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Monolithic Integration of Acoustic Enrichment and Resonant Sensing for Trace Detection of Micro-Plastics
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Researchers developed a monolithic chip integrating acoustic enrichment and resonant mass sensing via a 3x3 piezoelectric micromachined resonator array, demonstrating particle focusing within 30 seconds and a significantly larger frequency shift for microplastic detection in seawater compared to random particle dispersion.
We present a novel technique that integrates acoustic enrichment and liquid-phase mass sensing on a single chip fabricated with a 3×3 piezoelectric micromachined resonator array (PMRA). A SiN barrier layer completely covers the surface of the PMRA, providing insulation and dustproof protection. The PMRA, connected in parallel, is driven solely by a single RF signal of 20 V for acoustic particles focusing within 30 seconds. The frequency shift after particles were loaded at the central area (1.75 kHz) is significantly larger than the random dispersion (1.05 kHz). This technique shows potential for point-of-care detection and identification of microplastics in seawater.
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An acoustofluidic device using piezoelectric resonance was developed to concentrate sparse particles including microplastics onto a sensor surface for nanogram-scale mass measurements, offering a compact platform for rapid in-field analysis of microplastic concentrations in environmental water samples.
A Fully Integrated Microplastic Detection SoC with 0.1–3 GHz Bandwidth and 35 dB Dynamic Range for Narrow-Band Notch RF MEMS Sensor System
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Engineers developed a miniaturized microwave sensor chip that can detect microplastics in water by measuring shifts in resonant frequency as particles pass through a microfluidic channel, achieving a wide bandwidth and high dynamic range in a compact integrated circuit design. This type of on-chip detection system could enable portable, real-time water quality monitoring for microplastic contamination at a fraction of the cost of laboratory methods.
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Researchers designed a multi-channel MEMS sensor that can simultaneously measure the concentration of microplastics and sort them by size using microwave resonance technology. This miniaturized detection approach addresses a key technical challenge in microplastic monitoring — the need for rapid, size-resolved quantification at low concentrations in water.
RF MEMS Resonance Sensor for Measuring Microplastics Concentration
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Researchers designed an RF MEMS resonance sensor capable of detecting microplastics in water at low cost, offering a practical alternative to expensive conventional particle analyzers for environmental monitoring.
Demonstration of serial separations by acoustic focusing for the recovery of microplastics at high concentration
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Researchers designed a microfluidic acoustic focusing device that concentrates microplastic particles using sound waves and serial trifurcated channel branches, achieving over 100-fold concentration of microplastic suspensions. The technology has potential applications for collecting and analysing microplastics in water samples.
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