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Academic literature on the topic 'Anodisation'

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Published: 4 June 2021

Last updated: 8 June 2024

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Journal articles on the topic "Anodisation"

Mustafa, CM, MA Habib, and MS Islam. "Anodisation of Aluminium in Aqueous Sodium Oxalate and Sodium Sulphate Media." Rajshahi University Journal of Science 38 (October 10, 2013): 9–16. http://dx.doi.org/10.3329/rujs.v38i0.16544.

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An investigation was conducted on the anodisation of commercial grade aluminium in aqueous sodium sulphate and sodium oxalate solutions. The parameters investigated were anodisation potential and electrolyte composition. Degree of anodisation was evaluated by visual observation of the anodised surface, analyses of current-concentration graphs at constant potential and current-potential characteristics, and measurement of corrosion rate of the anodised surface. Anodisation potential played an important role on the degree of anodisation. The optimum potential was 400 mV and 800 mV wrt saturated Ag/AgCl (SSE) reference electrode for sodium sulphate and sodium oxalate solutions respectively. Below and above the optimum potential poor anodisation was due to insufficient production of Al3+ to form anodic film and surface breakdown respectively. Anodisation increased with the increase of oxalate concentration. Sulphate concentration was less effective on the degree of anodisation. Between the two electrolytes sodium oxalate was more suitable than sodium sulphate for aluminium anodisation. DOI: http://dx.doi.org/10.3329/rujs.v38i0.16544 Rajshahi University J. of Sci. 38, 09-16 (2010)

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Dass, G., and M. K. Kushwaha. "Nanoporous surface treatment of aluminium by anodisation in oxalic acid." Journal of Achievements in Materials and Manufacturing Engineering 1-2, no. 93 (March 1, 2019): 20–25. http://dx.doi.org/10.5604/01.3001.0013.4140.

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Purpose: Well-ordered nanoporous anodic surface on aluminium substrate was obtained by anodisation method in 0.3 M of oxalic acid as an electrolyte. The objective of this perusal is to describe a system for the magnifying diameter of pores and resistance of demolition of the oxide layer at various voltages. The effect of voltage and time of anodisation process in which obtaining the required structure in AAO film. Design/methodology/approach: The experiments have been performed on a setup for anodisation considering variables parameters. In this study, AAO Templates were prepared in oxalic acid of 0.3 M concentration under the potential range of anodisation 30-40 V at relatively temperatures range from 20-30°C of an electrolyte. Anodic voltage, current density and temperature of electrolyte were adopted as electrical parameters during anodisation. Before anodisation starts two crucial pre-treatment i.e. annealing and electropolishing are finished. Findings: The diameter of pores and pitch of pores are well-proportional to anodisation voltage and process time. The pore diameters were 85 nm, 138 nm, 184 nm, 248 nm with having 9, 16, 27, 37 porosity % respectively. The thickness of AAO film in all cases has been found to be maximum or constant after one hour in second step anodisation. The anodisation parameters like voltage, the time duration of the anodisation process and temperature are very essential features which influencing the fabrication of an AAO film. Research limitations/implications: The anodisation process is very easy to perform but very complex to understand as there are many parameters which may affect it. Practical implications: After that, the second step anodisation for the next half hour, there will be no change in the thickness of AAO film but after that dissolution rate starts over the formation rate and finally thickness will be decreasing. Originality/value: Therein is numerous macropores in the membrane with the size of pores variation from 163 to 248 nm. The diameter of pores, thickness, and pore density of AAO film was determined through Scanning Electron Microscopy (SEM), which exhibited that homogeneous honeycomb-like structure has appeared on the entire surface where anodisation performed precisely.

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Thongyoy, Sasitorn, and Areeya Aeimbhu. "Synthesis of Self-Aligned Titanium Oxide Nanotube Arrays in Ammonium Fluoride-Ethylene Glycol Electrolytes with Different Water Contents." Advanced Materials Research 463-464 (February 2012): 788–92. http://dx.doi.org/10.4028/www.scientific.net/amr.463-464.788.

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The aim of this research is to fabricate of TiO2nanotube arrays by potentiostatic anodisation process on titanium sheets. Anodisation is carried out under various applied potentials ranging from 20 to 30 volts for 1-3 hours at room temperature. Anodised were conducted in 1-4 wt% NH4F, water-based electrolyte and ethylene glycol-based electrolyte. The morphology of the anodised surfaces were characterised by scanning electron microscopy. When titanium sheets were anodised in various conditions, surface morphology of anodised titanium change remarkably with the changing of applied voltages, chemical composition of the electrolyte and anodisation time. The results of the present work show that the highly ordered and uniformly distributed TiO2nanotubes on titanium substrate can be fabricated by using mixtures of NH4F, ethylene glycol and water with appropriate conditions. Moreover, the anodisation potential and the water content play significant roles in the formation of TiO2nanotube with different inner tube diameters. The length of TiO2nanotube was controlled by anodisation time.

