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Artículos de revistas sobre el tema "Anodized Alumina"

Autor: Grafiati
Publicado: 4 de junio de 2021
Última modificación: 1 de febrero de 2022

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1

Voon, Chun Hong, Mohd Nazree Derman, Kai Loong Foo, M. Nuzaihan y Uda Hashim. "Fast Fourier Transform Analysis of Images of Scanning Electron Microscope of Porous Anodic Alumina". Advanced Materials Research 1109 (junio de 2015): 69–72. http://dx.doi.org/10.4028/www.scientific.net/amr.1109.69.

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In this study, Fast Fourier Transform (FFT) analysis was conducted on the images of scanning electron microscope of morphology of the porous anodic alumina formed on high purity aluminium. High purity aluminium substrates were anodized at 50 V in 0.3 M oxalic acid of 15°C for 60 minutes. As anodized porous anodic alumina were then subjected to oxide dissolution treatment of increasing exposure duration, up to three minutes. Micrographs were captured by using scanning electron microscope and the images were analyzed using FFT. It was found that the FFT images of as anodized porous anodic alumina and porous anodic alumina subjected to oxide dissolution treatment up to two minutes were similar, which were disc shaped white forms, indicating no ordered periodic structures were formed. When porous anodic alumina subjected to oxide dissolution treatment for three minutes, FFT image showed six distinct spots at the edges of a hexagon, indicating a perfect hexagonal pore arrangement was obtained for porous anodic alumina subjected to oxide dissolution treatment for three minutes.
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2

LU, ZHIXIANG. "COAXIAL NANOTUBES FROM POLY(ETHYL 2-CYANOACRYLATE)/POLY(p-XYLYLENE) CONFORMAL COATINGS VIA VAPOR DEPOSITION". Nano 05, n.º 03 (junio de 2010): 149–60. http://dx.doi.org/10.1142/s1793292010002050.

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Ultra-thin (10–100 nm) conformal coatings of poly(ethyl 2-cyanoacrylate) and poly(p-xylylene) have been synthesized via vapor deposition in the confined nanochannels of anodized alumina membranes. Poly(ethyl 2-cyanoacrylate) nanotubes and coaxial poly(ethyl 2-cyanoacrylate)/poly(p-xylylene) nanotubes with precisely-controlled wall thickness were obtained after the removal of the inorganic anodized alumina membrane. Platinum nanoparticles have also been deposited in the coaxial nanotubes via supercritical carbon dioxide.
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3

Voon, Chun Hong, Mohd Nazree Derman, U. Hashim, Bee Ying Lim y Sung Ting Sam. "Oxide Dissolution Treatment of Porous Anodic Alumina". Advanced Materials Research 1109 (junio de 2015): 73–77. http://dx.doi.org/10.4028/www.scientific.net/amr.1109.73.

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In this study, oxide dissolution treatment was used for the formation of well ordered porous anodic alumina. Porous anodic alumina was formed on mechanically polished high purity aluminium by anodizing at 50 V in 0.3 M oxalic acid of 15°C for 60 minutes. It is observed that the pore arrangement of as anodized porous anodic alumina was randomly distributed and showed no ordered hexagonal cell structure. As anodized porous anodic alumina were then subjected to oxide dissolution treatment of increasing exposure duration, up to three minutes. Micrographs were captured by using scanning electron microscope. Pore arrangement of porous anodic alumina subjected to oxide dissolution treatment up to two minutes were similar to one another where no ordered periodic structures were formed. .When porous anodic alumina subjected to oxide dissolution treatment for three minutes, a perfect hexagonal pore arrangement was obtained.
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4

Saito, M., M. Kirihara, T. Taniguchi y M. Miyagi. "Micropolarizer made of the anodized alumina film". Applied Physics Letters 55, n.º 7 (14 de agosto de 1989): 607–9. http://dx.doi.org/10.1063/1.101572.

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5

Cui, Meifang, Fang Wang, Zhihui Miao, Yong Xia, Liqiang Yan, Yun Ma, Hongtao Yao, Huanhuan Ling y Zhengjian Qi. "Self-assembly oxygen sensing thin film based on a Ru(ii) complex covalently grafted to porous anodized alumina oxide (AAO) templates". RSC Advances 5, n.º 80 (2015): 65627–34. http://dx.doi.org/10.1039/c5ra07809a.

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6

Klakurková, Lenka, Eduard Hégr, Ladislav Čelko, Tomáš Podrábský, Martin Juliš, Michaela Remešová y Jiří Švejcar. "Comparative Analysis of Hard Anodized Layer on Aluminium Alloy". Materials Science Forum 782 (abril de 2014): 615–18. http://dx.doi.org/10.4028/www.scientific.net/msf.782.615.

