CHINESE JOURNAL OF CHEMICAL ENGINEERING
·
2025
·
IF 3.7
Huagui Jin,Xuebin An,Shizhao Wang,Yunshan Wang,Gang Yang,Yong Sun
s This study investigates the removal of fluorine (F) impurities from phosphogypsum (PG) using steam as the reaction medium. The effects of the reaction atmosphere, temperature, time, and steam velocity on F impurities removal were systematically examined. The results showed that with a steam velocity of 0.0184 m·s −1 , a reaction temperature of 700 °C, and a reaction time of 60 min, the F removal rate reached 95.87%. Further investigations into the defluorination mechanism revealed that steam and SiO 2 synergistically enhance fluoride removal, playing a crucial role in improving the defluorination efficiency. Kinetic analysis of the defluorination process, based on the shrinking core model (SCM), indicated that internal diffusion is the rate-controlling step, with the activation energy of 30.12 kJ·mol −1 . This study identifies optimal conditions for PG defluorination and proposes a defluorination mechanism, contributing to the theoretical understanding of impurity removal through the thermal treatment of PG.
研究领域:
化学工程
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
POLYMER
·
2025
·
IF 4.5
Xiansheng Tan,Wenting Deng,Shuhuan Feng,Tengfei Xu,Yuxin Wang,Jianhao Zhao,Jianhua Rong
For hydrogel applied in joint cartilage replacement, achieving both high toughness and low friction performance is a significant challenge. This study modifies polyvinyl alcohol hydrogel by using wet annealing and immersion methods. Wet annealing allows conformational rearrangement to improve crystallinity while maintaining the overall structure of the hydrogel. The immersion method induces the formation of tiny silica dioxide particles within the hydrogel. The mechanical properties of the hydrogel are greatly enhanced through the synergistic effect of these two mechanisms. Additionally, the introduction of mucin into the hydrogel achieves ultra-low lubrication performance through the brush-like oligosaccharide side chains and the negative charge saliva residues of mucin. The prepared hydrogel material not only exhibits excellent mechanical properties (tensile strength 5.11 MPa, tensile modulus 4.56 MPa, compressive strength 27.56 MPa, compressive modulus 2.04 MPa), but also maintains continuous lubrication and a low friction coefficient (0.037) under high loads (5 N) and high speeds (20 mm/s). The hydrogel maintains volume stability in a simulated body fluid environment for an extended period after swelling equilibrium. This method for preparing ultra-tough and lubricating hydrogels can offer valuable insights for researchers in the field.
研究领域:
生物材料学
·
组织工程学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED OPTICS
·
2017
·Vol. 56
·期 17
·4905-4910
·
IF 1.65
Yuan Cheng,Kangning Sun
Core-shell structured SiO2@YVO4:Yb3+, Er3+, Eu3+ nanospheres were prepared by a simple solgel method followed by a subsequent heat treatment. The as-prepared composites were characterized by a scanning electron microscope, high-resolution transmission electron microscope, x-ray diffraction, and photoluminescence spectra. The influences of different coating numbers were also studied. To sum up, the composites are spherical shaped with an average diameter of 200 nm, and the YVO4:Yb3+, Er3+, Eu3+ luminescent particles are successfully coated on the surface of SiO2 nanospheres. Under the near-infrared irradiation at 980 nm, the composites can emit strong green lights (at 525 nm, 550 nm) attributed to the H11/22→I15/24, S3/24→I15/24 transitions of Er3+ ions, and slight red lights (at 590 nm, 620 nm) attributed to the D05→F17, D05→F27 transitions of Eu3+ ions. Given the above, due to the regular core-shell structure, the uniform distribution of nanoparticles, and the colorful emissions, the SiO2@YVO4:Yb3+, Er3+, Eu3+ nanospheres may have great potential for some biological applications, such as biological tracers, bio-labeling, and so on.
