperature stability and low thermal conductivity. However, the grain growth at high temperatures leads to the loss of flexibility and decreases in the thermal insulation performances of the ceramic fibers. Herein, we prepared flexible (La 0.2 Nd 0.2 Sm 0.2 Gd 0.2 Yb 0.2 ) 2 Zr 2 O 7 (LNSGY) high-entropy ceramic nanofibrous membranes using polyacetylacetone rare-earth zirconium precursors by electrospinning method. According to the XRD and TEM analyses, the LNSGY nanofibrous membranes exhibited dual phases of defective fluorite and ordered pyrochlore structures. The grain size of the LNSGY fibers increased from 15.4 to 40.8 nm at heat treatments increasing from 800 to 1200°C; the slow grain growth in high-entropy ceramic nanofibrous membranes contributed to the good flexibility. The fiber morphology was continuous and well distributed with diameters less than 500 nm. The thermal conductivity at room temperature was 0.0339 W/(m K). In addition, the high-entropy ceramic nanofibrous membranes exhibited tensile strength and thermal stability at high temperatures. These performances provide further applications for high-entropy ceramic nanofibrous membranes as high-temperature insulation materials.
研究领域:
材料科学
·
热能工程
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Yang Hu,Jihao Tao,Yinan Nie,Chenbo He,Qiaolin Si,Chunlei Sun,Xin Zhao,Guihua Tang
Due to the fragile characteristic of silica aerogel, it is difficult to achieve large-scale preparation of large-sized and multi-shaped silica aerogels through the simple and low-cost ambient drying method to meet the needs of various application fields. In this study, we present a novel approach that combines ambient and freeze drying methods to synthesize fiber composite silica aerogels with excellent formability and thermal insulation performance. Rock-wool fibers and TiO 2 /ZrO 2 fibers produced by electrostatic spinning were employed to fabricate composite in various shapes. The rock-wool fiber composite aerogel exhibits high thermal insulation performance with a thermal conductivity of 0.0283 W m −1 K −1 at room temperature. The TiO 2 /ZrO 2 fiber composite aerogel demonstrates a high specific surface area of 792.26 m 2 g −1 and outstanding temperature resistance up to 800 °C. The Mie scattering simulations demonstrate that the TiO 2 /ZrO 2 composite fibers exhibit high radiative shielding properties at high temperature and the measured thermal conductivity of the TiO 2 /ZrO 2 fiber composite aerogel powder is 0.0538 W m −1 K −1 at 800 °C in an argon atmosphere. This study introduces a novel method for integrating silica aerogel with various types of fibers, expanding the potential applications of ambient drying aerogels.
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
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2024
·
IF 5.8
Menghong Li,Hong Tang,Jiawei Li,Jiao Han,Yiming Zeng,Ping Yang,Yuanbing Li,Shiqi Li,Xinyu Fan
In this study, a two-step method combining the direct foaming process with the control of solid content and heat treatment temperature was employed to prepare ZrP 2 O 7 -CePO 4 composite porous materials with varying porosities. The results indicate that an increase in solid content and heat treatment temperature leads to a reduction in porosity and average pore size while simultaneously improving the mechanical properties. The porosities, compressive strengths , thermal conductivities , ε and Tanδ ranged from 63.2 to 85.3 vol%, 19.43 to 0.99 MPa, 0.089 to 0.088 W/(m·K), 1.64 to 2.72, and 0.88 × 10 −3 to 1.99 × 10 −3 , respectively. Electromagnetic simulations have validated that ZrP 2 O 7 -CePO 4 composite porous ceramics , when used as the core layer material for A-sandwich antenna radomes, exhibit excellent transmittance properties. This suggests the potential application of these materials for supersonic aircraft antenna radomes.
研究领域:
材料科学
·
航空航天工程
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Yang Haoyu,Zhang Xiaoqi,Zhang Weiwei,Song Changyuan,He Suqin,Huang Miaoming,Liu Hao,Xu Wanlin,Zhu Chengshen,Liu Wentao
Lightweight, friction-resistant polyamide foam with exceptional mechanical properties represents a novel material with significant potential. In this study, we synthesized a series of high-toughness, bio-based polyamide materials characterized by low melting points, extensive processing temperature ranges, and robust low-temperature resistance. This was achieved through the copolymerization of bio-based components, including glutaraldehyde, sebacic acid, and caprolactam. Subsequent foaming using supercritical CO 2 was performed, substantially reducing foaming conditions and broadening the foaming range. Optimal foaming conditions were simulated, resulting in the production of various polyamide foams with differing foaming multiplicities, all exhibiting impressive tensile strength, compressive strength, low-temperature resistance, and friction resistance. Additionally, this study simulated the thermal insulation performance of polyamide foams across a wide array of practical working conditions. The results demonstrated that these foams possess low thermal conductivity and excel in actual thermal insulation performance. Therefore, they present significant promise as energy-saving and environmentally friendly materials in applications such as building thermal insulation, electrical insulation, and protective systems. As a sustainable solution, these bio-based polyamide foams hold great potential for advancing energy efficiency in construction, thermal management of electrical appliances, and protective applications.
