Controlling Spatial Morphology of Microparticle Deposits via Thermocapillary Flows: Effect of Boundary Geometry

被引:0
作者
Ivanova, Natalia A. [1 ,2 ,3 ]
Al-Muzaiqer, Mohammed [1 ,2 ,3 ]
Fliagin, Viktor M. [1 ,3 ]
机构
[1] Univ Tyumen, X BIO Inst, Photon & Microfluid Lab, Tyumen 625003, Russia
[2] Astrakhan State Univ, Math Modeling Lab, Astrakhan 414056, Russia
[3] Univ Tyumen, Microfiltrat Proc Lab, Tyumen 625003, Russia
基金
俄罗斯科学基金会;
关键词
MENISCUS SHAPE; COFFEE RINGS; DEFORMATION; MODULATION; DROPLETS;
D O I
10.1021/acs.langmuir.4c00888
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
The production of particle deposits with a desired distribution geometry has significant potential for materials science, printing, and coating technologies. Most methods for achieving well-defined assemblies rely on the spontaneous evaporation of colloidal solutions on substrates with predetermined properties, or on precise control of particle arrangement by external stimuli. Here, we present a combined method that enables the production of centimeter-scale microparticle deposits with a desired geometric shape. The method is based on controlling the massive transport of microparticles by thermocapillary flow in a layer of volatile liquid in a cell with borders of the desired geometry. Capillary forces cause the liquid to be distributed in the cell, forming corner wetting menisci and the flat layer in the central area. The formation of particle deposits occurs in two stages, determined by the flow regime. At the initial stage, the axisymmetric thermocapillary flow occurs in the flat part of the layer, resulting in the circular shape of the particle deposit. During the transition to the second stage of assembling thermocapillary flow is localized in the corner wetting menisci that results in reshaping the current particle deposit to match the geometry of the cell borders. Here, we demonstrated the creation of circular, square, and triangular shapes of the patterns of polystyrene microparticles using a point heater located at the geometric center of the cell. The proposed method is reliable, easy to implement, and potentially capable of producing a wide variety of deposit geometries, making it an attractive technique for patterning and modifying surface properties with particles of any type.
引用
收藏
页码:13486 / 13495
页数:10
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