共查询到15条相似文献,搜索用时 453 毫秒
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研究了一种简单新颖的制备Al2O3纳米线薄膜的电化学方法。以阳极氧化法在高纯铝片表面制备多孔阳极氧化铝的工艺为基础,在草酸电解液中通过一次阳极氧化过程,将阳极氧化铝孔壁溶解形成Al2O3纳米线,均匀覆盖在阳极氧化铝有序孔道的上方,得到一种特殊结构的纳米线薄膜。使用扫描电镜、高分辨透射电镜和X-射线能谱仪对纳米线的形貌、结构及成分进行了表征分析。并结合扫描电镜对不同反应时间长度的产物形貌来观察纳米线的生成过程。探讨了Al2O3纳米线薄膜的生成机理。 相似文献
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研究了一种简单新颖的制备氧化铝纳米线薄膜的电化学方法.以阳极氧化法在高纯铝片表面制备多孔阳极氧化铝(AAO)的工艺为基础,在草酸电解液中将AAO孔壁溶解形成氧化铝纳米线,均匀覆盖在AAO有序孔道的上方,得到一种特殊结构的纳米线薄膜.对实验产物纳米线的形貌、结构及成分进行了表征分析,并探讨了氧化铝纳米线薄膜的生成机理. 相似文献
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以高纯铝为基体,用2次阳极恒直流阳极氧化的方法在磷酸-草酸混酸体系中制备出大孔氧化铝薄膜;以大孔氧化铝薄膜为基体,用中性弱阳离子溶液为介质在电化学工作站在3电极体系中氧化出介孔氧化铝薄膜;再在硫酸环境下用恒电压阳极氧化法制备出微孔薄膜。通过对3种不同孔径的氧化铝薄膜的形貌及成分进行表征,运用拉曼光谱比较三种不同孔径氧化铝薄膜对不同浓度硅烷缓蚀剂的吸附担载能力,以及电化学测试检验其担载不同浓度硅烷缓蚀剂后耐腐蚀能力,得出具有最强耐蚀能力时的氧化铝膜的最佳孔径和此时担载硅烷缓蚀剂的最佳浓度,电化学测试结果表明介孔薄膜的电化学阻抗可达10~7。 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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用二次阳极氧化法制备了多孔氧化铝膜,并以之为模板,用直流电沉积法成功地将Co金属组装入多孔氧化铝膜的纳米孔洞中,观察与测试了Co—氧化铝纳米阵列结构和磁性。结果发现,二次阳极氧化法在短时间内就能制备出较为有序的多孔氧化铝膜;Co—氧化铝纳米阵列中的Co金属纳米线有一定的结晶择优取向,并且当多孔氧化铝模板的孔径减小,择优取向发生优化;Co—氧化铝纳米阵列有明显的磁各向异性。 相似文献
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Porous anodic alumina (PAA) film has recently attracted much attention as a key material for the fabrication of various nanostructures. In this study, a multi-step anodization and leaching process was employed to produce three-dimensional nanometer scale structured film. During the leaching process, the porous alumina film was dipped in phosphoric acid solution for pore widening. Each anodization process was followed by this leaching process. This method produced alumina film with multi-step structure. Meanwhile, with five-step film production, the structure showed inverted cone structure. We produced the low aspect ratio pores of this structure, which would be applicable for fabrications of nanomaterials. In addition, the aspect ratio was controlled by changing the anodization duration. 相似文献
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《Ceramics International》2019,45(10):12727-12733
Alumina fiber was fabricated by an anodic oxidation process from pure aluminum or a chemical dissolution process from porous alumina. In the experiments, porous alumina layer was firstly formed on the surface of pure aluminum by anodic oxidation process in phosphoric acid electrolyte. The alumina fiber was obtained by either further anodic oxidation process or a chemical dissolution process from the porous alumina layer. The thickness of the porous alumina layer, the diameter and wall thickness of the pores in the porous alumina layer, and the length and diameter of the obtained alumina fiber were examined. The formation mechanism of the alumina fiber was discussed. 相似文献
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Highly crystallized BaWO4 films have been prepared on a tungsten substrate in an alkaline solution containing barium ions by an electrochemical method with a constant direct current density of 1 mA/cm2 at room temperature (25°C). The average grain size was about 13 μm, and the thickness about 9 μm after a treatment time of 35 min. The dependence of cell voltage on deposition time was divided into three steps: conduction, anodic oxidation, and breakdown steps. The BaWO4 film formed during the first step. Electrochemical dissolution of metal tungsten occurred with an accompanying positive change of overpotential in the first step. The crystallization of BaWO4 was characterized by three-dimensional nucleation. In the second step, an amorphous tungsten oxide film formed, thereby increasing the potential. An electrical breakdown occurred in the third step, and the breakdown voltage (about 90 V) was practically the same as those of anodic tungsten oxide films. 相似文献
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本文采用循环伏安法研究了镀银铂电极在溴化钾溶液中的成核过程及氧化动力学,结果表明:AgBr的形成包括三个步骤,首先在银表面某些吸附Br~-的特殊位置上以平面方式成核,然后经过二个三维的成核步骤。在较低浓度的KBr溶液中,AgBr的形成由溶液中的Br~-迁移控制。在较高浓度的溶液中,由于生成的AgBr膜是高度松散的,速度控制步骤转化为在膜孔内Br~-的迁移。随着AgBr的生成以及AgBr的溶解沉积作用,膜孔被堵塞,同时反应速度转化为由AgBr膜中的Ag~+迁移控制。电镜结果也支持了以上结论。 相似文献