Figure 2.

Morphological characterization of the outer surface of APA prepared in 0.3 M oxalic acid.aResults of the AFM measurements: pore diameterdout(open circles), interpore distanceDout(filled circles), and surface RMS roughness values, for 10 μm scan size (filled squares).bContact angles θ measured in ambient air on the same APA surfaces, using either DI water (filled squares) or a 10% v/v aqueous solution of IL2 (open squares), respectively

Salerno et al. Nanoscale Research Letters 2009 4:865-872   doi:10.1007/s11671-009-9337-3