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Buckling and Drying Kinetics of Particle-Stabilized Water Droplets Fully or Partially Immersed in an Oil Layer

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    Buckling and Drying Kinetics of Particle-Stabilized Water Droplets Fully or Partially Immersed in an Oil Layer
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    • Kohei Abe
      Kohei Abe
      Graduate School of Bio-Applications and Systems Engineering, Tokyo University of Agriculture and Technology, 2-24-16 Nakacho, Koganei, Tokyo 184-8588, Japan
      More by Kohei Abe
      Orcidhttp://orcid.org/0000-0003-3052-6057
    • Susumu Inasawa*
      Susumu Inasawa
      Graduate School of Bio-Applications and Systems Engineering, Tokyo University of Agriculture and Technology, 2-24-16 Nakacho, Koganei, Tokyo 184-8588, Japan
      Department of Applied Physics and Chemical Engineering, Tokyo University of Agriculture and Technology, 2-24-16 Nakacho, Koganei, Tokyo 184-8588, Japan
      *Email: [email protected]
      More by Susumu Inasawa
      Orcidhttp://orcid.org/0000-0003-4643-0586
    Other Access OptionsSupporting Information (8)

    Langmuir

    Cite this: Langmuir 2021, 37, 1, 219–229
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    https://doi.org/10.1021/acs.langmuir.0c02800
    Published December 29, 2020
    Copyright 2020 © 2021 American Chemical Society
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    Abstract

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    We have investigated the effect of buckling of particle-stabilized water droplets on the drying kinetics. Particle-stabilized water droplets in an oil phase were prepared and the shrinking modes of the droplets during drying were controlled by the wettability of the particles. We obtained water droplets with and without buckling and used them in drying experiments. The drying times were comparable when the droplets were fully immersed in a thick oil layer. However, when the thickness of the oil layer was smaller than the droplet diameter, the buckled droplets showed faster drying. Observation of the reflection images around the droplets suggested that the buckled droplets preferentially shrank in the height direction, while the droplets without buckling isotropically shrank. Mathematical models that assumed diffusion of dissolved water molecules in the oil layer showed good agreement with the experimental data. The effective water–oil interfacial area was constant in the buckled droplets, whereas it shrank in the droplets without buckling. This would be a reason for the faster drying of the partially immersed buckled droplets. Particulate shells on liquid droplets could be used to enhance droplet drying.

    Copyright 2020 © 2021 American Chemical Society

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    Supporting Information

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    The Supporting Information is available free of charge at https://pubs.acs.org/doi/10.1021/acs.langmuir.0c02800.

    • Figure S1, mode 1 droplets in a standard and in a faster drying condition and mode 3 droplets in the standard and in a slower drying condition; Figure S2, aging periods and shrinking modes of drying droplets prepared with various particle weight fractions; Figure S3, reflection images of water droplets fully or partially immersed in an oil layer; Figure S4, changes of the Feret diameters of droplets in mode 3, which are not shown in Figure 8 but plotted in the inset of Figure 8 in the main text (PDF)

    • Movie S1, drying particle-stabilized droplets in mode 1, where 1 s corresponds to 200 s in real time (MP4)

    • Movie S2, drying particle-stabilized droplets in mode 2, where 1 s corresponds to 200 s in real time (MP4)

    • Movie S3, drying particle-stabilized droplets in mode 3, where 1 s corresponds to 200 s in real time (MP4)

    • Movie S4, drying particle-stabilized droplets in mode 1 where the stabilizing particles were observed to peel off from the oil–water interfaces and 1 s corresponds to 200 s in real time (MP4)

    • Movie S5, drying particle-stabilized droplets prepared from the water-treated particles, where 1 s corresponds to 200 s in real time (MP4)

    • Movie S6, drying droplets in mode 1 in the reflection images, where 1 s corresponds to 100 s in real time (MP4)

    • Movie S7, drying droplets in mode 3 in the reflection images, where 1 s corresponds to 100 s in real time (MP4)

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    This article is cited by 8 publications.

    1. Lioudmila V. Sorokina, Abhijit H. Phakatkar, Tolou Shokuhfar, Reza Shahbazian-Yassar. Nanoscale Growth and Densification of Calcium Oxalate Crystals. Crystal Growth & Design 2023, 23 (12) , 8554-8564. https://doi.org/10.1021/acs.cgd.3c00582
    2. Sanket Kumar, Deniz Z. Gunes, Erin Koos. Evaporation induced destabilization of oil-in-water Pickering emulsions. Journal of Colloid and Interface Science 2025, 699 , 138165. https://doi.org/10.1016/j.jcis.2025.138165
    3. Jing Su, Mengting Yang, Zhengfeng He, Yu Guan, Shaohai Fu. The effect of particle size and dispersity index on the drying behavior of colloidal microdroplets. Colloids and Surfaces A: Physicochemical and Engineering Aspects 2025, 708 , 135965. https://doi.org/10.1016/j.colsurfa.2024.135965
    4. Susumu INASAWA. Drying Phenomena in Emulsions and Colloidal Suspensions. Oleoscience 2025, 25 (6) , 241-245. https://doi.org/10.5650/oleoscience.25.241
    5. Katsuyuki Hasegawa, Susumu Inasawa. Spontaneous transfer of amphiphilic molecules from evaporating water to involatile oil and its effects on the rate of water evaporation. International Journal of Heat and Mass Transfer 2023, 208 , 124053. https://doi.org/10.1016/j.ijheatmasstransfer.2023.124053
    6. Maheshwar Gopu, Dileep Mampallil. Distributed evaporation of water-in-oil emulsion drops on solid surfaces. Physics of Fluids 2022, 34 (10) https://doi.org/10.1063/5.0107471
    7. Chisato Tajima, Susumu Inasawa. Effects of liquid–liquid interfaces on flow of oil-in-water emulsions in a capillary tube. Chemical Engineering Science 2022, 250 , 117394. https://doi.org/10.1016/j.ces.2021.117394
    8. Susumu INASAWA. Recent Studies on Drying-Related Phenomena: Compression, Formation of Solid Films, Deformation of Interfaces and Generation of Spontaneous Flows in Drying Suspensions. Journal of the Japan Society of Colour Material 2021, 94 (5) , 133-139. https://doi.org/10.4011/shikizai.94.133
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    Langmuir

    Cite this: Langmuir 2021, 37, 1, 219–229
    Click to copy citationCitation copied!
    https://doi.org/10.1021/acs.langmuir.0c02800
    Published December 29, 2020
    Copyright 2020 © 2021 American Chemical Society
    Request reuse permissions

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