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Mahmud, Abdul Hadi, Anisah Shafiqah Habiballah, and A. M. M. Jani. "The Effect of Applied Voltage and Anodisation Time on Anodized Aluminum Oxide Nanostructures." Materials Science Forum 819 (June 2015): 103–8. http://dx.doi.org/10.4028/www.scientific.net/msf.819.103.

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The use of anodized aluminum oxide (AAO) is vastly being explored in recent years. The application includes molecular separation, sensing, energy storage and template synthesis for various nanostructures. The reason AAO is preferred was because of the ability to control the nanopore structure by manipulating some factors during the anodisation process. This study will investigate the exploitation of voltage and anodisation time during the anodisation process and the effect it has on the nanopore structure of the AAO by examining the structure under Field Emission Scanning Electron Microscope (FE-SEM). The experiment was carried out by anodizing aluminum foil in 0.3 M oxalic acid as electrolyte under the constant temperature of 5 °C. The applied voltage was varied from 40, 60 and 100 V with different anodisation time. The outcome of this study demonstrates that applied voltage has a proportional relationship with the developed pore size. Increasing the applied voltage from 40 to 100 V had increased the pore size of the AAO from 38 nm to 186 nm, respectively. Aluminium oxide anodized at 60 V demonstrates pore size in the range of 76 nm. Prolong anodisation time had improved the pore morphology of anodized aluminium oxide in the case of 40 V, however, the pore wall starts to collapse when anodisation time is more than 4 minutes at 100 V.

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Ringnalda, J., J. F. Zhang, S. Taylor, and D. M. Maher. "Microscopy of plasma anodised materials for VLSI." Proceedings, annual meeting, Electron Microscopy Society of America 48, no. 4 (August 1990): 632–33. http://dx.doi.org/10.1017/s0424820100176290.

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Plasma anodisation is an attractive technique for growing insulating layers of SiO2 at much lower temperatures then those needed for thermal oxide growth. Defects can be generated in silicon when it is subjected to prolonged high temperature oxidation processes, which in turn lead to degradation in both yield and performance of small geometry devices. An additional disadvantage of thermal oxide growth lies in the lateral oxidation behaviour (i.e. oxidation underneath the mask or ‘bird-beaking’ effect) which limits the minimum device separation which can be achieved. Although plasma anodisation has been widely investigated (see and references therein), previous studies have highlighted the severe difficulty of producing effective masks for this process, particularly during the high power anodisation studies which are the subject of this paper. Most of the established masks against thermal oxidation appear to be consumed during the plasma anodisation process. Therefore an important issue with regard to plasma anodisation is to find material systems in which the vertical oxidation rate of the mask is low compared to silicon and the lateral oxidation of both the mask and the silicon substrate under the mask are minimal. For the present study, two materials systems have been investigated; Si3N4/SiO2 strips on Si and Al/SiO2 strips on Si.

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Lim, Yingchin, Zulkarnain Zainal, Mohd Zobir Hussein, and Weetee Tan. "Morphology and Dimensions Controlled of Titania Nanotubes in Mixed Organic-Inorganic Electrolyte." Advanced Materials Research 686 (April 2013): 13–17. http://dx.doi.org/10.4028/www.scientific.net/amr.686.13.

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The formation of self-organized and highly ordered Titania nanotubes was achieved by anodisation of Ti in a mixture of water-ethylene glycol electrolyte. Control over the dimensions and morphology of nanotubes was successfully established by changing the anodisation voltage, the ammonium fluoride (NH4F) concentration and the anodisation time. A threshold voltage of 5 V is required for nanotube formation. Collapsed tubes were formed by applying electrochemical etching at high fluoride concentration. This study also showed that the nanotube lengths ranging from 0.5 to 2.6 μm could be formed by controlling the voltage applied and fluoride concentration with preferred growth along the c-axis.

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Asli, N. A., Mohamad Rusop, and Saifollah Abdullah. "Relation of Anodisation Parameter for Nanocrystallite Size of Porous Silicon Template Studied by Micro-Raman Spectroscopy." Advanced Materials Research 667 (March 2013): 324–28. http://dx.doi.org/10.4028/www.scientific.net/amr.667.324.

