CONSTRUCTION AND BUILDING MATERIALS
·
2022
·
IF 7.693
Zenggang Zhao,Shaopeng Wu,Quantao Liu,Chao Yang,Yingxue Zou,Pei Wan
Asphalt aging seriously decreases the pavement performances and service life of asphalt pavement. Previous studies have indicated that CeO 2 nanoparticles reveal ultraviolet light absorption characteristics. While the function mechanism of CeO 2 nanoparticles to asphalt is still not clear. To further enrich the types of aging-resistant agent and extend the service life of asphalt, the influence of CeO 2 nanoparticles on the aging resistance of asphalt was explored in this paper. The optical characteristics of CeO 2 nanoparticles crystal and layered double hydroxides (LDHs) crystal were analyzed by ultraviolet visible spectrophotometer. CeO 2 nanoparticles modified asphalt and LDHs-modified asphalt were prepared and phase segregation tests were performed to evaluate the compatibility of modified asphalt. Subsequently, brookfield viscometer and dynamic shear rheometer (DSR) were conducted to evaluate the viscosity and rheological properties of virgin asphalt, CeO 2 nanoparticles modified asphalt and LDHs modified asphalt before and after thin film oven test (TFOT), pressure aging vessel (PAV) and ultraviolet (UV) aging. And their functional group characteristics and micromorphology were investigated through fourier transform infrared spectrometer (FTIR) and atomic force microscope (AFM). The results show that CeO 2 nanoparticles mainly absorb ultraviolet light, while LDHs mainly reflects ultraviolet light. The storage stability of CeO 2 nanoparticles modified asphalt is slightly lower than that of LDHs modified asphalt, but the storage stability of the two modified asphalt met the specification requirements. Incorporating CeO 2 nanoparticles to asphalt can augment the viscosity and complex modulus of asphalt and strengthen its anti-aging ability, especially for anti-ultraviolet aging. There is not new absorption peak on the infrared spectrum of CeO 2 nanoparticles modified asphalt binder after the modification, which illustrates that modification of CeO 2 into asphalt is considered to be a physical process. Moreover, LDHs modified asphalt demonstrates superior anti-aging effect than that of CeO 2 nanoparticles modified asphalt. Overall, CeO 2 nanoparticles can also be used as an aging-resistant agent of asphalt.
研究领域:
材料科学
·
土木工程
✓ 已验证
产品关联
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2024
·
IF 7.4
Yongjian Wang,Xiaogang Luo
The high electronegativity and solubility of fluoride ions (F - ) in water at low concentrations pose challenges for their treatment and recovery. To effectively adsorb F - , cellulose beads with trapped CeO 2 nanoparticles (CeO 2 @CBs) were fabricated from a NaOH/urea aqueous solution by the optimal extrusion dropping technology. The CeO 2 @CBs exhibited a maximum removal efficiency of 99.15 % for 10.0 mg L −1 F - at 45°C, pH=3.0 and an adsorbent dose of 1.0 g. The CeO 2 @CBs were characterized using SEM-EDS, FT-IR, XRD , and XPS . These findings demonstrate that CeO 2 nanoparticles were uniformly entrapped in cellulose beads and reveal that the removal mechanism involves anionic exchange and electrostatic attractions between protonated hydroxyl on CeO 2 @CBs surface and F - . The results show that the anion competition sequence that affects the F - adsorption efficiency was Cl −
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
PROGRESS IN ORGANIC COATINGS
·
2024
·
IF 6.5
Weiping Zheng,Lifeng Hao,Yang Zhou,Bin Gu,Zewen Jiang,Yujie Fang
To fulfill practical demands for metal protection, a more in-depth exploration of the corrosion resistance of cerium dioxide nanoparticles (CeO 2 NPs) is essential. In this work, biomimetic porous CeO 2 NPs, featuring a high concentration of oxygen vacancies , were synthesized using a sol-gel method. Biomimetic porous CeO 2 NPs, characterized by the presence of oxygen vacancies , served as nanocontainers for benzotriazole (BTA) loading. Following this, TEOS-BTA@CeO 2 NPs were prepared by introducing tetraethyl orthosilicate (TEOS), a TEOS film encapsulating BTA@CeO 2 . Through electrochemical and salt spray testing, the 3 % TEOS-BTA@CeO 2 coating demonstrated superior corrosion resistance for the substrate when compared to both the 3 % CeO 2 coating and the 3 % BTA@CeO 2 coating. Throughout the entire corrosion process, the intelligent release of BTA facilitated by the TEOS film, coupled with the reduction in corrosion current due to oxygen vacancies serving as electron-capturing centers in cerium oxide, further enhances the corrosion resistance of CeO 2 NPs. This work marks a significant advancement in the exploration of nanocomposites for the practical utilization of CeO 2 NPs in combating metal corrosion.
