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SEM images of untreated OPMF (a-i), SEM mapping of untreated OPMF (a-ii), microanalysis spectrum of untreated OPMF indicate the particle is silica (a-iii), SHS-treated OPMF at 190 °C (b-i & ii), 210 °C (c-i & ii) and 230 °C (d-i & ii) for 1 h, show reduction of silica bodies after SHS treatment.
