CATALYSIS LETTERS
·
2019
·Vol. 150
·期 5
·1462-1470
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IF 2.372
Zhang Minhua,Qin Yu’nan,Tan Xuechao,Wang Lingtao,Yu Yingzhe,Jiang Haoxi
Abstract In this paper, the MgO–SiO 2 catalyst was prepared with the deposition–precipitation method, which was used to catalyse the conversion of ethanol to 1,3-butadiene through a two-step process. The carbon deposition deactivation of the catalyst was mainly caused by that the carbon species occupied the acid-basic active sites on the catalyst surface. The carbon deposition mainly includes chain alkanes and aromatic compounds from outer to inner layers, and its site was mainly MgSiO 3 , followed by MgO, while SiO 2 showed weak carbon deposition ability. Graphic Abstract
研究领域:
催化化学
·
材料科学
✓ 已验证
DOI
高影响因子
PROGRESS IN ORGANIC COATINGS
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2024
·
IF 6.5
Qian Chen,Xixun Shen,Zuogui Zhang,Qunjie Xu
To solve the problem of icing on the wind turbine blades, here an anti-icing coating composed of PDMS and PVDF as organic bonding frameworks, GPE, MWCNTs , and modified SiO 2 nanoparticles as functional doping phases is synthesized through a one-step spraying method. The coating exhibits excellent superhydrophobic properties with a large contact angle of about 167.0° and a low sliding angle of4.0° and excellent photothermal and electrothermal properties. Under light and electric heating conditions, the coating can be rapidly heated to a high temperature level of about 68.4 °C at 81 s and 48.5 °C at <61 s, respectively. The static water droplet icing experiment shows that the coating can effectively delay the freezing time and reduce the adhesion strength of ice. The freezing rain experiment further showed that under the coordination of photothermal and electrothermal, freezing rain droplets will not freeze on the coating, indicating an excellent anti-icing ability. Meanwhile, the coating also exhibits a superior de-icing ability under the coordination of photothermal and electrothermal. In addition, various performance experiments, including acid and alkali immersion, friction and wear, and impact experiment are also performed to demonstrate the excellent stability and durability of the coating.
研究领域:
材料科学
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能源工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2019
·
IF 4.175
Wei Wang,Jiaojiao Fang,Hu Chen
Mesoporous materials offer attractive routes for designing photocatalysts with nano-confined structures, high activities, and recyclability. Here we take the core-shell and mesoporous SiO 2 nanoparticles as the template for the in situ synthesis of nano-confined g-C 3 N 4 with controllable structures and quantum size effects by varying the precursor species and concentrations. Results indicate that decrease the cyanamide, the precursor, concentration will improve the specific surface area, adsorption ability, and quantum size effect of the final photocatalysts. Cyanamide aqueous solution with a weight ratio of 50.0 wt% results in the most active photocatalyst containing 31.17 wt% of the confined g-C 3 N 4 with a tetracycline degradation rate of 6.63 times higher than that of the cyanamide-derived bulk g-C 3 N 4 (C) under the xenon lamp irradiation. Replacing the cyanamide with urea can further improve the photocatalytic activity even the more active SiCN(U10) contains only 12.47 wt% of the confined g-C 3 N 4 . The improved photocatalytic activity is resulted from the synergistic effects of the high adsorption ability, low aggregation, enhanced quantum size effect, and more exposed active sites. The present study gives new sight on improving the aqueous phase recyclability of the few-layered and high-reactive g–C 3 N 4 –based photocatalysts, and may promote its industrial application process.
