CERAMICS INTERNATIONAL
·
2026
·
IF 6
Liqing Zou,Yuheng Zhang,Liuying Huang,Shuyuan Zhao,Yuxi Yu
Silica aerogel is the most extensively studied and technologically mature material in the field of thermal insulation. However, the application of silica aerogel in high-temperature fields is limited because of its significant shrinkage above 800 °C, pore structure collapse, and high transmittance for near-infrared radiation. To overcome these intrinsic limitations, a series of Si/Al/Zr aerogels with varying Zr contents were synthesized via the sol-gel method in this study. The Si/Al/Zr aerogels exhibited low density (0.05–0.096 g cm −3 ) and low thermal conductivity (0.02754–0.02961 W (m K) −1 ). After heat treatment at 1100 °C for 2 h, the aerogel with a Zr/Si molar ratio of 0.24 demonstrated the highest specific surface area (303.29 m 2 g −1 ) and the largest pore volume (0.74 cm 3 g −1 ). The simulation results revealed that the maximum cold-face temperatures of the aerogel with a Zr/Si molar ratio of 0.32 and the AF/Zr-0.32 aerogel composite (Al 2 O 3 fiber blankets reinforced with Zr-0.32 aerogel) were 167.95 °C and 193 °C, respectively. Furthermore, the AF/Zr-0.32 aerogel composite exhibited outstanding fire resistance and thermal insulation properties. After 15 min of exposure to a 1300 °C butane flame, the temperature difference exceeded 802.9 °C between the back face and the exposed face. This novel aerogel system demonstrated great potential for advancing high-temperature fire resistance and thermal insulation technologies, effectively surmounting the limitations of traditional silica aerogels.
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DOI
高影响因子
Gels
·
2025
·Vol. 11
·期 11
·929
·
IF 5.3
Mingkang Wang,Shuai Yu,Jing Wang,Xin Zhao,Changpeng Yang,Ran Wei,Chun Liu,Sizhao Zhang
Polyimide aerogels have garnered considerable attention due to their high-performance combination of a lightweight nature, low thermal conductivity, and high mechanical strength, which renders them ideal candidates for thermal insulators in aerospace. However, the inherent conflict in achieving multifunctional (dimensional stability and mechanical stiffness at high temperatures, and highly efficient thermal insulation) integration presents a great challenge. Here, we present an aerogel skeleton construction strategy based on hybridizing an Al–O network phase to create multifunctional polyimide aerogels. The resulting aerogels partially constructed by Al–O network phase exhibit an outstanding resistance to high temperatures (shrinkage of 0.56% after experiencing 200 °C for 2400 s), which is markedly superior to that of conventional polyimide aerogels. The excellent insulation capability of the aerogel is reflected in its low thermal conductivity (0.0214 W m −1 K −1 ) and its ability to maintain a cold-side temperature of just 59.7 °C under a 150 °C heat source. Furthermore, remarkable enhancements in mechanical properties are found at high-temperature conditions, providing evidence for the compressive stresses of 0.329 and 0.394 MPa under 3% strain at the respective temperatures of 200 and 250 °C, showing a clear trend of enhanced compressive stress with rising temperature. These advancements in high-temperature stability and mechanical properties substantially broaden the scope for their potential applications in aerospace thermal protection systems.
研究领域:
材料科学
·
航空航天工程
·
热防护系统
·
聚合物纳米复合材料
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DOI
PubMed
高影响因子
Materials Today Chemistry
·
2024
·
IF 6.7
Xiaoyu Zhou,Chuanliang Wu,Zelin Zhao,Yusheng Wang,Yuanyuan Yang,Jingxing Guo,Jia Wang,Xiaolong He,Yinyu Xiang,Ning Han,Junsheng Li
Despite the bright future of aluminum-sulfur (Al–S) batteries due to the ultrahigh energy-to-price ratios, the development of this new energy storage system is plagued by the shutting of polysulfides and sluggish kinetics during redox conversions. Herein, ferrocene as efficient polysulfide mediators and electrocatalysts is covalently grafted onto glass fiber (GF) membranes, which serves as separators in Al–S batteries. Attributed to the strong chemisorption and catalytic effect of metallocene toward polysulfide conversions, Al–S cells assembled with the grafted separators deliver an ultrahigh initial capacity of 1347.9 mAh g −1 (at 200 mA g −1 ) and desirable rate performance (328.1 mAh g −1 at 500 mA g −1 ). As validated by theoretical calculations, effective polysulfide binding is achieved through beneficial cation-π interactions between Al 3+ in polysulfides and the negatively charged cyclopentadienyl ligands in ferrocene, providing novel insights into the exploration of metal-sulfur chemistries for stable energy storage.
