泡沫铝合金阳极氧化工艺研究

以草酸为电解液,对泡沫铝合金材料进行阳极氧化处理,制备多孔有序阳极氧化铝阵列模板,采用SEM扫描电镜对其形貌进行分析.研究了电流密度、电解液浓度、电解温度等条件对氧化铝膜结构的影响,并对一步法和两步法制得的多孔氧化铝膜进行了比较,结果表明,氧化膜上的微孔分布均匀,孔径大小基本相同;两步阳极氧化法制备的多孔氧化铝模板的有序性优于一步氧化法.     

高度有序多孔阳极氧化铝模板的制备

为了得到纳米孔排列高度有序的多孔阳极氧化铝模板,以0.3 mol·L-1的草酸为电解液研究了模板的制备工艺.采用场发射扫描电子显微镜(FE-SEM)对多孔氧化铝模板的表面形貌进行表征,X射线衍射分析高纯铝及氧化膜的结构.实验结果表明,铝基体不经过高温退火处理,同样能够得到高度有序的氧化铝膜,简化了多孔氧化铝膜的制备工艺.分别讨论了阳极氧化电压和电解液温度对多孔阳极氧化铝膜的形貌及孔径的影响,并对一步法和两步法制得的多孔氧化铝膜进行比较,结果表明,两步阳极氧化法制备的多孔氧化铝模板的有序性优于一步氧化法.XRD分析证实,多孔氧化铝膜由非晶态的Al2O3组成.     

双扩散AAO模板法制备AgCl纳米线及其光催化性能

采用二次阳极氧化法,制得具有一定厚度有序性较高的阳极氧化铝(AAO)模板,并结合溶液的双扩散法制备AgCl纳米线,利用XRD、SEM和TEM等分析手段对模板和纳米线进行了表征,结果表明,用该方法制备的AgCl纳米线阵列分布均匀,取向性好,直径与AAO模板的孔径一致.通过纳米线阵列膜对罗丹明B的降解情况对其光催化活性进行了测试,结果表明,AgCl纳米线具有良好的光催化性能.     

无阻挡层多孔阳极氧化铝膜板的制备

提出一种在中性的KCl溶液中用多孔阳极氧化铝作阴极,通过电解在阴极产生OH-腐蚀阻挡层,制备无阻挡层氧化铝模板的新方法.用扫描电镜对模板进行了表征.结果表明,在草酸溶液中,制得的氧化铝模板孔径为70～80nm,孔间距为130nm,孔密度约8×109/cm2,这种方法去阻挡层不扩大模板孔径,不影响纳米孔的纵横比.无阻挡层的氧化铝模板适合于直流电沉积和无电沉积金属纳米材料.     

表面处理对阳极氧化铝模板光发射性质的影响

阳极氧化铝模板是一种得到广泛研究和应用的重要模板物质。针对阳极氧化铝模板的光致发光起源问题进行了探讨,主要研究了表面因素是否对阳极氧化铝的发光有影响,以及如何影响的问题。利用二次阳极氧化法制备了阳极氧化铝模板,之后利用氩离子轰击氧化铝模板的表面,在室温下测定了氩离子处理后的氧化铝模板的发光特性,研究了氩离子轰击前后氧化铝模板的光致发光性质变化和氩离子轰击对氧化铝模板光发射性能的影响。结果表明,表面因素对阳极氧化铝模板的发光有重要影响。     

逐步升压法制备大面积小孔径阳极氧化铝模板

在酸性电解液中,采用逐步升压法制备了高度有序的大面积阳极氧化铝（anodic aluminumoxide,AAO）模板．与传统方法制得的AAO模板相比,其有效氧化面积提高了20多倍扫描电子显微镜（scanning electron microscope,SEM）对模板微观结构的表征结果表明,二者几乎具有相同的有序度和孔密度,且孔洞分布均匀．但相比之下,采用逐步升压法制备的模板孔径要小得多,电压为42V时制得的模板的平均孔径（32．4nm）约为传统方法制得的模板平均孔径（63．2nm）的1／2．     

表面处理对阳极氧化铝模板光发射性质的影响

阳极氧化铝模板是一种得到广泛研究和应用的重要模板物质。针对阳极氧化铝模板的光致发光起源问题进行了探讨，主要研究了表面因素是否对阳极氧化铝的发光有影响，以及如何影响的问题。利用二次阳极氧化法制备了阳极氧化铝模板，之后利用氩离子轰击氧化铝模板的表面，在室温下测定了氩离子处理后的氧化铝模板的发光特性，研究了氩离子轰击前后氧化...     