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Hard anodized layers were produced by two different manufacturers on the same type of aluminium alloy on a vacuum pump part of complex shape. The sulphuric acid/water solution was used to produce alumina layers, which were subsequently sealed in demineralized water. A comparative analysis based on metallographic methodology, with the aim to control the stability of alumina formation process and to identify its defects, was performed by means of light and scanning electron microscopy, surface profilometry and microhardness measurements. To determine the thickness of alumina layers, the image analysis was also used.
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7

Voon, Chun Hong, Mohd Nazree Derman, U. Hashim, Kai Loong Foo y Seng Teik Ten. "Synthesis of Porous Anodic Alumina on Aluminium Manganese Alloys". Advanced Materials Research 1109 (junio de 2015): 78–82. http://dx.doi.org/10.4028/www.scientific.net/amr.1109.78.

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In this study, porous anodic alumina was formed on aluminium alloy substrate with increasing manganese content, from high purity aluminium with 0 wt% Mn to aluminium alloy with 2.0 wt% manganese by anodizing. Substrates were anodized at 50 V in 0.3 M oxalic acid of 15°C for 60 minutes. Images from the optical microscope revealed that no secondary phase existed in high purity aluminium and aluminium substrate with 0.5 wt% manganese while two phases were observed when the manganese contents were higher than 0.5 wt%. Element dispersive X ray spectroscopy spot analysis suggested that the secondary phase consists of both aluminium and manganese. Well ordered porous anodic alumina was obtained on high purity aluminium and aluminium substrate with 0.5 wt% manganese while pore arrangement of porous anodic alumina was significant disturbed when aluminium alloys with manganese contents higher than 0.5 wt% were anodized.
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8

Jaroonpak, Ekarach, Porntawee Terawan, Naruemon Wannawong, Arkom Kaewrawang, Chaiyaput Kruehong y Mallika Thabuth. "The Synthesis of Nano-Porous Alumina by Anodization Process". Applied Mechanics and Materials 781 (agosto de 2015): 235–38. http://dx.doi.org/10.4028/www.scientific.net/amm.781.235.

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The porous alumina templates were synthesized by anodization process. For preparation, the aluminum foils were cleaned by acetone acid and ethanol. After that, cleaned foils were firstly anodized by oxalic acid with direct current (DC) voltage source. When the first anodization process was complete, the aluminum foils were etched by chromic and phosphoric acid for an hour and then they were secondarily anodized for 15 min to increase the pore depth. For characterization, the surface morphology of porous alumina on aluminum surface was evaluated by scanning electron microscope. The results show that the pore diameter increases with increasing DC voltage and concentration of oxalic acid. The lowest pore diameter is 57.19 nm at DC voltage of 20 V for concentration of 0.2 M that it has highest pores density of 157 Gpores/in2.
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9

Santecchia, Eleonora, Marcello Cabibbo, Abdel Magid S. Hamouda, Farayi Musharavati, Anton Popelka y Stefano Spigarelli. "Friction and Wear Response of a Hard-Anodized AA6082". Materials Science Forum 1016 (enero de 2021): 1235–39. http://dx.doi.org/10.4028/www.scientific.net/msf.1016.1235.

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The properties of anodized aluminum, and wear resistance in particular, are of high interest for the scientific community. In this study, discs of AA6082 were subjected to a peculiar hard anodizing process leading to anodized samples having different thicknesses. In order to investigate the wear mechanism of samples, unidirectional tribological tests were performed against alumina balls (corundum) under different loading conditions. Surface and microstructure of all the samples were characterized before and after the tribological tests, using different characterization techniques. The tribological tests showed remarkable differences in the friction coefficient and wear behavior of the anodized AA6082 samples, related to the microstructure modifications and to the specific applied sliding conditions.
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10

Ibrayev, N. Kh. "FEATURES OF STIMULATED EMISSION OF A MEROCYANINE DYE IN THE PORES OF ANODIZED ALUMINUM". Eurasian Physical Technical Journal 18, n.º 2 (11 de junio de 2021): 29–34. http://dx.doi.org/10.31489/2021no2/29-34.

