Three scenarios of evaporation of microliter droplets of dispersions and structure of formed ring-shaped deposits

Molchanov, S. P.; Roldughin, V. I.; Chernova-Kharaeva, I. A.

doi:10.1134/s1061933x15060162

Cited by 12 publications

(2 citation statements)

References 17 publications

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“…To investigate the process of deposits formation from kerosene-or water-based magnetic fluids, these were applied on glass substrates and dried in an isolated environment. When the drops of both samples were dried on a solid substrate, ring structures were formed on the perimeter of the drops (Figure 2a,b) similar to those studied earlier [28][29][30][31][32][33]. Profile and relative thicknesses of the drops were investigated by photometry and are presented in Figure 2c,d.…”

Section: Resultssupporting

confidence: 62%

The Influence of Electric and Magnetic Fields on the Structure of Flat Drops of Magnetic Fluids upon Drying

2023

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Drop casting is a widely used approach for surface modification and the creation of functional coatings. Drying of sessile droplets is often associated with a so-called coffee-ring effect which originates from a non-uniform evaporation rate in the liquid–air and results in the formation of non-planar deposits. In the last two decades, this phenomenon attracted a lot of attention as a potential approach towards surface modification and structuring, resulting in an increased interest to control the morphology of the formed deposits. Here, we describe the effect of magnetic and electric fields individually and in combination on the processes of deposit formation for drops of water- or kerosene-based magnetic fluids. For the water-based fluid, the relative inner deposit density showed a linear dependence on the applied electric potential in the range from −5 to +5 V and varied from 100% to 31%, while kerosene-based fluid did not respond to the electric field. The combination of electric and magnetic fields allowed more complex control over the morphology of the deposits and to separate the annular deposit from the main one by the rim up to 0.3 mm. The theoretical basis behind the observed effects is discussed.

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Section: Resultssupporting

confidence: 62%

The Influence of Electric and Magnetic Fields on the Structure of Flat Drops of Magnetic Fluids upon Drying

2023

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“…Particle transport in evaporating droplets can also be affected by the particles themselves. Prior studies have varied the particle shape, , type, charge, size, and concentration , and all can play a role in transport and deposition. For example, the particle shape can be used to affect particle transport and deposition by altering how particles arrange themselves on the air–water interface during evaporation; , particle transport can be affected by surface and particle charges that lead to Derjaguin, Landau, Verwey, and Overbeek effects that combine van der Waals’ and electrostatic forces between particles and surfaces; , and particles that are more dense than the liquid they are suspended in are likely to sink to the substrate before being carried to the contact line by advection. ,, The present study focuses on particle concentration and size.…”

Section: Introductionmentioning

confidence: 99%

Characterization of Particle Transport and Deposition Due to Heterogeneous Dewetting on Low-Cost Inkjet-Printed Devices

Li,

Maki,

Schertzer

2023

Langmuir

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This work investigates the deposition patterns left by evaporating particle-laden droplets on heterogeneous surfaces with spatially varying wettability. Spatial differences in receding contact angles give rise to scalloped-shaped contact lines. During evaporation, the contact line recedes in one location and remains pinned in another. This nonuniform contact line recession results in particle self-assembly above areas where the contact line remains pinned but not where it recedes. This behavior is fairly robust across a variety of particle sizes, concentrations, and device geometries. We hypothesize that particle self-assembly in these cases is due to the competition between particle diffusion and evaporative-driven advective flow. Diffusion appears to be more pronounced in regions where the contact line recedes, while advection appears to be more pronounced near the pinned portion of the contact line. As such, particles appear to diffuse away from receding areas and toward pinned areas, where advection transports them to the contact line. The distribution of particle deposition above the pinned regions was influenced by the particle size and the concentration of particles in the droplet. Similar to homogeneous surfaces, deposition was more prevalent at the pinned portion of the contact line for smaller particles and lower concentrations and more uniformly distributed across the entire pinned region for larger particles and higher concentrations. A better understanding of this process may be beneficial in a wide variety of particle separation applications, such as printing, cell patterning, biosensing, and anti-icing.

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Dependence of the structure of ring-shaped deposits resulting from evaporation of dispersion droplets on initial contact angle

et al. 2016

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Three scenarios of evaporation of microliter droplets of dispersions and structure of formed ring-shaped deposits

Cited by 12 publications

References 17 publications

The Influence of Electric and Magnetic Fields on the Structure of Flat Drops of Magnetic Fluids upon Drying

The Influence of Electric and Magnetic Fields on the Structure of Flat Drops of Magnetic Fluids upon Drying

Characterization of Particle Transport and Deposition Due to Heterogeneous Dewetting on Low-Cost Inkjet-Printed Devices

Dependence of the structure of ring-shaped deposits resulting from evaporation of dispersion droplets on initial contact angle

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