Flattened and Wrinkled Encapsulated Droplets: Shape Morphing Induced by Gravity and Evaporation

Davide Riccobelli; Hedar H. Al-Terke; Päivi Laaksonen; Pierangelo Metrangolo; Arja Paananen; Robin H.A. Ras; Pasquale Ciarletta; Dominic Vella

doi:10.1103/PhysRevLett.130.218202

Flattened and Wrinkled Encapsulated Droplets: Shape Morphing Induced by Gravity and Evaporation

Davide Riccobelli, Hedar H. Al-Terke, Päivi Laaksonen, Pierangelo Metrangolo, Arja Paananen, Robin H.A. Ras, Pasquale Ciarletta, Dominic Vella^*

^*Corresponding author for this work

BA5304 Enzyme and material biotechnology

Research output: Contribution to journal › Article › Scientific › peer-review

11 Citations (Scopus)

Abstract

We report surprising morphological changes of suspension droplets (containing class II hydrophobin protein HFBI from Trichoderma reesei in water) as they evaporate with a contact line pinned on a rigid solid substrate. Both pendant and sessile droplets display the formation of an encapsulating elastic film as the bulk concentration of solute reaches a critical value during evaporation, but the morphology of the droplet varies significantly: for sessile droplets, the elastic film ultimately crumples in a nearly flattened area close to the apex while in pendant droplets, circumferential wrinkling occurs close to the contact line. These different morphologies are understood through a gravito-elastocapillary model that predicts the droplet morphology and the onset of shape changes, as well as showing that the influence of the direction of gravity remains crucial even for very small droplets (where the effect of gravity can normally be neglected). The results pave the way to control droplet shape in several engineering and biomedical applications.

Original language	English
Article number	218202
Journal	Physical Review Letters
Volume	130
Issue number	21
DOIs	https://doi.org/10.1103/PhysRevLett.130.218202
Publication status	Published - 26 May 2023
MoE publication type	A1 Journal article-refereed

Funding

This work has been partially supported by Ministero dell’Università e della Ricerca (Progetti di ricerca di Rilevante Interesse Nazionale (PRIN) Grant No. MATH4I4 2020F3NCPX), by Regione Lombardia (NEWMED Grant, ID: 117599, POR FESR 2014-2020), by GNFM–INdAM, by the Academy of Finland [Center of Excellence Program (2022-2029) in Life-Inspired Hybrid Materials (LIBER) Project No: 346109]. We also acknowledge the provision of facilities and technical support by Aalto University at the OtaNano Nanomicroscopy Center.

Keywords

Water
Solutions

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10.1103/PhysRevLett.130.218202Licence: CC BY

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title = "Flattened and Wrinkled Encapsulated Droplets: Shape Morphing Induced by Gravity and Evaporation",

abstract = "We report surprising morphological changes of suspension droplets (containing class II hydrophobin protein HFBI from Trichoderma reesei in water) as they evaporate with a contact line pinned on a rigid solid substrate. Both pendant and sessile droplets display the formation of an encapsulating elastic film as the bulk concentration of solute reaches a critical value during evaporation, but the morphology of the droplet varies significantly: for sessile droplets, the elastic film ultimately crumples in a nearly flattened area close to the apex while in pendant droplets, circumferential wrinkling occurs close to the contact line. These different morphologies are understood through a gravito-elastocapillary model that predicts the droplet morphology and the onset of shape changes, as well as showing that the influence of the direction of gravity remains crucial even for very small droplets (where the effect of gravity can normally be neglected). The results pave the way to control droplet shape in several engineering and biomedical applications.",

keywords = "Water, Solutions",

author = "Davide Riccobelli and Al-Terke, {Hedar H.} and P{\"a}ivi Laaksonen and Pierangelo Metrangolo and Arja Paananen and Ras, {Robin H.A.} and Pasquale Ciarletta and Dominic Vella",

note = "Funding Information: This work has been partially supported by Ministero dell{\textquoteright}Universit{\`a} e della Ricerca (Progetti di ricerca di Rilevante Interesse Nazionale (PRIN) Grant No. MATH4I4 2020F3NCPX), by Regione Lombardia (NEWMED Grant, ID: 117599, POR FESR 2014-2020), by GNFM–INdAM, by the Academy of Finland [Center of Excellence Program (2022-2029) in Life-Inspired Hybrid Materials (LIBER) Project No: 346109]. We also acknowledge the provision of facilities and technical support by Aalto University at the OtaNano Nanomicroscopy Center. Publisher Copyright: {\textcopyright} 2023 authors. Published by the American Physical Society. Published by the American Physical Society under the terms of the {"}https://creativecommons.org/licenses/by/4.0/{"}Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.",

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T2 - Shape Morphing Induced by Gravity and Evaporation

AU - Riccobelli, Davide

AU - Al-Terke, Hedar H.

AU - Laaksonen, Päivi

AU - Metrangolo, Pierangelo

AU - Paananen, Arja

AU - Ras, Robin H.A.

AU - Ciarletta, Pasquale

AU - Vella, Dominic

N1 - Funding Information: This work has been partially supported by Ministero dell’Università e della Ricerca (Progetti di ricerca di Rilevante Interesse Nazionale (PRIN) Grant No. MATH4I4 2020F3NCPX), by Regione Lombardia (NEWMED Grant, ID: 117599, POR FESR 2014-2020), by GNFM–INdAM, by the Academy of Finland [Center of Excellence Program (2022-2029) in Life-Inspired Hybrid Materials (LIBER) Project No: 346109]. We also acknowledge the provision of facilities and technical support by Aalto University at the OtaNano Nanomicroscopy Center. Publisher Copyright: © 2023 authors. Published by the American Physical Society. Published by the American Physical Society under the terms of the "https://creativecommons.org/licenses/by/4.0/"Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.

PY - 2023/5/26

Y1 - 2023/5/26

N2 - We report surprising morphological changes of suspension droplets (containing class II hydrophobin protein HFBI from Trichoderma reesei in water) as they evaporate with a contact line pinned on a rigid solid substrate. Both pendant and sessile droplets display the formation of an encapsulating elastic film as the bulk concentration of solute reaches a critical value during evaporation, but the morphology of the droplet varies significantly: for sessile droplets, the elastic film ultimately crumples in a nearly flattened area close to the apex while in pendant droplets, circumferential wrinkling occurs close to the contact line. These different morphologies are understood through a gravito-elastocapillary model that predicts the droplet morphology and the onset of shape changes, as well as showing that the influence of the direction of gravity remains crucial even for very small droplets (where the effect of gravity can normally be neglected). The results pave the way to control droplet shape in several engineering and biomedical applications.

AB - We report surprising morphological changes of suspension droplets (containing class II hydrophobin protein HFBI from Trichoderma reesei in water) as they evaporate with a contact line pinned on a rigid solid substrate. Both pendant and sessile droplets display the formation of an encapsulating elastic film as the bulk concentration of solute reaches a critical value during evaporation, but the morphology of the droplet varies significantly: for sessile droplets, the elastic film ultimately crumples in a nearly flattened area close to the apex while in pendant droplets, circumferential wrinkling occurs close to the contact line. These different morphologies are understood through a gravito-elastocapillary model that predicts the droplet morphology and the onset of shape changes, as well as showing that the influence of the direction of gravity remains crucial even for very small droplets (where the effect of gravity can normally be neglected). The results pave the way to control droplet shape in several engineering and biomedical applications.

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KW - Solutions

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JF - Physical Review Letters

IS - 21

M1 - 218202

ER -

Flattened and Wrinkled Encapsulated Droplets: Shape Morphing Induced by Gravity and Evaporation

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