https://scholars.lib.ntu.edu.tw/handle/123456789/598246
標題: | Gravity effect of silica and polystyrene particles on deposition pattern control and particle size distribution on hydrophobic surfaces | 作者: | Hu T.-Y Wang C Yang K.-C Chen L.-J. LI-JEN CHEN |
關鍵字: | 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 rings;Deposition patterns;Gravity effects;Particles-size distributions;Polystyrene particle;Ring effect;Sedimentation velocities;Self-pinning;Silica particles;Deposits | 公開日期: | 2022 | 卷: | 106 | 起(迄)頁: | 214-224 | 來源出版物: | Journal of Industrial and Engineering Chemistry | 摘要: | 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 |
顯示於: | 化學工程學系 |
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