Wetting geometry and deposition patterns manipulation with bi-dispersed particle-laden droplets

Polygonal deposition through evaporation of the suspension droplets holds promise for printing applications. The distinctive edges present in polygonal droplets offer the potential to enhance printing resolution and enable the fabrication of diverse thin depositions. Prior investigations revolve one...

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Main Authors: Lim, Si Xian, Teo, Alistair Guo Hao, Ong, Kian-Soo, Chong, Karen Siew Ling, Duan, Fei
Other Authors: School of Mechanical and Aerospace Engineering
Format: Article
Language:English
Published: 2024
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Online Access:https://hdl.handle.net/10356/179149
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Institution: Nanyang Technological University
Language: English
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spelling sg-ntu-dr.10356-1791492024-07-22T02:39:11Z Wetting geometry and deposition patterns manipulation with bi-dispersed particle-laden droplets Lim, Si Xian Teo, Alistair Guo Hao Ong, Kian-Soo Chong, Karen Siew Ling Duan, Fei School of Mechanical and Aerospace Engineering Singapore Centre for 3D Printing Engineering Particle self-assembly Bi-dispersed particle-laden droplet Polygonal deposition through evaporation of the suspension droplets holds promise for printing applications. The distinctive edges present in polygonal droplets offer the potential to enhance printing resolution and enable the fabrication of diverse thin depositions. Prior investigations revolve one dimensional control with the types of wetting geometries and deposition patterns initiate from different driving factors. The current study delves into the synergistic interplay between a bi-dispersed suspension mixing ratio and particle concentration, as they collectively influence the deposition pattern of octagonal droplets formed using a micropyramid cavity patterned substrate. The investigation culminates in the development of a comprehensive phase diagram categorizing four distinct types of deposition: octagonal outer-ring deposition, octagonal ring with irregular features, octagonal uniform deposition, and central deposition. Specifically, octagonal outer-ring deposition is observed when droplets consist predominantly of 3μm particles at lower concentrations. In cases where a suspension contains 10μm particles, an intermediate concentration exceeding 50% gives a rise to the octagonal outer-ring deposition intermingled with irregular features. The octagonal uniform deposition emerges when 3μm particles, co-aggregated with 10μm particles, are compelled to settle at the deposition center within the mixture at the 3:1 ratio at 1.0 wt% and 2.6 wt%. Notably, the “curvature effect”, exhibited by the aggregates adhering to the liquid–air interface, counter-intuitively suppresses octagonal deposition despite the presence of octagonal wetting geometry and forms the central deposition. In summary, the study introduces a robust method to achieve the uniform deposition and proposes a scalable and flexible strategy for generating diverse deposition types through the judicious mixing of two suspension solutions at distinct weight ratios. Nanyang Technological University The authors acknowledge the support of Singapore Center for 3D Printing (SC3DP) and School of Mechanical and Aerospace Engineering at Nanyang Technological University, Singapore. 2024-07-22T02:39:11Z 2024-07-22T02:39:11Z 2024 Journal Article Lim, S. X., Teo, A. G. H., Ong, K., Chong, K. S. L. & Duan, F. (2024). Wetting geometry and deposition patterns manipulation with bi-dispersed particle-laden droplets. Colloids and Surfaces A: Physicochemical and Engineering Aspects, 692, 133884-. https://dx.doi.org/10.1016/j.colsurfa.2024.133884 0927-7757 https://hdl.handle.net/10356/179149 10.1016/j.colsurfa.2024.133884 2-s2.0-85190466512 692 133884 en Colloids and Surfaces A: Physicochemical and Engineering Aspects © 2024 Elsevier B.V. All rights reserved.
institution Nanyang Technological University
building NTU Library
continent Asia
country Singapore
Singapore
content_provider NTU Library
collection DR-NTU
language English
topic Engineering
Particle self-assembly
Bi-dispersed particle-laden droplet
spellingShingle Engineering
Particle self-assembly
Bi-dispersed particle-laden droplet
Lim, Si Xian
Teo, Alistair Guo Hao
Ong, Kian-Soo
Chong, Karen Siew Ling
Duan, Fei
Wetting geometry and deposition patterns manipulation with bi-dispersed particle-laden droplets
description Polygonal deposition through evaporation of the suspension droplets holds promise for printing applications. The distinctive edges present in polygonal droplets offer the potential to enhance printing resolution and enable the fabrication of diverse thin depositions. Prior investigations revolve one dimensional control with the types of wetting geometries and deposition patterns initiate from different driving factors. The current study delves into the synergistic interplay between a bi-dispersed suspension mixing ratio and particle concentration, as they collectively influence the deposition pattern of octagonal droplets formed using a micropyramid cavity patterned substrate. The investigation culminates in the development of a comprehensive phase diagram categorizing four distinct types of deposition: octagonal outer-ring deposition, octagonal ring with irregular features, octagonal uniform deposition, and central deposition. Specifically, octagonal outer-ring deposition is observed when droplets consist predominantly of 3μm particles at lower concentrations. In cases where a suspension contains 10μm particles, an intermediate concentration exceeding 50% gives a rise to the octagonal outer-ring deposition intermingled with irregular features. The octagonal uniform deposition emerges when 3μm particles, co-aggregated with 10μm particles, are compelled to settle at the deposition center within the mixture at the 3:1 ratio at 1.0 wt% and 2.6 wt%. Notably, the “curvature effect”, exhibited by the aggregates adhering to the liquid–air interface, counter-intuitively suppresses octagonal deposition despite the presence of octagonal wetting geometry and forms the central deposition. In summary, the study introduces a robust method to achieve the uniform deposition and proposes a scalable and flexible strategy for generating diverse deposition types through the judicious mixing of two suspension solutions at distinct weight ratios.
author2 School of Mechanical and Aerospace Engineering
author_facet School of Mechanical and Aerospace Engineering
Lim, Si Xian
Teo, Alistair Guo Hao
Ong, Kian-Soo
Chong, Karen Siew Ling
Duan, Fei
format Article
author Lim, Si Xian
Teo, Alistair Guo Hao
Ong, Kian-Soo
Chong, Karen Siew Ling
Duan, Fei
author_sort Lim, Si Xian
title Wetting geometry and deposition patterns manipulation with bi-dispersed particle-laden droplets
title_short Wetting geometry and deposition patterns manipulation with bi-dispersed particle-laden droplets
title_full Wetting geometry and deposition patterns manipulation with bi-dispersed particle-laden droplets
title_fullStr Wetting geometry and deposition patterns manipulation with bi-dispersed particle-laden droplets
title_full_unstemmed Wetting geometry and deposition patterns manipulation with bi-dispersed particle-laden droplets
title_sort wetting geometry and deposition patterns manipulation with bi-dispersed particle-laden droplets
publishDate 2024
url https://hdl.handle.net/10356/179149
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