CARBON
·
2024
·
IF 10.5
Fuhao Xu,Yixian Wang,Fangchen Tang,Xiaolei Dai,Zhiyang Zhao,Yong Kong,Xiaodong Shen,Gaofeng Shao
As space science and technology rapidly advance, spacecraft are increasingly subjected to severe thermal and electromagnetic environments. This has created an urgent demand for materials that offer both microwave absorption and thermal insulation. Herein, we present one-dimensional (1D) carbon nanotube (CNT)/SiC nanostructure-reinforced SiC-based aerogels via carbothermal reduction of resorcinol-formaldehyde/silica composite aerogels containing CNTs. These composite aerogels were presynthesized using a straightforward one-pot sol-gel method, subsequently undergoing supercritical CO 2 drying. Conduction loss and mechanical strength are both simultaneously improved by the in-situ formation of 1D CNT@SiC core-shell nanostructures within granular SiC aerogels. The optimized SiC-based aerogel demonstrates exceptional performance, achieving a minimum reflection loss of −66.01 dB and the effective absorption bandwidth reaching 6.76 GHz. Additionally, it maintains a thermal conductivity of 0.0582 W/(m·K) at 25 °C, alongside a Young's modulus of 45.2 MPa at a density of 0.242 g/cm 3 . This design seamlessly combines various functionalities within the SiC-based aerogel system, offering significant guidance towards the development of cutting-edge functional aerogels designed to withstand extreme environmental challenges.
研究领域:
材料科学
·
航天工程
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产品关联
DOI
高影响因子
Small
·
2024
·
IF 13
Shuo Wang,Haiting Shi,Shuaitong Liang,Hao Li,Yuanhua Xia,Ruiqi Shao,Tianyu Li,Jie Shi,Xiaoqing Wu,Zhiwei Xu
Metal oxides with conversion and alloying mechanisms are more competitive in suppressing lithium dendrites. However, it is difficult to simultaneously regulate the conversion and alloying reactions. Herein, conversion and alloying reactions are regulated by modulation of the zinc oxide bandgap and oxygen vacancies. State-of-the-art advanced characterization techniques from a microcosmic to a macrocosmic viewpoint, including neutron diffraction, synchrotron X-ray absorption spectroscopy, synchrotron X-ray microtomography, nanoindentation, and ultrasonic C-scan demonstrated the electrochemical gain benefit from plentiful oxygen vacancies and low bandgaps due to doping strategies. In addition, high mechanical strength 3D morphology and abundant mesopores assist in the uniform distribution of lithium ions. Consequently, the best-performed ZnO-2 offers impressive electrochemical properties, including symmetric Li cells with 2000 h and full cells with 81% capacity retention after 600 cycles. In addition to providing a promising strategy for improving the lithiophilicity and mechanical strength of metal oxide anodes, this work also sheds light on lithium metal batteries for practical applications.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Desalination and Water Treatment
·
2024
·
IF 1
Yang Shen,Fatoye Sawyerr,Lunbo Xu,Shusu Shen,Xiaoji Zhou
The preparation of modified membranes utilizing the UiO-66 framework for wastewater filtration is regarded as one of the most promising approaches to wastewater treatment, owing to its high efficiency and cost-effectiveness. In this study, a post-modified MOF, UiO-66-RSA, was synthesized via the condensation reaction of UiO-66-NH 2 and 2,4-dihydroxybenzaldehyde. PVDF mixed matrix membranes (MMMs) were fabricated for the first time by mixing UiO-66-RSA into PVDF using the non-solvent induced phase separation (NIPS) method. Compared to pure PVDF membranes, the newly developed membrane, M4, demonstrated enhanced compatibility and superior mechanical strength. In dyeing wastewater treatment applications, M4 showed excellent separation efficiency for dye and heavy metal mixed wastewater, achieving rejection rates exceeding 90 %. Additionally, it maintained a high flux recovery rate (FRR > 90 %) and rejection rate (Rejection > 90 %) after six filtration cycles of dye-containing wastewater, indicating strong recyclability. These findings suggest that MMMs embedded with UiO-66-RSA hold significant promise for dyeing wastewater treatment.