纳米多孔阳极氧化铝膜形貌的控制研究

采用38g／L的草酸溶液为电解液,制备了孔洞规则有序,孔径和厚度均一可控的氧化铝模板,并研究了阳极氧化工艺对阳极氧化铝膜形貌的影响。实验结果表明,采用38g／L的草酸溶液作为电解液,经两步法阳极氧化可制得孔径均一,排列规则的多孔阳极氧化铝膜。随着氧化电流密度的升高,氧化膜孔径逐渐增大。电流密度过大,反应放热严重,氧化铝膜孔径均匀性,孔洞形状规则性和有序性都下降。在恒电流密度条件下,氧化膜厚度随着氧化时问的延长呈线性增长,但对氧化铝膜孔径影响较小。     

多孔阳极氧化铝模板制备的研究进展

多孔阳极氧化铝(PAA)模板在制备纳米材料、光谱材料、磁性材料、生物传感材料、太阳能电池材料等领域有着极为广泛的应用。实现多孔阳极氧化铝模板的孔径、孔间距、氧化层厚度等参数的可控制备是获得最佳性能材料的关键。概述了近年来多孔阳极氧化铝模板制备的研究进展,简要介绍了在电化学方法制备条件下各种工艺因素对模板形貌的影响,并综述了利用多孔阳极氧化铝作为模板合成纳米材料的几种方法。     

模板法制备聚乙烯咔唑纳米结构中的浸润转变

采用溶液浸润多孔阳极氧化铝模板(AAO)的方法,在孔径为200nm的AAO模板中制备功能聚合物聚乙烯咔唑(poly(vinyl carbazole),PVK)一维纳米结构.SEM和TEM测试结果表明,2.5%和3.5%(质量分数)的PVK溶液可制得纳米管,其外径约为200nm,管壁厚度分别为30与70nm;而5.0%与10.0%(质量分数)的PVK溶液可制得纳米线,其直径约为200nm.提出了溶液浸润模板法中的完全浸润体系和部分浸润体系以及临界浸润浓度Cw.     

Biofunctionalization and capping of template synthesized nanotubes

Using alumina templates both nanotubes (open on both ends) and nano test tubes (open on only one end) have been synthesized from many different materials and these have great potential as delivery vehicles for biomedical applications. This review focuses on our recent results directed towards developing "smart" nanotubes for biomolecule delivery applications. While intensive efforts have focused on spherical nanoparticles that are easier to make, cylindrical particles or nanotubes offer many advantages. First, the tunable alumina template allows one to dictate both the pore diameter and length of the nanotube. In addition, template synthesized nanotubes can be differentially functionalized on their inner and outer surfaces. This review highlights these advantages in the contexts of drug extraction and antibody-antigen interactions, the synthesis of protein nanotubes, and recent advances in covalently capped ("corked") nanotubes designed to prevent premature payload leakage. Though diverse applications for nanotubes have already been discovered, many new and exciting paths await exploration.     

Template synthesis of gold nanotubes in an anodic alumina membrane

Nanotube-containing membranes prepared by the template method show promise for use as highly selective filters for membrane-based chemical and biological separations. Most of the work to date has been done on gold nanotubes prepared by electroless deposition of Au within the pores of polymeric filtration membranes. These polymeric filters have very low porosities (< 1%), and, as a result, the flux through Au nanotube membranes based on these templates is very low. In contrast, the other popular template membranes-anodic aluminas-have high porosities-30% to 50%. In spite of this potential advantage of anodic alumina templates, there have been no reports of electrolessly plated Au nanotubes within the pores of these templates. This is because the electroless plating method used to deposit Au nanotubes in polymeric templates does not work in aluminas. We have developed a modified electroless plating strategy that can be used to deposit high-quality Au nanotubes within the pores of the alumina templates. We describe this new plating method here.     

Preparation and Analysis of Porous Anodic Alumina Template on Silicon Substrate

Porous anodic alumina (PAA) template is widely used to prepare ordered nanostructure materials. But conventional PAA templates have been restricted for application in micro-electro-mechanical systems (MEMS) technology due to limitations such as shape and brittleness. In this article, a novel process of fabricating alumina porous template based on silicon wafer is described. Porous alumina films were formed by two-step anodization of aluminum layers sputter deposited on silicon wafer. The pore diameters range from 80 to 100 nm. The Pilling–Bedworth ratio of Al/Al₂O₃ was measured and calculated. Thickness of PAA template can be precisely controlled. This research provides an effective tool to nanofabrication in MEMS technology.     

