AN INVESTIGATION ON WETTABILITY MECHANISM OF ANODIC ALUMINUM OXIDE SURFACE WITH ORDERED NANOPORE ARRAYS

Based on anodic aluminum oxide（AAO） films with ordered nanopore arrays prepared by using an electrochemical two-step anodization method,the wettability of these structured and chemically heterogeneous surfaces was studied via employing bidistilled water and 1,2-dichloroethane as testing liquid.It is indicated that,with increase of nanopore diameter,contact angles of the two kinds of liquid are increased gradually.Using Owens′s and Yang′s methods,the composition of solid surface energy for AAO film was analysed.It is found that the contributions of surface nanostructure and surface chemical component are about 90% and 10% respectively.Obviously,the increased nanopore diameter leads to change surface energy,further obtains the variation in wettability.This work is very beneficial to understand the wetting mechanism induced cooperatively by nanostructure and chemical component.