研究领域:
材料科学
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腐蚀与防护
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2014
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IF 3.552
Zhisong Lu,Cuiping Mao,Mei Meng,Sangui Liu,Yunli Tian,Ling Yu,Bai Sun,Chang Ming Li
To endow silk with UV-shielding ability and antibacterial activity, CeO 2 nanoparticles were immobilized on silk surface via a dip-coating approach without changing silk structure. Surface density of the nanoparticles could be easily adjusted by controlling the number of dip-coating cycle. Enhanced thermal stability of the modified silk is exhibited in thermogravimetric analysis (TGA) and derivative thermogravimetric analysis (DTG). The excellent UV-protection ability and antibacterial property of the CeO 2 nanoparticle-coated silk are demonstrated in UV–vis diffuse reflectance spectroscopy and colony-forming capability test, respectively. Based on the data, it can be concluded that CeO 2 nanoparticles could be used as a very promising coating material to modify silk for UV-protection and antibacterial applications.
研究领域:
材料科学
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纺织工程
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纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2021
·Vol. 139
·期 4
·51529
·
IF 3.125
Zhi-gang Yuan,Mohamadou Al Hassan,Zhi-cheng Wang,Jun-yi Wang,Jun Wang,Mehdi Derradji,Wen-bin Liu
Nanoparticles have been widely used in the improvement of the mechanical and thermal properties of the epoxy matrix. In this study, the room temperature curing agent composed of acrylic acid and 2,4,6-trimethyl-m-phenylenediamine was mixed with different concentrations of CeO 2 nanoparticles into the epoxy resin (E51) to obtain a nanocomposite that can be rapidly molded and cured. Fourier transform infrared spectroscopy and differential scanning calorimetry were used to study the curing behavior of nanocomposites and E51 with the synthesized hardener. Through tensile, flexural, and impact tests, the influence of the nanoparticles content on the mechanical and thermal properties of the prepared composites was discussed. The results showed that the curing process was completed in 4 h. An increase of 78.4% in tensile strength, 81.7% in flexural strength, and 122.0% in elongation were obtained for the cured nanocomposite having 5 wt% CeO 2 loading compared to the neat resin. Thermogravimetric analysis result showed that the thermal stability increased with increasing of CeO 2 nanofillers content. Finally, the scanning electron microscope revealed the fracture surface morphology of the composites.
研究领域:
材料科学
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化学工程
✓ 已验证
DOI
高影响因子
WEAR
·
2021
·
IF 3.892
Shifan Li,Conglin Dong,Chengqing Yuan,Shutian Liu,Xiuqin Bai
The water-lubricated polymer stern tube bearing is a key-component which has great influences on operational reliability and safety of marine power systems . The poor thermal conductivity and frictional heat generated by friction easily cause severe deforming behaviours on the polymer bearing contacting surfaces, and lead to the high coefficient of friction as well as fluctuations. Therefore, for figuring out the tribological properties of polymer matrix composites after being modified by nano-fillers and conducted aging treatments, an array of high density polyethylene (HDPE) composites composed with CeO 2 were manufactured and tested on a commercial tribo-tester. The results showed that the CeO 2 nano-particles had a significant effect on the anti-aging property of HDPE and affected its tribology properties. Compared with the pure HDPE, CeO 2 nano-particles could reduce the COF after aging, and the COF reduction rate reached maximum to 46.6% after aging for 25 d. The CeO 2 nano-particles reduced the internal molecular chain fractures of the modified polymer under aging conditions, and slowed down the descending trends of the typical physical properties of polymer. The tribology properties of the modified polymer were enhanced by CeO 2 nano-particles compared with the pure HDPE, and the reinforcement model was disclosed in the end. The knowledge gained herein will be useful for designing a new water lubricated bearing polymer with good anti-aging property for extending its applications under extreme circumstances.
