来自胶体立方二氧化硅壳层的散射：第二部分，静态结构因子和渗透压状态方程。
Scattering from colloidal cubic silica shells: Part II, static structure factors and osmotic equation of state.
作者信息
Dekker F, Kuipers B W M, González García Á, Tuinier R, Philipse A P
机构信息
Van't Hoff Laboratory for Physical and Colloid Chemistry, Debye Institute for Nanomaterials Science, Padulaan 8, 3584 CH, Utrecht University, the Netherlands.
Van't Hoff Laboratory for Physical and Colloid Chemistry, Debye Institute for Nanomaterials Science, Padulaan 8, 3584 CH, Utrecht University, the Netherlands; Laboratory of Physical Chemistry, Department of Chemical Engineering and Chemistry & Institute for Complex Molecular Systems, Eindhoven University of Technology, P.O. Box 513, 5600 MB, Eindhoven, the Netherlands.
出版信息
J Colloid Interface Sci. 2020 Jul 1;571:267-274. doi: 10.1016/j.jcis.2020.02.058. Epub 2020 Feb 29.
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.
假设
胶体颗粒的形状会影响胶体分散体系的结构。立方体形状对胶体立方体分散体系热力学的影响尚未经过实验研究。对有限浓度下的胶体立方二氧化硅壳进行静态光散射测量，使我们能够测量胶体立方体流体的结构因子，并检验硬凸超球状态方程的理论预测。
实验
使用静态光散射研究了在N，N-二甲基甲酰胺中不同浓度的空心二氧化硅纳米立方体。利用实验形状因子从散射曲线中提取结构因子。从该实验结构因子中，获得了颗粒的比密度和渗透压缩性。然后将该渗透压缩性与硬超球的理论状态方程进行比较。
研究结果
给出了稳定立方体流体的首个实验结构因子。立方体流体的渗透压缩性可用硬超球流体的状态方程来描述，这表明在含有LiCl的N，N-二甲基甲酰胺中的二氧化硅立方体作为硬颗粒有效相互作用。
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