Evaporation and deposition of inclined colloidal droplets

Abstract Colloidal droplets on flat solid substrates commonly leave symmetric ring-like deposits due to coffee-ring flows during evaporation. On inclined substrates, droplet shapes may become asymmetric by gravity. On this basis, it is not clear how their evaporation dynamics and final deposits are...

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Autores principales:	Jin Young Kim, Marta Gonçalves, Narina Jung, Hyoungsoo Kim, Byung Mook Weon
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/5f69f3c099de4ed98bbaf5a41e37da5e
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spelling	oai:doaj.org-article:5f69f3c099de4ed98bbaf5a41e37da5e2021-12-02T19:12:25ZEvaporation and deposition of inclined colloidal droplets10.1038/s41598-021-97256-w2045-2322https://doaj.org/article/5f69f3c099de4ed98bbaf5a41e37da5e2021-09-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-97256-whttps://doaj.org/toc/2045-2322Abstract Colloidal droplets on flat solid substrates commonly leave symmetric ring-like deposits due to coffee-ring flows during evaporation. On inclined substrates, droplet shapes may become asymmetric by gravity. On this basis, it is not clear how their evaporation dynamics and final deposits are changed depending on inclination. Here we explore evaporation and deposition dynamics of colloidal droplets on inclined substrates, mainly by controlling colloidal particle size, substrate inclination, and relative humidity, which are crucial to gravitational intervention and evaporation dynamics. We experimentally investigate two different flows with opposite directions: downward sedimentation flows by gravity ( $$v_s$$ v s ) and upward capillary flows by evaporation ( $$v_c$$ v c ). We find that the competition of two flows determines the formation of final deposits with a flow speed ratio of $$\alpha = v_s/v_c$$ α = v s / v c . Notably, for $$\alpha$$ α $$\ll$$ ≪ 1, evaporation-driven upward flows overwhelm sedimentation-driven downward flows, resulting in accentuated particle movement towards the top ring, which seems to defy gravitational intervention. We suggest a possible explanation for the flow speed dependence of final deposits in evaporating colloidal droplets. This study offers a framework to understand the intervention of inclination to the formation of final deposits and how to overcome the deposit pattern radial asymmetry, achieving symmetric deposit widths from inclined colloidal droplets.Jin Young KimMarta GonçalvesNarina JungHyoungsoo KimByung Mook WeonNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-9 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Jin Young Kim Marta Gonçalves Narina Jung Hyoungsoo Kim Byung Mook Weon Evaporation and deposition of inclined colloidal droplets
description	Abstract Colloidal droplets on flat solid substrates commonly leave symmetric ring-like deposits due to coffee-ring flows during evaporation. On inclined substrates, droplet shapes may become asymmetric by gravity. On this basis, it is not clear how their evaporation dynamics and final deposits are changed depending on inclination. Here we explore evaporation and deposition dynamics of colloidal droplets on inclined substrates, mainly by controlling colloidal particle size, substrate inclination, and relative humidity, which are crucial to gravitational intervention and evaporation dynamics. We experimentally investigate two different flows with opposite directions: downward sedimentation flows by gravity ( $$v_s$$ v s ) and upward capillary flows by evaporation ( $$v_c$$ v c ). We find that the competition of two flows determines the formation of final deposits with a flow speed ratio of $$\alpha = v_s/v_c$$ α = v s / v c . Notably, for $$\alpha$$ α $$\ll$$ ≪ 1, evaporation-driven upward flows overwhelm sedimentation-driven downward flows, resulting in accentuated particle movement towards the top ring, which seems to defy gravitational intervention. We suggest a possible explanation for the flow speed dependence of final deposits in evaporating colloidal droplets. This study offers a framework to understand the intervention of inclination to the formation of final deposits and how to overcome the deposit pattern radial asymmetry, achieving symmetric deposit widths from inclined colloidal droplets.
format	article
author	Jin Young Kim Marta Gonçalves Narina Jung Hyoungsoo Kim Byung Mook Weon
author_facet	Jin Young Kim Marta Gonçalves Narina Jung Hyoungsoo Kim Byung Mook Weon
author_sort	Jin Young Kim
title	Evaporation and deposition of inclined colloidal droplets
title_short	Evaporation and deposition of inclined colloidal droplets
title_full	Evaporation and deposition of inclined colloidal droplets
title_fullStr	Evaporation and deposition of inclined colloidal droplets
title_full_unstemmed	Evaporation and deposition of inclined colloidal droplets
title_sort	evaporation and deposition of inclined colloidal droplets
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/5f69f3c099de4ed98bbaf5a41e37da5e
work_keys_str_mv	AT jinyoungkim evaporationanddepositionofinclinedcolloidaldroplets AT martagoncalves evaporationanddepositionofinclinedcolloidaldroplets AT narinajung evaporationanddepositionofinclinedcolloidaldroplets AT hyoungsookim evaporationanddepositionofinclinedcolloidaldroplets AT byungmookweon evaporationanddepositionofinclinedcolloidaldroplets
_version_	1718377049189515264

Evaporation and deposition of inclined colloidal droplets

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