期刊文献+
共找到15篇文章
< 1 >
每页显示 20 50 100
The property of hydrogel nanocomposite by radiation methods used as bone filler and its animal trials
1
作者 Te-Hsing Wu Hong-Ru Lin Lie-Han Shen 《医用生物力学》 EI CAS CSCD 北大核心 2013年第S1期124-124,共1页
In the past,most hydrogel composites of bone repair derived from either natural or chemical synthesis were lack of mechanical strength.So we used high strengthened PAA-Ch-Si hydrogel compounds and it containing PRP(pl... In the past,most hydrogel composites of bone repair derived from either natural or chemical synthesis were lack of mechanical strength.So we used high strengthened PAA-Ch-Si hydrogel compounds and it containing PRP(platelet-rich-plasma)material.They were prepared by UV light or y-ray irradiation method for scaffold material application in this paper.We exploited nanosized silica solution,natural chitosan and acrylic acid(AAc)as starting material to synthesize chitosan/hydrogel biomedical products.This biocompatible osteoconductive scaffold mixed with platelet glue to perform the biocompatibility tests for a composite bone graft material and be ap- 展开更多
关键词 HYDROGEL chitosan SCAFFOLD biomedical silica GRAFT repair irradiation ACRYLIC SYNTHESIZE
原文传递
Effect of displacement on resistance and capacitance of polyaniline film
2
作者 Khasan Sanginovich Karimov Muhammad Tariq Saeed +1 位作者 Fazal Ahmad Khalid Syed Abdul Moiz 《Chinese Physics B》 SCIE EI CAS CSCD 2011年第4期204-208,共5页
This paper investigates the properties of displacement sensors based on polyaniline (PANI) films. About 1 wt% of PANI micropowder is mixed and stirred in a solution of 90 wt% water and 10 wt% alcohol at room tempera... This paper investigates the properties of displacement sensors based on polyaniline (PANI) films. About 1 wt% of PANI micropowder is mixed and stirred in a solution of 90 wt% water and 10 wt% alcohol at room temperature. The films of PANI axe deposited from solution by drop-casting on Ag electrodes, which are preliminary deposited on glass substrates. The thicknesses of the PANI films are in the range of 20 μm-80 μm. A displacement sensor with polyaniline film as an active material is designed and fabricated. The investigations showed that, on average, the AC resistance of the sensor decreases by 2 times and the capacitance accordingly increases by 1.6 times as the displacement changes in the range of 0 mm-0.5 mm. The polyaniline is the only active material of the displacement sensor. The resistance and capacitance of the PANI changes under the pressure of spring and elastic rubber, and this pressure is created by the downward movement of the micrometer. 展开更多
关键词 POLYANILINE DISPLACEMENT SENSOR resistance and capacitance
原文传递
Synthesis and characterization of poly(methyl methacrylate-co-polyhedral oligomeric silsesquioxane)hybrid nanocomposites
3
作者 Ben Hong Yang Hong Yao Xu +1 位作者 Cun Li Shan Yi Guang 《Chinese Chemical Letters》 SCIE CAS CSCD 2007年第8期960-962,共3页
A novel poly(methyl methacrylate-co-polyhedral oligomeric silsesquioxane) hybrid nanocomposite was synthesized by free radical polymerization and characterized by 1H NMR, 29Si NMR, and TGA technologies. Compared wit... A novel poly(methyl methacrylate-co-polyhedral oligomeric silsesquioxane) hybrid nanocomposite was synthesized by free radical polymerization and characterized by 1H NMR, 29Si NMR, and TGA technologies. Compared with PMMA homopolymer, the nanocomposite has better thermal stability. 展开更多
关键词 Poly(methyl methacrylate) Polyhedral silsesquioxane Nanoeomposite
下载PDF
Micro-Crystalline Coatings of Co-Cr Dispersed with Y_2O_3 Deposited by Series Electro-Pulse Discharge
4
作者 徐强 何业东 +3 位作者 齐慧滨 王德仁 李正伟 高唯 《Journal of Rare Earths》 SCIE EI CAS CSCD 2003年第1期64-68,共5页
