PROGRESS IN ORGANIC COATINGS
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2022
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IF 6.206
Guojing Chen,Wenyu Fu,Zhiqiang Liu,Hao Wei,Zhijia Zhang,Guojun Wang,Songsong Zhang,Qiang Wang,Rui Li,Xiao Ouyang
Fuel leakage accidents of storage facilities and pipelines are one of greatest threats to the environment, life safety and economics. Appling self-sealing coating to pipe surface is an economical and effective method to prevent the fuel leakage. In this work, the high oil-absorption resin was designed and synthesized by suspension polymerization . The oil-absorption performance and oil-absorption volume expansion ratio of the high oil-absorption resin for gasoline, kerosene, and diesel were characterized, respectively. The saturated absorption rate of the high oil-absorption resin for gasoline reached 11.14 g/g, and the volume of the high oil-absorption resin expanded to 6 times when the absorption was saturated. The outstanding oil/water separate property of the high oil-absorption resin illustrated the adsorptive selectivity and the potential application of them for pipelines protecting in ocean. The high oil-absorption resin, as a functional filler to the polyurethane resin , exhibited excellent expanding in volume performance to seal the hole of the composite coating . The composite coating with 25 wt% of the high oil-absorption resin sealed a hole of 1.5 mm in diameter in 1 min. As the bottle with filled by kerosene was perforated by a needle with 3 mm in diameter, the composite coating with 25 wt% of the high oil-absorption resin was successfully instantaneous sealed the leak.
研究领域:
材料科学
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环境科学
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DOI
高影响因子
Journal of Materials Chemistry A
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2024
·Vol. 12
·期 9
·5377-5391
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IF 10.7
Siyu Guo,Yanzhi Cai,Laifei Cheng,Shaohua Huang,Tingting Liu,Haiming Yu,Dengpeng Chen,Yuhan Wang,Zhongyi Hu,Yuan Zhou
The design of laminated structures is important for tuning the performance of microwave absorbing materials with integrated structures and functions, but still faces great challenges. Herein, a self-sealing layered structure that integrates a laminated structure and a self-sealing structure is proposed. In this work, CNT buckypaper (BP) was first helically convolved to obtain a three-dimensional (3D) self-sealing layered fiber. Subsequently, 3D CNT BP/silicon carbide (CNT BP/SiC) self-sealing layered (CSSL) substrates, i.e., fiber, monolithic fiber and twisted fiber structures, were prepared by changing the self-sealing layered fiber arrangement methods. Meanwhile, the impedance matching of the CSSL substrates was improved by using the SiC nanowire (SiCnw) porous film as a cladding layer. The synergistic effect of good impedance matching and the self-sealing layered structure endowed the CSSL substrates clad with SiCnw porous film (CSSLS) composites with excellent microwave attenuation properties. The minimum reflection loss values for the CSSLS with fiber, monolithic fiber and twisted fiber structures were −49.35, −50.77 and −55.02 dB respectively, and the corresponding maximum effective absorption bandwidths were 3.50, 3.50 and 3.99 GHz, respectively, in the X-band. The twisted fiber structure, which had the most complex structure, had the best microwave absorption properties.
研究领域:
材料科学
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电磁学
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DOI
高影响因子
CONSTRUCTION AND BUILDING MATERIALS
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2025
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IF 8
Honglei Chang,Xiuyu Liu,Zhengkun Guo,Feng Guo,Jian Liu
Concrete, a widely utilized construction material, is prone to micro-cracking due to external loads and environmental factors, leading to water infiltration and structural deterioration. Conventional repair methods are time-consuming, whereas self-healing mechanisms typically necessitate prolonged durations to become effective. This study investigates the self-sealing performance of concrete blended with novel water-absorbent capsules containing superabsorbent polymers (SAP). The capsules were designed to prevent premature SAP expansion during the mixing and curing stages, thereby enhancing the material's self-sealing capability upon crack formation. The research evaluated the capsules' waterproofing performance, expansion characteristics, and dispersion, followed by permeability tests on concrete specimens with through-cracks. The effects of multiple factors, including capsule dosage, SAP content, water-cement ratio (w/c), and different molding methods (cast-molded and press-molded), were examined. The results demonstrated that double-walled capsules containing 5 % SAP achieved the optimal balance of waterproofing and swelling behavior. Compared to other mixtures, press-molded concrete incorporating 5 % capsules and 7 % SAP showed the most robust self-sealing capacity, reducing permeability by up to 55.2 % over 60 min and 95.7 % over 540 min separately, significantly outperforming cast-molded specimens, which showed a maximum reduction of 65.1 %. X-ray Computed Tomography (XCT) analysis confirmed that the SAP within the capsules absorbed water and expanded, filling cracks and reducing crack volume by 12.6 % when exposed to a 5 % CsCl solution. These findings highlight the potential of water-absorbent capsules as an effective strategy for autonomous crack sealing in concrete structures. The press-molded method, in particular, provides better control over capsule breakage and SAP release, leading to more effective and prolonged sealing performance.
研究领域:
建筑材料
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土木工程
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结构工程
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智能材料
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可持续建筑技术
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DOI
高影响因子
Small Methods
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2024
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IF 10.7
Chao Wan,Longyu Yi,Huijuan Yuan,Shunji Li,Xin Wang,Yuxiao Shu,Han Xie,Mengcheng Lei,Zeyu Miao,Wei Du,Xiaojun Feng,Yiwei Li,Peng Chen,Bi-Feng Liu
In microbiological research, traditional methods for bacterial screening and antibiotic susceptibility testing are resource-intensive. Microfluidics offers an efficient alternative with rapid results and minimal sample consumption, but the demand for cost-effective, user-friendly platforms persists in communities and hospitals. Inspired by the Magdeburg hemispheres, the strategy adapts to local conditions, leveraging omnipresent atmospheric pressure for self-sealing of Rotation-SlipChip (RSC) equipped with a 3D circular Christmas tree-like microfluidic concentration gradient generator. This innovative approach provides an accessible and adaptable platform for microbiological research and testing in diverse settings. The RSC can avoid leakage concerns during multiple concentration gradient generation, chip-rotating, and final long-term incubation reaction (≥24 h). Furtherly, RSC subtypes adapted to different reactions can be fabricated in less than 15 min with cost less than $1, the result can be read through designated observational windows by naked-eye. Moreover, the RSC demonstrates its capability for evaluating bacterial biomarker activity, enabling the rapid assessment of β-galactosidase concentration and enzyme activity within 30 min, and the limit of detection can be reduced by 10-fold. It also rapidly determines the minimum antibiotic inhibitory concentration and antibiotic combined medications results within 4 h. Overall, these low-cost and user-friendly RSC make them invaluable tools in determinations at previously impractical environment.
研究领域:
微生物学
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生物技术
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医学诊断
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药学科学
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DOI
PubMed
高影响因子
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