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悬浮液滴中干燥行为的光散射分析,含有和聚乙烯颗粒以及水溶性聚合物

Yewon Lee¹, Seong Hwan Kim¹, Seong Jae Lee²

¹Department of Chemical and Biological Engineering, Korea University, Seoul 02841, Republic of Korea.

Langmuir : the ACS journal of surfaces and colloids

|November 17, 2023

概括

了解咖啡环在干燥滴中的作用对于均涂层至关重要. 光散射方法揭示了粒子移动性和聚合物相互作用如何影响这些模式,从而实现微观结构的控制.

科学领域:

合体和表面科学科学
材料科学材料科学材料科学
软物质物理学软物质物理学

背景情况:

咖啡环效应是一种常见的干燥模式,会显著影响涂层中的颗粒沉积均性.
控制这种现象对于需要均材料分布的应用至关重要.

研究的目的:

量化分析滴水蒸发过程中粒子移动性的时间变化.
研究聚合物添加剂对咖啡环形成和粒子动态的影响.
建立干燥动态,溶液相互作用和最终微观结构之间的相关性.

主要方法:

利用扩散波谱法 (DWS) 在早期干燥阶段测量特征性粒子移动性 (平均方位位移).
采用多光谱DWS (MSDWS) 来分析水滴边缘和中心的局部粒子动态.
将乙纤维素 (HEC) 纳入二氧化和聚烯 (PS) 悬浮液中,以研究聚合物-颗粒相互作用.

主要成果:

实时粒子移动性变化使用DWS和MSDWS进行了定量区分.
在干燥过程中,MSDWS提供了对不同滴滴区域内的局部粒子动态的见解.
添加HEC在调节咖啡环模式方面发挥了作用,受颗粒-聚合物相互作用的影响.

结论:

综合的光散射方法允许干燥的微观结构与实时干燥动态直接相关.
了解溶液相互作用,特别是聚合物-颗粒效应,是控制咖啡环模式的关键.
这项研究为通过受控的干燥过程设计均颗粒沉积物提供了一条途径.

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