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  1. Article ; Online: Vapor distribution changes evaporative flux profiles of a sessile droplet.

    Kuk, Minhyeok / Pyeon, Jeongsu / Kim, Hyoungsoo

    Journal of colloid and interface science

    2023  Volume 652, Issue Pt A, Page(s) 646–652

    Abstract: Hypothesis: We propose that during the evaporation of sessile droplets, the evaporative flux profile is primarily influenced by droplet geometry and composition under diffusion-limited conditions. Most studies have focused solely on the evaporation ... ...

    Abstract Hypothesis: We propose that during the evaporation of sessile droplets, the evaporative flux profile is primarily influenced by droplet geometry and composition under diffusion-limited conditions. Most studies have focused solely on the evaporation feature from the liquid to the gas phase, neglecting the extent to which the evaporated vapors affect the evaporation process. We hypothesize that if the molecular weight of the evaporated vapors is significantly high or low compared to the ambient gas, it could alter the evaporative flux.
    Experiments: We employed a direct optical measurement technique, specifically Mach-Zehnder interferometry. This demonstrated that the distribution of evaporated vapor molecules can substantially modify the evaporative flux profile.
    Findings: Our study discovered that substantial density gradients between vapor and air could either suppress or enhance the evaporative flux, depending on the droplet's orientation. This research offers fresh insights into evaporative fluxes by taking into account the relative vapor concentration and gravitational effects.
    Language English
    Publishing date 2023-08-11
    Publishing country United States
    Document type Journal Article
    ZDB-ID 241597-5
    ISSN 1095-7103 ; 0021-9797
    ISSN (online) 1095-7103
    ISSN 0021-9797
    DOI 10.1016/j.jcis.2023.07.209
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article ; Online: Liquid Metal Micro- and Nanodroplets: Characteristics, Fabrication Techniques, and Applications.

    Ryu, Gaabhin / Park, Inkyu / Kim, Hyoungsoo

    ACS omega

    2023  Volume 8, Issue 18, Page(s) 15819–15830

    Abstract: Gallium-based liquid metal micro- and nanodroplets are being extensively explored in innumerable emerging technologies. Although many of these systems involve the interfaces of liquid metal with a continuous phase liquid ( ...

    Abstract Gallium-based liquid metal micro- and nanodroplets are being extensively explored in innumerable emerging technologies. Although many of these systems involve the interfaces of liquid metal with a continuous phase liquid (
    Language English
    Publishing date 2023-04-24
    Publishing country United States
    Document type Journal Article ; Review
    ISSN 2470-1343
    ISSN (online) 2470-1343
    DOI 10.1021/acsomega.3c01382
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  3. Article ; Online: Crystal capillary origami capsule with self-assembled nanostructures.

    Park, Kwangseok / Kim, Hyoungsoo

    Nanoscale

    2021  Volume 13, Issue 35, Page(s) 14656–14665

    Abstract: The self-assembling mechanism of elasto-capillaries opens new applications in micro and nanotechnology by providing 3D assembly structures with 2D planar unit cells, so-called capillary origami. To date, the final structure has been designed based on the ...

    Abstract The self-assembling mechanism of elasto-capillaries opens new applications in micro and nanotechnology by providing 3D assembly structures with 2D planar unit cells, so-called capillary origami. To date, the final structure has been designed based on the predetermined shape and size of the unit cell. Here, we show that plate-like salt crystallites grow and cover the emulsion interface, which is driven by Laplace pressure. Eventually, it creates a spherical capsule with self-assembled nanostructures. The capsule and the crystallite are investigated by scanning electron microscopy and X-ray diffraction analysis. To explain the mechanism, we develop a theoretical model to estimate the capsule size, the shell thickness, and the conditions necessary to form the shell based on a thin-walled pressure vessel. The proposed crystal capillary origami can fabricate a three-dimensional self-assembled salt capsule without any complicated procedures. We believe that it can offer a new physicochemical avenue for the spontaneous and facile fabrication of water-soluble carrier particles.
    Language English
    Publishing date 2021-09-17
    Publishing country England
    Document type Journal Article
    ZDB-ID 2515664-0
    ISSN 2040-3372 ; 2040-3364
    ISSN (online) 2040-3372
    ISSN 2040-3364
    DOI 10.1039/d1nr02456f
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  4. Article ; Online: Vapor Absorption and Marangoni Flows in Evaporating Drops.

