JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
·
2012
·Vol. 64
·期 2
·347-357
·
IF 1.632
Zhang Jian-Ming,Zhai Shang-Ru,Zhai Bin,An Qing-Da,Tian Ge
Multifunctional nanomaterials with task-specific physicochemical properties, especially core–shell nanostructures with Fe 3 O 4 core and NH 2 -functional shells (Fe 3 O 4 @SiO 2 –NH 2 ), have been extensively investigated as high-performance adsorbents, catalysts and catalyst supports; and in most cases the controllable sol–gel technique is the choice for fabrication of this kind of widely applied materials. Herein, we demonstrated that mono-dispersed and spherical Fe 3 O 4 @SiO 2 –NH 2 nanomaterials with magnetic response core, NH 2 -functional shell structure can be facilely prepared by co-condensation of TEOS with APTMS using a versatile sol–gel process. It was shown that the proper usage of APTMS and appropriate pre-hydrolysis time of TEOS were crucial and key steps for formation of highly uniform and desirable amino loading Fe 3 O 4 @SiO 2 –NH 2 materials. The TEOS pre-hydrolysis and the critical time (around 90 min) before the addition of APTMS prove to be vital for uniform structure evolution, while the appropriate concentration of APTMS (~2.28 mmol L −1 in our system) leads to well-dispersed materials with relatively high loading of amino functionality. The as-prepared Fe 3 O 4 @SiO 2 –NH 2 magnetic nanoparticles prepared under optimum conditions possessing superparamagnetic behavior, uniform core–shell structure (~200 nm in diameter), relatively large BET surface area (~138 m 2 /g) and high incorporation of amino-functionality (~2.90 wt %).
研究领域:
材料科学
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化学工程
·
纳米技术
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产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2017
·Vol. 41
·期 13
·5688-5695
·
IF 3.269
Xiaoming Xie,Jie Chen,Ye Sheng,Yanhua Song,Xiuqing Zhou,Xiangting Zhang,Zhan Shi,Haifeng Zou,Keyan Zheng
A series of novel color tunable dandelion-like SiO2:Ln3+ (Ln = Eu, Tb) nanophosphors of approximately 70 nm diameter were prepared using a simple hydrothermal route. The phase, time-dependent shape evolution, morphology, sizes, and luminescence properties of the as-prepared products were well characterized by means of X-ray diffraction, scanning electron microscopy, energy-dispersive X-ray spectrometry, and photoluminescence spectra as well as kinetic decay curves. Under ultraviolet excitation, the Eu3+ and Tb3+ singly doped SiO2 samples showed strong red and green emission, respectively. Furthermore, the luminescence colors of the as-prepared Tb3+, Eu3+ co-doped dandelion-like SiO2 nanophosphors could be altered from green to red, including green-yellow, yellow, orange yellow and reddish orange, by simply adjusting the doping concentrations of Eu3+.
研究领域:
材料科学
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纳米技术
·
光学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL PHYSICS LETTERS
·
2018
·
IF 1.686
Qingqian Fan,Yueping Guan,Zhi Zhang,Guoli Xu,Yu Yang,Chen Guo
A new method was developed for preparing monodisperse Fe 3 O 4 @SiO 2 magnetic core-shell nanoparticles via three steps. The obtained nanoparticles exhibit high saturation magnetization, good surface topography and dispersion as characterized by FTIR, SEM and VSM. The experimental results of hydrochloric acid treatment show that the obtained nanoparticles have excellent acid resistance and stable and compact silicon coating. The magnetic core-shell nanoparticles were further tested for purification of plasmid DNA from E. coli DH5a cells. The result of purification leaded to better adsorption, elution and purity results in comparison with isolated commercial extraction kit.
研究领域:
生物技术
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材料科学
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分子生物学
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DOI
高影响因子
POLYMER COMPOSITES
·
2023
·Vol. 44
·期 4
·2500-2511
·
IF 5.2
Ning Guo,Zifan Tang,Jiaming Sun,Yulong Wang,Lili Li,Junguo Gao
In this paper, SiO 2 particles with three particle sizes of 60 nm, 2 μm, and 25 μm were added as fillers into the composites prepared by epoxy resin and micron silicon carbide to investigate the mechanism of SiO 2 particle size on the nonlinear electrical conductivity and breakdown characteristics of the composites. Compared with SiC/EP composites, the smaller the added SiO 2 particle size, the lower the current density at high fields and the higher the breakdown field strength of SiO 2 /SiC/EP composites. The nonlinear coefficients of SiO 2 /SiC/EP composites increased slightly with the addition of 1phr 25 μm SiO 2 and 4phr 2 μm SiO 2 , and the breakdown field strengths were increased by 55.36% and 66.77%, respectively. The SiO 2 /SiC/EP composites with the addition of 4phr 60 nm SiO 2 particles showed the most significant attenuation of the conductivity current and the most prominent enhancement of the breakdown field strength, but the nonlinear coefficient was reduced by 24.6%. With the increase of SiO 2 doping amount, compared with the composites with the same particle size and low doping amount, the larger the SiO 2 particle size, the decrease of the current density of the composites under high field intensity is more obvious, and the dielectric constant drops even more.
