CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Longfei Li,Yunguang Yin,Chenyu Mi,Youmei Wang,Yongshuai Xie,Luyi Zhu,Xinqiang Wang,Benxue Liu,Guanghui Zhang
In this paper, DyTaO 4 fiber membrane and fiber sponge were successfully prepared by electrospinning for the first time from new precursors of Dy and Ta. DyTaO 4 fibers were crystallized at only 430 °C from amorphous precursor fibers and without phase transformation up to 1600 °C. The fiber membranes have tensile strength (0.75 ± 0.20 MPa @ 800 °C) and flexibility, exhibits excellent flexural and compressive resilience properties, which can replace thermal insulation layer in firefighting suits and exhibit excellent thermal insulation properties and ablation resistance. The fiber sponge with the density of about 65 mg·cm −3 has low thermal conductivity of 23.5 and 86.4 mW·m −1 ·K −1 at room temperature and 1000 °C, respectively. Butane gun flame as heat source, the sample with the thickness of 25 mm can reduce the temperature from 1300 °C to 150 °C. After 600 s, the surface hardness of the fiber sponges was increased, but the sample still maintained excellent flexibility. This work provides a new way for rare-earth tantalates to meet high-temperature flexible applications by fully utilizing their advantages
研究领域:
材料科学
·
热力学工程
✓ 已验证
产品关联
DOI
高影响因子
Advanced Science
·
2024
·
IF 14.3
Shanying Sui,Huafeng Quan,Jingxing Wang,Yufang Lu,Yufan Yang,Yuhan Sheng,Zhifang Sun,Yi Zhang
Advanced aerogels hold immense potential in thermal insulation. However, achieving high environmental adaptability aerogel insulators with elasticity, hydrophobicity, flame-retardancy, and low temperature tolerance remains a significant challenge. Inspired by a “brick-mortar-binder” biomimetic texture, a layered double hydroxide/carboxylated cellulose nanofibers/Si–O–Si (LCS) hybrid aerogel is developed by bottom-up freeze-drying. Owing to the distinct building blocks and organized structure, as-prepared LCS hybrid aerogel exhibits impressive mechanical elasticity, cycling stability at an extremely low temperature (-196 °C), hydrophobicity, and flame-retardancy (LOI = 44.6%, UL-94: V-0). Additionally, the incorporation of layered double hydroxide effectively improves the thermal insulation property (thermal conductivity = 0.0296 W·m −1 ·K −1 ). These distinctive features make the LCS hybrid aerogel highly promising for thermal management applications in extreme conditions, such as in pipelines for transporting liquid nitrogen and liquefied natural gas.
研究领域:
材料科学
·
纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Nano Materials
·
2024
·
IF 5.3
Dehua Ma,Yifan Wang,Lin Wang,Ying Peng,Yunguang Yin,Shanyue Hou,Luyi Zhu,Xinqiang Wang,Benxue Liu,Guanghui Zhang,Yongshuai Xie,Dong Xu
Ultralow-density (35–60 mg·cm–3) Yb2O3 nanofibrous membranes (YbFMs) with a multilayer structure were successfully prepared for the first time using Yb-acetylacetone coordination polymer as a precursor. Thanks to the high ceramic yield (62.1%) and excellent spinnability of the precursor, the YbFMs exhibited outstanding flexibility, which does not cause damage even when bent or knotted. The tensile strength of the YbFMs was 1.69 MPa, and the maximum elongation could reach 33%. Notably, the YbFMs exhibited robust fatigue resistance, retaining 87.2% of the initial stress even after 500 buckling cycles and preserving 84.75% of the initial stress in compression resilience. Moreover, the YbFMs exhibited flexibility and compressive performance in the temperature range of −196–1350 °C. The thermal conductivity of the YbFMs was 28.9–34.6 mW·m–1·K–1. At a hot surface temperature of 1350 °C, the 6 mm thick YbFMs could reduce the back temperature by about 1070 °C. Thus, YbFMs are expected to be a flexible insulation material at extremely high temperatures.
