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胤煌科技-測Zeta電位為什么不能稀釋應用？

什么是Zeta電位？

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面位置的靜電勢1品率。Zeta電位(ζ)是由膠體中粒子與粒子間的相互作用造成的相貫通，因此它可以用來預(yù)測膠體體系里粒子聚集的穩(wěn)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(qū)域積極影響。Zeta電位指的是液體中滑動(dòng)面或者剪切面的電位自動化方案。在這個(gè)滑動(dòng)平面內(nèi)，當(dāng)液體在這個(gè)邊界外自由運(yùn)動(dòng)時(shí)越來越重要，它與粒子結(jié)合在一起線上線下。遠(yuǎn)離粒子的凈電勢(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(fù)電的粒子及其周圍的各種概念區(qū)域

PS：這個(gè)是另外的一種說法醒悟，但是要描述的內(nèi)容是一樣的數據顯示；

由于分散粒子表面帶有電荷而吸引周圍的反號(hào)離子，這些反號(hào)離子在兩相界面呈擴(kuò)散狀態(tài)分布而形成擴(kuò)散雙電層也逐步提升。根據(jù)Stern雙電層理論可將雙電層分為兩部分記得牢，即Stern層和擴(kuò)散層。Stern層定義為吸附在電極表面的一層離子（IHP or OHP）電荷中心組成的一個(gè)平面層重要的作用，此平面層相對(duì)遠(yuǎn)離界面的流體中的某點(diǎn)的電位稱為Stern電位更多可能性。穩(wěn)定層(Stationary layer) (包括Stern層和滑動(dòng)面slipping plane以內(nèi)的部分?jǐn)U散層) 與擴(kuò)散層內(nèi)分散介質(zhì)(dispersion medium)發(fā)生相對(duì)移動(dòng)時(shí)的界面是滑動(dòng)面(slipping plane)，該處對(duì)遠(yuǎn)離界面的流體中的某點(diǎn)的電位稱為Zeta電位或電動(dòng)電位（ζ-電位）足夠的實力。

測Zeta電位為什么不能稀釋緊迫性？

In aqueous media, Zeta potential is typically generated as the ions on the particle surface dissociate, leaving a net electric charge near the surface surrounded by a cloud of counter-ions. Various types of ions can diffuse in and out through the slipping plane which allows Zeta potential to vary depending on the ion composition in the liquid such as pH. Ions may also participate in chemical reactions within the slipping plane which can affect the Zeta potential. Sample dilution can significantly shift the Zeta potential as ions may adsorb or desorb from the particle. Thus, Zeta potential can be positive or negative, or zero (Iso-Electric Point, IEP) depending on the liquid (solvent) pH or ion type and concentration.

在水相介質(zhì)中，Zeta電位通常是由于粒子表面的離子離解而產(chǎn)生的多種場景，在表面附近留下一個(gè)被反離子云包圍的凈電荷多元化服務體系。各種類型的離子可以通過滑動(dòng)面擴(kuò)散進(jìn)來和出去，滑動(dòng)面允許Zeta電位根據(jù)液體中的離子組成而變化，例如pH值深度。離子也可以通過參與滑動(dòng)面內(nèi)的化學(xué)反應(yīng)全面展示，從而影響Zeta電位。樣品稀釋可以顯著地改變Zeta電位深刻認識，因?yàn)殡x子可以吸附或者解析顆粒核心技術。因此，Zeta電位可以是正的或負(fù)的主動性，也可以是零(等電點(diǎn)創造性，IEP)，這取決于液體(溶劑)的pH值或離子的類型和濃度道路。

測量Zeta電位的方法

Particle-filtration systems may benefit from low Zeta potential levels as aggregated particles are easier to remove. Most other colloidal systems require higher Zeta potentials, e.g. over +/- 20 millivolts in order to maximize shell life. Coatings tend to be more efficient when the particles and coated surface have opposite polarities. Zeta potential normally cannot be directly measured. For example, one cannot place a voltmeter probe against a particle surface in order to measure its surface potential. Instead, Zeta potential is calculated from electrophoretic measurements which measure particle velocity under an applied electric field, i.e. make the particles move and measure their particle mobility (see matec規模設備。。ｃｏｍ/mas). Thus, the calculated Zeta potential depends on the theory used in these computations to relate particle mobility to Zeta potential. An alternative measurement for large particles or surfaces is to move the liquid against stationary particles, fibers, or surfaces and measure the resulting streaming potential指導。

顆粒過濾系統(tǒng)可能受益于較低的Zeta電位水平競爭力，因?yàn)榫奂w粒更容易去除。大多數(shù)其他膠體系統(tǒng)需要較高的Zeta電位進一步完善，例如超過+/- 20毫伏集聚，以大限度地提高殼體壽命。當(dāng)顆粒和涂層表面具有相反的極性時(shí)調整推進，涂層往往更有效狀況。Zeta電位通常不能直接測量。例如機製，不能將伏特計(jì)探頭靠在粒子表面上以測量其表面電位全過程。相反，Zeta電位是通過電泳測量來計(jì)算的探討，電泳測量是在外加電場下測量粒子速度效果，也就是通過粒子移動(dòng)并測量其粒子遷移率（見yh-tek。合規意識。ｃｏｍ/mas）。因此有效性，計(jì)算出的Zeta電位取決于這些計(jì)算中使用的理論創新內容，即粒子遷移率與Zeta電位的關(guān)系。另一種測量大顆翉V泛關註；虮砻骐娢坏姆椒ㄊ菍⒁后w移到靜止的顆粒善於監督、纖維或表面上，然后測量產(chǎn)生的流動(dòng)電位就能壓製。