High Surface Area Reverse Electrowetting Mechanoelectrical Transduction

高表面积反向电润湿机电转换

• 批准号: 2246559
• 负责人: Ifana Mahbub
• 金额: $ 36.8万
• 依托单位: University of Texas at Dallas
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2022
• 资助国家: 美国
• 起止时间: 2022-10-01 至 2024-09-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2246559&HistoricalAwards=false
• 关键词: Surface; Area; Reverse; Electrowetting; Mechanoelectrical

Self-powered sensors capable of zero-maintenance monitoring and data collection over days to weeks are currently not available for many applications that do not have regular access to solar energy or wireless power transmission. The goal of this research project is to use the high surface area advantage of a liquid-based energy harvesting concept called reverse electrowetting to harvest energy from low-frequency movement and to develop a self-powered motion sensor to detect various movements such as walking and running. A miniaturized integrated circuit (IC) chip will also be developed that will make the energy harvester highly suitable for other industrial and biomedical applications. This technology will make it possible to develop self-powered devices capable of long-term motion sensing that can be useful for monitoring post-operative elderly patients who are recovering from procedures such as joint replacement surgery. The self-powered motion sensor will rely on the harvested kinetic motion as its external energy source and will be capable of long-term operation. Such a wireless sensor has not previously been demonstrated for low-frequency kinetic energy harvesting. Also, as a part of this project, energy harvesting, and circuit design experiences will be added to the University of North Texas (UNT) College of Engineering summer camp for the K-12 youth as well as providing sponsorship for an undergraduate senior design team.High surface area reverse electrowetting depends on reversible electrolyte movement within a porous electrode with applied pressure or an electric field. Key limiting parameters that have not been previously verified experimentally include electrode pore size, electrolyte conductivity, dielectric type or thickness, surface finish, and the pressure and voltage magnitude or frequency. These parameters will be modeled, optimized, and experimentally validated to achieve the maximum available energy or power for a cm-sized transducer. The hypothesis is: reverse electrowetting is capable of producing 1 mW/cm2 at 10 Hz oscillation frequency through the use of high surface area materials and parameter optimization. These design parameters will be used in the selection and integration of highly porous electrode materials (e.g. sintered metal and buckypaper) with electrolyte, electret, and housing components for maximum low-frequency energy harvesting in a ~5 cm3 package. An integrated circuit (IC) will be developed to convert the harvested energy into a usable constant DC power supply. The system will be integrated with a low-power wireless data transmission circuitry and miniaturized antenna on a flexible PDMS substrate for developing a self-powered, conformable motion sensor. This wearable sensor will be unique as it will be self-powered and low-cost and will demonstrate high surface area reverse electrowetting's ability to harvest enough energy from low-frequency motion to entirely self-power a wearable motion sensor. Specific contributions from this research include: fundamental understanding of high surface area reverse electrowetting, demonstration of reverse electrowetting in a flexible system, highly efficient rectifier and DC-DC converter topologies that can start with as low as 30 mV input voltages, and an integrated self-powered motion sensor with wireless data transmission capability.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.

能够在几天到几周内进行零维护监控和数据收集的自供电传感器目前不适用于许多无法定期访问太阳能或无线电力传输的应用。该研究项目的目标是利用称为反向电润湿的液体能量收集概念的高表面积优势，从低频运动中收集能量，并开发自供电运动传感器来检测各种运动，例如步行和运动。跑步。还将开发一种小型化集成电路（IC）芯片，使能量采集器非常适合其他工业和生物医学应用。这项技术将使开发能够长期运动感应的自供电设备成为可能，这些设备可用于监测从关节置换手术等手术中恢复的术后老年患者。自供电运动传感器将依靠收集的动能作为其外部能源，并且能够长期运行。这种无线传感器之前尚未被证明可用于低频动能收集。此外，作为该项目的一部分，北德克萨斯大学 (UNT) 工程学院 K-12 青少年夏令营将增加能量收集和电路设计经验，并为本科生高级设计团队提供赞助高表面积反向电润湿取决于施加压力或电场时多孔电极内电解质的可逆运动。之前未经实验验证的关键限制参数包括电极孔径、电解质电导率、电介质类型或厚度、表面光洁度以及压力和电压幅度或频率。这些参数将被建模、优化和实验验证，以实现厘米尺寸传感器的最大可用能量或功率。假设是：通过使用高表面积材料和参数优化，反向电润湿能够在 10 Hz 振荡频率下产生 1 mW/cm2。这些设计参数将用于选择和集成高度多孔的电极材料（例如烧结金属和巴基纸）与电解质、驻极体和外壳组件，以在约 5 cm3 封装中实现最大低频能量收集。将开发一种集成电路（IC），将收集到的能量转换成可用的恒定直流电源。该系统将在柔性 PDMS 基板上与低功耗无线数据传输电路和小型化天线集成，以开发自供电、舒适的运动传感器。这种可穿戴传感器将是独一无二的，因为它将是自供电和低成本的，并将展示高表面积反向电润湿从低频运动中收集足够能量以完全自供电可穿戴运动传感器的能力。这项研究的具体贡献包括：对高表面积反向电润湿的基本理解、灵活系统中反向电润湿的演示、可以从低至 30 mV 输入电压启动的高效整流器和 DC-DC 转换器拓扑，以及集成的自具有无线数据传输能力的动力运动传感器。该奖项反映了 NSF 的法定使命，并通过使用基金会的智力优点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

Design and SAR Analysis of a Meander Slot Antenna for Backscattering RFID Applications

用于反向散射 RFID 应用的曲折槽天线的设计和 SAR 分析

• DOI: 10.23919/usnc-ursinrsm57470.2023.10043113
• 发表时间: 2023-01
• 期刊: 2023 United States National Committee of URSI National Radio Science Meeting (USNC-URSI NRSM
• 作者: Kakaraparty, Karthik;Mahbub, Ifana
• 通讯作者: Mahbub, Ifana

Advancement of Reverse Electrowetting-on-Dielectric With Flexible Electrodes for Bias-Free Energy- Harvesting Applications

用于无偏压能量收集应用的柔性电极反向电润湿电介质的进展

• DOI: 10.1109/jsen.2023.3264103
• 发表时间: 2023-05-15
• 期刊: IEEE Sensors Journal
• 影响因子: 4.3
• 作者: Karthik Kakaraparty;Erik A. Pineda;R. Reid;I. Mahbub
• 通讯作者: I. Mahbub

Theoretical Modeling and Experimental Validation of Reverse Electrowetting on Dielectric (REWOD) Through Flexible Electrodes For Self-Powered Sensor Applications

用于自供电传感器应用的通过柔性电极进行电介质反向电润湿 (REWOD) 的理论建模和实验验证

• DOI: 10.1109/sensors52175.2022.9967270
• 发表时间: 2022-10
• 期刊: 2022 IEEE Sensors
• 作者: Kakaraparty, Karthik;Hyer, Gretchen S.;Pineda, Erik A.;Reid, Russell C.;Mahbub, Ifana
• 通讯作者: Mahbub, Ifana