JOURNAL OF ELASTOMERS AND PLASTICS
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2021
·
IF 1.833
Mingchao Li,Yi Wang,Chunhui Shen,Shanjun Gao
Flame retardant thermoplastic elastomer (TPE) with excellent mechanical properties and thermal oxidative aging resistance was prepared by dynamic vulcanization technology with ethylene-octene copolymer (POE) and polypropylene (PP) as raw materials. The paper first discussed the effect of the amount of vulcanizing agent on the properties of PP/POE TPE. Based on the study of tensile strength, elongation at break, cross-section morphology, processability and aging properties of TPE, it was found that the TPE prepared with 0.6 phr of bis(1-(tert-butylperoxy)-1-methylethyl)-benzene (BIPB) and 40/60 of PP/POE had the best properties. Then silicone powder (GM) is added to the traditional low-halogen bromine-phosphorus flame retardant system for flame retardant modification. The results show that the addition of GM can effectively enhance the stability of the carbon layer, prevent the material from dripping during combustion, and increase the residual carbon content of TPE at 800°C. When 3 phr of GM is combined with a bromine-phosphorus system. The comprehensive performance is the best, the limiting oxygen index (LOI) of TPE increased to 29.8%, reaching the V-0 level. At the same time, the processing fluidity and aging resistance of TPE materials have also been improved.
研究领域:
材料科学
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高分子化学
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产品关联
DOI
高影响因子
Coatings
·
2021
·Vol. 11
·期 7
·850
·
IF 2.881
Kaixin Fu,Yi Li,Xiumin Chen,Wenhui Ma,Ziheng Yang,Tong Wang,Jiasen Liu,Zhuang Ma,Ran Chen,Xiuhua Chen,Shaoyuan Li
In this study, amino group surface-functionalized porous silicon adsorbent was successfully prepared for the first time using diamond wire saw silicon powder (DWSSP) as raw material through copper-assisted chemical etching (Cu-ACE) and organic functional group grafting. Amino-functionalized porous silicon adsorbent (TEPA-GTS-NPSi) can be used for removing As(V) from water. The properties and mechanism of the new adsorbent were characterized by infrared spectroscopy (FT-IR), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (FE-SEM), Brunauer–Emmett–Teller analysis (BET), and thermogravimetric analysis (TGA). The concentration of metal ions in the solution was determined by inductively coupled plasma spectrometry. Meanwhile, the effects of initial pH, adsorption time, initial concentration and adsorbent dosage on the removal of As(V) in an aqueous solution were studied by intermittent adsorption experiments. The results showed that the adsorption equilibrium could be reached rapidly after 30 min soaking. Under the optimized pH of 7, the maximum adsorption capacity was 13.2 mg/g, and the minimum adsorption limit was 3 mg/L. The adsorbent shows good adsorption performance after five successive regenerated cycles. Based on the density functional theory (DFT) analysis results, the adsorption mechanism is attributed to hydrogen bond interaction between the NH2group and As(V) ions.Keywords:silicon cutting powder;copper-assisted chemical etching;surface modification;waste recycling;arsenic removal
研究领域:
环境科学
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材料科学
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DOI
高影响因子
MATERIALS CHEMISTRY AND PHYSICS
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2020
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IF 3.408
Ruiqi Ma,Jiahui Shi,Wenxin Lin,Jianjun Chen
This paper reports a simple route to synthesize nanocrystalline silicon carbide (SiC) ceramic powders via the direct reaction of silicon powders with carbon black in a temperature-programmed muffle furnace. The mixing powders of silicon and carbon black were loaded in a alumina crucible, and then the crucible was sealed with some materials to prevent oxidization. The effect of reaction temperature on the phase of the product powders was investigated. FESEM and TEM images showed that the SiC nanopowders were spherical and had an average particle size of 48.56 nm. The sintering activities of the SiC nanopowders and commercial SiC fine powders were also investigated by hot-pressing sintering. SiC nanoceramic sintered at 1850 °C exhibited a high relative density (up to 99.2%) and a high flexural strength of 580 MPa, which exhibits better sintering activity of synthesized SiC nanopowders.
