JOURNAL OF ALLOYS AND COMPOUNDS
·
2026
·
IF 6.7
Zhihong Wang,Tianyu Zhang,Dong Han,Wenkang Yi,Ruina Ma,An Du,Yongzhe Fan,Xue Zhao,Xiaoming Cao
Amorphous SiO 2 /MgO/MgSiO 3 coatings formed on AZ91D via MAO in TEOS electrolyte. • Due to its dense layer, this coating exhibits high corrosion resistance at 50 Hz. • Amorphous SiO 2 /MgO/MgSiO 3 coatings show optimal thermal control at 500 Hz. • Explains the growth mechanism of the coating. In this paper, AZ91D magnesium alloy is used as the substrate, and thermal control and corrosion resistant composite coatings are prepared by micro-arc oxidation technology in tetraethyl orthosilicate hydrolysis electrolyte at different pulse frequencies (50 Hz, 500 Hz, 1000 Hz, 2000 Hz). The effects of pulse frequency on the microstructure, corrosion resistance, and thermal control performance of the coatings are systematically studied. The results show that the coatings are mainly composed of SiO 2 , MgO, and MgSiO 3 . As the frequency decreases, the content of amorphous SiO 2 in the coating increases, and both the thickness and roughness increase significantly. Electrochemical tests show that the coating prepared at 50 Hz exhibits the optimal corrosion resistance, with a corrosion current density as low as 1.017 × 10⁻⁸ A/cm², and its dense inner layer resistance increases by 2.8 orders of magnitude compared with that of the coating prepared at 2000 Hz. In terms of thermal control performance, the coating at 500 Hz shows the best comprehensive thermal control performance, with an emissivity of 0.89 and an absorptivity as low as 0.30, which is attributed to the moderate thickness (about 143 μm) and roughness, the dense structure, and the intrinsically low absorptivity and high emissivity characteristics of amorphous SiO 2 . In this study, SiO 2 /MgO/MgSiO 3 composite coatings are prepared on the Mg substrate surface, which provides a new idea for the preparation of multifunctional coatings.
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DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Bingfan Li,Xiaowen Qian,Wenbo Wu,Shiyuan Liu,Shijun Wu,Jiang Han,Yong Han,Chao Yang,Tifeng Jiao
Plastic pollution and the treatment of oily wastewater have become significant challenges in the field of environmental protection. This study presents a method for fabricating electrospun membranes from waste polyethylene terephthalate (PET) beverage bottles, which are surface-modified by co -depositing tea polyphenols (TP), 3-aminopropyltriethoxysilane (APTES), and tetraethoxysilane (TEOS). The resulting superhydrophilic membrane, denoted as PET-T-100, exhibits excellent mechanical properties and structural stability due to the optimization of precursor solution composition and electrospinning parameters. The modified membrane shows a water contact angle of 0° in air and an underwater oil contact angle of 161°, demonstrating outstanding wettability. In oil-water separation experiments, PET-T-100 achieves a separation efficiency of over 99.5 % for various oil-water mixtures, and over 98 % for emulsions, maintaining stable wettability and separation performance even in harsh acidic, alkaline, and saline environments. This study provides an efficient and environmentally friendly approach for the high-value utilization of waste PET and offers a novel strategy for the development of high-performance oil-water separation membranes and environmental remediation technologies.
研究领域:
环境科学
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材料科学
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化学工程
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废水处理
·
聚合物回收
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DOI
高影响因子
PROGRESS IN ORGANIC COATINGS
·
2012
·
IF 1.977
Feigao Xu,Dan Li,Qingjian Zhang,Hean Zhang,Junying Xu
Protective agents based on tetraethoxysilane (TEOS) have been widely used for the protection of stone heritages. However, TEOS-based protective agents suffer from practical drawbacks, such as crack formation of the gel during the drying phase due to the developed capillary force, which is typical for TEOS-based protective agents. In this paper, we have prepared new TEOS-based protective agent containing flexible hydroxyl-terminated polydimethylsiloxane (PDMS-OH) and colloidal silica particles (167 nm) using n-octylamine as a catalyst in order to reduce capillary force development and increase hydrophobicity, and have characterized them for the application of stone protective agent. The extent of surface hydrophobization depends on concentration of colloidal silica particles and reaches a maximum value of 123° at 0.2% (w/v) of colloidal silica particles for the case of treated with the modified composition. The presence of n-octylamine is a key factor which promotes the increase of the gel pore size. The protective performances were also evaluated by its ability to resist acid corrosion. The results reveal that the protective effects are satisfying.