研究领域:
材料科学
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电气工程
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2020
·
IF 10.652
Jiage Yu,Kun Wang,Wenlong Song,Hui Huang,Chu Liang,Yang Xia,Jun Zhang,Yongping Gan,Feng Wang,Wenkui Zhang
Nano-silicon is a star anode material for the next generation Li-ion batteries with the merits of high theoretical capacity and low voltage plateau. To date, it remains a great challenge to efficiently convert low-cost silica (SiO 2 ) into nano-Si at a low temperature due to the solid Si-O band (the bond energy is 460 kJ mol −1 ). Herein, a low temperature MgH 2 -AlCl 3 -SiO 2 melt system is developed to synthesize nano-Si through the reduction of SiO 2 by MgH 2 in the molten AlCl 3 . It is confirmed to be a controllable liquid-solid process with no side reactions and high Si yield of 97.6%. The battery grade nano-Si product can be obtained by suitable post-treatment without undesirable HF etching. This reaction can be initiated at as low as 150 °C, which is much lower than mostly reported synthesis routes of nano-Si. The nano-Si product with an average particle size of 22.4 nm exhibits superior electrochemical storage capacity of 1185 mA h g −1 over 300 cycles at 0.2 A g −1 and a low increased thickness of 14.5% at 2 A g −1 over 500 cycles. We believe that this low temperature melt system not only paves the new path of synthesizing nano-Si, but also gives a new insight into the effects of nanoscale particle size on the electrochemical performance of Si anode.
研究领域:
材料科学
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能源存储
✓ 已验证
DOI
高影响因子
International Journal of Applied Ceramic Technology
·
2025
·
IF 2.3
Jiexin Jiao,Guoqing Xiao,Donghai Ding,Shaonan Liu,Li Zhang
In order to improve the mechanical properties of the SiO 2f /SiO 2 composites, the uniform and complete Al 2 O 3 coatings were prepared on the quartz fibers via sol–gel method with aluminum isopropoxide as the precursor. The thickness of Al 2 O 3 coatings increases with concentration of aluminum isopropoxide precursor solution. The Al 2 O 3 coatings fabricated with 10 wt.% precursor solution were uniform and complete, and its thickness was approximately 430 nm. The SiO 2f /SiO 2 composites with Al 2 O 3 coatings achieve higher mechanical strength compared with the SiO 2f /SiO 2 composites without Al 2 O 3 coatings. The flexural strength of SiO 2f /SiO 2 composites increases with concentration of aluminum isopropoxide precursor solution. And the compressive strength shows a slightly decreasing trend with concentration of aluminum isopropoxide precursor solution. The mechanical performance of the SiO 2f /SiO 2 composites fabricated from fibers coated with 10 wt.% aluminum isopropoxide precursor solution was excellent, and its compressive strength was 57.1 MPa, flexural strength was 28.6 MPa. And the reason was that the Al 2 O 3 coatings effectively enhanced the interface isolation between the fiber and the matrix, optimizes the deflection path of the crack and increased the strength of the SiO 2f /SiO 2 composites. The mechanical strength of SiO 2f /SiO 2 composites with Al 2 O 3 coatings was increased after not only short-term but also long-term heat treatment.