研究领域:
材料科学
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纳米技术
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产品关联
DOI
高影响因子
Materials Today Communications
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2024
·
IF 3.7
Yuqi Zhang,Zimu Zhang,Weixuan Chen,Xiang Zhang,Zisheng Guan
To enhance the performance of lithium-ion battery anodes, this study leverages recycled diamond wire-cut silicon particles, a byproduct of the photovoltaic sector. These particles undergo purification through acid wash and pyrolysis to eliminate contaminants, thereby serving as potential anode materials . The inherent challenge with silicon involves its significant volumetric expansion during lithiation and delithiation , which hampers its viability for commercial applications. Addressing this, the research introduces a facile approach by synthesizing porous silicon (pSi) via the Ag-assisted chemical etching method. Subsequently, a distinctive yolk-shell porous silicon@void@carbon (pSi@V@C) structure is created using a sacrificial template approach, ensuring the formation of voids between the porous silicon core and the carbon shell. This configuration mitigates the detrimental effects of silicon's volume expansion while enhancing electrical conductivity through the carbon shell. The pSi@V@C composite exhibits promising electrochemical performance, demonstrated by an initial discharge capacity of 1826 mAh g -1 and a Coulombic efficiency of 68.6% at 0.1 A g -1 . Remarkably, it maintains a capacity of 821.8 mAh g -1 after 550 cycles at 1 A g -1 , with a retention rate of 90.4%.
研究领域:
材料科学
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能源技术
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产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2019
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IF 4.175
Shuang Yin,Lin Guo,Limei Pan,Shengchang Yan,Handan Qiao,Shiduo Zhang,Jinqiong Tang,Huihua Min,Tai Qiu,Wei Wan,Jian Yang
Porous fused silica ceramics were successfully prepared by gelcasting using N, N–dimethylacrylamide (DMAA) as gelling agent and multigrade powders as starting materials. The results suggest that the ratio of fine–grained to coarse–grained mixed powders, solid loading and sintering temperature were highly correlated with microstructure and properties of fused silica ceramics. When the ratio was 0.8 and solid loading was 80 vol%, the resulting slurries had a relatively high viscosity, which ensured the excellent homogeneity and stability of slurries, ultimately endowing fused silica ceramics desirable microstructure and properties. As sintering temperature increased from 1225 °C to 1300 °C, the bulk density (1.78–2.05 g/cm 3 ) and linear shrinkage (1.98–4.23%) were increased, but the flexural strength was only enhanced within 1275 °C with a maximum of 20.69 MPa, since excess fused silica crystallized into cristobalite at 1300 °C, which deteriorated mechanical properties .
研究领域:
材料科学
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陶瓷工程
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产品关联
DOI
高影响因子
RESEARCH ON CHEMICAL INTERMEDIATES
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2021
·Vol. 47
·期 1
·77-90
·
IF 2.914
Shen Bin,Dong Chencheng,Yang Bo,Xing Mingyang,Zhang Jinlong
Abstract A novel defect-induced inorganic photoluminescence powder silica (CSI-SiO 2 ) nanomaterial was successfully synthesized via a facile method, where Cs + was doped into SiO 2 by ion exchange, and oxygen vacancy defects were produced during a vacuum calcination treatment at high temperature. CSI-SiO 2 was characterized by scanning electron microscopy, X-ray diffraction and photoluminescence spectroscopy. The result showed that CSI-SiO 2 contained merely three elements including Cs, Si, and O. Compared with conventional fluorescent materials, the preparation method of fluorescent material (CSI-SiO 2 ) didn’t need the precursor of heavy metals, rare earth metals and other harm contents, making it capable to be an environmentally friendly candidate. More importantly, CSI-SiO 2 exhibited hyper-stable photoluminescence performance in harsh conditions including strong acidic, weak alkaline, moist and high temperature conditions, which can be applied in security marking. Graphic abstract The mechanism diagram of material CSI-SiO2 for defect-induced photoluminescence.