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高影响因子
CERAMICS INTERNATIONAL
·
2026
·
IF 6
Xibo Du,Zhangyang Xu,Jielei Tu,Jiahui Hou,Jiancheng Cui,Lingfu Kong,Lingxi Lei,Shengyao Huang,Kangyong Liu,Mengxing Li
Oxide composite coatings with tunable refractive index, high optical transparency and self-cleaning functionality are important for advanced glass-based optical and photovoltaic applications. In this work, TEOS-regulated TiO 2 @SiO 2 interfacial coatings were fabricated by a sol–gel dip-coating route to construct multifunctional antireflective coatings for photovoltaic glass. The effect of TEOS content on the SiO 2 shell/network formation around TiO 2 nanoparticles was systematically investigated. Increasing TEOS content improved particle dispersion, promoted TiO 2 @SiO 2 interfacial construction, reduced coating roughness and tuned the effective refractive index from 2.19 to 1.47. Based on this interfacial regulation, a three-layer coating consisting of a TiO 2 @SiO 2 bottom layer, a hybrid intermediate layer and an HMDS-modified SiO 2 top layer was designed as a multilayer optical architecture with sequential refractive-index variation. The optimized coating exhibited an average transmittance of 96.50% over 380–1800 nm. In addition, the TiO 2 -containing interfacial layer endowed the coating with photocatalytic self-cleaning behavior, enabling optical recovery after methylene-blue contamination under UV irradiation. An accelerated thermal-cycling aging test conducted in accordance with the relevant IEC 61215 procedure, together with abrasion testing, showed limited optical losses under the applied laboratory conditions. When applied to mini crystalline silicon photovoltaic modules, the coated glass increased the short-circuit current density and power conversion efficiency by 8.86% and 8.84%, respectively, in relative terms. This work demonstrates that TEOS-regulated TiO 2 @SiO 2 interfacial engineering is an effective strategy for developing self-cleaning antireflective coatings with laboratory-scale optical stability for photovoltaic cover glass.
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高影响因子
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
·
2014
·Vol. 72
·期 2
·385-393
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IF 1.547
Guo Ping,Zhai Shang-Ru,Xiao Zuo-Yi,Zhang Feng,An Qing-Da,Song Xiao-Wei
Fabrication of s uerhydrophobic materials towards oil/water separation and oil absorption has been receiving great attention nowadays, due to the significant increase of industrial oily wastewater and frequent accident of oil spill. In most previous studies, the usage of expensive precursors restricted the wide applications of prepared superhydrophobic materials. In this work, superhydrophobic filter paper, fabric and polyester sponges were fabricated by dip-coating the mixed solution of polystyrene and xerogels, which were prepared with tetraethoxysilane and polymethylhydrosiloxane, based on previous work. The as-fabricated fabric can effectively separate oil and water mixtures and possesses excellent reusability; more significantly, the materials maintained its good hydrophobic and excellent oil/water separation capacity even after ten cycles. Interestingly enough, the stability was provided, as a result, the fabric still exhibited superhydrophobic after 100 abrasion times and showed high repellency towards many liquids with different pH values. Additionally, the coated polyester sponges can quickly absorb various oil and organic liquid, which will offer a practical application for the treatment of seawater or oily wastewater. By contrast, this experiment process is simple and avoided using costly fluoro-chemicals or complicated fabrication process.
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
BULLETIN OF MATERIALS SCIENCE
·
2023
·Vol. 46
·期 2
·1-10
·
IF 1.8
Liang Dong,Xiong Sang,Zhang Xiaomeng,Ye Yuanfeng,Cao Jingxin,Hu Xingxing,Song Yao,Wei Qianwen
WO 3 :Eu 3+ powder was prepared by microemulsion method with cetyltrimethyl ammonium bromide (CTAB) as a surfactant. The prepared WO 3 :Eu 3+ samples were wrapped with SiO 2 by a coating method. The WO 3 :Eu 3+ @ SiO 2 nanocomposites with the core-shell structure were prepared by controlling tetraethyl orthosilicate (TEOS) content (1, 3, 5 and 7%) and water–alcohol ratio (1:3, 1:1.5, 1:1 and 2:1). The structure, morphology and luminescence properties of the prepared WO 3 :Eu 3+ @ SiO 2 samples were characterized by XRD, SEM, TEM and fluorescence spectra. The results show that the prepared WO 3 :Eu 3+ @SiO 2 nanocomposites are spherical and granular, and the average particle size is below 100 nm. Under the condition of different TEOS contents, the strongest characteristic peak is located at 554 nm in the green light band at the excitation wavelength of 328 nm. Among the different water–alcohol ratio conditions, the prepared WO 3 :Eu 3+ @SiO 2 nanocomposite has the strongest luminescence intensity at the water–alcohol ratio of 1:3, and the excitation wavelength is 328 nm. The excitation spectra measured at 612 nm have prominent characteristic peaks at 362, 394, 422, 465 and 499 nm, which correspond to the transition of 7 F 0 → 5 D 4 , 7 F 0 → 5 L 6 , 7 F 0 → 5 D 3 , 7 F 0 → 5 D 2 and 7 F 0 → 5 D 1 , respectively.