研究领域:
储能材料
·
电化学
·
材料科学
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高影响因子
International Journal of Minerals Metallurgy and Materials
·
2024
·Vol. 31
·期 3
·552-561
·
IF 5.6
Cao Kangzhe,Wang Sitian,He Yanan,Ma Jiahui,Yue Ziwei,Liu Huiqiao
Al is considered as a promising lithium-ion battery (LIBs) anode materials owing to its high theoretical capacity and appropriate lithation/de-lithation potential. Unfortunately, its inevitable volume expansion causes the electrode structure instability, leading to poor cyclic stability. What’s worse, the natural Al 2 O 3 layer on commercial Al pellets is always existed as a robust insulating barrier for electrons, which brings the voltage dip and results in low reversible capacity. Herein, this work synthesized core–shell Al@C–Sn pellets for LIBs by a plus-minus strategy. In this proposal, the natural Al 2 O 3 passivation layer is eliminated when annealing the pre-introduced SnCl 2 , meanwhile, polydopamine-derived carbon is introduced as dual functional shell to liberate the fresh Al core from re-oxidization and alleviate the volume swellings. Benefiting from the addition of C–Sn shell and the elimination of the Al 2 O 3 passivation layer, the as-prepared Al@C–Sn pellet electrode exhibits little voltage dip and delivers a reversible capacity of 1018.7 mAh·g −1 at 0.1 A·g −1 and 295.0 mAh·g −1 at 2.0 A·g −1 (after 1000 cycles), respectively. Moreover, its diffusion-controlled capacity is muchly improved compared to those of its counterparts, confirming the well-designed nanostructure contributes to the rapid Li-ion diffusion and further enhances the lithium storage activity.
研究领域:
材料科学
·
电化学
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能源存储
·
纳米结构设计
·
金属基复合材料
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高影响因子
MICROPOROUS AND MESOPOROUS MATERIALS
·
2012
·
IF 3.285
Yi Liu,Hai-Xiao He
Mesoporous alumina with a narrow pore size distribution is synthesized by direct thermolysis of Al-based coordination polymer. By applying the appropriate thermolysis temperature, both high surface area and large pore volume are obtained with the collapses and elimination of the 1,4-benzenedicarboxylate linkers of Al-based coordination polymer. This new class of mesoporous alumina display better adsorption properties and higher thermal stability, which retain mesoporous properties and high surface area after calcination in 900 °C. This thermolysis method provides a new approach to synthesize mesoporous alumina with high thermal stability by using coordination polymers.
研究领域:
材料科学
·
无机化学
·
纳米材料
·
多孔材料
·
热分析
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DOI
高影响因子
SCRIPTA MATERIALIA
·
2013
·Vol. 69
·期 8
·574-577
·
IF 2.821
Limeng Liu,Lianbing Zhong,Baoyou Zhang,Zhonghong Lai,Feng Ye,Zhiguo Zhang,Yu Zhou
The effects of the addition of 5 mol.% aluminum , copper, silver or gold on the densification , microstructures, mechanical properties and oxidation resistance in thin air of TaC ceramics were investigated. Full density and relatively high flexural strength (up to 738 MPa) were observed in the case of the Au addition after spark plasma sintering at 1700 °C for 5 min under 30 MPa pressure. Due to wetting of the TaC grains by a thin metallic film , the consolidated materials showed enhanced oxidation resistance against thin air.
