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Variations of DAP surface morphology before and after treatment; (A1): non-treatment (500 magnification, resolution: 1536 × 1094); (A2) ultrasonic treatment (500 magnification, resolution: 1536 × 1094); (A3): microwave treatment (120 magnification, resolution: 1536 × 1094); (A4): microwave–ultrasonic treatment (500 magnification, resolution: 1536 × 1094); (A5): ultrasonic–microwave treatment (500 magnification, resolution: 1536 × 1094).
