Zeta電位的介紹
Zeta potential is an electrostatic potential that exists very near the surface of particles suspended in liquids1. Zeta potential (ζ) is responsible for particle-particle repulsion forces in colloidal suspensions and thus can be used to predict colloid stability against particle aggregation. Figure 1 illustrates a particle suspended in a liquid along with various notional regions around it. The“slipping plane” or “shear plane” is where Zeta potential is located versus the potential in the bulk solution. Within this slipping plane, the liquid is bound to the particle while it moves freely outside this boundary. The net potential far from the particle (in the bulk of the liquid) is zero.
Zeta電位是液體中懸浮的粒子很接近表麵位置的靜電勢1.Zeta電位(ζ)是由膠體中粒子與粒子間的相互作用造成的,因此它可以用來預測膠體體係裏粒子聚集的穩定性。圖1顯示了懸浮在液體中的粒子及其周圍的各種概念區域。Zeta電位指的是液體中滑動麵或者剪切麵的電位。在這個滑動平麵內,當液體在這個邊界外自由運動時,它與粒子結合在一起。遠離粒子的淨電勢(在液體中)為零。
Figure 1. A negatively charged particle suspended in a liquid. Notional boundaries are shown.
圖1懸浮在液體中的帶負電的粒子及其周圍的各種概念區域
PS:這個是另外的一種說法,但是要描述的內容是一樣的;
由於分散粒子表麵帶有電荷而吸引周圍的反號離子,這些反號離子在兩相界麵呈擴散狀態分布而形成擴散雙電層。根據Stern雙電層理論可將雙電層分為兩部分,即Stern層和擴散層。Stern層定義為吸附在電極表麵的一層離子(IHP or OHP)電荷中心組成的一個平麵層,此平麵層相對遠離界麵的流體中的某點的電位稱為Stern電位。穩定層(Stationary layer) (包括Stern層和滑動麵slipping plane以內的部分擴散層) 與擴散層內分散介質(dispersion medium)發生相對移動時的界麵是滑動麵(slipping plane),該處對遠離界麵的流體中的某點的電位稱為Zeta電位或電動電位(ζ-電位)。
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