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Enhanced furfural hydrogenation via Ru nanoparticles supported on CeO2-Mg(OH)2composite nanosheet 认领 引用
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作者 Xiao-jun ZHAO Li-qiang WANG +3 位作者 Guang-ji ZHANG Yin FANG You-nian LIU Tie-chui YUAN 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2026年第4期1258-1268,共11页
Ru nanoparticles(NPs)supported on CeO2-Mg(OH)2 composite nanosheets,donated as Ru/CeO2-Mg(OH)2,are developed as the highly active catalyst for selective hydrogenation of furfural to furfuryl alcohol.Charac... Ru nanoparticles(NPs)supported on CeO2-Mg(OH)2 composite nanosheets,donated as Ru/CeO2-Mg(OH)2,are developed as the highly active catalyst for selective hydrogenation of furfural to furfuryl alcohol.Characterization results demonstrate that Ru NPs are adsorbed on the surface of the polyhedra of CeO2,which are scattered on the surface of the thin Mg(OH)2 nanosheets.Ru/CeO2-Mg(OH)2-0.2 achieves 92.6%conversion of furfural and 96.3%selectivity to furfuryl alcohol.Ru/CeO2-Mg(OH)2-0.2 retains high activity after six cycles,due to the introduction of CeO2 to form composite support that effectively prevents the leaching of Ru NPs.The strong metal-support interaction(SMSI)between Ru NPs and the CeO2-Mg(OH)2 composite support can tune the electronic structure of Ru NPs,which facilitates the H2 activation.Moreover,the CeO2-Mg(OH)2 interface exhibits specific adsorption of C=O bonds compared to the CeO2 alone.The composite-supported nanoparticles provide a valuable strategy for constructing highly efficient hydrogenation catalysts. 展开更多
关键词 Ru nanoparticles CeO2-Mg(OH)2composite support hydrogenation of furfural strong metal-support interaction electronic structure regulation
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Fabrication of carbon-coated V2O5-x nanoparticles by plasma-enhanced chemical vapor deposition for high-performance aqueous zinc-ion battery composite cathodes 认领 引用 被引量：1
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作者 Canglong Li Tao Liao +7 位作者 Dongping Chen Tiancheng You Xiaozhi Jiang Minghan Xu Huaming Yu Gang Zhou Guanghui Li Yuejiao Chen 《Chinese Chemical Letters》 SCIE CAS CSCD 2025年第12期404-409,共6页
The insulating nature and dissolution of vanadium-based oxides in aqueous electrolytes result in low capacity and lifespan during charge/discharge process, which is unable to meet the demands for the development and a... The insulating nature and dissolution of vanadium-based oxides in aqueous electrolytes result in low capacity and lifespan during charge/discharge process, which is unable to meet the demands for the development and application of high-energy-density aqueous zinc-ion batteries(AZIBs). Herein, a novel V2O5-x@C composite cathode consisting of conductive carbon coatings with abundant oxygen vacancies is specifically designed through plasma-enhanced chemical vapor deposition(PECVD) method. As expected,the ideal microstructure of V2O5-x@C cathode enables large specific surface areas, fast electron/ion diffusion kinetics, and superior interfacial stability, which can realize outstanding cycling stability and electrochemical performance. Consequently, the V2O5-x@C composite cathode delivers a high reversible rate capacity of 130.6 mAh/g at 10 A/g and remains 277.6 mAh/g when returned to 1 A/g. In addition, the Zn//V2O5-x@C full cell can stably cycle for 1000 cycles with a high initial specific capacity of 149.2 m Ah/g,possessing 83.8% capacity retention at 5 A/g. The process of constructing a conductive layer on the surface of cathode materials while increasing oxygen vacancies in the structure through PECVD provides new insight into the design of high-performance cathode materials for AZIBs. 展开更多
关键词 Aqueous Zn-ion batteries V2O5-x@C nanoparticles Carbon-coating Chemical vapor deposition Composite cathodes
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PREPARATION OF POLYSTYRENE/SiO2COMPOSITE NANOPARTICLES BEARING SULFONIC GROUPS ON THE SURFACE VIA EMULSION COPOLYMERIZATION USING A POLYMERIZABLE EMULSIFIER 认领 引用 被引量：2
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作者 Yi-zhang Chen Zhao-xia Guo +1 位作者 Jian Yu Mao-sheng Zhan 《Chinese Journal of Polymer Science》 SCIE CAS 2009年第5期629-637,共9页
Functionalized PS/SiO:composite nanoparticles bearing sulfonic groups on the surface were successfully synthesized via emulsion copolymerization using a polymerizable emulsifier ar olefin solfonate(AOS).As demonstrate... Functionalized PS/SiO:composite nanoparticles bearing sulfonic groups on the surface were successfully synthesized via emulsion copolymerization using a polymerizable emulsifier ar olefin solfonate(AOS).As demonstrated by transmission electron microscopy and atomic force microscopy,well-defined core-shel]PS/SiO:composite nanoparticles with a diameter of 50 nm were obtained.Sulfonic groups introduced onto the surface of the composite nanoparticles were quantified by FTIR.and can be controlled to some extent via a two-stage procedure. 展开更多
关键词 PS/SiO2composite nanoparticles Polymerizable emulsifier Core-shell structure Sulfonic functionalization.
