Micro‐Droplets Parameters Monitoring in a Microfluidic Chip via Liquid‐Solid Triboelectric Nanogenerator

Author:

Liu Wenkai12,Li Hengyu23,Gao Qi24,Zhao Da2,Yu Yang24,Xiang Qin12,Cheng Xiaojun24,Wang Zhong Lin25,Long Wei1,Cheng Tinghai24ORCID

Affiliation:

1. Faculty of Mechanical and Electrical Engineering Kunming University of Science and Technology Kunming 650500 China

2. Beijing Institute of Nanoenergy and Nanosystems Chinese Academy of Sciences Beijing 101400 China

3. College of Materials Science and Opto‐Electronic Technology University of Chinese Academy of Sciences Beijing 100049 China

4. School of Nanoscience and Engineering University of Chinese Academy of Sciences Beijing 100049 China

5. Georgia Institute of Technology Atlanta GA 30332‐0245 USA

Abstract

AbstractThe monitoring of micro‐droplets parameters is significant to the development of droplet microfluidics. However, existing monitoring methods have drawbacks such as high cost, interference with droplet movement, and even the potential for cross‐contamination. Herein, a micro‐droplets monitoring method (MDMM) based on liquid‐solid triboelectric nanogenerator (LS‐TENG) is proposed, which can realize non‐invasive and self‐powered monitoring of micro‐droplets in a microfluidic chip. The droplet frequency is monitored by voltage pulse frequency and a mathematical model is established to monitor the droplet length and velocity. Furthermore, this work constructs micro‐droplets sensor (MDS) based on the MDMM to carry out the experiment. The coefficients of determination (R2) of the fitting curves of the micro‐droplets frequency, length, and velocity monitoring are 0.998, 0.997, and 0.995, respectively. To prove the universal applicability of the MDMM, the micro‐droplets generated by different liquid media and channel structures are monitored. Eventually, a micro‐droplet monitoring system is built, which can realize the counting of micro‐droplets and the monitoring of droplet frequency and length. This work provides a novel approach for monitoring micro‐droplets parameters, which holds the potential to advance developments in the field of microfluidics.

Funder

Natural Science Foundation of Beijing Municipality

Publisher

Wiley

Subject

Mechanical Engineering,Mechanics of Materials,General Materials Science

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