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- W2022183731 abstract "The effect of concentration on the structure of SnO 2 colloids in aqueous suspension, on their spatial correlation and on the gelation process was studied by small angle x-ray scattering (SAXS). The shape of the experimental SAXS curves varies with suspension concentration. For diluted suspensions ([SnO 2 ] ≤ 0.13 mol L −1 ), SAXS results indicate the presence of colloidal fractal aggregates with an internal correlation length ξ ≃ 20 Å, without any noticeable spatial correlation between them. This suggests that the aggregates are spatially arranged without any significant interaction like in ideal gas structures. For higher concentrations ([SnO 2 ] = 0.16, 0.32, and 0.64 mol L −1 ), the colloidal aggregates are larger (ξ = 24 Å) and exhibit a certain degree of spatial correlation between them. The pair correlation function corresponding to the sol with the highest concentration (0.92 mol L −1 ) reveals a rather strong short range order between aggregates, characteristic of a fluid-like structure, with an average nearest-neighbor distance between aggregates d 1 = 125 Å and an average second-neighbor distance d 2 = 283 Å. The pair distribution function remains essentially invariant during the sol-gel transition, suggesting that gelation involves the formation of a few points of connection between the aggregates resulting in a gel network constituted by essentially linear chains of clusters." @default.
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- W2022183731 date "2000-06-01" @default.
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- W2022183731 title "Sol phase and sol–gel transition in SnO<sub>2</sub> colloidal suspensions" @default.
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