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A laser-driven optical atomizer: photothermal generation and transport of zeptoliter-droplets along a carbon nanotube deposited hollow optical fiber

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Title
A laser-driven optical atomizer: photothermal generation and transport of zeptoliter-droplets along a carbon nanotube deposited hollow optical fiber
Author(s)
Hyeonwoo Lee; Mikko Partanen; Mingyu Lee; Sunghoon Jeong; Hyeung Joo Lee; Kwanpyo Kim; Wonhyoung Ryu; Kishan Dholakia; Kyunghwan Oh
Publication Date
2022-03
Journal
Nanoscale, v.14, no.13, pp.5138 - 5146
Publisher
Royal Society of Chemistry
Abstract
© 2022 The Royal Society of ChemistryFrom mechanical syringes to electric field-assisted injection devices, precise control of liquid droplet generation has been sought after, and the present state-of-the-art technologies have provided droplets ranging from nanoliter to subpicoliter volume sizes. In this study, we present a new laser-driven method to generate liquid droplets with a zeptoliter volume, breaking the fundamental limits of previous studies. We guided an infrared laser beam through a hollow optical fiber (HOF) with a ring core whose end facet was coated with single-walled carbon nanotubes. The laser light was absorbed by this nanotube film and efficiently generated a highly localized microring heat source. This evaporated the liquid inside the HOF, which rapidly recondensed into zeptoliter droplets in the surrounding air at room temperature. We spectroscopically confirmed the chemical structures of the liquid precursor maintained in the droplets by atomizing dye-dissolved glycerol. Moreover, we explain the fundamental physical principles as well as functionalities of the optical atomizer and perform a detailed characterization of the droplets. Our approach has strong prospects for nanoscale delivery of biochemical substances in minuscule zeptoliter volumes.
URI
https://pr.ibs.re.kr/handle/8788114/11453
DOI
10.1039/d1nr06211e
ISSN
2040-3364
Appears in Collections:
Center for Nanomedicine (나노의학 연구단) > 1. Journal Papers (저널논문)
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