Surfaces and Interfaces
·
2023
·
IF 6.2
Ziwei Gao,Shurao Cai,Daomin Min,Yutao Hao,Minzun Ji,Qingzhou Wu,Shengtao Li,Wenfeng Liu
Polymer dielectric materials are crucial for storage devices in power and electronic systems, as well as electric vehicles, due to their high energy density and fast discharge rates. Polymer nanocomposites (PNCs) possess superb electrical and energy storage properties, making them highly promising as next-generation thin-film dielectrics for energy storage. The excellent performance of PNCs derive from the interfacial region introduced by nano-doping. However, the current measurement equipment and technology make it difficult to accurately obtain the mesoscopic scale distribution characteristics of the conductivity of the interfacial region, and are also impossible to clarify the formation mechanism of deep traps in the interfacial region. We employed high-throughput simulation and experiment to investigate the mesoscopic conductivity and trap distribution properties of the interfacial region in PNCs. Furthermore, we developed a three-dimensional mesoscopic conductivity distribution simulation model of PNCs containing polymer matrix, nanoparticles, and interfacial region. The interfacial region size and conductivity distribution of the PNCs were determined by comparing with the experimental results, and the mesoscopic distribution characteristics of the interfacial traps in PNCs were obtained. It is proved that the nanofillers form a condensed structure with high order and compactness by restraining the movement of molecular chains, which deepens the trap energy in the interfacial region and restricts the free volume expansion. This results in the formation of interfacial regions with low conductivity, contributing to enhancing energy storage performance.
研究领域:
材料科学
·
电气工程
✓ 已验证
产品关联
DOI
高影响因子
INORGANIC CHEMISTRY COMMUNICATIONS
·
2023
·
IF 3.8
Hai Liang,Xinyu Feng,Xiuyuan Zuo,Zhihan Zhu,Siman Yang,Baowei Zhu,Wanting Wang,Jingjing Zhang,Gang Li
MgO-modified biochar (MgO-BC) has demonstrated enormous potential for practical application of Cd(Ⅱ) removal from wastewater. Exceptionally numerous MgO adsorption sites and enhanced porosity of MgO-BC are both critical for efficiency Cd(Ⅱ) removal. However, the pursuit of high-content of MgO while maintaining unobstructed pore structure remains a challenge due to the blockage of BC pores by the MgO particles. Herein, we demonstrated that Mg(NO 3 ) 2 can synergistically enhance the porosity and MgO active site of biochar attributing to the oxidation of nitrate. The prepared MgO-BC exhibits highly porous framework structure. Remarkably, further adsorption results indicate the MgO-BC has outstanding adsorption capacity of Cd(Ⅱ) in solution. The immobilized contaminant Cd(Ⅱ) onto MgO-BC was predominantly attributable to the chemical and physical interaction, including ion exchange, cation-π interaction, surface complexation and electrostatic interaction. This strategy demonstrates a novel route to develop efficient adsorbents by tailoring structure and metal oxide via nitrate activation.
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
Nanomaterials
·
2023
·Vol. 13
·期 5
·885
·
IF 5.3
Xingzhen Liu,Weijin Qian,Yawei Chen,Mingliang Dong,Taxue Yu,Weijun Huang,Changkun Dong
CNTs and CNT-MgO, CNT-MgO-Ag, and CNT-MgO-Ag-BaO nanocomposites were grown on alloy substrates using an electrophoretic deposition method and their field emission (FE) and hydrogen sensing performances were investigated. The obtained samples were characterized by SEM, TEM, XRD, Raman, and XPS characterizations. The CNT-MgO-Ag-BaO nanocomposites showed the best FE performance with turn-on and threshold fields of 3.32 and 5.92 V.μm−1, respectively. The enhanced FE performances are mainly attributed to the reductions of the work function, and the enhancement of the thermal conductivity and emission sites. The current fluctuation of CNT-MgO-Ag-BaO nanocomposites was only 2.4% after a 12 h test at the pressure of 6.0 × 10−6Pa. In addition, for the hydrogen sensing performances, the CNT-MgO-Ag-BaO sample showed the best increase in amplitude of the emission current among all the samples, with the mean INincreases of 67%, 120%, and 164% for 1, 3, and 5 min emissions, respectively, under the initial emission currents of about 1.0 μA.Keywords:CNT-MgO-Ag-BaO nanocomposite;electrophoretic deposition;field emission;tensile test;stability;hydrogen sensing
研究领域:
材料科学
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纳米技术
·
物理化学
✓ 已验证
DOI
PubMed
高影响因子
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
·
2019
·Vol. 125
·期 3
·158
·
IF 1.784
Gao Dong-Sheng,Gao Xiang-Dong,Wu Yong-Qing,Zhang Tong-Tong,Yang Jing-Nan,Li Xiao-Min
