COMPOSITES PART B-ENGINEERING
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2016
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IF 3.85
Fei-Peng Du,Sui-Sui Xie,Fang Zhang,Chak-Yin Tang,Ling Chen,Wing-Cheung Law,Chi-Pong Tsui
Geopolymers have emerged as a promising alternative to ordinary cement due to their attractive physical and thermal properties. The typical compressive strength of geopolymers and their composites is usually limited to around 80 MPa, therefore they should be further strengthened for wider applications, such as ultrahigh strength concrete and bone replacement. This paper presents a facile method for enhancing the compressive strength by incorporating silicon carbide particles (SiC p ) and silicon carbide whiskers (SiC w ) into a geopolymer matrix via the geopolymerization of metakaolin (MK). The effects of the reinforcement of SiC p and SiC w on the microstructure, thermal properties and compressive properties of the composites were investigated. The SEM images showed that both SiC p and SiC w were well dispersed in the geopolymer matrix. Due to the bridging effect among the SiC w particles, the silicon carbide whisker/geopolymer (SiC w /GP) composites possessed higher porosity and lower density, and thus lower thermal stability and thermal conductivity as compared with the silicon carbide particle/geopolymer (SiC p /GP). The mechanical tests showed that the compressive strength of SiC p /GP composites increased with the increase of SiC p concentration. With an optimum concentration of 10 wt % of SiC p , the compressive strength of the composite was enhanced to 155 MPa, corresponding to a 100% increase as compared with the unfilled geopolymer.
研究领域:
材料科学
·
建筑工程
✓ 已验证
DOI
高影响因子
JOURNAL OF POLYMER RESEARCH
·
2025
·Vol. 32
·期 4
·1-18
·
IF 2.8
Liu Ziqun,Yu Yunwu,Yuan Yong,Jiang Bin,Liu Changwei,Wang Junhai,Li Ting,Liu Peng,Ma Ying,Fang Yanfeng,Sun Xiaowei
Based on previous studies, we prepared ultrafiltration membranes by cross-linking PEEKWC/PEI using a non-solvent induced phase separation method, this membrane has excellent hydrophilicity. We also incorporated silica (SiO 2 ) into the cross-linked membrane system through distribution blending in this study. The membranes underwent characterization using various methods including SEM, ATR-FTIR, and water contact angle tests. To assess the impact of silica addition on membrane performance, tests were conducted on pure water flux, dye flux, dye retention, salt solution flux, salt-dye mixed solution flux, and retention. The results indicated a noticeable improvement in the hydrophilicity of the membrane following the addition of silica, as evidenced by a reduction in the hydrophilic angle from 22.175° to 6.271°, pure water flux up to 850 LMH at 0.3 MPa. Moreover, the retention performance of the membrane was enhanced, with the Congo red solution reaching a retention rate of 99.9% at 0.3 MPa pressure. Subsequently, a fixed silica ratio was chosen (2wt%), and different ratios of silane coupling agent were added using the distribution blending method to explore their effects on membrane performance. The tests revealed an improvement in the retention performance, the group with the largest change in the Congo Red cut-off rate, with an increase in the Congo Red cut-off from 88.7% to 97.9%.
研究领域:
材料科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Chengzhi Xu,Lei Yang,Jieliang Su,Jianping Zhang,Jiakai Cao,Xiaodong Li,Gang He,Zhanggui Hu
Silicon nitride (Si 3 N 4 ) with α -phase content ∼90.0 wt% and oxygen content ∼1.00 wt% was prepared by combustion synthesis method using recycled silicon waste from photovoltaic industry. The effects of reaction pressure and environmentally-friendly new additive C 3 H 6 N 6 on the phase composition, and morphology and reaction mechanism of the combustion synthesized α -Si 3 N 4 powder were studied. The results indicate that a lower N 2 pressure is conducive to increasing the α -phase content and reducing the oxygen content of the Si 3 N 4 powder. The addition of C 3 H 6 N 6 as an effective additive facilitates the deoxidation and nitridation reactions of recycled silicon waste, which further increases the α -phase content and reduces the oxygen content of the Si 3 N 4 powder. This work demonstrated that the recycled silicon waste from photovoltaic industry holds great promise to be used as the silicon source for the cost-effective synthesis of high quality α -Si 3 N 4 powder.
