Growth of Porous Anodic Films on Zirconium and Zirconium Alloys in Glycerol/fluoride Electrolytes PDF Download
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Author: Francesca Muratore
Publisher:
ISBN:
Category :
Languages : en
Pages : 254
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Book Description
Author: Francesca Muratore
Publisher:
ISBN:
Category :
Languages : en
Pages : 254
Get Book Here
Book Description
Author: Francesca Muratore
Publisher:
ISBN:
Category :
Languages : en
Pages : 254
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Book Description
Author: P. Schmuki
Publisher: The Electrochemical Society
ISBN: 156677649X
Category : Science
Languages : en
Pages : 438
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Book Description
This is a special issue of ECS Transactions published by ECS in memory of Volker Lehmann and Vitali Parkhutik, two key scientists in the field of porous semiconductors who recently passed away. Topics in this issue aim at a more detailed understanding of growth mechanisms and the physical and chemical properties of all types of porous semiconductors. The papers address research in the various sub-fields of porous semiconductors such as semiconductor electrochemistry, deposition into pores, matrix materials, optical spectroscopy and transdisciplinary approaches to the topic as well as work relevant to the formation of advanced materials such as, for example, porous silicon, matrix composites and nanoclusters and their applications such as chemical and biological sensors.
Author: Grzegorz D. Sulka
Publisher: Elsevier
ISBN: 0128167068
Category : Technology & Engineering
Languages : en
Pages : 482
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Book Description
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
Author: B. Cox
Publisher:
ISBN:
Category :
Languages : en
Pages : 0
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Author: Mario Maraghini
Publisher:
ISBN:
Category : Oxidation
Languages : en
Pages : 64
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Author: George Baker Adams
Publisher:
ISBN:
Category : Electrolytic oxidation
Languages : en
Pages : 26
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Author:
Publisher:
ISBN:
Category : America
Languages : en
Pages : 132
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Author: R. D. Misch
Publisher:
ISBN:
Category : Metals
Languages : en
Pages : 32
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Book Description
Zirconium anodizes similarly to tungsten in respect to the change of interference colors with applied voltage. However, the oxide layer on tungsten cannot reach as great a thickness. Hafnium does not anodize in the same way as zirconium but is similar to tantalum. By measuring the interference color and capacitative thicknesses on zirconium (Grades I and III) and a 2.5 wt.% tin alloy, the film was found to grow less rapidly in terms of capacitance than in terms of interference colors. This was interpreted to mean that cracks develop in the oxide as it thickens. The effect was most pronounced on Grade III zirconium and least pronounced on the tin alloy. The reduction in capacitative thickness was especially noticeable when white oxide appeared. Comparative measurements on Grade I zirconium and 2.5 wt.% tin alloy indicated that the thickness of the oxide film on the tin alloy (after 16 hours in water) increased more rapidly with temperature than the film on zirconium. Tin is believed to act in ways to counteract the tendency of the oxide to form cracks, and to produce vacancies which promote ionic diffusion.
Author: B. Cox
Publisher:
ISBN:
Category : Irradiation effects
Languages : en
Pages : 21
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Book Description
The linear growth of relatively thick (>300 nm) interference-colored oxide films on zirconium alloy specimens exposed in the Advanced Test Reactor (ATR) coolant at ?55°C was unexpected. Initial ideas were that this was a photoconduction effect. Experiments to study photoconduction in thin anodic zirconium oxide (ZrO2) films in the laboratory were initiated to provide background data. It was found that, in the laboratory, provided a high electric field was maintained across the oxide during ultraviolet (UV) irradiation, enhanced growth of oxide occurred in the irradiated area. Similarly enhanced growth could be obtained on thin thermally formed oxide films that were immersed in an electrolyte with a high electric field superimposed. This enhanced growth was found to be caused by the development of porosity in the barrier oxide layer by an enhanced local dissolution and reprecipitation process during UV irradiation. Similar porosity was observed in the oxide films on the ATR specimens. Since it is not thought that a high electric field could have been present in this instance, localized dissolution of fast-neutron primary recoil tracks may be the operative mechanism. In all instances, the specimens attempt to maintain the normal barrier-layer oxide thickness, which causes the additional oxide growth. Similar mechanisms may have operated during the formation of thick loosely adherent, porous oxides in homogeneous reactor solutions under irradiation, and may be the cause of enhanced oxidation of zirconium alloys in high-temperature water-cooled reactors in some water chemistries.
