Preparation and Characterization of Anodic Alumina Membrane with Nanopore Arrays

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.

SYNTHESIS OF In2O3 NANOWIRES ENHANCED BY ANODIC ALUMINA MEMBRANE

2006 ◽  
Vol 05 (04n05) ◽  
pp. 479-485
Author(s):  
C. W. LAI ◽  
X. Y. ZHANG ◽  
H. C. ONG ◽  
J. Y. DAI ◽  
H. L. W. CHAN
Keyword(s):  
Electron Microscopy ◽  
Large Scale ◽  
Anodic Alumina ◽  
X Ray Diffraction ◽  
Alumina Membrane ◽  
Thermal Evaporation Method ◽  
Single Crystalline ◽  
X Ray ◽  
Alumina Membranes ◽  
Transmission Electron

Large-scale single crystalline In 2 O 3 nanowires were successfully synthesized on anodic alumina membranes by a simple thermal evaporation method at 570°C. X-ray diffraction, transmission electron microscopy, and scanning electron microscopy studies revealed the formation of single crystalline In 2 O 3 nanowires with diameters of 50–100 nm and lengths of up to a few hundreds of micrometers. Cathodeluminescence study revealed existence of oxygen vacancies evidenced by a strong and broad emission at 470 nm with a shoulder at 400 nm. The growth mechanism of the nanostructures is also discussed.

One-Step Anodization Preparation and Photoluminescence Property of Anodic Aluminum Oxide with Nanopore Arrays

2010 ◽  
Vol 663-665 ◽  
pp. 272-275
Author(s):  
Wen Bin Yang ◽  
Xiao Hong Tang
Keyword(s):  
Aluminum Oxide ◽  
Anodic Aluminum Oxide ◽  
Oxygen Vacancies ◽  
Pure Aluminum ◽  
Photoluminescence Property ◽  
Aluminum Foil ◽  
Honeycomb Structure ◽  
Anodic Aluminum ◽  
Nanopore Arrays ◽  
One Step

Anodic aluminum oxide (AAO) film with nanopore arrays was prepared by one-step anodization of highly pure aluminum foil. Morphology, structure and photoluminescence property of AAO were characterized. Results showed that AAO owned honeycomb structure which was characterized by close-packed arrays of columnar hexagonal cells, each containing a central pore normal to the substrate. There were three peaks at around 370, 385 and 470 nm in the PL spectrum of AAO, which should be mainly attributed to the oxygen vacancies.

scholarly journals Nano-PAA-CuCl2 Composite as Fenton-Like Reusable Catalyst to Enhanced Degrade Organic Pollutant MB/MO

Catalysts ◽  
2020 ◽  
Vol 11 (1) ◽  
pp. 10
Author(s):  
Yang Dang ◽  
Yu Cheng ◽  
Yukun Zhou ◽  
Yifei Huang ◽  
Kaige Wang
Keyword(s):  
Photoelectron Spectroscopy ◽  
Self Assembly ◽  
Organic Pollutant ◽  
Energy Dispersive Spectrometer ◽  
Chemical Properties ◽  
Anodic Alumina ◽  
Alumina Substrate ◽  
Reusable Catalyst ◽  
X Ray ◽  
Nanoporous Anodic Alumina

The treatment of organic dye contaminants in wastewaters has now becoming more imperative. Fenton-like degradation of methylene blue (MB) and methyl orange (MO) in aqueous solution was investigated by using a nanostructure that a layer of CuCl2 nanoflake film grown on the top surface of nanoporus anodic alumina substrate (nano-PAA-CuCl2) as catalyst. The new nano-PAA-CuCl2 composite was fabricated with self-assembly approach, that is, a network porous structure film composed of CuCl2 nanoflake grown on the upper surface of nanoporous anodic alumina substrate, and the physical and chemical properties are characterized systematically with the X-ray diffraction (XRD), field emission scanning electron microscope (FE-SEM), and high-resolution transmission electron microscopy (HRTEM), Energy Dispersive Spectrometer (EDS), X-ray photoelectron spectroscopy (XPS). The experimental results showed that the nano-PAA-CuCl2 catalyst presented excellent properties for the degradation of two typical organic pollutants such as MB and MO, which were almost completely degraded with 8 × 10−4mol/L nano-PAA-CuCl2 catalyst after 46 min and 60 min at reaction conditions of H2O2 18 mM and 23 mM, respectively. The effects of different reaction parameters such as initial pH, H2O2 concentration, catalyst morphology and temperature were attentively studied. And more, the stability and reusability of nano-PAA-CuCl2 were examined. Finally, the mechanism of MB and MO degradation by the nano-PAA-CuCl2/H2O2 system was proposed, based on the experimental data of the BCA and the temperature-programmed reduction (H2-TPR) and theoretical analysis, the reaction kinetics belonged to the pseudo-first-order equation. This new nanoporous composite material and preparation technology, as well as its application in Fenton-like reaction, provide an effective alternative method with practical application significance for wastewater treatment.

