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Representative scanning electron microscopic (SEM) images of uncoated absorbing pads (A) and absorbing pads coated with immobilized ZnO nanoparticles at 0.856 mg/cm2 (B). Coating was conducted using a sonication/ultrasound-assisted dipping technique for 5 min, followed by immersion in distilled water for three washes and drying at 80°C for 45 min. SEM accelerating voltage was 2.0 kV, and the magnification ranged from ×250 to ×5,000 (n = 7).