A new technique-series electro-pulse discharg e (SEPD)-was developed as a kind of surface coating process. In this technique, both positive and negative poles of a pulse power were used as the depositing electrodes... A new technique-series electro-pulse discharg e (SEPD)-was developed as a kind of surface coating process. In this technique, both positive and negative poles of a pulse power were used as the depositing electrodes with the substrate allo y as an induction electrode. Micro-crystalline Co-Cr and Co-Cr dispersed wit h Y 2O 3 coatings were deposited on Fe-18Cr-8Ni stainless steel surface by using Co30Cr alloy as the depositing electrodes. Oxidation at 950 ℃ in ambie nt air shows that these coatings greatly improve the oxidation resistance of the steel. The addition of dispersed Y 2O 3 nano-particles into the alloy coati ngs was found to further reduce the scaling rate and enhance the adhesion of oxi de scales. 展开更多
关键词 metal meterials series electro-pulse d ischarge micro-crystalline coatings dispersed by rare earth oxide high-temp erature oxidation rare earths
下载PDF
Investigation of ageing effects on the electrical properties of polyaniline/silver nanocomposites
5
作者 Asma Binat Afzal Muhammad Javed Akhtar 《Chinese Physics B》 SCIE EI CAS CSCD 2011年第5期424-432,共9页
Polyaniline(PANI)/Ag nanocomposites, synthesized by incorporation of separately prepared silver nanoparticles in 1-methyl-2-pyrrolidinone(NMP) solution of PANI, have been aged at the accelerated temperature of 120... Polyaniline(PANI)/Ag nanocomposites, synthesized by incorporation of separately prepared silver nanoparticles in 1-methyl-2-pyrrolidinone(NMP) solution of PANI, have been aged at the accelerated temperature of 120℃ to simulate a storage period of 2 years at 25℃. The accelerated ageing of these materials is done by using the activation energy calculated from data collected using heat flow calorimetry (HFC). The impedance spectroscopic studies of NMP plasticized aged nanocomposite films suggest a microphase separation into reduced and oxidized repeat units. There is crosslinking of the lPANI films during ageing thereby obstructing the charge transfer between PANI chains and silver nanoparticles. As a result, the resistivity is increased. 展开更多
关键词 POLYANILINE Ag nanoparticles impedance spectroscopy ageing
原文传递
Nonlinear Optical Properties of Novel Polymeric Rare Earth Phthalocyanine Studied Using Picosecond Z-Scan Technique
6
作者 赵澎 徐松 +1 位作者 李忠玉 张复实 《Chinese Physics Letters》 SCIE CAS CSCD 2008年第6期2058-2061,共4页
Three novel tri-dimensional phthalocyanine polymers, with lanthanum (LaPPc), gadolinium (GdPPc) and ytterbium (YbPPc) as centric atoms, have been synthesized from a tetranuclear phthalonitrile. Third-order optic... Three novel tri-dimensional phthalocyanine polymers, with lanthanum (LaPPc), gadolinium (GdPPc) and ytterbium (YbPPc) as centric atoms, have been synthesized from a tetranuclear phthalonitrile. Third-order optical nonlinearities of these compounds in DMF solution are measured by a picosecond Z-sacn technique at 532 nm. It is found that all the compounds show reverse saturation absorption and nonlinear self-focus refraction effect. The second-order molecular hyperpolarizabilities are calculated to be 1.82×10^-23, 1.48×10^-23 and 1.45×10^-23 esu for LaPPc, GdPPc and YbPPc, respectively. The differences among their nonlinear optical properties are attributed to the special tri-dimensional structure and the variation in rare earth atoms. 展开更多
关键词 supernova explosion proto-neutron star shock wave
原文传递
Numerical evaluation of the effectiveness of frost heave mitigation strategies for chilled arctic gas pipelines
7
作者 XinZe Li QingBai Wu +3 位作者 HuiJun Jin Rui Shi Gang Wu YaPeng Cao 《Research in Cold and Arid Regions》 CSCD 2022年第5期338-345,共8页
To prevent the thawing of ice-rich permafrost,it is suggested that gas should be transported in a chilled state(below the freezing temperature)in pipelines buried in permafrost.However,frost heave occurs when water mi... To prevent the thawing of ice-rich permafrost,it is suggested that gas should be transported in a chilled state(below the freezing temperature)in pipelines buried in permafrost.However,frost heave occurs when water migrates towards the chilled pipeline and ice lenses grow underneath the pipe.This might endanger the integrity of the pipeline and the environment as well.Therefore,innovative frost