研究领域:
材料科学
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纳米技术
·
光学性质
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DOI
高影响因子
Desalination and Water Treatment
·
2024
·
IF 1
Song Deng,Jingrong Huang,Meng Guo,Xueni Sun,Xiuxiu Ren,Jing Zhong,Rong Xu
Novel p-phenylenediamine-bridged organosilica (PPDA-BOS-T) materials were synthesized via the co-condensation reaction assisted by tetraethyl orthosilicate (TEOS). These amino-functionalized organosilicas were characterized by Fourier transform infrared spectrometer, N 2 sorption, scanning electron microscopy, and transmission electron microscopy. The addition of TEOS played a positive role in the construction of the porous network structure of the bridged organosilicas. The saturation adsorption capacity for Ag(I) of the PPDA-BOS-T could reach 82.88 mg g –1 . The conformity to the Freundlich model indicated multilayer adsorption with active sites. Furthermore, the adsorption was followed well by the pseudo-second-order model, and the intraparticle diffusion was proved to be the rate-limiting step during the adsorption of Ag(I). Finally, the thermodynamic parameters including the change of free energy (ΔG), enthalpy (ΔH), and entropy (ΔS) of adsorption were calculated.
研究领域:
环境科学
·
材料科学
·
化学工程
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DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2015
·
IF 3.368
Ping Guo,Shangru Zhai,Zuoyi Xiao,Qingda An
Facing the issues of significant increase of industrial oily wastewater and frequent accident of oil spills, the developing of efficient and affordable absorbents for improving oil pollution is of practical significance. Herein, several superhydrophobic and superoleophilic materials, utilizing filter paper, filter cloth and polyester sponge as substrates, through facile coating of hybrid SiO 2 colloid particles from controllable PMHS–TEOS sol system were presented. These methyl-modified particles not only provided hierarchical micro/nano-scale structure with distinct roughness, but also largely lowered the surface energy of the coated substances, leading to excellent superhydrophobic and superoleophilic surfaces. The modified filter cloths could be applied for oil/water separation owing to the flexible and foldable property; sponges could efficiently absorb oil or organic solvents in situ on account of its low density and high porosity, and meanwhile the absorbed oil could be easily recollected by simple squeezing. It is worth mentioning that both modified filter cloths and sponges exhibited excellent selectivity , high efficiency, outstanding rapidity and remarkable recyclability. More importantly, after treatment of 100 abrasion cycles with metal scalpel and strongly acidic and basic water droplets, the whole WCA values of resultant filter cloths still maintained superhydrophobic character (>150°), illuminating the charming mechanical and chemical stability of sol–gel processed coating with hierarchical roughness and covalently bonded methyl groups . Combining controllable fabrication process and cheap raw precursors, this method enables scalable manufacturing of stable and superhydrophobic substances, which are promising in practical applications involved in oil/water separation and oil sorption .
研究领域:
材料科学
·
环境科学
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产品关联
DOI
PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Junjie Yan,Xiumei Wu,Qidong Liu,Yunping Li,Shu Yu
Silicon oxycarbide (SiOC) coatings were prepared through isothermal chemical vapor co-deposition by using two precursors of hexamethyldisilane (HMDS) and tetraethyl orthosilicate (TEOS). The microstructure, composition and the protectiveness on C/C composite against oxidation of the coatings prepared at temperatures ranging from 1423 K to 1563 K and pressures ranging from 500 Pa to 1200 Pa were investigated, respectively. After oxidation, cracks and defects were formed in the coatings of all conditions due to the volume shrinkage of amorphous SiO 2 crystallization and the mismatch of thermal expansion coefficient (CTE) between SiOC coatings and substrate. The most oxidation-resistant SiOC coating was obtained at 1563 K and 500 Pa, which exhibited the lowest weight loss rate of 4.87 % after 12 h of oxidation at 1673 K in air condition.