研究领域:
材料科学
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环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2023
·
IF 9.5
Ruyue Guo,Yan Bao,Xi Zheng,Jie Chen,Hong Yang,Wenbo Zhang,Chao Liu,Jiachen Xu
The self-cleaning coating has both superhydrophobic physical and photocatalytic chemical self-cleaning properties, which has attracted the wide attention of researchers in recent years. First, the flower-like hollow SiO2@TiO2 spheres with oxygen vacancies (rFHSTs) were prepared by the liquid-phase reduction method, in which several different functional components were integrated. Meanwhile, the influence mechanisms of the physical structure and chemical composition on the photocatalytic properties are discussed in detail. The results proved that rFHSTs exhibited the enhanced photoresponse range and photocatalytic degradation performance in visible light because of the synergistic effect of the microstructure (internal cavity, 3D flower-like nanosheet), SiO2/TiO2 heterojunction structure, and oxygen vacancies. After that, superhydrophobic modified rFHSTs were used as fillers to fabricate PVA/PFDTS-rFHSTs composite coatings with both physical and chemical self-cleaning properties. The self-cleaning performances and principles of the composite coating were examined and explored. The results showed that the low surface energy of the hydrophobic chain segment, the inherent particle effect, and the photocatalytic activity of rFHSTs were responsible for the superhydrophobic and photocatalytic effects, finally endowing the composite coating with self-cleaning performance. In short, this study is profound for the development and application of self-cleaning coatings with both physical and chemical performances.
研究领域:
材料科学
·
表面化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2024
·
IF 4.9
Lianxia Jing,Pengyu Zhang,Yanming Chen,Yunling Gao,Junxian Yun
A superhydrophobic PDMS/DTMS-SiO 2 @PLA membrane with a porous layered three-dimensional rough structure was obtained by a simple phase separation method for the preparation of polylactic acid (PLA) membrane with the addition of a layer of functionalized DTMS-SiO 2 nanoparticles. SEM, EDS, XPS, TGA, and FTIR were used to characterize the surface morphology and chemical composition of the PDMS/DTMS-SiO 2 @PLA membrane. The static water contact angle of the modified membrane could reach 160.7°. The high hydrophobicity remained after 50 abrasion experiments, and the WCA was still greater than 150° after 4 hours of immersion in different pH solutions. For petroleum ether, n-hexane, n-heptane, and isooctane mixtures with water, the modified membrane exhibited excellent oil-water separation capabilities in separation flux and efficiency. Meanwhile, the modified membrane also has good resistance to contamination and self-cleaning ability. Due to the advantages of simple preparation, degradable materials, mechanical stability, chemical resistance, excellent oil-water separation capability, good anti-pollution, and self-cleaning ability, superhydrophobic PDMS/DTMS-SiO 2 @PLA membrane can be applied to practical oil-water separation.
研究领域:
材料科学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Yuhan Ren,Biao Zhang,Zhaoxin Zhong,Jian Ye,Jiawei Zhang,Zhiyong Fang,Feng Ye
In this study, monolithic Al 2 O 3 –SiO 2 aerogels with excellent thermal stability and high specific surface area were synthesized using boehmite nanorods (L=20–30 nm, D=3–5 nm). The high specific surface area of aerogels was maintained after calcination at 800 °C (663.54 m 2 /g), 1000 °C (486.91 m 2 /g), and 1100 °C (230.76 m 2 /g). The anti-sintering mechanism of the Al 2 O 3 -SiO 2 aerogels was discussed. Thanks to the composite of Al 2 O 3 -SiO 2 aerogel and mullite fibers, the disadvantages of brittleness and low strength of aerogel are overcome. The thermal conductivity of the composite is extremely low at 0.034 W/(m·K)-0.089 W/(m·K) (25 °C-1000 °C). Five muffle cycle back-temperature tests at 1000 °C and a butane blowtorch back-temperature test at 1350 °C also proved that the composites have excellent thermal insulation properties. Composites with excellent thermal insulation properties combined with lightweight, thinness, machinability, and good dielectric properties meet the need for high-temperature thermal insulating-wave transmitting integrated materials for hypersonic missile radomes.
