Micrometer-sized particles in a two-dimensional self-assembly during drying of liquid film

Lallet, François; Olivi-Tran, Nathalie

doi:10.1103/physreve.74.061401

Cited by 8 publications

(13 citation statements)

References 22 publications

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“…Particles that are not located in the channel but on the flat part (smooth or rough) of the substrate are subjected to lateral capillary forces (forces between two particles). These forces are attractive and are written as follows [7,8,17]:…”

Section: Horizontal Forcesmentioning

confidence: 99%

“…Figure 5 shows a schematic description of these parameters. The analytical expressions of r c and φ c are written as follows [7,8,17]:…”

Section: Horizontal Forcesmentioning

confidence: 99%

“…The size of the colloidal spherical particles was chosen to be 1 µm. This size is intermediate between nanoscale physics and micrometer scale physics.This topography was only studied once (see reference [7]) but with a suspension of faceted particles with a size of 10 µm. Moreover, in [7], the numerical modeling did not take into account all the forces used in this present study.…”

Section: Introductionmentioning

confidence: 99%

“…This size is intermediate between nanoscale physics and micrometer scale physics.This topography was only studied once (see reference [7]) but with a suspension of faceted particles with a size of 10 µm. Moreover, in [7], the numerical modeling did not take into account all the forces used in this present study. Indeed, several forces act between the particles and the substrate and between the particles themselves: the first of these are the forces resulting from microfluidics: capillary forces [7,8], Brownian forces and Stokes forces [9]; the second are the DLVO forces: van der Waals forces [3] and electrostatic double layer forces [10]; the third are the optical forces [11] which result from the irradiance of the light bulb of the microscope; the fourth are the friction forces, which differ depending on where the particles are located-in the rough areas of the substrate or in the smooth areas of the substrate-and the fifth force is the weight of the particles.…”

Section: Introductionmentioning

confidence: 99%

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Drying of a Colloidal Suspension Deposited on a Substrate: Experimental and Numerical Studies

2021

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We studied a colloidal suspension of polystyrene beads deposited on a glass substrate. The glass substrate contained either straight rough areas on the borders of an open channel or only straight rough areas. The drying of the suspension was observed with an optical microscope, the light bulb of which acted as an energy source to evaporate the suspension. Moreover, the light bulb of the microscope provided optical pressure due to light. We observed that the colloidal particles were trapped on the rough areas of the substrate and not in the open channel at the end of the drying process. In order to understand the experimental results, we modeled numerically the drying of the suspension using a Molecular Dynamics program. The forces imposed on the substrate by the particles are their weight, the optical pressure due to the light bulb of the optical microscope, the attractive Van der Waals force and the repulsive diffuse layer force. The forces acting between two particles are the attractive Van der Waals forces, the repulsive diffuse layer force and the capillary force. The Gaussian random force (linked to Brownian motion) and the particle liquid viscous drag force (also linked to Brownian motion) are horizontal and applied on one particle. The relation between the normal forces N (forces acting by the particles on the substrate) and the horizontal forces F is Amontons' third law of friction F ≤ μk N; in rough areas of the substrate, μk is larger than in smooth areas. This explains that particles are trapped in the areas with high roughness.

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Section: Horizontal Forcesmentioning

confidence: 99%

“…Figure 5 shows a schematic description of these parameters. The analytical expressions of r c and φ c are written as follows [7,8,17]:…”

Section: Horizontal Forcesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Drying of a Colloidal Suspension Deposited on a Substrate: Experimental and Numerical Studies

2021

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“…If the particles have enough time to pack, i.e. low evaporation rate of water, a dense packing could be obtained [9]. However, since the surface electrostatic charges of the polymer particles modify the interaction among them, this might affect the packing of the polymer particles.…”

Section: Introductionmentioning

confidence: 99%

Effect of the acrylic acid content on the permeability and water uptake of poly(styrene-co-butyl acrylate) latex films

et al. 2008

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Acrylic acid (AA) is a monomer commonly employed in emulsion polymerization to provide electrostatic colloidal stability and improve specific film performance. The addition of AA not only modifies the kinetics of the polymerization, but also it takes part in the interaction between colloidal particles, which has a strong influence on their packing and consequent latex film properties. In this contribution a theoretical modeling of the latex film formation is presented and compared to experimental results: water vapor permeability and latex film capacitance are studied as a function of AA content. It has been shown that water uptake is mainly affected by film morphology which in turn is defined by intercolloidal interaction and drying rate.

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Geometric Model Describing the Banded Morphology of Particle Films Formed by Convective Assembly

et al. 2009

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Nanoparticle films coated on smooth substrates by convective assembly from dilute suspensions in dip-coating configuration are known to have discrete film morphologies. Specifically, the film morphology is characterized by alternating bands of densely packed particles and bands of bare substrate. Convective assembly is a frontal film-growth process that occurs at the three-phase contact line formed by the substrate, the suspension in which it is submersed, and the surrounding air. The bands are parallel to this contact line and can be either monolayered or multilayered. Monolayered bands result whenever the substrate is withdrawn from the suspension at a rate too high for particles to assemble into a continuous film. We report a new insight to the mechanism behind this banding phenomenon, namely, that inter-band spacing is strongly influenced by the constituent particle size. We therefore propose a geometric model relating the inter-band spacing to the particle size. By making banded films with systematically varied particle sizes (silica/zeolite, 20 to 500 nm), we are able to quantitatively validate our model. Furthermore, the model correctly predicts that multilayered banded films have higher inter-band spacings than monolayered banded films comprising the same particles.

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Micrometer-sized particles in a two-dimensional self-assembly during drying of liquid film

Cited by 8 publications

References 22 publications

Drying of a Colloidal Suspension Deposited on a Substrate: Experimental and Numerical Studies

Drying of a Colloidal Suspension Deposited on a Substrate: Experimental and Numerical Studies

Effect of the acrylic acid content on the permeability and water uptake of poly(styrene-co-butyl acrylate) latex films

Geometric Model Describing the Banded Morphology of Particle Films Formed by Convective Assembly

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