用于增强气溶胶分离的创新微分离器设计

IF 5.7 2区化学 Q1 CHEMISTRY, ANALYTICAL

Analytica Chimica Acta Pub Date : 2025-06-20 DOI:10.1016/j.aca.2025.344336

Pan Wang, Zhuo Gao, Changxing Li, Xiuli Gao, Jianlong Zhao, Shouqi Yuan, Shilun Feng

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引用次数: 0

摘要

虚拟冲击器是一种应用广泛且高效的气溶胶分离仪器。然而，微通道内的流场分布会影响虚拟冲击器的分离曲线，导致虚拟冲击器的分离曲线呈“S”型，而不是期望的阶梯状分布，这使得实现100%的颗粒分离效率变得不切实际。因此，在气溶胶分离检测领域，提高分离器的分离效率至关重要。结果采用微流控芯片设计了一种新型的微分离器，该微分离器将等腰三角形棱镜（tri-prism）置于喷嘴区域的上游，从而改进了传统的微分离器设计。这种设计允许喷嘴和分离区域内的速度分布从抛物线形状过渡到m形，其中峰值速度从中轴向两侧移动，而不是集中在中心。m型速度分布对提高颗粒收集效率起着至关重要的作用。通过数值模拟和实验测试评估了所提出的微分离器的性能改进，并将其与传统的虚拟冲击器在相同的操作条件和截止尺寸下进行了比较。结果表明，在截止尺寸为1.07 μm和0.79 μm时，我们的装置与传统的虚拟冲击器相比，亚临界颗粒含量与总颗粒含量（Csp）的比例分别降低了6.14%和6.698%。此外，该装置的亚临界颗粒（Rsp）减少率分别为31.37%和39.32%。意义基于微流控技术的微分离器可以提高气溶胶的分离效率。此外，它的便携性和易于集成为推进综合检测系统提供了巨大的潜力。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

Innovative Microseparator Design for Enhanced Aerosol Separation

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Innovative Microseparator Design for Enhanced Aerosol Separation

Background

The virtual impactor serves as a widely used and efficient instrument for aerosol separation. However, the flow field distribution within the microchannel influences the separation curve of the virtual impactor, resulting in an ‘S’-shaped profile rather than the desired step-shaped distribution, which makes achieving 100% particle separation efficiency impractical. Consequently, enhancing the separation efficiency of the separator is crucial in the field of aerosol separation and detection.

Results

We introduce an innovative microseparator, designed on a microfluidic chip, which incorporates an isosceles triangular prism (tri-prism) placed upstream of the nozzle region, thus enhancing the conventional design. This design allows the velocity distribution within both the nozzle and separation regions to transition from a parabolic shape to an M-shape, where the peak velocity shifts from the central axis to the sides, rather than remaining concentrated at the center. The M-shape velocity distribution plays a crucial role in improving the particle collection efficiency. The performance improvement of the proposed microseparator was assessed through numerical simulations and experimental tests, comparing it to the conventional virtual impactor under identical operational conditions and cut-off sizes. As a result, at cut-off sizes of 1.07 μm and 0.79 μm, our device showed reductions of 6.14% and 6.698% in the ratio of subcritical particle content to total particle content (C_sp) compared to the conventional virtual impactor, respectively. Additionally, reductions in subcritical particles (R_sp) for the proposed device were 31.37% and 39.32%, respectively.

Significance

The proposed microseparator, based on microfluidic technology, can improve the aerosol separation efficiency. Moreover, its portability and ease of integration provide significant potential for advancing integrated detection systems.

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来源期刊

Analytica Chimica Acta 化学-分析化学

CiteScore

10.40

自引率

6.50%

发文量

1081

审稿时长

38 days

期刊介绍： Analytica Chimica Acta has an open access mirror journal Analytica Chimica Acta: X, sharing the same aims and scope, editorial team, submission system and rigorous peer review. Analytica Chimica Acta provides a forum for the rapid publication of original research, and critical, comprehensive reviews dealing with all aspects of fundamental and applied modern analytical chemistry. The journal welcomes the submission of research papers which report studies concerning the development of new and significant analytical methodologies. In determining the suitability of submitted articles for publication, particular scrutiny will be placed on the degree of novelty and impact of the research and the extent to which it adds to the existing body of knowledge in analytical chemistry.