Deposit pattern of inkjet printed Pico-liter droplet

Taewo Ong Lim, Jungkeun Yang, Seungmi Lee, Jaewon Chung, Daehie Hong

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

The deposit pattern of an evaporating picoliter droplet is studied changing the solvents (water, diethylene glycol, and formamide), mixing composition of the solvents and substrate temperature. When depinning occurs in the early stage of the evaporation period, concentrated solute (or partially deposited solute, if any) also retracts with the receding droplet, resulting in dome shaped deposit patterns. When pinning is maintained during most of the evaporation period, either a ring deposit or a relatively uniform deposit is obtained depending on the type of solvent and heating condition. These results are explained by interplay of (1) radial outward flow due to the strong evaporation flux at the contact line of a sessile droplet, (2) inward Marangoni flow due to evaporative cooling and solvent concentration gradient, and (3) solute mixing by diffusion in liquid.

Original languageEnglish
Pages (from-to)827-833
Number of pages7
JournalInternational Journal of Precision Engineering and Manufacturing
Volume13
Issue number6
DOIs
Publication statusPublished - 2012 Jun

Keywords

  • Coffee Ring
  • Deposit
  • Diffusion
  • Evaporation
  • Inkjet Printing
  • Marangoni Flow
  • Pico-liter Droplet
  • Solute

ASJC Scopus subject areas

  • Mechanical Engineering
  • Industrial and Manufacturing Engineering
  • Electrical and Electronic Engineering

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