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Preparation of Supermacroporous Composite Cryogel Embedded with SiO_2 Nanoparticles 认领 引用 被引量：4
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作者 许潘萍 姚雨辰 +2 位作者 沈绍传 贠军贤 姚克俭 《Chinese Journal of Chemical Engineering》 SCIE EI CAS 2010年第4期667-671,共5页
Supermacroporous composite cryogels embedded with SiO2 nanoparticles were prepared by radical cryogenic copolymerization of the reactive monomer mixture of acrylamide（AAm） and N,N-methylene-bis-acrylamide（MBAAm） c... Supermacroporous composite cryogels embedded with SiO2 nanoparticles were prepared by radical cryogenic copolymerization of the reactive monomer mixture of acrylamide（AAm） and N,N-methylene-bis-acrylamide（MBAAm） containing SiO2 nanoparticles（mass ratios of nanoparticles to the monomer AAm from 0.01 to 0.08） under the freezing-temperature variation condition in glass columns.The properties of these composite cryogels were measured.The height equivalent to theoretical plate（HETP） of the cryogel beds at different liquid flow rates was determined by residence time distribution（RTD） using tracer pulse-response method.The composite cryogel matrix embedded with the mass fraction of SiO2 nanoparticles of 0.02 presented the best properties and was employed in the following graft polymerization.Chromatographic process of lysozyme in the composite cryogel grafted with 2-acrylamido-2-methyl-1-propanesulfonic acid（AMPSA） was carried out to evaluate the protein breakthrough and elution characteristics.The chromatography can be carried out at relatively high superficial velocity,i.e.,15 cm·min-1,indicating the satisfactory mechanical strength due to the embedded nanoparticles. 展开更多
关键词 composite cryogel SiO2 nanoparticle protein chromatography
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Synthesis and Characterization of Superparamagnetic Fe3O4@SiO2Core-Shell Composite Nanoparticles 认领 引用 被引量：4
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作者 Meizhen Gao Wen Li +2 位作者 Jingwei Dong Zhirong Zhang Bingjun Yang 《World Journal of Condensed Matter Physics》 CAS 2011年第2期49-54,共6页
The Fe3O4@SiO2 composite nanoparticles were obtained from as-synthesized magnetite (Fe3O4) nanoparticles through the modified St?ber method. Then, the Fe3O4 nanoparticles and Fe3O4@SiO2 composite nanoparticles were ch... The Fe3O4@SiO2 composite nanoparticles were obtained from as-synthesized magnetite (Fe3O4) nanoparticles through the modified St?ber method. Then, the Fe3O4 nanoparticles and Fe3O4@SiO2 composite nanoparticles were characterized by means of X-ray diffraction (XRD), Raman spectra, scanning electron microscope (SEM) and vibrating sample magnetometer (VSM). Recently, the studies focus on how to improve the dispersion of composite particle and achieve good magnetic performance. Hence effects of the volume ratio of tetraethyl orthosilicate (TEOS) and magnetite colloid on the structural, morphological and magnetic properties of the composite nanoparticles were systematically investi-gated. The results revealed that the Fe3O4@SiO2 had better thermal stability and dispersion than the magnetite nanoparticles. Furthermore, the particle size and magnetic property of the Fe3O4@SiO2 composite nanoparticles can be adjusted by changing the volume ratio of TEOS and magnetite colloid. 展开更多
关键词 Magnetite Nanoparticles Fe3O4@SiO2 Composite Nanoparticles Dispersion Thermal Stability Particle Size Magnetic Property
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Thermal and Structural Analyses of PMMA/TiO2Nanoparticles Composites 认领 引用 被引量：3
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作者 Nabawia A. El-Zaher Mohamed S. Melegy Osiris W. Guirguis 《Natural Science》 2014年第11期859-870,共12页
