Electrowetting-Tuned Liquid Droplets on Lubricated Superhydrophobic Surfaces for Whispering-Gallery-Mode Sensing

用于耳语画廊模式传感的润滑超疏水表面上的电润湿调谐液滴

• 批准号: 1808931
• 负责人: Jiangtao Cheng
• 金额: $ 32.27万
• 依托单位: Virginia Polytechnic Institute and State University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2018
• 资助国家: 美国
• 起止时间: 2018-09-01 至 2023-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1808931&HistoricalAwards=false
• 关键词: Electrowetting; Tuned; Liquid; Droplets; Lubricated

Miniaturized, portable, sensitive, and low cost sensing systems are important for medical and environmental diagnostic and monitoring applications. Chip scale integrated photonic sensing systems that combine optical, electrical, and fluidic functions are especially attractive for sensing applications due to the high sensitivity of optical sensors, the small form-factor of chip scale systems, and the low-cost processing possible for systems fabricated with well-developed mass production techniques. While optical sensing with a detection limit down to single nanoparticles has been achieved by various methods, such as scattering interferometric and photothermal microscopy and nanofiber sensors, microcavity sensing attracts much attention because their high quality factors (Q factor, which physically represents the rate of energy loss relative to the total stored energy) and small mode volumes enable significant enhancement of light-matter interactions. Microcavity sensing has seen tremendous progress and the sensing performance has been demonstrated by detecting single nanoparticles and single biological molecules. However, detection in liquids with whispering gallery mode (WGM, i.e., closed circular beams supported by total internal reflections at the external cavity interface) cavities was achieved only in rare cases using dielectric micro-resonators that were immersed or filled with liquids in a closed environment. No real and stable high Q-factor sensing experiment with non-solid optical resonators has been reported to date. In this program, the team formed at Virginia Tech aims to perform optical sensing with micro-resonators made directly of liquid droplets. New research outcomes from this project will be integrated with educational endeavors. Bio-inspired nanoscience and mechanical engineering will be integrated with all levels of K-12 education. Participation in the proposed researches will motivate the underrepresented groups for advanced degrees. In addition to graduate students, undergraduate and female students will participate in the research through thesis, project-based courses, or multidisciplinary senior design projects.The research objective of this project is to assist in realizing on-chip detection and sizing systems with ultra-high sensitivity and Q-factor, laying the groundwork to investigate the properties and dynamics of single particle analyte and single biological molecules with an accuracy that cannot be achieved using ensemble measurements. The research tasks are below: (1) The lubricated superhydrophobic surfaces with engineered micro/nanostructures can make the liquid droplet stand with a sufficiently large contact angle for WGM sensing and the lubricant cloaking can help prevent fast evaporation of water droplet; (2) The novel WGM system configuration enables resilient coupling of the liquid microcavity with the built-in waveguide on the substrate; (3) An ideal detection system requires not only the ability of trace analyte response or single-particle-level response, but also the rapid detection of targets. Electrowetting will be applied to actuate liquid droplets in a programmable path and transport to the target with built-in waveguide for WGM sensing; (4) For the first time, ultra-sensitivity WGM will be employed to detect the existence of depletion shell on a liquid droplet; (5) The overarching goal is to develop chip-scale integrated photonic sensing systems that combine optical, electrical, and fluidic functions. This proposed high Q-factor approach will pave the way for sensors that have unprecedented sensitivity to tiny changes in their environments.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

