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Figure 6
Comparison of g2(q, t) functions (for q values indicated in the legend) measured with the Eiger 500k and Pilatus 300k detectors when colloids are undergoing diffusive and advective motions. The left-hand panels correspond to diffusive dynamics below the phase separation temperature of the solvent and the solid red lines represent fit curves to equation (2)[link] with D0 values of (a) 0.61 µm2 s−1 and (b) 0.70 µm2 s−1. The right-hand panels present the change to predominantly advective dynamics during the phase separation of the solvent and the corresponding Γ(q) incorporates both advective and diffusive terms (Dattani et al., 2017BB5). The resulting fit parameters are (c) D0 ≃ 0.63 µm2 s−1 and Δv ≃ 11.3 µm s−1, and (d) D0 ≃ 0.63 µm2 s−1 (fixed) and Δv ≃ 22.8 µm s−1. The insets in panels (b) and (d) present the q dependence of Γ(q) in the diffusive and advective cases.

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