Piezoelectric Molecular Selection Pump Based on Stokes’ Principle

The selective screening of mixed gas molecular particles facilitates the research of sample viral molecular particles in biomedicine. However, current gas particle screening techniques face a series of challenges, including controllable selective filtration, operational complexity, pressure drop due to filtration resistance, limitations in filter media and materials, and the construction of carrier platforms. This study investigates a piezoelectric molecular selection pump that integrates piezoelectric vibrator actuation with device design and microchannel structure optimization. By adjusting the characteristics of the input current, the vibration state of the piezoelectric actuator (0–2.5 × 10–5 rad) can be precisely controlled to manipulate the flow pattern and velocity (0–0.35 m/s) of the mixed gas. Based on Stokes’ principle, the device achieves selective deposition of molecular particles of different radii through curved flow paths as the applied voltage changes, resulting in a controllable and selective separation of target microparticles (≤1 μm) with a concentration efficiency exceeding 98%. The maximum flow rate of the unoptimized piezoelectric pump is 800 mL/min. The structural design of the piezoelectric molecular pump is optimized as lightweight, portable, and user-friendly. The device demonstrates high sensitivity, rapid screening speeds (4 mL/s), high operational efficiency, safety (I < 4 × 10–3 A), low power consumption (P ≤ 0.5 W), and low noise levels (D≤20 dB). Furthermore, after 12 months of continuous operation, efficiency loss is controlled to within 0.8%, indicating exceptional durability and self-cleaning functionality, allowing for long-term repeated use without compromising performance. This advanced device holds significant potential for applications in virus gas detection, multitarget mixed gas screening, biomedicine, microdosing drug transport, controlled microfluidic delivery, and harmful gas detection across diverse fields.