研究领域:
材料科学
·
生物医学工程
✓ 已验证
DOI
高影响因子
EUROPEAN POLYMER JOURNAL
·
2021
·
IF 4.598
Bo Wu,Yi Xu,Nan Wu,Xianzhong Tang
Dielectric materials play a crucial role in 5G communication technological applications such as printed circuit board (PCB) high-frequency substrate materials. Unfortunately, the fabrication of desirable dielectric performance in organic–inorganic composites is a great challenge because of lack of good interfacial compatibility and uniform dispersion between fillers and polymer. In this work, silicon dioxide (SiO 2 ) was synchronously functionalized by γ-methacryloxypropyltrimethoxysilane (MPS, s-SiO 2 ) and 1,2-polybutadiene (PB, v-SiO 2 ), which were then used as fillers to fabricate the s-SiO 2 /polyolefin or v-SiO 2 /polyolefin laminates. All the v-SiO 2 /polyolefin laminates exhibited better dielectric, thermal and mechanical properties than those of s-SiO 2 /polyolefin laminates under the same filler content. Specially, the 50 wt% v-SiO 2 /polyolefin laminate displays a low dielectric constant (3.42) and loss (3.55 × 10 -3 ) at 10 GHz. Meanwhile, it also shows good stability of dielectric properties in a wide range of high-frequency. This work is conducive to develop laminates with superior dielectric properties and apply to PCB high-frequency substrate field.
研究领域:
材料科学
·
电子工程
✓ 已验证
DOI
高影响因子
JOURNAL OF ENVIRONMENTAL MANAGEMENT
·
2024
·
IF 8
Meichen Liu,Meichen Gao,Xu Shi,Yilin Yin,Huanyi Liu,Ruirui Xie,Chenxi Huang,Wenwen Zhang,Shiwen Xu
With the increasing development of the society, silicon dioxide (SiO 2 ) has been used in various fields, such as agriculture, food industry, etc., and its residues can pose a potential health threat to organisms. Quercetin (Que) is a potent free radical scavenger commonly found in plants. C57BL/6 mice were chosen to established a mouse model of SiO 2 exposure and Que antagonism to investigate the mechanism of action of Que in rescuing the toxic damage of SiO 2 on mouse cerebellum tissue. The results showed that cytoplasmic vacuolization, and inflammatory cell infiltration caused by SiO 2 were alleviated by the addition of Que, and reduced oxidative stress in mouse cerebellum, alleviated the activation of TLR4 pathway induced by SiO 2 , and substantially reduced the occurrence of ZBP-1-mediated PANoptosis induced by SiO 2 exposure in mouse cerebellum. In NS20Y cells, the oxidative stress activator (Elesclomol) and inhibitor N-acetyl cysteine (NAC), and the NF-κB activator 2 (NA2) were added. Elesclomol and NAC confirm the involvement of ROS in regulating the TLR4/NF-κB pathway, the TLR4/NF-κB pathway regulated ZBP-1-mediated PANoptosis in cerebellum and NS20Y cells induced by SiO 2 exposure. In conclusion, the present experimental data suggest that Que mitigates the onset of ZBP-1-mediated PANoptosis in neuronal cells induced by SiO 2 through the ROS/TLR4/NF-κB pathway. The present experimental findings help to understand the detoxification effect of Que in more tissues and provide an important reference for the rescue of organisms in long-term SiO 2 environment.
