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Surface Pre Treatments And Fabrication Of Highly Ordered Anodic Aluminum Oxide Nanopores At Room Temperature
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Book Synopsis Surface Pre-treatments and Fabrication of Highly Ordered Anodic Aluminum Oxide Nanopores at Room Temperature by : Sampath Chennuri
Download or read book Surface Pre-treatments and Fabrication of Highly Ordered Anodic Aluminum Oxide Nanopores at Room Temperature written by Sampath Chennuri and published by . This book was released on 2008 with total page 162 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Nanoporous Alumina written by Dusan Losic and published by Springer. This book was released on 2015-07-17 with total page 371 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book gives detailed information about the fabrication, properties and applications of nanoporous alumina. Nanoporous anodic alumina prepared by low-cost, simple and scalable electrochemical anodization process due to its unique structure and properties have attracted several thousand publications across many disciplines including nanotechnology, materials science, engineering, optics, electronics and medicine. The book incorporates several themes starting from the understanding fundamental principles of the formation nanopores and theoretical models of the pore growth. The book then focuses on describing soft and hard modification techniques for surface and structural modification of pore structures to tailor specific sensing, transport and optical properties of nano porous alumina required for diverse applications. These broad applications including optical biosensing, electrochemical DNA biosensing, molecular separation, optofluidics and drug delivery are reviewed in separated book chapters. The book appeals to researchers, industry professionals and high-level students.
Book Synopsis Fabrication of Highly Ordered Anodic Aluminium Oxide Templates on Silicon Substrates by :
Download or read book Fabrication of Highly Ordered Anodic Aluminium Oxide Templates on Silicon Substrates written by and published by . This book was released on 2007 with total page 6 pages. Available in PDF, EPUB and Kindle. Book excerpt: The controlled fabrication of highly ordered anodic aluminium oxide (AAO) templates of unprecedented pore uniformity directly on Si, enabled by new advances on two fronts -- direct and timed anodisation of a high-purity Al film of unprecedented thickness (50 micrometres) on Si, and anodizing a thin but pre-textured Al film on Si, has been reported. To deposit high-quality and ultra-thick Al on a non-compliant substrate, a prerequisite for obtaining highly ordered pore arrays on Si by self-organisation while retaining a good adhesion, a specially designed process of e-beam evaporation followed by in situ annealing has been deployed. To obtain an AAO template with the same high degree of ordering and uniformity but from a thin Al film, which is not achievable by the self-organisation alone, pre-patterning of the thin Al surface by reactive ion etching using a free-standing AAO mask that was formed in a separate process was performed. The resultant AAO/Si template provides a good platform for integrated growth of nanotube, nanowire or nanodot arrays on Si. Template-assisted growth of carbon nanotubes (CNTs) directly on Si was demonstrated via a chemical vapour deposition method. By controllably removing the AAO barrier layer at the bottom of the pores and partially etching back the AAO top surface, new CNT/Si structures were obtained with potential applications in field emitter, sensors, oscillators and photodetectors.
Book Synopsis The Metallurgy of Anodizing Aluminum by : Jude Mary Runge
Download or read book The Metallurgy of Anodizing Aluminum written by Jude Mary Runge and published by Springer. This book was released on 2018-02-01 with total page 492 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this book, the history of the concepts critical to the discovery and development of aluminum, its alloys and the anodizing process are reviewed to provide a foundation for the challenges, achievements, and understanding of the complex relationship between the aluminum alloy and the reactions that occur during anodic oxidation. Empirical knowledge that has long sustained industrial anodizing is clarified by viewing the process as corrosion science, addressing each element of the anodizing circuit in terms of the Tafel Equation. This innovative approach enables a new level of understanding and engineering control for the mechanisms that occur as the oxide nucleates and grows, developing its characteristic highly ordered structure, which impact the practical function of the anodic aluminum oxide.
