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Micromachines, Volume 16, Issue 4
April 2025 - 133 articles
Cover Story: This study explores microscale acoustic energy harvesting using oscillating microbubbles as resonators for implantable biomedical devices. Traditional piezoelectric acoustic harvesters are limited by their low energy output and impractical sizes for microscale use. In a comparison of a freestanding piezoelectric diaphragm with one coupled to an acoustically oscillated microbubble, the latter demonstrated a sevenfold increase in harvested energy. These results were validated through laser Doppler vibrometer (LDV) measurements and stress analysis. Additional testing in a phantom tissue tank confirmed the system's biomedical viability. The findings suggest that acoustically resonating microbubbles are a promising solution for enhancing energy output in compact, implantable piezoelectric devices. View this paper
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Micromachines - ISSN 2072-666X