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Dependent light scattering in white paint films: clarification and application of the theoretical concepts

机译:白漆膜中的相关光散射:理论概念的阐明和应用

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Among the numerous publications analyzing the causes and consequences of titanium dioxide crowding on the optical properties of white paint films, one notes some inconsistencies. First, a significant number of studies are inclined to describe "dependent" and "multiple" scattering of light as distinct phenomena. Second, the transition from independent to dependent light-scattering is often associated with an ill-defined "threshold" concentration. The aim of this study is to clarify the intricate connections between these two scattering regimes and in particular to show that for white paint films loaded with rutile titanium dioxide pigments, "dependent" light scattering is merely a particular manifestation of multiple scattering processes. We also clarify that the transition from independent to dependent scattering is a continuous process that cannot be formally related to a specific threshold in the pigment volume concentration. Finally, we propose a simple method based on the dependent scattering amplitude to assist paint formulators facing the task of improving the hiding power of a white paint either by increasing the quantity of pigments or by improving their spatial state of dispersion.
机译:在众多分析二氧化钛拥挤对白色漆膜光学性能的成因和后果的出版物中,有人指出了一些矛盾之处。首先,大量研究倾向于将光的“依赖”和“多重”散射描述为不同的现象。其次,从独立的光散射到依赖的光散射的转变通常与不确定的“阈值”浓度相关。这项研究的目的是阐明这两种散射方式之间的复杂联系,特别是表明对于负载金红石型二氧化钛颜料的白色漆膜,“依赖”光散射只是多重散射过程的一种特殊表现。我们还阐明,从独立散射到依赖散射的过渡是一个连续过程,不能与颜料体积浓度的特定阈值正式相关。最后,我们提出了一种基于相关散射幅度的简单方法,以帮助涂料配方师面对通过增加颜料量或改善其空间分散状态来提高白色涂料遮盖力的任务。

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