ACS Nano
·
2022
·
IF 18.027
Qingqing Cheng,Zhizhi Sheng,Yongfeng Wang,Jing Lyu,Xuetong Zhang
Aerogels represent a kind of nanoporous solid with immense importance for a plethora of diverse applications. However, on-demand conformal shaping capacity remains extremely challenging due to the strength unfavorable during aerogel processing. Herein, a universal microgel-directed suspended printing (MSP) strategy is developed for fabricating various mesoporous aerogels with spatially stereoscopic structures on-demand. As a proof-of-concept demonstration, through the rational design of the used microgel matrix and favorable printing of the Kevlar nanofiber inks, the Kevlar aerogels with arbitrary spatial structure have been fabricated, demonstrating excellent printability and programmability under a high-speed printing mode (up to 167 mm s–1). Furthermore, the custom-tailored Kevlar aerogel insulator possessing superior thermal insulation attribute has ensured normal discharge capacity of the drone even under a harsh environment (−30 °C). Finally, various types of spatial 3D aerogel architectures, including organic (cellulose, alginate, chitosan), inorganic (graphene, MXene, silica), and inorganic–organic (graphene/cellulose, MXene/alginate, silica/chitosan) hybrid aerogels, have been successfully fabricated, suggesting the universality of the MSP strategy. The strategy reported here proposes an alternative for the development of various customized aerogels and stimulates the inspiration to truly arbitrary architectures for wider applications.
研究领域:
材料科学
·
纳米技术
·
增材制造
·
热工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Gels
·
2022
·Vol. 8
·期 5
·308
·
IF 4.432
Zixuan Zheng,Guojie Liang,Li Li,Jing Liu,Xinbo Wang,Yi Sun,Kai Li
The weak inherent non-covalent interactions between carbon aerogel backbone nanoparticles obtained by the pyrolysis of conventional organic aerogel can lead to poor mechanical properties. When applied in the thermal protection system of a high-speed spacecraft, the preparation of carbon aerogel insulation materials with excellent formability and high mechanical strength still remains a huge challenge. This work reports an efficient approach for fabricating carbon foam-reinforced carbon aerogel composites by compounding the nanoporous polyimide aerogel into the microporous pre-carbonized phenolic resin-based carbon foam via vacuum impregnation, gelatinizing and co-carbonization. Benefiting from the co-shrinkage caused by co−carbonization, the thermal insulation capacity of the carbon aerogel and the formability of the pre−carbonized foam are efficiently utilized. The shrinkage, density and carbon yield of aerogels, pre-carbonized foams and the composites at different temperatures were measured to analyze the formation of the interfacial gap within the composite. The co-carbonization mechanism of the polyimide aerogels and phenolic resin-based pre-carbonized foams was analyzed through XPS, TG-MS, and FT-IR. Among the prepared samples, CF30-CPI-1000 °C with small interfacial gaps showed the lowest thermal conductivity, which was as low as 0.56 W/(m·K) at 1900 °C, and the corresponding compressive strength and elastic modulus were as high as 0.532 MPa and 9.091 MPa, respectively.Keywords:polyimide aerogel;carbon aerogel;thermal conductivity;shrinkage;co-carbonization mechanism
研究领域:
材料科学
·
航空航天工程
·
隔热材料
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
·
2022
·Vol. 104
·期 2
·300-310
·
IF 2.606
Wang Linyan,Li Wenjie,Pang Tianliang,Liu Hang,Wang Chan,Zhou Liang,He Fei
Nanofiber-like and nanorod-like boehmite aerogels (BAs) were synthesized by using 1D boehmite nanofibers and nanorods as building units and chitosan as binder via sol-gel process and freeze-drying method. Two kinds of boehmite sols were both gelled via ammonia vapor gelation method. Nanofiber-like building units interconnect and tangle to form high-surface-area porous structures of BA-160, while nanorod-like ones self-accumulate and overlap to construct large-pore-diameter skeletons of BA-200. The compressive property of BAs mainly originates from the interaction of overlap joints between building units, and the overlap joints among nanofibers provide more anti-pressure positions than the ones among nanorods. The skeletons are further enhanced under the help of chitosan macromolecules due to the improved polycondensation between aluminoxane via ammonia vapor. With the increase of chitosan content, the mechanical properties of BAs increase, but the thermal conductivities decrease. All of ultralight BAs can be regarded as good thermal insulation materials.
