Fig. 2From: Silica-titania xerogel doped with Mo,P-heteropoly compounds for solid phase spectrophotometric determination of ascorbic acid in fruit juices, pharmaceuticals, and synthetic urineSEM images of the xerogels surface: a Ti12.5HPC0, b Ti0HPC20, c Ti5HPC20, d Ti12.5HPC20 (see Table 1 for xerogel names)Back to article page