Book Synopsis Functional Thin Films Technology by : Sam Zhang
Download or read book Functional Thin Films Technology written by Sam Zhang and published by CRC Press. This book was released on 2021-08-09 with total page 446 pages. Available in PDF, EPUB and Kindle. Book excerpt: Functional Thin Films Technology features the functional aspects of thin films, such as their application in solar selective absorbers, fiber lasers, solid oxide fuel cells, piezo-related areas, catalysts, superhydrophobicity, semiconductors, and trace pesticides detection. It highlights developments and advances in the preparation, characterization, and applications of functional micro-/nano-scaled films and coatings. This book Presents technologies aimed at functionality used in nanoelectronics, solar selective absorbers, solid oxide fuel cells, piezo-applications, and sensors Covers absorbers, catalysts, anodic aluminum oxide, superhydrophobics, and semiconductor devices Features a chapter on transport phenomena associated to structures Discusses transport phenomena and material informatics This second volume in the two-volume set, Protective Thin Coatings and Functional Thin Films Technology, will benefit industry professionals and researchers working in areas related to semiconductors, optoelectronics, plasma technology, solid-state energy storages, and 5G, as well as advanced students studying electrical, mechanical, chemical, and materials engineering.
Book Synopsis Fabrication of Metal/Oxide Nanostructures by Anodization Processes for Biosensor, Drug Delivery and Supercapacitor Applications by : Po-Chun Chen
Download or read book Fabrication of Metal/Oxide Nanostructures by Anodization Processes for Biosensor, Drug Delivery and Supercapacitor Applications written by Po-Chun Chen and published by . This book was released on 2015 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This dissertation proposed to initiate the research into the fabrication of metal/oxide nanostructures by anodization process for biosensor, drug delivery and supercapacitor applications by producing different nanostructures which lead to the potential for various applications. This study focuses on the establishment of the knowledge and techniques necessary to perform metal/oxide nanostructures on biological and energy applications. This study will investigate: (1) the sensor and drug delivery applications of micro/nano structures; (2) novel processes to innovate anodic aluminum oxide nanotube template; (3) the supercapacitor applications of anodic titanium oxide. First, the extremely high surface area AAO coated microneedle and microneedle array can be developed as sensor and drug delivery devices. Due to the large surface area of the AAO, the film can absorb indicators to make it sensitive to testing targets. pH detection was demonstrated to show the sensing capability of the microneedle. Then, the microneedles were further built as an array by combining micromachining technique. The microneedle array provides a 3-D structure that possesses several hundred times more surface area and capacity than a traditional nanochannel template. Second, the nanoengineering process was conducted to innovate anodic aluminum oxide nanotube template. Guided anodization assisted by nanoimprint process formed AAO arrays that can be formed on controlled locations. More importantly, it shows the periodically ordered AAO array with different sizes of nanopores. With the improved AAO template, melting injection, electro/electroless deposition and sol-gel deposition were conducted to fabricate Ni nanowires/ TiO2 nanotubes, Ni/BaTiO3 core-shell nanotubes, and UHMWPE nanotubes. Third, various Ti-based alloys were anodized to form ordered nanotubes for supercapacitor application. Ti alloy oxide contains some porous layers which are not presented on TiO2 nanotube film. Thus, Ti alloys anodized oxide nanotubes have better supercapacitor behaviors than the conventional TiO2 nanotubes. However, a high surface area nanoporous Ti/TiO2 structure, which was fabricated by selective etching process, can accumulate large quantity of electrons and energy for supercapacitor needs. Additionally, nanoporous metals obtained by dealloying hold a unique combination of a highly conductive network and a bicontinuous open. The characteristics formed through dealloying also present a nice charge/discharge behavior and a good capacitance performance. The electronic version of this dissertation is accessible from http://hdl.handle.net/1969.1/152487
Book Synopsis Electro-Chemo-Mechanics of Anodic Porous Alumina Nano-Honeycombs: Self-Ordered Growth and Actuation by : Chuan Cheng
Download or read book Electro-Chemo-Mechanics of Anodic Porous Alumina Nano-Honeycombs: Self-Ordered Growth and Actuation written by Chuan Cheng and published by Springer. This book was released on 2015-05-23 with total page 287 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this thesis, real-time evolution of the nanopore channel growth and self-ordering process in anodic nanoporous alumina are simulated on the basis of an established kinetics model. The simulation results were in accordance with the experiments on the (i) growth sustainability of pore channels guided by pre-patterns; and (ii) substrate grain orientation dependence on self-ordering. In addition, a new fabrication method for the rapid synthesis of highly self-ordered nanoporous alumina is established, based on a systematic search for the self-ordering conditions in experiments. Lastly, it reports on a novel surface-charge induced strain in nanoporous alumina-aluminium foils, which indicates that nanoporous alumina can be used as a new type of actuating material in micro-actuator applications.