研究领域:
材料科学
·
能源科学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Jia Chen,Zhilin Chen,Xianbo Hou,Liming Chen
Efficient thermal insulators that can maintain their efficacy at extreme temperatures are in pressing demand, particularly in fields such as energy saving, aerospace, and sophisticated equipment. Herein, a novel and facile polymerization-regulated optimal strategy is adapted to realize the comprehensive performance of polyimide (PI) aerogel membranes with mechanical robustness, high flexibility, hydrophobicity, light transmittance, and efficient thermal insulation. Benefiting from the hydrolysis of monomers and chemical imidization reaction process verified by a thermo-chemo-mechanically coupled theoretical model, the viscosity of precursors, shrinkage rate, and microstructure of aerogels are precisely controlled, leading to a low thermal conductivity range of 0.023–0.044 W/(m·K). The fabricated PI aerogel membranes, which undergo a remarkable transformation from their initial brittle and opaque nature to a state of high flexibility and transparency, exhibit a 3.0 times increase in tensile strength (4.6 MPa) and a 8.4 times improvement in elongation at break (20.6%) over previous studies while demonstrating an exceptional light transmittance of 92.5% across a wide spectral range from 500 to 2500 nm. Additionally, the PI aerogel membranes possess superior mechanical properties and a wide temperature resistance range extending from −196 to 300 °C. These flexible PI aerogel membranes can be effectively adjusted to meet the practical application of a circular ring solar thermal collector, which displayed a high solar heat collection temperature of 135 °C at a thickness of 0.5 mm. The coordination between the thermophysical properties and mechanical properties of the PI aerogel membranes in this work holds great promise for application requirements of thermal insulators in optical elements under harsh environments.
研究领域:
材料科学
·
能源工程
·
航空航天工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
·
2024
·
IF 4.1
Tuodong Xiong,Wanxiong Yong,Na Chen,Guodong Fu
Photochromic materials have recently attracted widespread attention in the research of smart windows because they can function without additional devices. In this study, an innovative photochromic thermal insulating hybrid film based on a polyurethane matrix was prepared via a one-pot method, incorporating phosphotungstic acid. The film demonstrates excellent transparency, good mechanical strength, and a significant modulation of the solar spectrum, transitioning from colorless to dark blue under sunlight without the need for additional electron donors. This photochromic behavior is reversible and reproducible without degradation, resulting in a transmittance variation of up to 71 % at 550 nm, which is the most sensitive to the human eye, and more than 50 % modulating performance in 1800 ∼ 2500 nm. In addition, thermal insulation experiments proved that the smart window device prepared by the film could achieve a reduction of 9.3 °C under daylight. Overall, the photochromic films prepared using the one-pot method show good performance involving mechanical strength, efficient photochromic response, broad spectral range modulation, high coloring efficiency and cycling stability, and have promising applications in energy-saving buildings, anti-counterfeiting and smart displays.
研究领域:
材料科学
·
能源工程
·
光学工程
✓ 已验证
产品关联
DOI
高影响因子
COMPOSITES PART B-ENGINEERING
·
2024
·
IF 12.7
He Huang,Yiwu Pan,Hebing Wang,Can Wu,Jinliang Li,Xiangyu Jin,Wenbo Han,Changqing Hong,Xinghong Zhang
Lightweight ablative thermal insulation composites are attractive for thermal protection in extremely harsh environments. However, the flexibility called for in applications such as morphing aerocraft is yet to be satisfied, especially with toughness and ablative resistance. Herein, for the first time, a bio-inspired tendon-like buffer of silicone rubber was employed to gradiently connect the inorganic quartz fiber and organic phenolic resin aerogel in the composite to develop flexible and tough ablative thermal insulator. The composite exhibited reversible compressibility and bendability, wherein the stress was 1.46 MPa and 0.47 MPa at 60 % compressive strain and 9 % bending strain, respectively. Additionally, the tensile strength was up to 2.39 MPa. It was self-ceramifiable at high temperatures, resulting in the ablation rate as low as 0.002 mm/s, which is favorable for ablation resistance and thermal insulation. We investigated and illustrated the ceramizing mechanism in detail. The outstanding hydrophobicity with the water contact angle of 138.8° is profit to the safety and durability of thermal insulators. The multi-functional composite opens up a new path to develop deformable thermal-protection materials with flexibility, roughness, hydrophobicity, self-ceramization, and thermal insulation for flexible thermal protection in harsh environments.