Co doped BaSnO 3 films [BaSn 1 − x Co x O 3 (0 ≤ x ≤ 0.50), i.e., BSCO] have been grown on MgO single-crystal substrates via pulsed laser deposition. Effects of the Co-doping level on the crystallinity, the microstructure, and optical properties of the BSCO films are investigated. All the BSCO films are of high crystallinity and grown epitaxially on MgO substrates. The lattice parameter of the (200) plane drops linearly with the increase of the ‘ x ’ value. The Co doping is found to increase the film roughness and the grain size, and a RMS roughness of 8.33 nm and grain size up to 100 nm are observed in the film with x = 0.50. The low Co-doping level ( x = 0.05, 0.1) has slight anti-reflection effects on the incident visible light, and the Co-doping level higher than 0.2 reduces the optical transmittance significantly. The optical bandgap shows a first-rising then falling trend with the increase of the Co content, and the lowest bandgap of 1.94 eV is realized in the BSCO film with x = 0.50.
研究领域:
材料科学
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凝聚态物理
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薄膜制备
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光学材料
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功能氧化物
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Zitao Shi,Zixuan Fang,Shuren Zhang,Bin Tang
Monoclinic Sm 2 O 3 ceramics were prepared using the conventional solid-state sintering method. The influences of sintering temperature on structure, morphology, and performance of Sm 2 O 3 ceramics were studied systematically. The excellent microwave dielectric properties ( ε r = 21.95, Q × f = 47,000 GHz, and τ f = +30.15 ppm/°C) were achieved in Sm 2 O 3 ceramic sintered at 1550 °C for 4 h. Interestingly, varying degrees of cracking were observed after the sintered samples were placed for a short time, with the extent depending on the sintering temperatures. The reasons for cracking were analyzed through chemical bond characteristics and microstructure. The analysis of bond valence and microstructure revealed that Sm 2 O 3 ceramics sintered at higher temperatures exhibited larger bond strain index, global instability index, and interplanar spacings. These results suggest that the cracking of Sm 2 O 3 ceramics originates from inner stress resulting from structural variations caused by variations in sintering temperatures. The effect of MgO addition on microwave dielectric properties and stability of Sm 2 O 3 ceramics was also investigated. Phase identification and elemental distribution indicated that MgO existed as a secondary phase. The Sm 2 O 3 ceramic with 20 wt% MgO addition exhibited optimal microwave dielectric properties: ε r = 17.72, Q × f = 61,100 GHz, and τ f = +2.4 ppm/°C. Importantly, cracking was not observed when MgO addition amounts were 5 wt% or higher. The attractive microwave dielectric properties and favorable stability confirm the possibility of the 5G applications for Sm 2 O 3 /MgO composite ceramics.
研究领域:
材料科学
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电子材料
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DOI
高影响因子
CATALYSIS LETTERS
·
2019
·Vol. 150
·期 5
·1462-1470
·
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
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材料科学
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry C
·
2024
·Vol. 12
·期 25
·9236-9246
·
IF 5.7
Bo You,Bin Lu,Dazhen Wu,Ruijie Pei
MgO was found to be a good sintering aid for densification of several types of ceramics; however, the previous reports seldom provided persuasive evidence to support their proposed functional mechanism. In the present work, we successfully fabricated polycrystalline transparent In2O3 semiconductor ceramics using MgO as an additive and offered vital insight into the additive roles in sintering behavior and optical properties, which are conducive to mastering the microstructure evolution principle and interaction function mechanism. The oxygen defect and solute drag mechanisms have combined effects on the sintering of MgO-doped In2O3 ceramics. Additionally, MgO also helps to improve the thermal stability. At the optimized MgO content of 0.5 at%, the In2O3 ceramic sintered at 1600 °C under an oxygen atmosphere achieves an in-line transmittance of 63.0% at 633 nm (∼83% of the theoretical transmittance of a perfect In2O3 single crystal) with a fine average grain size of ∼9.7 μm. Upon deep UV excitation, the transparent In2O3 semiconductors exhibit broad spectral bands covering from the near-UV to the entire visible region, where the dominant ∼493 nm cyan light derives from the deep-level defect emission. The MgO dopants enhance the photoluminescence intensity and prolong the deep-level fluorescence lifetime. The cathodoluminescence spectra show broad orange emission, with the emission centers located at 626 and 613 nm for the intra-grain and grain-boundary regions, respectively. The integral intensity of cathodoluminescence increases as the acceleration voltage increases, while the intensity in the grain interior is much higher than that on the grain boundary at each voltage.
