准二维模型用于预测干燥薄膜中的固体微结构
Jesse L Starger1, Aaron T Fafarman1, Jason B Baxter1
1Department of Chemical and Biological Engineering, Drexel University, Philadelphia, Pennsylvania 19104, United States.
Langmuir : the ACS journal of surfaces and colloids
|November 8, 2023
概括
这项研究模拟了薄膜涂层的形成,揭示了蒸发和面积比对微观结构有重大影响. 这些发现提供了一个优化溶液加工薄膜的过程图,包括化 PeroVskites.
科学领域:
- 材料科学 材料科学 材料科学
- 化学工程是化学工程的重要组成部分.
- 物理 物理学 物理
背景情况:
- 固体涂层的微观结构是由生长,溶解物扩散和溶剂蒸发的相互作用决定的.
- 了解这些合现象对于控制薄膜特性至关重要.
研究的目的:
- 开发一个数值模型,预测溶液加工薄膜的横向增长.
- 确定控制涂层质量的关键无维参数.
主要方法:
- 采用了准二维数值模型,将干燥和凝固过程结合起来.
- 该模型预测了相邻核的短暂横向增长.
- 分析了像Peclet数 (Pe) 和Biot数 (Bi) 这样的关键参数,这些参数被修改了面积比.
主要成果:
- 溶液和溶剂的侧向梯度会影响薄膜厚度和生长速度.
- 蒸发动态和面积比是涂层质量的主要决定因素.
- 建立了一个过程图,将修改后的生物质数 (Bi) 与涂层模式相关联.
结论:
- 该研究为了解和控制溶液加工中的薄膜形成提供了一个框架.
- 开发的过程地图适用于化烯矿,并可将其推广到其他薄膜系统.
- 优化蒸发和面积比是实现所需涂层微观结构的关键.
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