油酸改性纳米ZrO2粉体及其机制研究

采用水热法制备了平均粒径小于10nm左右的氧化锫.用油酸对纳米ZrO2粉体进行了表面改性,研究了改性工艺条件中油酸添加量对亲油改性效果的影响.按质量百分比油酸:乙醇:水=l:2:2的比例配制改性剂,油酸添加量为ZrO2的lO%(摩尔分数)时,改性的ZrO2粉体在二甲苯中分散稳定性最佳.通过FT-IR分析表明,油酸与纳米ZrO2是以氢键和共价键两种形式结合,在无机纳米粒子表面形成单分子膜.     

纳米SiO_2/Au复合粒子的制备及其性质表征

通过改进的方法制备了金壳包覆二氧化硅纳米复合粒子. 二氧化硅和金纳米粒子分别通过Stober法和化学还原法制备. SEM分析表明, 都呈现出单分散的球状分布, 粒径为300和100 nm左右. 制备的纳米复合粒子通过TEM, UV-Vis-Near-IR, FTIR来表征和研究, 结果表明结合柠檬酸钠与硼氢化钾还原法制备所得到的SiO_2/Au复合粒子表层光滑, 完整, 没有团聚现象. SiO_2/Au-3的光学共振峰比SiO_2/Au-1和SiO_2/Au-2有红移. 傅立叶红外光谱研究表明形成SiO_2/Au核-壳结构后, Si-O-Si和Si-OH的键会明显减弱.     

等离子喷涂纳米ZrO2热障涂层的组织及性能研究

采用大气等离子喷涂技术制备纳米ZrO2热障涂层,采用金相显微镜、X射线衍射仪、拉伸试验机等对涂层组织及性能进行了研究。结果表明,纳米ZrO2热障涂层组织均匀,面层内孔隙较小、呈近圆形,孔隙率为9.6%;涂层由t-ZrO2单相组成,其平均结合强度和平均剪切强度较传统微米ZrO2热障涂层分别提高63.5%和50.5%,分别达到46.63MPa和23.97MPa;同时涂层具有优异的抗腐蚀性能和耐湿热能力,腐蚀和湿热试验后涂层完整、表面清洁,无新相生成。     

等离子喷涂纳米ZrO2热障涂层的耐盐雾腐蚀性能

对大气等离子喷涂技术制备的纳米ZrO2热障涂层进行盐雾试验,采用金相显微镜、X射线衍射仪、拉伸试验机等对试验前后涂层组织及性能进行了研究。结果表明,纳米ZrO2热障涂层具有优异的耐盐雾腐蚀能力,盐雾腐蚀对涂层的显微组织、相结构、结合强度、剪切强度和耐湿热环境能力均无明显影响。盐雾腐蚀前后纳米ZrO2陶瓷面层均由t-ZrO2单相组成,其孔隙率分别为13.1%和12.6%,平均结合强度分别达到47.9MPa和48.7MPa。湿热试验后涂层完整、表面清洁,无新相生成。     

金纳米粒子的催化特性及其应用

金纳米粒子的特殊性质产生于其特殊结构及特殊效应。负载或非负载型Au纳米粒子表现出极高的化学活性和催化性能，使其在化学工业中得到了广泛应用。用沉积或共沉淀方式将Au纳米粒子负载到金属氧化物载体上，在室温催化氧化C0为C02的效率比其它贵金属催化剂高得多；Au／Ti02催化剂在气相中能够高效率地催化氧化丙稀为环氧丙烷，选择性高达90％；Au纳米粒子催化剂在不饱和碳氢化合物的部分氢化反应中表现出良好的选择性：非负载型和负载型Au纳米粒子在液相反应中表现出独特的催化特性;Au/Fe2O和Au/ZrO2等负载型催化剂在低温水气转换制备氢气的反应中催化活性很高，而且载体的结晶度越高，催化活性越高。中对近年来Au纳米粒子的上述催化特性和应用进行评述。     

多孔道磁金复合纳米粒子(Fe_3O_4-Au/pSiO_2)的制备及结构表征

采用分步包覆法制备了具有多核壳结构的磁金复合纳米粒子Fe3O4-Au/pSiO2,所得纳米粒子单分散性好,粒径较均匀,平均粒径为150nm。经过表面保护刻蚀处理后,粒子包覆层呈多孔道结构,平均孔径为7.3nm。由于多孔道包覆层的存在,磁金复合纳米粒子出现了位于536nm处金的表面等离子体共振峰,表明其具有一定的光通透性。与未刻蚀纳米粒子相比,刻蚀后的多孔道纳米粒子的饱和磁化强度提高了13.3emu/g,达到49.6emu/g。     

碳吸附沉淀法制备氧化钇稳定氧化锆纳米粉末研究

针对纳米粉末制备过程中团聚问题,研究了碳吸附对氨水沉淀法制备的纳米ZrO2(Y2O3)粉末的物相、粒径、比表面积、前驱体热分解特性以及碳黑的加入量对粉末比表面积的影响.结果表明,采用碳吸附沉淀法可以减少在高温条件下ZrO2晶粒增大,制得粒径小、团聚强度低的氧化钇稳定四方氧化锆纳米粉末.经700℃焙烧后制得分散性好的四方相ZrO2纳米粉末,比表面积为101.2m2/g , 平均粒径为8nm.     

