Colloidal assembly of polydisperse particle blends during drying.,Soft Matter

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Colloidal assembly of polydisperse particle blends during drying.
Soft Matter ( IF 2.9 ) Pub Date : 2020-08-17 , DOI: 10.1039/d0sm00785d
Yichen Dong ₁ , Nicolas Busatto ₂ , Peter J Roth ₂ , Ignacio Martin-Fabiani ₁

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In this work, we synthesize a polydisperse aqueous colloidal system composed of small and large zwitterionic particles, as well as medium sized standard acrylic particles. By assembling these dispersions into films by drying, we show using atomic force microscopy (AFM) how their top surfaces can be mostly covered by zwitterionic groups for a wide range of evaporation rates. We probe underneath the top film surface using Fourier-transform infrared (FTIR) spectroscopy – attenuated total reflection (ATR), observing that the content in zwitterionic particles of the film upper layer increases for faster evaporation rates. We show how polydisperse systems hold great potential to overcome the evaporation rate dependence of size segregation processes in drying colloidal blends, and we provide further insights into the assembly mechanisms involved. Polydisperse blends enhance the robustness of such processes for application in coatings and other soft products where evaporation rate can not be tuned.

中文翻译：

干燥过程中多分散颗粒共混物的胶体组装。

在这项工作中，我们合成了由大小两性离子颗粒以及中型标准丙烯酸颗粒组成的多分散水性胶体体系。通过干燥将这些分散体组装成薄膜，我们使用原子力显微镜（AFM）展示了如何在宽范围的蒸发速率下将两性离子基团覆盖其顶面。我们使用傅立叶变换红外（FTIR）光谱–衰减全反射（ATR）在薄膜的顶部表面下进行探测，观察到薄膜上层的两性离子颗粒中的含量增加，以加快蒸发速度。我们展示了多分散体系如何具有巨大的潜力来克服干燥胶体共混物中尺寸分离过程的蒸发速率依赖性，并且我们提供了对涉及的组装机理的进一步见解。

更新日期：2020-09-23

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