研究领域:
神经生物学
·
毒理学
·
细胞信号传导
✓ 已验证
DOI
高影响因子
ANALYTICAL AND BIOANALYTICAL CHEMISTRY
·
2021
·Vol. 413
·期 19
·4751-4761
·
IF 4.157
Cai Rongyuan,Lu Dechan,She Qiutian,You Ruiyun,Feng Shangyuan,Lin Xueliang,Lu Yudong
When nitrite is ingested and absorbed by the body, it can be converted into highly toxic nitrosamines (carcinogens, teratogens, and mutagens), posing health risks to the general population. Therefore, it calls for establishing a method for determination of nitrite. In this paper, the glass-SiO 2 -Ag surface-enhanced Raman scattering (SERS) substrate with a large number of “hot spots” were prepared by two kinds of silane coupling agents. The SERS substrate had high sensitivity and repeatability. Silicon dioxide supported the silver nanoparticles (Ag NPs), which increased surface roughness of the substrate, generated a great quantity of hot spots and enhanced the SERS signal. In the SERS spectrum, the intensity ratio of the two characteristic peaks (1287 cm −1 and 1076 cm −1 ) had a good linear correlation with the logarithm of the concentration of nitrite, R 2 = 0.9652. The recoveries of 50 μM and 100 μM nitrite in three kinds of foods, three kinds of cosmetics and tap water were 90.9–105.3%. Graphical abstract
研究领域:
分析化学
·
环境科学
·
食品安全
✓ 已验证
DOI
高影响因子
IEEE TRANSACTIONS ON DIELECTRICS AND ELECTRICAL INSULATION
·
2018
·Vol. 25
·期 3
·1003-1013
·
IF 1.774
Youyuan Wang,Can Wang,Zhanxi Zhang,Kun Xiao
This paper reports on the anti-thermal aging ability enhanced by nanoparticles for polyethylene based nanocomposites. Nanocomposites with concentration of 1 wt% were prepared by using silicon dioxide (SiO
2
), zinc oxide (ZnO) and magnesium oxide (MgO) nanoparticles. Fourier-transform infrared spectra showed that the low-density polyethylene (LDPE)/MgO nanocomposites had the best anti-thermal aging ability in comparison with the LDPE/SiO
2
nanocomposites, which had the worst anti-thermal aging ability. Subsequently the ability of nanocomposites to ensure the electrical properties was examined by dielectric properties and space charge distribution. The results show that LDPE/MgO and LDPE/ZnO nanocomposites retained the value and the relaxation peaks of permittivity to a certain extent after thermal aging. All of the nanocomposites presented the ability for suppression of space charge accumulation after thermal aging compared with neat LDPE with the observation of obvious homocharges accumulated near electrodes. We find that the interface between nanoparticles and matrix may be the reason for the anti-thermal aging ability exhibited by the nanocomposites.
研究领域:
材料科学
·
电气工程
✓ 已验证
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2018
·
IF 3.141
Da Wang,Zhong Wang,Guangci Li,Xuebing Li,Bo Hou
SiO2-modified high thermal conductivity Al2O3@Al composites were synthesized and supported cobalt for Fischer–Tropsch synthesis to improve the catalytic performance and intensify the heat transfer within a fixed-bed reactor. FTS results showed that the CO conversion and C5+ selectivity increased whereas CH4 selectivity decreased, which could be attributed to the reduced metal–support interaction via modification of SiO2 on the surface of Al2O3@Al. The heat transfer coefficients of the Co/SAl2O3@Al–x were more than 30 times those of conventional Co/Al2O3 according to the laser flash measurement. The thermal conductive study showed that a homogeneous radial temperature gradient was maintained within the catalyst bed for Co/SAl2O3@Al-x even without using a heat diluter, indicating good thermal conductivity within the reactor. In addition, the temperature of the catalyst bed for Co/SAl2O3@Al-x was easier to reach a “steady state” compared to the reactor packed with traditional low thermal conductive Co/Al2O3, which could improve the operating flexibility of FTS.
研究领域:
化学工程
·
材料科学
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
·
2021
·Vol. 45
·期 11
·16551-16564
·
IF 5.164
Jiuqing Liu,Meng Liu,Cheng Wang,Qihou Li,Jie Li,Ya Chen,Zikun Hong,Feifei Song,Lishun Bai,Fanli Zeng
Summary The dissolution and diffusion of intermediate product polysulfide in lithium-sulfur battery (Li-S) between electrodes pose great challenge for the further application of Li-S batteries. Herein, we first prepared nano SiO 2 blending polyetherimide (PEI) separator modified with acetylene black/polyvinylpyrrolidone (PVP) coating layer. Joint effect of acetylene black and PVP on polysulfide contribute to outstanding cycle performance. The Li-S cell with CP55 separator presents superior cycle performance (650 mAh g −1 ) than the Li-S cells with the Celgard 2320 and PEI-4 separator after 200 cycles. In addition, the SiO 2 blending PEI separator modified with acetylene black/PVP coating layer for Li-S cells shows higher ionic conductivity (2.02 mS cm −1 ), excellent compatibility with lithium and better thermal stability. This work presents a convenient and economical strategy to alleviate polysulfide dissolution and the CP55 separator is a promising candidate for the further application of Li-S batteries.
