共查询到20条相似文献,搜索用时 46 毫秒
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选用葡萄糖作为添加剂,高纯铝在10℃,40 V直流电压条件下,利用两步阳极氧化法在0.3 mol/L草酸溶液中加入不同浓度的葡萄糖制备多孔阳极氧化铝模板,并且通过场发射扫描电镜(FESEM)、X射线衍射(XRD)对氧化膜的微观形貌、晶体结构进行表征,从而研究不同浓度的葡萄糖对氧化膜的影响。结果表明:葡萄糖的加入不会改变阳极氧化过程;不同浓度的葡萄糖均能使氧化膜致密,孔径变小,但随着葡萄糖浓度的增加,有序性会遭到破坏,在添加不同葡萄糖浓度时,3 g/L的葡萄糖添加剂会得到孔径更小,一定有序性的氧化铝膜;XRD表明葡萄糖的加入并不会影响氧化铝膜的非晶态结构。 相似文献
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在直流恒电压条件下,以草酸为电解液制备了多孔氧化铝模板。采用扫描电子显微镜对多孔氧化铝模板的形貌进行表征。氧化铝模板的厚度测量表明,当氧化时间为6h时,氧化膜厚度达到最大值35.0mm。根据氧化过程的j-t曲线研究了多孔氧化铝模板的形成过程。 相似文献
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以磷酸溶液为电解液、以高纯铝为阳极,采用两步阳极氧化法制备氧化铝模板。扫描电子显微镜(SEM)对其表面形貌分析表明,氧化铝膜为多孔结构,膜孔径随着阳极氧化电压的增大而不断增大。对阳极氧化电流密度变化分析证实,铝的阳极氧化经历了三个阶段:阻挡层的生成、多孔层的形成和多孔层的稳定生长。以制备的氧化铝膜为阴极、锌片为阳极,以硝酸锌和硼酸的混合液为电解液,采用交流电沉积方法制备了针状氧化锌纳米线。 相似文献
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对铝基材实施阳极氧化处理,可在其表面形成氧化铝多孔膜。当氧化铝多孔膜的纳米孔排列成规则的阵列结构时,氧化铝多孔膜将具有许多其它纳米材料无法比拟的优势。综述了以具有规则纳米孔阵列结构的阳极氧化铝薄膜作为模板,通过复制、沉积、吸附等技术,制备具有各种特殊用途纳米材料的制备工艺,使用这些方法制备的纳米材料已经广泛地应用于催化、气体吸收、分离膜、微电子器件等。 相似文献
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利用基体铝的优良热传导性、表面铝阳极氧化膜具有的大的内表面积及材料的可加工性,可以开发出既具有高的热传导性又具有良好催化特性的薄膜.介绍了多孔铝阳极氧化膜在甲醇分解、环境保护、催化精馏、化学热泵用催化剂等方面的应用研究进展,并对其在催化中的应用前景进行了展望. 相似文献
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Nanostructures have drawn great attentions for functional device applications. Among the various techniques developed for fabricating arrayed nanostructures of functional materials, nanostructuring technique with porous anodic aluminum oxide (AAO) membrane as templates becomes more attractive owing to the superior geometrical characteristics and low-cost preparation process. In this mini review, we summarize our recent progress about functional nanostructuring based on perfectly-ordered AAO membrane to prepare perfectly-ordered nanostructure arrays of functional materials toward constructing high-performance energy conversion and storage devices. By employing the perfectly-ordered AAO membrane as templates, arrayed nanostructures in the form of nanodot, nanorod, nanotube and nanopore have been synthesized over a large area. These as-obtained nanostructure arrays have large specific surface area, high regularity, large-scale implementation, and tunable nanoscale features. All these advanced features enable them to be of great advantage for the performance improvement of energy conversion and storage devices, including photoelectrochemical water splitting cells, supercapacitors, and batteries, etc. 相似文献
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Jingyao Dai Jogender Singh Namiko Yamamoto 《Journal of the American Ceramic Society》2018,101(5):2170-2180
Quasi‐ductile deformation of nanopores was studied by conducting nanoindentation tests on a consistent sample set of anodic aluminum oxide (AAO) membranes with varying porosity, interpore distances, and phases. The small feature size (wall thickness) of the nanoporous structure was identified as the key parameter to trigger and enhance nonbrittle, quasi‐ductile nanopore deformations, regardless of material phase. With small wall thickness (<~100 nm), shear‐banding‐like and foam‐like compressed nanopores were observed with amorphous AAO samples due to increased open space within long‐range disordered atomic arrangement, while shear‐banding‐like arrays of collapsed nanopores were observed with polycrystalline AAO samples due to grain boundary sliding and nanocrack formation. The above obtained knowledge can be a useful reference for the future design and applications of nanoporous ceramics with enhanced ductility, and thus fracture toughness, but without sacrificing stiffness, hardness, and strength. Future work includes scalable manufacturing of nanoporous structures with tunable pores (porosity, size, and distribution), grains, and interfaces using field assisted sintering technology (FAST), and their multi‐scale structure‐property relationship study. 相似文献
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The effect of reaction gas and catalyst on the growth of carbon nanotubes (CNTs) in the anodic aluminum oxide (AAO) nano-template was investigated. A mechanism of CNT growth was proposed, which involves the competitive catalytic carbon deposition between on the Co catalyst particles electrodeposited at the bottom of the pores and on the AAO template itself. Presence of H2 in the reacting gas mixture significantly affected the morphology and the wall structure of synthesized CNTs: CNTs of high crystallinity grew out of pores with H2 while no CNTs overgrew in the absence of H2. CNT synthesis by CO disproportionation showed a lower growth rate and a higher degree of ordering than those grown by C2H2 pyrolysis. The unified mechanism of CNT growth on AAO template is also proposed. 相似文献
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High resolution scanning electron microscopy has been used to examine the morphology of the anodic formed on aluminum. The influence of inter-metallic particles on the structure of the anodic film is revealed and its possible significance on the subsequent durability of adhesive bonds is discussed. 相似文献