研究领域:
材料科学
·
陶瓷
·
冶金学
·
高温材料
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高影响因子
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
·
2023
·
IF 6.4
Yang Wang,Qiang Liu,Biao Zhang,Hongxu Wang,Paul J. Hazell,Bo Li,Tao Song,Ling Li,Futian Liu,Feng Ye
Functionally gradient materials (FGMs) primarily composed of a discretely layered structure with relatively sharp macroscopic interfaces are highly susceptible to interlayer failure under impact loading . Nacre is regarded as a model system for lightweight armor with high impact-resistant performance owing to its multiple length-scale and gradient structures. However, the simultaneous translation of both structural features into artificial assemblies remains challenging. Herein, we constructed new B 4 C/2024Al FGMs with eliminated sharp interfaces, which reproduced the hierarchical and gradient architectures of nacre. A combined experimental and numerical approach was employed to investigate the protective mechanisms of nacre-like FGMs subjected to 7.62 mm armor-piercing incendiary bullet, and two homogeneous composites were also tested under the same conditions for comparison purposes. The FGMs exhibited improved performance to resist ballistic attacks and maintain integrity compared with the uniform structures. As the ceramic contents decreased along the thickness, the energy dissipation mechanisms transitioned from eroding projectile to plastic deformation . The toughness gradient and varying energy dissipation modes prevented the formation of crushed cones at the ceramic-rich layers. The nacre-like structure created several extrinsic toughening mechanisms, which led to the increased energy-absorbing capability of the target. Meanwhile, the eliminated abrupt interfaces avoided the occurrence of interlayer tearing by diminishing the tensile wave strength and the sudden change of wave impedance, which prolonged the projectile-target interaction period and strengthened the eroding effect on the projectile. The present study opens new opportunities to design advanced lightweight FGMs armors with high impact-resistant protective performance.
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高影响因子
ACS Applied Nano Materials
·
2023
·
IF 5.9
Jie Ji,Rui Cui,Li Liang,Heng Xu,Haozhe Li,Xiang Ke,Xiang Zhou,Xiaode Guo
To improve the pressure output ability of nanothermites to meet the needs in many fields, with the more volatile advantage of metal fluoride products (AlF3), this paper proposes the scheme of nanothermites (Al/CuF2). The energy release process of Al/CuF2 with different equivalent ratios under slow and fast heating rates has been studied. Under the slow heating rates, it was found that the equivalent ratio (Φ) has a significant influence on the energy release process. When Φ ≤ 1, the product is dominated by Cu. With the increase of the equivalent ratio, Al2Cu gradually appeared in the product, indicating that the increase of Al powder contributed to the enhancement of the alloy reaction. On the other hand, to further investigate the actual application of the Al/CuF2 mixture, combustion experiments in a closed container and in open air were carried out and compared with those of Al/CuO. In accordance with our design concept, AlCuF2 shows more excellent gas release ability. Al/CuF2 (Φ = 3) has the most excellent pressure output capacity (2.67 MPa), which increases by 107% compared to 1.29 MPa (Al/CuO). In addition, Al/CuF2 displays more excellent ignition performances in terms of shorter delay time and less ignition energy. Therefore, Al/CuF2 composite particles, as a novel nanothermite design, are expected to be widely used in the gas generator, micropropulsion, and other military and civilian fields.
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高影响因子
International Journal of Electrochemical Science
·
2023
·
IF 1.5
Suichang Ong,Huili Yang,Tu Lan,Kai Huang,Tianzheng Xie,Jinxia Zhou,Yuan Cheng,Hang Guo,Ying Zhang
Surface coating and element doping are the key strategies in LIBs development to achieve a high and stable battery performance. In this paper, ZrO 2 is directly sputtered on the Al-doped LiCoO 2 (Al-LCO) composite electrodes, enabling a controllable oxide coating on the surface of the electrode. With a sputtered coating layer of ∼6 nm, the discharging capacity of the Al doped LCO coated with ZrO 2 (Al-LCO-ZrO 2 ) is 141.04 mAh g −1 at the 100th cycle within 3.0–4.7 V at 1 C, while the Al-LCO (without coating layer) is 126.66 mAh g −1 . After 100 cycles of charging-discharging at high voltage region, the capacity retention of the Al-LCO-ZrO 2 -3 (90.7%) is also higher than the Al-LCO (75.57%). It is worth noting that, in this paper, due to the Al doping and the ZrO 2 coating, we increase the operation voltage up to 4.7 V, in which the batteries can obtain a higher energy density.