研究领域:
材料科学
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光学工程
✓ 已验证
产品关联
DOI
高影响因子
Nano Research
·
2016
·Vol. 9
·期 10
·3129-3140
·
IF 8.893
Li Mingming,Tang Minghui,Deng Jiang,Wang Yong
The development of novel, simple, and convenient techniques for the fabrication of porous carbon materials with desirable properties, such as tunable pore structures and the presence of nitrogen functionalities, from renewable and abundant biomasses is required. We herein describe an in situ directing method for the preparation of a nitrogen-doped flower-like porous carbon (NFPC) employing arbitrarily shaped MgO from bio-derived glucosamine chloride (GAH). Experimental evidence demonstrated that the structure directing effect of the Mg(OH) 2 nanosheets formed in situ from MgO hydrolysis was key to this process, with the original MgO morphology being irrelevant. Furthermore, this method was applicable for a wide variety of biomass-derived carbon precursors. The resulting NFPC exhibited a high nitrogen content of ≤9 wt.%, and was employed as a support to anchor small Ru nanoparticles (average size = 2.7 nm). The resulting Ru/NFPC was highly active in heterogeneous hydrogenations of toluene and benzoic acid, which demonstrated the advantages of nitrogen doping in terms of boosting catalytic performance.
研究领域:
材料科学
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2023
·
IF 5.7
Sheng-Jin He,Ling-Feng Su,Chuang-Tian Zhan,Xiu-Bin Chen,Wei-Ming Guo,Shi-Kuan Sun,Li-Xiang Wu,Jia-Xiang Xue,Hua-Tay Lin
Low-temperature joining of SiC ceramics using raw CaO-Al 2 O 3 -MgO-SiO 2 mixed powders (CAMS-P) and CaO-Al 2 O 3 -MgO-SiO 2 glass (CAMS-G) as additives for the liquid-phase sintering of SiC nanopowders (NITE phase) in combination with surface oxidation was studied. Using CAMS-P as an additive for SiC joining required 1650 °C and produced a lower shear strength of 77.2 ± 3.5 MPa, compared to untreated SiC (108.2 ± 15.8 MPa). Using CAMS-G as an additive, the compactness of SiC joints obtained at 1550 °C was higher than that of NITE joints obtained at 1650 °C with CAMS-P as an additive. Nonetheless, the low joining temperature resulted in gaps and delaminations at the interface, and the joints strength was only 48.3 ± 5.6 MPa. Incorporating CAMS-G as an additive and surface oxidation achieved reliable NITE phase joining at 1550 °C, with no observed gaps or delaminations at the interface. The resulting joints strength was as high as 100.0 ± 0.8 MPa. The joining mechanism was discussed and compared, involving microstructural analysis .