Book Synopsis Nanostructured Materials in Electrochemistry by : Ali Eftekhari
Download or read book Nanostructured Materials in Electrochemistry written by Ali Eftekhari and published by John Wiley & Sons. This book was released on 2008-06-25 with total page 489 pages. Available in PDF, EPUB and Kindle. Book excerpt: Providing the unique and vital link between the worlds of electrochemistry and nanomaterials, this reference and handbook covers advances in electrochemistry through the nanoscale control of electrode structures, as well as advances in nanotechnology through electrochemical synthesis strategies. It demonstrates how electrochemical methods are of great scientific and commercial interest due to their low cost and high efficiency, and includes the synthesis of nanowires, nanoparticles, nanoporous and layered nanomaterials of various compositions, as well as their applications -- ranging from superior electrode materials to energy storage, biosensors, and electroanalytical devices.
Book Synopsis Electrochemical Anodization of Aluminium at Room Temperature by Electronically Controlled Direct Current Circuit by : Alaba Oladeji Araoyinbo
Download or read book Electrochemical Anodization of Aluminium at Room Temperature by Electronically Controlled Direct Current Circuit written by Alaba Oladeji Araoyinbo and published by . This book was released on 2014 with total page 149 pages. Available in PDF, EPUB and Kindle. Book excerpt: Anodic aluminum oxide (AAO) films have been investigated and used in numerous products for more than 50 years. The morphologies of the AAO films can be classified into barrier-type and porous-type. Barrier-type films consist of compact amorphous alumina, while porous-type films comprise of a thin barrier layer next to the metal and an outer layer of porous alumina. There are limitations in the way nanoporous alumina has been fabricated. The limitations are the freezing of the electrolyte with a temperature controlled bath, very high potential and prolong anodizing time have also been used during AAO fabrication. In order to overcome these shortcomings associated with the fabrication of this porous alumina film at room temperature, this study aim to create a novel process to fabricate nanoporous alumina film with controlled pore diameters that is externally controlled by direct current circuit. The steps followed during the electronic circuit design set-up involved specification, design/cost, verification and testing of the circuit. The specification of the design is to address the issue of temperature, low potential anodization and the value of the most critical process parameter which is current, and the less critical parameters which are temperature and concentration of electrolyte. The next step of the design was the identification of important components i.e. capacitors and resistors that are crucial during the preliminary design stage. The components are cheap and provide a form of stability and control of the circuit. The verification and testing was done by computer simulation (PhET software kit) and practical testing of the circuit design. The computer simulations provided the information about the most suitable circuit design under different simulated conditions. The simulation identified a series connection of a single 60 V rated capacitor and a 500 ohms resistor to be the most suitable circuit design to limit the influence of the process parameters.
