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Evaporation of binary-mixture liquid droplets: picoliter pancakes [videos and dataset] Open Access

Small multicomponent droplets are of increasing importance in a plethora of technological applications ranging from the fabrication of self-assembled hierarchical patterns to the design of autonomous fluidic systems. While often far away from equilibrium, involving complex and even chaotic flow fi elds, it is commonly assumed that in these systems with small drops surface tension keeps the shapes spherical. Here, studying picoliter volatile binary-mixture droplets of isopropanol and 2-butanol, we show that the dominance of surface tension forces at small scales can play a dual role: minute variations in surface tension along the interface can create Marangoni flows that are strong enough to signi cantly deform the drop, forming micron-thick pancake-like shapes that are otherwise typical of large puddles. We identify the conditions under which these attened shapes form and explain why, universally, they relax back to a spherical-cap shape towards the end of drop lifetime. We further show that the formation of pancake-like droplets suppresses the 'coffee-ring' e ect and leads to uniform deposition of suspended particles. The quantitative agreement between theory and experiment provides a predictive capability to modulate the shape of tiny droplets with implications in a range of technologies from fabrication of miniature optical lenses to coating, printing and pattern deposition.

Descriptions

Resource type
Dataset
Contributors
Creator: Yang, Lisong 1
Contact person: Yang, Lisong 1
Data collector: Yang, Lisong 1
Contact person: Bain, Colin D. 1
Editor: Bain, Colin D. 1
1 Durham University, United Kingdom
Funder
The Engineering and Physical Sciences Research Council (EPSRC)
Research methods
Lubrication approximation, flim interferometry, inkjet printing technology
Other description
Keyword
Fluid dynamics
Marangoni flow
Capillary flow
Wetting
Coffee-ring
Subject
Surface chemistry
Location
Language
English
Cited in
Identifier
ark:/32150/r1bk1289931
doi:10.15128/r1bk1289931
Rights
Creative Commons Attribution 4.0 International (CC BY)

Publisher
Durham University
Date Created

File Details

Depositor
L. Yang
Date Uploaded
Date Modified
9 June 2021, 09:06:17
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Characterization
File format: zip (ZIP Format)
Mime type: application/zip
File size: 2718319601
Last modified: 2021:04:24 22:27:57+01:00
Filename: DRO-DATA.zip
Original checksum: ac7c7df209dc35e44a0c6bf4b4eb5dc1
Activity of users you follow
User Activity Date
User L. Yang has updated Evaporation of binary-mixture liquid droplets: picoliter pancakes [videos and dataset] 16 days ago
User L. Yang has updated Evaporation of binary-mixture liquid droplets: picoliter pancakes [videos and dataset] about 1 month ago
User L. Yang has updated Evaporation of binary-mixture liquid droplets: picoliter pancakes [videos and dataset] about 1 month ago
User L. Yang has updated Evaporation of binary-mixture liquid droplets: picoliter pancakes [videos and dataset] about 1 month ago
User L. Yang has updated Evaporation of binary-mixture liquid droplets: picoliter pancakes [videos and dataset] 2 months ago
User L. Yang has deposited DRO-DATA.zip 2 months ago