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不锈钢的纳米化工艺及其耐腐蚀性
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作者 郑志军 高岩 《特殊钢》 北大核心 2008年第2期37-40,共4页
叙述了不锈钢表面纳米化技术-表面机械研磨处理,喷丸法,异步轧制法和激光表面融熔法和不锈钢块体纳米化技术-机械合金法,惰性气体凝聚原位加压法,电化学沉积法,非晶晶化法和大塑性变形法。纳米化不锈钢的耐蚀性能直接受到纳米晶结构的影... 叙述了不锈钢表面纳米化技术-表面机械研磨处理,喷丸法,异步轧制法和激光表面融熔法和不锈钢块体纳米化技术-机械合金法,惰性气体凝聚原位加压法,电化学沉积法,非晶晶化法和大塑性变形法。纳米化不锈钢的耐蚀性能直接受到纳米晶结构的影响,结构均匀,无位错,无应力是获得优异耐蚀性的前提。 展开更多
关键词 不锈钢 纳米化工艺 耐蚀性
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大断面高碳铬轴承钢的微观组织设计与制备工艺研究 被引量:1
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作者 王视祺 王尊呈 周金华 《沈阳工程学院学报(自然科学版)》 2023年第4期90-96,共7页
高碳铬轴承钢含有较高的碳元素,很容易析出粗大且不均匀分布的渗碳体组织,严重影响了钢的塑性。对于传统的中厚尺寸轴承钢,通常使用控轧控冷工艺和球化退火工艺来降低渗碳体的尺寸,但对于大断面轴承钢,这两种工艺很难渗碳到钢的心部,对... 高碳铬轴承钢含有较高的碳元素,很容易析出粗大且不均匀分布的渗碳体组织,严重影响了钢的塑性。对于传统的中厚尺寸轴承钢,通常使用控轧控冷工艺和球化退火工艺来降低渗碳体的尺寸,但对于大断面轴承钢,这两种工艺很难渗碳到钢的心部,对提升钢的塑性不明显。因此,为了提高大断面轴承钢的塑性,从微观组织和强化机理出发,对微合金元素添加工艺和梯度纳米化工艺进行了研究,分析了未来的研发重点。 展开更多
关键词 高碳铬轴承钢 渗碳体 微合金强工艺 梯度纳米化工艺 机理
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纳米炉甘石的制备 被引量:5
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作者 皮振邦 田熙科 +3 位作者 杨超 王传金 杨立军 张素新 《武汉大学学报(理学版)》 CAS CSCD 北大核心 2002年第6期649-651,共3页
介绍了一种采用微波及添加化学分散助剂制备纳米炉甘石粉体的方法 SEM结果表明炉甘石粉体达到纳米级 ,分布为 5 0~ 10 0nm
关键词 纳米炉甘石粉体 制备方法 微波 学分散助剂 外用药 纳米化工艺 碳酸锌
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Electroless Plating of Carbon Nanotubes with Copper 被引量:1
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作者 凤仪 袁海龙 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2004年第5期728-731,共4页
A simple chemical method was employed to coat carbon nanotubes with a layer of copper. Due to the hydrophobic nature, large surface curvature, small diameter and large aspect ratio, it is difficult to gain continuous ... A simple chemical method was employed to coat carbon nanotubes with a layer of copper. Due to the hydrophobic nature, large surface curvature, small diameter and large aspect ratio, it is difficult to gain continuous electroless plating layer on the surface of carbon nanotubes. In this paper, a series methods (oxidization, sensitization and activation) are used to add active sites before electroless plating, and the adjustment of the traditional composition of copper electroless plating bath and operating condition can decelerate electroless plating rate. The samples before and after coating were analyzed using transmission electron microscopy and energy-dispersive X-ray spectroscopy. The results showed that the surface of carbon nanotubes was successfully coated with continuous layer of copper, which lays a good foundation for applying carbon nanotubes in composites. 展开更多
关键词 carbon nanotube electroless plating COPPER
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Photo oxidation of DBT using carbon nanotube titania composite as visible light active photo catalyst 被引量:1
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作者 BARMALA Molood BEHNOOD Mohammad OMIDKHAH Mohammad Reza 《Journal of Central South University》 SCIE EI CAS CSCD 2018年第7期1642-1650,共9页
Sulfur removal from liquid fuels has increased in importance in recent years. Although hydrodesulfurization is the usual method for removing sulfur, the elimination of thiophene compounds using this process is difficu... Sulfur removal from liquid fuels has increased in importance in recent years. Although hydrodesulfurization is the usual method for removing sulfur, the elimination of thiophene compounds using this process is difficult. Photocatalysis is an alternative method being developed for thiophene removal at ambient conditions. Among semiconductors, titania has shown good potential as a photo-catalyst; however, quick recombination of electron holes hinders its commercial use. One way to decrease the recombination rate is to combine carbon nanotubes with a semiconductor. In this work, multiwall carbon nanotube (MWCNT) / titania composites were prepared with different mass ratios of MWCNT to titania