In the present work, composites of poly (methyl methacrylate)itanium oxide nanoparticles (100/0, 97.5/2.5, 95/5, 92.5/7.5, 90/10 and 0/100 wt/wt%)were prepared to be used as bioequivalent materials according to their ... In the present work, composites of poly (methyl methacrylate)itanium oxide nanoparticles (100/0, 97.5/2.5, 95/5, 92.5/7.5, 90/10 and 0/100 wt/wt%)were prepared to be used as bioequivalent materials according to their importance broad practical and medical applications. Thermal properties as well as X-ray diffraction analyses were employed to characterize the structure properties of such composite. The obtained results showed variations in the glass transition temperature (Tg), the melting temperature (Tm), shape and area of thermal peaks which were attributed to the different degrees of crystallinity and the existence of interactions between PMMA and TiO2 nanoparticle molecules. The XRD patterns showed sharpening of peaks at different concentrations of nano-TiO2 powder with PMMA. This indicated changes in the crystallinity/amorphosity ratio, and also suggested that the miscibility between the amorphous components of homo- polymers PMMA and nano-TiO2 powder is possible.The results showed that nano-TiO2 powder mix with PMMA can improve the thermal stability of the homo-polymer under investigation, lead- ing to interesting technological applications. 展开更多
关键词 Poly(methyl methacrylate) Nano-Titanium Dioxide Powder PMMA/TiO2 Nanoparticle Composites Differential Scanning Calorimetry (DSC) Thermogravimetric Analysis (TGA) X-Ray Diffraction (XRD)
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Decorating MXene with tiny ZIF-8 nanoparticles:An effective approach to construct composites for water pollutant removal 认领 引用 被引量：2
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作者 Chen Gu Wenqiang Weng +5 位作者 Cong Lu Peng Tan Yao Jiang Qiang Zhang Xiaoqin Liu Linbing Sun 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2022年第2期42-48,共7页
MXenes have attracted increasing research enthusiasm owing to their unique physical and chemical properties.Although MXenes exhibit exciting potential in cations adsorption due to their unique surface groups,the adsor... MXenes have attracted increasing research enthusiasm owing to their unique physical and chemical properties.Although MXenes exhibit exciting potential in cations adsorption due to their unique surface groups,the adsorption capacity is limited by the low specific surface area and undeveloped porosity.Our work aims at enhancing the adsorption performance of a well-known MXene,Ti3C2Tx,for methylene blue(MB)by decorating tiny ZIF-8 nanoparticles in the interlayer.After the incorporation of ZIF-8,suitable interspace in the layers resulting from the distribution of tiny ZIF-8 appears.When employing in MB,the adsorption capacity of composites can reach up to 107 mg·g-1 while both ZIF-8(3 mg·g-1)and Ti3C2Tx(9mg·g-1)show nearly no adsorption capacity.The adsorption mechanism was explored,and the good adsorption capacity is caused by the synergistic effect of ZIF-8 and Ti3C2Tx,for neither of them is of suitable interspace or surface groups for MB adsorption.Our work might pave the way for constructing functional materials based on the introduction of nanoparticles into layered materials for various adsorption applications. 展开更多
关键词 Ti3C2Tx MXene MOF nanoparticles Adsorption Composites
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Introducing High-Volume-Fraction Ultrafine Grains to Obtain Superior Balance of Strength and Electrical Conductivity for Cu/Al2O3Composite 认领 引用
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作者 Zhang Jun Liu Xi +7 位作者 Li Yi Chang Guo Peng Haoran Zhang Shuang Huang Qi Zhao Xueni Li Liang Huo Wangtu 《稀有金属材料与工程》 SCIE EI CAS CSCD 北大核心 2025年第4期908-919,共12页