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The results of the study of the spectral-luminescent properties and the generation of stimulated emission of merocyanine dye molecules in a porous aluminum oxide films are presented. The addition of silver nanoparticles to the porous aluminum oxide films leads to an increase in the absorption cross section and an increase in the quantum yield of dye fluorescence in the alumina films. However, in the alumina films with silver nanoparticles, the generation of stimulated emission of dye molecules was not detected. We also studied the effect of polymethyl methacrylate polymer deposited on the surface of the alumina films with a dye on the spectral-luminescent properties and generation of stimulated emission of this dye. An increase in the optical density in the absorption band of the dye and an increase in the fluorescence intensity in samples with a deposited polymethyl methacrylate film are observed. The generation threshold of polymethine dye is reduced by a factor of 40 in the porous aluminum oxide sample with polymethyl methacrylate.
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11

Dass, Ghanshyam, Anil Kumar y Manoj Kumar Kushwaha. "Renovate Tribological Properties of Nanostructured Alumina Templates by Diverse Electrolytes". Advanced Science, Engineering and Medicine 12, n.º 6 (1 de junio de 2020): 806–9. http://dx.doi.org/10.1166/asem.2020.2619.

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Friction and wear properties of NAAO templates were calculated in affinity to pore dimensions and applied load. Homogeneously uniformly decorative synthesized by anodization of nanoporous aluminium oxide films having 65–95 μm thick and pores of 143.5, 105, 84.4 nm diameter. A tribological competency of the material checked out with loads and 250 rpm on the pin on a dry wear disc. The anodized NAAO sample has wear resistance increased by 25% as compared to the non-anodized sample. The pore density little bit impressed the frictional characters of NAAO template. We counsel that these course templates basically contribute to the reduction of friction distrait the pore structure by proving energy-dispersive spectroscopy (EDS).
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12

Li, Jing, Qiang Li, Jin Kai Xu y Hua Dong Yu. "Effects of Process Parameters on Hydrophobicity of Alumina Surfaces Fabricated by Hard Anodizing". Advanced Materials Research 884-885 (enero de 2014): 64–67. http://dx.doi.org/10.4028/www.scientific.net/amr.884-885.64.

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In the present article, hard anodizing technique was used to prepare alumina films on aluminum alloy substrate. The change of the water contact angles on the surface of the as-anodized samples with the hard anodizing process parameters was studied. The wettability of the alumina films was reinforced by means of controlling the surface microstructure. The rough structures can trap a large amount of air and minimize the real contact area between surfaces and water droplets. The measurement of the wetting property showed that the water contact angle of the as-anodized samples increases from 82° to 130° with adjusting hard anodizing process parameters. In a word, the rough structure on the surface prepared by adjusting hard anodizing process parameters plays a vital role in the constructing of the stable hydrophobic surface on aluminum alloy.
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13

Chang, Huey Ling, Chih Ming Chen, Chin Huang Sun y Jin Shyong Lin. "Investigation of the Preparation of Anodized Nanoporous Alumina Array". Advanced Materials Research 887-888 (febrero de 2014): 766–69. http://dx.doi.org/10.4028/www.scientific.net/amr.887-888.766.

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This study produced a regularly arranged membrane, called anodic aluminum oxide (referred AAO), by mean of anodic oxidation treatment. The structure of AAO can be molecular self-assembly and its pore size is consistent. Also, the manufacturing process cost is low. These properties make the AAO be a nanotemplate material. This study further created a high quality of nanostructured film by electrochemical mould with the design of electrolyzer. In addition, a uniform nanothin film was grown on the aluminum surface in the stable control of current and temperature according to the conditions of different anode treatment. This film can form a nanopore array which the diameter can be controlled the size ranging from 15 nm to 400 nm. As results, the study can produce nanoporous template for various aperture by mean of anodic oxidation.
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14

Yamamoto, Nobuo, Tomiharu Yamaguchi y Kazuhiro Hara. "Development of QCM Humidity Sensors Using Anodized Alumina Film". IEEJ Transactions on Sensors and Micromachines 139, n.º 9 (1 de septiembre de 2019): 296–302. http://dx.doi.org/10.1541/ieejsmas.139.296.

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15

Stasi, V., G. Cattaneo, S. Franz, M. Bestetti, M. C. Ubaldi, D. Piccinin y S. M. Pietralunga. "Aluminium pre-patterning for highly ordered nanoporous anodized alumina". Photonics and Nanostructures - Fundamentals and Applications 5, n.º 2-3 (octubre de 2007): 136–39. http://dx.doi.org/10.1016/j.photonics.2007.07.009.

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16

Matijošius, Tadas, Alma Ručinskienė, Algirdas Selskis, Giedrius Stalnionis, Konstantinas Leinartas y Svajus J. Asadauskas. "Friction reduction by nanothin titanium layers on anodized alumina". Surface and Coatings Technology 307 (diciembre de 2016): 610–21. http://dx.doi.org/10.1016/j.surfcoat.2016.09.083.

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17

Saito, Mitsunori y Mitsunobu Miyagi. "Anisotropic optical loss and birefringence of anodized alumina film". Journal of the Optical Society of America A 6, n.º 12 (1 de diciembre de 1989): 1895. http://dx.doi.org/10.1364/josaa.6.001895.