研究领域:
材料科学
·
生物启发设计
✓ 已验证
产品关联
DOI
高影响因子
Materials Research Express
·
2021
·Vol. 8
·期 2
·025004
·
IF 1.62
Mengyuan Li,Zhiyang Zhao,Xianli Fang,Zefeng Zhang,Min Deng
CsxWO3-ZnO-SiO2 smart coatings were proposed to achieve multiple functions, such as thermal insulation, anti-dust, anti-fogging and blocking harmful ultraviolet light, etc. The transparent hydrophobic hybrid resins were prepared from methyltriethoxysilane (MTES) and SiO2 sol, which was used as the substrate of the composite coating. The CsxWO3 is served as the near-infrared (NIR) absorber, and the ZnO is functioned as the ultraviolet (UV) blocking agent. Coatings with different ratios of CsxWO3 and ZnO were successfully prepared by co-blending with nano-SiO2 resin. The morphology, microstructure, surface composition, hydrophobicity, thermal stability, anti-dust and optical property of the composite coatings were investigated comprehensively. The transmittance of C10Z10 (CsxWO3 10%, ZnO 10%, nano-SiO2 resin 80%) coating at 370 nm is 2.3%, and the value of Solar Energy Transmittance Selectivity (SETS) is 0.665, which exhibits excellent NIR shielding ability. Compared with nano-SiO2 resin coating, the thermal insulation temperature difference can reach 7.0 °C. The C10Z10 coating showed good durability in the twenty times anti-dust repeated tests and the efficiency could maintain 70.3% after the repeating tests. The coating showed excellent sustainability after a 45-day outdoor exposure experiment and a 240 h of artificial accelerated aging experiment. Thus, the proposed CsxWO3-ZnO-SiO2 coatings are promising for outdoor smart windows.
研究领域:
材料科学
·
能源工程
✓ 已验证
DOI
高影响因子
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
·
2020
·
IF 6.444
Jundong Zhu,Fuxing Zhao,Renjie Xiong,Tangping Peng,Yinyi Ma,Jiang Hu,Le Xie,Chongwen Jiang
The advanced thermal management material with high mechanical strength and low thermal conductivity have an extremely important position in thermal insulation. Herein, we successfully prepared a green sustainable and low-cost composite aerogel with attapulgite and gelatin as the main components, and then obtained by chemical crosslinking and freeze-drying. Dopamine was used to functionalize attapulgite to increase interface compatibility between inorganic phase and gelatin molecules. The results show that the as-prepared attapulgite/gelatin composite aerogel have lower bulk density (ρ = 0.036–0.062 g cm −3 ), compression modulus up to 3.92 MPa, lower thermal insulation (λ = 34.28–35.29 mW/m K) and an excellent fire resistance (total heat release rate (THR) to 5.4 J kg −1 ), which mainly attributed to the improvement of the physical properties of the composite aerogel and the construction of the micro/nano structure by the attapulgite with high aspect ratio and high specific surface area embedded in the gelatin skeleton.
研究领域:
材料科学
·
热管理工程
✓ 已验证
DOI
高影响因子
COMPOSITES COMMUNICATIONS
·
2024
·
IF 6.5
Huabin Hu,Jing Wang,Caiyun Li,Jun Xu,Lei Li
In extreme environments, thermal insulating materials must exhibit superior mechanical properties, be waterproof, and possess thermal stability to ensure optimal protection for both the human body and equipment. However, most existing thermal insulating materials suffer from limited thermal insulation performance, moisture absorption, inferior mechanical properties, and suboptimal thermal stability, thereby limiting their ability to protect against extreme conditions. In this study, the combination of electrospinning and freeze-drying technology was used to prepare polyimide aerogels with a rigid-flexible coupling structure. The prepared polyimide micro/nanofibrous aerogels demonstrated ultralight performance (6.5 mg cm −3 ), significant compression performance, and the ability to recover to their initial state under 80 % strain. After 1000 compression cycles at 60 % strain, only 7.2 % plastic deformation was observed, indicating excellent fatigue resistance. The synergistic effect of the rigid-flexible coupling endowed the aerogel with superior thermal insulation (26.9 mW m −1 K −1 ), and high-temperature resistance (441.8 °C). Furthermore, surface modification with water-repellent agents imbued the aerogels with enhanced hydrophobicity, making them suitable for use in extreme environments such as rainwater. This work offers new insights for the design and development of high-performance insulation materials in extreme conditions.