using tetraethyl orthotitanate (TEOT) and titanium tetra isopropoxide (TTIP) as precursors of titania. Dibenzothiophene (DBT) photocatalytic removal from n-hexane was measured in both the presence and absence of oxygen. The results indicated that the best removal occurred when the MWCNT to titania ratio was 1. When the ratio exceeded this number, DBT removal efficiency decreased due to light scattering. Also, the composites prepared by TEOT exhibited better efficiency in DBT removal. The research findings suggested that the obtained composite was a visible light active photocatalyst and exhibited better performance in the presence of oxygen. Kinetics of photocatalytic DBT removal was a first-order reaction with removal rate constant 0.7 h–1 obtained at optimum conditions. 展开更多
关键词 advanced oxidation processes carbon nanotube PHOTOCATALYSIS UV KINETICS SEMICONDUCTOR sol-gel process
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Tribological properties of nano-porous anodic aluminum oxide template 被引量:1
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作者 胡宁宁 葛世荣 方亮 《Journal of Central South University》 SCIE EI CAS 2011年第4期1004-1008,共5页
A highly ordered porous alumina template with pores of 45 nm in diameter was synthesized by a two-step electrochemical anodizing process. The influence of pore-enlargement treatment on the porous structure and tribolo... A highly ordered porous alumina template with pores of 45 nm in diameter was synthesized by a two-step electrochemical anodizing process. The influence of pore-enlargement treatment on the porous structure and tribological properties of the film was investigated, and ultrasonic impregnation technology was applied on it to form self-lubricating surface. The structure of the self-lubricating film and its tribological properties were investigated in detail. It can be concluded that the optimum time of pore-enlargement treatment is 20 min. The diameter of the pores and the surface porosity of the film are about 70 nm and 30%, respectively, while the film maintains the property of its high hardness. Under the same friction condition, the frictional coefficient of the self-lubricating film is 0. 18, much lower than that of the anodic aluminum oxide template, which is 0.52. In comparison with the lubricating surface of non-porous dense anodic aluminum oxide template, the lubricating surface fabricated by the ultrasonic impregnation method on the porous anodic aluminum oxide template keeps longer period with low friction coefficient. SEM examination shows that some C60 particles have been embedded in ultrasonic impregnation technology. the nanoholes of the anodic aluminum oxide template by the 展开更多
关键词 anodization SELF-LUBRICATING ultrasonic impregnation C60 pore-enlargement
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Preparation and Properties of a New Type of Poly(butylene-terephthalate)with Layered Silicate Nanocomposites 被引量:1
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作者 柯扬船 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2003年第6期701-708,共8页
In this paper, poly(butylene-terephthalate)-layered silicate of clay nanocomposites (NPBT) are reported. Their thermal properties, heat distortion temperature (HDT) and crystallization nucleation are investigated. NPB... In this paper, poly(butylene-terephthalate)-layered silicate of clay nanocomposites (NPBT) are reported. Their thermal properties, heat distortion temperature (HDT) and crystallization nucleation are investigated. NPBT samples have apparent viscosity over 0.85, HDT of 30℃ to 50℃ higher than that of poly (butylene-terephthalate) (PBT) for clay load from 1.0% to 10.0% (by mass), and higher capability to accommodate clay than other polymers. The nonisothermal crystallization experiments indicate that the better thermal degradation behavior and crystallization rate of NPBT are 50% higher than PBT, and its injection mould processing temperature is