Title of article :
Effect of anodizing voltage on the sorption of water molecules on porous alumina
Author/Authors :
I. Vrublevsky، نويسنده , , K. Chernyakova، نويسنده , , A. Bund، نويسنده , , A. Ispas، نويسنده , , U. Schmidt، نويسنده ,
Issue Information :
روزنامه با شماره پیاپی سال 2012
Pages :
5
From page :
5394
To page :
5398
Abstract :
The amount of water adsorbed on different centers on the surface of oxalic acid alumina films is a function of the anodizing voltage. It is decreased with increasing the anodizing voltage from 20 up to 50 V, came up to maximum value at 20–30 V and slightly increased at voltages above 50 V. Water adsorption by oxide films formed at voltages below 50 V can be due to the negative surface charge that is present on the alumina surface. The negative surface charge disappears in the films formed at voltages higher than 50 V, and thus, the water is adsorbed on aluminum ions in a tetrahedral and octahedral environment. The correlation between anodizing conditions of aluminum in oxalic acid and the structure and composition of anodic alumina was established by Fourier transform infrared spectroscopy (FTIR) and scanning electron microscopy (SEM), thermogravimetric and differential thermal analyses (TG/DTA).
Keywords :
Oxalic acid alumina films , Water sorption , DTA , Adsorption centers
Journal title :
Applied Surface Science
Serial Year :
2012
Journal title :
Applied Surface Science
Record number :
1004940
Link To Document :
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