研究领域:
材料科学
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光学
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产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2018
·
IF 3.057
Jia Hongsheng,Li Jiaqi,Niu Rui,Ye Chaochao,Ru Hongqiang,Liu Baochang,E. Yuanlong,Li Haibo
In this work, the Silicon nitride composite ceramics (β-Si 3 N 4 ) by ultra-high pressure sintering were investigated. And the effect of sintering temperature , hold time and α-Si 3 N 4 powders on the sintering process had been analyzed in detail. These experimental results showed the larger particle size and lower porosity had an obvious effect on the thermal conductivity . Meanwhile, the addition of α-Si 3 N 4 powder could be also attributed to thermal conductivity. We had been calculated the porosity of β-Si 3 N 4 composite ceramics that the sample D (0.26%) was lower than the others samples. For a comparison, the thermal conductivity of sample D was up to 64.6 W/m K that was also attributed to its higher diffusion rate and small grain size.
研究领域:
材料科学
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热传导工程
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产品关联
DOI
高影响因子
Materials Today Physics
·
2021
·
IF 9.298
W. Wei,B. Dong,L. Cao,W. Wang
Structural color materials have attracted extensive attention due to their fadeless color, low toxicity and environmentally friendly features, but the colors based on photonic crystal structures are usually angle-dependent on incident lights. In this research, we have fabricated a powder material with three-dimensional ordered macropores (3DOM) structure of silica (SiO 2 ) by a scarified template method . The micron-sized 3DOM SiO 2 powders can diffract lights in certain wavelengths and exhibits vivid structural colors. The structural colors from the 3DOM SiO 2 powder follows the Bragg diffraction of incident light on (111) stacked planes of the face-centered cubic colloidal crystals and the (111) crystal planes are randomly oriented. As a collective effect in the aggregation of micron-sized powders, the structural colors are angle-independent, and thus the 3DOM powders can be use as anti-reflective color coating material . In addition, because its diffraction can limit transmission and absorption of lights in some extent, so this 3DOM SiO 2 powder can be also used as protective coating material for reducing light radiations.
研究领域:
材料科学
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光学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2024
·
IF 13.3
Shiyong Wei,Aijia Cao,Siyuan Huang,Yao Shen,Ting Lei,Songmei Luo,Mingjun Cai,Wenjun Xiang,Anying Chen,Rui Wang
Although MIL-100(Fe) was regarded as an ideal material for the environmental remediation, it could not be applied in practical because of the potential eco-environmental risk and cost. In this work, a novelty strategy of liquidizing crystal MIL-100(Fe) was posted for the first time through inhibiting the crystallization process and forming physical MIL-100(Fe) gel. Due to this MIL-100(Fe) sol–gel, MIL-100(Fe) could easy cover on the surface of silica powder (SiO 2 ) through simple soaking operation. MIL-100(Fe) covering on SiO 2 (MIL-100(Fe)@SiO 2 ) could be quickly separated from wastewater spontaneously owing to the carrier of SiO 2 , even in a tank of 2.0 m, which made it possible for purifying wastewater in practical. MIL-100(Fe)@SiO 2 could remove phosphate with a removing ratio of closing 100 % at an initial concentration of 10 mg/L, while more than 95 % towards methyl orange (MO). The removing ratio of MO by MIL-100(Fe)@SiO 2 did not obviously decrease when the concentration of MO increased to 100 mg/L. And the adsorption performance of phosphate did not affect by pH among 3.0–9.0. The adsorption amount exceeded 50 % of maximum adsorption capacity for phosphate within 30 min, while 90 % for MO. Monodentate mononuclear coordination could explain the adsorption of phosphate by MIL-100(Fe)@SiO 2 . The N atom in MO might be acted as Lewis acid to coordinate with MIL-100(Fe)@SiO 2 . After adsorption, the P-saturated and MO-saturated MIL-100(Fe)@SiO 2 could be effectively regenerated by the dilute HCl and NaOH solution, respectively. The recovery ratio of adsorption capacity for phosphate and MO were up to 97.7 % and 71.6 %.
