基于流体弹性增强绝缘体的薄电泳,用于在非常稀释的聚合物溶液中聚焦无薄膜颗粒
Mahmud Kamal Raihan1, Micah Baghdady1, Heston Dort1
1Department of Mechanical Engineering, Clemson University, Clemson, South Carolina 29634, United States.
Analytical chemistry
|October 19, 2023
概括
将聚乙烯氧化物 (PEO) 聚合物添加到缓冲溶液中,可显著降低微流体中颗粒聚焦所需的电场. 这种流体弹性增强的绝缘体基电介电泳 (E-iDEP) 随着更高的PEO分子量和粒子大小而得到改善.
科学领域:
- 微流体学 微流体学
- 生物物理学的生物物理.
- 聚合物科学 聚合物科学
背景情况:
- 颗粒聚焦对于微流体应用,如流动细胞计和细胞分类至关重要.
- 压电电泳 (DEP) 方法通常用于微通道中的粒子操纵.
- 基于绝缘器的电介电泳 (iDEP) 为粒子操纵提供了一种无标签的方法.
研究的目的:
- 为了研究聚乙烯氧化物 (PEO) 聚合物添加对微流体器件中聚焦的介电离子粒子的影响.
- 探索流体弹性的作用,以增强基于绝缘体的电介电泳 (iDEP).
- 为了确定PEO分子量,颗粒大小和度对颗粒聚焦效率的影响.
主要方法:
- 利用微流体设备,使用狭窄的通道来处理颗粒.
- 在缓冲溶液中引入不同度和分子量的聚乙烯氧化物 (PEO).
- 应用直流电场来诱导用于粒子聚焦的介电泳力.
- 进行理论分析,以建模流体弹性对电动力学和电电泳学粒子运动的影响.
主要成果:
- 添加PEO显著降低了单线粒子聚焦所需的DC电场值,近一个数量级.
- 基于弹性增强绝缘体的颗粒聚焦效率 (E-iDEP) 随着更高的PEO分子量和更大的颗粒大小而增加.
- 理论分析支持观察到的趋势,将改善归因于流体弹性效应.
- 颗粒聚焦效率与PEO度有非单调的关系,最初增加,然后减少.
结论:
- 通过稀释PEO溶液增强的流体弹性,有效地改善了微流体狭窄通道中的介电电泳粒子聚焦.
- E-iDEP为低场粒子操纵提供了一个有前途的方法,其性能可以根据PEO分子量和粒子特征进行调整.
- E-iDEP 的度依赖性行为表明一个最佳的 PEO 度范围,以最大限度地提高粒子聚焦效率.
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