阳极氧化铝膜的制备和磁性纳米阵列

目的 为了获得一定的纳米孔排列结构。方法 采用了电化学阳极氧化法制备氧化铝纳米结构。可以得到具有不同参数的密集排列的六角形结构膜,其中的纳米孔具有高绘横比。结果 我们制备了阳极氧化铝膜,而后得到了Ｆｅ纳米阵列,从磁滞回线讨论了它的垂直磁化特性。结论 以阳极氧化铝膜为模板,在其中沉积磁性纳米颗粒,可以得到了磁性纳米阵列,它具备高的垂直磁化特性。     

不同模板剂对介孔氧化铝孔径调节作用

以醇铝为原料,利用三种不同类型的模板剂对氧化铝的孔径进行调节,对各种模板剂的作用机理进行了初步探讨.研究结果表明：不同模板剂获得的介孔氧化铝的孔道结构基本一致,均为蠕虫状结构,模板剂的不同对介孔氧化铝孔径的影响较大,未加模板剂直接由溶胶-凝胶法获得的介孔氧化铝孔径分布较窄,孔径偏小;加入离子型模板剂能够形成孔径分布窄、孔径增大的介孔材料;加入非离子型模板剂则形成孔径更大,但孔径分布较宽的介孔氧化铝.     

Sparse nanowire arrays for facile transport measurements

Nanowires can be electrodeposited into partially etched porous alumina templates such that only a very small number of nanowires reach the top surface of the template. This allows transport measurements of small clusters or single nanowires in their alumina matrix by connecting leads to the hemispherical domes marking the protrusion of nanowires on the surface. Copper, nickel, and silver nanowires have been synthesized in this manner, and a more general synthesis method is proposed.     

Shape and size-controlled fabrication of ZnO nanostructures using novel templates

A simple wet chemical method was developed to control the size and shape of the Zinc oxide (ZnO) nanostructures in the presence of new, efficient, and low-cost templates like ameline, sorbitol, and polyethylene glycol (PEG, M_w = 200) at low temperature within a few minutes. Nanorods and nanoparticles have been achieved through applying these templates and tuning other growth parameters. The products were characterised by X-ray diffraction (XRD), scanning electron microscopy (SEM), and transmission electron microscopy (TEM). The effect of the growth parameters such as template, Zn²⁺ source/Template ratio, pH, reaction time, and temperature on the growth and morphology of ZnO nanostructures have been investigated in detail. The results revealed that template has an important effect on the morphology and size of the ZnO nanostructures. Also, reaction time is believed to be a key factor because it can change the quality of nano ZnO produced by this method. By tuning these parameters nanorods, nano particle/rod, nano porous structures have been achieved.     

高度有序多孔氧化铝模板的制备工艺与生长机制的研究

采用二次氧化法制备出高度有序的多孔氧化铝模板，结合扫描电镜和原子力显微镜对其结构、形貌进行观察和表征。研究了铝箔预处理和温度等对多孔氧化铝模板孔洞有序性的影响，讨论了有序孔洞的自组织生长机理。     

阳极氧化工艺制备氧化铝模板

多孔氧化铝模板是一种用于制作纳米结构材料的模板.为了制作出理想的模板,采用不同的阳极氧化工艺制备多孔氧化铝模板,通过改变工艺参数研究了模板孔径的变化规律,结果表明,在适宜条件下,纳米级氧化铝模板具有六方紧密堆积柱状结构,在每个六棱柱的中心有一个与膜表面垂直的圆柱孔.在一定范围内,随着氧化电压、电流密度、反应温度、铝片纯度的增加氧化铝模板的孔径也随之增加.     

Postgrowth processing of carbon nanotube arrays-enabling new functionalities and applications

Highly ordered carbon nanotube arrays were fabricated by pyrolysis of acetylene using anodic-aluminum-oxide templates. To avoid the natural tendency of the nanotubes sticking together and forming haystack-like bundles when exposing the nanotubes from the growth template, a new postgrowth treatment process using a mixture of 6 wt% phosphoric acid and 1.8 wt% chronium oxide as the etchant, and 0.1 wt% Gum Arabic or 5 wt% polymethacrylic acid as the dispersant, was developed yielding for the first time well aligned and spatially free-standing carbon nanotube arrays. The dispersants can be adsorbed on both the surface of carbon nanotubes and that of the alumina film resulting in the elimination of aggregation of exposed carbon nanotubes, a more uniform dissolution of alumina, and a lower, thereby, more controllable etching rate. The as-prepared carbon nanotube arrays, which are vertically aligned and well separated could be used for many applications such as mechanical oscillators, field emission, and sensors, and the exposed nanotubes offer a good platform for study on collective behavior of electrical and magnetic nano arrays.