THE EFFECT OF ALUMINUM ELECTROPOLISHING ON NANO-PORES ARRANGEMENT IN ANODIC ALUMINA MEMBRANES

Surface conditions of aluminum can influence the final arrangement of nano-pores in fabrication of ordered nanoporous anodic alumina membranes (AAMs). This study is mainly focused on the different applied voltages of aluminum electropolishing by keeping all the other parameters constant. After heat treatment (stress relieving and annealing at 500°C) of pure aluminum sheets, the samples were electropolished at different voltages (10-60V) to obtain desirable surface smoothness, while the temperature of the container was kept constant. The current-time curves were recorded during electropolishing process. The surface roughness obtained in each applied voltage was examined using optical microscope and atomic force microscope (AFM). The process was followed by two-step anodization in order to reach ordered nano-pores. Finally, the influence of surface roughness on regularity of nano-pores was observed using scanning electron microscope (SEM). The SEM images were analyzed to investigate the morphology and the degree of self ordering of pores of the samples by using a new designed analytical method aiming MATLAB and fast Fourier transform (FFT) technique. It was concluded that the electropolishing voltage and the resulted surface roughness and also formed defects can competitively affect the arrangement of membrane's nano-pores. A desired smoothness obtained from electropolishing voltage of 30V. Also 40V provided the best order with respect to the other voltages.

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Metallographic effects of pure aluminum on properties of nanoporous anodic alumina (NPAA)

Surface and Interface Analysis ◽

10.1002/sia.5285 ◽

2013 ◽

Vol 45 (10) ◽

pp. 1490-1496 ◽

Cited By ~ 17

Author(s):

Fereshteh Rashidi ◽

Tatsuya Masuda ◽

Hidetaka Asoh ◽

Sachiko Ono

Keyword(s):

Pure Aluminum ◽

Anodic Alumina ◽

Nanoporous Anodic Alumina

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Wafer-level thin film vacuum packages for MEMS using nanoporous anodic alumina membranes

2011 16th International Solid-State Sensors, Actuators and Microsystems Conference ◽

10.1109/transducers.2011.5969507 ◽

2011 ◽

Cited By ~ 4

Author(s):

J. Zekry ◽

D.S. Tezcan ◽

J.-P. Celis ◽

R. Puers ◽

C. Van Hoof ◽

...

Keyword(s):

Thin Film ◽

Anodic Alumina ◽

Wafer Level ◽

Nanoporous Anodic Alumina ◽

Alumina Membranes

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Enhancement of Surface Roughness and Growth Morphology of Nanoporous Anodic Alumina from Commercially Aluminum Alloy 1050 Using Two-Step Electrochemical Polishing

Journal of The Electrochemical Society ◽

10.1149/2.1051810jes ◽

2018 ◽

Vol 165 (10) ◽

pp. E498-E503 ◽

Cited By ~ 1

Author(s):

C. K. Chung ◽

C. H. Tsai ◽

Z. W. Wang

Keyword(s):

Surface Roughness ◽

Aluminum Alloy ◽

Anodic Alumina ◽

Electrochemical Polishing ◽

Growth Morphology ◽

Nanoporous Anodic Alumina

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Ionic transport across tailored nanoporous anodic alumina membranes

Journal of Colloid and Interface Science ◽

10.1016/j.jcis.2012.02.066 ◽

2012 ◽

Vol 376 (1) ◽

pp. 40-46 ◽

Cited By ~ 19

Author(s):

V. Romero ◽

V. Vega ◽

J. García ◽

V.M. Prida ◽

B. Hernando ◽

...

Keyword(s):

Ionic Transport ◽

Anodic Alumina ◽

Nanoporous Anodic Alumina ◽

Alumina Membranes

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Preparation and Characterization of Anodic Alumina Membrane with Nanopore Arrays

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.549.358 ◽

2012 ◽

Vol 549 ◽

pp. 358-361

Author(s):

Xiao Hong Tang ◽

Wen Bin Yang ◽

Ya Fei Cheng ◽

Quan Guo Huang

Keyword(s):

Photoelectron Spectroscopy ◽

Pure Aluminum ◽

Aluminum Foil ◽

Honeycomb Structure ◽

Anodic Alumina ◽

Alumina Membrane ◽

Energy Dispersion Spectroscopy ◽

X Ray ◽

Alumina Membranes ◽

Nanopore Arrays

Anodic alumina membranes (AAM) with nanopore arrays were prepared by one-step anodization of highly pure aluminum foil. Morphology, structure and composition of AAM were characterized by scanning electron microscopy (SEM), energy dispersion spectroscopy (EDS), X-ray photoelectron spectroscopy (XPS) and X-ray diffraction (XRD). Results showed that AAM owned honeycomb structure which was characterized by close-packed arrays of columnar hexagonal cells, each containing a central pore normal to the substrate. The diameter of pores and the size of cells changed under different anodic conditions, such as temperature, concentration of H2C2O4 solution, voltage and time of anodization. The walls of AAM were composed of two strains of nanoparticles of alumina. Furthermore, the chemical composition of AAM was found to be amorphous alumina. The prepared AAM with nanopore arrays is a kind of ideal template for preparation of many one-dimensional nanomaterials.

