不同浓度条件下液溶胶丁达尔现象的研究

Tyndall Phenomenon of Colloidal Sol Under Different Concentrations

为了研究液溶胶物质的量浓度对丁达尔现象的影响，利用红色激光对不同浓度氢氧化铁液溶胶中形成的光路进行拍照，采用HSV色彩模式对9种浓度条件下的图像进行分析。结果表明，色调和饱和度与光路的沿程位置无关，强度值与光路的沿程位置相关，当液溶胶浓度为0．0846-0．0617mol／l。时，强度值沿光线方向全程衰减，其衰减程度与液溶胶浓度成正比；当液溶胶浓度为0．0555-0．0364mol／L时，强度值沿光线方向先衰减后提升。色调和饱和度均值与液溶胶的浓度相关，具有阶段性。强度值均值随着浓度的降低呈现降低、升高、再降低的趋势，峰值点在浓度值为0．0405mol／L处，谷值点在浓度值为0．0617mol／L处。

In order to investigate the effect of amount-of-substance concentration of colloidal sol on Tyndall phenomenon, the red laser was adopted to form the optical paths at nine concentrations of ferric hydroxide colloid. HSV color mode was used to analyze the images of optical paths. The results showed that the hue and saturation had no relation to the process position of optical paths, on which the intensity value was dependent. Intensity values always decayed along with optical paths when the concentration of colloidal solution was in the range of 0. 0846 0. 0617 mol/L, and the degree of decaying was proportional to the concentration. However, the intensity values firstly decayed and then elevated along with optical paths when the concentration of colloidal solution was in the range of 0. 0555--0. 0364 mol/L. The interdependency was periodical between average value of hue and saturation and concentrations of colloidal sol. The variation trend of mean intensity value was reducing, rising and reducing again with the decrease of concentration, and the peak value and valley value of mean intensity value emerged at 0. 0405 mol/L and 0. 0617 mol/L respectively.