Download or read book Plating and Surface Finishing written by and published by . This book was released on 2003 with total page 446 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Variational Anodic Oxidation of Aluminum for the Formation of Conically Profiled Nanoporous Alumina Templates by : Patrick D. Wallace
Download or read book Variational Anodic Oxidation of Aluminum for the Formation of Conically Profiled Nanoporous Alumina Templates written by Patrick D. Wallace and published by . This book was released on 2012 with total page 144 pages. Available in PDF, EPUB and Kindle. Book excerpt: Anodic oxidation of metals, otherwise known as anodization, is a process by which the metal in question is intentionally oxidized via an electrochemical reaction. The sample to be oxidized is connected to the anode, or positive side of a DC power source, while a sample of similar characteristics is attached to the cathode or negative side of the same power source. Both leads are then immersed in an acidic solution called the electrolyte and a current is passed between them. Certain metals such as aluminum or titanium anodized in this way form a porous oxide barrier, the characteristics of which are dependent on the anodization parameters including the type of acid employed as the electrolyte, pH of the electrolyte, applied voltage, temperature and current density. Under specific conditions the oxide formed can exhibit highly ordered cylindrical nanopores uniformly distributed in a hexagonal pattern. In this way anodization is employed as method for nanofabrication of ordered structures. The goal of this work is to investigate the effects of a varied potential difference on the anodization process. Specifically to affect a self-assembled conical pore profile by changing the applied voltage in time. Although conical pore profiles have been realized via post-processing techniques such as directed wet etching and multi-step anodization, these processes result in pore dimensions generally increasing by an order of magnitude or more. To date there has been reporting on galvanostatic or current variations which directly effected the resulting pore profiles, but to our knowledge there has not been a reported investigation of potentiostatic or voltage variation on the anodization process. We strive to realize a conical pore profile in process with the traditional two-step anodization method while maintaining the smallest pore dimensions possible. Pores having diameters below 20nm with aspect ratios about 1.0 would be ideal as those dimensions would be much closer to some of the characteristic lengths governing the quantum confined spatial domain. Thus we set out to answer the question of what effect a time varied potential difference will have on the traditional two-step anodization method, a technique we refer to as variational iodization, and if in fact conically profiled nanopores can be realized via such a technique.
Book Synopsis Porous Anodic Aluminum Oxide Scaffolds ; Formation Mechanisms and Applications by : Jihun Oh
Download or read book Porous Anodic Aluminum Oxide Scaffolds ; Formation Mechanisms and Applications written by Jihun Oh and published by . This book was released on 2010 with total page 161 pages. Available in PDF, EPUB and Kindle. Book excerpt: Nanoporous anodic aluminium oxide (AAO) can be created with pores that self-assemble into ordered configurations. Nanostructured metal oxides have proven to be very useful as scaffolds for growth of nanowires and nanotubes with tunable diameters and with tight diameter distributions. For 50 years, field-assisted dissolution of the oxide has been cited as the mechanism that leads to pore formation in alumina, and by analogy, porous anodic TiO2 and other functional metal oxides. We show that field-assisted dissolution models are consistent with the observed dependence of the Al2O3 dissolution rate on the electric field, as well as the existence of a critical field for pore initiation. However, we further show that the well-known ordered porous structure, which has a significantly different length scale, does not result from a field-induced instability, but is instead the result of a strain-induced instability with forced plastic deformation and flow of the oxide during further anodization. We demonstrate that these pore generation mechanisms can be controlled independently, even when they co-exist, by controlling the electric field across the oxide as well as the anodization conditions. We also show that mechanical confinement results in a dendritic pore structure. Through interpretation of these results we develop a generalized mechanism for ordered pore formation in AAO in analogy with cellular solidification. In addition, we report on abnormal behavior in anodic oxidation of Al in mechanically confined structures for formation of horizontal nanoporous anodic alumina oxide, H-AAO. Instead of smooth pore walls, periodic dendrite inner pore structures form, the growth rate is suppressed to 5 % of its value during bulk anodization under the same conditions, and a steady-state is never reached. These anomalies associated with formation of H-AAO originate from suppressed volume expansion and plastic flow of Al2O3 confined by the SiO2 hard mask. By determining new anodization conditions leading to zero volume expansion, dendritic H-AAO can be avoided and kinetic retardation can be minimized. A new method for perforation of the AAO barrier layer has been developed, based on anodization of Al/W bilayer films on substrates. When Al/W bilayer films are anodized and pores approach the Al/W interface, tungsten oxide forms and penetrates the alumina barrier oxide, in part, due to enhanced plasticity of the alumina layer. By selectively etching the tungsten oxide, the barrier oxide can be removed and the base of the pores opened, without etching of the AAO. Finally, we further refined the selective barrier perforation process using the W interlayer to develop a methodology for fabrication of through-pore AAO scaffolds on any conducting substrate (AS) by anodizing an Al/W/AS tri-layer. Structural and kinetic study of the WO3 extrusion revealed that the anodization of W consumes a fixed thickness of the W layer in acidic electrolytes under specific anodization conditions. Based on this study, the optimum thickness of the W interlayer in the Al/W/Au tri-layer was measured for various anodization conditions. Through-pore AAOs were fabricated on Au layers with exposure of the surface at the base of the pores, using the optimum W thickness without a violent O2 evolution reaction and without changing the pore diameters. With scaffolds made using this methodology, vertically-aligned free-standing Au and Pt nanowires with diameters ranging from about 12 nm to about 120 nm were grown by electrodeposition on a gold substrate.