研究领域:
材料科学
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工程学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Xiaoyan Chen,Jiangdong Cui,Xinyu Yang,Taoyue Yuan,Jiacheng Ge,Mengtao Ma,Shunke Ding,Wenhai Chu
The core bottleneck in water decontamination lies in trigging the selective removal of trace contaminants in the presence of complex water matrices, overcoming the inevitable consumption of oxidants and energy input by the water matrix. Here, the selective removal of phenolic contaminants with permanganate (PM) oxidation mediated by 2,2,6,6-tetramethylpiperidinooxy (TEMPO)-functionalized silica (SiO 2 @TEMPO) was firstly reported. SiO 2 @TEMPO was synthesized by covalently bonding 4-oxo-2,2,6,6-tetramethylpiperidinooxy onto SiO 2 through a 3-aminopropyltriethoxysilane bridge. The loading capacity of Wt% for nitrogen element in SiO 2 @TEMPO are 1.01–1.27 %. The degradation rate of tetracycline (around 1.50 min −1 ) with SiO 2 @TEMPO/PM are around 15 folds higher than that with PM, attributed to the formation of the reactive N-oxoammonium cation via single-electron transfer during PM oxidation. SiO 2 @TEMPO exhibited excellent stability and recyclability after five consecutive cycles of tetracycline degradation. Three transformation pathways (hydroxylation, demethylation, and dehydration) for tetracycline degradation by SiO 2 @TEMPO/PM were proposed based on the identification of 36 transformation products using HPLC/Q-Orbitrap HRMS. Thereinto, the attack of the N-oxoammonium cation in SiO 2 @TEMPO on the phenolic hydroxyl group to form corresponding hydroxylation and quinylation products accounted for the dominant degradation pathway. SiO 2 @TEMPO/PM also demonstrated remarkable adaptability across a wide pH range of 5.0–9.0, indicating its potential for practical applications. The significant resistance to the inhibitory effects of co-existing water matrix components (humic acid, cations and anions), along with the marked differences in degradation efficiency between phenolic and non-phenolic contaminants, demonstrate the selectivity of SiO 2 @TEMPO/PM towards phenolic contaminants. These results offer new insights into the selective removal of phenolic contaminants and pave the way for the development of efficient and sustainable strategies for water remediation.
研究领域:
环境科学
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化学
✓ 已验证
产品关联
DOI
高影响因子
Russian Journal of Physical Chemistry A
·
2024
·Vol. 98
·期 9
·2135-2145
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IF 0.7
Wenjie Liu,Ding Xiang,Liu Jingwei,Meng Jie,Li Xiazhang,Gao Bingying,Zuo ShiXiang,Yao Chao,Xue Bing
Abstract The composites (SiO 2 /HATP) were prepared by condensation reflux and high-temperature calcination using natural attapulgite and silica particles, and it was utilized for the adsorption of toluene. The physicochemical properties of the composite adsorbents were characterized using XRD, FT-IR, SEM, and BET techniques. The SiO 2 /HATP composite material was successfully prepared, with silica particles uniformly loaded onto the surface of ATP. The adsorption performance of the composite materials for toluene was investigated using different feed ratios. The results showed that the composite materials with the mass ratio SiO 2 /ATP equal to 4 exhibited the highest static adsorption capacity for toluene, reaching 236 mg/g. Additionally, dynamic adsorption performance of toluene was evaluated under conditions of 0 and 80% relative humidity, with corresponding breakthrough times of 90 and 36 min, respectively. The adsorption capacity of the composite materials for toluene was 6–8 times higher than that of pure attapulgite clay. Furthermore, the adsorption mechanisms of the composite materials were investigated through adsorption kinetics, adsorption isotherms, and adsorption thermodynamics. The results indicated that the adsorption of toluene by the composite materials followed a pseudo-first-order kinetic model and Langmuir adsorption isotherm, suggesting a spontaneous exothermic physical adsorption process at a monolayer level. Moreover, regeneration experiments were conducted, and after 5 cycles of adsorption-desorption tests, the composite materials maintained a penetration time of 85 and 30 min for toluene under conditions of 0 and 80% relative humidity, respectively, demonstrating good recyclability.
研究领域:
材料科学
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环境科学
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产品关联
DOI
高影响因子
INDUSTRIAL CROPS AND PRODUCTS
·
2024
·
IF 5.6
Yinjie Ma,Ping Wang,Qingmiao Wang,Fengmei Ding
Aqueous emulsion polymerization prepared a nano-SiO 2 polyacrylate fluorine-free anti-fouling finishing agent in this study. The finishing agent was prepared by copolymerizing nano-SiO 2 modified by KH-570 silane coupling agent with 3-[Tris(trimethylsilyloxy)silyl]propyl methacrylate (M3T) and stearyl methacrylate (SMA). The polymer emulsion has a uniform particle size distribution and can meet the use temperature below 160 °C. It also has good stability under solid acid/alkali conditions. The prepared anti-fouling finishing agent was applied to the cotton fabric by a two-dip and two-roll finishing process, and a polymer film containing nanoparticles can form on the surface of the cotton fiber. The experimental results showed that the finished cotton fabric’s apparent roughness increases, making it superhydrophobic. The water contact angle of the finished cotton fabric is 159 °, and it is still not lower than 150 ° after 10 washing cycles and 50 abrasion cycles. At the same time, it also has an excellent water-repellent function, and the spray test score reaches 100 (iSO-5). In addition, the coffee grounds sprinkled on the surface of the finished cotton fabric can roll off with the droplets, showing its self-cleaning ability. Most importantly, it has a specific anti-vegetable oil function because common vegetable oil can stay on its surface for 5 min without thoroughly wetting. It is worth noting that the preparation process is economical, environmentally friendly, and fluorine-free.
