Effects of Anodization Time and Temperature on the Pore Arrangement of Porous Anodic Alumina Anodized in Sulfuric Acid

2013 ◽  
Vol 63 (11) ◽  
pp. 1249-1253
Author(s):  
Jin Ho KWAK ◽  
Jin Kyu HAN ◽  
Yong Chan CHOI ◽  
Sang Don BU*
2012 ◽  
Vol 258 (12) ◽  
pp. 4995-5000 ◽  
Author(s):  
Mondher Ghrib ◽  
Rachid Ouertani ◽  
Monir Gaidi ◽  
Najoua Khedher ◽  
Mohamed Ben Salem ◽  
...  

2013 ◽  
Vol 832 ◽  
pp. 101-106 ◽  
Author(s):  
C.H. Voon ◽  
M.N. Derman ◽  
U. Hashim ◽  
K.L. Foo ◽  
Tijjani Adam

In this study, the effect of anodizing voltage on the morphology of porous anodic alumina and growth kinetics of anodizing of aluminium manganese alloy was reported. It was found that the increasing anodizing voltage affect the morphology and dimensional parameters of porous AAO. Both pore diameter and interpore distance increased as a function of anodizing voltage. The regularity of porous AAO was affected by anodizing voltage. Dielectric breakdown occurred at anodizing voltage of 70 V and led to protrusions and cracks of the porous anodic alumina. Moderate anodizing voltage promoted the formation of well ordered pore arrangement while disordered pore arrangement was observed when the anodizing voltage was too low or too high. The thickness of porous AAO increased as the anodizing voltage increased.


2006 ◽  
Vol 137 (11) ◽  
pp. 621-624 ◽  
Author(s):  
G.S. Huang ◽  
X.L. Wu ◽  
G.G. Siu ◽  
Paul K. Chu

2015 ◽  
Vol 1109 ◽  
pp. 73-77
Author(s):  
Chun Hong Voon ◽  
Mohd Nazree Derman ◽  
U. Hashim ◽  
Bee Ying Lim ◽  
Sung Ting Sam

In this study, oxide dissolution treatment was used for the formation of well ordered porous anodic alumina. Porous anodic alumina was formed on mechanically polished high purity aluminium by anodizing at 50 V in 0.3 M oxalic acid of 15°C for 60 minutes. It is observed that the pore arrangement of as anodized porous anodic alumina was randomly distributed and showed no ordered hexagonal cell structure. As anodized porous anodic alumina were then subjected to oxide dissolution treatment of increasing exposure duration, up to three minutes. Micrographs were captured by using scanning electron microscope. Pore arrangement of porous anodic alumina subjected to oxide dissolution treatment up to two minutes were similar to one another where no ordered periodic structures were formed. .When porous anodic alumina subjected to oxide dissolution treatment for three minutes, a perfect hexagonal pore arrangement was obtained.


2010 ◽  
Vol 13 (11) ◽  
pp. C33 ◽  
Author(s):  
B. Gastón-García ◽  
E. García-Lecina ◽  
J. A. Díez ◽  
M. Belenguer ◽  
C. Müller

2014 ◽  
Vol 254 ◽  
pp. 398-401 ◽  
Author(s):  
Xiufang Qin ◽  
Jinqiong Zhang ◽  
Xiaojuan Meng ◽  
Lanfang Wang ◽  
Chenhua Deng ◽  
...  

Author(s):  
Екатерина Николаевна Муратова

Изучение оптических свойств наноразмерных мембран пористого анодного оксида алюминия позволяет значительно расширить области применения данного материала. В работе представлены результаты тепловизионных исследований мембран пористого анодного оксида алюминия с различными структурными параметрами. Построены профили распределения температуры для мембран, полученных в различных электролитах на основе серной, щавелевой и ортофосфорной кислотах. Установлено, что экранирование ИК излучения сильнее (примерно на 30%) проявляется у мембран с меньшим диаметром пор d ≈ 20 нм по сравнению с мембранами, у которых d ≈ 200 нм. Это связано с рассеиванием теплового излучения на неоднородностях структуры, которых значительно больше в мембранах пористого анодного оксида алюминия, полученных на серной кислоте. В качестве источников неоднородности выступают поры малого диаметра, недотравленные области и дефекты. Также, за счет повышенной активности серной кислоты по сравнению с другими используемыми кислотами большее количество анионов встраивается в структуру образца. Study of optical properties of nanoscale membranes of porous anodic alumina can significantly expand the scope of this material. The paper presents the results of thermal imaging studies of porous anodic alumina membranes with various structural parameters. Temperature distribution profiles for membranes obtained in various electrolytes based on sulfuric, oxalic and orthophosphoric acids have been constructed. It was found that the shielding of IR radiation is more pronounced (approximately 30 %) in membranes with a smaller pore diameter d ≈ 20 nm compared to membranes with a larger pore diameter d ≈ 200 nm. This is due to the scattering of thermal radiation on structural inhomogeneities, which are much higher in porous anodic alumina membranes obtained with sulfuric acid. Small-diameter pores, under-etched areas and defects act as sources of inhomogeneity. Also, due to the increased activity of sulfuric acid in comparison with other acids used, more anions are incorporated into the structure of the sample.


2012 ◽  
Vol 29 (6) ◽  
pp. 658
Author(s):  
Renjiang LV ◽  
Xuegong HOU ◽  
Yingjie LI ◽  
Lei DENG ◽  
Huimin DING ◽  
...  

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