University of Oulu

Rafal Sliz, Jakub Czajkowski, and Tapio Fabritius, Langmuir 2020 36 (32), 9562-9570, DOI: 10.1021/acs.langmuir.0c01560

Taming the coffee ring effect : enhanced thermal control as a method for thin-film nanopatterning

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Author: Sliz, Rafal1; Czajkowski, Jakub1,2; Fabritius, Tapio1
Organizations: 1Optoelectronics and Measurement Techniques Unit, Faculty of Information Technology and Electrical Engineering, University of Oulu, 90570 Oulu, Finland
2Microsoft, HoloLens Optics Finland, 02150 Espoo, Finland
Format: article
Version: published version
Access: open
Online Access: PDF Full Text (PDF, 6 MB)
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Language: English
Published: American Chemical Society, 2020
Publish Date: 2020-09-16


Predicting and controlling a droplet’s behavior on surfaces is very complex due to several factors affecting its nature. These factors play a crucial role in colloidal material deposition and related solution-based manufacturing methods such as printing. A better understanding of the processes governing the droplet in the picoliter regime is needed to help develop novel thin-film manufacturing methods and improve the current ones. This study introduces the substrate temperature as a method to control the droplet’s behavior during inkjet printing, especially the coffee-ring phenomena, at an unprecedented temperature range (25—250 °C). To explain the particular behavior of the droplet, this research associates the creation of specific coffee-ring micro/nanostructures at elevated temperatures with the Leidenfrost effect that is responsible for creating a vapor pocket under the drying drop. Herein, we combine experimental data and numerical methods to explain the drying dynamic of the picoliter-size droplet on the substrate at elevated temperatures. The achieved results indicate that the coffee-ring effect is correlated with the heat-transfer changes caused by the Leidenfrost effect and can be controlled and used to produce micro/nanostructured thin films without additional processing steps.

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Series: Langmuir
ISSN: 0743-7463
ISSN-E: 1520-5827
ISSN-L: 0743-7463
Volume: 36
Issue: 32
Pages: 9562 - 9570
DOI: 10.1021/acs.langmuir.0c01560
Type of Publication: A1 Journal article – refereed
Field of Science: 216 Materials engineering
221 Nanotechnology
213 Electronic, automation and communications engineering, electronics
Funding: This research was supported by a postdoctoral research fellow grant from the Academy of Finland (grant no. 296890). The authors also express their gratitude for the financial support received from the Academy of Finland’s FIRI funding (grant no. 320017). The authors thank Flavia Dinca for her comments and contribution.
Academy of Finland Grant Number: 296890
Detailed Information: 296890 (Academy of Finland Funding decision)
320017 (Academy of Finland Funding decision)
Copyright information: © The Authors 2020. This is an open access article published under a Creative Commons Attribution (CC-BY) License, which permits unrestricted use, distribution and reproduction in any medium, provided the author and source are cited.