Coupled evanescent field molecular tagged velocimetry for nanofluidics

用于纳米流体的耦合倏逝场分子标记测速

• 批准号: 389482-2010
• 负责人: Mitra, SushantaKumar
• 金额: $ 1.82万
• 依托单位: University of Alberta
• 依托单位国家: 加拿大
• 项目类别: Research Tools and Instruments - Category 1 (<$150,000)
• 财政年份: 2009
• 资助国家: 加拿大
• 起止时间: 2009-01-01 至 2010-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=442927
• 关键词: Coupled; evanescent; field; molecular; tagged

The instrument requested in this proposal relates to an innovative non-intrusive flow measurement technique for micro/nano-scale devices which combines the molecular tagging velocimetry (MTV) with evanescent wave field. This will allow us to quantify the velocity field within a few hundred nanometers (nm) from the channel walls where phenomena like slip, wall charge interactions, etc. are dominant. Such velocity measurements will be important to validate the theoretical models for the near wall phenomena and will substantially improve our understanding of fluid flow in micro and nanochannels. Existing techniques rely on seed particles which are typically around 100 - 200 nm in diameter and hence are not able to accurately resolve the flow field at the wall. By using the proposed evanescent wave field, a phenomenon which is confined within a few hundred nanometers of the investigated surface and relies on the total internal reflection of the light source, in conjunction with the existing MTV system will allow us to resolve such flow fields. This coupling will be rendered by procuring a high numerical aperture objective and related optics and beam steering mechanisms, which will then be integrated with the existing "in-house" developed MTV system, thereby creating a unique measurement technique for microfluidics applications.

本方案中所要求的仪器涉及一种创新的微/纳米设备的非侵入式流量测量技术，该技术将分子标记测速技术(MTV)与逝去波场相结合。这将使我们能够量化距离沟道壁几百纳米(Nm)内的速度场，在那里滑移、壁电荷相互作用等现象占主导地位。这样的速度测量对于验证近壁现象的理论模型是重要的，并将大大提高我们对微通道和纳米通道中流体流动的理解。现有的技术依赖于直径通常在100-200 nm左右的种子颗粒，因此不能准确地解析壁面的流场。通过使用所提出的消逝波场，一种被限制在被研究表面几百纳米范围内并且依赖于光源的全内反射的现象，与现有的MTV系统相结合，将使我们能够解析这样的流场。这种耦合将通过采购高数值孔径物镜以及相关的光学和光束控制机构来实现，然后这些机构将与现有的“内部”开发的MTV系统集成在一起，从而为微流体应用创造一种独特的测量技术。