研究领域:
材料科学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2025
·
IF 11.3
Zhiheng Wang,Shuxin Tu,Khurram Shehzad,Jingtao Hou,Shuanglian Xiong,Menghua Cao
Silicon is widely used as a "quality element" and "stress resistance element" in crop production and the remediation of heavy metal-contamination soils. Compared to inorganic silicon, organosilicon has unique properties such as amphiphilicity, low surface energy and high biocompatibility. Our previous research has confirmed the effectiveness of organosilicon-modified fertilizers in inhibiting Cadmium (Cd) absorption in wheat. Therefore, it is of great importance to further explore the potential mechanisms and comprehensive benefits of organosilicon. In this study, the microbiological and molecular mechanisms by which organosilicon reduces Cd concentration in wheat compared to inorganic silicon were investigated in depth. The findings indicated that, in comparison with inorganic silicon, organosilicon exhibited a more remarkable efficacy. Specifically, it was more effective in reducing the Cd concentration in wheat grains, achieving a reduction range of 35–39 % as opposed to the 23–28 % reduction achieved by inorganic silicon. Moreover, it manifested a greater ability to mitigate health risks, with a reduction range of 33–42 % compared to the 25–30 % reduction of inorganic silicon. Furthermore, organosilicon contributed to a significant increase in wheat yield, with a growth range of 11–14 % in contrast to the 8–11 % increase from inorganic silicon. Additionally, it enhanced the quality of the grains, substantially improving the protein content and amino acid content. The comparative advantages of organosilicon over inorganic silicon would be firstly due to the reduction of the bioavailability of soil Cd by increasing the available silicon content in the soil and improving the soil microbial ecology (increasing the abundance of Bacillus , Pseudomonas , Massilia and Talaromyces and reducing the enrichment of Fusarium ). Secondly, organosilicon achieved vacuolar compartmentalization of Cd by upregulating the expression of the ABC transporter gene ( TaABCB7 ), thereby alleviating Cd toxicity and restricting Cd transport from leaves to grains. Meanwhile, organosilicon increased the wheat yield by optimizing the availability of soil nutrients and enhancing photosynthesis. These results demonstrate the immense potential of organosilicon in mitigating heavy metal contamination in crops.
研究领域:
植物学
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环境科学
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分子生物学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Fang Di,Xin Gu,Yang Chu,Lixiang Li,Xin Geng,Chengguo Sun,Weimin Zhou,Han Zhang,Hongwei Zhao,Lin Tao,Guangshen Jiang,Xueyuan Zhang,Baigang An
Owing to highly theoretical capacity of 3579 mAh/g for lithium-ion storage at ambient temperature, silicon (Si) becomes a promising anode material of high-performance lithium-ion batteries (LIBs). However, the large volume change (∼300 %) during lithiation/delithiation and low conductivity of Si are challenging the commercial developments of LIBs with Si anode . Herein, a sandwich structure anode that Si nanoparticles sandwiched between carbon nanotube (CNT) and silicon carbide (SiC) has been successfully constructed by acetylene chemical vapor deposition and magnesiothermic reduction reaction technology. The SiC acts as a stiff layer to inhibit the volumetric stress from Si and the inner graphited CNT plays as the matrix to cushion the volumetric stress and as the conductor to transfer electrons . Moreover, the combination of SiC and CNT can relax the surface stress of carbonaceous interface to synergistically prevent the integrated structure from the degradation to avoid the solid electrolyte interface (SEI) reorganization. In addition, the SiC (1 1 1) surface has a strong ability to adsorb fluoroethylene carbonate molecule to further stabilize the SEI. Consequently, the CNT/SiNPs/SiC anode can stably supply the capacity of 1127.2 mAh/g at 0.5 A/g with a 95.6 % capacity retention rate after 200 cycles and an excellent rate capability of 745.5 mAh/g at 4.0 A/g and 85.5 % capacity retention rate after 1000 cycles. The present study could give a guide to develop the functional Si anode through designing a multi-interface with heterostructures .
研究领域:
材料科学
·
能源存储
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MATERIALS CHEMISTRY AND PHYSICS
·
2024
·
IF 4.3
Yonghui Yang,Hengwei Yan,Pengchen Yang,Zhanwei Liu,Guang Yang
The segregation of aluminum-silicon alloys directly impacts the mechanical and chemical properties of the alloys, Therefore, homogenization of alloys is of great significance for alloys. This study initially investigated the electrochemical behavior of aluminum (III) and silicon (IV) during the preparation of aluminum-silicon (Al-Si) alloys in NaF-AlF 3 -Al 2 O 3 -SiO 2 molten salts through cyclic voltammetry and steady-state polarization. The results revealed that Al 2 O 3 underwent one-step reduction to Al, whereas SiO 2 underwent a two-step reduction process to Si. In addition, electrolysis experiments were carried out in a NaF-AlF 3 -Al 2 O 3 -SiO 2 -5wt%CaF 2 -1wt%MgF 2 -2wt%LiF molten salt system with molecular ratio of 2.4. These experiments involved variations in current density, electrolysis time, Al 2 O 3 and SiO 2 additions. It is worth noting that under the conditions of current density of 0.7 A/cm 2 , electrolysis time of 2 h, and silica addition of 2 %, the reduction rate of silicon reached a maximum value of 72.57 %, at which time the silicon in the aluminum-silicon alloys showed a dendritic structure, which was uniformly distributed throughout the entire alloy, and the segregation of the alloy was effectively avoided.
