含多分散、光学非均匀颗粒的稠密分散体系的可测量结构因子
Measurable Structure Factors of Dense Dispersions Containing Polydisperse, Optically Inhomogeneous Particles
AI总结：
研究多分散光学非均匀颗粒体系中单个散射体光学性质对可测量结构因子的影响，指出加权偏结构因子与实测S_M(Q)存在非结构性偏差，需结合尺寸分布与光学性质谨慎分析。
摘要：
我们示例性地研究了相互作用多粒子系统中单个散射体的光学性质如何影响可测量结构因子。散射长度密度呈线性梯度的颗粒以及核壳结构颗粒，都会在多组分系统中偏结构因子的加权和⟨S(Q)⟩与实验可获得、可测量的结构因子S_M(Q)之间引起特征性偏差。⟨S(Q)⟩仅包含自组织系统的结构信息，而S_M(Q)还会受到其组成颗粒光学性质的影响，从而产生振幅变化、低波矢区域额外峰或高阶极大值分裂等与结构原因无关的特征。因此，为避免对可测量结构因子产生误读，必须针对单个散射体的尺寸分布和光学性质进行细致的数据分析。
英文摘要：
We exemplarily investigate how optical properties of single scatterers in interacting multi-particle systems influence measurable structure factors. Both particles with linear gradients of their scattering length density and core-shell structures evoke characteristic deviations between the weighted sum $\langle S(Q)\rangle$ of partial structure factors in a multicomponent system and experimentally accessible, measurable structure factors $S_{\mathrm{M}}(Q)$. While $\langle S(Q)\rangle$ contains only structural information of self-organising systems, $S_{\mathrm{M}}(Q)$ additionally is influenced by optical properties of their constituents resulting in features such as changing amplitudes, additional peaks in the low wavevector region or splitting of higher-order maxima which are not related to structural reasons. Hence, a careful data analysis regarding size-distribution and optical properties of single scatters is mandatory to avoid a misinterpretation of measurable structure factors.
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