研究领域:
材料科学
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海洋工程
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2022
·
IF 9.136
Manyi Chen,Jianquan Luo,Yinhua Wan,Xiangrong Chen,Xinquan Liang
Constructing an interlayer in the thin-film nanocomposite (TFN) membranes has been proved to be an effective strategy to break the trade-off between permeability and selectivity. The interlayer plays an important role in the formation of polyamide (PA) layer. In this study, cerium oxide (CeO 2 ) nanoparticles with three shapes, including sphere, rod and flake were used to fabricate the interlayers of TFN membranes. The effects of nanoparticle shape and loading on the morphologies and properties of the interlayers and resultant TFN membranes were systematically investigated. The results showed the morphologies and physicochemical properties of the PA layers could be regulated well by the shape and loading of CeO 2 nanoparticles. The surface morphologies of the TFN membranes exhibited the transformation from nodule structure to ridge-valley structure. At the same time, the introduction of interlayer made PA layer coarser, the pore size smaller and the pore distribution more uniform. Under the same loading conditions, the rodlike CeO 2 nanoparticles tended to form a homogeneous network-like interlayer due to the large specific surface area and good dispersion. The interlayer reduced the transport path of water molecules in the PA layer based on the “gutter” effect, thus improving the permeability of TFN membrane. The water permeability of the TFN membrane with rodlike CeO 2 interlayer could be 124% higher than that of the control, while the rejection of salts did not significantly change. This study deepens our understanding on the role of nanoparticle in regulating the morphologies and properties of interlayer and TFN membrane, and provides an effective method to enhance separation performance of nanofiltration membrane.
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
CHEMISTRY-A EUROPEAN JOURNAL
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2017
·Vol. 23
·期 44
·10690-10697
·
IF 5.317
Yue Yu,Li Gao,Xianchun Liu,Yuanhong Wang,Shuangxi Xing
Graphical In the frame : Incorporating CeO 2 nanoparticles in zeolitic imidazolate framework-8 (ZIF-8) followed by high-temperature pyrolysis generated CeO 2 @N-doped carbon materials (see figure), which showed excellent activity in the oxygen reduction reaction, high tolerance to methanol crossover, and high stability. Incorporation of CeO 2 nanoparticles into the cavity of zeolitic imidazolate framework-8 (ZIF-8) was followed by high-temperature pyrolysis to generate CeO 2 @N-doped carbon materials. Introduction of the CeO 2 nanoparticles greatly enhanced the catalytic activity of the ZIF-8-derived carbon materials in the oxygen reduction reaction (ORR) owing to the presence of Ce 3+ and oxygen vacancies with high content of chemisorbed oxygen in CeO 2 and the well-maintained skeleton of the original ZIF-8 with uniform mesoporous structure. The material treated at 900 °C (CeO 2 @N-C-900) showed excellent ORR catalytic activity in both acidic and alkaline electrolyte. The ORR onset and half-wave potentials of CeO 2 @N-C-900 were 1.003 and 0.908 V versus RHE, respectively, in 0.1 m KOH aqueous solution, which are comparable to those of Pt/C catalysts. Furthermore, it exhibited much better stability and methanol crossover tolerance than Pt/C, indicative of its good potential for applications in energy conversion.
研究领域:
材料科学
·
化学
✓ 已验证
DOI
高影响因子
INORGANIC CHEMISTRY
·
2025
·
IF 4.7
Xuan Miao,Xiao Bai,Peng Zhang,Bolong Wang,Shuyan Wang,Yuzhu Yang,Zenggang Lin,Sixia Li,Binbin Wang,Weisheng Liu
Incorporating two-phase heterojunctions with matching band structures represents a promising strategy for developing photocatalysts with enhanced efficiency. This work prefers a novel approach that employs a template-assisted strategy based on a porous structured UCCN@CeO2 0D/2D S-scheme heterojunction. The proposed method aims to improve photocatalytic activity by harnessing the synergistic effects of monodispersed CeO2 nanoparticles and ultrathin N-defect CN nanosheets. The catalyst demonstrates a remarkable photocatalytic hydrogen evolution rate, reaching an impressive value of 5.59 mmol h–1 g–1 when subjected to simulated sunlight irradiation. Furthermore, the photocatalyst maintains a substantial activity level, yielding 2.35 mmol h–1 g–1 under visible light (≥400 nm). The significant improvement in the photocatalytic performance of the UCCN@CeO2 catalyst is attributed to the unique structural design and effective charge separation facilitated by the S-scheme mechanism. Kelvin probe force microscopy, theoretical calculations, and femtosecond transient absorption spectroscopy affirm the efficient charge transportation across the catalyst interface. Additionally, electron spin resonance spectroscopy measurements further support the charge transfer pathway in the S-scheme. This research presents an innovative approach for designing and developing CN-based catalysts featuring S-scheme heterojunctions, aiming to improve their efficiency and practical use in photocatalytic applications.