研究领域:
材料科学
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电化学
✓ 已验证
产品关联
DOI
高影响因子
METALLURGICAL AND MATERIALS TRANSACTIONS B-PROCESS METALLURGY AND MATERIALS PROCESSING SCIENCE
·
2025
·
IF 3.1
Zhao Ya,Wu Jijun,Ma Wenhui
The study of diffusive mass transfer of impurity phosphorus (P) in silicon melts was a crucial aspect of achieving efficient deep P removal. To elucidate the mass transfer mechanism of P in silicon melts, this paper presents a kinetic analysis of impurity P removal from silicon melts. To minimize the effects of convection on diffusion, a capillary diffusion device was employed to conduct experimental investigations of P diffusion in silicon melts at different temperatures. According to slag–silicon refining experiments, the mass transfer process of P between the silicon melt and the slag phase was characterized and the mass transfer coefficient of P in the silicon melt was calculated. The experimental results indicated that the diffusion coefficients of P in silicon melt at 1450 °C, 1500 °C, and 1550 °C were 2.81 × 10 −8 , 3.24 × 10 −8 , and 3.91 × 10 −8 m 2 ·s −1 , respectively. Through the calculation of the activation energy for P diffusion, the relationship between the diffusion coefficient and temperature was determined as \(D=1.23\times {10}^{-5}\cdot {\text{e}}^{-\frac{\text{87,260}}{RT}}\) . At a refining temperature of 1550 °C, the mass transfer coefficient of P in the silicon melt was found to be 2.11 × 10 −5 m·s −1 when calcium silicate slag was used for slag refining. These findings provided essential kinetic data, including diffusion and mass transfer coefficients, to support the advanced removal of impurity P from metallurgical-grade silicon (MG-Si).
研究领域:
冶金工程
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
COMPOSITES SCIENCE AND TECHNOLOGY
·
2024
·
IF 8.3
Qiao Li,Hongda Meng,Yihu Song,Qiang Zheng
Silica is an important filler of “green tires” while its dispersion in the aid of silane coupling agents emits volatile organic compounds during rubber compounding and its invariably agglomeration in nonpolar rubber matrices enhances strain softening . Herein a highly active deep eutectic solvent (DES), synthesized using stearic acid as hydrogen bond donor and tetrabutylammonium chloride as hydrogen bond acceptor, is used to tailor reinforcement and softening behaviors and to replace the silane coupling agents for preparing volatile organic compounds-free nanocomposites . The results show that DES can regulate the crosslinking network structure of rubber matrix and accelerate the vulcanization by reacting with non-rubber components in natural rubber (NR) and by improving the proportion of disulfidic linkage. Furthermore, DES is able to improve the dispersion of silica, crosslinking density of NR and the interfacial interaction between silica and NR, and slow down the thermo-oxidative aging behavior. It could also weaken the damping and softening accompanying Mullins effect for the nanocomposites vulcanizates at high strains. In comparison with silane , DES endows the nanocomposites with superior vulcanization and mechanical properties, providing guides to mediate the reinforcement and strain softening behaviors and manufacture high-performance “green tires” in an energy-efficient approach.