研究领域:
材料科学
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航空航天工程
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2013
·
IF 2.112
Yaohui Xu,Yang Zhou,Wenhui Ma,Shixing Wang,Shaoyuan Li
The Fe 3 O 4 nanoparticles [NPs] coated with silica nanoparticles were designed to produce magnetic core–shell Fe 3 O 4 @SiO 2 NPs, which were modified with rhodamine B derivatives and defined as Fe 3 O 4 @SiO 2 -Rho NPs. The obtained Fe 3 O 4 @SiO 2 -Rho NPs served as a fluorescent OFF-ON nanosensor was utilized to detect Zn 2+ selectively in acetonitrile medium. The Fe 3 O 4 @SiO 2 -Rho NPs exhibited selective “turn-on” type fluorescent enhancements and distinct color changes with Zn 2+ . The Fe 3 O 4 @SiO 2 -Rho NPs also showed a high capacity for removal of Zn 2+ at room temperature. The removal efficiency toward Zn 2+ was about 87.34%. In addition, the presence of magnetic Fe 3 O 4 particles as core in Fe 3 O 4 @SiO 2 -Rho NPs could facilitate the magnetic separation of the Fe 3 O 4 @SiO 2 -Rho-Zn 2+ from the solution.
研究领域:
分析化学
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材料科学
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环境科学
✓ 已验证
DOI
高影响因子
POLYMER COMPOSITES
·
2019
·Vol. 40
·期 12
·4588-4596
·
IF 2.268
Caixia Chu,Heyi Ge,Kaili Zhang,Nianliang Gu,Shanshan Liu,Chaosheng Jin
The poor interface of carbon fiber (CF) reinforced composites has long been one that researchers want to facilitate. A hierarchical structure of nano-SiO 2 and small-sized graphene oxide (sGO) on CF was constructed by a layer-by-layer method. The electrochemically treated CF was evenly coated with sGO sheets as a medium layer, which made nano-SiO 2 uniformly spread over CF by electrostatic adsorption. The hierarchical structure could provide the synergistic reinforcement on the mechanical properties of CF composite by improving interface adhesion, mechanical interlocking, and chemical bonding. The interlaminar shear strength value of SiO 2 -sGO-CF/epoxy composite reached 71.1 MPa, which was increased by 33.45% compared with the electrochemical etching CF/epoxy composite. The results show that the sizing of sGO and nano-SiO 2 plays a positive synergistic effect by hierarchical reinforcement.
研究领域:
材料科学
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复合材料工程
✓ 已验证
产品关联
DOI
高影响因子
Inorganic Chemistry Frontiers
·
2016
·Vol. 3
·期 5
·663-670
·
IF 4.532
Weiqiang Li,Xiao Ge,Hao Zhang,Qianqian Ding,Hualin Ding,Yunxia Zhang,Guozhong Wang,Haimin Zhang,Huijun Zhao
Ideally, a superior catalyst should possess high speed, selectivity and stability. However, it is difficult to holistically achieve high speed, selectivity and stability catalysis with modest configured catalyst structures. This work reports a new pre-shell/post-core approach combined with a laser ablation treatment strategy to fabricate a sophisticated catalyst architecture configured with a hollow mesoporous SiO2 (hm-SiO2) sphere shell and multiple encapsulated Ag nanoparticle (NP) yolks (Ag@hm-SiO2). Each Ag@hm-SiO2 nanosphere encapsulates 5–10 Ag NP yolks with an average size of 20 nm, in which the content of silver is about 3.6 wt% based on the inductively coupled plasma measurement. To further enhance the catalytic activity, a laser ablation treatment strategy is innovatively utilized to reduce the sizes of the encapsulated Ag NP yolks and increase their numbers. The catalytic reduction of 4-nitrophenol (4-NP) is used to evaluate the catalytic performance of the fabricated Ag@hm-SiO2 catalyst architecture before and after laser ablation treatment. The laser ablation treated Ag@hm-SiO2 nanospheres demonstrate a three-fold increased catalytic activity towards 4-NP reduction with excellent stability. Such superior catalytic performance could be attributed to the unique structural features of the Ag@hm-SiO2 architecture, in which the mesopore shell provides not only readily accessible pathways for fast transport of reactants to the encapsulated Ag NPs but also an effective protective shield for the encapsulated Ag NPs.
