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

Lee, Hyeonwoo; Partanen, Mikko; Lee, Mingyu; Jeong, Sunghoon; Lee, Hyeung Joo; Kim, Kwanpyo; Ryu, WonHyoung; Dholakia, Kishan; Oh, Kyunghwan

doi:10.1039/d1nr06211e

Cited by 4 publications

(4 citation statements)

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“…2010; Mei & Brydegaard 2015) or in optical atomisation techniques that can be applied to the production of airborne transported microdrops used as drug carriers (Lee et al. 2022). At the heart of all of these research fields is the injection of high-power photons into a small liquid sample, the initiation of phase transition from liquid to vapour, the rapid pressure fluctuations and the successive complex fluid mechanics driven by this impulsive energy input.…”

Section: Introductionmentioning

confidence: 99%

“…Phase explosion in confined liquid volumes has recently gained interest because of its connection with thriving research areas like x-ray liquid crystallography (Grünbein et al 2021), x-ray holography (Hagemann et al 2021;Vassholz et al 2021), extreme UV light and plasma generation (Favre et al 2002). A better understanding of the interaction of high-power lasers with small liquid particles is also relevant in laser-based atmospheric monitoring techniques (Rohwetter et al 2010;Mei & Brydegaard 2015) or in optical atomisation techniques that can be applied to the production of airborne transported microdrops used as drug carriers (Lee et al 2022). At the heart of all of these research fields is the injection of high-power photons into a small liquid sample, the initiation of phase transition from liquid to vapour, the rapid pressure fluctuations and the successive complex fluid mechanics driven by this impulsive energy input.…”

Section: Introductionmentioning

confidence: 99%

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Bubble nucleation and jetting inside a millimetric droplet

et al. 2023

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In this work we present experiments and simulations on the nucleation and successive dynamics of laser-induced bubbles inside liquid droplets in free-fall motion, i.e. a case where the bubbles are subjected to the influence of a free boundary in all directions. Within this spherical millimetric droplet, we have investigated the nucleation of secondary bubbles induced by the rarefaction wave that is produced when the shock wave emitted by the laser-induced plasma reflects at the drop surface. Interestingly, three-dimensional clusters of cavitation bubbles are observed. Their shape is compared with the negative pressure distribution computed with a computational fluid dynamics model and allows us to estimate a cavitation threshold value. In particular, we observed that the focusing of the waves in the vicinity of the free surface can give rise to explosive cavitation events that end up in fast liquid ejections. High-speed recordings of the drop/bubble dynamics are complemented by the velocity and pressure fields simulated for the same initial conditions. The effect of the proximity of a curved free surface on the jetting dynamics of the bubbles was qualitatively assessed by classifying the cavitation events using a non-dimensional stand-off parameter ${\Upsilon\hskip -1,05em -\,}$ that depends on the drop size, the bubble maximum radius and the relative position of the bubble inside the drop. Additionally, we studied the role of the drop's curvature by implementing a structural similarity algorithm to compare cases with bubbles produced near a flat surface to the bubbles inside the drop. Interestingly, this quantitative comparison method indicated the existence of equivalent stand-off distances at which bubbles influenced by different boundaries behave in a very similar way. The oscillation of the laser-induced bubbles promotes the onset of Rayleigh–Taylor and Rayleigh–Plateau instabilities, observed on the drop's surface. This phenomenon was studied by varying the ratio of the maximum radii of the bubble and the drop. The specific mechanisms leading to the destabilisation of the droplet surface were identified.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Bubble nucleation and jetting inside a millimetric droplet

et al. 2023

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“…Previous research has indicated that optical atomizers employing single-walled carbon nanotubes (SWCNTs) reliably operated with laser powers below 20mW. 4 In contrast, our optical atomizer with a metal film demonstrated remarkable thermal stability, implying its ability to withstand higher laser powers, thus enabling ejection at elevated laser power levels. This improved device stability enhances its suitability for high-power applications, making it particularly well-suited for demanding scenarios that necessitate higher laser powers.…”

Section: Resultsmentioning

confidence: 89%

Novel liquid atomization technique based on photothermal generation of the metallic thin film

Kim,

Lee,

2024

Laser-Based Micro- And Nanoprocessing XVIII

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This study introduces an innovative liquid atomization method that utilizes an optical approach. The technique involves the precise deposition of a metal film at the end of a hollow optical fiber, using the photothermal effect to achieve highly efficient liquid atomization. In contrast to previous studies on optical atomizers, our research demonstrates substantial advancements, particularly in precision control and the extension of ejection distances. Furthermore, this study explores the potential applications of this technology in scenarios involving high-laser power. While atomization techniques are commonly observed in everyday life through spray mechanisms, our research significantly enhances precision control, making it particularly relevant to the biomedical field. In summary, our study contributes significantly to the evolution of atomization techniques, holding great promise for practical utilization in the future, especially in fields such as nanoprinting and biomedical applications. Our innovative approach opens up new possibilities for precise liquid atomization, expanding the horizons of applications across various domains.

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“…In today's scarcity of freshwater resources, SIE technology is becoming attractive extremely. [21][22][23][24] In the last decade, along with the rapid boom of new nanomaterials such as graphene oxide (GO), [25][26][27][28] reduced graphene oxide (rGO), [29][30][31][32][33] carbon nanotube (CNT), [34][35][36] and various efficient photothermal structure designs, the efficiency of SIE can still reach 90% even at low solar concentration. New photothermal nanomaterials can achieve excellent broad-spectrum absorption and can convert solar energy into heat efficiently, making a qualitative leap in the traditional thermal distillation process and becoming a green and environmentally clean water production technology.…”

Section: Introductionmentioning

confidence: 99%

Solar Interfacial Evaporation at the Water–Energy Nexus: Bottlenecks, Approaches, and Opportunities

et al. 2023

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Solar interfacial evaporation (SIE) technology has become an important research content in the water treatment fields gradually. It is low cost and sustainable, especially when water resources are scarce and energy infrastructure is not perfect and can deliver high‐quality freshwater. In recent years, along with the rise of new nanomaterials, water evaporation efficiency improved further; additionally, the efficient evaporation system structure design and thermal managements can improve the absorbance and latent heat recovery efficiently. These advanced researches make SIE efficiency is enhanced markedly, especially in small water evaporation equipment driven by solar energy wholly. It can achieve extremely high steam generation rate and possess an extensive application prospect. In this critical review, the photothermal mechanisms and material types of new photothermal materials, the basic structural design requirements of SIE systems primarily are discussed. On this basis, the applications of SIE techniques in the water–energy relations from the microscopic scale to the molecular level in the past decade are summarized. Finally, bottlenecks of the development of SIE technology, as well as the approaches and opportunities in the future, are discussed critically, new ideas are provided for the long‐range objective of utilizing renewable energy to generate clean water for environmentally sustainable development.

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

Abstract: This paper presents a novel atomizing methodology along the single strand of an optical fiber integrated with single-walled carbon nanotubes. Based on this photonic device, numerous droplets generation with zeptoliter volume scale was confirmed.

Cited by 4 publications

References 81 publications

Bubble nucleation and jetting inside a millimetric droplet

Bubble nucleation and jetting inside a millimetric droplet

Novel liquid atomization technique based on photothermal generation of the metallic thin film

Solar Interfacial Evaporation at the Water–Energy Nexus: Bottlenecks, Approaches, and Opportunities

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