小型化、便携式、灵敏且低成本的传感系统对于医疗和环境诊断和监测应用非常重要。结合光学、电学和流体功能的芯片级集成光子传感系统对于传感应用特别有吸引力，因为光学传感器的高灵敏度、芯片级系统的小尺寸以及制造系统的低成本处理可能拥有成熟的大规模生产技术。虽然通过多种方法实现了检测限低至单个纳米颗粒的光学传感，例如散射干涉仪、光热显微镜和纳米纤维传感器，但微腔传感因其高质量因子（Q 因子，物理上代表能量的速率）而备受关注。相对于总存储能量的损失）和小模式体积可以显着增强光与物质的相互作用。微腔传感已经取得了巨大的进步，其传感性能已通过检测单个纳米粒子和单个生物分子得到了证明。然而，只有在极少数情况下，使用在封闭的封闭环境中浸没或充满液体的介电微谐振器才能实现回音壁模式（WGM，即由外腔界面处的全内反射支持的封闭圆形光束）腔体中的液体检测。环境。迄今为止，尚未报道过使用非固体光学谐振器进行真实且稳定的高品质因数传感实验。在该项目中，弗吉尼亚理工大学组建的团队旨在利用直接由液滴制成的微谐振器进行光学传感。该项目的新研究成果将与教育事业相结合。仿生纳米科学和机械工程将与 K-12 各级教育相结合。参与拟议的研究将激励代表性不足的群体获得高级学位。除研究生外，本科生和女学生也将通过论文、基于项目的课程或多学科高级设计项目参与研究。该项目的研究目标是协助实现具有超微结构的片上检测和尺寸系统。高灵敏度和 Q 因子，为研究单颗粒分析物和单个生物分子的特性和动力学奠定了基础，其精度是使用整体测量无法实现的。研究任务如下：（1）具有工程化微/纳米结构的润滑超疏水表面可以使液滴具有足够大的接触角以进行WGM传感，并且润滑剂隐身可以帮助防止水滴快速蒸发； (2)新颖的WGM系统配置实现了液体微腔与基板上内置波导的弹性耦合； (3)理想的检测系统不仅需要具有痕量分析物响应或单粒子水平响应的能力，而且还需要能够快速检测目标。电润湿将用于驱动可编程路径中的液滴，并通过内置波导将液滴传输到目标，以进行 WGM 传感； （4）首次采用超灵敏WGM检测液滴上耗尽层的存在； (5) 总体目标是开发结合光学、电学和流体功能的芯片级集成光子传感系统。这种提出的高 Q 因子方法将为传感器铺平道路，使其对环境中的微小变化具有前所未有的敏感性。该奖项反映了 NSF 的法定使命，并通过使用基金会的智力价值和更广泛的影响审查标准进行评估，被认为值得支持。

项目成果

Partial Leidenfrost Evaporation-Assisted Ultrasensitive Surface-Enhanced Raman Spectroscopy in a Janus Water Droplet on Hierarchical Plasmonic Micro-/Nanostructures

分级等离子体微/纳米结构上 Janus 水滴的部分莱顿弗罗斯特蒸发辅助超灵敏表面增强拉曼光谱

• DOI: 10.1021/acsnano.0c04239
• 发表时间: 2020-08
• 期刊: ACS Nano
• 影响因子: 17.1
• 作者: Song, Junyeob;Cheng, Weifeng;Nie, Meitong;He, Xukun;Nam, Wonil;Cheng, Jiangtao;Zhou, Wei
• 通讯作者: Zhou, Wei

Leidenfrost Evaporation-Assisted Ultrasensitive Surface-Enhanced Raman Spectroscopy

莱顿弗罗斯特蒸发辅助超灵敏表面增强拉曼光谱

• DOI: 10.1364/fio.2020.fth2d.3
• 发表时间: 2020-09
• 期刊: Frontiers in Optics/Laser Science Conference
• 作者: Song, Junyeob;Cheng, Weifeng;Nie, Meitong;He, Xukun;Nam, Wonil;Cheng, Jiangtao;Zhou, Wei
• 通讯作者: Zhou, Wei

Modeling liquid droplet impact on a micropillar-arrayed viscoelastic surface via mechanically averaged responses

通过机械平均响应模拟液滴对微柱阵列粘弹性表面的影响

• DOI: 10.1080/19942060.2023.2194949
• 发表时间: 2023-04-06
• 期刊: Engineering Applications of Computational Fluid Mechanics
• 影响因子: 6.1
• 作者: Yang Li;Jiangtao Cheng
• 通讯作者: Jiangtao Cheng

Evaporation of squeezed water droplets between two parallel hydrophobic/superhydrophobic surfaces

两个平行疏水/超疏水表面之间挤压水滴的蒸发

• DOI: 10.1016/j.jcis.2020.05.003
• 发表时间: 2020-09
• 期刊: Journal of Colloid and Interface Science
• 影响因子: 9.9
• 作者: He, Xukun;Cheng, Jiangtao;Patrick Collier, C.;Srijanto, Bernadeta R.;Briggs, Dayrl P.
• 通讯作者: Briggs, Dayrl P.

Coalescence-Induced Swift Jumping of Nanodroplets on Curved Surfaces

聚结诱导纳米液滴在曲面上的快速跳跃

• DOI: 10.1021/acs.langmuir.9b01300
• 发表时间: 2019-07
• 期刊: Langmuir
• 影响因子: 3.9
• 作者: He, Xukun;Zhao, Lei;Cheng, Jiangtao
• 通讯作者: Cheng, Jiangtao