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Nanostructured porous silicon templates (NPSiT) were prepared by photo-electrochemical anodization of p-type crystalline silicon in HF electrolyte at different etching time. Two set anodisation parameter were observed, anodisation time nd current density applied. For set one, five samples were prepared with etching time varied from 10 to 50 minutes at 20 mA/cm2 of current density. For set two, five samples were prepared with current density varied from 5 to 40 mA/cm2 for 30 minutes. The effects of these anodisation parameter on NPSiT were observed based on nanocrystallite size. These studied was demonstrated by Raman spectroscopy. It was found that NPSiT sample with large pore diameter, which is smaller nanocrystallites size of Si between pore.

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Lockman, Zainovia, Syahriza Ismail, Go Kawamura, and Atsunori Matsuda. "Formation of Zirconia and Titania Nanotubes in Fluorine Contained Glycerol Electrochemical Bath." Defect and Diffusion Forum 312-315 (April 2011): 76–81. http://dx.doi.org/10.4028/www.scientific.net/ddf.312-315.76.

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The formation of self-aligned titania and zirconia nanotubes is achieved by the anodisation of Ti and Zr in a fluorine contained electrochemical bath. The anodic oxidation was performed at 30 V for 60 min in a two-electrode glycerol (15% water) bath containing varying amount of NH4F. Despite the fact that a self-aligned nanotubular structure is formed on both titanium and zirconium, the dimensions of zirconia and titania nanotubes are different under the same anodisation parameters. It appears that by using 30 V as the anodisation voltage, the diameter of zirconia nanotubes (30-60 nm) is much smaller compared to that of titania nanotubes (80-100 nm). The length of zirconia nanotubes in the bath consisting of 0.7 g NH4F is 3 µm whereas titania nanotubes formed in the same bath have a length of ~700 nm. The fundamental difference between the nanotubes formed on titanium and zirconium may be related to the rate of oxidation, initial oxide formation during anodisation, pits formation and rate of pits growth for pores formation and stabilisation. Moreover, investigation on the crystallinity of the nanotubes reveals that titania nanotubes are weakly crystalline with crystallite sizes of <5 nm. Whereas, zirconia nanotubes are much more crystalline in cubic modification. The stabilisation of the high temperature phase is thought to originate from the size of the nanotubes walls and the deficiency in oxygen during the growth of the anodic oxide by anodisation.

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Nickel, Daniela, Dagmar Dietrich, Roy Morgenstern, Ingolf Scharf, Harry Podlesak, and Thomas Lampke. "Anodisation of Aluminium Alloys by Micro-Capillary Technique as a Tool for Reliable, Cost-Efficient, and Quick Process Parameter Determination." Advances in Materials Science and Engineering 2016 (2016): 1–12. http://dx.doi.org/10.1155/2016/1374897.

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Anodisation is essential for improving surface properties of aluminium alloys and composites regarding wear and corrosion behaviour. Optimisation of the anodising process depends on microstructural constituents contained in aluminium alloys and represents a key task, consisting of the control of process parameters and electrolyte formulation. We applied the micro-capillary technique known from corrosion studies and modified it to form anodic aluminium oxide films on high-strength aluminium alloys in comparison to pure aluminium in sulphuric acid. A glass capillary with an opening of 800 μm in diameter was utilized. Corresponding electrochemical measurements during potentiodynamic and potentiostatic anodisation revealed anodic current responses similar to conventional anodisation. The measurement of film thickness was adapted to the thin anodised spots using ellipsometry and energy dispersive X-ray analysis. Cross sections prepared by focused ion beam milling confirm the thickness results and show the behaviour of intermetallic phases depending on the anodising potential. Consequently, micro-capillary anodising proved to be an effective tool for developing appropriate anodisation conditions for aluminium alloys and composites because it allows quick variation of electrolyte composition by applying low electrolyte volumes and rapid film formation due to short process durations at small areas and more flexible variation of process parameters due to the used set-up.

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Kok, Kuan Ying, Inn Khuan Ng, Nur Ubaidah Saidin, and Suhaila Hani Illias. "Preparation of Porous Alumina Template for Nanostructure Fabrication." Advanced Materials Research 895 (February 2014): 21–24. http://dx.doi.org/10.4028/www.scientific.net/amr.895.21.

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Porous alumina films are widely used as templates for fabricating one-dimensional (1-D) nanostructures such as nanowires or nanotubes. Using a two-step anodisation process, we have successfully optimized the growth conditions for fabricating highly ordered porous alumina films with pore diameters ranging from 20 to 150 nm, to be used as templates for 1-D nanostructure synthesis. The effects of the anodisation conditions on pore structure and the formation rate of the films were systematically studied. It was found that low electrolyte temperatures and agitations decreased the growth rate of the films but favored the process of pore ordering. Removal of oxide layer formed from first anodisation process and removal of barrier oxide at pore ends had an important bearing on pore morphology. Besides the stand-alone porous alumina films, we have also fabricated porous alumina films on rod-shaped Al substrates.

