JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2018
·Vol. 30
·期 1
·69-78
·
IF 2.324
Li Jian,Yang Shengliang,Zhou Hongming,Wang Lihua,Yang Zhaohui,Meng Pengyu,Hu Leshan,Hu Rong
SiO 2 /C composites using polyvinyl chloride (PVC) as carbon sources are prepared successfully via a facile and low-cost approach. In this paper, the effect of four coating ratios on the SiO 2 /C materials is investigated. When tested as an anode material for lithium-ion batteries, the samples possessing a high carbon content display a better electrochemical stability. The high-content PVC pyrolytic carbon can provide a malleable and high electrical conductivity carbon layer for SiO 2 , which has more defects and benefits the diffusion of Li ions between the electrolyte and SiO 2 /C. However, considering the low capacity of the PVC pyrolytic carbon, a carbon content of 25% was chosen as the best coating ratio. This SiO 2 /C electrode shows a reversible capacity of 695 mAh g −1 at a current density of 100 mA g −1 after 200 cycles, with a capacity retention of 86.4% after the first cycle. The electrode also displays a discharge capacity of 535 mAh g −1 at a current density of 1 A g −1 . Taking into consideration the facileness and the low cost of the synthetic method, this SiO 2 /C composite anode material may have a great prospect of industrialization.
研究领域:
材料科学
·
能源存储
✓ 已验证
DOI
高影响因子
JOURNAL OF POLYMER ENGINEERING
·
2023
·
IF 2
Guanglong Li,Shenwei Shi,Lexing Zhang,Ting Li,Yang Wang,Weifu Dong
Polyurethane (PU) blended with nano-bactericidal agents was one of the most ways to obtain PU with antimicrobial properties. However, the bactericidal agent nanoparticles cannot effectively enrich the PU surface to reduce their antimicrobial properties. In this study, nano-silica particles with a large number of polar quaternary ammonium salt ( N , N -dimethyl-3-aminopropyl-12-alkyl-ammonium bromide trimethylsilyl, denoted as QAC) can easily enrich the PU surface to endow PU with excellent antibacterial properties after they were blended with PU film. The QAC on the surface of silica with different diameters (denoted as SiO 2 -Q- X ) can endow silica with antimicrobial properties and improve the repulsion between silica and PU to enhance the enrichment on PU surface of silica. A series of SiO 2 -Q- X /PU blend films were prepared and applied to inhibit the growth of the bacterial colony. The SiO 2 -Q- X /PU films can inhibit the growth of Gram-negative Escherichia coli and Gram-positive Staphylococcus epidermidis . The SiO 2 -Q- X with more polar QAC was easily enriched on the surface of PU and had a better bactericidal effect than those of SiO 2 -Q- X with a minor polar QAC. Moreover, the aging of the SiO 2 -Q- X /PU films did not affect their antibacterial effect.
研究领域:
材料科学
·
微生物学
✓ 已验证
DOI
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2025
·Vol. 108
·期 12
·e70185
·
IF 3.8
Luyang Zhang,Lin Chen,Jiankun Wang,Bingyan Wu,Jing Feng
Directional optimization of properties is of significant interest for various protective coatings materials. This study investigates the effects of SiO 2 doping on AlTaO 4 ceramics as environmental barrier coatings (EBCs), and the changes in crystal structure and comprehensive properties are thoroughly investigated. The x mol% SiO 2 –AlTaO 4 (SATO, x = 0, 3, 6, 9, 12, 15) ceramics are fabricated via a solid-state sintering process, and their structures, as well as thermo-mechanical properties, are systematically analyzed. The results reveal that SiO 2 doping introduces point defects and lattice distortions, which significantly reduce the thermal conductivity by 44% at 900°C, and effectively suppresses the increase in thermal conductivity at elevated temperatures. Furthermore, the fracture toughness is improved from 3.01 to 3.38 MPa·m 1/2 , demonstrating superior mechanical properties compared with other EBC materials. The thermal expansion coefficients (TECs) are reduced to 5.71 × 10 −6 K −1 at 1200°C, which match with those of SiC ceramic matrix composites (TECs = 5.50 × 10 −6 K −1 ). These findings highlight that SATO ceramics are promising candidates as EBC materials, and SiO 2 doping can further advance its high-temperature applications.