研究领域:
环境科学
·
材料科学
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产品关联
DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
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2021
·
IF 5.302
Hao Xiong,Anze Shui,Qingliang Shan,Shenghui Zeng,Xiuan Xi,Bin Du
Polishing porcelain stoneware tile residues (PPR) is used to prepare foamed ceramic to solve the problem of solid waste discharge in ceramic industry. In this study, C, Al and Si powder were added to the simulated PPR to control foaming, and the mechanism of silicon carbide foaming in the PPR was discussed in detail. After these powders were introduced into the simulated PPR, the phenomenon of alumina crystallization on the pore wall of the foamed ceramic and the diffusion of gas in the foamed ceramic were discovered to be exciting. The foaming mechanism of PPR is detailed as follows: the diffusion rate of oxygen in silicate liquid is faster than that of CO during sintering, so the CO generated by incomplete oxidation of silicon carbide in PPR accumulates in the liquid, which makes the volume of ceramics expand and causes foaming.
研究领域:
材料科学
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环境工程
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产品关联
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2021
·
IF 8.198
Yi Chen,Andac Armutlulu,Xia Jiang,Bo Lai,Wenju Jiang,Ruzhen Xie,John C. Crittenden
Mesoporous zeolite and hybrid zeolite are indispensable materials for the chemical industry; however, their fabrication always involved high production cost, long times, and adverse environmental impact. Here, we report a vacuum–ultraviolet (VUV)-initiated reactive oxygen species (ROS) route for the green and fast synthesis of mesoporous sodalite (SOD) zeolite and a hybrid SOD zeolite directly from lithium silica fume (LSF) waste without template. The fast synthesis is based on in situ generation of ROS (e.g., •OH, O2•–, and 1O2) in amorphous precursor using VUV irradiation, which significantly shortens the crystallization process to produce SOD with high crystallinity and abundant mesopores at low temperature. Further addition of graphene oxide (GO) during SOD preparation could not only inhibit the zeolite aggregation but also initiate electron transfer to further induce generation of superoxide ion radicals (O2•–), and yield a stable hybrid SOD zeolite with narrower band gap within 2 h. The physicochemical properties of the produced SOD and hybrid SOD were carefully studied, whereby electron paramagnetic resonance (EPR) was used to probe the existence of ROS which promote crystallization process. The metal ion adsorptive experiments revealed zeolites produced own superior ion-exchange capacity toward copper ion. This study opens up a new avenue to enable green and ultrafast synthesis of zeolites and hybrid zeolites with improved time efficiency.
研究领域:
材料科学
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环境科学
·
化学工程
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Jiewen Mo,Xiaoteng Chen,Jinxing Sun,Haowen Liang,Peng Zhou,Pavel Grinchuk,Jiaming Bai
Silicon carbide ceramics, featuring high-temperature resistance, are important in aerospace and renewable energy fields. With the increasing demand for complex ceramic structures, traditional manufacturing methods are becoming inadequate. Additive manufacturing technology based on vat photopolymerization holds great promise. However, during the additive manufacturing process of silicon carbide ceramics, issues such as light absorption and limited curing depth are faced. These problems impede the effective development of high-solid-loading silicon carbide ceramic slurries. This study systematically probes into the impacts of powder modification, dispersant concentration, and solid loading on the properties of silicon carbide ceramic slurries. Additionally, the oxidation degree of the powder was regulated. A slurry with a 50 vol.% solid loading suitable for vat photopolymerization has been developed, and complex silicon carbide structures have been fabricated. After sintering, the samples exhibit a flexural strength of 235.62 MPa and a density of 2.79 g/cm 3 , thus enhancing the potential for manufacturing complex ceramic components.
研究领域:
材料科学
·
增材制造
·
陶瓷工程
✓ 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）