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Dissertations / Theses on the topic "Anodisation"

Ben, Romdhane Anas. "Anodisation multifonctionnelle d'alliages Al-Si." Electronic Thesis or Diss., Université de Lorraine, 2021. http://www.theses.fr/2021LORR0336.

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Les alliages aluminium-silicium de fonderie sont fréquemment utilisés pour la fabrication de pièces pouvant avoir des géométries complexes ayant des applications diverses (automobiles/ pistons/ électroménager). Suite à la préparation des échantillons par polissage mécanique, une couche d’oxyde poreuse de quinze microns est déposée à la surface de l’AS12 par anodisation en milieu acide ou basique. Après anodisation, un colmatage avec des acides carboxylique et phosphonique est effectué dans le but d’augmenter les performances mécaniques et anti-corrosion des échantillons anodisés. Afin d’évaluer les performances des couches élaborées plusieurs techniques de caractérisation ont été employées : la microscopie (MEB/ MET) pour l’analyse morphologique, les analyses EDS pour la composition, les mesures électrochimiques (SIE) et non électrochimiques au bouillard salin pour l’évaluation de la tenue à la corrosion et les tests tribologiques pour la caractérisation de la tenue à l’usure. À cause des fissures dues au silicium traversant la couche d’oxyde, les échantillons anodisés en milieu acide sulfurique ont montré une tenue à la corrosion réduite par rapport à ceux oxydés en milieu alcalin où le silicium est totalement oxydé en surface. Par contre, la taille nanométrique des pores issues de l’anodisation sulfurique offre une meilleure tenue à l’usure. Le colmatage des échantillons anodisés en milieu sulfurique mène au bouchage des fissures engendrées par le silicium métallique et par la suite à l’amélioration de la tenue à la corrosion. Néanmoins, vue la large taille des pores issus de l’anodisation en milieu alcalin, aucune amélioration significative au niveau de la tenue à la corrosion n’a été constatée. De point de vue tenue à l’usure, le colmatage n’apporte pas de valeur ajoutée remarquable aux échantillons anodisés
Aluminum-silicon alloys are widely used for the manufacture of parts with complex geometries for various applications (automotive / pistons / household appliances). Following the preparation of the samples by mechanical polishing, a porous oxide layer of fifteen microns is grown on the surface of the AS12 by anodization in acid or basic medium. After the anodization, a process known as sealing with long-chain carboxylic or phosphonic acids is carried out in order to increase the mechanical and anti-corrosion performances of the anodized samples. In order to evaluate the samples, several techniques were used: microscopy (SEM/ TEM) for morphological characterization, EDS analysis for composition, electrochemical (EIS) and non-electrochemical salt spray measurements for corrosion resistance evaluation and tribological tests for wear resistance characterization. Because of the cracks due to the silicon crossing the oxide layer, the samples anodized in sulfuric acid medium are characterized by a reduced corrosion resistance compared to those oxidized in alkaline medium where the silicon is completely oxidized on the surface. On the other hand, the nanometric size of the pores resulting from the sulfuric anodization offers a better resistance to wear. The sealing of the anodized samples in sulfuric medium leads to the plugging of the cracks generated by the metallic silicon and subsequently to the improvement of the corrosion resistance. However, due to the large size of the pores resulting from the anodization in alkaline medium, no significant improvement in the corrosion resistance is obtained. From the wear resistance point of view, the sealing does not bring any remarkable added value to the anodized samples

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Taylor, Stephen. "Plasma anodisation of silica for VLSI." Thesis, University of Liverpool, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.316570.

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Kennedy, Gary Paul. "Gate dielectrics for ULSI produced by plasma anodisation." Thesis, University of Liverpool, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.240311.

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Mathis, Aude. "Anodisation du titane par oxydation micro-arc (MAO)." Thesis, Université de Lorraine, 2016. http://www.theses.fr/2016LORR0303.

