Growth and Characterization of a Porous Aluminum Oxide Film Formed on an Electrically Insulating Support

Miney, Paul G.; Colavita, Paula E.; Schiza, Maria V.; Priore, Ryan J.; Haibach, Frederick G.; Myrick, Michael L.

doi:10.1149/1.1602332

Cited by 50 publications

(55 citation statements)

References 21 publications

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“…Figure 3 shows the SEM images of the aluminum oxide structure from a study of aluminum oxide growth and characterization. In order to view aluminum oxide film thickness by the SEM photograph, it was done using aluminum purity 99.99% that was produced using magnetron sputtering [20]. However, for the current research, we are using industrial standard aluminum tube A6063 that has the purity of 97.5%.…”

Section: Experimental Methods and Conditionsmentioning

confidence: 99%

Development of a New Internal Finishing of Tube by Magnetic Abrasive Finishing Process Combined with Electrochemical Machining

Ridha

Zou²,

Sugiyama³

2015

IJMEA

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Abstract:The research proposes a new internal surface magnetic abrasive finishing (MAF) process, which compounded with electrochemical machining (ECM) to decrease machining time. The electrochemical process changes the morphology of the aluminum tube internal surface, producing an oxidation film. Then, we removed the film by magnetic abrasive finishing, results in minimized surface roughness in a significantly reduced processing time when compared to the conventional MAF. In this research, a new experimental set up with a tool that capable of magnetic abrasive finishing and electrochemical finishing was designed and developed to study the machining feasibility. The newly developed finishing method demonstrated simultaneous process of aluminum oxide film formation by ECM and its removal by MAF. This process plays a significant role in preventing the deepening of the pit during ECM and speed up the planarization. The method was developed step by step; firstly, ECM and MAF were conducted in two separate processes. In the second experiment, we modified the finishing conditions to facilitate one-stage finishing method. An investigation of the finishing surface is focusing on the pit size that formed by ECM. The pit size indicated the residue of oxide film because it is a part of the oxidation film construction. Pits morphology changes were observed for certain finishing time to determine the minimum finishing time for its removal. Surface roughness and SEM photograph of the finishing surface were recorded and studied.

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Section: Experimental Methods and Conditionsmentioning

confidence: 99%

Development of a New Internal Finishing of Tube by Magnetic Abrasive Finishing Process Combined with Electrochemical Machining

Ridha

Zou²,

Sugiyama³

2015

IJMEA

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“…A 500 nm aluminum film was sputtered onto a plain float glass slide (75 Â 25 Â 0.5 mm), anodized and subsequently converted to porous alumina as described previously [18,19]. The resulting 750 nm thick transparent alumina film was subsequently coated for 210 s with gold using a CRC-100 sputtering system (Plasma Sciences Inc., Lorton, VA), producing a gold film approximately 100 nm thick.…”

Section: Ortle Design and Conceptmentioning

confidence: 99%

“…We recently reported a study of the anodization of aluminum thin films sputtered onto an electrically insulating substrate ± a plain float glass microscope slide [18]. The resulting porous aluminum oxide (alumina) films are transparent and contain pores varying from approximately 80 to 100 nm in diameter.…”

Section: Introductionmentioning

confidence: 99%

“…For this reason, the electrode is called an optically reflective thin layer electrode (ORTLE) in the following discussion. This new electrode is based on the porous alumina thin films in [18]. In the case of the ORTLE, spectroscopy interrogates a solution phase within the pores of the alumina film between the electrode face and a window behind it.…”

Section: Introductionmentioning

confidence: 99%

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A New Optically Reflective Thin Layer Electrode (ORTLE) Window: Gold on a Thin Porous Alumina Film Used to Observe the Onset of Water Reduction

2004

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The fabrication and unique characteristics of a new type of thin layer electrode, an optically reflective thin layer electrode (ORTLE), are described. The electrode was fabricated by the anodization of a thin layer of aluminum sputtered onto a plain glass microscope slide to create a 750 nm-thick porous alumina film. A thin film of gold was then sputtered atop the porous and transparent alumina film. The gold layer remained porous to allow solution into the pores but was optically thick and reflective. Reflectance measurements made through the microscope slide did not interrogate the bulk solution, but show spectral features that shift with the optical properties of the material filling the pores of the alumina film. A simple series of experiments, in which the potential of the ORTLE was stepped negatively to various values in an aqueous sodium sulfate solution, shows that interference fringes shift measurably in the ORTLE spectrum at potentials several hundred millivolts positive of the potential at which gas evolution was visible to the naked eye.

