界達電位

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，包含固定層和擴散層。一個粒子可以藉由亨利公式（）導出電泳的移動率，進而求出其界達電位的值。

U_{e}={\frac {2\varepsilon \zeta f(ka)}{3\eta }}

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