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Le présent travail de thèse a pour but le développement du procédé de traitement de surface d’anodisation micro-arc (MAO), appliqué au titane et alliage de titane. L’objectif est de déterminer l’influence des paramètres tels que la nature du substrat (éléments d’alliage), la chimie de la solution électrolytique et les paramètres électriques, sur le comportement électrochimique in-situ des couches en formation, ainsi que sur les caractéristiques microstructurales et chimiques des revêtements. Des méthodes de caractérisations notamment morphologiques (imagerie MEB et MET), chimiques (EDS, DRX, diffraction des électrons, EELS) et électrochimiques ex-situ (potentiel libre, courbes de polarisation, SIE) sont utilisées afin d’étudier les revêtements formés. L’étude systématique réalisée par voltampérométrie et chronopotentiométrie a permis de différencier trois stades ou régimes d’anodisation (I/ classique, II/ micro-arc, et III/ d’arcs), caractérisés par une réponse électrochimique particulière de l’interface métal/électrolyte, et qui impacte les propriétés de revêtement finalement obtenues. Des modèles phénoménologiques sont proposés aux différents stades d’anodisation et en lien avec les paramètres du traitement MAO. Le titane commercialement pur de Grade 2 et l’alliage de titane Ti-6Al-4V (ou TA6V) ont été étudiés comparativement ; l’influence des éléments d’alliage (aluminium et vanadium) a été discutée sur la conduite du procédé. L’élaboration d’une solution électrolytique a été étudiée dans le but d’obtenir un revêtement épais, compact et composé majoritairement de titanate d’aluminium. L’incorporation dans les revêtements des éléments provenant de l’électrolyte a été discutée en lien avec la réponse électrochimique ; cette étude conduit à une proposition de mécanisme de croissance de couche où interviennent les éléments du substrat et les éléments d’alliage aux différents stades d’anodisation. L’étude des régimes pulsés unipolaires et bipolaires a permis de discuter l’effet des temps de pause et des pulsations cathodiques sur la réponse électrochimique du matériau et sur les propriétés des revêtements. L’étude du ratio des charges anodiques / cathodiques a montré qu’il s’agissait d’un paramètre essentiel pour garantir la croissance d’un revêtement à la fois épais, homogène et compact
This thesis manuscript relates to the study of process set up of an electrochemical surface treatment, called micro-arc oxidation (MAO), and applied to titanium and its alloys. The aim is to determine the influence of parameters such as nature of the substrate (alloying elements), chemistry of the electrolytic solution and electrical parameters, on the process. In-situ electrochemical behaviour of forming oxide layers is studied, as well as microstructural and chemical characteristics of formed coatings. Many methods mostly to characterize morphology (SEM, TEM imagery), chemistry (EDS, XRD, electron diffraction, EELS) and ex- situ electrochemical behaviour (OCP, polarizing, EIS) are used. Systematic study realised by voltamperometry and chronopotentiometry allowed to differentiate three anodizing stages (I/ conventional, II/ micro-arc, III/ of arcs), characterized by a particular electrochemical response of the metal/electrolyte interface, and which impacts obtained coating properties. Phenomenological models are proposed for each stage of anodizing and linked to MAO process parameters. Grade 2 commercially pure titanium and alloy Ti-6Al-4V (or TA6V) are comparatively studied; the influence of alloying elements (aluminium and vanadium) was discussed in relation with running of the process. Development of an electrolytic solution was carried out to obtain a thick and compact coating, mostly composed of aluminium titanate. Incorporation into the coating of elements from the electrolyte was discussed, and linked to in-situ electrochemical response; this study leaded to a proposed coating growth mechanism which involves elements from the substrate and from the electrolyte. Study of unipolar and bipolar pulsed regimes allowed discussing the effect of pause time and cathodic pulses on electrochemical response of the material and on coating properties. Study of the anodic / cathodic charge ratio showed it was an essential parameter to ensure growth of a thick, homogeneous and compact coating

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Bowen, Andrew. "Anodisation and study of oxide films formed on zirconium." Thesis, University of Nottingham, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.328407.

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Cicutto, Ludovic. "Élaboration innovante et anodisation locale de microélectrodes en aluminium." Thesis, Toulouse 3, 2020. http://www.theses.fr/2020TOU30320.

