The Role of Stress in the Self-Organized Growth of Porous Anodic Alumina

2016 ◽  
Vol 8 (12) ◽  
pp. 8017-8023 ◽  
Author(s):  
Jinfu Liao ◽  
Zhiyuan Ling ◽  
Yi Li ◽  
Xing Hu
Keyword(s):  
Anodic Alumina ◽  
The Self ◽  
Porous Anodic Alumina ◽  
Self Organized

Sputter Deposition of Self-Organized Nanoclusters Through Porous Anodic Alumina Templates

2007 ◽  
Vol 7 (2) ◽  
pp. 641-646 ◽  
Author(s):  
Smita Gohil ◽  
Ramesh Chandra ◽  
Bhagyashree Chalke ◽  
Sangita Bose ◽  
Pushan Ayyub
Keyword(s):  
Ambient Pressure ◽  
Anodic Alumina ◽  
Porous Anodic Alumina ◽  
Average Pore ◽  
Self Organized ◽  
Atomic Force ◽  
Sputter Deposited ◽  
Anodic Alumina Templates ◽  
Hexagonally Ordered ◽  
Ordered Porous

Silver nanoparticles were sputter deposited through self organized hexagonally ordered porous anodic alumina templates that were fabricated using a two-step anodization process. The average pore diameter of the template was 90 nm and the interpore spacing was 120 nm. Atomic force microscope studies of the sputter-deposited silver nanoparticle array on a Si substrate indicate an approximate replication of the porous anodic alumina mask. The nature of the deposition depends strongly on the process parameters such as sputtering voltage, ambient pressure and substrate temperature. We report a detailed study of the sputtering conditions that lead to an optimal deposition through the template.

scholarly journals Etching the Oxide Barrier of Micrometer-Scale Self-Organized Porous Anodic Alumina Membranes

2015 ◽  
Vol 162 (4) ◽  
pp. E47-E50 ◽  
Author(s):  
Jonathan Bellemare ◽  
Louis-Philippe Carignan ◽  
Frédéric Sirois ◽  
David Ménard
Keyword(s):  
Anodic Alumina ◽  
Porous Anodic Alumina ◽  
Alumina Membranes ◽  
Self Organized ◽  
Oxide Barrier ◽  
Micrometer Scale

Petal-Like Morphology on the Surface of Porous Anodic Alumina

2011 ◽  
Vol 194-196 ◽  
pp. 818-824
Author(s):  
Ye Song ◽  
Qiu Mei Ye ◽  
Peng Liu ◽  
Jun Jun Hu ◽  
Xin Hua Zhu
Keyword(s):  
High Pressure ◽  
Liquid Flow ◽  
Driving Force ◽  
Gas Flow ◽  
Anodic Alumina ◽  
The Self ◽  
Porous Anodic Alumina ◽  
Electronic Current ◽  
Micro Gas Flow ◽  
Pore Bottom

The formation process of a petal-like morphology on the surface of porous anodic alumina (PAA) is discussed in detail. During the anodizing process, the electronic current is produced within the growing oxide, which results in the oxygen evolution at the pore bottom. The pressure of the oxygen bubbles increases along with the anodizing process, and their high pressure acts as a driving-force of the micro-gas-flow, resulting in the micro-liquid-flow in the pores of PAA. The micro-liquid-flow can flow into each other between a center pore and the nearest neighboring pores. The nanogroove between two pores can be formed due to the dissolving effect during the process of micro-liquid-flow between the two pores. This leads to the formation of the petal-like morphology on the PAA surface. As the micro-liquid-flow leaves off the pore bottom, there a local vacuum is formed. This local vacuum behaves as a driving-force of the micro-liquid-flow, making the electrolyte renovated in the nanopores. The renovated electrolyte can provide enough anions or impurity centers, which are the cause of the generation of the electronic current. The self-organizing for the petal-like morphology on PAA surface is mainly dependent upon the high pressure of the oxygen bubbles and the local vacuum produced at the pore bottom. The present results may help us to understand the nature of the self-organization in the porous anodic oxides.

scholarly journals Water: the bloodstream of the biosphere

2003 ◽  
Vol 358 (1440) ◽  
pp. 1921-1934 ◽  
Author(s):  
Wilhelm Ripl
Keyword(s):  
Essential Role ◽  
Phase Changes ◽  
The Self ◽  
System Efficiency ◽  
Ecological Efficiency ◽  
Natural Systems ◽  
Self Organized ◽  
Sustainable Landscapes ◽  
Cyclic Processes

Water, the bloodstream of the biosphere, determines the sustainability of living systems. The essential role of water is expanded in a conceptual model of energy dissipation, based on the water balance of whole landscapes. In this model, the underlying role of water phase changes--and their energy-dissipative properties--in the function and the self-organized development of natural systems is explicitly recognized. The energy-dissipating processes regulate the ecological dynamics within the Earth's biosphere, in such a way that the development of natural systems is never allowed to proceed in an undirected or random way. A fundamental characteristic of self-organized development in natural systems is the increasing role of cyclic processes while loss processes are correspondingly reduced. This gives a coincidental increase in system efficiency, which is the basis of growing stability and sustainability. Growing sustainability can be seen as an increase of ecological efficiency, which is applicable at all levels up to whole landscapes. Criteria for necessary changes in society and for the design of the measures that are necessary to restore sustainable landscapes and waters are derived.

Determination of the field strength and realization of the high-field anodization of aluminum

2017 ◽  
Vol 19 (32) ◽  
pp. 21696-21706 ◽  
Author(s):  
Ji Xing ◽  
Sitong Lu ◽  
Chi Zhang ◽  
Min Yin ◽  
Dongdong Li ◽  
...  
Keyword(s):  
Field Strength ◽  
Electric Field ◽  
Electric Field Strength ◽  
High Field ◽  
Anodic Alumina ◽  
The Self ◽  
Porous Anodic Alumina ◽  
Aluminum Anodization

The electric field strength during aluminum anodization was clarified, and this work can shed some light on the self-ordering mechanism of porous anodic alumina.

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