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“…La γ-alúmina es uno de los materiales cerámicos mesoporosos más importante y ampliamente utilizado en HDS [10][11][12], debido a que posee alta área específica, sitios ácidos de Brönsted y Lewis, y excelente distribución de volumen y tamaño de poros [13][14][15][16][17][18][19]. Estudios recientes, han demostrado que por medio de la inserción de átomos como el cerio (Ce) en el soporte del catalizador modifica sus características fisicoquímicas, dando lugar a mejoras en las propiedades catalíticas (actividad, estabilidad térmica y tiempo vida útil) [20,21].…”

Section: Introductionunclassified

Influencia del Ce en la hidrodesulfuración de tiofeno utilizando precursores catalíticos de heteropolioxomolibdatos de níquel tipo Anderson soportados sobre alúmina/Influence of Ce in the thiophene hydrodesulfurization using catalytic precursor of alumina

2017

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RESUMENEl efecto del soporte modificado con cerio en precursores catalíticos de NiMo tipo Anderson sobre la hidrodesulfuración de tiofeno fue investigada. Los sólidos fueron caracterizados por área específica (S BET ), difracción de rayos X (DRX) y espectroscopía infrarroja (FTIR). El soporte modificado con cerio se impregnó con una solución acuosa del heteropolioxomolibdato tipo Anderson de Ni. La presencia de (NH 4 ) 4 [NiMo 6 O 24 H 6 ]•5H 2 O y alúmina en fases gamma y gibbsita se verificó por DRX, mientras que el FTIR permitió asignar las características vibracionales de la estructura tipo Anderson, debido a los estiramientos y flexiones de los grupos funcionales presentes. Los soportes γ-Al 2 O 3 , γ-Al 2 O 3 -Ce y Ce/γ-Al 2 O 3 mostraron mayor área específica (149-66 m 2 /g) que los precursores catalíticos NiMo 6 /γ-Al 2 O 3 , NiMo 6 /γ-Al 2 O 3 -Ce y NiMo 6 -Ce/ γ-Al 2 O 3 (76-36 m 2 /g). Los catalizadores provenientes de alúminas modificadas con cerio presentaron mayor actividad HDS que los obtenidos con alúmina no modificada, lo cual está asociado a la formación de mayor número de sitios activos.Palabras clave: Cerio; Soporte modificado; Heteropolioxomolibdato tipo Anderson; Hidrodesulfuración de tiofeno. ABSTRACTThe effect of the support modified with cerium in alumina supported Anderson type NiMo catalytic precursors on thiophene hydrodesulfurization (HDS) was investigated. The solids were characterized by surface area (S BET ), X-ray diffraction (XRD) and infrared spectroscopy (FTIR). The support catalytic modified with cerium by one-pot and impregnation methods were impregnated with an aqueous solution of nickel Anderson type heteropolyoxomolybdate. The presence of (NH 4 ) 4 [NiMo 6 O 24 H 6 ]•5H 2 O and alumina gibbsite or gamma phases was verified by XRD, whereas FTIR analysis could be assigned to the characteristic vibrations of Andersontype structure due to stretching and bending of the functional groups present. The γ-Al 2 O 3 , γ-Al 2 O 3 -Ce and Ce/γ-Al 2 O 3 supports showed higher values of surface area (149-66 m 2 /g) than the NiMo6/γ-Al 2 O 3 , NiMo 6 / γ-Al2O3-Ce and NiMo 6 -Ce/γ-Al 2 O 3 catalytic precursors (76-36 m 2 /g). The catalysts derived from ceriummodified alumina showed higher HDS activity than those obtained from unmodified alumina, which was associated with the formation of the largest number of active sites. Influencia del Ce en la hidrodesulfuración de tiofeno utilizando precursores catalíticos de heteropolioxomolibdatos de níquel tipo Anderson soportados sobre alúmina

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Growth and Characterization of a Porous Aluminum Oxide Film Formed on an Electrically Insulating Support

Cited by 50 publications

References 21 publications

Development of a New Internal Finishing of Tube by Magnetic Abrasive Finishing Process Combined with Electrochemical Machining

Development of a New Internal Finishing of Tube by Magnetic Abrasive Finishing Process Combined with Electrochemical Machining

A New Optically Reflective Thin Layer Electrode (ORTLE) Window: Gold on a Thin Porous Alumina Film Used to Observe the Onset of Water Reduction

Influencia del Ce en la hidrodesulfuración de tiofeno utilizando precursores catalíticos de heteropolioxomolibdatos de níquel tipo Anderson soportados sobre alúmina/Influence of Ce in the thiophene hydrodesulfurization using catalytic precursor of alumina

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