The Synthesis of Nano-Porous Alumina by Anodization Process

2015 ◽  
Vol 781 ◽  
pp. 235-238
Author(s):  
Ekarach Jaroonpak ◽  
Porntawee Terawan ◽  
Naruemon Wannawong ◽  
Arkom Kaewrawang ◽  
Chaiyaput Kruehong ◽  
...  
Keyword(s):  
Electron Microscope ◽  
Oxalic Acid ◽  
Pore Diameter ◽  
Porous Alumina ◽  
Voltage Source ◽  
Aluminum Surface ◽  
Dc Voltage ◽  
Anodization Process ◽  
Pore Depth ◽  
Scanning Electron

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.

Preparation of Porous Alumina by Anodization

2005 ◽  
Vol 23 ◽  
pp. 75-78 ◽  
Author(s):  
C.X. Xu ◽  
X.S. Zhang ◽  
X.W. Sun
Keyword(s):  
Sulfuric Acid ◽  
Oxalic Acid ◽  
Acid Solution ◽  
Sulfuric Acid Solution ◽  
Porous Alumina ◽  
Fabrication Process ◽  
Alumina Films ◽  
Anodization Process

The characteristics of porous alumina produced by anodization in both oxalic acid and sulfuric acid solution have been studied. The diameter of the pores for oxalic acid as electrolyte is about 60 nm and for sulfuric acid as electrolyte is about 30 nm. The morphologies of the pores have been improved by two-step anodization process. It has been observed that the temperature and operation voltage are two of the most important factors in the fabrication process of porous alumina films.

scholarly journals Formation of Flower-Like Crystals of Tris(8-hydroxyquinoline)aluminum from 8-Hydroxyquinoline on Anodic Porous Alumina

2017 ◽  
Vol 2017 ◽  
pp. 1-10 ◽  
Author(s):  
Shohei Yamaguchi ◽  
Tomohiro Iida ◽  
Kazunori Matsui
Keyword(s):  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Porous Alumina ◽  
Energy Dispersive ◽  
X Ray Diffraction ◽  
X Ray ◽  
Anodic Porous Alumina ◽  
Microscope Images ◽  
Green Photoluminescence ◽  
Scanning Electron

The treatment of anodic porous alumina (APA) plates in heated water containing 8-hydroxyquinoline (HQ) produces crystalline tris(8-hydroxyquinoline)aluminum (Alq3) microbelts about 5–10 μm wide and 5–20 μm long. These microbelts were found to aggregate to form flower-like structures on the surface. X-ray diffraction studies indicated that the Alq3 microbelts are composed of an α-phase having a meridional structure. The Alq3 microbelts exhibited green photoluminescence with a peak at around 520 nm. Scanning electron microscope images and energy dispersive X-ray spectra showed that this reaction is induced at the APA surface by the reaction between the HQ and amorphous Al2O3 species.

scholarly journals Pollen morphology of Plantago species native to Poland and their taxonomic implications

2011 ◽  
Vol 73 (4) ◽  
pp. 315-325 ◽  
Author(s):  
Małgorzata Klimko ◽  
Krystyna Idzikowska ◽  
Mariola Truchan ◽  
Anna Kreft
Keyword(s):  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Light Microscope ◽  
Pollen Morphology ◽  
Pore Diameter ◽  
Pollen Grains ◽  
Pollen Grain ◽  
Prolate Spheroidal ◽  
Taxonomic Implications ◽  
Scanning Electron

Pollen grains of 9 species of the genus <em>Plantago</em> (Plantaginaceae), including 8 taxa native to Poland, were observed under a light microscope and a scanning electron microscope. Descriptions of grain sculpture are illustrated only SEM micrographs. The studied pollen grains were medium-sized or small, spherical or prolate spheroidal. Their sculpture was always verrucate with granulation. In the studied taxa, internal apertures had the form of pores. Their number ranged from (4)5-9(14). The pores were scattered on the surface of pollen grains. Identification features of individual taxa include: presence or absence of an annulus around each pore, annulus structure, ornamentation of the pollen grain and operculum, type of aperture membrane, number of internal pores, and pore diameter. We suggest that two new pollen grain types, characteristic of <em>P. intermedia</em> and <em>P. arenaria</em>, should be distinguished, and that <em>P. alpina</em> should be assigned to the <em>P. coronopus</em> type.

scholarly journals FORMATION OF ANODIC POROUS ALUMINA IN OXALIC ACID AND ELECTRODEPOSITION OF NI.

