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

2013 ◽  
Vol 45 (10) ◽  
pp. 1490-1496 ◽  
Author(s):  
Fereshteh Rashidi ◽  
Tatsuya Masuda ◽  
Hidetaka Asoh ◽  
Sachiko Ono
Keyword(s):  
Pure Aluminum ◽  
Anodic Alumina ◽  
Nanoporous Anodic Alumina

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

2008 ◽  
Vol 22 (18n19) ◽  
pp. 3267-3277 ◽  
Author(s):  
M. H. RAHIMI ◽  
S. H. TABAIAN ◽  
S. P. HOVEYDA MARASHI ◽  
M. AMIRI ◽  
M. M. DALALY ◽  
...  
Keyword(s):  
Surface Roughness ◽  
Pure Aluminum ◽  
Optical Microscope ◽  
Anodic Alumina ◽  
The Other ◽  
Sem Images ◽  
Current Time ◽  
Nanoporous Anodic Alumina ◽  
Alumina Membranes ◽  
Stress Relieving

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.

Photoswitchable Membranes Based on Peptide‐Modified Nanoporous Anodic Alumina: Toward Smart Membranes for On‐Demand Molecular Transport

2015 ◽  
Vol 27 (19) ◽  
pp. 3019-3024 ◽  
Author(s):  
Tushar Kumeria ◽  
Jingxian Yu ◽  
Mohammed Alsawat ◽  
Mahaveer D. Kurkuri ◽  
Abel Santos ◽  
...  
Keyword(s):  
Molecular Transport ◽  
Anodic Alumina ◽  
Nanoporous Anodic Alumina ◽  
On Demand

New 8-oxo-7,8-2´deoxyguanosine nanoporous anodic alumina aptasensor for colorectal cancer diagnosis in blood and urine

Nanoscale ◽  
2021 ◽  
Author(s):  
Luis Pla ◽  
Felix Sancenón ◽  
M.Carmen Martinez-Bisbal ◽  
Celia Banuls ◽  
Nuria Estañ ◽  
...  
Keyword(s):  
Oxidative Stress ◽  
Colorectal Cancer ◽  
Cancer Diagnosis ◽  
Anodic Alumina ◽  
Human Diseases ◽  
Nanoporous Anodic Alumina

Many important human diseases, and specially cancer, have been related to the overproduction of 8-oxo-7,8-dihydro-2´-deoxyguanosine (8-oxo-dG). This molecule is a product of oxidative stress processes over nucleophilic bases in DNA....

Thin nanoporous anodic alumina film on aluminium for passive radiative cooling

Pramana ◽  
2021 ◽  
Vol 95 (1) ◽  
Author(s):  
Jitendra K Pradhan ◽  
Dheeraj Pratap ◽  
S Anantha Ramakrishna
Keyword(s):  
Anodic Alumina ◽  
Radiative Cooling ◽  
Alumina Film ◽  
Nanoporous Anodic Alumina ◽  
Anodic Alumina Film

scholarly journals Spatially Ordered Matrix of Nanostructured Tin–Tungsten Oxides Nanocomposites Formed by Ionic Layer Deposition for Gas Sensing

Sensors ◽  
2021 ◽  
Vol 21 (12) ◽  
pp. 4169
Author(s):  
Gennady Gorokh ◽  
Natalia Bogomazova ◽  
Abdelhafed Taleb ◽  
Valery Zhylinski ◽  
Timur Galkovsky ◽  
...  
Keyword(s):  
Tungsten Oxide ◽  
Gas Sensing ◽  
Oxide Films ◽  
High Sensitivity ◽  
Anodic Alumina ◽  
Film Deposition ◽  
Silicon Substrates ◽  
Layer By Layer ◽  
Gas Sensitivity ◽  
Nanoporous Anodic Alumina

The process of layer-by-layer ionic deposition of tin-tungsten oxide films on smooth silicon substrates and nanoporous anodic alumina matrices has been studied. To achieve the film deposition, solutions containing cationic SnF2 or SnCl2 and anionic Na2WO4 or (NH4)2O·WO3 precursors have been used. The effect of the solution compositions on the films deposition rates, morphology, composition, and properties was investigated. Possible mechanisms of tin-tungsten oxide films deposition into the pores and on the surface of anodic alumina are discussed. The electro-physical and gas-sensitive properties of nanostructured SnxWyOz films have been investigated. The prepared nanocomposites exhibit stable semiconductor properties characterized by high resistance and low temperature coefficient of electrical resistance of about 1.6 × 10−3 K−1. The sensitivity of the SnxWyOz films to 2 and 10 ppm concentrations of ammonia at 523 K was 0.35 and 1.17, respectively. At concentrations of 1 and 2 ppm of nitrogen dioxide, the sensitivity was 0.48 and 1.4, respectively, at a temperature of 473 K. At the temperature of 573 K, the sensitivity of 1.3 was obtained for 100 ppm of ethanol. The prepared nanostructured tin-tungsten oxide films showed promising gas-sensitivity, which makes them a good candidate for the manufacturing of gas sensors with high sensitivity and low power consumption.

Nanoporous Anodic Alumina Barcodes: Toward Smart Optical Biosensors

2012 ◽  
Vol 24 (8) ◽  
pp. 1050-1054 ◽  
Author(s):  
Abel Santos ◽  
Victor S. Balderrama ◽  
María Alba ◽  
Pilar Formentín ◽  
Josep Ferré-Borrull ◽  
...  
Keyword(s):  
Anodic Alumina ◽  
Optical Biosensors ◽  
Nanoporous Anodic Alumina

scholarly journals Controllable gold-capped nanoporous anodic alumina chip for label-free, specific detection of bacterial cells

RSC Advances ◽  
2017 ◽  
Vol 7 (30) ◽  
pp. 18815-18820 ◽  
Author(s):  
Do-Kyun Kim ◽  
Dong Min Kim ◽  
Seung Min Yoo ◽  
Sang Yup Lee
Keyword(s):  
Anodic Alumina ◽  
Bacterial Cells ◽  
Label Free ◽  
Single Chip ◽  
Specific Detection ◽  
Nanoporous Anodic Alumina ◽  
Quantitative Manner

A gold-capped nanostructured PAA sensor that uses aptamers detected bacterial cells in a quantitative manner with high specificities on a single chip.

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