研究领域:
材料科学
·
极端环境工程
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Yang Yang,Yiming Yang,Li Ye,Tong Zhao,Hao Li
Applications of aerogels are commonly restricted by their complicated preparation route, high energy cost, brittleness and poor mechanical properties. Herein, a facile synthesis route for mechanical robust polyurethane (PU) modified phenolic resin (PF) aerogel was developed. The aerogel was prepared via polymerization of PU and phenolic resin (PF) followed by direct ambient pressure drying, sub-10 nm scale co-continuous phase structure was realized via control of kinetics of sol–gel reaction. The regulation of phase structure significantly enhanced mechanical properties of aerogels, which showed compressive strength and modulus of 29 MPa and 112 MPa, respectively, at 60 % strain without notable collapse. Furthermore, these aerogels showed excellent thermal insulation properties at both room temperature and high temperature. They exhibited superior dynamic ablative thermal protection at 1200℃ in oxygen-acetylene ablation test. This facile, inexpensive, environment-friendly methodology for aerogel preparation expands the application scope of aerogels in the field of thermal insulation under harsh environments.
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
Journal of Building Engineering
·
2024
·
IF 6.7
Zhi Li,Shengjie Yao,Guichao Wang,Chuangang Fan,Xiaoxu Wu
This study investigates the effects of various components on the performance of aerogel-phosphogypsum (APG) thermal insulation mortar. This study investigates the effects of various components on the performance of aerogel-phosphogypsum (APG) thermal insulation mortar, with a special focus on optimizing the composition to enhance mechanical properties. The parametric range explored included phosphogypsum content from 10 to 30 wt%, hollow glass microspheres (HGS) from 5 to 15 wt%, and aerogel slurry from 40 to 80 wt%. Our findings reveal that the optimal composition, which provided the best balance between thermal insulation and mechanical strength, consisted of 20 wt% phosphogypsum, 10 wt% HGS, and 60 wt% aerogel slurry. Notably, the introduction of 0.14 % hydroxypropyl methylcellulose (HPMC) and 1.89 % re-dispersible polymer powder (RPP) significantly enhanced the compressive strength of the mortars. Specifically, compressive strength increased from an initial 0.05 MPa–0.27 MPa post-enhancement with HPMC and RPP. This research provides a detailed understanding of how individual components influence the formulation of APG and offers insights for optimizing the overall performance of aerogel-phosphogypsum composites, contributing to advancements in sustainable building materials.
研究领域:
建筑材料
·
可持续发展
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
Gels
·
2024
·Vol. 10
·期 4
·266
·
IF 5
Yuxiang Du,Pengjie Jiang,Xin Yang,Rui Fu,Lipeng Liu,Changqing Miao,Yaxiong Wang,Huazheng Sai
Aerogel fibers, characterized by their ultra-low density and ultra-low thermal conductivity, are an ideal candidate for personal thermal management as they hold the potential to effectively reduce the energy consumption of room heating and significantly contribute to energy conservation. However, most aerogel fibers have weak mechanical properties or require complex manufacturing processes. In this study, simple continuous silk fibroin–agarose composite aerogel fibers (SCAFs) were prepared by mixing agarose with silk fibroin through wet spinning and rapid gelation, followed by solvent replacement and supercritical carbon dioxide treatment. Among them, the rapid gelation of the SCAFs was achieved using agarose physical methods with heat-reversible gel properties, simplifying the preparation process. Hydrophobic silk fibroin–agarose composite aerogel fibers (HSCAFs) were prepared using a simple chemical vapor deposition (CVD) method. After CVD, the HSCAFs’ gel skeletons were uniformly coated with a silica layer containing methyl groups, endowing them with outstanding radial elasticity. Moreover, the HSCAFs exhibited low density (≤0.153 g/cm3), a large specific surface area (≥254.0 m2/g), high porosity (91.1–94.7%), and excellent hydrophobicity (a water contact angle of 136.8°). More importantly, they showed excellent thermal insulation performance in low-temperature (−60 °C) or high-temperature (140 °C) environments. The designed HSCAFs may provide a new approach for the preparation of high-performance aerogel fibers for personal thermal management.
研究领域:
材料科学
·
生物工程
✓ 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）