2020 ◽  
Vol 2 (33(60)) ◽  
pp. 37-41
Author(s):  
A. Khamidov ◽  
S. Nurmanov ◽  
O. Ruzimuradov ◽  
A. Parmonov
Keyword(s):  
Oxalic Acid ◽  
Aluminum Oxide ◽  
Pore Size ◽  
Porous Alumina ◽  
3D Metals ◽  
Interpore Distance ◽  
Anodic Porous Alumina ◽  
Anodization Process ◽  
Nanoporous Anodic Aluminum Oxide ◽  
Tubular Membranes

Nanoporous anodic aluminum oxide (AAO) tubular membranes were fabricated from aluminum alloy tubes in sulfuric and oxalic acid electrolytes using a two-step anodization process. The membranes were investigated for characteristics such as pore size, interpore distance and thickness by varying applied voltage and electrolyte concentration. Morphology of the membranes was examined using light optical and scanning electron microscopy and characterized using Image software. Results showed that membranes having narrow pore size and uniform pore distribution with parallel channel arrays were obtained. The pore sizes were ranging from 10 to 100 nm and the wall thicknesses 60 μm. The catalysts are obtained by impregnation of 3d metals into nanosized pores of aluminum oxide. The obtained catalysts based on nickel and porous Al2O3 are studied by scanning microscopy (SEM-EDX). The results of SEM-EDX analysis shows that a spongy structure with filament sizes of 100 nanometers containing particles of 3d metals formed on the surface of the aluminum oxide matrix.

Vertical Alignment TiO2 Nanotube Based on Ti Film Prepared via Anodization Technique

2016 ◽  
Vol 675-676 ◽  
pp. 167-170
Author(s):  
Kamon Aiempanakit ◽  
Sukittaya Jessadaluk ◽  
Sunisa Tongmaha ◽  
Attawit Supati ◽  
Narathon Khemasiri ◽  
...  
Keyword(s):  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Ethylene Glycol ◽  
Cross Section ◽  
Metal Film ◽  
Ammonium Fluoride ◽  
Tube Diameter ◽  
Vertical Alignment ◽  
Anodization Process ◽  
Scanning Electron

A highly ordered nanotube TiO2 was successfully prepared from sputtered Ti metal film using anodization process. Ethylene glycol and ammonium fluoride was introduced as the electrolyte solution. The applied of anodizing voltage was systematically controlled between 20 - 60 volts along fabrication process, respectively. The physical characteristic of the fabricated TiO2 nanotube including anodizing rate, tube diameter and tube width was investigated through the characterization system as field emission scanning electron microscope (FE-SEM). According to cross-section FE-SEM photograph, the anodizing rate and tube width significantly increases when the anodizing voltage was future increased due to higher the electric field. Moreover, the tube diameter directly depends with the anodizing voltage also. The anodizing voltage provides a significant role on the feature of TiO2 nanotube. Finally, the fabricated nanotube TiO2 is potentially promising for Photo-activated application and Nanostructure template.

Fabrication of Sequential Nanostripes by Controlled Electrodeposition

2002 ◽  
Vol 750 ◽  
Author(s):  
M. Mikhaylova ◽  
D. K. Kim ◽  
M. Toprak ◽  
M. Muhammed
Keyword(s):  
Oxalic Acid ◽  
Noble Metals ◽  
Pore Diameter ◽  
Electrochemical Anodization ◽  
Anodic Alumina Membrane ◽  
High Toxicity ◽  
Alumina Membrane ◽  
Anodization Process ◽  
Au Nanowires ◽  
Hexagonally Ordered

ABSTRACTAu nanowires and sequential metal nanostripes were prepared by AC pulse electrodeposition in anodic alumina membrane (AAM). Due to the high toxicity of cyanide-based electrolytes, which commonly used for electrodeposition of noble metals, new types of Au electroplating solution has been introduced. Electroplating solutions of noble metals Au, Ag and Pt were alternately used for nanostripes fabrication. The AAM was prepared by a two-step electrochemical anodization process in oxalic acid. The pore size was controlled by varying anodizing voltage and current density. The AAM was investigated by SEM and AFM. The results show hexagonally ordered channels with a pore diameter 50 nm. The morphology and composition of nanowires and nanostripes were examined by TEM and optical microscopes, which show uniformly, ordered Au nanowires with a length about 250 nm and a diameter about 50 nm. Au-Ag-Au-Pt-Au sequential nanostripes have a length about 3.5 μm and diameter 50 nm has been successfully prepared.

