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For the preparation of membranes with an average pore diameter of 40 nm and 90 nm, aluminium was anodized in 0.3 M H 2 C 2 O 4 (98%, Aldrich) under mild and hard anodization conditions at 40 V and 120 V, respectively. A membrane with an average pore diameter of 170 nm was obtained by anodization in 0.1 M H 3 PO 4 at 170 V. In the case of mild.
Title of Thesis: Template synthesis,. Electrochemical anodization of aluminum (mild anodization, hard anodization and pulsed anodization) and titanium. Fabrication of noble metal nanoparticle chains by combining template-assisted electrodeposition with Kirkendall effect or Rayleigh instability and their structural characterization. Synthesis of oxide nanotubes (TiO 2, SiO 2, SnO 2, etc.
SEM images at the bottom surface of H-AAO membranes synthesized by hard anodization in 0.150 M oxalic acid electrolyte containing 5% of ethanol for the anodization voltages of (a) 120 V; (b)130 V; (c) 140 V; (d) 150 V; (e) 160 V, and (f) 170 V. The insets show the respective self-correlated images 1 indicating the variation of the pore ordering degree. a) 120 V 500 nm 500 nm 500 nm 500 nm 500.
Figure 4 - Long-range ordered AAO membranes with modulated pore diameters: (Left) Scheme for the fabrication of porous alumina with modulated pore diameters by a combination of mild and hard anodization on a pre-patterned aluminum substrate; (Right) SEM micrographs showing the cross-section of the prepared AAO with modulated pore diameters.
A comparative study of the structure and transport properties of porous aluminum oxide films obtained by single- and two-step anodization was carried out. It is shown that the oxidation regime significantly affect the number of dead-ended channels, which results in more than twice the variation in membrane permeability. The effect is explained by multiple branching of channels on the initial.Learn More
For example, Lee et al. (2006) used a hard anodization process in order to prepare nanoporous alumina membranes; membranes with uniform pores, high aspect ratios (greater than 1000) and pore.Learn More
The key success of our method is the strong guidance effect of the first hard anodization on the second mild anodization. Highly-ordered (both top and bottom surfaces) porous anodic aluminum (PAA) membranes with interpore spacing from 220 to 350 nm have been realized under anodizing voltages from 100 to 150 V. The interpore spacing is only determined by the first anodizing voltage, while the.Learn More
Fast fabrication of long-range ordered porous alumina membranes by hard anodization. (2005). Highly Flexible, Large Area, Nanoporous Alumina Membranes with Complete Through-Hole Pore Morphology. (2008). Highly ordered anodic porous alumina formation by self-organized anodizing. Nanostructured materials in electrochemistry.Learn More
A commonly accepted procedure to prepare well ordered AAO membranes is called two-step anodization.4 The concept of the two-step anodization is to first generate aligned nanopores, followed by removal of the initial surface alumina layer. This process generates highly ordered indents on the unreacted aluminum surface. These surface indents serve as the nucleation sites and lead to deep.Learn More
Taking our current environmental situation in the world into consideration, people should face growing problems of air and water pollution. Heterogeneous.Learn More
Anodization of valve metal such as those of Al, Ti, and W among others have been extensively studied largely because of their unique morphology and extensive applications including gas and bio-sensing. While large volumes of published materials are available on the oxide of each metal, a concise review of previous works on these anodic oxides is timely. Herein, we present an overview of the.Learn More
This thesis reports, for the first time, synthesis of high-aspect-ratio tantalum oxide nanotube arrays via one-step anodization of Ta foil. The use of aqueous electrolytes containing HF:H2SO4 in the volumetric ratios 1:9 and 2:8 results in formation of ordered nanodimpled surfaces with 40-55 nm pore diameters over the potential range 10-20 V. The addition of 5-10% of either ethylene glycol (EG.Learn More
Article history: Polydimethylsiloxane (PDMS) is a widely used material for replicating micro-structures because of its transparency, deformability, and easy fabrication. At the nanoscale, however, it is hard to fill a nanohole template with uncured PDMS. This paper introduces several simple methods by changing the surface energy of a nanohole template and PDMS elastomer for replicating 100nm.Learn More
Anodic aluminum oxide (AAO) templates possess highlyordered nanoporous structures, with advantages such as high aspect ratio. However, there are limits to control the growth of the traditional AAO arrays, such as interpore distance, pore sizes and densities. In this study, we introduce an innovative nanoimprint process guided AAO fabrication to overcome these limitations of the traditional AAO.Learn More
A Dissertation Presented in Partial Fulfillment of the Requirements for the Degree Doctor of Philosophy Approved November 2015 by the Graduate Supervisory Committee: Jerry Lin, Chair Amaneh Tasooji Terry Alford ARIZONA STATE UNIVERSITY December 2015. i ABSTRACT Large-pore metal-organic framework (MOF) membranes offer potential in a number of gas and liquid separations due to their wide and.Learn More
A thesis submitted for the degree of Doctor of Philosophy by Daniel Paul Warren Department of Mathematical Sciences, Brunel University December 1999. Abstract Eigen-mode matching techniques offer a versatile approach for solving acoustic scattering problems in ducts. However, until recently, these techniques have been restricted to prob- lems in which the boundary conditions contain at most.Learn More