Compared with Cu/Al2O3composites,high-strength Cu/Al2O3composites usually exhibit obviously deteriorated electrical conductivity.A chemical and mechanical alloying-based strategy was adopted to fabricate u... Compared with Cu/Al2O3composites,high-strength Cu/Al2O3composites usually exhibit obviously deteriorated electrical conductivity.A chemical and mechanical alloying-based strategy was adopted to fabricate ultrafine composite powders with lowcontent reinforcement and constructed a combined structure of Cu ultrafine powders covered with in-situ Al2O3nanoparticles.After consolidation at a relatively lower sintering temperature of 550℃,high-volume-fraction ultrafine grains were introduced into the Cu/Al2O3composite,and many in-situ Al2O3nanoparticles with an average size of 11.7±7.5 nm were dispersed homogeneously in the Cu grain.Results show that the composite demonstrates an excellent balance of high tensile strength(654±1 MPa)and high electrical conductivity(84.5±0.1%IACS),which is ascribed to the synergistic strengthening effect of ultrafine grains,dislocations,and in-situ Al2O3nanoparticles.This approach,which utilizes ultrafine composite powder with low-content reinforcement as a precursor and employs low-temperature and high-pressure sintering subsequently,may hold promising potential for large-scale industrial production of high-performance oxide dispersion strengthened alloys. 展开更多
关键词 Cu/Al2O3composite ultrafine grain in-situ Al2O3nanoparticle strengthening mechanism electrical conductivity
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Host–Guest Inversion Engineering Induced Superionic Composite Solid Electrolytes for High-Rate Solid-State Alkali Metal Batteries 认领 引用 被引量：3
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作者 Xiong Xiong Liu Long Pan +6 位作者 Haotian Zhang Pengcheng Yuan Mufan Cao Yaping Wang Zeyuan Xu Min Gao Zheng Ming Sun 《Nano-Micro Letters》 SCIE EI CAS CSCD 2025年第8期278-293,共16页
Composite solid electrolytes(CSEs)are promising for solid-state Li metal batteries but suffer from inferior room-temperature ionic conductivity due to sluggish ion transport and high cost due to expensive active ceram... Composite solid electrolytes(CSEs)are promising for solid-state Li metal batteries but suffer from inferior room-temperature ionic conductivity due to sluggish ion transport and high cost due to expensive active ceramic fillers.Here,a host–guest inversion engineering strategy is proposed to develop superionic CSEs using cost-effective SiO2 nanoparticles as passive ceramic hosts and poly(vinylidene fluoride-hexafluoropropylene)(PVH)microspheres as polymer guests,forming an unprecedented“polymer guest-in-ceramic host”(i.e.,PVH-in-SiO2)architecture differing from the traditional“ceramic guest-in-polymer host”.The PVH-in-SiO2 exhibits excellent Li-salt dissociation,achieving high-concentration free Li+.Owing to the low diffusion energy barriers and high diffusion coefficient,the free Li+is thermodynamically and kinetically favorable to migrate to and transport at the SiO2/PVH interfaces.Consequently,the PVH-in-SiO2 delivers an exceptional ionic conductivity of 1.32.10−3 S cm−1 at 25℃(vs.typically 10−5–10−4 S cm−1 using high-cost active ceramics),achieved under an ultralow residual solvent content of 2.9 wt%(vs.8–15 wt%in other CSEs).Additionally,PVH-in-SiO2 is electrochemically stable with Li anode and various cathodes.Therefore,the PVH-in-SiO2 demonstrates excellent high-rate cyclability in LiFePO4|Li full cells(92.9%capacity-retention at 3C after 300 cycles under 25℃)and outstanding stability with high-mass-loading LiFePO4(9.2 mg cm−1)and high-voltage NCM622(147.1 mAh g−1).Furthermore,we verify the versatility of the host–guest inversion engineering strategy by fabricating Na-ion and K-ion-based PVH-in-SiO2 CSEs with similarly excellent promotions in ionic conductivity.Our strategy offers a simple,low-cost approach to fabricating superionic CSEs for large-scale application of solid-state Li metal batteries and beyond. 展开更多
