Capillary instability in screen-printed micropatterns. Issue 10 (20th February 2023)

• Record Type: Journal Article
• Authors: Bae, Jung Gun; Kim, Ji Hoon; Shin, Kyusoon; Lee, Won Bo
• Is Part Of: Soft matter. Volume 19:Issue 10(2023)
• Page Start: 1907
• Page End: 1912
• Publication Date: 2023-02-20
• Subjects: Soft condensed matter -- Periodicals; 530.413
• DOI: 10.1039/d3sm00024a
• Languages: English
• ISSNs: 1744-683X

Abstract

Abstract : Capillary instability and broadening effect in screen-printed micropatterns. Abstract : Screen printing (SP) has been extensively studied owing to its widespread industrial applications; however, only a few studies have focused on the substrate effect. Herein, we demonstrate that a screen-printed line can undergo a broadening effect or lateral undulation, which is determined by the substrate and printed dimensions. The degree of spreading was systematically investigated by employing 1D and 2D geometrical parameters. Based on the liquidity of the ink, we developed a simple inviscid theory with imposed perturbation to analyze the instability of screen-printed lines. The dispersion relation was derived to estimate the geometry of the laterally undulated lines and compared with the experimental results. The proposed argument is particularly applicable to a regime in which SP inks have greater liquidity. The screen-printed patterns exhibited unique undulated shapes and were utilized as photomasks for the facile fabrication of raccoon-type microchannels.