Nanofiber-like and nanorod-like boehmite aerogels (BAs) were synthesized by using 1D boehmite nanofibers and nanorods as building units and chitosan as binder via sol-gel process and freeze-drying method. Boehmite sols turning into gels were induced by ammonia vapor, which is beneficial to homogeneous gelation of boehmite sols. Two kinds of BAs possess different mechanical properties due to different porous structural characteristics. All of BAs present the features of ultralight and thermal insulation.
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
COMPOSITES COMMUNICATIONS
·
2024
·
IF 6.5
Rufei Ge,Jie Zhang,Ning Yang,Zihao Fan,Rongying Yin,Haiming Cheng,Changqing Hong,Xinghong Zhang
Lightweight ablative material has served the critical role of protecting space vehicles upon hypersonic entry. However, low oxidation resistance hinders its long-time high-efficiency service in a high-temperature oxidizing atmosphere. Herein, we prepared a lightweight ternary interpenetrating network of three-dimensional carbon fabric, siloxane aerogel , and phenolic aerogel , which are structurally interpenetrating in macro-, micron-to nanoscale and chemically crosslinking at the molecular scale , resulting in a unique combination of low-density (∼0.3 g/cm 3 ), good thermal stability and oxidation resistance , outstanding mechanical properties, and ultralow thermal conductivity . More intriguingly, long-time thermal protection performance (zero surface recession and temperature below 60 °C at 38 mm in-depth after being exposed to 1300 °C for 20 min). The findings of this work provide not only a great potential candidate material for long-time thermal protection in aviation and aerospace applications but also a simple but efficient approach to fabricating multifunctional binary, ternary, and even multiple interpenetrating networks.
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
ADVANCED FUNCTIONAL MATERIALS
·
2024
·
IF 18.5
Yucheng Tian,Yixiao Chen,Sai Wang,Xianfeng Wang,Jianyong Yu,Shichao Zhang,Bin Ding
Maintaining body temperature within safe and comfortable range is crucial; however, thermoregulatory materials face challenges in variable environments and extreme application scenarios. Here, a unique dual air-gelation strategy is developed to synthesize carbon aerogel nanofiber metafabric for energy-harvesting thermoregulation. By manipulating polyacrylonitrile/water interaction and charge density of the solution, phase separation and Coulombic repulsion in electrospun jets are promoted, forming curly nanofibers with internal nanopores (size 30–60 nm) that entangle to create nanofibrous dual-aerogel structure; the carbon aerogel nanofiber metafabric is obtained following pre-oxidation and optimized graphitization. The resulting metafabric exhibits high elasticity, robust temperature resistance from −196 to 600 °C, exceptional thermal insulation performance, high-efficiency electrothermal capability (adjustable from 15 to 150 °C), and photothermal property (radiation raised temperature by 22 °C). This work provides rich possibilities to develop advanced carbon nanomaterials for thermal management.
研究领域:
材料科学
·
能源工程
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2014
·Vol. 4
·期 93
·51146-51155
·
IF 3.708
Jin Wang,Yong Wei,Weina He,Xuetong Zhang
A versatile ambient pressure drying (APD) method for synthesizing silica aerogels, as well as silica-based composite aerogels with different colors or functions, has been developed in this work. The presented polyethoxydisiloxane (PEDS) was held under basic conditions in ethanol and alcogels were obtained, which was followed by hexane solvent-exchange and pore surface modification, and then the wet gels were dried under ambient pressure at temperatures ranging from 25 to 150 °C to produce silica aerogels with high BET surface areas and low thermal conductivities. Various guests were introduced, e.g., dyes, Fe3O4 nanoparticles and Ag nano-wires in the sol–gel process, and colored, magnetic or bio-functional silica aerogels were synthesized by the APD method. All the products were of high BET surface areas varying from 500 to 1000 m2 g−1 and of average pore sizes in the range of 8–20 nm, regardless of the drying temperature and the presence of dye molecules or embedded nano-particles. The tapping densities of the aerogels were in the range of 0.03 to 0.2 g cm−3, and the thermal conductivities were found varying from 0.022 to 0.040 W m−1 K−1. Moreover, the structures and morphologies of the aerogels were investigated by FTIR and SEM, respectively. The stability of the colored aerogels was studied by UV-vis spectrometry, and the results indicate that the dyes were embedded in the aerogels and may be gradually released. Furthermore, the capacity of the magnetic aerogels for wastewater treatment was investigated. In general, an APD method, involving a single hexane-exchange step, has been developed, and the preparation of various silica-based composite aerogels prepared by APD is achieved. This APD method shows a great potential to synthesize silica aerogels and its hybrid aerogels on an industrial scale.