关键词 Host–guest inversion engineering SiO2nanoparticle Superionic conductivity Composite solid electrolyte Solid-state alkali metal battery
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Novel interface regulation of Sn1.0Ag0.5Cu composite solders reinforced with modified ZrO2:Microstructure and mechanical properties 认领 引用 被引量：4
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作者 Fupeng Huo Zhi Jin +3 位作者 Duy Le Han Jiahui Li Keke Zhang Hiroshi Nishikawa 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2022年第30期157-170,共14页
With the trends of miniaturization and high density of electronic packaging,there has been an urgent demand to open up lead-free solders with high strength and ductility.In this study,a ZrO2-reinforced Sn1.0Ag0.5Cu... With the trends of miniaturization and high density of electronic packaging,there has been an urgent demand to open up lead-free solders with high strength and ductility.In this study,a ZrO2-reinforced Sn1.0Ag0.5Cu composite solder was designed.First,surface modification on ZrO2 was conducted with ball milling-pyrolysis method.Subsequently,NiO modified ZrO2(NiO/ZrO2)was added to the solder matrix with ultrasonic stirring.The morphology and interface of NiO/ZrO2 were discussed.Moreover,the microstructure,interface and mechanical properties of the composite solders were systematically studied.The results showed that NiO nanoparticles were evenly adhered to the ZrO2 surface,and the interface relationship between them was semi-coherent and coherent.Further,an appropriate addition of NiO/ZrO2 could refine the microstructure of composite solders.The refinement mechanism was systematically investigated.Besides,a micro-mechanical lock and non-micropored clean interface was formed between NiO/ZrO2 and the solder matrix.The Sn/NiO/ZrO2 interface system based on mutual solid solution was ingeniously designed.The ultimate tensile strength and elongation were increased synergistically,and the fracture mechanism transformed from a ductile−brittle mixed fracture mode to a ductile fracture mode.Therefore,a lead-free solder with high strength and ductility was obtained. 展开更多
关键词 SnAgCu composite solder ZrO2nanoparticles Refinement mechanism Surface modification Interface Reinforcements
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Sandwich-type composited solid polymer electrolytes to strengthen the interfacial ionic transportation and bulk conductivity for all-solid-state lithium batteries from room temperature to 120℃ 认领 引用
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作者 Jiewen Tan Zhen Wang +7 位作者 Jiawu Cui Zhanhui Jia Wensheng Tian Chao Wu Chengxin Peng Chengyong Shu Kang Yang Wei Tang 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2024年第8期288-295,I0007,共8页
The insurmountable charge transfer impedance at the Li metal/solid polymer electrolytes(SPEs)interface at room temperature as well as the ascending risk of short circuits at the operating temperature higher than the m... The insurmountable charge transfer impedance at the Li metal/solid polymer electrolytes(SPEs)interface at room temperature as well as the ascending risk of short circuits at the operating temperature higher than the melting point,dominantly limits their applications in solid-state batteries(SSBs).Although the inorganic filler such as CeO2nanoparticle content of composite solid polymer electrolytes(CSPEs)can significantly reduce the enormous charge transfer impedance at the Li metal/SPEs interface,we found