Citation: Dong Lv, Xuelei Liu, Wei Li, Qiang Zhang, Xinhong Yu, Yanchun Han. Single droplet formation by controlling the viscoelasticity of polymer solutions during inkjet printing[J]. Chinese Chemical Letters, ;2024, 35(6): 109401. doi: 10.1016/j.cclet.2023.109401 shu

Single droplet formation by controlling the viscoelasticity of polymer solutions during inkjet printing

Dong Lv ^{a, b} ,
Xuelei Liu ^{a, b} ,
Wei Li ^{a, b} ,
Qiang Zhang ^a ,
Xinhong Yu ^{a, *,} ,
Yanchun Han ^{a, b, *,}

a.
State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China
b.
School of Applied Chemistry and Engineering, University of Science and Technology of China, Hefei 230026, China

xhyu@ciac.ac.cn

ychan@ciac.ac.cn

Received Date: 14 November 2023
Revised Date: 14 December 2023
Accepted Date: 15 December 2023
Available Online: 19 December 2023

Figures(5)

Inkjet printing has emerged as a potential solution processing method for large-area patterned films. During inkjet printing, a single droplet without satellite droplet is required for high-quality film. Herein, we propose a strategy for obtaining a single droplet by adjusting the reduced concentration (c/c^*, where c^* is the critical overlap concentration) in the range of 1.0–1.5. Droplet formation can be categorized into three distinct regimes: (1) c/c^* < 1.0, satellite droplet; (2) c/c^* = 1.0–1.5, single droplet; (3) c/c^* > 2.0, no droplet. Furthermore, an inertial-capillary balance led to the 2/3-power scaling of the minimum radius with time for the solutions of c/c^* < 1.0. However, for the solutions of c/c^* = 1.0–1.5, the ligament radius decreased exponentially with time. Moreover, the Weissenberg number was higher than the critical value of 0.5, indicating that the polymer chains underwent coil-stretch transition. The viscoelastic-capillary balance dominated instead of the inertial-capillary balance. The resulting viscoelastic resistance reduced the length of the ligament and increased the velocity difference between the satellite and main droplets. Consequently, a single droplet was formed. In addition, the law can be successfully generalized to various molecular weights, molecular structures and solvents.
- Inkjet printing,
- Single droplet,
- Satellite droplet,
- Viscoelasticity,
- Coil-stretch
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