研究领域:
材料科学
·
环境工程
✓ 已验证
产品关联
DOI
高影响因子
Forests
·
2024
·Vol. 15
·期 5
·836
·
IF 2.4
Yongyue Zhang,Jiayao Li,Yun Lu,Jiangtao Shi
Wood exhibits a limited elastic deformation capacity under external forces due to its small range of elastic limit, which restricts its widespread use as an elastic material. This study presents the development of a stretchable wood-based elastomer (SWE) that is highly mechanical and flexible, achieved without the use of chemical cross-linking. Balsa wood was utilized as a raw material, which was chemically pretreated to remove the majority of the lignin and create a more abundant pore structure, while exposing the active hydroxyl groups on the cellulose surface. The polyvinyl alcohol (PVA) solution was impregnated into delignified wood, resulting in the formation of a cross-linked structure through multiple freeze–thaw cycles. After eight cycles, the tensile strength in the longitudinal direction reached up to 25.68 MPa with a strain of ~463%. This excellent mechanical strength is superior to that of most wood-based elastomers reported to date. The SWE can also perform complex deformations such as winding and knotting, and SWE soaked in salt solution exhibits excellent sensing characteristics and can be used to detect human finger bending. Stretchable wood-based elastomers with high mechanical strength and toughness have potential future applications in biomedicine, flexible electronics, and other fields.
研究领域:
材料科学
·
生物医学工程
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产品关联
DOI
高影响因子
ACS Nano
·
2024
·
IF 15.8
Xiaojing Wang,Yiming Xu,Siyuan Xiang,Shengyang Tao,Wendong Liu
Supraparticles, formed through the self-assembly of nanoparticles, are promising contenders in catalysis, sensing, and drug delivery due to their exceptional specific surface area and porosity. However, their mechanical resilience, especially in dimensions spanning micrometers and beyond, is challenged by the inherently weak interactions among their constituent building blocks, significantly constraining their broad applicability. Here, we have exploited a robust supraparticle fabrication strategy by integrating hydrogel components into the assembly system and evaporating on the superamphiphobic surface. The resultant SiO2/SA (sodium alginate) supraparticles, achieved by evaporating a 15% volume fraction dispersion of SiO2 nanoparticles containing 18.46 mg/mL of sodium alginate and subsequently cross-linking with Ca2+, demonstrate mechanical robustness with a fracture force of 6.04 N, representing a mechanical strength enhancement of 60 times higher than that prior to the incorporation of the hydrogel component. The supraparticles maintain their original morphology after 30 min of ultrasonic treatment (200 W), demonstrating mechanical stability. This method exhibits generalizability, enabling the customization of supraparticles with various building blocks and hydrogel backbone materials. Based on such a methodology, we have synthesized enzyme-carrying supraparticles, further expanding the potential applications in intricate cascade reactions. The encapsulated glucose oxidase and horseradish peroxidase maintained their inherent reactivity, and such hydrogel-assisted robust supraparticles exhibited exceptional performance in accurate glucose assays, indicating great practical application in biocatalysis.
研究领域:
材料科学
·
生物化学
·
纳米技术
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产品关联
DOI
PubMed
高影响因子
CARBOHYDRATE POLYMERS
·
2024
·
IF 10.7
Jixiao Hao,Shuai Yan,Hua Yuan,Cong Du,Yeqiang Tan
Facing the severe problem of microplastic pollution, there is an urgent need to develop biodegradable fibers to replace the petrochemical fibers. Sodium alginate , a biomass polysaccharide , has gained widespread attentions recently for the fiber manufacture. However, the limited mechanical strength of alginate fibers restricts their usages as load-bearing fabrics and reinforcement fibers . Here, we develop a novel strategy to prepare alginate multifilaments using pre-crosslinked sodium alginate solutions. The increase in the pre-crosslinking ratio effectively hinders the disentanglement of sodium alginate chains at high stretches, causing an increase in the shear viscosity of the solution ascertained from the capillarity-driven thinning process from 4.5 Pa·s to 9.9 Pa·s and facilitating the high alignment and orientation of sodium alginate chains. The resultant fibers possess a breaking strength of 474 MPa, elongation at break of 16 %, Young's modulus of 14.4 GPa, and toughness of 51.8 MJ/m 3 , exceeding most biomass fibers without reinforcement additives. The high orientation degree of 0.865 and high spinnability of alginate multifilaments enable their applications in multi-channel encryption fabrics that exhibit distinct information under various optical conditions. This rheological regulation of spinning solutions provides a facile yet effective strategy to enhance the mechanical performance and broaden application scenarios of alginate fibers.