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L'anodisation de l'aluminium est un traitement de surface connu et étudié depuis près d'un siècle. Toutefois, de façon surprenante, très peu de travaux ont concerné l'anodisation locale de l'aluminium, c'est-à-dire sur des surfaces inférieures au mm². Le premier but de ce travail a consisté à fabriquer des microélectrodes unitaires en aluminium, ce qui n'avait jamais été réalisé auparavant. Des essais ont été réalisés selon trois approches d'élaboration, à savoir la fusion du métal, l'étirage simultané et l'enrobage du fil conducteur. Au final, un protocole expérimental maîtrisé, répétable et innovant permet à présent la fabrication de microélectrodes d'aluminium 1050 de type disque-plan dont la surface active constitue un disque de 125 µm de diamètre, et le Rg, c'est-à-dire le rapport entre le diamètre total de l'électrode et le diamètre du métal, variant entre 2,5 et 9,5. Le deuxième objectif résidait dans l'anodisation de ces microélectrodes d'aluminium, en étudiant dans ce cas l'influence de différents paramètres opératoires clés (tension, composition de l'électrolyte et sa température) sur les caractéristiques des films anodiques. Les résultats ont d'une part confirmée des évolutions "classiques" de la porosité ou du diamètre des pores, mais ont d'autre part révélé des vitesses de croissance atypiques, associées spécifiquement à l'échelle microscopique. Le troisième et dernier challenge visait à tester la faisabilité d'élaborer un réseau de nanoélectrodes métalliques à l'intérieur des pores des films anodiques élaborés précédemment à l'extrémité des microélectrodes. Dans cette optique, différentes expérimentations ont été menées afin de réduire la couche barrière et limiter la réduction de l'eau, en vue d'électrodéposer du nickel métal dans la porosité. Au final, les présents travaux constituent l'initiation d'une voie d'élaboration prometteuse vers une nouvelle génération potentielle de capteurs tirant parti des propriétés d'un réseau d'ultramicroélectrodes ayant chacune la dimension d'un pore unitaire, soit un diamètre de 100 nm
Aluminum anodizing is a surface treatment that has been known and studied for nearly a century. However, in a surprising manner, very few works have been published about the local anodizing of aluminum, meaning on surfaces lower than a mm². The primary goal of this work consisted in fabricating unitary aluminum microelectrodes, which has never been reported. Tests have been carried out using three different approaches, that is using melted aluminum, the simultaneous pulling of a glass capillary, and the coating of a conducting wire. Ultimately, a controlled experimental procedure, repeatable and innovative, now allows the manufacturing of disk-shaped aluminum 1050 microelectrodes, the active surface of which is a 125 µm diameter disk and the Rg, which is the electrode total diameter on the metal diameter ratio, varying between 2,5 and 9,5. The second objective lied in the anodizing of these aluminum microelectrodes, while studying in this case the role of different key operating parameters (voltage, nature of the electrolyte and its temperature) on the anodic film characteristics. The results have, for one part, confirmed the "standard" evolution of the porosity and the pores diameter, but for the other part have also revealed extraordinary growth speed of the anodic film, which has specifically been associated with the microscopic scale. The third and last challenge was to test the possibility of elaborating a metal nanoelectrode array inside the pores of the anodic films previously achieved at the tip of the microelectrodes. In this context, various experiments have been carried out to thin the barrier layer and restrict the reduction of water with the idea of electrodepositing metallic nickel in the porous film. Finally, the present work represents the first step to a promising way of elaborating a potential new generation of sensors using the properties of an ultramicroelectrodes array, every single one of which having the dimension of a single pore, with a diameter of 100 nm

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Tshaka, Anele. "Synthesis of One-Dimensional TiO2 Nanotube Arrays by Potentiostatic Anodisation." University of the Western Cape, 2017. http://hdl.handle.net/11394/6198.

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Magister Scientiae - MSc (Microbiology)
TiO2 nanomaterials, in particular nanotubes, are some of the most studied materials, as they are considerably important in technological and biological applications due to their unique electronic properties and biocompatibility. For example, vertically aligned TiO2 nanotubes play a crucial role in photovoltaics as they enhance the charge separation as a result of their excellent photo-catalytic properties in the presence of organic dye molecules, and provide a superior one-dimensional transport route compared to nanoparticle films. There are numerous techniques used to synthesise TiO2 nanotubes, such as chemical vapor deposition (CVD), template based techniques, anodisation, to name but a few. However, due to its non-toxicity environmental friendliness and cost-effectiveness, anodisation is the most common technique to synthesise TiO2 nanotubes. In addition anodisation allows for control over the morphology when tailoring the anodisation parameters such as voltage, concentration, temperature and duration. It is well-documented that the as-synthesised TiO2 nanotubes via anodisation technique are amorphous and require post-treatment at elevated temperature (above 280 degrees C) to induce crystallinity into anatase phase. Further increase in annealing temperature results in crystallisation in either rutile or mixed phase structure.

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Gasco, Owens Ana Sofía. "Anodisation pulsée de l’aluminium en milieu sulfurique : mécanismes et applications." Electronic Thesis or Diss., Université de Lorraine, 2023. http://www.theses.fr/2023LORR0025.

