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.

Effects of Anodic Oxidation Process on Transmittance of Porous Alumina on Glass Substrate

2011 ◽  
Vol 179-180 ◽  
pp. 274-278
Author(s):  
Pei Tao Guo ◽  
Zhi Lin Xia ◽  
Yi Yu Xue ◽  
Li Xin Zhao ◽  
Rui Wu
Keyword(s):  
Oxalic Acid ◽  
Phosphoric Acid ◽  
Acid Solution ◽  
Anodic Oxidation ◽  
Glass Substrate ◽  
Porous Alumina ◽  
Oxalic Acid Solution ◽  
Normal Incidence ◽  
Phosphoric Acid Solution ◽  
Alumina Films

Aluminum films were deposited on glass substrate by electron beam heat evaporation, and porous alumina films with high transmittance were prepared by means of anodic oxidation under different anodizing conditions in oxalic acid solution or phosphoric acid solution respectively. Thus the morphology of these porous alumina films was characterized by different structural. he optical transmittance spectrum at normal incidence over the 300~1000nm spectra region were obtained by spectrophotometer, which shows, in visible and ultraviolet light region, the transmittance of porous alumina films prepared in oxalic acid solution is much better than that prepared in phosphoric acid solution. The SEM analysis results showed that the pores are circular and uniform in porous alumina prepared in oxalic acid but irregular and non-uniform in that prepared in phosphoric acid, which affected the surface roughness of alumina films.

scholarly journals Continuos Operation of Chromium (VI) Recovery from Sulfuric Acid Solution by Liquid Surfactant Membrane.

1991 ◽  
Vol 17 (6) ◽  
pp. 1104-1109 ◽  
Author(s):  
Yasushige Mori ◽  
Shingo Hibin ◽  
Hideyuki Uemae ◽  
Masataka Tanigaki ◽  
Wataru Eguchi
Keyword(s):  
Sulfuric Acid ◽  
Acid Solution ◽  
Sulfuric Acid Solution ◽  
Chromium Vi
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