研究领域:
材料科学
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环境科学
·
生物工程
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产品关联
DOI
PubMed
高影响因子
CARBOHYDRATE POLYMERS
·
2021
·
IF 9.381
Ying Qi,Shaojian Lin,Jianwu Lan,Yifei Zhan,Junling Guo,Jiaojiao Shang
A transparent versatile cellulose platform film was prepared from Eucalyptus pulp in this work. Based on such cellulose platform, multifunctional cellulose films with ultraviolet-shielding, photochromism, and strong mechanical strength were fabricated via nucleophilic postmodification strategy by introducing a versatile spiropyran moiety into cellulose molecules. The fabricated cellulose films exhibited super-high transmittance up to 96% and performed notable ultraviolet-shielding capacity at 200–400 nm. Moreover, the photochromic performance of cellulose films with color changes could be clearly observed by the naked eyes, and the fluorescent blue could be excited. Besides, the tensile stress of multi-functional cellulose film was about 80 MPa, which was almost 8 times stronger than that of the commercial polyethylene film at the same thickness. It is noteworthy that these superior performances promote such a cellulose platform to be a versatile precursor for fabricating various multi-functional cellulose used in the fields of out-door coating, transparent packaging, optical screen, etc .
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2020
·Vol. 55
·期 36
·17255-17265
·
IF 3.553
Huang Jinxin,Zhang Wei,Li Heng,Yu Xiaogang,Ding Shuaiwen,Wu Chengwei
Biocompatible polydopamine–polyacrylamide (PDA–PAM) hydrogel has good self-healing performance. However, there is a trade-off between the self-healing ability and the mechanical strength. Excellent self-healing often results in the poor mechanical strength, which limits the application in load-bearing field. Here, we successfully prepare PDA–PAM hydrogels with improved strength and good self-healing properties simultaneously. By adjusting the pH and ammonium persulfate (APS) content of the hydrogel solution to promote dopamine (DA) polymerization, PDA–PAM hydrogel with a high content of polydopamine (PDA) is developed, which demonstrates excellent self-healing properties and mechanical strength. In particular, the PDA–PAM hydrogel with high PDA content (DA/AM = 5%) has a tensile strength of 16 kPa and the tensile strength spontaneously recovers 96% in 2 h after the tensile fracture. The obtained hydrogel also displays good biocompatibility.
研究领域:
材料科学
·
生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2020
·
IF 3.99
Kai Wang,Tian C. Zhang,Baibing Wei,Shixiong Chen,Ying Liang,Shaojun Yuan
Developing a durable and efficient oil/water separation membrane for purification of the oily water is crucial for sustainable aquatic ecosystems and public health. Herein, a superhydrophobic and superoleophilic nanofibrous membrane was successfully developed with an improved mechanical strength via a facile method of blend-electrospun. By introducing an ultralow amounts of carbon nanotubes (CNTs, 0.15 wt%, 2.55 mg/g), the obtained composite membrane exhibited a satisfactory hydrophobic (water contact angle, WCA = 152°) and oleophilic nature (oil contact angle, OCA ∼ 0°, oil permeation time =91.63 ms). The as-prepared composite membrane exhibited a strong acid/alkali resistance (pH = 1–14), high thermal stability (160 °C), and good mechanical stability; it had a high oil-water separation flux (max = 9270 L m -2 h -1 ) and a separation efficiency of > 99% under the driving of gravity, indicating a significant applicability for energy-saving filtration. The integration of high performance, low cost, and a simple solution-based fabrication process makes the as-prepared membranes have a great potential for future applications.
