TY - JOUR

T1 - Scattering from colloidal cubic silica shells

T2 - part II, static structure factors and osmotic equation of state

AU - Dekker, F.

AU - Kuipers, B. W.M.

AU - González García, García

AU - Tuinier, R.

AU - Philipse, A.P.

PY - 2020/7/1

Y1 - 2020/7/1

N2 - Hypothesis: 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. Experiments: 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. Findings: 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.

AB - Hypothesis: 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. Experiments: 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. Findings: 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.

KW - Colloidal cubic shells

KW - Osmotic equation of state

KW - Static light scattering

KW - Static structure factor

KW - Superballs

UR - http://www.scopus.com/inward/record.url?scp=85082021206&partnerID=8YFLogxK

U2 - 10.1016/j.jcis.2020.02.058

DO - 10.1016/j.jcis.2020.02.058

M3 - Article

C2 - 32203763

AN - SCOPUS:85082021206

VL - 571

SP - 267

EP - 274

JO - Journal of Colloid and Interface Science

JF - Journal of Colloid and Interface Science

SN - 0021-9797

ER -