that the required content of CeO2nanoparticles in SPEs varies for achieving a decent interfacial charge transfer impedance and the bulk ionic conductivity in CSPEs.In this regard,a sandwich-type composited solid polymer electrolyte with a 10%CeO2CSPEs interlayer sandwiched between two 50%CeO2CSPEs thin layers(sandwiched CSPEs)is constructed to simultaneously achieve low charge transfer impedance and superior ionic conductivity at 30℃.The sandwiched CSPEs allow for stable cycling of Li plating and stripping for 1000 h with 129 mV polarized voltage at 0.1 mA cm-2and 30℃.In addition,the LiFePO4/Sandwiched CSPEs/Li cell also exhibits exceptional cycle performance at 30℃and even elevated120℃without short circuits.Constructing multi-layered CSPEs with optimized contents of the inorganic fillers can be an efficient method for developing all solid-state PEO-based batteries with high performance at a wide range of temperatures. 展开更多
关键词 PEO-based solid electrolytes CeO2nanoparticles Charge transfer impedance Sandwich-type composite electrolytes All-solid-state Li metal batteries
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羟基磷灰石/γ-Fe2O3复合纳米结构的制备与表征 认领 引用
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作者 王洪新 张刚 +2 位作者 贾伟建 李彦洲 周斌军 《安阳工学院学报》 2026年第4期45-50,共6页
【目的】采用两步沉淀法合成由羟基磷灰石(HAp)和铁氧体(γ-Fe2O3)组成的复合纳米粒子。研究反应温度对复合粒子形貌的影响。【方法】通过扫描电子显微镜(SEM)、透射电子显微镜(TEM)和X射线衍射(XRD)对复合粒子进行了表征,采用超... 【目的】采用两步沉淀法合成由羟基磷灰石(HAp)和铁氧体(γ-Fe2O3)组成的复合纳米粒子。研究反应温度对复合粒子形貌的影响。【方法】通过扫描电子显微镜(SEM)、透射电子显微镜(TEM)和X射线衍射(XRD)对复合粒子进行了表征,采用超导量子干涉仪(SQUID)测量其磁性能,利用荧光探针技术检测材料细胞毒性。【结果】γ-Fe2O3纳米粒子分散在HAp基体中,当在90℃或室温下合成时,复合粒子分别具有羽毛状或球状的形貌;复合粒子表现出优异的超顺磁性特征,并且这种特性可以通过外部磁场进行控制,球形复合粒子的饱和磁化强度(Ms)最高达2.6 emu/g;细胞毒性检测表明复合粒子没有明显的细胞毒性,具有良好的生物相容性。【结论】合成的磁性磷灰石纳米材料可作为药物靶向递送载体使用。 展开更多
关键词 羟基磷灰石 γ-Fe2O3 复合纳米粒子 超顺磁性 细胞毒性
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Microstructure and Tribological Behavior of Al2O3 Particle Reinforced Al Matrix Composites Fabricated by Spark Plasma Sintering 认领 引用 被引量：1
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作者 YANG Kun AN Linan CHENG Laifei 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2019年第5期1013-1017,共5页
Nanoparticles and microparticles reinforced Al matrix composites were fabricated by spark plasma sintering, and the microstructure and tribological properties were investigated systemically. The nano-Al2O3 particle an... Nanoparticles and microparticles reinforced Al matrix composites were fabricated by spark plasma sintering, and the microstructure and tribological properties were investigated systemically. The nano-Al2O3 particle and micro-Al2O3 particle uniformly dispersed in Al matrix composites. The introduction of nanoparticles is beneficial to the decrease of friction coefficient and wear rate, while microparticles are responsible to the high friction coefficient, resulting in the abrasive wear. With the introduction of both nanoparticles and microparticles, their synergic effect will lead to the variation of tribological behavior. 展开更多
关键词 nanoparticles Al2O3 aluminum matrix composites friction and wear
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Preparation and luminescent properties of CaF_2:Ln3+(Ln:Er, Er/Yb)/Nafion composite films 认领 引用
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作者 Limei Song Jianhua Gao +3 位作者 Minmin Liang Xiaojun Li Jiangtao Li Liuchang Wang 《Journal of Rare Earths》 SCIE EI CAS CSCD 2019年第3期232-236,共5页