研究领域:
材料科学
·
表面工程
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产品关联
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2016
·
IF 6.333
Hailan Han,Hai Qiang Li,Meiyu Liu,Lishuang Xu,Jingmei Xu,Shuang Wang,Hongzhe Ni,Zhe Wang
A series of novel organic-inorganic crosslinked hybrid proton exchange membranes were prepared using sulfonated poly(arylene ether ketone sulfone) polymers containing carboxyl groups (C-SPAEKS), (3-aminopropyl)-triethoxysilane (KH550), and tetraethoxysilane (TEOS). KH550 acted as a “bridge” after reacting with carboxyl and sulfonic groups of C-SPAEKS to form covalent and ionic crosslinked structure between the C-SPAEKS and SiO 2 phase. The crosslinked hybrid membranes (C-SPAEKS/K-SiO 2 ) were characterized by FT-IR spectroscopy, TGA , and electrochemistry , etc. The thermal stability, mechanical properties and proton conductivity of the crosslinked hybrid membranes were improved by the presence of both crosslinked structure and inorganic phase. The proton conductivity of C-SPAEKS/K-SiO 2 -8 was recorded as 0.110 S cm − 1 , higher than that of Nafion ® (0.028 S cm − 1 ) at 120 °C. Moreover, the methanol permeability of the C-SPAEKS/K-SiO 2 -8 was measured as 3.86 × 10 −7 cm 2 s − 1 , much lower than that of Nafion ® 117 membranes (29.4 × 10 −7 cm 2 s − 1 ) at 25 °C.
研究领域:
材料科学
·
化学工程
·
电化学
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产品关联
DOI
高影响因子
MICROPOROUS AND MESOPOROUS MATERIALS
·
2019
·
IF 4.182
Fuxiang Feng,Xiaopo Niu,Li Wang,Xiangwen Zhang,Qingfa Wang
Ni/ZSM-5 nanosheet catalysts with different Si/Al ratios were modified by chemical liquid deposition (CLD) of tetraethoxysilane (TEOS) to tailor their acid spatial distribution. Their catalytic performance was evaluated with the hydroconversion of oleic acid to aviation-fuel-range-alkanes (AFRAs) at different reaction temperatures and H 2 pressures. The modified catalysts inherit the nanosheet structure with decreased external Brønsted acid concentration, especially the strong one. External Brønsted acid sites mainly favor the cracking of the deoxygenated products (C 17 /C 18 ). Internal Brønsted acid sites mainly enhance the isomerization of the linear AFRAs. And the catalytic activity of the external Brønsted acid sites was more sensitive to reaction temperature than that of the internal ones. The deoxygenation and cracking reactions were also more sensitive to H 2 pressure compared to the isomerization reaction. High AFRA selectivity of 51.4% as well as high iso/n -alkanes ratio of 1.7 were achieved at 250 °C and 10 bar over NS200(1).
研究领域:
催化化学
·
能源化学
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DOI
高影响因子
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
·
2019
·Vol. 92
·期 1
·134-145
·
IF 1.986
Xia Lijian,Yao Binbin,Shi Hao,Shi Zhekun,Wang Wenpin,Kan Ze
In this paper, we report the fundamental method for controlling monodispersed silica nanoparticles size ranged from 10 to ~135 nm assisted by lysine or lysine hydrochloride, during which the seed regrowth technique was utilized. The synthesis was prepared in the water-base system, which was environment friendly and convenient. According to our research, the influence factors of co-solvent system, molar content of additional TEOS, and molar ratio composition of additional TEOS/seeds were confirmed. The final morphology and size of silica nanoparticles can be tuned by changing the amount of additional TEOS and the seeds size. To guarantee the monodispersity of final particles. In the regrowth process, cyclohexane used as the co-solvent floated on the surface of water to block additional TEOS contact with water directly, and made the silicate intermedium consumable for the growth of the parent particles immediately, while not forming new nucleation. In such a condition, to lower the cost and prepare mass production, the lysine was replaced by lysine hydrochloride, meanwhile, triethylamine was introduced to neutralize the hydrochloride. It should be noted that as the particle size increased to be more than 100 nm, when usinglysine hydrochloride and triethylamine, the types of nitrogen adsorption–desorption isotherms changed from H1 to H3; in contrast, the isotherms of the particles were changed from H2 to H1 when catalyzed by lysine.
研究领域:
材料科学
·
纳米技术
·
化学
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）