Characterization of the Scattering and Absorption of Colored Zein Colloids in Optically Dense Dispersions
Characterization of the Scattering and Absorption of Colored Zein Colloids in Optically Dense Dispersions
复制标题
光学致密分散体中彩色玉米醇溶蛋白胶体的散射和吸收的表征
作者：
F. Y. de Boer;R. J. V. van Dijk;A. Imhof;K. Velikov
在这项研究中，我们使用多重光散射理论的结果模拟染色和未染色的玉米醇溶蛋白颗粒的光学致密胶体分散体的颜色。这些颗粒，以及单分散二氧化硅胶体，合成和表征，以获得颗粒的性质，如粒径，粒径分布，折射率，和吸收光谱的染料。该信息被用来模拟集中的颗粒分散体，这是使用一个专门设计的可变路径长度的石英玻璃比色皿测量的漫透射。对于非吸收性二氧化硅分散体，获得了在整个可见光范围内的传输平均自由程。结果表明，使用单粒子属性作为输入的多重散射模型计算的值的差异小于5%。对于未染色的玉米醇溶蛋白颗粒，其为灰白色，模型和实验之间的偏差约为30%，因为在低于550 nm的波长处有轻微吸收，但在更高的波长处<7%。从这些结果中，可以得出结论，该模型正确地描述了漫透射，并且测量对吸收敏感。最后，将该方法应用于染色玉米醇溶蛋白颗粒的分散体。在这里，传输平均自由程首先确定的波长，在没有吸收，这符合理论优于4%。然后使用模型化的传输平均自由程提取可见光谱的其余部分中的倒数吸收平均自由程，并且获得与染料溶液的吸收光谱的合理一致性。
In this research, we model the color of optically dense colloidal dispersions of dyed and undyed zein particles using results from multiple light scattering theory. These particles, as well as monodisperse silica colloids, were synthesized and characterized to obtain particle properties such as particle size, particle size distribution, refractive index, and absorption spectrum of the dye. This information was used to model the diffuse transmission of concentrated particle dispersions, which was measured using a specially designed variable path length quartz glass cuvette. For the nonabsorbing silica dispersions, a transport mean-free path throughout the visible range was obtained. Results showed a difference of less than 5% from the values calculated with a multiple scattering model using the single-particle properties as an input. For undyed zein particles, which are off-white, the deviation between the model and the experiment was about 30% because of slight absorption at wavelengths below 550 nm but <7% at higher wavelengths. From these results, it was concluded that the model correctly describes diffuse transmission and that the measurements are sensitive to absorption. Finally, this method was applied to dispersions of dyed zein particles. Here, the transport mean-free path was first determined for wavelengths at which there is no absorption, which agreed with the theory better than 4%. The modeled transport mean-free path was then used to extract the reciprocal absorption mean-free path in the remaining parts of the visible spectrum, and a reasonable agreement with the absorption spectrum of the dye solution was obtained.
影响因子：
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作者：
Huang T;Nancy Xu XH
通讯作者：
Nancy Xu XH