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18

Huang, Li-Feng, Mitsunori Saito y Mitsunobu Miyagi. "Polarization Characteristics of Alumina Films Anodized at Low Temperature". Japanese Journal of Applied Physics 32, Part 1, No. 7 (15 de julio de 1993): 3169–74. http://dx.doi.org/10.1143/jjap.32.3169.

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19

Oh, Jihun y Carl V. Thompson. "Selective Barrier Perforation in Porous Alumina Anodized on Substrates". Advanced Materials 20, n.º 7 (4 de abril de 2008): 1368–72. http://dx.doi.org/10.1002/adma.200701719.

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20

Yamamoto, Nobuo, Tomiharu Yamaguchi y Kazuhiro Hara. "Development of QCM humidity sensors using anodized alumina film". Electronics and Communications in Japan 102, n.º 11 (30 de octubre de 2019): 39–46. http://dx.doi.org/10.1002/ecj.12218.

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21

Wardhani, Sri, Danar Purwonugroho, Deka Permatasari y Darjito Darjito. "The Effect of Acidity and Aging Time in The Synthesis of Al(OH)3 from The Anodized-waste with a Sol-Gel Method". Journal of Pure and Applied Chemistry Research 8, n.º 3 (1 de diciembre de 2019): 232–38. http://dx.doi.org/10.21776/ub.jpacr.2019.008.03.477.

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Synthesis of alumina has been carried out by utilizing anodized waste as raw material. Anodized waste is a by-product of metal anodizing processes such as aluminium. This study aims to determine the effect of acidity (pH) and aging time on the mass of Al(OH)3 and the property of Al(OH)3 as well as Al2O3 that produced. Anodized waste was deposited into Al(OH)3 and then purified. Alumina synthesized by the sol-gel method with pH variations of 7, 8, 9, and 10 and aging times of 24, 48, and 72 hours. The Al(OH)3, which has been produced, was characterized by PSA and powder XRD spectrophotometer. The results showed that the synthesis of Al(OH)3 was influenced by pH and aging time. It affects the yield and particle size of Al(OH)3. The optimum condition of the synthesis was pH 7 and aging time of 24 hours with yield of 1.85 grams. Characterization by PSA at a current diameter of 90% indicate that higher pH value and longer aging time produces smaller particle size. Characterization by powder XRD shows that the Al(OH)3 has gibbsite crystal phase with d values of 3.360, 3.217, 2.252, 2.029, and 1.649 Å.
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22

He, Chun Lin y Qing Kui Cai. "Effect of Current Density on Morphology and Corrosion Resistance of Anodized Coating on SiCp/2024 Al Composite". Materials Science Forum 546-549 (mayo de 2007): 661–66. http://dx.doi.org/10.4028/www.scientific.net/msf.546-549.661.

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The effects of current densities on the morphology and corrosion resistance of anodized coating formed on a SiCp/2024 Al metal matrix composite (MMC) in sulfuric acid solution were investigated by scanning electron microscopy (SEM), energy dispersive spectrometry (EDS) and polarization curve. The results showed that the surface of the coating was not flat, and cracks existed when the current density increased to 20mA/cm2. The SiC particles could be oxidized during anodizing of the MMC. And the SiC particle anodized at a significantly reduced rate compared with the adjacent Al matrix. This gave rise to alumina film encroachment beneath the particle and occlusion of the partly anodized particle in the coating. As a consequence, the oxide/substrate interface became locally scalloped, and the anodized coating was non-uniform in thickness. Further, oxidation of SiC appeared to be associated with gas-filled cavities in the coating material. The size of cavities above the SiC particles increased obviously and the surface cracks developed when the current density increased. This shows that the anodized coating formed at higher current density has a structural feature with lower corrosion resistance. The polarization results indicated that the corrosion resistance of the coating decreases when the current density increases.
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23

Park, Sung, Seunggyu Han, Jae Hyeok Kim, Sang Heon Lee y Sumin Choi. "Immobilization of Photocatalytic ZnO Nanopowders Using Anodized Nanoporous Alumina Substrates". Journal of Nanoscience and Nanotechnology 20, n.º 11 (1 de noviembre de 2020): 6850–54. http://dx.doi.org/10.1166/jnn.2020.18779.