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Les procédés d’anodisation pulsée/cyclique sont de plus en plus attrayants depuis un certain temps, principalement parce qu’avec cette technologie, il est possible de créer des couches poreuses d’oxyde d’aluminium anodique (AAO) avec une morphologie adaptée. Malheureusement, la conception de ces signaux des pulsations complexes reste empirique en raison du manque de connaissances de base sur les mécanismes se produisant au cours des processus. Les travaux présentés visent à faire la lumière sur cette question, en gardant à l’esprit que ces informations pourraient être utilisées pour prédire et concevoir de nouvelles nanostructures ainsi que pour optimiser le processus lui-même. A cette fin, cette recherche combine des mesures électrochimiques in situ (polarisation, SIE, OCP) avec des observations morphologiques ex situ (FE-MEB, imagerie METB) pour identifier les mécanismes impliqués lors d’ : (i) une diminution de potentiel du domaine anodique jusqu’à la limite du domaine cathodique (balayage potentiodynamique inverse) sur Al pré-anodisé, (ii) un procédé d’anodisation par pulses bipolaires sur Al, et (iii) un procédé d’anodisation par pulses unipolaires sur Al pur et sur AA2024. En outre, un signal de pulse bipolaire est conçu pour obtenir un AAO avec un aspect blanc caractérisé par spectrophotométrie, et un signal de pulsation unipolaire pour anodiser avec un taux de croissance élevé sans endommager l’intégrité de la couche anodique par le phénomène de combustion
Pulse/cyclic anodizing processes have been gaining attraction for some time now, mainly because, with this technology, it is possible to create porous anodic aluminum oxide (AAO) layers with a tailored morphology. Unfortunately, the design of these complex pulse signals remains empirical due to the lack of basic knowledge of the mechanisms occurring during the processes. The presented work aims to shed some light on that matter, keeping in mind that this information could be used to predict and design new nanostructures as well as to optimize the process itself. To this end, this research combines in situ electrochemical measurements (polarizing, EIS, OCP) with ex situ morphological observations (FE-SEM, STEM) to identify the mechanisms occurring throughout: (i) a decrease of potential from the anodic domain to the limit of the cathodic one (reverse scan polarization) of a classic-anodized Al, (ii) a bipolar pulse anodizing process on Al, and (iii) a unipolar pulse anodizing process on pure Al and on AA2024. Additionally, a bipolar pulse signal is designed to obtain an AAO with a white aspect characterized by spectrophotometry, and a unipolar pulse signal to anodize with a high growth rate without damaging the integrity of the anodic layer through the burning phenomenon

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Chalier, Florence. "Synthèse, caractérisation et étude de l'oxydation anodique de nouvelles triarylphosphines hétérosubstituées." Aix-Marseille 3, 1992. http://www.theses.fr/1992AIX3A016.

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Capek, David. "Contribution à l'étude de l'oxydation anodique du titane en milieu sulfurique." Besançon, 2005. http://www.theses.fr/2005BESA2077.

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Cette thèse décrit le comportement électrochimique (anodique) d'un titane commercialement pur associé à des observations physiques de surface. Des études chrono-ampérométriques ont révélé une augmentation de la densité de courant attribuée `a la création de fissures dans la couche d'oxyde. Ce phénomène est confirmé par plusieurs techniques spectroscopiques (impédance électrochimique) et microscopiques (microscopies optique, électronique à balayage, à force atomique). Les travaux menés, au potentiel libre, sur différentes surfaces ayant subis des modifications variées permettent de mieux comprendre la complexité du système. Sur la base de ces différents résultats obtenus durant cette recherche, une nouvelle hypothèse sur l'anodisation potentiostatique de longue durée est proposée
This thesis describes the electrochemical behaviour of commercial pure titanium together with observed physical response of the surface. Long-time chrono-amperometric investigations reveal a local increase in current density which is attributed to creation of cracks in anodic oxide film. This phenomenon is confirmed by several techniques (optical microscopy, SEM, AFM, EIS). Measurement of an open circuit potential of various surface modifications under different conditions helps to understand the total complexity of the system. On the basis of the presented research a new hypothesis on a long-time potentiometric anodisation is formed

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Book chapters on the topic "Anodisation"

Rajaraman, R., Padma Gopalan, B. S. Panigrahi, and M. Premila. "Anodisation Time Dependence of Photoluminescence Properties of Porous Silicon." In Frontiers in Materials Modelling and Design, 257–60. Berlin, Heidelberg: Springer Berlin Heidelberg, 1998. http://dx.doi.org/10.1007/978-3-642-80478-6_27.

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Cere, Silvia, Andrea Gomez Sanchez, and Josefina Ballarre. "Anodisation and Sol–Gel Coatings as Surface Modification to Promote Osseointegration in Metallic Prosthesis." In Modern Aspects of Electrochemistry, 197–265. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-31849-3_3.

