ENERGY
·
2021
·
IF 7.147
Hongyang Li,Chengzhi Hu,Yichuan He,Dawei Tang,Kuiming Wang,Xianfeng Hu
To further enhance the melting rate of the metal foam composite phase change material (MFCPCM), we took partial and gradient optimizations on the pore densities of metal foams. The partially optimized models, including Partial-80-5-5 and Partial-5-5-80, were compared with the Uniform-5 model. Results show that the Partial-80-5-5 model has the most developed melting among the three models. It illustrates that enlarging the pore density in the top region is conducive to accelerating the whole melting process. Besides, through a further comparison of the Partial-80-5-5, Partial-40-5-5, and Partial-20-5-5 models, we concluded that the larger the pore-density in the top region is, the faster the melting is. Subsequently, the gradient optimizations, including Gradient-80-20-5 and Gradient-80-40-5 models, were experimented with and analyzed. It was obtained that the Gradient-80-40-5 model has the fastest melting rate among all models. The inhibition of the large pore density on natural convection at the top and middle regions causes a strong vortex at the bottom region, so the melting process is significantly reinforced. Through the optimizations on the metal foam's pore density, the energy storage rate can achieve a prominent enhancement.
研究领域:
材料科学
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热能工程
✓ 已验证
产品关联
DOI
高影响因子
IN VITRO CELLULAR & DEVELOPMENTAL BIOLOGY-PLANT
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2021
·Vol. 57
·期 3
·372-379
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IF 2.252
Li Xiuyu,Zhang Zijie,Ren Yunhui,Feng Yue,Guo Qi,Dong Li,Sun Yuhan,Li Yun
Tetraploid black locust ( Robinia pseudoacacia L.) has advantages over diploid varieties in growth and stress resistance. Previous studies had shown that tetraploid black locust can be induced only by treating shoot tips of the germinating seeds with colchicine. In order to establish a simpler and more efficient tetraploid induction method in black locust, we induced tetraploid plants by treating the hypocotyls from in vitro –grown seedlings with different concentrations of colchicine, and then provided a method for tetraploid identification based on stomatal size and density in this study. The highest induction efficiency was 53.33% by treating hypocotyl explants with 70 mg·L −1 colchicine for 2 d. Tetraploid black locust was significantly different from diploid in morphological characteristics. Leaf area, leaf thickness, chlorophyll content, stomatal length, and stomatal width were greater in tetraploid plants than in diploid plants, whereas the opposite was true for leaf aspect ratio, stomatal index, and stomatal density. The differences in stomatal size and density between diploid and tetraploid were nearly two times; therefore, size and density of stomata can be used as a stable and distinct marker to rapidly screen tetraploids. The results of this study suggested that the hypocotyl was an ideal material to induce tetraploid black locust in vitro and confirmed that stomatal size and density could be an effective and reliable marker to identify ploidy level in black locust.
研究领域:
植物科学
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生物技术
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分子生物学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2025
·
IF 9.5
Xiao Wu,Canyu Zhong,Lian Ying Zhang,Jianguo Lu,Qinggang He,Qinghua Zhang,Weiyong Yuan,Chang Ming Li
Three-dimensional (3-D) hierarchical nanoporous graphene (NPG) is highly promising as an electrode material for high-performance supercapacitors, but its fabrication presents formidable challenges. For the first time, 3-D hierarchical NPG has been synthesized via M(RCOO)2·xH2O-mediated controllable self-assembly, in which the noncovalently bonded M(RCOO)2·xH2O simultaneously create metal oxide NPs to serve as spacers and CO2 and H2O as pore generators. The pore size and pore density in the basal planes can be tailored by varying the amount of M(RCOO)2·xH2O. These unique nanostructured graphenes are subsequently investigated as electrode materials for supercapacitors, exhibiting a highly tunable specific capacitance. The most outstanding one achieves a specific capacitance of 186 F g−1 at 0.5 A g−1, surpassing all reported graphene-based supercapacitors in the same electrolyte. In addition, it maintains 79.6% of the capacitance at 20 A g−1, revealing a superior rate performance compared to reported supercapacitors. Furthermore, no significant decrease in capacitance is observed even after 10 000 charge–discharge cycles, demonstrating excellent cycling stability. The ultrahigh capacitance and rate capability are ascribed to the 3-D hierarchical nanoporous structure of graphene with extremely rich edge sites remarkably increasing the surface area and promoting electron transfer and ion diffusion. This study not only presents an innovative strategy for synthesizing unique graphene-based materials with superior capacitive properties but also provides deep scientific insights into the self-assembly mechanism, which can be further extended to fabricate various other 3-D hierarchical nanoporous carbons for diverse important applications.
研究领域:
材料科学
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纳米技术
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电化学
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储能
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化学合成
✓ 已验证
产品关联
DOI
高影响因子
Advanced Composites and Hybrid Materials
·
2025
·Vol. 8
·期 4
·1-15
·
IF 21.8
Zhang Yunxiao,Zhao Hongchen,Ou Yunfu,Zhang Han,Yao Xudan,Mao Dongsheng
The strategy of interlaminar toughening shows tremendous potential in addressing delamination failure in glass fiber-reinforced polymer (GFRP) composites. In contrast to commonly used particulate or nanofibrous interleaves, mesh structures feature a more continuous and uniform architecture, which confers notable benefits in terms of scalability. Despite this potential, there is currently a lack of systematic studies on the role of mesh structures in interlaminar toughening. Therefore, this study investigates the interlaminar toughening behavior of polyamide (PA) mesh, known for its excellent mechanical properties, as an interlayer in GFRP, focusing on the effects of different mesh densities and thicknesses. Through different fracture tests and failure analyses, the correlation between mode I/II fracture behaviors and characteristic parameters of PA6 mesh was elucidated. The results indicate that by introducing the PA6 mesh, the mode I and mode II fracture toughness can be improved by 109% and 69%, respectively. This enhancement is attributed to the structural toughening effect of the PA mesh, including PA fiber bridging, plastic deformation, and fracture, as well as its ability to induce controlled crack deflection and guidance. Upon analysis, the primary factor influencing the toughening efficiency of the PA mesh is the mesh porosity. Only within an appropriate porosity range (20% ~ 60%) can the interlaminar toughening effect of the PA mesh be activated. Under this premise, thickness, as the secondary dominant factor, has a positive regulatory effect on the interlaminar fracture toughness of the PA intercalated laminates.
研究领域:
材料科学
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复合材料
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机械工程
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高分子科学
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断裂力学
✓ 已验证
产品关联
DOI
高影响因子
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