多功能胶体演示仪的制作及胶体性质的探究

Fabrication of the multi-functional colloid demonstratorand colloid properties

设计了胶体性质实验演示装置,可同时演示胶体的电泳现象、吸附现象和丁达尔效应.采用倒Y型三通管进行电泳实验,探究胶体电泳现象的速率,加快演示进度并有效节省物料.将吸附装置放在暗箱中,用荧光粉替代杂质颗粒,探究明矾溶于水后生成Al(OH)3胶体对不同尺寸颗粒杂质的吸附能力,直观展现胶体吸附杂质的全过程.使用旋转表盘演示丁达尔效应,同时定性探究同种波长激光照射不同种类、不同浓度的胶体产生丁达尔效应的强弱.

The multi-functional colloid demonstrator was designed,which could demonstrate electrophoresis,adsorbability and Tyndall effect simultaneously.The electrophoretic rate of colloid was investigated by using an inverted Y-shaped tube.The adsorption device was placed in a dark box,where the impurity particles were replaced by the phosphor,the adsorption capacity of Al(OH)3 colloid for different-size granular impurities was explored.And the whole process of colloid adsorption could be visualized.A rotating dial plate was used to demonstrate the Tyndall effect,and the intensity of the Tyndall effect produced by the same wavelength laser according to different kinds and different concentrations of colloid was investigated qualitatively.