用光学连贯性断层扫描测量合体悬浮物的干燥动力学
Kohei Abe1,2, Patrick Saul Atkinson3, Chi Shing Cheung3
1Graduate School of Bio-Application and Systems Engineering, Tokyo University of Agriculture and Technology, 2-24-16 Naka-Cho, Koganei, Tokyo, 184-8588, Japan.
Soft matter
|February 20, 2024
概括
光学连贯性断层扫描 (OCT) 提供了一种观察体悬浮液干燥过程的新方法. 这种技术揭示了粒子度和运动如何影响薄膜形成,为材料特性提供了洞察力.
科学领域:
- 材料科学 材料科学 材料科学
- 物理化学 物理化学
- 流体动力学 流体动力学
背景情况:
- 体悬浮被广泛用于涂料中,在干燥后形成固体薄膜.
- 在薄膜形成过程中观察动态过程是具有挑战性的.
- 了解这些动态对于控制涂层特性至关重要.
研究的目的:
- 为了证明光学连贯断层扫描 (OCT) 在无接触,现场监测干燥体悬浮物的实用性.
- 描述薄膜形成过程中粒子度和结构的演变.
- 调查影响诱导时间和最终薄膜性能的因素.
主要方法:
- 使用扫描迈克尔森干扰仪与宽带激光用于OCT成像.
- 在Hele-Shaw细胞中实现了高分辨率 (10微米横向,1.8微米深) 的交叉截面成像,对合体二氧化干燥.
- 校准的OCT图像用于量化粒子度概况的时间和空间.
- 结合OCT与光学显微镜和粒子追踪进行全面分析.
主要成果:
- 成功地描述了干燥环状悬浮液中的动态,具有高空间和时间分辨率.
- 量化了干燥过程中的合颗粒度变化.
- 观察了干燥前线的发展,并确定了固体薄膜形成的诱导时间.
- 确定了在干燥前线附近的密度驱动的循环,作为延迟薄膜形成的因素.
结论:
- OCT是研究干燥体悬浮物的复杂动态的一个强大的工具.
- 这些发现为传输特性提供了洞察力,例如集体扩散对粒子度的依赖性.
- 了解扩散,蒸发和流体运动之间的相互作用是控制涂层形成和性能的关键.
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