    Ryu, Junil / Ko, Han Seo / Kim, Hyoungsoo

    Langmuir : the ACS journal of surfaces and colloids

    2022  Volume 38, Issue 7, Page(s) 2185–2191

    Abstract: We experimentally and analytically studied vapor-driven solutal Marangoni flow by varying volatile liquid sources on top of the water droplet. We checked and compared the effects of solubility and vapor pressures of volatile liquids on the internal flow ... ...

    Abstract We experimentally and analytically studied vapor-driven solutal Marangoni flow by varying volatile liquid sources on top of the water droplet. We checked and compared the effects of solubility and vapor pressures of volatile liquids on the internal flow pattern using particle image velocimetry (PIV) and the droplet shape using shadowgraphy experiments. To explain the internal flow, we explored the absorption and evaporation mechanism of the vapors and we found that Henry's constant of the volatile liquid is the primary factor. Based on the scaling arguments, we developed theoretical models to explain how much vapor is absorbed into the water droplet, and how the flow pattern occurs and evolves. The scaling models show that there is a good agreement with the experimental results. We believe that understanding this phenomenon is useful for microfluidics applications and fundamental liquid-gas interface problems where vapors can be absorbed into another liquid.
    Language English
    Publishing date 2022-02-11
    Publishing country United States
    Document type Journal Article
    ZDB-ID 2005937-1
    ISSN 1520-5827 ; 0743-7463
    ISSN (online) 1520-5827
    ISSN 0743-7463
    DOI 10.1021/acs.langmuir.1c01765
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  5. Article ; Online: Interfacial properties of liquid metal immersed in various liquids.

    Ryu, Gaabhin / Park, Kwangseok / Kim, Hyoungsoo

    Journal of colloid and interface science

    2022  Volume 621, Page(s) 285–294

    Abstract: Hypothesis: When gallium-based liquid metal (LM) droplets are injected through different solvent media, the oxygen solubility of the environment influences the droplet eccentricity. The formation of an oxide membrane in solvents can determine whether a ... ...

    Abstract Hypothesis: When gallium-based liquid metal (LM) droplets are injected through different solvent media, the oxygen solubility of the environment influences the droplet eccentricity. The formation of an oxide membrane in solvents can determine whether a bulk-scale droplet behaves in a liquidlike or solidlike manner. In the case of LM emulsions, the solvent's oxygen solubility leads to varying degrees of organic solvent adsorption. The adsorption of solvent molecules changes the surface energy of the oxide layer.
    Experiments: The pinch-off frames of LM droplets immersed in liquids with differing oxygen solubility were captured using a high-speed camera. Through scanning electron microscopy (SEM) and energy-dispersive X-ray spectroscopy (EDS), the surface composition of micro and nanoscale LM emulsions in different solvents was investigated. The van Oss-Good model was implemented to determine the polar and nonpolar surface energy components of LM layers with adsorbates.
    Findings: Pear-shaped LM droplets displaying solidlike behavior are created when the mole fraction of dissolved oxygen in the ambient solution is above approximately 2.43×10
    Language English
    Publishing date 2022-04-11
    Publishing country United States
    Document type Journal Article
    ZDB-ID 241597-5
    ISSN 1095-7103 ; 0021-9797
    ISSN (online) 1095-7103
    ISSN 0021-9797
    DOI 10.1016/j.jcis.2022.04.037
    Database MEDical Literature Analysis and Retrieval System OnLINE

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    In stock of ZB MED Bonn / Germany

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  6. Article: Vapor Absorption and Marangoni Flows in Evaporating Drops

    Ryu, Junil / Ko, Han Seo / Kim, Hyoungsoo

    Langmuir. 2022 Feb. 11, v. 38, no. 7

    2022  

    Abstract: We experimentally and analytically studied vapor-driven solutal Marangoni flow by varying volatile liquid sources on top of the water droplet. We checked and compared the effects of solubility and vapor pressures of volatile liquids on the internal flow ... ...