lowered from 110℃ to 55℃. NPBT samples are characterized by several techniques. X-ray shows an original clay interlayer distance enlarged from 1.0 nm to 2.5 nm, while both TBM and AFM indicate an average size from 30nm to lOOnm of exfoliated clay layers, and 3%(by mass) of particle agglomeration being phase separated from PBT matrix, which are factors on some mechanical properties decrease of NPBT. The disappearance of spherulitic morphology in NPBT resulted from layers nucleation is detected. Improving NPBT properties by treating clay with long chain organic reagent and controlling the way to load it is suggested. 展开更多
关键词 poly(butylene-terephthalate)-layered silicate of clay nanocomposites crystallization nucleation thermal properties phase separation
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Al_2O_3-2SiO_2 Nanoparticles with Defined Al-Si Ratio:Processing Optimization and Conversion
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作者 郑广俭 崔学民 +2 位作者 张伟鹏 童张法 李峰 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2012年第2期312-318,共7页
Attempts had been made to synthesize Al2O3-2SiO2 nanopowders by sol-gel method with tetraethoxysilane(TEOS) and aluminum nitrate(ANN) as the starting materials.DTS,TEM,SEM and BET were employed to study the effect... Attempts had been made to synthesize Al2O3-2SiO2 nanopowders by sol-gel method with tetraethoxysilane(TEOS) and aluminum nitrate(ANN) as the starting materials.DTS,TEM,SEM and BET were employed to study the effects of process parameters on the size,specific surface area and structure(morphology) of powders.The alkali-activation reactivity of the powders was tested for manufacturing geopolymers and their hydrothermal reactions were performed for fabricating zeolites.The results show that the optimum process parameters and drying method for preparing Al2O3-2SiO2 nanopowders are as follows:the molar ratio of water and ethanol to TEOS are 0:1 and 12:1 respectively at synthetic temperature of 50 ℃ and the drying method is azeotropic distillation with microwave drying.The average particle diameters of the powders were about 70 nm and the largest BET specific surface area was up to 669 m^2·g^-1.The compressive strength of the geopolymer and the calcium exchange capacity(by CaCO3) of NaA zeolite prepared with the powders reached to 29 MPa and 366 m^2·g^-1 respectively. 展开更多
关键词 parameter optimization Al2O3-2SiO2 nanopowder SOL-GEL GEOPOLYMER ZEOLITE
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PREPARATION OF POLYSULFONAMIDE/TiO_2 NANOCOMPOSITES BY SOL-GEL
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作者 WANG Xiaopeng WANG Weitao +2 位作者 MA Ji DENG Jie LIU Li 《Chinese Journal of Reactive Polymers》 2006年第1期60-62,共3页
Polysulfonamide(PSA)was synthesized at room temperature,the polymerization based on terephthaloyl chloride and 3,3’-diaminodiphenylsulfone in the common solvent N,N-Dimethyl-acetamide(DMAc).Polysulfonamide/titanium o... Polysulfonamide(PSA)was synthesized at room temperature,the polymerization based on terephthaloyl chloride and 3,3’-diaminodiphenylsulfone in the common solvent N,N-Dimethyl-acetamide(DMAc).Polysulfonamide/titanium oxide nanocomposites were prepared by sol-gel method.Tetrabutyl titanate(TBT)was added into the polysulfonamide solution,at the same time,some water was mixed to make the TBT hydrolyze.In the process,hydrochloric acid was used to catalyze the reaction.The polysulfonamide chemistry structure was characterized by FT-IR spectrum.Atomic force microscopy(AFM)was employed to observe the microstructure of the composite film.The thermal property was investigated by TGA.The results show that we have succeeded to synthesize the polysulfonamide,TiO2 particles were well distributed in the composite film and average size was about 20 nm on average,the heat-resistance of nanocomposite was batter than the pure polysulfonamide. 展开更多
关键词 POLYSULFONAMIDE TIO2 Sol-Gel process Nanocomposite.
