Light‐Ultrasound Driven Collective "Firework" Behavior of Nanomotors. Issue 7 (2nd May 2018)

• Record Type: Journal Article
• Authors: Zhou, Dekai; Gao, Yuan; Yang, Junjie; Li, Yuguang C.; Shao, Guangbin; Zhang, Guangyu; Li, Tianlong; Li, Longqiu
• Is Part Of: Advanced science. Volume 5:Issue 7(2018)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2018-05-02
• Subjects: aggregation -- collective behavior -- diffusion -- firework behavior -- nanomotors; Science -- Periodicals; 505
• DOI: 10.1002/advs.201800122
• Languages: English
• ISSNs: 2198-3844

Abstract

Abstract: It is of great interest and big challenge to control the collective behaviors of nanomotors to mimic the aggregation/separation behavior of biological systems. Here, a light‐acoustic combined method is proposed to control the aggregation/separation of artificial nanomotors. It is shown that nanomotors aggregate at the pressure node in acoustic field and afterward present a collective "firework" separation behavior induced by light irradiation. The collective behavior is found to be applicable for metallic materials and polymers even different light wavelengths are used. Physical insights on the collective firework behavior resulting from the change of acoustic streaming caused by optical force are provided. It is found that diffusion velocity and diffusion region of cluster can be controlled by adjusting light intensity and acoustic excitation voltage, and irradiation direction, respectively. This harmless, controllable, and widely applicable method provides new possibilities for groups of nanomachines, drug release, and cargo transport in nanomedicine and nanosensors. Abstract : Collective "firework" separation behavior of artificial nanomotors in light‐ultrasound combined field is investigated experimentally and theoretically. Acoustic streaming caused by the optical force results in this unique firework phenomenon. Light intensity, acoustic excitation voltage, and irradiation direction can be utilized to control the diffusion velocity and diffusion region of cluster.