    Abstract We experimentally and analytically studied vapor-driven solutal Marangoni flow by varying volatile liquid sources on top of the water droplet. We checked and compared the effects of solubility and vapor pressures of volatile liquids on the internal flow pattern using particle image velocimetry (PIV) and the droplet shape using shadowgraphy experiments. To explain the internal flow, we explored the absorption and evaporation mechanism of the vapors and we found that Henry’s constant of the volatile liquid is the primary factor. Based on the scaling arguments, we developed theoretical models to explain how much vapor is absorbed into the water droplet, and how the flow pattern occurs and evolves. The scaling models show that there is a good agreement with the experimental results. We believe that understanding this phenomenon is useful for microfluidics applications and fundamental liquid–gas interface problems where vapors can be absorbed into another liquid.
    Keywords absorption ; droplets ; evaporation ; liquids ; microfluidic technology ; particle image velocimetry ; solubility ; vapors
    Language English
    Dates of publication 2022-0211
    Size p. 2185-2191.
    Publishing place American Chemical Society
    Document type Article
    ZDB-ID 2005937-1
    ISSN 1520-5827 ; 0743-7463
    ISSN (online) 1520-5827
    ISSN 0743-7463
    DOI 10.1021/acs.langmuir.1c01765
    Database NAL-Catalogue (AGRICOLA)

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  7. Article: Interfacial properties of liquid metal immersed in various liquids

    Ryu, Gaabhin / Park, Kwangseok / Kim, Hyoungsoo

    Journal of colloid and interface science. 2022 Sept., v. 621

    2022  

    Abstract: When gallium-based liquid metal (LM) droplets are injected through different solvent media, the oxygen solubility of the environment influences the droplet eccentricity. The formation of an oxide membrane in solvents can determine whether a bulk-scale ... ...

    Abstract When gallium-based liquid metal (LM) droplets are injected through different solvent media, the oxygen solubility of the environment influences the droplet eccentricity. The formation of an oxide membrane in solvents can determine whether a bulk-scale droplet behaves in a liquidlike or solidlike manner. In the case of LM emulsions, the solvent’s oxygen solubility leads to varying degrees of organic solvent adsorption. The adsorption of solvent molecules changes the surface energy of the oxide layer. The pinch-off frames of LM droplets immersed in liquids with differing oxygen solubility were captured using a high-speed camera. Through scanning electron microscopy (SEM) and energy-dispersive X-ray spectroscopy (EDS), the surface composition of micro and nanoscale LM emulsions in different solvents was investigated. The van Oss-Good model was implemented to determine the polar and nonpolar surface energy components of LM layers with adsorbates. Pear-shaped LM droplets displaying solidlike behavior are created when the mole fraction of dissolved oxygen in the ambient solution is above approximately 2.43×10-4. For LM emulsions sonicated in organic solvents, Carbon/Oxygen (C/O) and Carbon/Gallium (C/Ga) atomic percent ratios display an increasing trend with increasing oxygen solubility. The nonpolar component of surface energy shows a logarithmic relationship with the oxygen solubility of the solvent used to treat the LM layer. The polar component of surface energy is more susceptible to the chemical properties of the solvent.
    Keywords adsorption ; cameras ; carbon ; dissolved oxygen ; droplets ; energy ; energy-dispersive X-ray analysis ; gallium ; liquids ; models ; oxygen ; solubility ; solvents
    Language English
    Dates of publication 2022-09
    Size p. 285-294.
    Publishing place Elsevier Inc.
    Document type Article
    ZDB-ID 241597-5
    ISSN 1095-7103 ; 0021-9797
    ISSN (online) 1095-7103
    ISSN 0021-9797
    DOI 10.1016/j.jcis.2022.04.037
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  8. Article ; Online: Controlling uniform patterns by evaporation of multi-component liquid droplets in a confined geometry.

