An impregnation method for supported nanometal catalyst preparation [40] was applied to obtain HEMA-impregnated ZrO2 MARIMO filler. ZrO2 MARIMO was dried at 80 °C under vacuum for 12 h. Then, 20 μL of a HEMA/HCPK (20/1, mol/mol) mixture was added to 200 mg of vacuum-dried ZrO2 MARIMO, and the mixture was manually mixed well with a mortar and pestle. It was then irradiated with UV light for 1 h with intermittent mixing every 15 min. Similar procedures were used to prepare NIPAM-, BMA-, and CHMA-impregnated ZrO2 MARIMO fillers.
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