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Transactions of Nonferrous Metals Society of China 2020年第8期30卷 2119-2131页

作者： C.AGUILAr E.PIO A.MEDINA C.PArrA r.mangalaraja P.MArTIN I.ALFONSO K.TELLO Departamento de Ingeniería Metalúrgica y de Materiales Departamento de Física(+)Universidad Técnica Federico Santa MaríaValparaísoChile Instituto de Investigación en Metalurgia y Materiales Universidad Michoacana de San Nicolás de HidalgoMoreliaMéxico Laboratorio de Cerámicos Avanzados y Nanotecnologia Departamento de Ingeniería de MaterialesUniversidad de ConcepciónConcepciónChile Instituto de Investigaciones en Materiales Universidad Nacional Autónoma de MéxicoCampus Morelia UNAMMoreliaMéxico

研究Sn含量对Ti-13Ta-xSn(x=3,6,9,12,摩尔分数,%)合金中fcc相形成的影响。合金采用机械合金化方法制备,所用设备为行星式球磨机。通过rietveld分析发现,fcc相的晶粒尺寸小于10 nm,微应变大于10-3,这两个条件是钛基合金中形成fcc相所必... 详细信息

研究Sn含量对Ti-13Ta-xSn(x=3,6,9,12,摩尔分数,%)合金中fcc相形成的影响。合金采用机械合金化方法制备,所用设备为行星式球磨机。通过rietveld分析发现,fcc相的晶粒尺寸小于10 nm,微应变大于10-3,这两个条件是钛基合金中形成fcc相所必需的。对于所有的样品,fcc相的显微组织中均含有小于10 nm的等轴晶。当Sn含量为6%时,钛合金中fcc相的含量最大,因为该合金具有最大的微应变(1.5×10-2)和晶粒尺寸(6.5 nm)。实验数据表明,球磨过程中形成固溶体和非晶相。用扩展Miedema模型对促进固溶体和非晶相形成的必要条件进行热力学计算。结果表明,当Sn含量从3%增加到12%时,形成非晶相所需的能量从大约10 k J/mol变为-5 k J/mol左右。热力学计算结果与XrD分析和HrTEM结果一致。

关键词：钛基合金相变 fcc相 rietveld分析机械合金化

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纳米贵金属插入的粘土用于催化选择性加氢反应(英文)

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催化学报 2010年第10期31卷 1200-1208页

作者： Manikandan DHANAGOPAL DUrAISWAMI Divakar rupa A.VALENTINE mangalaraja rAMALINGA VISWANATHAN Sivakumar THIrIPUrANTHAGAN Catalysis Laboratory Department of Chemical Engineering A.C. College of Technology Anna University Advanced Ceramic and Nanotechnology Laboratory Department of Materials Engineering Faculty of Engineering University of Concepcion Department of Chemical Engineering Faculty of Science and Technology University of Basque Country

The use of clay minerals in the synthesis of nanosized noble metal particles to give increased catalytic activity was investigated. Nanosized platinum and ruthenium catalysts intercalated in clay (montmorillonite/hectorite) were synthesised and their catalytic activity was evaluated for the selective hydrogenation of three different α,β-unsaturated aldehydes, namely, crotonaldehyde, cinnamaldehyde, and citral, in a gas phase microreactor. The metal nano-sol was prepared by the chemical reduction of its precursor by the micellar technique in the presence of cetyl trimethyl ammonium bromide (CTAB), and the micelle stabilized metal particles were intercalated in the clay mineral by ion exchange. TEM micrographs of the catalyst particles showed that the metal particles were in the nanometre range. The average diameters of the particles were 1-25 nm. The effects of temperature, metal loading, and hydrogen flow rate on the catalytic activity and selectivity for α,β- unsaturated alcohol were studied. The results were correlated with the structural properties of the catalysts. The products formed in each reaction over the different catalysts showed that the catalysts were very active for hydrogenation, and the selectivity for the desired product, namely, α,β-unsaturated alcohol, was good. The metal catalysts intercalated in montmorillonite showed better selectivity than that in hectorite because of its higher acidity. Increased selectivity for α,β-unsaturated alcohol was observed with increased flow rate of hydrogen.

关键词： selective hydrogenation nano-particle platinum ruthenium intercalated montmorillonite or hectorite vapor phase reaction

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Growth and Improvement of ZnO Nanostructure Using Aged Solution by Flow Coating Process

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Advances in Materials Physics and Chemistry 2013年第3期3卷 194-200页

作者： Kasimayan Uma Solaiappan Ananthakumar ramalinga Viswanathan mangalaraja Tetsuo Soga Takashi Jimbo Centre for Social Contribution and Collaboration Nagoya Institute of Technology Nagoya Japan Centre for Social Contribution and Collaboration Nagoya Institute of Technology Nagoya Japan Department of Frontier Materials Nagoya Institute of Technology Nagoya Japan Department of Frontier Materials Nagoya Institute of Technology Nagoya Japan Department of Materials Engineering University of Concepcion Concepcion Chile Materials and Minerals Division National Institute for Interdisciplinary Science and Technology (CSIR) Kerala India

ZnO nanostructures were prepared on corning glass substrate by flow coating process with different annealing temperature from 100?C to 600?C. Fresh and two days aged solutions were used to investigate the growth behavior and to evaluate the nanostructure of ZnO. The effect of preparation conditions on the deposition of ZnO nanostructure was investigated by scanning electron microscopy (SEM), X-ray diffraction (XrD), raman, and photoluminescence spectroscopy (PL). The results indicated that the solution aging condition and annealing temperature have a strong influence on the morphology and structural properties of the ZnO nanostructure. The solution aged after two days shows the different morphologies compared with the freshly prepared solution.

关键词： ZnO Nanostructure Flow Coating Photo Luminescence (PL)

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