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 ENVIRONMENTAL MANAGEMENT
·
2025
·
IF 8.4
Yiming Liu,Weixuan Pan,Hui Zhang,Ningxin Geng,Liangxu Jiang,Jiaan Bao,Huiwen Wu,Qi Liu
In this study, a composite aerogel was synthesized through the in situ integration of ZIF-8 within a sodium alginate (SA) framework, followed by cross-linking and freeze-drying. SA@ZIF-8 demonstrated enhanced adsorption capacity and reusability. The introduction of ZIF-8 improved the aerogel’s surface properties and generated abundant porous adsorption sites. At 298 K, the composite exhibited a maximum theoretical adsorption capacity of 200.4 mg g −1 for tetracycline (TC). The adsorption process of SA@ZIF-8 for tetracycline followed the pseudo-second-order kinetic model and the Langmuir isotherm model. The adsorption mechanisms include synergistic effects, hydrogen bonding, coordination bonding, electrostatic attractions, and π–π interactions. In addition, following ten adsorption-desorption cycles, the material consistently demonstrated a removal efficiency surpassing 65.7 %. On the whole, this study demonstrates an efficient biomass adsorbent for the removal of tetracycline from drain water. The prepared composite aerogel exhibits excellent reusability for efficient tetracycline removal from wastewater, demonstrating strong potential for practical water treatment applications.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
RSC Advances
·
2017
·Vol. 7
·期 26
·16210-16216
·
IF 3.108
Guangjie Yang,Tianli Ning,Wei Zhao,Wenxiu Deng,Xikui Liu
Here, using water as the only solvent, we report the first green approach to the morphological controlled synthesis of robust ambient dried polyimide aerogels composed of interconnected hollow spheres. The addition of graphene oxide can direct the growth of polyimide into nanofibers and form 1D–2D nanohybrid aerogels. The mechanism behind is a soft/hard template directed dissolution-polymerization-reprecipitation process. After carbonization, a monolith carbon aerogel with monodisperse micropores could be formed. Such a green approach for the morphology controlled synthesis of robust polyimide aerogels and their carbon aerogels should be of great value for their environmental and energy related applications.
研究领域:
材料科学
·
环境科学
·
能源科学
✓ 已验证
DOI
高影响因子
GREEN CHEMISTRY
·
2021
·Vol. 23
·期 16
·6065-6075
·
IF 10.182
Kai Rong,Jiale Wei,Yuchen Wang,Jingwei Liu,Zhen-An Qiao,Youxing Fang,Shaojun Dong
We developed a novel electrospinning strategy, using choline chloride–lactic acid (ChCl–LA) deep eutectic solvent (DES) as an electrospinning solvent to produce lignin fiber aerogels (LFA). The novel strategy is sustainable and cost-effective because no toxic or flammable volatile organic solvents were used and the precursors and waste were designed to be recycled. The fabricated LFA has the appearance of a piece of cotton, and the specific mass was calculated and found to be as low as 3 mg cm−3 with a porosity of over 99.7%. After stabilization and carbonization at a high temperature, the LFA can transform into lignin-based carbon fiber aerogels (LCFA). The LCFA has a high specific surface area (580 m2 g−1) and conductivity, and can be used as an electrochemical electrode material. We made supercapacitor electrodes using the LCFA, the specific capacitance of which is 155 F g−1, much higher than that of commercial multi-wall carbon nanotubes (39 F g−1) at a current density of 0.5 A g−1. The LCFA also have a high electrochemical cycling stability. For the supercapacitor electrodes, only a 2% decrease was observed after 5000 cycles. Moreover, all waste in this work was recycled and reused five times to achieve electrospinning with almost no waste.
