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Publisher DOI: 10.1016/j.jcis.2021.03.017
Title: Direct writing of colloidal suspensions onto inclined surfaces: optimizing dispense volume for homogeneous structures
Language: English
Authors: Winhard, Benedikt 
Haugg, Stefanie 
Blick, Robert H. 
Schneider, Gerold A. 
Pagnan Furlan, Kaline  
Keywords: Colloidal suspension; Confinement effect; Direct writing; Inclined surface; Photonic structure; Self-assembly; Surface capturing effect
Issue Date: 10-Mar-2021
Publisher: Elsevier
Source: Journal of Colloid and Interface Science 597: 137-148 (2021-09-01)
Abstract (english): 
Hypothesis: A process to fabricate structures on inclined substrates has the potential to yield novel applications for colloidal-based structures. However, for conventional techniques, besides the coffee ring effect (CRE), anisotropic particle deposition along the inclination direction (IE) is expected to occur. We hypothesize that both effects can be inhibited by reducing the dispense volume during printing by direct writing. Experiments: We combined an additive manufacturing technique, namely direct writing, with colloidal assembly (AMCA) for an automated and localized drop-cast of polystyrene and silica suspensions onto inclined surfaces. Herein, we investigated the influence of the substrate tilting angle and the dispense volume on the printing of colloids and the resulting structures’ morphology. Findings: The results demonstrate that a reduction in the dispense volume hinders the CRE and IE for both particles’ systems, even though the evaporation mode is different. For polystyrene, the droplets evaporated solely in stick-mode, enabling a “surface capturing effect”, while for silica, droplets evaporated in mixed stick–slip mode and a “confinement effect” was observed, which improved uniformity of the deposition. These findings were used to generate a model of the critical droplet radius needed to print homogeneous colloidal-based structures onto inclined substrates.
DOI: 10.15480/882.3478
ISSN: 0021-9797
Journal: Journal of colloid and interface science 
Institute: Keramische Hochleistungswerkstoffe M-9 
Integrated Ceramic-based Materials Systems M-EXK3 
Document Type: Article
Project: SFB 986: Teilprojekt C4 - Deposition, Ordnung und mechanische Stabilität von Beschichtungen aus assemblierten Partikeln mit enger Größenverteilung 
Funded by: Deutsche Forschungsgemeinschaft (DFG) 
License: CC BY 4.0 (Attribution) CC BY 4.0 (Attribution)
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