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高影响因子
MOLECULES
·
2022
·Vol. 27
·期 21
·7614
·
IF 4.927
Jiaxin Su,Yan Hu,Bin Zhou,Yinghua Ye,Ruiqi Shen
Metastable intermixed composites (MICs) have received increasing attention in the field of energy materials in recent years due to their high energy and good combustion performance. The exploration of ways of improving their potential release of heat is still underway. In this study, Al–CuO/graphene oxide (GO) nanocomposites were prepared using a combination of the self-assembly and in-suit synthesis methods. The formulation and experimental conditions were also optimized to maximize the exothermic heat. The DSC analysis shows that the addition of the GO made a significant contribution to the exothermic effect of the nanothermite. Compared with the Al–CuO nanothermite, the exothermic heat of the Al–CuO/GO nanocomposites increase by 306.9–1166.3 J/g and the peak temperatures dropped by 7.9–26.4 °C with different GO content. The reaction mechanism of the nanocomposite was investigated using a DSC and thermal reaction kinetics analysis. It was found that, compared with typical thermite reactions, the addition of the GO changed the reaction pathway of the nanothermite. The reaction products included CuAlO2. Moreover, the combustion properties of nanocomposite were investigated. This work reveals the unique mechanism of GO in thermite reactions, which may promote the application of carbon materials in nanothermite.Keywords:graphene oxide;metastable intermixed composites (MICs);nanothermite;thermokinetics;combustion
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PubMed
高影响因子
COMBUSTION AND FLAME
·
2022
·
IF 5.767
Qianqian He,Jun Wang,Yaofeng Mao,Wei Cao,Jie Chen,Fude Nie
To improve and adjust the combustion and energy output of HMX/Al, graphite fluoride (CF) as oxidizer was introduced in HMX/Al and gradient structured HMX/Al/CF was prepared by additive manufacturing technology . For HMX/Al added with CF, a significantly exothermic peak is observed ranging from 860 to 950 °C due to the reaction of Al and fluorine derived from CF decomposition, and the heat release increases by 106.63% compared to that of HMX/Al. The fourth exothermic heat increases from 161.48 to 955.25 J/g with the increased Al content from 10 to 30 wt%. Moreover, the combustion rate and pressure output of HMX/Al have been improved by introducing CF. For HMX/Al added with CF, the combustion time decreases from 10.3 to 2.5 s, which is dependent on the Al content from 10 to 30 wt%. And the highest peak pressure is 1712.2 kPa when Al content is 20 wt% in HMX/Al/CF composites. Furthermore, gradient structured HMX/Al/CF consisting of three layers with Al content of 10, 20 and 30 wt% was prepared to improve combustion and pressure output. The combustion rate and peak pressure of gradient structured HMX/Al/CF are higher than those of single structured HMX/Al/CF. The highest peak pressure (∼2.24 MPa) is obtained when the Al content of the middle layer and outer layer is 30 wt% and 20 wt% in the gradient structured HMX/Al/CF cylinder, respectively. Finally, the reaction intermediates and combustion reaction products were fully characterized to understand the enhanced effect of CF in HMX/Al. This work provides a promoting way to improve and regulate the combustion reaction performance and pressure output of HMX/Al.
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CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Guotai Zhang,Chunxi Hai,Yuan Zhou,Weiping Tang,Jingze Zhang,Jinbo Zeng,Yanhua Liu,Shengde Dong,Guiping Peng
A surge of interest has been attracted by Li 1.6 Mn 1.6 O 4 -type adsorbent for collecting lithium resources from salt-lake brines due to its excellent selectivity, high theorical adsorption capacity up to 72. 3 mg g −1 and low cost. However, its large-scale practical application is limited because of its bone element Mn dissolution during the cycled desorption process. Herein, F and Al co-modifying technique, an efficient method for stabilizing its spinel structure or forming protective coating, was employed to improve the application performances of Li 1.6 Mn 1.6 O 4 -type adsorbent prepared by sol–gel method. Based on the various characterization results, the co-modification not only leads to the formation of fluoride-rich coating and the substitution of Mn 3+ by Al 3+ , but also generates the active adsorbents with abundant nano-islands. DFT calculations revealed that the coating layer is indeed AlF 3 rather than LiF. In addition, in-situ high-temperature XRD tests demonstrates that the co-modification can significantly enhance the heat resistance and structural stability of the material. As-prepared adsorbent exhibits greatly improved Li adsorption capacity (increased from 28.5 to 33.7 mg g −1 ), lower Mn loss rate (decreased from 2.1 to 1.8%), enhanced cycling stability and good adsorption selectivity in the Qarhan brine containing Na + , K + , Ca 2+ , Mg 2+ , which is very significant and important for effectively removing lithium from low-grade brines.
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高影响因子
危险品化学品经营许可证（带存储）