改性MoS_2/双马来酰亚胺树脂的制备及性能研究

为解决传统商业MoS_2纳米粒子在有机树脂基体中容易团聚的问题,利用硅烷偶联剂KH-560对其进行改性,并将改性后的MoS2纳米粒子加入到双马来酰亚胺树脂(BMI)基体中,制备出改性MoS_2/BMI树脂复合材料。研究了改性MoS_2纳米粒子含量对改性MoS_2/BMI树脂复合材料力学性能、摩擦学性能的影响。结果表明:改性MoS_2纳米粒子较商用MoS_2纳米粒子有较为良好的分散性能;当改性MoS_2纳米粒子含量为4. 0%(质量分数)时,MoS_2/BMI树脂复合材料的综合性能最优。     

油田管道用纳米TiO2改性防腐涂料的研究

制备了TiO2:改性防腐涂料,并对其性能进行了实验研究.结果表明,当纳米粒子添加量为3%时,防腐材料的常规性能、耐磨擦性及耐腐蚀性都得到了较大的提高.说明纳米TiO2对改善石油管道防腐涂料的性能具有重要作用.     

金红石型纳米TiO2在HIPS塑料中的抗老化应用研究

采用金红石型纳米TiO2改性HIPS塑料,SEM及FTIR分析表明,通过表面改性可将低分子有机物接枝到纳米TiO2表面,并提高了无机纳米粒子在HIPS树脂中的相容性和分散性.金红石型纳米TiO2复合改性HIPS经过28d的氙灯气候加速老化后,其力学性能在较长时间内得到保持,抗色变能力大幅度提高,分子链断裂得到有效抑制.FTIR分析老化机理表明,由于纳米TiO2与光稳定剂的协同作用使改性HIPS的光老化速度得到有效抑制,其羰基和羟基吸收峰的振动特征在28 d的老化期间内均未发生明显变化.     

China's Major Non-ferrous Metals Imports & Exports

正~~     

Zinc Production by Province in 2014

正~~     

80% of Chinese Firms Purchasing Overseas Mines Ended up in the Red

<正>Minmetals Resources acquired the world’s largest copper mine under construction for USD5.85 billion.One after another,listed companies Jien Nickle,China Molybdenum and Chihong Zinc and Germanium raised money to get involved in overseas mining projects…SOEs and private enterprises are engaged in a frenzy of overseas mine purchasing.A reporter with Economic     

Copper Processing Profit Dropped Sharply,Copper Consumption Will Face Impact in the Second Half of the Year

正Judging from China’s copper consumption field,the biggest consumption unit is electric power,which accounts for 47%of total consumption;it is followed by light industry sector,including household electrical appliance,machinery,durable goods and hardware etc,which accounts for 22%of total consumption;followed by transportation field,     

Central Geological Prospecting Fund Newly Added 16.47 Million Tonnes of Bauxite in 2013

正In 2013,the Central Geological Prospecting Fund(CGPF)Project newly discovered 15 ore fields,including 3 large above ore fields,and 5medium sized ore fields.The reporter learned from the recently published"Annual Report of Central Geological Prospecting Fund Project(2013)"that,from 2006 to 2013 the CGPF     

Manufacturers of Copper Tube for Central Air Conditioner Use Face Mounting Pressure in the Final Quarter of the Year

正This year,the investment growth rate of real estate industry continued to slow down,sold area of commercial housing also dropped significantly,which brought huge pressure to the domestic air conditioning manufactures.In the first half of the year,by relying on high growth in national financial expenditure,along with investment in public infrastructure     

Xinjiang Ranks No.1 in Production of Primary Aluminum in China

正Kang Yi,Honorary Chairman of China Nonferrous Metals Industry Association,said recently at the Forum on Development of the Non-ferrous Metals Industry in Central and Western China held in Zhengzhou that,as more and more electrolytic aluminum factories in Xinjiang came into operation,the electrolytic aluminum output of Xinjiang had reached2,275,000 tons in the first 7 months this year,     

Shenhuo Coal Industry and Electricity Power Completed800,000 t/a Aluminum Project in Xinjiang

正"Xinjiang project has been completed according to schedule,but total completion and total start of production are two different concepts,after completion it still needs a gradual process of reaching production target."On the morning of November 3,Shenhuo Coal Industry and Electricity Power told investors the above statement on the investor interaction platform.     

Guangdong Metal Transaction Center has Become the Second Largest Precious Metal Transaction Platform Nationwide

正The reporter learned from Guangdong Province Precious Metal Transaction Center that in 2013the Center maintained healthy development momentum,and had become the second largest precious metal transaction platform in China in terms of market size;currently Guangdong is quickening steps of financial innovation for the Center,aiming to build a transaction center with international core competitiveness.     

Seven Rare Earth Projects Involving Close to 3 Billion Yuan Investment Landed In the HighTech Zone

正On May 22,Baotou Rare Earth Industry Cooperation Consultation MeetingProject Agreement-signing Ceremony was held in Ningbo,nearly 40 enterprises from Ningbo,Guangdong,Hunan,and Shanxi participated in project consultation.After multi-lateral communication,agreements were signed for a total of 7 rare earth projects successfully.