Jeong, S.-Y.; Seo, H.-B.; Seo, M.-H.; Cho, J.-W.; Kwon, S.; Son, G.; Lee, S.-Y. Repeatable Acoustic Vaporization of Coated Perfluorocarbon Bubbles for Micro-Actuation Inspired by Polypodium aureum. Biomimetics2024, 9, 106.
Jeong, S.-Y.; Seo, H.-B.; Seo, M.-H.; Cho, J.-W.; Kwon, S.; Son, G.; Lee, S.-Y. Repeatable Acoustic Vaporization of Coated Perfluorocarbon Bubbles for Micro-Actuation Inspired by Polypodium aureum. Biomimetics 2024, 9, 106.
Jeong, S.-Y.; Seo, H.-B.; Seo, M.-H.; Cho, J.-W.; Kwon, S.; Son, G.; Lee, S.-Y. Repeatable Acoustic Vaporization of Coated Perfluorocarbon Bubbles for Micro-Actuation Inspired by Polypodium aureum. Biomimetics2024, 9, 106.
Jeong, S.-Y.; Seo, H.-B.; Seo, M.-H.; Cho, J.-W.; Kwon, S.; Son, G.; Lee, S.-Y. Repeatable Acoustic Vaporization of Coated Perfluorocarbon Bubbles for Micro-Actuation Inspired by Polypodium aureum. Biomimetics 2024, 9, 106.
Abstract
A fern, Polypodium aureum, possesses a specialized spore-releasing mechanism like a catapult induced by quick expansion of vaporized bubbles. This study introduces lipid-coated perfluorocarbon droplets to enable repeatable vaporization-condensation cycles, inspired by the repeatable vaporization of Polypodium aureum. Lipid-perfluorocarbon droplets have been considered not to exhibit repeatable oscillations due to bubble collapse by low surface tension of lipid layers. However, a single lipid-dodecafluoropentane droplet with a diameter of 9.17 µm shows expansion-contraction oscillations over 4,000 cycles by changing lipid composition and applying low power of 1.7 MHz ultrasound to induce partial vaporization of droplets. The optimal combinations of shell composition, droplet fabrication, and acoustic conditions can minimize damage on shell structure and quick recovery of damaged shell layers. The highly-expanding oscillatory microbubbles provide a new direction for fuel-free micro or nanobots as well as biomedical applications of contrast agents and drug delivery.
Copyright:
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