研究领域:
材料科学
·
电化学
·
能源存储
✓ 已验证
DOI
高影响因子
JOURNAL OF NON-CRYSTALLINE SOLIDS
·
2025
·
IF 3.5
Tianfeng Yang,Dongxue Ren,Xiaping Zhu,Qing Li,Haiyan Li,Jia Chen,Hongyi Sun,Yonghua Sun
This study presents a method for the production of SiO 2 wires in a system composed of isopropanol, polyvinylpyrrolidone, ammonia and sodium citrate. The typical wires were mildly curved with an average diameter of 500 nm and an aspect ratio up to 60 or more. A 50-fold expansion of this process still gave stable wires with a yield of about 86 %. Monitoring the sodium levels along the SiO 2 wires revealed that sodium was present in different parts of the wires. Based on this phenomenon, we propose a growth mechanism for SiO 2 wires. The present system produces SiO 2 wires more stably and efficiently than the previously reported n-pentanol-PVP-ammonia-sodium citrate method, while significantly reducing both the amount of PVP and the preparation time.
研究领域:
材料科学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2019
·Vol. 43
·期 9
·3829-3834
·
IF 3.069
Yan Zhou,Xincai Liu,Xiaoteng Jia,Danming Chao
Substantial progress has been made in high-performance electrochromic devices. However, there are limited reports on the enhancement of electrochromic stability, which is an important parameter for practical applications. Herein, we report the design and synthesis of two hydrolysable siloxane precursors bearing oligoaniline and graphene oxides, followed by a crosslinking reaction during cyclic voltammetry, yielding an interpenetrating network composite film. Benefiting from the porous structure, the resulting network composite film exhibits good electrochromic performance with good stability. The combination of such good electrochemical activity and interpenetrating network architecture makes this a promising material for high-performance electrochromic devices.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
GREEN CHEMISTRY
·
2025
·
IF 9.2
Qian Jiang,Shuguang Xu,Zuzhi Li,Xingjie Guo,Rui Zhang,Zhicheng Jiang,Bi Shi
The design of heterogeneous catalysts to enhance substrate adsorption and hydrogen spillover plays a key role in the hydrogenation of biomass-derived chemicals. Herein, a composite catalyst support featuring a nano-SiO2 core and a nitrogen-doped carbon shell was developed for Pd loading (Pd/SiO2@NC). Following NC coating, the pyridine-N and pyrrole-N in the porous NC shell interacted with Pd through their lone pair electrons, enabling the anchoring and dispersion of Pd nanoparticles. The incorporation of SiO2 with NC notably increased the electronegativity at the interface, improving the vanillin (VAN) adsorption through both VAN-Pd and VAN-SiO2@NC interactions. Moreover, electron transfer between SiO2 and NC promoted hydrogen spillover, effectively lowering the energy barrier for the hydrogenation process. Consequently, >99% of VAN was completely hydrogenated to vanillyl alcohol over Pd/SiO2@NC under mild conditions (0.5 MPa H2, 20 °C, 60 min). The catalyst exhibited widespread activity for various lignin-derived aromatic aldehydes, indicating considerable potential for industrial applications. This study constructed the active catalyst surface that successfully synthesized aromatic alcohols from renewable lignin-derived compounds, effectively replacing traditional synthesis process.
研究领域:
催化化学
·
材料科学
·
可再生能源
✓ 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）