heave mitigation measures are required when designing the pipeline,especially those sections in discontinuous permafrost or near the compressor stations.The ground temperature field in response to the operation of a proposed chilled gas pipeline traversing permafrost regions in Alaska was simulated by a pipe-soil thermal interaction geothermal model.Frost heave mitigation measures,including insulation around the pipe,flat slab insulation under the pipe,and heating cables combined with slab insulation,were evaluated for chilled pipeline operation in seasonally varying ambient temperatures.The numerical results show that the minimum temperature of the observation point at 2.5 m below the pipe bottom increases by 17%,29%,and 48%when the thermal conductivity of the outer insulation layer is 0.1,0.05,and 0.02 W/(m K),respectively.For flat slab insulation,the thermal field is less sensitive to varying slab thicknesses than to varying thermal conductivity,implying the thermal conductivity,not the thickness,is the crucial factor.Additionally,the heat flow could be redirected from vertical to horizontal by flat slab insulation.The electrical heating cables could be regarded as a new heat source to balance the heat removal rate of the soil around the chilled pipe.The minimum temperature of the observation point at 1.1 m below the bottom of the pipe increases from-15.2℃to-3.0,1.5,and 7.5℃,corresponding to the heating cable power of 20,30,and 40 W,respectively,with the power of 30 W deemed appropriate for the study case.It is concluded that heating cables in combination with insulation slabs could be adopted to regulate the temperature field around the chilled pipeline efficiently and economically.The advantages of this combination include redirecting the heat flow and eliminating frost in the soil underlying the pipe.These approaches could be considered for applications in gas pipeline projects in arctic and alpine/high-plateau permafrost regions. 展开更多
关键词 PERMAFROST Chilled gas pipeline Temperature field Numerical assessment
下载PDF
Large Third-Order Optical Nonlinearity of a Novel Copper Phthalocyanine-Ferrocene Dyad
8
作者 宾月景 徐松 +3 位作者 李忠玉 黄蕾 张智 张复实 《Chinese Physics Letters》 SCIE CAS CSCD 2008年第9期3257-3259,共3页
Third-order optical nonlinearity of a novel copper phthalocyanine-ferrocene dyad is measured by femtosecond forward degenerate four-wave mixing (DFWM) technique at 800 nm. The second-order hyperpolarizability of the... Third-order optical nonlinearity of a novel copper phthalocyanine-ferrocene dyad is measured by femtosecond forward degenerate four-wave mixing (DFWM) technique at 800 nm. The second-order hyperpolarizability of the novel copper phthalocyanine-ferrocene dyad is measured to be 1.74 ×10^-30 esu. This large and ultrafast thirdorder optical nonlinear response is mainly enhanced by the formation of intramolecular charge-transfer which can enhance the delocalized movements of the large π-electrons in the molecules. 展开更多
原文传递
双极串联脉冲放电沉积微晶涂层的高温氧化行为 被引量:1
9
作者 徐强 何业东 +3 位作者 齐慧滨 王德仁 李正伟 高唯 《中国有色金属学报》 EI CAS CSCD 北大核心 2002年第3期415-421,共7页
提出了一种以脉冲电源两极作为沉积电极 ,以被处理试样作为感应电极 ,发生串联脉冲放电沉积金属涂层的新技术。通过“针—板—针”电极放电实验证实了上述串联脉冲放电过程。采用改进的双极串联电脉冲沉积设备在 1Cr18Ni8不锈钢基体上... 提出了一种以脉冲电源两极作为沉积电极 ,以被处理试样作为感应电极 ,发生串联脉冲放电沉积金属涂层的新技术。通过“针—板—针”电极放电实验证实了上述串联脉冲放电过程。采用改进的双极串联电脉冲沉积设备在 1Cr18Ni8不锈钢基体上沉积了 1Cr18Ni8微晶涂层和弥散Y2 O3 微小颗粒的 1Cr18Ni8微晶涂层。在 95 0℃空气中进行的高温氧化实验结果表明 ,获得的 1Cr18Ni8微晶涂层极大地提高了抗高温氧化性能 ,同时还证实在微晶涂层中施加微小弥散Y2 O3 展开更多
关键词 双极串联脉冲放电 沉积 微晶涂层 高温氧化
下载PDF
Superhydrophobic Micro/Nanostructured Copper Mesh with Self-Cleaning Property for E ective Oil/Water Separation 被引量:1
10
作者 Tai-heng Zhang Tao Yan +2 位作者 Guo-qing Zhao Wenjihao Hu Fei-peng Jiao 《Chinese Journal of Chemical Physics》 SCIE CAS CSCD 2019年第5期635-642,共8页
