JOURNAL OF APPLIED POLYMER SCIENCE
·
2017
·Vol. 134
·期 47
·45544
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IF 1.86
Chengzhen Geng,Qian Zhang,Weihua Lei,Fengmei Yu,Ai Lu
Silica is the most widely-used filler to reinforce liquid silicone rubber (LSR), but the high viscosity of LSR/silica suspension significantly limits its processing flexibility. To balance the processibility and reinforcing efficiency of LSR/silica systems, two kinds of enols (propenol and 1-undecylenyl alcohol) and a saturated alcohol (1-undecylic alcohol) were employed to modify the silica surface. Various rheological tests were carried out to investigate the processibility as well as filler networking and crosslinking processes of the modified systems. Tensile tests were also adopted to verify the reinforcing effect. It was found that surface modification of silica by 1-undecylenyl alcohol could significantly reduce the viscosity of its suspension with LSR. Meanwhile, the mechanical strength of LSR could be largely enhanced by six times with 10 wt % modified silica. This work will merit design and production of LSR materials with balanced processibility and mechanical performance. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017 , 134 , 45544.
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 Nanomaterials
·
2014
·
IF 1.611
Jiancheng Wang,Zhaoliang Peng,Bing Wang,Lina Han,Liping Chang,Weiren Bao,Gang Feng
A series of manganese salts (Mn(NO3)2, MnCl2, MnSO4, and Mn(Ac)2) and silicon materials (silica sand, silica sol, and tetraethyl orthosilicate) were used to synthesize Mn/Si complexes in supercritical water using a tube reactor. X-ray diffraction (XRD), X-ray photoelectron spectrometer (XPS), transmission electron microscopy (TEM), and scanning electron microscopy (SEM) were employed to characterize the structure and morphology of the solid products. It was found that MnO2, Mn2O3, and Mn2SiO4 could be obtained in supercritical water at 673 K in 5 minutes. The roles of both anions of manganese salts and silicon species in the formation of manganese silicon complexes were discussed. The inorganic manganese salt with the oxyacid radical could be easily decomposed to produce MnO2/SiO2 and Mn2O3/SiO2. It is interesting to found that Mn(Ac)2 can react with various types of silicon to produce Mn2SiO4. The hydroxyl groups of the SiO2 surface from different silicon sources enhance the reactivity of SiO2.
研究领域:
化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
Materials
·
2016
·Vol. 9
·期 9
·723
·
IF 2.728
Guangwu Zhang,Fuzhong Wang,Zhixiong Huang,Jing Dai,Minxian Shi
Montmorillonite (MMT) was added to silicone rubber (SR) to improve the ablation resistance of the silicone. Following this, different quantities of silicon carbide whiskers (SiCw) were incorporated into the MMT/SR to yield a hybrid, ablative composite. The tensile strength and elongation at break of the composite increased after the addition of MMT. The ablation test results showed that MMT helped to form a covering layer by bonding with the silica and other components on the ablated surface. The linear and mass ablation rates exhibited decreases of 22.5% and 18.2%, respectively, in comparison to a control sample. After further incorporation of SiCw as the second filler, the resulting composites exhibited significantly higher tensile strength and ablation resistance, but not particularly lower elongation at break in comparison to the control sample. The SiCw/MMT fillers were beneficial in forming a dense and compact covering layer that delayed the heat and oxygen diffusion into the inner layers, which improved the ablation properties effectively. The remaining whiskers acted as a micro skeleton to maintain the composite’s char strength. Compared to the control sample, the linear and mass ablation rates of the composite after incorporating 6 phr SiCw and 10 phr MMT decreased by 59.2% and 43.6%, respectively. These experimental results showed that the fabricated composites exhibited outstanding mechanical properties and excellent ablation resistance.Keywords:silicone rubber;ablation resistance;mechanical properties;montmorillonite;silicon carbide whisker
研究领域:
材料科学
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航空航天工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
POLYMER
·
2020
·
IF 4.231
Yuqi Xiong,Simin Shen,Ming Kang,Zhiyong Wang,Ai Lu
The Silica filler has been successfully fluorescently labeled by bifunctional silane coupling agent and europium nitrate through chemical grafting method. The thermal weight loss of the labeled silica at 200 °C was 1.75%, which was lower than 3.57% before labeling. This indicated that the labeled material had good thermal stability below 200 °C, and the water content of the labeled filler decreased due to its reduced hydrophilicity on the surface of the filler. Polysiloxane was filled with labeled or unlabeled silica which had different filler loading levels (from 10 phr to 60 phr) by diluted mixing on the purpose of investigating effect of fluorescent labeling on the mechanical property of rubber composite. According to the results of laser confocal microscope 3D imaging and software calculation, the network connection rate increased from 23% to 60% with the increase of filling amount. When the filling contents are more than 40%, the mechanical properties of unlabeled silica filled silicone rubber decrease slightly, while the mechanical properties of labeled silica filled silicone rubber almost remain unchanged, which is related to the increase interaction of filler and matrix through organic functionalization on the surface of the latter. However, the influence trend of fillers on mechanical properties of the two systems is basically the same. Fluorescent labeled silica is expected to be an effective tool for the correlation between microstructure and mechanical properties.