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Ivanda, M., M. Balarin, O. Gamulin, V. Đerek, D. Ristić, S. Musić, M. Ristić, and M. Kosović. "Porous Silicon by Galvanostatic Electrochemical Anodisation of Epitaxial Silicon, Polycrystalline Silicon and Silicon on Insulator Layers." In NATO Science for Peace and Security Series B: Physics and Biophysics, 303–20. Dordrecht: Springer Netherlands, 2013. http://dx.doi.org/10.1007/978-94-007-7003-4_28.

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"Nucleation and Crystal Shape Engineering." In Nanoscopic Materials: Size-Dependent Phenomena and Growth Principles, 262–95. 2nd ed. The Royal Society of Chemistry, 2014. http://dx.doi.org/10.1039/bk9781849739078-00262.

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Given the dominance of surface energy, small crystallites are disfavoured relative to larger crystallites, and nucleation has to overcome an energy barrier before the volume energy starts to drive crystal growth. Small particles are formed under conditions of high oversaturation because this triggers instant formation of many nuclei and homogeneous growth, until after a short time span growth stops simultaneously for all of them, owing to starvation. Equilibrium crystal shapes are determined by Wulff's law, but inhibition due to selective adsorption or liquid layer formation at the different crystal facets leads to different growth rates and to very different morphologies at the same crystal structures. Thus, crystal shape engineering is the art of handling non-equilibrium conditions and kinetic rather than thermodynamic control, with temperature and degree of oversaturation being the major parameters. Liquid droplets can act as collectors of materials from the gas phase, catalysing unidirectional growth of needle-type structures or carbon nanotubes. Growth rate and shape can also be influenced electrochemically, and densely packed layers of oriented metal oxide nanotubes can be grown by anodisation of the metal foils.

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DeRose, J. A., I. De Graeve, A. Bałkowiec, J. Michalski, T. Suter, K. J. Kurzydlowski, P. Schmutz, and H. Terryn. "Effect of Surface Treatment, Anodisation, and Inhibitors on Corrosion of the Aluminium Alloy AA2024." In Aluminium Alloy Corrosion of Aircraft Structures, 147–65. WIT Press, 2012. http://dx.doi.org/10.2495/978-1-84564-752-0/09.

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"Properties of oxide coatings deposited on a plastic substrate by a successive pulsed plasma anodisation process." In Adhesion Aspects of Thin Films, Volume 1, 215–24. CRC Press, 2014. http://dx.doi.org/10.1201/b11971-34.

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Conference papers on the topic "Anodisation"

"Anodisation of Gridded Silicon Field Emitter Arrays." In 10th International Conference on Vacuum Microelectronics. IEEE, 1997. http://dx.doi.org/10.1109/ivmc.1997.627394.

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Sreekantan, S., L. M. Hung, Z. Lockman, Z. A. Ahmad, A. F. Mohd Noor, Abarrul Ikram, Agus Purwanto, et al. "The Synthesis and Characterization of Titania Nanotubes Formed at Various Anodisation Time." In NEUTRON AND X-RAY SCATTERING 2007: The International Conference. AIP, 2008. http://dx.doi.org/10.1063/1.2906053.

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Zubaidah, M. Ain, N. A. Asli, M. Rusop, and S. Abdullah. "Photoluminescence of porous silicon nanostructures with optimum current density of photo-electrochemical anodisation." In 2012 10th IEEE International Conference on Semiconductor Electronics (ICSE). IEEE, 2012. http://dx.doi.org/10.1109/smelec.2012.6417099.

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Husak, Yevheniia, Vladlens Grebnevs, Sahin Altundal, Alicja Kazek-Kesik, Anna Yanovska, Artur Maciej, Oleksii Gudakov, et al. "Effect Of CaP-particles on Ceramic-like Coatings Formed on Magnesium via Anodisation." In 2022 IEEE 12th International Conference Nanomaterials: Applications & Properties (NAP). IEEE, 2022. http://dx.doi.org/10.1109/nap55339.2022.9934636.

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Zubaidah, M. Ain, N. Asli, M. Rusop, and S. Abdullah. "Electroluminescence properties of porous silicon nanostructures with optimum current density of photo-electrochemical anodisation." In 2012 IEEE Symposium on Business, Engineering and Industrial Applications (ISBEIA). IEEE, 2012. http://dx.doi.org/10.1109/isbeia.2012.6422878.

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Lockman, Z., Srimala Sreekantan, Syahriza Ismail, Mohamad Rusop, and Tetsuo Soga. "Control Over the Growth of Titania Nanotubes by Anodisation of TI Foil in NH[sub 4]F-Containing Electrolyte." In NANOSCIENCE AND NANOTECHNOLOGY: International Conference on Nanoscience and Nanotechnology—2008. AIP, 2009. http://dx.doi.org/10.1063/1.3160168.

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