研究领域:
材料科学
·
环境工程
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2020
·
IF 5.774
Qingwu Long,Jiexin Chen,Zhu Wang,Zhe Zhang,Guangxian Qi,Zhao-Qing Liu
Oil fouling is a major obstacle for the efficient and reliable oil-water separation of mesh-based membrane processes. Innovations in membrane materials and preparation processes are therefore needed to develop anti-oil-adhesion strategies. This study reports a series of vein-supported porous membranes (VPMs) fabricated by casting polyacrylonitrile (PAN) on veins through non-solvent induced phase separation, confirmed by FTIR, SEM and XRD characterizations, and applied as an effective oil-water separation membrane. Benefiting from the combination of tubular-like vein and hydrophilic PAN, the resultant VPM demonstrates a fine-tunable morphology and superhydrophilicity, extremely boosting underwater superoleophobicty, mechanical strength and superior performance for oil/water separation to various oily mixtures/emulsions, showing underwater oil contact angles over 157° and nearly zero underwater oil adhesion. In oil-water mixture separation process, a separation efficiency of > 99% and ultrahigh permeation flux of 9592 LMH can be achieved under gravity conditions using VPM-2 (casting with 2 wt% PAN). For oil-water emulsion separation, a highest flux of 3011 LMH and trace oil concentration <10 ppm in the filtrate was generated using VPM-9 (casting with 9 wt% PAN) under a low external pressure of 3 kPa. The VPM-2 membrane is further carried out a 40-h cycling separation, showing a constantly stable water flux of ~6000 LMH. The developed VPMs open a bright path to use biomaterials for design and fabrication of novel oil-water separation membrane.
研究领域:
材料科学
·
环境工程
✓ 已验证
产品关联
DOI
高影响因子
COMPOSITES SCIENCE AND TECHNOLOGY
·
2020
·
IF 7.094
Chunyu Du,Min Cao,Mei Li,Hong Guo,Rukang Liu,Baoan Li
Noteworthy improvements of functional composite materials that combine excellent thermal conductivity and superior mechanical strength have induced the rapid development of thermal management technology. However, the frustrating dispersion of fillers leads to phonon scattering, thereby hindering the thermal conduction in the polymer matrix . This study reports an urchin-structured filler that is obtained via hydrothermal synthesis and subsequent graphitic carbon coating and its application in thermally conductive composites. The obtained composites exhibit high thermal conductivity at low filler loadings (2.306 W/m·K, 5 wt%) and excellent stability of the thermal conductivity with the change of the operating temperature. The high thermal conductivity is attributed to the improved dispersibility of the urchin-structured filler according to Agari's model. This work paves a new way for the synthesis of reinforced fillers in thermally conductive composites.
研究领域:
材料科学
·
热管理技术
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2020
·
IF 8.758
Yaping Wang,Pingping Ding,Heng Xu,Qian Li,Junling Guo,Xuepin Liao,Bi Shi
Nowadays, X-rays are playing increasingly important roles in daily life and industrial manufacture, which calls for effective and mobile shielding materials. However, it seems to be a paradox to prepare shielding materials simultaneously achieving excellent X-ray attenuation properties and superior mechanical strength. Here, an advanced leather-based X-ray shielding material containing bismuth and iodine (BiINP-LM) is prepared, and the stable and well-dispersed loading of high-Z element components is enabled by favorable interactions between bismuth iodide and leather, i.e., coordination, hydrogen bonds, and electrostatic attractions. A piece of BiINP-LM with 1.00 mm thickness displays an excellent X-ray attenuation efficiency of more than 90% in the photon energy range below 50 keV and 65% at 83 keV, which averagely exceeds ∼3% than that of the 0.25 mm lead plate and ∼5% than that of the 0.65 mm commercial lead apron. Additionally, the coordination between bismuth and leather provides an enhanced tensile and tear strength of ∼10-fold and 3-fold compared with the lead apron. It is worth mentioning that BiINP-LM also displays extra high water-vapor permeability, which is ∼50-fold more than the lead apron. Overall, this work opens up a new prospect for preparing advanced X-ray shielding materials with both excellent X-ray attenuation and outstanding physiomechanical performances.
研究领域:
材料科学
·
辐射防护
✓ 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）