研究领域:
材料科学
·
环境科学
·
能源工程
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Ruiying Zhai,Yijie Yang,Peilin Lei,Jiahao Lu,Sisi Chen,Xiaoqi Sun
In this article, a green pigment Bi 1.95-x Pr x W 0.05 MoO 6+δ (x = 0.1–0.5) co-doped with Pr and W was developed using high temperature solid-phase synthesis method. The microstructure, color performance, and optical characteristics of the novel pigment was analyzed using x-ray diffraction instrument (XRD), field-emission scanning electron microscopy (FESEM), L∗ a∗ b∗ color date, and ultraviolet–visible–near infrared light spectrophotometer. The results indicate that all the samples possess a monoclinic structure, characterized by the space group P21/c(14). Compared to Bi 2-x Pr x MoO 6+δ doped solely with Pr 6 O 11 , the Pr/W co-doped Bi 2 MoO 6 pigment demonstrates superior green coloration. The solar reflectance in the near-infrared region of all pigment samples exceeds 80 %, highest value reaches 92.82 %. In thermal insulation tests, the temperature difference between the Bi 1.95-x Pr x W 0.05 MoO 6+δ pigment coating and a blank galvanized sheet reaches up to 10.3 °C after 60 min under infrared lamp irradiation. The color difference Δ E∗ of the pigment powder after immersion in acid and alkali solution and high-temperature calcination are less than 5, indicating good chemical stabilities in acidic, alkaline and high-temperature environments. To our knowledge, Bi 1.95-x Pr x W 0.05 MoO 6+δ has the highest reflectivity among green pigments without toxic metals.
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
RARE METALS
·
2025
·
IF 11
Deng Zhe-Zhe,Peng Ying,Xie Yong-Shuai,Zeng Cheng,Li Xin-Hao,Li Jia,Zhu Lu-Yi,Liu Xiao-Long
Thorium dioxide (ThO 2 ) fibers exhibit exceptional structural stability, low density and superior flexibility, coupled with a remarkably high melting point, positioning them as promising candidates for thermal protection applications. Additionally, their commendable secondary processing characteristics enable the development of diverse composite materials when integrated with other materials, significantly broadening the potential utilization of ThO 2 materials and thorium resources in industrial fields. In this work, the ThO 2 fiber was fabricated by the sol–gel precursor method, and the precursor with good spinnability and excellent stability was synthesized for the first time. The ThO 2 fiber with a mean diameter of 868 nm is both highly flexible and strong (max. tensile strength 2.21 MPa), capable of bending freely across a wide temperature range from − 196 °C (in liquid nitrogen) to 1200 °C. Meanwhile, it exhibits excellent temperature stability and heat insulation properties. The ThO 2 nanofiber membranes with layered structure have low density (32–37 mg·cm −3 ), low thermal conductivity (27.3–30.1 mW·m −1 ·K −1 @25 °C). The ThO 2 nanofiber membranes with 15 mm thickness can reduce the temperature from 1200 to 282 °C and maintain a high aspect ratio and bendability after 1200 °C@90 min. The results show that the ThO 2 fiber can be used as a new kind of high-temperature resistant material. Graphical abstract
研究领域:
材料科学
·
核能工程
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Lei Han,Ruiling Du,Yu Chen,Ling Zhang,Huifang Wang,Haijun Zhang,Shaowei Zhang
Porous high-entropy transition metal compounds, an important type of ultra-high temperature material, have attracted increasing attention in the applications of extreme environments due to their low density, good thermal insulation and stable chemical properties. A robust, flame-retardant and high-temperature resistant high-entropy carbonitride (Ti 1/5 V 1/5 Mo 1/5 Nb 1/5 Ta 1/5 )(C 0.55 N 0.45 ) (HECN) porous ceramic was synthesized and thoroughly characterized. It exhibited a porosity of 93.5 %, a compressive strength of 1.3 MPa and a good high-temperature stability up to 1673 K, which, along with its outstanding fire-retardancy, and low thermal conductivity (as low as 0.150 W m −1 K −1 at 298 K), made it a good candidate material for thermal insulation applications in ultra-high temperature environments. Moreover, the Density functional theory (DFT) calculations predict that the [N]/([C]+[N]) ratio in HECN foam affects its lattice thermal conductivity which is decreased by 67 % upon increasing the ratio from 0 to 1/2.
研究领域:
材料科学
·
热力学
·
计算化学
✓ 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）