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锂离子电池用硅基负极硅源材料及其制备研究进展 被引量:1
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作者 龚俊 宋鹏 +3 位作者 刘星汉 唐延洪 谭凯文 李业军 《复合材料学报》 EI CAS CSCD 北大核心 2024年第7期3503-3514,共12页
近年来,新能源汽车的飞速发展对电池的性能提出了更高要求,而传统石墨类负极材料的比容量较低,难以满足发展的需求。硅具有极高的理论比容量,作为负极材料能有效提高电池性能,具有巨大的发展潜力,而制备硅基负极的硅源材料、硅颗粒的形... 近年来,新能源汽车的飞速发展对电池的性能提出了更高要求,而传统石墨类负极材料的比容量较低,难以满足发展的需求。硅具有极高的理论比容量,作为负极材料能有效提高电池性能,具有巨大的发展潜力,而制备硅基负极的硅源材料、硅颗粒的形貌尺寸及其加工制备工艺对硅基负极性能有着重要影响。本文综述了硅基负极材料的最新研究进展,重点关注硅源材料的选择、硅纳米化工艺、硅基负极材料的制备等,提出了不同硅源和对应制备工艺在硅基负极材料制备过程中存在的问题和挑战,为锂离子硅基负极的发展提供重要的参考。 展开更多
关键词 负极材料 纳米化工艺 锂离子电池 学性能
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The Efficiency of Application Nanosilver in Technological Processes of Making Red Wine
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作者 Ebelashvili Nana Shubladze Liana +1 位作者 Salia Elene Gagelidze Nino 《Journal of Food Science and Engineering》 2013年第8期424-429,共6页
The efficiency of using nanostructured silver in technological processes of making red wine has been studied with the purpose of substituting sulfur dioxide. For preparation of research objects, we used dry wine mater... The efficiency of using nanostructured silver in technological processes of making red wine has been studied with the purpose of substituting sulfur dioxide. For preparation of research objects, we used dry wine material of red grape variety "Saperavi". After completion of malolactic fermentation, the second racking the wine material off the lees and its treatment with antiseptics were carried out. Sulfur dioxide (Kadifit) and different doses of nanostructured silver were used. Microbiological investigation was performed on the presence of lactic bacteria after completion of malolactic fermentation and racking off the lees. The investigation of phenolic compounds was conducted at the following stages of technological processes: (1) after completion of alcoholic fermentation and racking off the lees; (2) after completion of malolactic fermentation; (3) after the second racking off the lees and treatment with antiseptics. By means of the HPLC analysis, the amounts ofcatechins, phenolcarbonic acids and flavonols were determined. It has been established that after conduction of malolactic fermentation in the process of racking the wine material off the lees and storage, the application of 0.6 mg/L of nano-silver for blocking of lactic-acid bacteria and inhibition of oxidation of phenolic compounds has the same effect as sulfitization with 50 mg/L of Kadifit. 展开更多
关键词 NANO-SILVER red wine malolactic fermentation phenolic compounds sulfur dioxide
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Optimization of the preparation process of nano TiO2 with sol-gel method at low temperature
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作者 ZHU Tang-long WANG Li-ming SHEN Yong XU Ling-hui SHEN Yang-yang 《International English Education Research》 2015年第5期1-5,共5页
In this paper, preparation process of nano TiO2 with sol-gel method at low temperature was optimized by response surface method. The nano TiO2 was analysised by DRS and XRD. Result show that: 20mL tetrabutyl titanate... In this paper, preparation process of nano TiO2 with sol-gel method at low temperature was optimized by response surface method. The nano TiO2 was analysised by DRS and XRD. Result show that: 20mL tetrabutyl titanate, 10mL acetic acid, 6mL ethanol dosage, aging time was 29h, aging temperature was 36℃, Nano TiO2 was prepared under the condition. Particle size of nano particles was 37.3nm, Photodegradation rate was 90.2%. It had good photocatalytic ability. 展开更多
关键词 The response surface Aging time Aging temperature Dosage of ethanol
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Novel fabrication of copper nanowire/cuprous oxidebased semiconductor-liquid junction solar cells 被引量:6
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作者 Haitao Zhai Ranran Wang Weiqi Wang Xiao Wang Yin Cheng Liangjing Shi Yangqiao Liu Jing Sun 《Nano Research》 SCIE EI CAS CSCD 2015年第10期3205-3215,共11页
A Cu nanowire (NW)/cuprous oxide (Cu2O)-based semiconductor-liquid junction solar cell with a greatly enhanced efficiency and reduced cost was assembled. The Cu NWs function as a transparent electrode as well as p... A Cu nanowire (NW)/cuprous oxide (Cu2O)-based semiconductor-liquid junction solar cell with a greatly enhanced efficiency and reduced cost was assembled. The Cu NWs function as a transparent electrode as well as part of the Cu NWs/ Cu2O coaxial structures, which remarkably benefit the charge separation. The best solar cell reached a conversion efficiency as high as 1.92% under a simulated AM1.5G illumination, which is 106 times higher than that of cells based on fluorine-doped tin oxide and Cu2O. 展开更多
关键词 Cu nanowires semiconductor-liquidjunction solar cells transparent electrodes cuprous oxide
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