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Nanoporous Al2O3 substrates with an average pore size of about 150 nm were prepared via anodization of Aluminum plates. Depending on the anodization condition, the surface area of the anodized Al2O3 was increased more than six-fold. Solution-combusted ZnO nanopowders were prepared as a function of fuel/oxidant ratios. At a fuel/oxidant ratio of 0.8, ZnO powder showed excellent powder characteristics such as average particle sizes of 30 nm and spherical shape. Electrical properties of SCM ZnO nanopowders with different fuel/oxidant ratios were investigated by Hall measurement. The carrier concentration of SCM ZnO nanopowders at the fuel/oxidant ratio of 0.8, was the highest, three-fold higher than that of any commercial ZnO powders. Using spray coating, these nanopowders were coated onto Al2O3 substrates for immobilization. To evaluate the photo-catalytic effect, Ag ions were removed from the wastewater via photocatalysis. The photocatalytic efficiency with the SCM ZnO nanopowders on nanoporous Al2O3 substrates was 2.5-fold higher than that with the SCM ZnO nanopowders on normal Al2O3 substrates. However, commercial zinc oxide powders did not show any photocatalytic phenomena. The large difference in photocatalytic efficiency was probably attributed to the characteristics of SCM ZnO nanopowder and the large surface area of anodized Al2O3.
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24

MURATA, Kyu y Hideo KAMEYAMA. "Preparation of the Anodized Alumina Layer as a Catalyst Material." Journal of the Surface Finishing Society of Japan 47, n.º 2 (1996): 173–77. http://dx.doi.org/10.4139/sfj.47.173.

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25

Chaturvedi, Pavan, Stacy D. Rodriguez, Ivan Vlassiouk, Immo A. Hansen y Sergei N. Smirnov. "Simple and Versatile Detection of Viruses Using Anodized Alumina Membranes". ACS Sensors 1, n.º 5 (9 de marzo de 2016): 488–92. http://dx.doi.org/10.1021/acssensors.6b00003.

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26

Altuntas, Sevde, Fatih Buyukserin, Ali Haider, Buket Altinok, Necmi Biyikli y Belma Aslim. "Protein-releasing conductive anodized alumina membranes for nerve-interface materials". Materials Science and Engineering: C 67 (octubre de 2016): 590–98. http://dx.doi.org/10.1016/j.msec.2016.05.084.

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27

Rahman, M. Tofizur, Nazmun Nahar Shams, Yun-Chung Wu, Chih-Huang Lai y Dieter Suess. "Magnetic multilayers on porous anodized alumina for percolated perpendicular media". Applied Physics Letters 91, n.º 13 (24 de septiembre de 2007): 132505. http://dx.doi.org/10.1063/1.2790788.

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28

Sriram, Ganesan, Pravin Patil, Mahesh P. Bhat, Raveendra M. Hegde, Kanalli V. Ajeya, Iranna Udachyan, M. B. Bhavya et al. "Current Trends in Nanoporous Anodized Alumina Platforms for Biosensing Applications". Journal of Nanomaterials 2016 (2016): 1–24. http://dx.doi.org/10.1155/2016/1753574.

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Pristine aluminum (Al) has received great deal of attention on fabrication of nanoporous anodized alumina (NAA) with arrays of nanosized uniform pores with controllable pore sizes and lengths by the anodization process. There are many applications of NAA in the field of biosensors due to its numerous key factors such as ease of fabrication, high surface area, chemical stability and detection of biomolecules through bioconjugation of active molecules, its rapidness, and real-time monitoring. Herein, we reviewed the recent trends on the fabrication of NAA for high sensitive biosensor platforms like bare sensors, gold coated sensors, multilayer sensors, and microfluidic device supported sensors for the detection of various biomolecules. In addition, we have discussed the future prospectus about the improvement of NAA based biosensors for the detection of biomolecules.
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29

Suwa, Yuji, Mikio Kumita, Ryotaro Noki, Akio Kodama y Yoshio Otani. "Water Vapor Sorption Characteristics of Calcium Chloride-Anodized Alumina Composites". Journal of Chemical Engineering of Japan 49, n.º 3 (2016): 274–79. http://dx.doi.org/10.1252/jcej.14we286.

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30

Okano, Mamoru, Mitsunori Saito y Mitsunobu Miyagi. "Polarization characteristics of alumina films anodized with large current density". Electronics and Communications in Japan (Part II: Electronics) 74, n.º 5 (1991): 101–7. http://dx.doi.org/10.1002/ecjb.4420740511.

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31

Pardo-Saavedra, D. C., C. L. Londoño-Calderón, S. Menchaca-Nal, L. G. Pampillo, R. Martínez García y L. M. Socolovsky. "MORFOLOGICAL STUDY OF PORE WIDENING PROCESS IN ANODIZED ALUMINA FILMS". Anales AFA 25, n.º 2 (19 de septiembre de 2014): 68–71. http://dx.doi.org/10.31527/analesafa.2014.25.2.68.