研究领域:
催化
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纳米材料
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化学工程
✓ 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.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2023
·
IF 5.2
Lipei Fu,Ziran Zhang,Xinxin Qiu,Yufei Zheng,Minglu Shao,Yingrui Bai,Zhangkun Ren,Wenzhe Si,Jiafeng Jin,Yanyu Xu,Kaili Liao
A novel rapidly switchable CO 2 /N 2 -responsive Pickering emulsifier based on supramolecular amphiphilic surfactants (SDOA) and nano-SiO 2 has been fabricated. SDOA was constructed by mixing Jeffamine D-230 and oleic acid (HOA) at 1:1 stoichiometric ratio. Compared with conventional small-molecule emulsifiers, the novel rapidly switchable CO 2 /N 2 -responsive Pickering emulsifier was prepared with inexpensive raw materials by a simple method, and there was no contaminant generation during synthesis. A new CO 2 /N 2 -responsive Pickering emulsion was prepared on this basis, and its stable performance and responsiveness were investigated in depth. The results show that this emulsion can be stable for a long time (more than 30 days) at a low surfactant dosage (0.5 mmol/L) through in situ hydrophobization of SiO 2 nanoparticles by hydrogen bonding and electrostatic adsorption. In addition, the emulsion broke rapidly and completely after 10 s of CO 2 introduction into the stable emulsion, and the emulsion could be reconstructed in response to N 2 purging for 5 min at 60 ℃ followed by homogenization . The switching behavior of the emulsion is due to decomposition of the pseudo amphiphile by bubbling CO 2 into the system and both the protonated D-230 ions and the neutral HOA produced have no in situ hydrophobization to SiO 2 particles. At 60 ℃, the influx of N 2 will drive out CO 2 , making HOA re-transform into hydroxide ion, and after re-combining with D-230 ion, it can again perform in-situ hydrophobization on SiO 2 particles, thus forming a stable emulsion. Thanks to the ability of SiO 2 nanoparticles and D-230 ions to maintain electrostatic adsorption after the passage of CO 2 , compared with previous studies, the emulsion can be completely demulsified at a higher pH value (about 5.5), fewer bicarcarbonate roots are formed, less CO 2 needs to be introduced, and N 2 required to re-stabilize the emulsion is also reduced. This greatly increases the response efficiency of the emulsion and reduces the energy loss and the cost of putting the emulsion system into practical application. This research has important implications for fossil fuel generation, production and transportation of crude oil, and other areas.
研究领域:
化学工程
·
材料科学
·
界面科学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Bio Materials
·
2025
·
IF 4.7
Yanxia Zhang,Nazakaiti Imamaimaiti,Xiaohui Tang,Jua Kim,Tao Jiang,Huiting Fu,Haobo Pan,Yingbo Wang
Poly(L-lactic acid) (PLLA) is a promising material for bone substitutes due to its biodegradability and biocompatibility. However, its limited osteogenic activity and antibacterial properties restrict its applications. To address these challenges, this study develops PLLA/SiO2@ZnO/PDA/PLL composite fibrous materials using an approach that integrates electrospinning with ultrasonic techniques. The composite exhibits photothermal antibacterial functionality and osteoinductive properties. The material demonstrates excellent hydrophilicity, sustained-release capability, and antibacterial activity. Upon near-infrared light exposure, Zn2+ ions are released, disrupting bacterial membranes via electrostatic interactions and lipid peroxidation induced by reactive oxygen species. This dual mechanism leads to bacterial membrane rupture and biofilm degradation. Zn2+ ions also interfere with bacterial respiratory enzymes, disrupting the electron transfer process and achieving efficient antibacterial effects. The composite further shows outstanding biocompatibility and osteoinductivity, promoting vascular endothelial cell and osteoblast adhesion and enhancing calcium-phosphate salt deposition. In vivo studies confirm its safety with no significant toxicity or adverse effects on tissues and organs. This PLLA/SiO2@ZnO/PDA/PLL composite offers significant potential for repairing infected bone tissue and provides a strong foundation for future applications in bone tissue engineering.
研究领域:
生物医学工程
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材料科学
·
骨组织工程
✓ 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）