界達電位(zeta potential)在膠體化學中,是指膠體粒子上累積的離子所引發的靜電壓;膠體粒子由電雙層構成,包含固定層擴散層。一個粒子可以藉由亨利公式Henry's function)導出電泳的移動率,進而求出其界達電位的值。

改進型蓋伊-查普曼雙電層模型以及徑向電勢分佈曲線。

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