研究领域:
材料科学
·
环境科学
·
能源科学
✓ 已验证
产品关联
DOI
高影响因子
DIAMOND AND RELATED MATERIALS
·
2020
·
IF 2.65
Xian Yue,Jiyong Feng,Huaxin Li,Zhou Xiao,Yunsheng Qiu,Xianbo Yu,Junhui Xiang
Bacterial cellulose aerogels (BCAs) were obtained from a delicious food grade coconut. Following with a simple process of carbonized calcination (700 °C~1100 °C). The obtained coconut matrix carbon nanofiber aerogels (CMCNFs) exhibit low density (≤3.47 mg/cm 3 ), high surface area (≥1102 m 2 /g), and high porosity (≈99.6%), which are much higher than those of common BCAs owing to the removal of hydrogen, oxygen and other elements along with only small volume changes. Due to the flexibility of the nanofiber matrix of our presoma, the three-dimensional network micro-structure is preserved during high temperature carbonization process . The obtained CMCNFs show an excellent conductivity bearing a direct electron transfer process between glucose oxidase (GOx) and electrode surface in the electrochemical processes . It was discovered that CMCNFs can achieve a fast direct electron transfer (DET) of GOx to the rapid detection of glucose. This character should be related to the three-dimensional pore structure determined by carbonization temperature, which has been proved that the CMCNFs calcined at 1000 °C possesses the best capabilities. With merits above, a highly sensitive glucose sensor is successfully prepared by the simple carbonization of coconut cellulose matrix, which expands the application scope of bacterial cellulose aerogels. This work also offers insights for the future develop of protein-based electrochemical devices .
研究领域:
材料科学
·
生物化学
·
电化学
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Chengxi Ding,Dongxiao Hu,Xinrui He,Yifan Lai,Gaofeng Shao
SiC aerogels are representative high-temperature ceramic aerogels that have demonstrated extensive potential utility in the thermal insulation field under extreme conditions. Although the efficient fabrication of monolithic and highly crystalline SiC aerogels is crucial, it remains highly challenging. Herein, a one-step pyrolysis strategy of a bridged polysilsesquioxane (BPSi) aerogel precursor is reported. The preceramic BP aerogel was prepared via a sol-gel method followed by vacuum drying, and the subsequent pyrolysis process conveniently converted the BPSi aerogel precursor into a SiC aerogel. This circumvents the need for harsh synthetic conditions, high-cost noble metal catalysts, special drying, and additional calcination processes. Furthermore, a competitive mechanism between the “gas-escape” caused by the volatilization of low molecular compounds and carbothermal reduction reaction, and the “volume-shrinkage” resulting from high-temperature sintering was proposed to explain the evolution of phase composition and pore hierarchy of BPSi-derived ceramic aerogels.
研究领域:
材料科学
·
陶瓷工程
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2020
·Vol. 47
·期 7
·9083-9089
·
IF 3.83
Hongli Liu,Lantian Zhang,Jing Li,Hongyan Li,Guoqing An,Yajing Li,Zhong Chen
SiBCN ceramic aerogels have excellent properties such as ultra-high temperature stability, low density and high thermal insulation . The aerogels have better potential applications in aerospace and other fields. However, similar to inorganic aerogels , the low mechanical strength of SiBCN ceramic aerogels are the main limitation of its application. Based on the principle of inorganic double network enhancement, the first network was constructed by PVA and HNTs , and HNTs/SiBCN dual network aerogels were constructed by SiBCN ceramic aerogels as the second network. The structure and mechanical properties were characterized by scanning electron microscope (SEM), transmission electron microscope (TEM), X-ray diffraction (XRD), specific surface area analyzer and pressure tester. Compared with SiBCN ceramic aerogels, 6 wt% HNTs-SiBCN ceramic hybrid aerogels have better microscopic properties (maintaining basic porous network structure and structural stability) and mechanical properties.The continuous HNTs first network can effectively transfer the stress load and enhance the strength of SiBCN ceramic aerogels.
研究领域:
材料科学
·
无机非金属材料
·
纳米复合材料
·
航空航天材料
·
高分子复合材料
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）