研究领域:
材料科学
·
陶瓷
·
热障涂层
·
高温材料
·
材料力学性能
✓ 已验证
产品关联
DOI
高影响因子
Journal of Macromolecular Science Part A-Pure and Applied Chemistry
·
2024
·
IF 2.1
Yuan Ma,Lujie Wang,Haowen Wu,Qian Zhao,Jiying Men
Firstly, the SiO2 microspheres were prepared by Stӧber method, and then modified by 3-Aminopropyltrimethoxysilane (KH-540) to introduce –NH2 onto the microspheres. Then, SiO2-NH2 microspheres were mixed into polysulfone casting solution, and SiO2-NH2/PSF composite membrane was prepared by the phase conversion method. On this basis, the functional adsorbent SiO2-NH2/PSF-g-PMAA was prepared by grafting polymerization of methacrylic acid (MAA) as a functional monomer using –NH2/S2O82− surface initiation system. The samples were characterized by Fourier infrared spectroscopy (FT-IR), scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), the Brunauer–Emmett–Teller (BET) and weighing method. The adsorption properties of amlodipine (ADP) by functional adsorbents were investigated, and the adsorption mechanism was further studied. The results show that the adsorption reaches equilibrium at 180 min, and the adsorption kinetics can be well fitted by the pseudo-second-order model. The adsorption capacity of SiO2-NH2/PSF-g-PMAA for amlodipine in methanol with 1.4 mg/mL at 15 °C is 137 mg/g. The adsorption ability increases with the decrease of ionic strength and temperature via the hydrogen bond and ionic interactions, and the adsorption of ADP by SiO2-NH2/PSF-g-PMAA is consistent with the D-R adsorption isotherm model. Thermodynamic parameters imply that adsorption is a spontaneous and exothermic process.
研究领域:
材料科学
·
高分子化学
·
环境科学
·
化学工程
·
膜技术
·
吸附科学
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS RESEARCH
·
2021
·Vol. 36
·期 8
·1705-1717
·
IF 3.089
Yang Shuo,Li Zhiwen,Zhang Wenmeng,Lin Meijin,Chen Dongyang
The thermal and chemical stabilities are two key factors limiting the commercial application of superhydrophobic coatings. Herein, a thermally and chemically stable fluorinated poly(aryl ether) (FPAE) was used for the first time to construct superhydrophobic coatings by a facile solution spraying process. Distinct nanosheet structures were formed for the FPAE, which after the incorporation of SiO 2 and carbon nanotube (CNT) turned into a hydrangea -like structure with high roughness and low surface energy. As a result, superhydrophobic coatings were obtained with the water contact angle (WCA) reaching about 170° and the rolling off angle (RA) reaching less than 1°. The superhydrophobicity was maintained after a variety of rigorous tests, including high-temperature baking, acidic and alkaline solution immersions, ultrasonic treatments, friction evaluations, etc. The self-cleaning, anti-corrosion, and oil–water separation capabilities of the FPAE/SiO 2 /CNT coating were successfully demonstrated. Therefore, the FPAE is a promising resin for the preparation of low-cost and high-performance superhydrophobic coatings. Graphic abstract
研究领域:
材料科学
·
表面工程
·
化学工程
✓ 已验证
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2015
·
IF 2.711
Lihong Wu,Yifeng Zhou,Wangyan Nie,Linyong Song,Pengpeng Chen
In this study, teardrop-shaped SiO 2 /TiO 2 nanoparticles (TST-NPs) with core–shell structure were fabricated from tetraethoxysilane (TEOS) and tetrabutyl titanate (TBT) by sol–gel method. And these nanoparticles were characterized by transmission electron microscopy (TEM), scanning electron microscopy (SEM), Fourier transform infrared (FT-IR), thermogravimetric analysis (TGA), X-ray photoelectron spectroscopy (XPS), and UV–vis spectroscopy. Photocatalytic activity of teardrop-shaped SiO 2 /TiO 2 nanoparticles after calcination (CST-NPs) was studied towards degradation of methylene blue under sunlight irradiation. The result showed that CST-NPs possessed good photocatalytic activity. The photocatalytic mechanism was also studied by adding different capture agent. Results showed that addition of 0.003 M of I − decreased the degradation of MB more than same amount of Ag + , indicating that the photogenerated holes may play a more essential role than photoinjected electrons in the oxidation of MB.