研究领域:
材料科学
·
陶瓷工程
✓ 已验证
产品关联
DOI
高影响因子
PROGRESS IN ORGANIC COATINGS
·
2017
·
IF 2.858
Xiaofeng Liao,Hongqiang Li,Lin Zhang,Xiaojing Su,Xuejun Lai,Xingrong Zeng
With the environment pollution deteriorating by industrial waste water and oil leak, superhydrophobic materials for oil/water separation have attracted more attentions and become a worldwide research hotspot. Herein, we propose a facile dipping-UV curing approach to fabricating superhydrophobic hybrid coating on polyester fabric for oil/water separation by utilizing (3-mercaptopropyl) trimethoxysilane modified graphene oxide (mGO) and vinyl-terminated polydimethylsiloxane (V-PDMS). With mass ratio of mGO to V-PDMS increasing, the roughness of the fabricated mGO/PDMS hybrid coating on polyester fabric correspondingly increased and the water contact angle (WCA) reached up to 157°, demonstrating excellent water repellency. Importantly, due to the formation of crosslinked PDMS network with mGO as crosslinking points, the fabric exhibited good thermal stability and chemical resistance. Furthermore, the superhydrophobic fabric also possessed high oil/water separation efficiency at 99.8%, and still kept at 98.4% even after 15 separation cycles. Our findings stand out as a new tool to fabricate superhydrophobic materials and coatings with graphene and its derivatives for oil/water separation, showing great potential in practical applications such as oil spill accidents and industrial sewage emissions.
研究领域:
材料科学
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环境工程
·
纳米技术
·
表面化学
✓ 已验证
DOI
高影响因子
APPLIED THERMAL ENGINEERING
·
2024
·
IF 6.1
Lisheng Deng,Shusen lin,Linfa Xiao,Mitsuhiro Kubota,Hongyu Huang,Jun Li,Dezhen Chen
The application of MgO/Mg(OH) 2 in heat storage technology has been limited due to slow hydration rate and easy agglomeration. In this paper, nanoporous carbon particle (NCP) as a carrier was used to prepare NCP/MgO chemical heat storage composite materials by impregnation and calcination methods, respectively. The microstructure characterization, hydration reaction, and simultaneous thermogravimetric analysis experiments were carried out on the prepared composite materials. The results showed that the internal distribution of MgO in the composite material prepared by calcination method was more uniform, and the particle size of MgO was smaller. Under the conditions of 110 ℃ hydration temperature and 57.8 kPa water vapor partial pressure, the hydration conversion ratio of the composite material prepared by calcination method after 120 min of hydration conversion ratio reached 93 %, which was 17.7 % higher than that of the impregnated composite material and 50 % higher than that of pure MgO. Under the comprehensive influence of specific surface area, pore structure, and active component particle size, compared with pure materials and impregnated composite materials, the dehydration rate of the composite material prepared by calcination method at 300 ℃ was twice that of impregnated method and 6 times that of pure MgO, and the heat storage density reached 1039kJ/kg. After 10 cycles, the heat storage density still maintained an initial state of 95.8 %. Compared with pure materials and impregnated composite materials, NCP/MgO composite materials prepared by calcination method had better heat storage performance and higher cyclic stability.
研究领域:
材料科学
·
能源技术
✓ 已验证
产品关联
DOI
高影响因子
POLYMER TESTING
·
2023
·
IF 5.1
Yi Ding,Wenwen Yu,Jie Zhang,Wenying Liu,Fengbo Zhu,Yanan Ye,Qiang Zheng
The Ag@MgO nanoparticles (NPs), consisting of silver NPs with a size range of 6–15 nm well-dispersed on the surface of MgO nanoparticles, were synthesized using a simple and efficient in situ synthesis method. These NPs exhibited superior antibacterial activity compared to bare MgO NPs. Subsequently, they were incorporated into poly(butylene succinate- co -terephthalate) (PBST) matrix to prepare antibacterial food packaging films. The effects of Ag@MgO NPs morphology on the compatibility, mechanical, water vapor barrier, UV blocking and antibacterial properties of PBST matrix were evaluated. Unmodified Ag@MgO NPs caused agglomeration and poor mechanical properties. However, when the Ag@MgO NPs were surface modified and interacted with the PBST matrix, the dispersion of nanoparticles and crystallinity improved, resulting in enhanced tensile strength and barrier properties of the composite films. Furthermore, the well-formed of Ag@MgO NPs in the films played a positive role in controlling the growth of microorganisms. Upon incorporation of the modified Ag@MgO NPs, the PBST nanocomposite films exhibited a 23.5% increase in the tensile strength and a 63% decrease in the water vapor permeability compared to PBST films. Moreover, the UV blocking performances were enhanced, and high antibacterial rates of 99.8% and 99.7% were achieved against E. coli and S. aureus , respectively. All the results indicate that the PBST incorporating modified Ag@MgO NPs have excellent potential for use in food packaging applications.
研究领域:
材料科学
·
生物技术
·
食品科学
✓ 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）