研究领域:
材料科学
·
催化化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Analytical Methods
·
2017
·Vol. 10
·期 1
·76-83
·
IF 1.9
Xue Jiao,Wanyi Liu,Di Wu,Wenhao Liu,Hongjie Song
The development of highly efficient nanomaterial-based mimetic enzymes is much needed to replace natural enzymes due to their low cost, high stability and efficient catalytic ability. Herein, multiple Mo-doped CeO2 nanoparticles (Mo/CeO2 NPs) with different molar ratios of Mo were synthesized using a facile microwave-assisted method. For characterizing the as-prepared Mo/CeO2 NPs, XRD, TEM, HRTEM, BET and XPS have been performed systematically. The peroxidase-like activity of Mo/CeO2 NPs was investigated, and they exhibited enhanced peroxidase-like activity in comparison to that of pure CeO2 NPs, the best peroxidase-like activity was obtained for the Mo/CeO2 NPs when the molar ratio of Mo was 9%. On the basis of the high activity of Mo/CeO2 NPs, the reaction provides a simple, sensitive and selective method for colorimetric detection of glucose with the detection limit of 4 × 10−7 mol L−1 and in a dynamic range from 5 × 10−7 to 5 × 10−5 mol L−1. This work will pave a way for high throughput synthesis of other ultra-small doped metal oxide nanoparticles, which have bright prospects in biomedical analysis.
研究领域:
生物医学分析
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材料科学
·
酶工程
✓ 已验证
产品关联
DOI
高影响因子
BIOSENSORS & BIOELECTRONICS
·
2013
·
IF 5.437
Xiaohua Li,Zhujun Zhang,Liang Tao
Triacetone triperoxide (TATP) is relatively easy to make and has been used in various terrorist acts. Early but easy detection of TATP is highly desired. We designed a new type sensor array for H 2 O 2 . The unique CL sensor array was based on CeO 2 nanoparticles' membranes, which have an excellent catalytic effect on the luminol–H 2 O 2 CL reaction in alkaline medium . It exhibits a linear range for the detection of H 2 O 2 from 1.0×10 −8 to 5.0×10 −5 M ( R 2 =0.9991) with a 1 s response time. The detection limit is 1.0×10 −9 M. Notably, the present approach allows the design of CL sensor array assays in a more simple, time-saving, long-lifetime, high-throughput, and economical approach when compared with conventional CL sensor. It is conceptually different from conventional CL sensor assays. The novel sensor array has been successfully applied for the detection of TATP at the scene.
研究领域:
分析化学
·
爆炸物检测
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2024
·
IF 12.2
Dan Su,Xiaoyan He,Jiangwei Zhou,Chengqing Yuan,Xiuqin Bai
Biofilms adhering to different surfaces have significant negative impacts in various fields. Cerium oxide nanoparticles can serve as mimics of haloperoxidase for biological biofilm inhibition applications. The regulation of the exposed facet of CeO 2 nanoparticles influences their efficiency in various catalytic processes. However, there is still a lack of systematic studies on the facet-dependent haloperoxidase-like activity of CeO 2 . In the present study, the facet-dependent haloperoxidase activities and antibiofilm performance of CeO 2 nanoparticles were elucidated through experiment analysis and density function theory calculation. The as-prepared CeO 2 nanoparticles inhibited bacterial survival and catalyzed the oxidative bromination of quorum sensing signaling molecules, achieving biofilm inhibition performance. The antibacterial and biofilm formation suppression abilities were consistent with their haloperoxidase activities. The {111}- and {110}-facet CeO 2 nanopolyhedra, as well as the {110}- and {100}-facet CeO 2 nanorods , which had higher haloperoxidase activity showed better antibiofilm performance than the {100}-facet CeO 2 cubes. The present findings provide a comprehensive understanding of the facet-dependent haloperoxidase-like activity of CeO 2 . Furthermore, engineering CeO 2 morphologies with different crystal facets may represent a novel method for significantly adjusting their haloperoxidase-like activity.
研究领域:
材料科学
·
微生物学
·
催化化学
✓ 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）