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32

Saito, Mitsunori y Mitsunobu Miyagi. "Micropolarizer using anodized alumina with implanted metallic columns: theoretical analysis". Applied Optics 28, n.º 16 (15 de agosto de 1989): 3529. http://dx.doi.org/10.1364/ao.28.003529.

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33

Okano, Mamoru, Toshimitsu Taniguchi, Mitsunori Saito y Mitsunobu Miyagi. "Residual aluminum and its dichroism in anodized alumina thin films". Optics Letters 15, n.º 5 (1 de marzo de 1990): 253. http://dx.doi.org/10.1364/ol.15.000253.

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34

Kushwaha, M. K., Anjan Sil y S. Ray. "Carbon Nanotube/Nanofiber Embedded Nanoporous Anodized Aluminium Oxide Surface and Its Tribological Properties". Journal of Nanoscience and Nanotechnology 8, n.º 8 (1 de agosto de 2008): 4152–58. http://dx.doi.org/10.1166/jnn.2008.an01.

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Nanoporous alumina has been prepared by anodization of pure aluminium using phosphoric acid electrolyte. Carbon nanotubes/nanofibres (CNTs/CNFs) are grown within the pores by chemical vapour deposition technique, using acetylene gas as carbon precursor. Such synthesis of nanostructured carbonaceous materials within the nanoporous oxide template has high potential for many applications (e.g., electronics, magnetic, etc.) in nanotechnology. Possibility of using such material combination for engineering systems where abrasion resistance coupled with self-lubrication (at comparatively higher loads) are the key requirements, has been explored through the present work. Pore structure has been characterized by SEM/FE-SEM in this study and CNTs/CNFs have been examined by TEM, FE-SEM and Raman spectroscopy. While the pore diameters are found to lie in the range of 180–220 nm, the CNTs/CNFs diameter are observed to be in the range of 50 to 220 nm. The CNTs/CNFs growing from bottom of the pores are found to replicate the pore diameter, while those grown above the surface are varying significantly in diameter and probably matching the diameter of the catalyst, which remains adsorbed on the top surface and inner walls of the pores. On comparing friction and wear properties of both materials (viz. anodized alumina and CNTs/CNFs embedded anodized alumina) as determined by pin-on–disc machine using hardened steel disc as counterface, it is found that wear rate and coefficient of friction of CNTs embedded composite surface is significantly lower which is attributed to formation of transfer layer of hard wear resistant alumina mechanically mixed with graphitic CNTs/CNFs.
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35

Kollie, T. G., T. D. Radcliff y F. J. Weaver. "Emittance of Boehmite and Alumina Films on 6061 Aluminum Alloy Between 295 and 773 K". Journal of Heat Transfer 113, n.º 1 (1 de febrero de 1991): 185–89. http://dx.doi.org/10.1115/1.2910523.

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The total hemispherical emittance of an oxide film that formed on 6061-T6 aluminum alloy parts in the Tower Shielding Reactor-II at Oak Ridge National Laboratory was measured from 295 to 773 K using an emissometer and/or a calorimeter. The emittance of this film was critically needed for heat transfer calculations in a simulated loss-of-coolant accident of the reactor. X-ray diffraction analysis identified the film as boehmite (Al2O3·H2O), which dehydrated to alumina (Al2O3) upon heating above 473 K. The measured emittances for the alumina film are in excellent agreement with published values for anodized aluminum films and for bulk alumina. Published values of the emittance of boehmite could not be found for comparison, but evidence is presented that some anodization processes for aluminum yield boehmite and not alumina films.
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36

MURATA, Kyu y Hideo KAMEYAMA. "Effectiveness Factor of Pt/Alumina Plate Type Catalysts Using Anodized Alumina Layer as Catalyst Support." Journal of the Surface Finishing Society of Japan 47, n.º 8 (1996): 720–24. http://dx.doi.org/10.4139/sfj.47.720.

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37

Nurrudin, Ahmad, Brian Yuliarto, Suyatman y Agung Sriwongo. "Formation of Porous Anodic Alumina from Impure Aluminum Foil in Inorganic Acids". Advanced Materials Research 1112 (julio de 2015): 89–93. http://dx.doi.org/10.4028/www.scientific.net/amr.1112.89.

