Liquid–Solid Triboelectric Probes for Bubbles Status Monitoring

Abstract

Bubble status monitoring is essential for designing material nanostructures and optimizing industrial processes. However, tracking the fluid dynamics of bubbles is challenging due to their random distribution and irregular dynamic changes. In this study, a tube liquid–solid triboelectric nanogenerator serves as a probe to investigate bubbles at the liquid–solid interface. The study explores the impact of bubble fluid dynamics on liquid–solid contact electrification, examining variables such as flow rates, volumes, and release intervals of bubbles. The study demonstrates that the liquid–solid triboelectric probe can work as a non‐intrusive and self‐powered sensor for monitoring bubble states in chemical fluid control. The sensor exhibits a sensitivity of 13.2 V·cm−3, a signal‐bubble volume correlation coefficient of 0.9964, and a rapid response time of 0.15 s. The sensor, integrated with a wireless module, enables continuous remote detection. This work provides a valuable tool for investigating tri‐phase contact electrification dynamics and presents promising technology for bubble state monitoring.

Directional Moisture-Wicking Triboelectric Materials Enabled by Laplace Pressure Differences

“…The self-powered respiratory sensor realizes wireless monitoring of respiratory status, which is crucial for the construction of smart medical treatment. − The directional moisture-wicking sensor provides two monitoring modes, one is a wired connection with the intelligent control terminal, and the other is a connection with the wireless mobile terminal. − In the wired mode, the sensor can easily distinguish between different states of respiration, such as depth and rate (Figure f). Furthermore, specific to sports, running and walking can be distinguished efficiently (Figure S9).…”