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Please use this identifier to cite or link to this item: https://scholars.lib.ntu.edu.tw/handle/123456789/598246
Title: Gravity effect of silica and polystyrene particles on deposition pattern control and particle size distribution on hydrophobic surfaces
Authors: Hu T.-Y
Wang C
Yang K.-C
Chen L.-J.
LI-JEN CHEN 
Keywords: Coffee ring effect;Deposition pattern;Drop;Evaporation;Gravity;Sedimentation;Air;Drops;Hydrophobicity;Ink;Particle size;Particle size analysis;Phase interfaces;Polystyrenes;Silica;Size distribution;Solutions;Surface chemistry;Suspensions (fluids);Velocity;Coffee ring effect;Coffee rings;Deposition patterns;Gravity effects;Particles-size distributions;Polystyrene particle;Ring effect;Sedimentation velocities;Self-pinning;Silica particles;Deposits
Issue Date: 2022
Journal Volume: 106
Start page/Pages: 214-224
Source: Journal of Industrial and Engineering Chemistry
Abstract: 
Ring-like residual deposits are often observed after drying suspension droplets on surfaces. That introduces a crucial defect in practical applications, such as ink-jet printing that requires a uniform deposit. In this study, depositions after drying sessile/pendant droplets with silica/polystyrene particles were examined to identify the effect of gravitational sedimentation of particles on self-pinning and deposition pattern. The suspension droplet with larger polystyrene (or silica) particles would trigger the self-pinning at larger (or smaller) particle concentrations. The deposition pattern of pendant drops with silica particles is hill-like. This is due to the large density difference between silica and water to induce high sedimentation velocity, and the particles would precipitate and aggregate along the air–liquid interface to form a hollow shell deposit. The depositions for suspensions with bi-dispersed particles, the larger silica particles would accumulate at the bottom of the deposit due to the higher sedimentation velocity, in contrast to the well-mixed in the deposits for bi-dispersed polystyrene particles. The sedimentation and capillary flow velocities were calculated and discussed. These new findings reveal that the particle density (gravity effect) can be used to adjust the sedimentation velocity to control the deposition morphology and particle size distribution even to suppress the coffee-ring effect. ? 2021 The Korean Society of Industrial and Engineering Chemistry
URI: https://www.scopus.com/inward/record.uri?eid=2-s2.0-85118889012&doi=10.1016%2fj.jiec.2021.10.030&partnerID=40&md5=786ad58bfef97532e30ea359a986ba64
https://scholars.lib.ntu.edu.tw/handle/123456789/598246
ISSN: 1226086X
DOI: 10.1016/j.jiec.2021.10.030
Appears in Collections:化學工程學系

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臺大位居世界頂尖大學之列,為永久珍藏及向國際展現本校豐碩的研究成果及學術能量,圖書館整合機構典藏(NTUR)與學術庫(AH)不同功能平台,成為臺大學術典藏NTU scholars。期能整合研究能量、促進交流合作、保存學術產出、推廣研究成果。

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