研究领域:
材料科学
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纺织工程
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Nano Materials
·
2024
·
IF 5.3
Kai Zhao,Zhen Bao,Qi Liu
CsPbX3 (X = Cl, Br, and I) perovskite nanocrystals (PNCs) have been recognized as potential optoelectronic materials due to their excellent optical characteristics. However, their poor stability limits their further practical application, and research on their stability improvement mainly concentrated on green-emitted CsPbBr3 PNCs. Herein, high-stable red, green, and blue three-primary color CsPbX3-nanocrystal/SiO2 (PNC/SiO2) luminescent composites have been synthesized by a simple high-temperature melt-crystallization method, which did not use any solvent or ligand. The sintering conditions for PNC/SiO2 composites were optimized according to the X-ray diffraction and photoluminescence (PL) spectra, which ensured the composite structures and achieved higher PL quantum yield. The optimized red, green, and blue composites can remain at 99%, 90%, and 82% PL intensity after 15 heating loops, performing good thermal stability. To check the application potential, the optimized composites were fabricated as red, green, and blue light-emitting diodes (LEDs), showing high color purity to consist of a wide color gamut. The red, green, and blue LEDs remained at 83%, 82%, and 96% emission intensity and kept their color coordinates after a long working duration, showing excellent stability. The excellent stability and relatively higher color purity of the PNC/SiO2 composites indicate their great potential for commercial background display applications.
研究领域:
材料科学
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光学工程
·
显示技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2019
·Vol. 136
·期 45
·48204
·
IF 2.188
Hao Sun,Yijun Liu,Dan Li,Bing Liu,Jie Yao
Thin film composite (TFC) membrane can get rid of small molecular contaminants and salts with a very high efficiency, thus exhibiting promising potential for addressing the emerging problem of a clean water shortage. In this work, a new type of TFC membrane was prepared by interfacial polymerization of two monomers (MPD and TMC) on surface of SiO 2 /polyvinylidene fluoride (PVDF) substrate. The maximum flux of 3.16 L m −2 h −1 Bar −1 was achieved for the optimized hydrophobic SiO 2 nanoparticles well dispersed in PVDF substrate, which is 2.6 times higher than that of 1.21 L m −2 h −1 Bar −1 for the commercial cellulose triacetate reverse osmosis membrane. The improved performance of TFC membrane could be attributed to the higher compaction resistance of SiO 2 /PVDF substrate. Further analysis revealed that PVDF crystal phase inversion induced by superhydrophobic SiO 2 nanoparticles obviously enhanced the intramolecular and intermolecular hydrogen bonds between PVDF polymer molecules. Additionally, the narrower finger-like pore size and thicker pore wall of SiO 2 /PVDF substrate also played significant roles in enhancing the compaction resistance of PVDF membrane. This work also provides a proof-of-concept demonstration of high permeability substrates for effective flux enhancement of TFC membranes. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019 , 136 , 48204.
研究领域:
材料科学
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环境工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2022
·Vol. 140
·期 3
·e53341
·
IF 3.057
Zhehong Lu,Yubing Hu,Tengyue Zhang,Hao Li,Haoran Bai,Guangpu Zhang,Fan Guo,Wei Jiang
The anti-migration ethylene propylene diene terpolymer (EPDM) inhibitor coating was prepared by using EPDM as a composite matrix and silicon-functionalized graphene oxide (GO-SiO 2 ) as modifiers to prevent the migration of energetic plasticizers in propellants. The anti-migration performance at different temperatures was analyzed by investigating the diffusion of dioctyl sebacate (DOS) using thermal analysis and immersion tests. After adding 1.0 wt% GO-SiO 2 , the overall performance of the inhibitor coating was the best, and the concentration of DOS that migrated into the inhibitor coating at 30°C was reduced from 45.1% to 38.8% (13.9% decrease). The results confirmed that the introduction of GO-SiO 2 prevented the migration of dioctyl sebacate to the EPDM inhibitor coating. The scanning electron microscopy results showed that GO-SiO 2 was well-dispersed in the inhibitor coating, and the tensile strength increased from 1.80 to 2.11 MPa. Migration kinetics analysis showed that the anti-migration performance was closely related to the crosslink density.
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
危险品化学品经营许可证（带存储）