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Evaluation of Finishing/Polishing Techniques on Low-Shrink Posterior Restorative After Mechanical Cycling

Journal of Health Sciences ◽

10.17921/2447-8938.2019v21n1p46-50 ◽

2019 ◽

Vol 21 (1) ◽

pp. 46

Author(s):

Públio Juliana do Carmo ◽

Lúcia Trazzi Prieto ◽

Cíntia Tereza Pimenta Araújo ◽

Josué Junior Araujo Pierote ◽

Débora Alves Nunes Leite Lima ◽

...

Keyword(s):

Surface Roughness ◽

Surface Properties ◽

Composite Resin ◽

Composite Resins ◽

The Other ◽

Sem Images ◽

Mechanical Cycling ◽

Significant Difference ◽

Em 12 ◽

Posterior Restorations

O objetivo deste estudo foi avaliar a rugosidade superficial de resinas compostas à base silorano e metacrilato submetidas a diferentes técnicas de acabamento/polimento. Foram preparadas 12 amostras de disco de cada resina composta: P90®, Z350® e Carisma, divididas em 12 grupos de acordo com a técnica de acabamento / polimento: sem acabamento / polimento (controle); acabamento com ponta diamantada 1112 FF; acabamento com ponta diamantada 1112 FF associada a Enhance / Pogo; acabamento com ponta diamantada 1112 FF associada a Enhance / Pogo / Polishing / Pastas Poli I e II / Fotogloss. Após as leituras iniciais da rugosidade da superfície, os espécimes foram submetidos a ciclos mecânicos (1.200.000 ciclos) e submetidos imediatamente a leituras de rugosidade final. As medias de rugosidade superfícial foram analisadas estatisticamente por ANOVA e teste de Tukey-Kramer (α = 0,05). As imagens de MEV foram realizadas após o acabamento / polimento e após a ciclagem mecânica. O compósito P90 mostrou valores de rugosidade superficial semelhantes a outros compósitos investigados. Tough, mostrou diferença significativa nas técnicas de acabamento / polimento. O grupo de pontas damantadas apresentou maior rugosidade superficial que diferiu das outras resinas compostas (α <0,05). Enance / Pogo mostrou os menores resultados, que não apresentaram diferença em relação ao grupo de pasta de polimento (α> 0,05). O material restaurador posterior de baixa contração apresentou rugosidade superficial semelhante quando comparado as resinas compostas de dimetacrilato e são restaurações adequadas para região posterior.Palavras-chave: Dente. Resinas de Silorano. Propriedades de Superfície. AbstractThe aim of this study was to evaluate the surface roughness of a silorane and methacrylate-based composite resins subjected to different finishing/polishing techniques. Twelve disk specimens were prepared from each composite resin: P90®, Z350® and Charisma, divided into 12 groups according to the finishing/polishing technique: no finishing/polishing (control); finishing with 1112 FF diamond burs; finishing with 1112 FF diamond burs associated to Enhance/Pogo; finishing with 1112 FF diamond burs associated to Enhance/Pogo/Polishing/Poli I and II pastes/Fotogloss. After initial readouts of surface roughness, the specimens were subjected to mechanical cycling (1.200.000 cycles) and immediately subjected to final roughness readouts. Surface roughness means was statistically analyzed by ANOVA and Tukey-Kramer test (α=0.05). SEM images were realized after finishing/polishing and after mechanical cycling. The P90 composite showed surface roughness values similar to other investigated composites. However, significant difference was observed in finishing/polishing techniques. The diamond burs group showed the highest surface roughness differing from the other composite resins (α < 0.05). Enance/Pogo showed the lowest results, which presented no difference compared to the polishing paste group (α > 0.05). The low-shrink posterior restorative showed similar surface roughness when compared to dimethacrylate composite resins and suitable to posterior restorations. Keywords: Tooth. Silorane Resins. Surface Properties.

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