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(a) XRR curves taken on gig-lox TiO2 layers soaked into solutions at increasing Pb concentrations. The progressively increasing amount of Pb captured by the sponge causes an increase in the θc values. A saturation is encountered at 4.7 ppm at the used sponge thickness (340 nm). (b) Critical angles as a function of the Pb captured by the sponge and measured by ICP-mass spectrometry. The linear fit has a slope of 6.93 × 10−4 (°cm2/μg) and an intercept of 0.25°.