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.

THE DEPENDENCE OF ALUMINA NANOWIRE FORMATION FROM POROUS ANODIC ALUMINA MEMBRANES ON THE ETCHING SOLUTION

2012 ◽  
Vol 26 (03) ◽  
pp. 1150017 ◽  
Author(s):  
JIN KYU HAN ◽  
JIN HO KWAK ◽  
YONG CHAN CHOI ◽  
SANG DON BU
Keyword(s):  
Formation Mechanism ◽  
Anodic Alumina ◽  
Porous Anodic Alumina ◽  
Morphological Properties ◽  
Alumina Membrane ◽  
Etching Solution ◽  
Membrane Filters ◽  
Alumina Membranes ◽  
Technological Developments ◽  
Selection Of

We describe variations in the structure and formation mechanism of alumina nanowires (ANWs) formed from porous anodic alumina (PAA) membranes, depending on the composition of the etching solution. Two types of ANWs were synthesized by etching PAA membranes in etching solutions containing H 3 PO 4 or NaOH . Not only did the ANW formation mechanism vary, but also the morphological properties and the surface chemical composition of the ANWs varied with the etching solution used. These results suggest that the ANW surfaces may be optimized by the appropriate selection of etching solution. The optimization of ANWs may potentially advance, for example, water purification technological developments because ANWs have, in recent studies, provided more effective filtration performances than nanoporous alumina membrane filters.

Fabrication, characterization, and photoluminescence properties of highly ordered TiO2 nanowire arrays

2001 ◽  
Vol 16 (4) ◽  
pp. 1138-1144 ◽  
Author(s):  
Y. Lei ◽  
L. D. Zhang
Keyword(s):  
Anatase Phase ◽  
Sol Gel ◽  
Broad Band ◽  
Anodic Alumina ◽  
Nanowire Arrays ◽  
Photoluminescence Properties ◽  
Alumina Membrane ◽  
Tio2 Nanowire ◽  
Alumina Membranes ◽  
Center Area

Highly ordered TiO2 nanowire arrays were prepared in anodic alumina membranes by a sol-gel method. The nanowires are single-crystalline anatase phase with uniform diameters around 50 nm. At room temperature, photoluminescence (PL) measurements of these TiO2 nanowire arrays showed a visible broad band with three peaks, which were located at about 425, 460, and 530 nm that are attributed to self-trapped excitons, F, and F+ centers, respectively. A model is also presented to explain the PL intensity drop-down of the TiO2 nanowire arrays embedded in the alumina membrane: the blue PL band of the anodic alumina membranes arises from the F+ centers on the pore walls, and the TiO2 nanowires first form in the center area of the pores and then extend to the pore walls.

Photoluminescence properties of anodic alumina membranes with ordered nanopore arrays

2006 ◽  
Vol 121 (2) ◽  
pp. 588-594 ◽  
Author(s):  
Xiuyu Sun ◽  
Faqiang Xu ◽  
Zongmu Li ◽  
Wenhua Zhang
Keyword(s):  
Anodic Alumina ◽  
Photoluminescence Properties ◽  
Alumina Membranes ◽  
Nanopore Arrays

Electrodeposition of Ni and Ni-Cu Nanowires in Rectified Porous Anodic Alumina Membrane

2010 ◽  
Vol 663-665 ◽  
pp. 1121-1124
Author(s):  
Yan Zuo ◽  
Juan Tang ◽  
Xiao Tian Li ◽  
Yan Zhao ◽  
Hai Lan Gong ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Anodic Alumina ◽  
Porous Anodic Alumina ◽  
Anodic Alumina Membrane ◽  
Squid Magnetometry ◽  
Alumina Membrane ◽  
X Ray ◽  
Cu Nanowires ◽  
Remanence Ratio ◽  
Scanning Electron

Highly ordered Ni and Ni-Cu nanowires were electrodeposited into the micropores of the porous anodic alumina (PAA) template which was fabricated by the method of two-step anodizing and the thickness of barrier layer which was formed during the anodizing process was rectified by applying current limited anodization steps. The X-ray diffration (XRD) was used to characterize the Ni and Ni-Cu nanowires and the morphology of these nanowires was examined by the way of scanning electron microscopy (SEM). The SQUID magnetometry was used to investigate the magetic properties of the nanowires. It is found that the coercivity and remanence ratio of Ni-Cu nanowire is larger than that of Ni nanowire.

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