Fabrication of porous anodic aluminum oxide by hybrid pulse anodization at relatively high potential

Chung, Chen-Kuei; Liao, Mei-Hsiu; Khor, O. K.

doi:10.1007/s00542-013-1948-z

Cited by 6 publications

(6 citation statements)

References 22 publications

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“…By contrast, the AAO formed using conventional direct current anodization (DCA) with the same anodizing potential contained many small irregular pores around each original pore [ Figure 2(a)]. [31] On the other hand, it is clearly seen that the reduction of the irregular small branch pores in AAO 6 formed by HPA, as shown in Figure 2 [33] Besides, ultrathin AAO membranes were also be used as masks for the fabrication of nanoparticle arrays on different surfaces. The AAO membranes can be formed directly on some surfaces, such as silicon and indium tin oxide.…”

Section: Fabrication Of Anodic Aluminum Oxide Membranementioning

confidence: 99%

“…By contrast, the AAO formed using conventional direct current anodization (DCA) with the same anodizing potential contained many small irregular pores around each original pore [Figure 2(a)]. [31] On the other hand, it is clearly seen that the reduction of the irregular small branch pores in AAO formed by HPA, as shown in Figure 2(b). Chung et al also found that the HPA technique not only merits manufacturing convenience and cost reduction but also promotes pore distribution uniformity of AAO at severe conditions of low-purity Al foils and relatively high room temperature.…”

Section: Fabrication Of Anodic Aluminum Oxide Membranementioning

confidence: 99%

“…Top-view SEM micrographs of AAO nanostructures formed by (a) DCA 60 V, (b) HPA 60 V with following pore widening for 10 min [31]. Controlling the size and uniformity of the pores is key in manipulating the structure and properties of the materials confined within the pores of AAO.…”

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confidence: 99%

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Composite Nanowires for Room-Temperature Mechanical and Electrical Bonding

Cui

2016

Advances in Nanocomposites

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At millimeter dimension or less, the conventional bonding technology in electronic assembly relies heavily on reflow soldering and suffers from severe performance and reliability degradation.Meanwhile, the traditional high temperature bonding process (easily reach 220 o C) tends to result in undesired thermal damage and residual stress at the bonding interface. It is therefore a major challenge to find a means to preparing room-temperature connectors or fasteners with good mechanical and electrical bonding. Very recently, composite nanowire have been used to fabricate room-temperature fasteners. In this chapter, we summarize the state-of-the-art progress on the use of 2 composite nanowires for room-temperature mechanical and electrical bonding. Using anodic aluminum oxide (AAO) and polycarbonate (PC) membrane as template, the fabrication of Cu/parylene and Cu/polystyrene nanowires were described. Meanwhile, the fabrication of carbon nanotube (CNTs) array was summarized. Then, the performances of the composite nanowires (Cu/parylene, Cu/polystyrene and CNT-Cu/parylene) used as surface fastener for room-temperature mechanical and electrical bonding were demonstrated.

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Section: Fabrication Of Anodic Aluminum Oxide Membranementioning

confidence: 99%

“…By contrast, the AAO formed using conventional direct current anodization (DCA) with the same anodizing potential contained many small irregular pores around each original pore [Figure 2(a)]. [31] On the other hand, it is clearly seen that the reduction of the irregular small branch pores in AAO formed by HPA, as shown in Figure 2(b). Chung et al also found that the HPA technique not only merits manufacturing convenience and cost reduction but also promotes pore distribution uniformity of AAO at severe conditions of low-purity Al foils and relatively high room temperature.…”

Section: Fabrication Of Anodic Aluminum Oxide Membranementioning

confidence: 99%

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Composite Nanowires for Room-Temperature Mechanical and Electrical Bonding