Book Synopsis Fabrication of Metal–Organic Framework Derived Nanomaterials and Their Electrochemical Applications by : Wei Xia
Download or read book Fabrication of Metal–Organic Framework Derived Nanomaterials and Their Electrochemical Applications written by Wei Xia and published by Springer. This book was released on 2018-04-03 with total page 148 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis systematically introduces readers to a new metal-organic framework approach to fabricating nanostructured materials for electrochemical applications. Based on the metal-organic framework (MOF) approach, it also demonstrates the latest ideas on how to create optimal MOF and MOF-derived nanomaterials for electrochemical reactions under controlled conditions. The thesis offers a valuable resource for researchers who want to understand electrochemical reactions at nanoscale and optimize materials from rational design to achieve enhanced electrochemical performance. It also serves as a useful reference guide to fundamental research on advanced electrochemical energy storage materials and the synthesis of nanostructured materials.
Book Synopsis Proceedings of the ASME Materials Division : the ASME Non-Destructive Evaluation Division : and the ASME Pressure Vessels and Piping Division--2006 by :
Download or read book Proceedings of the ASME Materials Division : the ASME Non-Destructive Evaluation Division : and the ASME Pressure Vessels and Piping Division--2006 written by and published by American Society of Mechanical Engineers. This book was released on 2007 with total page 790 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Nanostructured Anodic Metal Oxides by : Grzegorz D. Sulka
Download or read book Nanostructured Anodic Metal Oxides written by Grzegorz D. Sulka and published by Elsevier. This book was released on 2020-03-27 with total page 484 pages. Available in PDF, EPUB and Kindle. Book excerpt: Nanostructured Anodic Metal Oxides: Synthesis and Applications reviews the current status of fabrication strategies that have been successfully developed to generate nanoporous, nanotubular and nanofibrous anodic oxides on a range of metals. The most recent achievements and innovative strategies for the synthesis of nanoporous aluminum oxide and nanotubular titanium oxide are discussed. However, a special emphasis is placed on the possibility of fabrication of nanostructured oxide layers with different morphologies on other metals, including aluminum titanium, tantalum, tin, zinc, zirconium and copper. In addition, emerging biomedical applications of synthesized materials are discussed in detail. During the past decade, great progress has been made both in the preparation and characterization of various nanomaterials and their functional applications. The anodization of metals has proven to be reliable for the synthesis of nanoporous, nanotubular and nanofibrous metal oxides to produce a desired diameter, density, aspect ratio (length to diameter) of pores/tubes, and internal pore/tube structure. Provides an in-depth overview of anodization techniques for a range of metals Explores the emerging applications of anodic metal oxides Explains mechanisms of formation valve metal oxides via anodization
Book Synopsis Electrodeposited Nanowires and their Applications by : Nicoleta Lupu
Download or read book Electrodeposited Nanowires and their Applications written by Nicoleta Lupu and published by BoD – Books on Demand. This book was released on 2010-02-01 with total page 238 pages. Available in PDF, EPUB and Kindle. Book excerpt: The book offers a new and complex perspective on the fabrication and use of electrodeposited nanowires for the design of efficient and competitive applications. While not pretending to be comprehensive, the book is addressing not only to researchers specialized in this field, but also to Ph.D. students, postdocs and experienced technical professionals.
Book Synopsis The Surface Treatment and Finishing of Aluminium and Its Alloys by : P. G. Sheasby
Download or read book The Surface Treatment and Finishing of Aluminium and Its Alloys written by P. G. Sheasby and published by . This book was released on 2001 with total page 632 pages. Available in PDF, EPUB and Kindle. Book excerpt:
