Fig. (3) Robust madurahydroxylactone coatings on zirconium beads. Zirconium dioxide beads of 1mm diameter were dip coated using madurahydroxylactone dissolved in DMSO at 100 mg/ml (A), 10mg/ml (B), 1mg/ml (C), DMSO (D) and dried at ambient temperature. The scale bar corresponds to 0.2 mm.