Cui

2016

Advances in Nanocomposites

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“…Aluminum alloys have been widely applied as both structural and functional materials [1][2][3]. Anodic oxidation is almost a requisite treatment technique to achieve variable excellent performance [4,5] in terms of enhancing the interfacial bonding between topcoating and aluminum substrates [6], improving corrosion-preventing ability [4], building multilayer solid super-capacitors [7], assembling self-confinement nanomaterials [4,5] and growing functional membranes with anodizing preparatory coating [6,[8][9][10]. Typically, 1060 aluminum alloys are the series used as industrial pure aluminum, while 2024 and 7075 are important aluminum alloys for aviation.…”

Section: Introductionmentioning

confidence: 99%

Preparation of 1060, 2024 and 7075 Aluminum Alloy Anodic Oxide Films

Jing

Wang

Zhao³

et al. 2021

Coatings

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On aluminum alloys of grades 1060, 2024 and 7075, regular and highly uniform oxide films were formed by anodic oxidation. Anodizing was carried out at a constant pressure in a phosphoric acid solution of various concentrations. Using scanning electron microscopy (SEM) and X-ray diffraction (XRD), the optimal characteristics of the method of anodic oxidation for forming uniform oxide films on aluminum alloys were determined: anodic oxidation time, temperature, voltage and the concentration of H3PO4. It was found that, in the process of anodizing, the films have gone through four stages: a non-porosity stage, a mixed stage, an ordered porosity stage and a disordered porosity stage.

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“…Pulsed anodizing method, a promising alternative anodic technique, performs with obvious superiorities in fast oxidation speed, easy heat dissipation, and high oxidation efficiency. , In view of discontinuous anodizing in the pulsed anodic process, Joule heat is easier to diffuse toward the electrolyte compared with DC anodization, avoiding local burning losses in the oxidation process. , Furthermore, many studies have reported that the pulsed method improves efficiency and saves energy due to the unique behavior of ions in a non-uniform electric field when it is used in electroplating, electrodeposition, coloring, and anodizing. , Besides, the alumina film prepared by pulsed anodizing has the advantages of uniformity, compactness, and crystallinity; thus, it is widely used in the surface treatment of aluminum and its alloys, which improves the hardness, wear resistance, and corrosion resistance . However, the previous work mainly focused on porous anodic alumina; there are few reports on barrier anodic alumina.…”

Section: Introductionmentioning

confidence: 99%

Symmetric Pulsed Anodizing of Aluminum Foil for Aluminum Electrolytic Capacitors

Lin

Xiong

et al. 2020

ACS Appl. Energy Mater.

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Alumina as dielectric material is commonly prepared via anodizing high purity etched foils in electrolyte, which vitally determines the performance of aluminum electrolytic capacitor. However, the traditional direct-current (DC) anodizing is limited due to a large amount of Joule heat production, a space charge layer, and unnecessary side reactions, which result in great energy consumption and a poor quality of oxide film. In this work, the symmetric pulsed-current (SPC) anodizing is introduced into the anodization of aluminum foil for electrolytic capacitor. SPC anodizing can contribute to the diffusion of heat during the nonanodization period because of its pulse mode, lowering the thermally induced dissolution of alumina reacted with water. In addition, SPC anodizing can suppress the formation of a space charge layer by alternating the electric field so as to extract impurities out of the oxide film and lower the energy consumption. Moreover, the SPC samples own the denser barrier-type alumina, which have better crystallinity resulting in higher permittivity. Voltage−current output and side reactions during the anodizing process have been analyzed, demonstrating the lower energy consumption and higher production efficiency of the SPC method. In comparison with the DC anodized samples, the specific capacitances of SPC samples are elevated by 10.84% and the energy consumption of the SPC method is decreased by 25.5% in total. Therefore, the SPC anodizing method has a good prospect for industrialization of aluminum electrolytic capacitor.

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Fabrication of porous anodic aluminum oxide by hybrid pulse anodization at relatively high potential

Cited by 6 publications

References 22 publications

Composite Nanowires for Room-Temperature Mechanical and Electrical Bonding

Composite Nanowires for Room-Temperature Mechanical and Electrical Bonding

Preparation of 1060, 2024 and 7075 Aluminum Alloy Anodic Oxide Films

Symmetric Pulsed Anodizing of Aluminum Foil for Aluminum Electrolytic Capacitors

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