单一稀土金属钆纳米线阵列的制备及磁性测定

在低温熔融盐体系中,以自制的孔径为80～100 nm的AAO为模板,采用直流电沉积成功地制备了单一稀土金属钆纳米线阵列。经过SEM观测,金属钆纳米线排列有序,尺寸一致;用1 mol.dm-3的NaOH将模板溶掉后并进行TEM检测,钆钴合金纳米线直径约为100 nm,与模板孔径直径基本吻合。EDS测定表明金属钆含量为97.08%,钆纳米线有部分被氧化;XRD分析图谱显示所得到的金属钆纳米线为非晶态。对金属钆纳米线进行磁性能测定,最大磁能积为759.6 kJ.m-3,大于磁性金属Co,说明金属钆具有强磁性。     

碱性介质中钯镍合金纳米线阵列电极对乙醇的电催化氧化

本文研究了一种简单、可控的方法制备直立金属纳米线阵列。采用恒电位法在多孔阳极氧化铝(AAO)模板中电沉积了钯镍(PdNi)合金纳米线阵列。高分辨扫描电子显微镜(HRSEM)图证明模板孔洞的填充率非常高,纳米线阵列的直径和模板的孔径一致,分布较均匀,纳米线的直径平均为60 nm。运用循环伏安法和计时电流法研究了钯镍纳米线阵列电极在碱性溶液中对乙醇的电催化氧化行为。结果表明,相比裸玻碳电极及PdNi膜电极,PdNi纳米线阵列电极在碱性溶液中对乙醇氧化具有更高的电催化活性,峰电流密度可达到32 mA·cm-2。研究了PdNi纳米线阵列电极对不同乙醇浓度的电催化氧化的影响。结果表明,乙醇的浓度从0.01 mol·L-1增加到2.00 mol·L-1,峰电流密度随乙醇的浓度增加而逐渐增大,峰电流密度与乙醇浓度存在一定的线性关系。     

径迹刻蚀模板法制备铜纳米线

用径迹刻蚀的聚碳酸酯为模板,采用电化学沉积法制备了铜纳米线,通过选用不同孔径的模板,得到了铜纳米线阵列,其直径和长度分别取决于聚碳酸酯模板孔洞的直径和厚度.利用扫描电子显微镜(SEM)、X射线衍射(XRD)、透射电子显微镜(TEM)等手段对铜纳米线的形貌、晶体结构特征和成分进行了表征.铜纳米线为多晶结构,大部分成分为铜,少部分为氧化铜.添加(NH4)2SO420 gL-1和二乙基三胺(DETA)80 mLL-1能减小铜晶粒尺寸.     

模板法电化学共沉积Ni-Mo合金纳米线的研究

使用多孔阳极氧化铝模板, 电沉积制备了Ni-Mo合金纳米线. 用扫描电镜（SEM）和表面能谱（XPS）表征沉积物形貌和组成, 用伏安法研究了Ni-Mo合金纳米线的沉积条件及催化性能. 结果表明, Ni-Mo合金纳米线的直径在20～30 nm之间. Ni-Mo共沉积的伏安图上在-1.4 V（vs Ag/AgCl）左右出现一个扩散电流平台. 光电子能谱（XPS）表明, Ni-Mo合金纳米线的共沉积电位出现在-1.4 V以后, 大于这个电位钼以低价氧化物存在. Mo-Ni离子浓度比大于2时扩散电流平台消失. 柠檬酸盐浓度达到2～3倍镍盐浓度时, 扩散电流平台趋于稳定. 在较优条件下电沉积的Ni-Mo合金纳米线显示较高的析氢催化活性.     

模板电沉积法制备一维金亚微米棒、纳米线阵列的研究

通过采用不同类型的无机多孔膜作为模板以及恒电位模板电沉积法在一层厚度为300nm的碳膜上制备出一维金亚微米棒、纳米线及其阵列,并利用扫描电镜（SEM）、透射电镜（TEM）、X射线衍射（XRD）、能量分散谱（EDS）表征了该一维金亚微米棒、纳米线阵列的化学组成、结构和形貌。研究结果表明,采用多孔三氧化二铝膜作为模板,可以得到长度为5μm的一维金亚微米棒（直径200nm）阵列;采用无机复合介孔膜为模板,则得到一维金纳米线（3～4nm）阵列,并通过控制沉积时间,可以调节纳米线的长度（400nm～3μm）。     

电感耦合等离子体原子发射光谱法测定镨钕钆合金中镨钕钆配分量

镨钕钆金属是钕铁硼合金的新兴原料,具有有害元素含量低、产品成分稳定、成本低的优势,而快速准确地测定镨钕钆合金中镨、钕、钆配分量对产品的质量控制具有重要意义。实验采用硝酸溶解样品,在仪器的最佳分析条件下,选择Pr 418.948nm、Nd 445.156nm、Gd 342.246nm为分析谱线,使用电感耦合等离子体原子发射光谱法(ICP-AES)对镨钕钆合金中镨、钕、钆配分量进行测定。讨论了溶解样品条件、共存元素干扰等对测定的影响。结果表明,硝酸易于溶解镨钕钆金属夹杂碳化物和氮化物。样品中共存稀土元素和铁、钙、镁、铝、硅、钼、钨等非稀土元素对镨、钕、钆配分量测定的影响可以忽略。实验方法用于测定3个镨钕钆合金中镨、钕、钆配分量,结果的相对标准偏差(RSD,n=11)为0.070%~0.56%;分别按照实验方法与X射线荧光光谱法(XRF)测定镨钕钆内控标样中镨、钕、钆配分量,两种方法的测定结果一致。     