Fabricating Polyvinyl Alcohol Fibers with Evenly Distributed Nano Silver

2015 ◽  
Vol 827 ◽  
pp. 95-98 ◽  
Author(s):  
Harsojo ◽  
Anna Layla ◽  
Kuwat Triyana ◽  
Harini Sosiati
Keyword(s):  
Silver Nanoparticles ◽  
Electron Microscope ◽  
Optical Property ◽  
Scanning Electron Microscope ◽  
Polyvinyl Alcohol ◽  
Room Temperature ◽  
Hole Diameter ◽  
Dc Voltage ◽  
Transmission Electron ◽  
Scanning Electron

Fabrication of polyvinyl alcohol (PVA) fibers loaded with evenly distributed nanosilver has been sucessfully done using electrospinner. The electrospinner is set at 15 kV DC voltage with distance between electrodes 13 cm, using a syringe hole diameter 0,5 mm. The feeding solution for the electrospinning was prepared by directly mixing the solution of PVA in water with a stable colloid of nanosilver at room temperature. The fibers morphology was characterized using scanning electron microscope. The optical property was tested using spectrometer. The distribution of silver nanoparticles in the fibers was tested using transmission electron microscope. The result indicates that the fibers still showing plasmonic property of silver having peak at 410 nm with no crystaline changes. The diameter of fibers loaded with nanosilver are smaller compared to that of the ones without nanosilver.The distribution of nanosilver in fibers made of PVA and the ones made of PVA and chitosan are compared and discussed.

Morphology, Distribution and Identification of Micro-Constituents Along Grain Boundaries in Nickel-Base Alloys

1973 ◽  
Vol 31 ◽  
pp. 176-177
Author(s):  
D. E. Fornwalt ◽  
A. R. Geary ◽  
B. H. Kear
Keyword(s):  
Electron Microscope ◽  
Grain Boundaries ◽  
Volume Fraction ◽  
Rupture Life ◽  
Stress Rupture ◽  
High Volume ◽  
Precipitate Morphology ◽  
Stress Rupture Life ◽  
Nickel Base ◽  
Scanning Electron

A systematic study has been made of the effects of various heat treatments on the microstructures of several experimental high volume fraction γ’ precipitation hardened nickel-base alloys, after doping with ∼2 w/o Hf so as to improve the stress rupture life and ductility. The most significant microstructural chan§e brought about by prolonged aging at temperatures in the range 1600°-1900°F was the decoration of grain boundaries with precipitate particles.Precipitation along the grain boundaries was first detected by optical microscopy, but it was necessary to use the scanning electron microscope to reveal the details of the precipitate morphology. Figure 1(a) shows the grain boundary precipitates in relief, after partial dissolution of the surrounding γ + γ’ matrix.

The Alteration of the Pore Spaces in Sandstones

1973 ◽  
Vol 31 ◽  
pp. 210-211
Author(s):  
R. E. Ferrell ◽  
G. G. Paulson
Keyword(s):  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
The Other ◽  
Coarse Grained ◽  
Depositional Fabric ◽  
Soluble Components ◽  
Scanning Electron ◽  
Shape And Size

The pore spaces in sandstones are the result of the original depositional fabric and the degree of post-depositional alteration that the rock has experienced. The largest pore volumes are present in coarse-grained, well-sorted materials with high sphericity. The chief mechanisms which alter the shape and size of the pores are precipitation of cementing agents and the dissolution of soluble components. Each process may operate alone or in combination with the other, or there may be several generations of cementation and solution.The scanning electron microscope has ‘been used in this study to reveal the morphology of the pore spaces in a variety of moderate porosity, orthoquartzites.

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