In this work, CaF_2:Ln3+(Ln:Er,Er/Yb)/Nafion composite films were prepared using Nafion as modifications and matrices by dripping method. The composite films were characterized by Fourier transform infrared spectro... In this work, CaF_2:Ln3+(Ln:Er,Er/Yb)/Nafion composite films were prepared using Nafion as modifications and matrices by dripping method. The composite films were characterized by Fourier transform infrared spectroscopy(FT-IR), X-ray diffraction(XRD) and scanning electron microscopy(SEM). Composite films are transparent and CaF_2:Ln3+(Ln:Er,Er/Yb) nanoparticles are well dispersed in Nafion films.The thicknesses of CaF_2:Er3+/Nafion and CaF_2:Er3+,Yb3+/Nafion composite film are about 77 and 73 μm,respectively. The nanoparticles in composite film possess cubic phase. CaF_2:Er3+,Yb3+/Nafion composite film has stronger characteristic emission of Er3+ around 1530 nm with full width at half-maximum(FWHM) of 73 nm and longer luminescence lifetimes of 22.04 μs(25.03%) and 100.77 μs(74.97%). 展开更多
关键词 CaF2 nanoparticles Photoluminescence Erbium Nafion Composite film Rare earths
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UV-Vis and Surface Photovoltage Spectra of Fe_2O_3/Polystyrene Composite Microspheres 认领 引用
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作者 QIAN Xin-ming ZHANG Xin-tong +4 位作者 SHAO Hui-bo BAI Yu-bai LI Tie-jin TANG Xin-yi DONG Shao-jun 《Chemical Research in Chinese Universities》 SCIE EI CAS 2002年第1期75-78,共4页
Fe_2O_3 sol with the particle diameter of 3-5 nm was flocculated by the addition of SDS, and the flocculate formed was redispersed by the further addition of that surfactant. Thus the surfactant bilayer was formed on ... Fe_2O_3 sol with the particle diameter of 3-5 nm was flocculated by the addition of SDS, and the flocculate formed was redispersed by the further addition of that surfactant. Thus the surfactant bilayer was formed on the surface of Fe_2O_3. The emulsion polymerization of styrene(St) adsolubilized on the surfactant adsorbed bilayer was carried out by initiator potassium persulfate(KPS). The UV-Vis and surface photovoltage spectra(SPS) indicate that the Fe_2O_3 particles were encapsulated in polystyrene(PSt) successfully. 展开更多
关键词 Fe2O3 nanoparticles Encapsulation Composite microspheres
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Nanoindentation Study on Mechanical Properties of Nano-SiO2/Dental Resin Composites 认领 引用 被引量：1
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作者 Chao Zha Jianhua Hu +7 位作者 Ainong Li Shangyu Huang Hanxing Liu Gang Chen Anqi Lei Zuoqi Zhang Bei Li Zhengzhi Wang 《Journal of Materials Science and Chemical Engineering》 2018年第4期57-64,共8页
The microano-scale indentation tests were performed to explore the performance of bisphenol-α-glycidyl methacrylate (Bis-GMA)riethylene glycol dimethacrylate (TEGDMA) dental resin composites. The effect of the fillin... The microano-scale indentation tests were performed to explore the performance of bisphenol-α-glycidyl methacrylate (Bis-GMA)riethylene glycol dimethacrylate (TEGDMA) dental resin composites. The effect of the filling content of nano-SiO2 particles on the mechanical properties of the dental composites was studied as well. The experimental results showed that the incorporation of the nano-SiO2 particles at low concentrations (up to 10 wt.%) can apparently increase the hardness and elastic modulus of the dental rein composites. The plasticity index indicates a best elastic recovery capability at a proper amount (4 wt.%) of the nanoparticles. Combined with the infrared spectrum, the mechanical enhancement mechanisms of the dental resin composites were analyzed. 展开更多
关键词 Indentation SiO2 Nanoparticles Dental Resin Composites Mechanical Properties
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原位(ZrB2+Al2O3)纳米颗粒与稀土Sc协同强化7N01铝合金的微观组织和力学性能研究 认领 引用
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作者 彭强 赵玉涛 +2 位作者 袁世宏 怯喜周 陶然 《热加工工艺》 CAS 北大核心 2026年第11期188-194,共7页