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The morphology of porous anodic alumina (PAA) formed by anodizing in inorganic electrolytes is reported. An impure aluminum was anodized in sulfuric acid, phosphoric acid and chromic acidat room temperature with a constant applied potential 2 – 30 V. The formation of porous anodic alumina was carried out by one and two steps anodization. It is clearly noted that anodizing impure aluminum at room temperature provide higher kinetic of oxide dissolution compared to oxide growth. Two steps anodizing aluminum in sulfate electrolyte always resulted in random porous alumina, while phosphate electrolyte provided strong anodization producing irregular porous alumina with average diameter of 61.6 nm. Two steps anodizing aluminum in chromate electrolyte produce better pore ordering with relatively large size pore distributions. The average pore diameter of alumina increases linearly with applied voltage, with proportionality factor lp 0.83 nmV-1. Annealing the sample increased the interpore distance, removed stresses providing lower activation energy for pore formation.
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38

Voon, Chun Hong, Bee Ying Lim, K. L. Foo, Uda Hashim, Sung Ting Sam, Mohd Khairuddin Md Arshad y A. F. Baharuddin. "Effect of Concentration of Oxalic Acid on the Synthesis of Porous Anodic Alumina (PAA) on Aluminum Alloy AA6061". Materials Science Forum 857 (mayo de 2016): 281–85. http://dx.doi.org/10.4028/www.scientific.net/msf.857.281.

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In this study, porous anodic alumina was formed by anodizing of aluminum alloy AA6061 in oxalic acid with concentration ranged from 0.1 M to 1.0 M respectively. AA6061 alloys were anodized at 40 V and 25°C for 60 minutes. FESEM images show that the uniformity of the pores arrangement of porous anodic alumina depends significantly on the concentration of oxalic acid. Well-ordered porous anodic alumina was formed in oxalic acid of 0.3 M, 0.5 M and 0.7 M while disordered porous anodic alumina were formed when the oxalic acid of 0.1 M and 1.0 M were used as electrolytes. EDX analysis revealed that the only peaks corresponding to aluminum and oxygen were detected. Pore size was found to increase with the concentration of oxalic acid while the interpore distance remained almost unchanged although the concentration of oxalic acid increased from 0.1 M to 0.7 M. Atypical anodic alumina without pores arrangement was formed when 1.0 M oxalic acid was used for anodizing.
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39

Kynclová, Hana, Jiří Smilek, Petr Sedlacek, Jan Prášek, Martina Klučáková y Jaromir Hubálek. "Preparation and Utilization of Alumina Oxide Membranes for Sensor Devices". Materials Science Forum 851 (abril de 2016): 159–64. http://dx.doi.org/10.4028/www.scientific.net/msf.851.159.

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This work describes preparation process of free-standing alumina membranes used in sensor devices for separation or purification (increased selectivity, and sensitivity) purposes. Nanoporous alumina membranes were prepared using anodic oxidation of aluminium foil in two types of acidic electrolytes and characterized using scanning electron microscopy. Membranes with pore diameters of 90 nm and 30 nm and thicknesses of 115 µm and 163 µm respectively were obtained. Fabrication of membranes with different post-treatment was also done. In this post-treatment process, etching of non-anodized aluminium and opening of barrier layer were replaced with application of reversible potential with equal magnitude as anodization voltage.
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40

Rihui He y Chang-Jin Kim. "Low-Temperature Monolithic Encapsulation Using Porous-Alumina Shell Anodized on Chip". Journal of Microelectromechanical Systems 18, n.º 3 (junio de 2009): 588–96. http://dx.doi.org/10.1109/jmems.2009.2017088.

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41

Kimpton, D. G. y J. G. Swanson. "The Formation of Plasma Anodized Alumina Films on In0.53Ga0.47As Device Structures". Journal of The Electrochemical Society 138, n.º 7 (1 de julio de 1991): 2129–34. http://dx.doi.org/10.1149/1.2085937.

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42

Jin, Chunming, Sudhakar Nori, Wei Wei, Ravi Aggarwal, Dhananjay Kumar y Roger J. Narayan. "Pulsed Laser Deposition of Nanoporous Cobalt Thin Films". Journal of Nanoscience and Nanotechnology 8, n.º 11 (1 de noviembre de 2008): 6043–47. http://dx.doi.org/10.1166/jnn.2008.483.

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Nanoporous cobalt thin films were deposited on anodized aluminum oxide (AAO) membranes at room temperature using pulsed laser deposition. Scanning electron microscopy demonstrated that the nanoporous cobalt thin films retained the monodisperse pore size and high porosity of the anodized aluminum oxide substrates. Temperature- and field-dependent magnetic data obtained between 10 K and 350 K showed large hysteresis behavior in these materials. The increase of coercivity values was larger for nanoporous cobalt thin films than for multilayered cobalt/alumina thin films. The average diameter of the cobalt nanograins in the nanoporous cobalt thin films was estimated to be ∼5 nm for blocking temperatures near room temperature. These results suggest that pulsed laser deposition may be used to fabricate nanoporous magnetic materials with unusual properties for biosensing, drug delivery, data storage, and other technological applications.
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43

Voon, Chun Hong, Bee Ying Lim, K. L. Foo, Uda Hashim, Sung Ting Sam, Mohd Khairuddin Md Arshad y N. A. I. Mustafa. "Synthesis of Porous Anodic Alumina (PAA) on Aluminum Alloy AA6061 in Mixture of Phosphoric Acid and Oxalic Acid". Materials Science Forum 857 (mayo de 2016): 237–41. http://dx.doi.org/10.4028/www.scientific.net/msf.857.237.