In this work, a simple method was carried out to successfully fabricate superoleophilic and superhydrophobic N-dodecyltrimethoxysilane@tungsten trioxide coated copper mesh. The as-fabricated copper mesh displayed prom... In this work, a simple method was carried out to successfully fabricate superoleophilic and superhydrophobic N-dodecyltrimethoxysilane@tungsten trioxide coated copper mesh. The as-fabricated copper mesh displayed prominent superoleophilicity and superhydrophobicity with a huge water contact angle about 154.39° and oil contact angle near 0° Moreover, the coated copper mesh showed high separation efficiency approximately 99.3%, and huge water flux about 9962.3 L·h^-1·m-2, which could be used to separate various organic solvents/ water mixtures. Furthermore, the coated copper mesh showed favorable stability that the separation efficiency remained above 90% after 10 separation cycles. Benefiting from the excellent photocatalytic degradation ability of tungsten trioxide, the coated copper mesh possessed the self-cleaning capacity. Therefore, the mesh contaminated with lubricating oil could regain superhydrophobic property, and this property of self-cleaning permitted that the fabricated copper mesh could be repeatedly used for oil and water separation. 展开更多
关键词 SUPERHYDROPHOBICITY MICRO/NANOSTRUCTURE TUNGSTEN TRIOXIDE SELF-CLEANING Oil/water separation
下载PDF
Enviro-Friendly Synthesis of Silver Nanoparticles Using Berberis lycium Leaf Extract and Their Antibacterial Efficacy 被引量:1
11
作者 Ansar Mehmood Ghulam Murtaza +1 位作者 Tariq Mahmood Bhatti Rehana Kausar 《Acta Metallurgica Sinica(English Letters)》 SCIE EI CAS CSCD 2014年第1期75-80,共6页
In the present study, an enviro-friendly synthesis of silver nanoparticles from Berberis lycium Royle leaf extract and their antibacterial efficacy against five pathogenic bacteria were investigated. This biosynthesis... In the present study, an enviro-friendly synthesis of silver nanoparticles from Berberis lycium Royle leaf extract and their antibacterial efficacy against five pathogenic bacteria were investigated. This biosynthesis technique is proved to be advantageous over physical and chemical methods as no toxic chemicals are used. The structural and morphological characterization was made by UV-visible spectroscopy, scanning electron microscopy, and transmission electron microscopy. The synthesized nanoparticles were oval, rectangular, and spherical in shape, size ranges from 8 to 100 nm and exhibited an absorption peak at 458 nm. The biosynthesized silver nanoparticles have shown good antibacterial effect toward tested bacteria. It is believed that these biosynthesized silver nanoparticles can play a vital role in nano-based products in future. 展开更多
关键词 ANTIBACTERIAL Berberis lycium Enviro-friendly Silver nanoparticles
原文传递
Treating dye wastewater by TiO_2 coated on coal cinder
12
作者 刘建华 《Journal of Chongqing University》 CAS 2009年第3期165-169,共5页
We investigated the photocatalytic degradation of dye wastewater by using titanium dioxide (TiO2) coated on a coal cinder. The coal cinder was used as the carrier, with a thin film of TiO2 coated on it by using the ... We investigated the photocatalytic degradation of dye wastewater by using titanium dioxide (TiO2) coated on a coal cinder. The coal cinder was used as the carrier, with a thin film of TiO2 coated on it by using the sol-gel method. Using the Congo red as the model pollutant for dye wastewater, we studied the decolorization efficiency, and effects of TiO2 film thickness and roasting temperature on the efficiency. We also evaluated the recycling and regeneration of the immobilized TiO2 (TiO2/cinder). Results show that the decolorization rate of Congo red solution was more than 98% after 2.h treatment when we used TiO2/cinder calcined at 500 ℃ for 2 h and coated four times as the photocatalyst. At the same time, the TiO2/cinder remained high catalytic activity after being reused and regenerated for many times. 展开更多
关键词 titanium dioxide coal cinder Congo red dye wastewater PHOTOCATALYSIS
下载PDF
Highly bonded T-Nb2O5/rGO nanohybrids for 4 V quasisolid state asymmetric supercapacitors with improved electrochemical performance 被引量:3
13
作者 Yuzhi Jiao Haitao Zhang +3 位作者 Hailang Zhang Ao Liu Yanxia Liu Suojiang Zhang 《Nano Research》 SCIE EI CAS CSCD 2018年第9期4673-4685,共13页