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
JOM
·
2021
·Vol. 73
·期 12
·3727-3733
·
IF 2.474
Yang Jiaxin,Tao Wenju,Chen Liyu,He Jingui,Zhang Yifan,Yu Jiangyu,Wang Zhaowen
The preparation of high-purity and high-value alloys is of great significance to industrial production. The purpose of this study is to explore the process of producing aluminum-silicon (Al-Si) alloy by the electrochemical Al-Si eutectoid method. The electrochemical behavior of aluminum and silicon on tungsten electrode was studied by cyclic voltammetry and galvanostatic chronopotentiometry. The effect of SiO 2 addition on the eutectoid behavior of Al and Si was studied. The results show that the precipitation potential of Al is about –1.35 V (versus Pt), and the initial precipitation potential of Si is about –0.8 V (versus Pt). The precipitation process of silicon includes two reduction stages. In addition, the precipitation of Si is a quasireversible reaction controlled by diffusion process. Finally, Al-Si alloy was obtained by potentiostatic electrodeposition at –1.8 V potential, indicating that Al and Si would codeposit at this potential.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Gangan Wang,Chaoyi Chen,Junqi Li,Xin Lin,Haonan Zheng
Calcium-silica slag (CSS) is a highly alkaline residue, rich in calcium, generated during the chemical pre-desilication process of medium- and low-grade bauxite. Mismanagement of CSS can result in detrimental environmental impacts. This study developed a novel method that combines CO 2 sequestration with CSS utilization, thereby achieving simultaneous dual-value enhancement of CSS and eliminating waste discharge. Under optimized Ca 2+ leaching and carbonation conditions, a remarkable Ca 2+ extraction efficiency of 96.93 % was attained, while the carbonation efficiency reached 99.37 %. Consequently, this process sequestered 301.7 kg of CO 2 per ton of CSS. The leaching process of Ca 2+ in NH 4 Ac solution was realized based on the unreacted shrinking core model, which accounts for internal diffusion and chemical reaction as factors influencing leaching. The resulting carbonated product exhibited outstanding characteristics: high-purity vaterite composed of 97.43 wt% CaCO 3 with a whiteness level of 95.2 %. By regulating the carbonation temperature, the crystal particulate size distribution of CaCO 3 was tailored to meet specific requirements for various applications. Furthermore, silicon content was enriched in the leaching residue, increasing the effective SiO 2 content from 25.2 wt% to 53.12 wt% and reducing the pH from 12.23 to 7.34, rendering it a suitable silica fertilizer for agricultural production.
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
POLYMER BULLETIN
·
2018
·Vol. 76
·期 4
·1807-1824
·
IF 1.589
Ji Chunda,Chen Xiao,Li Fengfu,Yun Zhi
Double methyl oleate (MO) capping agent (MO-MM-MO) was prepared by hydrosilylation, from MO and tetramethyldisiloxane (HMMH). The structure was characterized by IR spectrum. By investigating the effects of different catalysts and reaction conditions on the hydrosilylation conversion, the H 2 PtCl 6 ·6H 2 O/isopropanol solutions was selected as catalyst, and the optimal reaction conditions were determined. The double MO-terminated polysiloxane (MOM-D n -MMO) with different degree of polymerization (DP) was prepared via octamethylcyclotetrasiloxane (D 4 ) ring opening polymerization, with MO-MM-MO terminated. The effects of DP on the performance of MOM-D n -MMO were studied. With the increase in DP, the viscosity–temperature performance of product gradually increases, and it remained basically unchanged, when the DP was 60 or more. For the lubrication performance, as the DP increased, the product lubrication performance improved gradually, and compared with polydimethylsiloxane (M-D n -M), the lubrication performance of MOM-D n -MMO was also more excellent. The products with large DP had good thermal stability, also. In addition, the effects of product on the mineral oil performance were also investigated. The MOM-D 40 -MMO was good compatible with mineral oil, and the lubrication performance of mineral oil with MOM-D 40 -MMO was also improved, due to the presence of MO.