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In this study, porous anodic alumina was formed on aluminum alloy AA6061 by anodizing using mixture of 0.3 M oxalic acid and phosphoric acid with concentration ranged from 0.1 M to 1.0 M. AA6061 alloys were anodized at 40 V and 25°C for 60 minutes. FESEM images show that the uniformity of the pores arrangement of porous anodic alumina decreased with the increasing concentration of phosphoric acid in the electrolyte. Well-ordered porous anodic alumina was formed in mixture of 0.3 M oxalic acid and 0.1 M phosphoric acid while disordered porous anodic alumina were formed when the concentration of phosphoric acid were in the range of 0.3 M to 1.0 M. Pore size and interpore distance were found to increase with the concentration of phosphoric acid in the mixture. X-ray diffraction patterns show that to γ-Al2O3 were formed on the surface of AA6061 after the anodizing process, regardless of the concentration of phosphoric acid in the mixture electrolyte.
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44

SAITO, Mitsunori y Mitsunobu MIYAGI. "Special issue Tailored structure and functional application of anodized films on aluminum reviews. Optical devices using anodized alumina film." Journal of the Surface Finishing Society of Japan 40, n.º 12 (1989): 1336–39. http://dx.doi.org/10.4139/sfj.40.1336.

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45

Razak, Kamrosni Abdul y Mohd Nazree Derman. "Corrosion Behaviour of Anodised Powder Metallurgy Aluminium-Magnesium Composites". Advanced Materials Research 795 (septiembre de 2013): 469–73. http://dx.doi.org/10.4028/www.scientific.net/amr.795.469.

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The corrosion behavior of anodized powder metallurgy Al/2wt%Mg composites reinforced with the short fibre alumina SaffilTM was studied using potentiodynamic polarization in 3.5% NaCl solutions. The materials under investigation were fabricated using powder metallurgy route. Anodising process has been done to the materials to improve their corrosion resistance. Anodising process were carried out in sulphuric acid solutions with different anodizing voltage, which are 10V, 12V, 14V, 16V and 18V and different concentration of sulphuric acid (5%, 10%, 15%, 20% and 25%). Results from Tafel plot showed that corrosion behavior of PM Al-Mg composites strongly depends on the anodizing parameters. Corrosion resistance increases with the increase in anodizing voltage and concentration of sulphuric acid. The maximum corrosion resistance was recorded by the PM Al-Mg composite anodized using 16V and in the 15% concentration of sulphuric acid.
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46

Stępniowski, Wojciech J., Dariusz Zasada y Zbigniew Bojar. "First step of anodization influences the final nanopore arrangement in anodized alumina". Surface and Coatings Technology 206, n.º 6 (diciembre de 2011): 1416–22. http://dx.doi.org/10.1016/j.surfcoat.2011.09.004.

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47

Lee, Seungwoo, Wook Kim, Sangmin Lee, Sangdeok Shim y Dukhyun Choi. "Controlled transparency and wettability of large-area nanoporous anodized alumina on glass". Scripta Materialia 104 (julio de 2015): 29–32. http://dx.doi.org/10.1016/j.scriptamat.2015.04.001.

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48

Morishita, Yoshitaka, Takaya Hosono y Hiroto Ogawa. "Fabrication of resistive switching memory structure using double-sided-anodized porous alumina". Solid-State Electronics 131 (mayo de 2017): 30–33. http://dx.doi.org/10.1016/j.sse.2017.02.007.

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49

Salamat, Arshi y Tarikul Islam. "Fabrication of an anodized porous alumina relative humidity sensor with improved sensitivity". Instrumentation Science & Technology 48, n.º 2 (13 de septiembre de 2019): 128–45. http://dx.doi.org/10.1080/10739149.2019.1662803.

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50

KIMPTON, D. G. y J. G. SWANSON. "ChemInform Abstract: Formation of Plasma Anodized Alumina Films on In0.53Ga0.47As Device Structures." ChemInform 22, n.º 40 (22 de agosto de 2010): no. http://dx.doi.org/10.1002/chin.199140266.

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