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
Nature Sustainability
·
2024
·
IF 25.7
Liu Tao,Dong Tiantian,Wang Mengying,Du Xiaofan,Sun Youlong,Xu Gaojie,Zhang Huanrui,Dong Shanmu,Cui Guanglei
Silicon (Si) anode is widely viewed as a game changer for lithium-ion batteries (LIBs) due to its much higher capacity than the prevalent graphite and availability in sufficient quantity and quality. Most Si anode designs are nanostructured to overcome the large volume variation during cycling, but this comes at the expense of manufacturability, cost advantage and other merits. Here we demonstrate that micro-sized Si (μm-Si) recycled from photovoltaic waste can serve as anode material, exhibiting an average Coulombic efficiency of 99.94% and retaining 83.13% of its initial capacity after 200 cycles through the rational electrolyte design. With a formulated ether electrolyte of 3 M LiPF 6 in 1,3-dioxane (DX)/1,2-diethoxyethane (DEE), NCM811||μm-Si pouch cells survive 80 cycles and deliver an energy density of 340.7 Wh kg −1 even under harsh conditions. Responsible for the impressive electrochemical performance is a unique SEI chemistry where the flexible polymer-dominated outer layer well holds fractured Si particles together and the rigid Li 2 O/LiF-rich inner layer serves to facilitate ionic conduction and suppress side reactions. Our work not only suggests a more sustainable supply source for Si particles but also addresses the major problems facing μm-Si anode materials.
研究领域:
材料科学
·
能源存储
·
可持续发展
✓ 已验证
产品关联
DOI
高影响因子
PROGRESS IN ORGANIC COATINGS
·
2024
·
IF 6.5
Quan Yuan,Liwei Yan,Jinfeng Tian,Yang Chen,Huawei Zou
With the development of the new generation space vehicles, traditional phenolic resin (PR)-based coatings are no longer able to meet the increasingly harsh thermal environment. There is an urgent need to develop higher performance PR to ensure the flight safety of aircraft. Therefore, in this work, a novel hyperbranched polysiloxane containing Si-O-Zr bond was synthesized and then introduced into PR to develop homogeneous silicone/phenolic hybrid resin coatings. The TG results indicate that the introduction of Si-O-Zr bonds significantly improves the heat resistance of silicone. During ablation, the hyperbranched polysiloxane will undergo a ceramization to produce SiO 2 and ZrO 2 particles, both of which will subsequently generate a highly viscous Zr-Si-O glassy phase as anti-ablation layer. With the fluidity and self-healing properties, it can fill the gaps of the carbon layer and cover the surface of the carbon layer, giving the hybrid resin excellent ablative resistance. The linear ablation rate of the hybrid resin can be as low as 0.003 mm/s, which is an 80 % decrease compared to pure PR. The synthesized hybrid resin is expected to act as superior thermal protection coatings for the next generation of spaceflight.
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
REACTIVE & FUNCTIONAL POLYMERS
·
2024
·
IF 4.5
Ting Pan,Hao Wu,Zhiqiang Guan,Xiaofei Zhu,Yingqian Hu,Linxuan Fang,Yongbing Pei,Lianbin Wu
Octaglycidyldimethylsilyl polyhydric silsesquioxane (OG-POSS) in coordination with tetraethyl orthosilicate, tetrapropyl orthosilicate and tetrabutyl orthosilicate mixed solution was applied to the bonding of metal substrate and silicone resin thermal protective coating. The influence of OG-POSS addition on the interface of primer was systematically investigated by means of scanning electron microscope (SEM), salt spray test, thermogravimetric infrared spectroscopy (TGA-IR) and back temperature test. Results showed that the addition of OG-POSS favored the formation of a silane film of the primer, resulting in a more compact and continuous film. At the same time, the silane film had excellent corrosion resistance and adhesion, with a maximum adhesion strength of about 1.42 MPa. In addition, OG-POSS provided a unique Si-O-Si cage structure in the primer, which improved the ablation resistance of the interface layer, preventing the degradation and peeling of the coating in harsh environments.
研究领域:
材料科学
·
表面工程
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2021
·
IF 4.527
Jian Meng Jiao,Kai Tang,Jafar Safarian,Bettina Grorud,Kathrine Sellevoll,Merete Tangstad
Si 3 N 4 is a candidate crucible material for Si–B alloys in high temperature thermal energy storage system. In this regard, the phase formation in the Si–B alloys and the interaction between the alloys and Si 3 N 4 were investigated in an induction furnace at 1750 °C with the B addition of 2, 5, 8, and 11 mass %, respectively. Moreover, the wettability property of the Si-3.25B alloy (mass %) on Si 3 N 4 substrate was examined at temperatures up to 1400 °C. The cross-sectional images and micro-analyses showed that BN precipitates were produced in the Si–B alloys and a BN layer was formed at the interface between the Si–B alloys and Si 3 N 4 . However, the amount of BN precipitates was negligible. Next, the equilibrium contact angle of liquid Si-3.25B alloy on Si 3 N 4 substrate was determined to be 134 ± 1°, which indicates non-wetting behavior. The above results support that Si 3 N 4 is a desirable refractory material for the high temperature thermal energy storage system.
研究领域:
材料科学
·
能源工程
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）