共查询到18条相似文献,搜索用时 78 毫秒
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在草酸溶液中以二次阳极氧化法制备了阳极氧化铝(anodic aluminium oxide,AAO)模板;采用减压抽滤法,在AAO模板的纳米孔中使Gd(NO3)3·6H2O,CoSO4·7H2O溶液与NaOH溶液反应并经高温分解,制备出GdCoxOy纳米管。通过扫描电镜、透射电镜、选区电子衍射、X射线衍射和能量色散谱表征了GdCoxOy纳米管形貌、结构、元素组成和含量;用振动样品磁强计测量了纳米管的磁性能。结果表明:制备的GdCoxOy纳米管为非晶态结构;Gd,Co和O元素的摩尔比为14.86:4.78:80.36;其质量比为59.88:7.18:32.94。室温下GdCoxOy纳米管有明显的磁各向异性,易磁化方向平行于GdCoxOy纳米管阵列的方向。 相似文献
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多孔氧化铝模板法制备取向碳纳米管阵列的研究进展 总被引:3,自引:1,他引:3
利用化学气相沉积技术在多孔氧化铝模板上可以制备取向碳纳米管阵列。通过调节阳极氧化参数可以改变模板的孔结构,进而可控制碳纳米管在孔道中生长的形貌。用这种方法制备的碳纳米管的直径、长度和密度可以选择性控制,这将有利于研究碳纳米管的性质和它在电化学及其他领域的应用。介绍了多孔氧化铝模板的形成原理以及碳纳米管在多孔氧化铝模板上的生长机理,讨论了阳极氧化条件、催化剂和气相沉积温度对碳纳米管特性的影响,并指出了这种技术中一些需深入研究的问题。 相似文献
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Jinshan Tan Xi Lin She Fang Yuan Shujing Yang Di Zhou 《Journal of Porous Materials》2008,15(6):619-623
Acrylonitrile-butadiene-styrene terpolymer (ABS) nanotubes and their arrays with different structures were prepared successfully using nanoporous Anodic Aluminium Oxide
(AAO) template through polymer solution and melt wetting method, a simple physical technique. According to the results of
Scanning Electron Microscopy (SEM) and Transmission Electron Microscopy (TEM), nanotubes can be obtained using either polymer
solution or polymer melt. As for solution wetting method, the integrity of ABS nanotubes depends on the concentration of polymer
solution. The wall of ABS nanotubes made from 2.5 wt% solution has pore defects, while intact nanotubes can be obtained using
5.0 wt% solution. As for melt wetting method, the structure of nanotubes depends on the temperature of the melt. ABS nanotubes
can be prepared at both 240 and 270 °C but the thickness of tubular wall and the length of the nanotubes are different. TGA
tests showed that the thermal decomposition temperature of ABS nanotubes is ca. 100 °C lower than that of bulk ABS polymer. 相似文献
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Xilin She Guojun Song Feng Jiang Shujing Yang Chao Yang Di Zhou 《Journal of Porous Materials》2009,16(3):267-271
Ethylene vinyl acetate (EVA) nanotube arrays were successfully prepared through wetting of anodic alumina oxide (AAO) template
with polymer melt or solution, a simple physical technique. The results of scanning electron microscope (SEM) demonstrate
that the wall thickness of nanotubes via solution wetting method varies from the concentrations of solutions. The EVA nanotubes,
obtained from 5.0 to 7.0 wt% EVA solutions, are ca. 40 nm and ca. 60 nm, respectively. As for melt wetting method, the length
of nanotubes depends on temperature and the flow properties of polymer melt. The mechanism of forming the nanotubes has been
also discussed. 相似文献
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Lan Shen Mubarak Ali Zhengbin Gu Bonggi Min Dongwook Kim Chinho Park 《Korean Journal of Chemical Engineering》2013,30(1):221-227
Anodized aluminum oxide (AAO) nanotemplates were prepared using the Al/Si substrates with an aluminum layer thickness of about 300 nm. A two-step anodization process was used to prepare an ordered porous alumina nanotemplate, and the pores of various sizes and depths were constructed electrochemically through anodic oxidation. The optimum morphological structure for large area application was constructed by adjusting the applied potential, temperature, time, and electrolyte concentration. SEM investigations showed that hexagonal-close-packed alumina nano-pore arrays were nicely constructed on Si substrate, having smooth wall morphologies and well-defined diameters. It is also reported that one dimensional copper nanopillars can be fabricated using the tunable nanopore sized AAO/Si template, by controlling the copper deposition process. 相似文献
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《Carbon》2013
Well-aligned, open-ended carbon nanotubes (CNTs), free of catalyst and other carbon products, were synthesized inside the pores of an anodic aluminium oxide (AO) template without using any metallic catalyst. The CNTs and the CNT/AO composites were characterized by scanning and transmission electron microscopy, thermogravimetric analysis, Raman spectroscopy and X-ray diffraction. Particular care was devoted to the reactor design, synthesis conditions, the catalytic role of the templating alumina surface and the preservation of the alumina structure. The transport properties (sorption, diffusion and permeability) to water vapor were evaluated for both the alumina template and the CNT/AO composite membrane. The measured effective electrical volume conductivity of the CNT/AO composite was found ranging from a few up to 10 kS/m, in line with the recent literature. The estimated averaged values of the CNTs-wall conductivity was around 50 kS/m. 相似文献
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十溴二苯乙烷对ABS阻燃性能分析与展望 总被引:1,自引:0,他引:1
通过十溴二苯乙烷对ABS在活化能、燃烧性能、轰然时间、火灾性能指数、烟及毒气的释放等参数的分析,可知十溴二苯乙烷对ABS具有较好的阻燃效果,但是存在发烟量大的缺点。环保型低烟低卤低毒的复合阻燃剂是将两种或两种以上阻燃剂复配实用,使各成分性能互补,相互增强彼此的作用效果,即产生协同效应,可以达到降低阻燃剂用量,降低阻燃材料成本,提高材料阻燃性能、加工性能及物理机械性能等目的,是阻燃剂发展的必然趋势。 相似文献