    Pyeon, Jeongsu / Kim, Hyoungsoo

    Soft matter

    2020  Volume 17, Issue 13, Page(s) 3578–3585

    Abstract: Surface-coating technologies are important for a variety of applications, e.g. ink-jet printing, micro-electronic engineering and biological arrays. In this study, we introduce a novel idea to obtain uniform patterns with multi-component solution in a ... ...

    Abstract Surface-coating technologies are important for a variety of applications, e.g. ink-jet printing, micro-electronic engineering and biological arrays. In this study, we introduce a novel idea to obtain uniform patterns with multi-component solution in a confined geometry. When a droplet of the multi-component liquid evaporates in the confined area, the evaporated vapors are stagnated inside the confined chamber where the evaporated liquid molecule is much heavier than the ambient air. These vapors change internal flow in the droplet by generating Marangoni effects during evaporation, which help to obtain uniform deposition. Finally, we show that a coffee-ring is totally suppressed and a uniformly dried pattern is achieved. For a potential application as display panels, we use quantum dots and create a uniform light-emitting layer.
    Language English
    Publishing date 2020-12-15
    Publishing country England
    Document type Journal Article
    ZDB-ID 2191476-X
    ISSN 1744-6848 ; 1744-683X
    ISSN (online) 1744-6848
    ISSN 1744-683X
    DOI 10.1039/d0sm01872d
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  9. Article: Editorial: Topical Collection 'complex interactions with droplets'.

    Yarin, Alexander / Roisman, Ilia V / Kim, Hyoungsoo / Tropea, Cameron

    Experiments in fluids

    2022  Volume 63, Issue 5, Page(s) 78

    Language English
    Publishing date 2022-05-05
    Publishing country Germany
    Document type Editorial
    ZDB-ID 1476361-8
    ISSN 1432-1114 ; 0723-4864
    ISSN (online) 1432-1114
    ISSN 0723-4864
    DOI 10.1007/s00348-022-03428-3
    Database MEDical Literature Analysis and Retrieval System OnLINE

    Full text online

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  10. Article: Real-Time Visualization of Scent Accumulation Reveals the Frequency of Floral Scent Emissions.

    Kim, Hyoungsoo / Lee, Gilgu / Song, Junyong / Kim, Sang-Gyu

    Frontiers in plant science

    2022  Volume 13, Page(s) 835305

    Abstract: Flowers emit a bouquet of volatiles to attract pollinators or to protect flowers from pathogen and herbivore attacks. Most floral volatiles are synthesized in the cytoplasm of petals and released into the headspace at a specific time of day. Various ... ...

    Abstract Flowers emit a bouquet of volatiles to attract pollinators or to protect flowers from pathogen and herbivore attacks. Most floral volatiles are synthesized in the cytoplasm of petals and released into the headspace at a specific time of day. Various floral scent sampling methods coupled with gas chromatography-mass spectrometry have been used to measure the quality and quantity of floral volatiles. However, little is known about the emission patterns of floral scents. In most cases, it is still unclear whether floral scents emit continuously or discontinuously. Here we measured the frequency with which lily flowers emit scents using optical interferometry. By analyzing the refractive index difference between volatile organic compounds and ambient air, we were able to visualize the accumulation of the volatile vapors. The frequency of volatile emission was calculated from the unique footprint of temporal power spectrum maps. Based on these real-time measurements, we found that lily flowers emit the volatile compounds discontinuously, with pulses observed around every 10-50 min.
    Language English
    Publishing date 2022-04-18
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2613694-6
    ISSN 1664-462X
    ISSN 1664-462X
    DOI 10.3389/fpls.2022.835305
    Database MEDical Literature Analysis and Retrieval System OnLINE

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