a decreasing trendp < 0.05
With the increase of ultrasonic power, the absolute values of TUEP and UEP ζ-potential showed a decreasing trend (p < 0.05), from 32.7 to 28.7 mV and 35.4 to 31.9 mV, respectively, and the absolute values of UEP ζ-potential were higher than that of TUEP.