The coffee-ring effect is a phenomenon in which particles are deposited on a contact line during the evaporation of a particle-laden sessile droplet. In this study, a patterned contact-angle substrate was designed using lattice Boltzmann simulation to suppress the coffee-ring effect. The simulation model was a combination of multiphase flow, heat transfer, and nanoparticle dynamics models. The simulation results repeatedly showed the contact line of the evaporating droplet on the patterned substrate during pinning and depinning. The contact line dynamics also affected the particle distribution. A multi-ring pattern was observed on the patterned substrate compared to the particle distribution on a substrate with a constant contact angle. This was a result of the repeated pinning and depinning of the contact line, and it was compared using the particle uniformity index presented in this study. This revealed a particle distribution that was 4.24-fold more uniform than the coffee-ring pattern. In subsequent pattern optimization, the particle uniformities of 51 cases with different geometries were measured. The pinning time in each patterned area of the case with the most uniform particle distribution was measured. Other factors, in addition to the pinning time, affected particle deposition, and the internal flow of the droplet was further analyzed. Within the droplet, the Marangoni flow generally decreased with continuous oscillations, whereas the capillary flow increased sharply in the region with a receding angle of 45°. This sharp increase in the capillary flow caused the particles trapped in the Marangoni flow to escape and increased the deposition rate.
Skip Nav Destination
Article navigation
November 2024
Research Article|
November 01 2024
Suppression of the coffee-ring effect using a contact-angle radial-band-patterned substrate: A lattice Boltzmann study
Hee Min Lee (이희민)
;
Hee Min Lee (이희민)
(Conceptualization, Data curation, Formal analysis, Investigation, Methodology, Software, Validation, Visualization, Writing – original draft)
1
Division of Inkjet Printing Solutions, Department of Mechanical Engineering, Yonsei University
, Seoul 03722, Republic of Korea
Search for other works by this author on:
Joon Sang Lee (이준상)
Joon Sang Lee (이준상)
a)
(Conceptualization, Formal analysis, Funding acquisition, Project administration, Resources, Supervision)
1
Division of Inkjet Printing Solutions, Department of Mechanical Engineering, Yonsei University
, Seoul 03722, Republic of Korea
2
Center for Hemodynamic Precision Medical Platform
, Seoul 03722, Republic of Korea
a)Author to whom correspondence should be addressed: [email protected]
Search for other works by this author on:
a)Author to whom correspondence should be addressed: [email protected]
Physics of Fluids 36, 113304 (2024)
Article history
Received:
July 24 2024
Accepted:
October 09 2024
Citation
Hee Min Lee, Joon Sang Lee; Suppression of the coffee-ring effect using a contact-angle radial-band-patterned substrate: A lattice Boltzmann study. Physics of Fluids 1 November 2024; 36 (11): 113304. https://doi.org/10.1063/5.0230433
Download citation file:
Pay-Per-View Access
$40.00
Sign In
You could not be signed in. Please check your credentials and make sure you have an active account and try again.
190
Views
Citing articles via
On Oreology, the fracture and flow of “milk's favorite cookie®”
Crystal E. Owens, Max R. Fan (范瑞), et al.
Physics-informed neural networks for solving Reynolds-averaged Navier–Stokes equations
Hamidreza Eivazi, Mojtaba Tahani, et al.
Chinese Academy of Science Journal Ranking System (2015–2023)
Cruz Y. Li (李雨桐), 李雨桐, et al.
Related Content
Particle deposition dynamics in evaporating droplets using lattice Boltzmann and magnetic particle simulation
Physics of Fluids (December 2023)
Neutralizing coffee-ring effect using gradual structures for uniform particle distribution
Physics of Fluids (March 2024)
Drop-on-demand assessment of microdrops of dilute ZnO–water nanofluids
Physics of Fluids (January 2021)
Improved performance of inkjet-printed Ag source/drain electrodes for organic thin-film transistors by overcoming the coffee ring effects
AIP Advances (November 2017)
Substrate stiffness affects particle distribution pattern in a drying suspension droplet
Appl. Phys. Lett. (June 2019)