Orthorhombic niobium pentoxide (T-Nb2O5)/reduced graphene oxide nanohybrids were fabricated via the hydrothermal attachment of Nb2Os nanowires to dispersed graphene oxide nanosheets followed by a high-temperature ph... Orthorhombic niobium pentoxide (T-Nb2O5)/reduced graphene oxide nanohybrids were fabricated via the hydrothermal attachment of Nb2Os nanowires to dispersed graphene oxide nanosheets followed by a high-temperature phase transformation. Electrochemical measurements showed that the nanohybrid anodes possessed enhanced reversible capacity and superior cycling stability compared to those of a pristine T-Nb205 nanowire electrode. Owing to the strong bonds between graphene nanosheets and T-Nb2O5 nanowires, the nanohybrids achieved an initial capacity of 227 mAh·g^-1. Additionally, non-aqueous asymmetric supercapacitors (ASCs) were fabricated with the synthesized nanohybrids as the anode and activated carbon as the cathode. The 3 V Li-ion ASC with a LiPF6-based organic electrolyte achieved an energy density of 45.1 Wh·kg^-1 at 715.2 W·kg^-1. The working potential could be further enhanced to 4 V when a polymer ionogel separator (PVDF-HFP/LiTFSI/EMIMBF4) and formulated ionic liquid electrolyte were employed. Such a quasi-solid state ASC could operate at 60℃ and delivered a maximum energy density of 70 Wh·kg^-1 at 1 kW·kg^-1. 展开更多
关键词 solid-state supercapacitor nanohybrid electrode ionogel polymer electrolyte electrochemicalperformance
原文传递
氧化石墨烯(GO)及复合物制备及其对汞吸附特性的研究 被引量:2
14
作者 田冲 Yuxi Liu +3 位作者 余学海 Hongbo Zeng 赵永椿 张军营 《工程热物理学报》 EI CAS CSCD 北大核心 2017年第9期2018-2024,共7页
以石墨粉(G)为原料,通过化学方法制备了氧化石墨烯(GO)、纳米Fe_3O_4负载石墨烯复合材料(MGO)、纳米Ag颗粒修饰磁性氧化石墨烯(GO-Ag/MGO-Ag)四种吸附材料,对材料进行了表征并考察了氧化石墨烯及其复合物对烟气中汞的吸附作用。研究表... 以石墨粉(G)为原料,通过化学方法制备了氧化石墨烯(GO)、纳米Fe_3O_4负载石墨烯复合材料(MGO)、纳米Ag颗粒修饰磁性氧化石墨烯(GO-Ag/MGO-Ag)四种吸附材料,对材料进行了表征并考察了氧化石墨烯及其复合物对烟气中汞的吸附作用。研究表明四种石墨烯基吸附剂可被成功合成和表征;GO在100-150℃时对Hg^0表现出优异的吸附性能,Ag-NPs修饰GO能有效提升吸附剂对汞的吸附能力,MGO-Ag复合吸附剂对汞的吸附能力最佳;MGOAg在150~200℃时表现出优异的汞吸附能力,在反复循环之后吸附性能几乎不变;以MGO-Ag为代表的可再生磁性石墨烯基复合吸附剂在中低温条件下对Hg^0具有优异的吸附性能,且能有效与飞灰进行分离,具有良好的工业应用前景。 展开更多
关键词 氧化石墨烯 汞吸附 磁性 纳米银颗粒 再生循环
原文传递
Towards high-entropy alloys with high-temperature corrosion resistance and structural stability
15
作者 Meifeng Li Hani Henein +1 位作者 Chungen Zhou Jing Liu 《Journal of Materials Science & Technology》 SCIE EI CAS 2024年第7期133-144,共12页
Complex component alloys(CCAs)consisting of multiple principal elements potentially encompass su-perior mechanical properties and good corrosion resistance.Eutectic high-entropy alloys(EHEAs)stand out from CCAs as the... Complex component alloys(CCAs)consisting of multiple principal elements potentially encompass su-perior mechanical properties and good corrosion resistance.Eutectic high-entropy alloys(EHEAs)stand out from CCAs as the desired candidates for high-temperature(HT)applications due to the combined advantages of HEA alloys and unique equilibrium eutectic structure.This work first explores the ther-modynamic calculation route toward HEAs with eutectic structure.Series of pseudo-binary diagrams of transition metal(TM)CCAs were calculated with the Calphad approach to locate the potential eutectic points.The representatives of a CrFeCoNi_(2.2)Al alloy with eutectic structure and a non-eutectic CrFeCoNiCu alloy were cast,and their HT performance was further evaluated by hot corrosion with Na_(2)SO_(4)+25 wt%NaCl molten salts at 700,800 and 900℃,respectively.The HT degradation mechanism was explicitly revealed from a comprehensive thermodynamic perspective.Relationships between the HT performance and the inherent physicochemical properties of the constituent phases and the alloying components were addressed for the first time.It was found that the mixing enthalpy(△H_(mix))and valance electron concen-tration(VEC)played more decisive roles in the hot corrosion resistance than the mixing entropy(△S_(mix))of CCAs.A strategy for tailoring and developing HEAs for HT application by modulating alloy chemistry and microstructural features was proposed. 展开更多
关键词 CCAs HEAs EHEAs Hot corrosion Phase stability Calphad
原文传递
上一页 1 下一页 到第
使用帮助 返回顶部