Effect of substrate elasticity on evaporation kinetics and evaporative deposition of aqueous polystyrene nanoparticles d
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vember 2020 Vol. 63 No. 11: 114612 https://doi.org/10.1007/s11433-020-1589-1
Effect of substrate elasticity on evaporation kinetics and evaporative deposition of aqueous polystyrene nanoparticles droplets 1*
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Ying-Song Yu , Yi-Qi Zhu , XianFu Huang , Jin-Zhi Zhou , and An Zhou 1
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Department of Mechanics, School of Civil Engineering, Architecture and Environment, Hubei University of Technology,
Wuhan 430068, China; State Key Laboratory of Nonlinear Mechanics, Institute of Mechanics, Chinese Academy of Sciences, Beijing 100190, China Received February 1, 2020; accepted June 3, 2020; published online September 2, 2020
Evaporation of aqueous polystyrene (PS) nanoparticles droplets on silicon and polydimethylsiloxane (PDMS) surfaces was studied. Experimental results showed that softer PDMS surfaces yielded a longer constant contact radius (CCR) stage, which could be ascribed to surface deformation of PDMS induced by the vertical component of liquid-vapor interfacial tension. Ringlike depositions of nanoparticles with different crack patterns were found on both silicon and PDMS surfaces. In-situ observation of crack formation showed that nanoparticle movement on the silicon surface was impeded, resulting in radial cracks with periodic distribution. In contrast, nanoparticles were shown to move easily on the PDMS surface. This observation indicated the difference in crack patterns on surfaces could be attributed to the friction force between nanoparticles and the substrate. A large friction force between nanoparticles and the substrate prevented cracks from moving, resulting in a radial crack pattern with periodic distribution, while a small friction force produced multiple large cracks. droplet, evaporation, nanoparticle, constant contact radius stage, crack PACS number(s): 61.30.Hn, 61.46.Fg, 68.03.Fg Citation:
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Y.-S. Yu, Y.-Q. Zhu, X. F. Huang, J.-Z. Zhou, and A. Zhou, Effect of substrate elasticity on evaporation kinetics and evaporative deposition of aqueous polystyrene nanoparticles droplets, Sci. China-Phys. Mech. Astron. 63, 114612 (2020), https://doi.org/10.1007/s11433-020-1589-1
Introduction
Evaporation-induced deposition has broad applications in fields such as ink-jet printing, photonic crystal fabrication, functional materials, DNA/RNA mapping, and disease diagnosis [1-8]. Extensive studies have shown particle size and geometry [9-11], physical and chemical properties of the substrate [10,12-14] and liquid [15-18], and environmental conditions [19-21] play important roles in evaporative de*Corresponding authors (Ying-Song Yu, email: [email protected]; Jin-Zhi Zhou, email: [email protected])
position. There are at least two issues limiting the formation of uniform or ordered evaporative deposition. The first is the coffee-ring effect [22], which is widely accepted to be the result of contact line pinning [22] and suppression of Marangoni flow [23]. The second is the formation of cracks. When a liquid containing nanoparticles [24-27] or biological materials including proteins [28,29] and
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