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Updated: Jun 24, 2025

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波数依赖的动态光散射光学连贯性断层扫描集体和自我扩散的测量

Konstantine Cheishvili, Rut Besseling, Michiel Hermes

|June 11, 2024

概括

我们展示了动态光散射光学连贯性断层扫描 (DLS-OCT) 如何测量悬浮中的扩散. 这种技术可以准确地确定颗粒大小和多分散性,即使是小颗粒.

科学领域:

体和接口科学科学
软物质物理学软物质物理学
光学测量技术的使用.

背景情况:

精确的粒子大小和多分散性特征在体科学中至关重要.
传统的方法,如动态光散射 (DLS) 有局限性,特别是聚散或缩样本.

研究的目的:

为了证明波数依赖的DLS-OCT用于测量缩悬浮中的集体和自我扩散系数.
建立DLS-OCT作为粒子大小和多分散性确定的一种多功能工具.
将DLS-OCT与既有理论和DLS方法进行比较.

主要方法:

使用定制自制和高速的Thorlabs OCT系统进行DLS-OCT测量.
在广泛的q范围进行波数依赖的测量.
在同时测量扩散系数时使用脱近似.
在自相关函数中推导多分散指数和模式幅度之间的关系.

主要成果:

集体扩散系数测量结果与硬球理论有很好的一致性.
使用集体扩散有效地实现了颗粒大小的确定.
同时测量集体和自我扩散系数是可能的,使得粒子大小和体积分数的确定没有波数依赖的测量在单分散悬浮.
开发了一种新的方法来测量基于粒子数的多分散度指数.
与标准的DLS累积分析相比,DLS-OCT多分散度测量显示对较小颗粒大小的灵敏度提高.

结论:

DLS-OCT是一种强大的技术,用于表征体悬浮液.
该方法提供了准确的颗粒大小和多分散性信息,在较小颗粒的灵敏度方面超过标准DLS.
波数依赖的DLS-OCT提供了全面的扩散分析,同时测量简化了单分散系统的表征.

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