研究领域:
材料科学
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化学工程
·
高分子化学
✓ 已验证
产品关联
DOI
高影响因子
Nanomaterials
·
2023
·Vol. 13
·期 3
·467
·
IF 5.3
Bingjie Ma,Yingying Cheng,Peiying Hu,Dan Fang,Jin Wang
Silica aerogels are one of the most widely used aerogels, exhibiting excellent thermal insulation performance and ultralow density. However, owing to their plenitude of Si-O-Si bonds, they possess high infrared emissivity in the range of 8–13 µm and are potentially robust passive radiative cooling (PRC) materials. In this study, the PRC behavior of traditional silica aerogels prepared from methyltrimethoxysilane (MTMS) and dimethyldimethoxysilane (DMDMS) in outdoor environments was investigated. The silica aerogels possessed low thermal conductivity of 0.035 W/m·K and showed excellent thermal insulation performance in room environments. However, sub-ambient cooling of 12 °C was observed on a clear night and sub-ambient cooling of up to 7.5 °C was achieved in the daytime, which indicated that in these cases the silica aerogel became a robust cooling material rather than a thermal insulator owing to its high IR emissivity of 0.932 and high solar reflectance of 0.924. In summary, this study shows the PRC performance of silica aerogels, and the findings guide the utilization of silica aerogels by considering their application environments for achieving optimal thermal management behavior.Keywords:silica aerogel;methyltrimethoxysilane;dimethyldimethoxysilane;thermal insulation;radiative cooling;thermal management
研究领域:
材料科学
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热能工程
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能源材料
✓ 已验证
产品关联
DOI
PubMed
高影响因子
RARE METALS
·
2025
·
IF 11
Liu Lang,Zhang Qian,Han Guangrui,Zhang Mengjie,Song Xinyu,Xiao Hong,Hou Linrui,Jiang Ruiyu,Yuan Changzhou
Si, as the most promising anode with high theoretical capacity for next-generation lithium-ion batteries (LIBs), is hampered in commercial application by its poor electrical conductivity and significant volume expansion. Herein, the core-shell Si@SiO x /C@C-Ar (SSC-A) or Si@SiO x /C@C-H 2 /Ar (SSC-H) composites are purposefully designed by in situ introduction of inorganic SiO x in pure Ar or H 2 /Ar atmosphere to realize a Si-based anode for LIBs. By introducing different atmospheres, the valence states of SiO x are regulated. The inorganic transition layer formed by the combination of SiO x with higher average valence and asphalt-derived carbon demonstrates better performance in both stabilizing the core-shell structure and inhibiting the agglomeration of Si particles. Given these advantages, the SSC-A electrode exhibits excellent electrochemical performance (1163 mAh g −1 after 400 cycles at 1 A g −1 ), and the commercial blended graphite-SSC-A electrode reaches a specific capacity of 442 mAh g −1 with 74.8% capacity retention under the same conditions. Even the SSC-A electrode without Super P maintains an ultrahigh discharge specific capacity of 803 mAh g −1 with 60.6% after cycling. Importantly, the full batteries based on SSC-A without Super P achieve a discharge specific capacity of 126 mAh g −1 with 28.2% capacity decay after 200 cycles, demonstrating the superior commercial application potential.
研究领域:
材料科学
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能源技术
✓ 已验证
产品关联
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2012
·
IF 2.237
Xiao Chen,Miao Li,Jingchao Guan,Xinkui Wang,Christopher T. Williams,Changhai Liang
Nickel–silicon intermetallics have been prepared by a direct silicification method using SiH4 as the silicon source. The prepared nickel–silicon intermetallics were characterized by X-ray diffraction, transmission electron microscopy, temperature-programmed reduction, temperature-programmed desorption, X-ray photoelectron spectroscopy, and CO chemisorption measurements. The catalytic hydrogenation of cinnamaldehyde and phenylacetylene over the nickel–silicon intermetallics was investigated. Nickel–silicon intermetallics presented much higher selectivity to the intermediate product (hydrocinnamaldehyde) than monometallic nickel catalyst, which may be attributed to the repulsive force between the electronegative silicon atoms in the nickel–silicon intermetallics and oxygen atoms in the C═O bond of cinnamaldehyde. In addition, nickel–silicon intermetallics showed excellent selectivity for the hydrogenation of phenylacetylene to styrene (ca. 93%) due to the strong modification of the electronic structure derived from the interaction of nickel and silicon.
研究领域:
催化化学
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材料科学
✓ 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
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能源存储
·
可持续发展
✓ 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
·
环境科学
·
分子生物学
✓ 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）