Scattering from colloidal cubic silica shells: Part II, static structure factors and osmotic equation of state.

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ID: 101318
2020
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Abstract
The shape of colloidal particles affects the structure of colloidal dispersions. The effect of the cube shape on the thermodynamics of colloidal cube dispersions has not yet been studied experimentally. Static light scattering measurements on colloidal cubic silica shells at finite concentrations allows us to measure the structure factor of colloidal cube fluids and to test theoretical predictions for the equation of state of hard convex superballs.Hollow silica nanocubes of varying concentrations in N,N,-dimethylformamide were studied with static light scattering. The structure factor was extracted from the scattering curves using experimental form factors. From this experimental structure factor, the specific density of the particles, and the osmotic compressibility were obtained. This osmotic compressibility was then compared to a theoretical equation of state of hard superballs.The first experimental structure factors of a stable cube fluid are presented. The osmotic compressibility of the cube fluid can be described by the equation of state of a hard superball fluid, showing that silica cubes in N,N,-dimethylformamide with LiCl effectively interact as hard particles.
Reference Key
dekker2020scatteringjournal Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors Dekker, F;Kuipers, B W M;González García, Á;Tuinier, R;Philipse, A P;
Journal Journal of colloid and interface science
Year 2020
DOI
S0021-9797(20)30210-1
URL
Keywords
colloidal cubic shells osmotic equation of state static light scattering static structure factor superballs

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