Measurable Structure Factors of Dense Dispersions Containing Polydisperse, Optically Inhomogeneous Particles
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| Format: | Preprint |
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2024
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| _version_ | 1866909160890695680 |
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| author | Maier, Joel Diaz Gaus, Katharina Wagner, Joachim |
| author_facet | Maier, Joel Diaz Gaus, Katharina Wagner, Joachim |
| contents | 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. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2404_03470 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Measurable Structure Factors of Dense Dispersions Containing Polydisperse, Optically Inhomogeneous Particles Maier, Joel Diaz Gaus, Katharina Wagner, Joachim Soft Condensed Matter 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. |
| title | Measurable Structure Factors of Dense Dispersions Containing Polydisperse, Optically Inhomogeneous Particles |
| topic | Soft Condensed Matter |
| url | https://arxiv.org/abs/2404.03470 |