Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Use of Ionic Liquid in Fabrication, Characterization, and Processing of Anodic Porous Alumina | Nanoscale Res Lett 2009 4 865-872 DOI S11671-009-9337-3 NANO EXPRESS Use of Ionic Liquid in Fabrication Characterization and Processing of Anodic Porous Alumina Marco Salerno Niranjan Patra Roberto Cingolani Received 19 February 2009 Accepted 24 April 2009 Published online 8 May 2009 to the authors 2009 Abstract Two different ionic liquids have been tested in the electrochemical fabrication of anodic porous alumina in an aqueous solution of oxalic acid. It was found that during galvanostatic anodization of the aluminum at a current density of 200 mA cm2 addition of relative volume concentration of 1-butyl-3-methylimidazolium tetrafluoborate resulted in a three-fold increase of the growth rate as compared to the bare acidic solution with the same acid concentration. This ionic liquid was also used successfully for an assessment of the wettability of the outer surface of the alumina by means of liquid contact angle measurements. The results have been discussed and interpreted with the aid of atomic force microscopy. The observed wetting property allowed to use the ionic liquid for protection of the pores during a test removal of the oxide barrier layer. Keywords Porous alumina Anodization Galvanostatic Ionic liquids Wettability Roughness Introduction Anodic porous alumina APA 1-4 also called porous anodic alumina PAA 5-9 anodic aluminum oxide AAO 10 11 or alumite 12 13 is a form of Al2O3 which is deposited onto an aluminum Al foil working as the positively biased pole of an electrolytic cell 14-16 . Whereas in basic or neutral electrolytes ELs a compact alumina layer is grown called barrier layer in acidic M. Salerno El N. Patra R. Cingolani Nanobiotechnology Department The Italian Institute of Technology via Morego 30 Genova 16163 Italy e-mail ELs that can dissolve the oxide a porous alumina layer is grown on top of a thin 10-100 nm 17 barrier-type layer. Depending on the applications pore ordering in APA can be necessary either on .