采用原位合成法制备了(ZrB2+Al2O3)/7N01-Sc复合材料,研究了(ZrB2+Al2O3)纳米颗粒和稀土Sc对复合材料微观组织及力学性能的影响。结果表明,复合添加3vol%(ZrB2+Al2O3)纳米颗粒和0.2wt%Sc后7N01铝合金的铸态... 采用原位合成法制备了(ZrB2+Al2O3)/7N01-Sc复合材料,研究了(ZrB2+Al2O3)纳米颗粒和稀土Sc对复合材料微观组织及力学性能的影响。结果表明,复合添加3vol%(ZrB2+Al2O3)纳米颗粒和0.2wt%Sc后7N01铝合金的铸态平均晶粒尺寸从104.2μm细化到18.2μm,其细化效果优于单一颗粒或稀土引入的材料;稀土Sc的引入,显著改善了材料内的粗大析出相和颗粒团簇问题;(ZrB2+Al2O3)纳米颗粒可以促进再结晶的形成,并抑制再结晶晶粒的长大;(ZrB2+Al2O3)/7N01-Sc复合材料热挤压+T6处理后的抗拉强度和伸长率分别达到655.2 MPa和21.1%,相比较7N01铝合金提高了42.2%和49.6%。(ZrB2+Al2O3)纳米颗粒和稀土Sc对复合材料的主要强化机制为Orowan强化、细晶强化和热膨胀系数强化。 展开更多
关键词 7N01铝基复合材料 原位合成 (ZrB2+Al2O3)纳米颗粒 稀土Sc 强化机制
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浓度调控对NiCo2S4/石墨烯气凝胶电化学性能的影响 认领 引用
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作者 李博霞 王晓敏 《人工晶体学报》 CAS 北大核心 2026年第6期972-980,共9页
本研究采用水热法,通过调控镍钴盐等原料的比例,制备出具有自支撑结构的镍钴硫化物/石墨烯气凝胶(NiCo2S4/GA)复合材料。运用X射线衍射(XRD)、扫描电子显微镜(SEM)等表征技术及电化学工作站对复合材料的结构、微观形貌和电化学性... 本研究采用水热法,通过调控镍钴盐等原料的比例,制备出具有自支撑结构的镍钴硫化物/石墨烯气凝胶(NiCo2S4/GA)复合材料。运用X射线衍射(XRD)、扫描电子显微镜(SEM)等表征技术及电化学工作站对复合材料的结构、微观形貌和电化学性能展开研究。结果表明,在反应物摩尔浓度比为1∶1的样品(NiCo2S4/GA-1∶1)中,NiCo2S4纳米颗粒呈现高密度均匀负载状态且无团聚现象,面积比电阻为1.99Ω·cm2;在2 A·g-1的电流密度下循环1500次后,电容保持率为70.1%。电化学动力学分析表明,NiCo2S4/GA-1∶1复合电极表现为由扩散效应主导的赝电容行为,这主要得益于石墨烯气凝胶的多孔结构,以及石墨烯片层在储能过程中对NiCo2S4电容效应的优化作用,使二者之间产生了协同效应。因此,NiCo2S4/GA-1∶1复合材料作为超级电容器电极材料具有较大的应用潜力。 展开更多
关键词 NiCo2S4/GA复合材料 水热法 自支撑结构 反应物摩尔浓度 纳米颗粒 协同效应
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Aggregation Study of Ag-TiO2 Composites 认领 引用
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作者 Maria Eugenia Noriega-Trevino Claudia Cristina Quintero-Gonzalez +3 位作者 Jose Elpidio Morales-Sanchez Jesus Maria Guajardo-Pacheco Martha Eugenia Compean-Jasso Facundo Ruiz 《Materials Sciences and Applications》 2011年第12期1719-1723,共5页
Most of the toxicity data presented in the literature are obtained in relatively simple media, like distilled water. The literature reported that nanoparticles agglomerate immediately upon being added to cell culture ... Most of the toxicity data presented in the literature are obtained in relatively simple media, like distilled water. The literature reported that nanoparticles agglomerate immediately upon being added to cell culture media and if the agglomerates are used directly in antimicrobial studies, the interpretation of the toxicity results tends to be complicated. Six different molar ratios Ag-TiO2 composites were synthesized by a reduction method using two different commercial TiO2 particles as base materials and were used to find the aggregate size in distilled water and Mueller-Hinton Broth, and to obtain the minimum inhibitory concentrations (MIC) against E. coli and E. faecalis. To evaluate the evolution of the Ag-TiO2 particle size (z-average) three dilutions of each of the synthesized composites 100 μg/ml, 250 μg/mL and 500 μg/ml were realized in deionized water and Mueller Hinton broth. It was found that Ag-TiO2 composites increased in size after being diluted in Mueller-Hinton Broth, but once they grew in size, they remained constant for 24 minutes, and after this time, did not affect the MIC for the microorganisms involved. 展开更多
关键词 Ag-TiO2 Composites Nanoparticles Particles Aggregate Size MIC
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原位纳米ZrB2颗粒与稀土Sc协同增强7N01铝合金的微观组织与拉伸性能 认领 引用 被引量：2
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作者 怯喜周 陈锐崐 +1 位作者 彭艳杰 赵玉涛 《热加工工艺》 北大核心 2025年第9期108-112,共5页
在7N01铝合金中同时引入原位纳米ZrB2颗粒和稀土元素Sc,通过原位纳米颗粒和稀土元素的协同作用来提高材料的强塑性。研究表明,向铝合金中单独引入原位纳米ZrB2颗粒的含量超过3wt%后,其团聚现象较严重,不利于复合材料性能的提高。... 在7N01铝合金中同时引入原位纳米ZrB2颗粒和稀土元素Sc,通过原位纳米颗粒和稀土元素的协同作用来提高材料的强塑性。研究表明,向铝合金中单独引入原位纳米ZrB2颗粒的含量超过3wt%后,其团聚现象较严重,不利于复合材料性能的提高。在此基础上引入稀土Sc后,原位ZrB2纳米颗粒的团聚现象得到显著改善。同时,Sc的加入还可有效改善粗大的含铁析出相,细化基体晶粒;原位纳米ZrB2颗粒和稀土Sc的协同引入使复合材料的强度和塑性较7N01基体的性能大幅提高,当ZrB2和Sc的引入量分别为3wt%和0.2wt%时,复合材料的屈服强度、抗拉强度和伸长率匹配最优,分别为447 MPa、481 MPa和9.6%,相比7N01铝合金基体的性能分别提高16.1%、11.3%和29.7%。 展开更多
关键词 7N01基复合材料 原位纳米ZrB2颗粒 稀土Sc 微观组织 拉伸性能
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