Feng Yiwen, Jia Deli, Yue Honger, Wang Jie, Song Wenping, Li Longqiu, Zhang A-Man, Li Shuai, Chang Xiaocong, Zhou Dekai
Key Laboratory of Microsystems and Microstructures Manufacturing (Harbin Institute of Technology), Ministry of Education, Harbin, 150001, China.
Research Institute of Petroleum Exploration & Development, PetroChina Company Limited, Beijing, 100083, China.
Small. 2023 May;19(18):e2207565. doi: 10.1002/smll.202207565. Epub 2023 Feb 2.
Micromotors hold great promise for extensive practical applications such as those in biomedical domains and reservoir exploration. However, insufficient propulsion of the micromotor limits its application in crossing biological barriers and breaking reservoir boundaries. In this study, an ultrafast microbullet based on laser cavitation that can utilize the energy of a cavitation bubble and realize its own hurtling motion is reported. The experiments are performed using high-speed photography. A boundary integral method is adopted to reveal the motion mechanism of a polystyrene (PS)/magnetic nanoparticle (MNP) microbullet under the action of laser cavitation. Furthermore, the influence of certain factors (including laser intensity, microbullet size, and ambient temperature) on the motion of the microbullet was explored. For the PS/MNP microbullet driven by laser cavitation, the instantaneous velocity obtained can reach 5.23 m s . This strategy of driving the PS/MNP microbullet provides strong penetration ability and targeted motion. It is believed that the reported propulsion mechanism opens up new possibilities for micromotors in a wide range of engineering applications.
微电机在生物医学领域和油藏勘探等广泛的实际应用中具有巨大潜力。然而，微电机推进力不足限制了其在穿越生物屏障和突破油藏边界方面的应用。在本研究中，报道了一种基于激光空化的超快微子弹，它可以利用空化泡的能量实现自身的高速运动。实验采用高速摄影进行。采用边界积分方法揭示了聚苯乙烯（PS）/磁性纳米颗粒（MNP）微子弹在激光空化作用下的运动机制。此外，还探讨了某些因素（包括激光强度、微子弹尺寸和环境温度）对微子弹运动的影响。对于由激光空化驱动的PS/MNP微子弹，获得的瞬时速度可达5.23 m/s。这种驱动PS/MNP微子弹的策略具有很强的穿透能力和定向运动能力。据信，所报道的推进机制为微电机在广泛的工程应用中开辟了新的可能性。