研究领域:
材料科学
·
纳米技术
·
光催化
·
环境化学
✓ 已验证
DOI
高影响因子
Journal of Energy Storage
·
2019
·
IF 3.517
Ying Zhang,Jiasheng Zhang,Xiangqi Li,Xiao Wu
Lauric acid (LA)/SiO 2 shape-stabilized phase change materials (PCMs) were fabricated by a facile one-pot method involving co-hydrolysis and co-condensation process of tetraethylorthosilicate (TEOS) and methyltriethoxysilane (MTES). With increasing the volume ratio of MTES to TEOS, the surface of LA/SiO 2 PCMs changed from hydrophilic to highly hydrophobic, and the melting latent heats decreased from 93.8 J/g to 60.3 J/g. These composite PCMs exhibited high thermal stability and effective storage of the latent heat, demonstrating suitable for applications in regulation and maintenance of temperature.
研究领域:
材料科学
·
能源工程
✓ 已验证
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2015
·
IF 2.711
Haibin Wang,Eryu Chen,Xianbu Jia,Lijun Liang,Qi Wang
Superhydrophobicity is extensively investigated because of the numerous methods developed for water-repellant interface fabrication. Many suitable functional materials for the production of superhydrophobic surfaces on various substrates are still being explored. In this study, inorganic SiO 2 and organic polytetrafluoroethylene (PTFE) nanoparticles (NPs) are used for a comparative study on the performance of superhydrophobic coating on carbon steel surfaces. The NPs are added to PTFE coating emulsions by physical blending to form coating mixtures. Raw SiO 2 NPs are then hydrophobized using KH-570 and validated by Fourier transform-infrared spectroscopy (FT-IR) and Dynamic Laser Scattering (DLS) grain size analyses. The microstructures of the surfaces are characterized by contact angle (CA) measurements and field emission-scanning electron microscope (FE-SEM) images. The prepared surfaces are subjected to adhesion, hardness, water resistance, and acid/alkali erosion tests. Hydrophobized SiO 2 -filled coating surfaces are found to have better uniformity than raw SiO 2 regardless of their similar maximum static contact angles (SCAs) about 150°. A SCA of 163.1° is obtained on the PTFE NP-filled coating surfaces that have a considerably denser structure than SiO 2 . Thermogravimetric (TG) and differential scanning calorimetry (DSC) analyses reveal that all fabricated surfaces have good thermal stability and tolerate temperatures up to 550 °C. The PTFE NP-filled coating surfaces also exhibit excellent water and acid resistance. A possible mechanism concerning the amount of trapped air is proposed in relation to practical superhydrophobic surface fabrication.
研究领域:
材料科学
·
表面工程
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry C
·
2019
·Vol. 7
·期 48
·15233-15242
·
IF 6.641
Yang Chen,Ning Wang,Martin Jensen,Shan Han,Xianfeng Li,Wei Li,Xingxiang Zhang
One-dimensional (1D) SiC nanostructures have attracted considerable interest owing to their unique structure and excellent performance, but nanostructure entanglement limits their application. In this work, a robust photocatalytic composite SiC@SiO2/carbon nanofiber mat (SiC@CNFMs) is prepared via facile and environmentally friendly blow-spinning (BLS) followed by calcination in absence of metal catalysts. The several hundred micron long as-prepared nanocrystal structures consist of a single-crystalline β-SiC core (diameter between 30–150 nm) and an ultra-thin (8 nm) amorphous SiO2 shell layer. The growth process of the SiC/SiO2 nanofiber is in good agreement with the vapor–solid (VS) mechanism. The synthesized SiC@CNFMs exhibit excellent photodegradation of dyes and due to the utilization of PAN-based carbon nanofiber mats, they show good recycling performance with a dye degradation above 88–95% after 5 cycles. Lastly, the synthesized SiC@CNFMs show high chemical stability under both alkaline and acidic conditions. From these properties, the synthesized SiC@CNFMs show promising potential for wastewater cleaning.
研究领域:
材料科学
·
纳米技术
·
环境工程
·
光催化
✓ 已验证
DOI
高影响因子
PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS
·
2023
·
IF 1.7
Li-Peng Qiu,Yu-Rui Zhang,Shi-Long Gao,Quan-Hao Zheng,Ting-Ting Zhang,Guo-Ting Cheng,Shi-ze Cao,Wen-Peng Hang,Seeram Ramakrishna,Yun-Ze Long
In this work, the magnetic properties of Bi 2 Sr 2 CaCu 2 O 8+θ (BSCCO) superconducting nanofibers prepared by solution blow spinning technology were studied systematically. The BSCCO superconductors were doped with SiO 2 nanoparticles in order to study the influence of non-superconducting impurities on the microstructure and magnetic properties of superconductors. The results showed that 0.2 wt% SiO 2 nanoparticles can improve superconducting performance as efficient magnetic flux pinning centers in BSCCO superconductors. For examples the superconducting transition temperature was increased from 76.5 K to 80.3 K, the critical current density was increased from 0.68 × 10 8 A m −2 to 1.43 × 10 8 A m −2 , and the pinning strength was increased from 4.4 × 10 7 N m −3 to 8.1 × 10 7 N m −3 . In addition, it was found that appropriate amount of SiO 2 nanoparticles can improve the size of superconducting grains and enhance the connectivity of superconducting grains. Moreover, the pinning mechanism of each sample demonstrated that SiO 2 nanoparticles improved the pinning performance of BSCCO. Furthermore, this is the first report on the BSCCO superconductors that doped with SiO 2 nanoparticles.