AAO模板法组装Ni亚微米阵列

为了制备结构规整、长度可控的金属Ni亚微米阵列,以多孔阳极氧化铝(AAO)为模板,采用直流电沉积法进行了Ni亚微米阵列的制备研究,并利用SEM,TEM,XRD等测试手段对其微观形貌和结构进行了表征。结果表明:此法制得的Ni亚微米阵列结构规整、直径与模板孔径基本一致,约为250 nm,是结构紧密的多晶体。并通过控制电沉积的时间,制备出不同长度的Ni纳米线,讨论了电沉积时间对纳米线长度的影响。     

钴(Ⅱ)—咪唑—间溴偶氮羧三元络合物显色反应的研究和应用

确定了钴(Ⅱ)一咪唑—间溴偶氮羧三元络合物形成的最佳条件。在pH1.0的NaAc—HCl介质中,钴与试剂生成紫蓝色三元络合物,Co(Ⅱ)∶咪唑∶间澳偶氮羧=2∶2∶3,Δλ=120nm,摩尔吸光系数为3.4×10~4,双波长法为5.4×10~4,0～15μgCo/25ml符合比尔定律。常温下放置一个月,吸光度不变。可测定某些合金和矿石中微量钴。     

多孔阳极氧化铝模板法制备金属钌纳米线阵列

为了制备金属钌纳米线阵列结构,以多孔阳极氧化铝(AAO)为模板,采用直流电沉积的方法组装贵金属Ru纳米线阵列,并利用SEM,TEM对其微观形貌和结构进行了表征.结果表明:通过此法可以制得排列规整的Ru纳米线阵列,纳米线直径约为250 m,与AAO模板实测孔径一致;并通过控制电沉积的时间,制备出不同长度的Ru纳米线,分析了电沉积时间对纳米线长度的影响.     

金属镍催化钨纳米线的制备及其生长机理

以WO3为原料,金属镍为催化剂,在850℃下于石英基底上成功地合成出大量钨纳米线.采用场发射扫描电子显微镜(FE-SEM)、透射电子显微镜(TEM)、X射线衍射仪(XRD)和能谱分析仪(EDS)对产物的形貌、物相、结构及元素组成等进行测定与分析,并探讨纳米线的生长机理.研究表明:合成的钨纳米线直径介于40～120 nm之间,长度为1～15 tm,沿〈110〉方向生长,具有单晶体心立方(BCC)结构;在其生长过程中,金属镍起到顶端催化作用.     

Chinalco Signed Framework Agreement for Strategic Cooperation with Harbin Municipal Government

正Last month,Chinalco signed framework agreement for strategic cooperation with Harbin Municipal Government in Harbin Xiong Weiping,Chairman of Chinalco,said that based on the strategic deployment to build world top-class mining company with the highest growth potential,Chinalco was now concentrating all efforts on making strategic transition and structural adjustment,strategic cooperation with the local governments where     

Jiangxi Promotes Jiangxi Copper Corporation To Become The World's Most Competitive Mining Company

<正>According to the latest info from Jiangxi Province State-owned Assets Supervision and Administration Commission,Jiangxi Copper Corporation was approved to become the first pilot enterprise for deepening reform.Contents of the pilot work is"Three Self"(self expansion,self decision-making,self     

Journal of Rare Earths Contents List of Vol.32(2014)

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Contributions to Baosteel Technical Research wanted

正Baosteel Technical Research,a quarterly journal,which is issued domestically and abroad,is run and sponsored by Baosteel Group Corporation.Baosteel Technical Research mainly reports the achievements in technological innovation,academic research,new product development and industrial equipment improvement by Baosteel.It will continue to follow up on hot topics and serve the company’s technological development and progress.Its readers include experts in     

Ministry of Industry and Information Technology: No Short Term Solution For Our Country’s Excess Nonferrous Metal Smelting Capacity

【正】According to the Ministry of Industry and Information Technology,the Ministry has released the 2013 Operation Report on China’s Industrial Communication Indu...     

Chinalco Signed Framework Agreement for Strategic Cooperation with Gansu Province

正Recently,Chinalco and Gansu Provincial People’s Government signed"Framework Agreement for Strategic Cooperation on Reform,Restructuring and Transition Development of Chinalco’s Electrolytic Aluminum Enterprises in Gansu",signifying that the strategic cooperation between Chinalco and Gansu Province had made new substantive progress.     

Unavoidable Economic Cycle:30% Of Nonferrous Metal Companies Were Involved In Restructuring

正Owing to continual downturn in real estate and bulk commodity markets,a number of traditional industries in China suffered unfavorable impact in performance.With the progressive disclosure of third quarter report,the no-pleasant-surprise performance of     

Baotou Rare Earth Became the World's Biggest High Performance Magnetic Material Base

正The High Performance Magnetic Material Phase II Project,an industry upgrading project implemented by Inner Mongolia Baotou IronSteel Rare Earth(Group)Hi-tech Co.,Ltd,recently basically finished equipment commissioning,signifying that the enterprise had developed the production capacity of15000 t/a Nd-Fe-B strip casting alloy and 5000t/a Nd-Fe-B magnet,thus becoming the world’s     

Introducing Two Central Enterprises to Integrate Rare Earth Industry,Shandong Rare Earth Group Breaks Surface

正With the signing of"Letter of intention for Propelling Integration of Shandong Rare Earth Enterprises"between Shandong Province Commission Of Economy and Informatization,China IronSteel Research Institute Group("China Steel Institute"),and China Rare MetalsRare Earth Co.,Ltd("China Rare Earth"),the"Shandong Rare Earth Group"jointly set up by the 3 units thus broke surface.On August 9,reporters of the China Economic Herald learned from Shandong Province     

Aluminium Production by Province or City in 2014

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