期刊
ANALYTICAL CHEMISTRY
卷 93, 期 48, 页码 16008-16016出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.analchem.1c03512
关键词
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资金
- National Natural Science Foundation of China [51925601]
- Graduate Scientific Research and Innovation Foundation of Chongqing, China [CYB19060]
- Innovative Research Group Project of the National Natural Science Foundation of China [52021004]
Light-enabled droplet levitation has great potential in biotechnology, clinical medicine, and nanomaterial applications, with the ability to flexibly follow the motion of a moving laser beam. However, research shows that there is an upper limit to the motion of light-levitated droplets with a moving laser beam, which is caused by an inefficient interface temperature response and a small upward vertical vapor flow component. Above this upper limit, the droplets are unable to stably move with the laser beam and eventually disappear.
The light-enabled droplet levitation shows promising potential in applications in biotechnology, clinical medicine, and nanomaterials. In particular, light-levitated droplets have good followability with a moving laser beam, resulting in flexibility in manipulating their motion. However, it is still unclear whether there exists an upper limit to the light-levitated droplet motion with a moving laser beam. Therefore, the motion of light-levitated droplets above the free interface is studied to determine the upper limit of motions of the droplets with a moving laser beam. We demonstrate that an inefficient interface temperature response because of a very high moving speed of the laser beam and the resultant small upward vertical component of vapor flow are responsible for the existence of an upper-limit velocity. Above the upper limit, the light-levitated droplets are unable to stably move with the laser beam and finally disappear. By contrast, the droplets can stably move with the laser beam in a wide range at or below this upper limit. In addition, an almost linear relationship between the upper-limit velocity of the light-levitated droplets and the input laser power is presented. The findings of the present study are informative for the implementation of this light levitation technology.
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