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Nano Materials
·
2023
·
IF 5.9
Xiaohan Meng,Ze Lv,Liyin Shi,Tianzhen Jiang,Shaoyang Sun,Yan Li,Jianguo Feng
Residues of pyrethroid pesticides in aquatic environments seriously threaten aquatic organisms and the human health. Herein, a novel highly dispersed and recyclable composite ZIF-8 and SiO2 double-layer-modified Fe3O4 nanoparticle, named Fe3O4@ZIF-8@SiO2 nanoparticle, was synthesized via a layer-by-layer assembly method to remove pyrethroid insecticides (namely, fenvalerate, β-cyfluthrin, and tetramethrin) from water. The physical properties of the Fe3O4@ZIF-8@SiO2 nanoparticles were characterized via scanning electron microscopy, elemental mapping, energy-dispersive X-ray spectroscopy, X-ray diffraction, Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, inductively coupled plasma spectroscopy, thermogravimetric analysis, Brunauer–Emmett–Teller surface area analysis, dispersion analysis, and vibrating sample magnetometry. The prepared Fe3O4@ZIF-8@SiO2 nanoparticles exhibited excellent adsorption performance and high dispersibility and could be rapidly separated from water using an external magnetic field. The Fe3O4@ZIF-8@SiO2 nanoparticles exhibited the strongest adsorption effect at an adsorbent dosage of 10 mg, an adsorption time of 40 min, and a pH of 7. The fitted model for the adsorption process was consistent with the proposed secondary kinetic model and Sips isotherm model. The Fe3O4@ZIF-8@SiO2 nanoparticles exhibited maximum adsorption capacities of 316.23, 364.43, and 258.69 mg g–1 for fenvalerate, β-cyfluthrin, and tetramethrin, respectively. The Fe3O4@ZIF-8@SiO2 nanoparticles retained most of their adsorption capacity after five reuse cycles when acetone was used as an eluent for desorption. The mechanisms involved in the adsorption process included π–π stacking interactions, hydrogen bonds, hydrophobic interactions, and pore filling effects. This study provides a potential design for rapidly recoverable and reusable nanoparticles that can be used to effectively adsorb pyrethroid insecticides in wastewater.
✓ 已验证
产品关联
DOI
高影响因子
CHEMOSPHERE
·
2023
·
IF 8.8
Zhenzhen Liu,Huiyu Zhao,Jiao Wang,Zhiwei Wang,Shanshan Di,Hao Xu,Qiang Wang,Xinquan Wang,Peipei Qi
A biosafe magnetic Fe 3 O 4 @SiO 2 @Salg (GMS) was successfully developed via a simple and economic method. Fe 3 O 4 @SiO 2 particles were selected as the magnetic core, and they directly interacted with sodium alginate, thus mitigating the use of cross-linking agents. The microstructure, properties, and formation mechanism of GMS were examined using FE-SEM, TEM, VSM, TGA , zeta potential , and FT-IR. The as-developed GMS was used as a desirable adsorbent to remove organophosphorus pesticides (OPPs) from water bodies, and the influence of different factors on the removal efficiencies of OPPs was investigated. Optimal preparation conditions were determined, and the excellent removal efficiencies of the 18 OPPs were achieved in this study (80.5%–100% for tap, river, and seawater). After the GMS was recycled eight times, the removal efficiencies of 18 OPPs were maintained at >80%. Adsorption kinetics and isotherm models showed that the adsorption process was accurately fitted with the Langmuir isotherm and pseudo-second-order models. The values of ΔG , ΔH , and ΔS were negative, indicating that the OPPs were adsorbed on the GMS spontaneously via an exothermal reaction, and chemisorption was the dominant adsorption mechanism. Overall, the as-developed GMS was biosafe as revealed by cytotoxicity experiments. GMS had good environmental security, stability, and reusability, and it exhibited excellent potential for removing OPPs from aqueous solutions without causing secondary pollution.
✓ 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）