Role of particle shape anisotropy on crack formation in drying of colloidal suspension

Dugyala, Venkateshwar Rao; Lama, Hisay; Satapathy, Dillip K.

doi:10.1038/srep30708

Cited by 51 publications

(51 citation statements)

References 34 publications

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“…A 2D model of the vertical drying of a colloidal film containing rod-like particles (k-mers, k ∈ [1,12]) was studied by means of kinetic Monte Carlo simulation. The initial state before drying was produced by using an algorithm of random sequential adsorption (RSA) with isotropic orientations of the k-mers.…”

Section: Discussionmentioning

confidence: 99%

“…In the RSA model, overlapping with previously placed k-mers is strictly forbidden. The problem was treated on a two-dimensional square lattice of size L x × L y and the rods were represented as linear k-mers (i.e., particles occupying k adjacent sites) with a length of k ∈ [2,12]. The periodic boundary conditions were applied along the horizontal x axis.…”

Section: Computational Modelmentioning

confidence: 99%

“…Particle shape anisotropy plays an important role in the drying of a colloidal suspension [12]. The phenomenon of EDSA and the ordering of anisotropic particles have been experimentally investigated [13].…”

Section: Introductionmentioning

confidence: 99%

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Monte Carlo simulation of evaporation-driven self-assembly in suspensions of colloidal rods

et al. 2016

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The vertical drying of a colloidal film containing rodlike particles was studied by means of kinetic Monte Carlo (MC) simulation. The problem was approached using a two-dimensional square lattice, and the rods were represented as linear k-mers (i.e., particles occupying k adjacent sites). The initial state before drying was produced using a model of random sequential adsorption (RSA) with isotropic orientations of the k-mers (orientation of the k-mers along horizontal x and vertical y directions are equiprobable). In the RSA model, overlapping of the k-mers is forbidden. During the evaporation, an upper interface falls with a linear velocity of u in the vertical direction and the k-mers undergo translation Brownian motion. The MC simulations were run at different initial concentrations, p_{i}, (p_{i}∈[0,p_{j}], where p_{j} is the jamming concentration), lengths of k-mers (k∈[1,12]), and solvent evaporation rates, u. For completely dried films, the spatial distributions of k-mers and their electrical conductivities in both x and y directions were examined. Significant evaporation-driven self-assembly and orientation stratification of the k-mers oriented along the x and y directions were observed. The extent of stratification increased with increasing value of k. The anisotropy of the electrical conductivity of the film can be finely regulated by changes in the values of p_{i}, k, and u.

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Section: Discussionmentioning

confidence: 99%

Section: Computational Modelmentioning

confidence: 99%

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Monte Carlo simulation of evaporation-driven self-assembly in suspensions of colloidal rods

et al. 2016

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“…A SEM image of the cracks at d = 0.1 μm, c = 0.1 %(Figure 4(a)) shows a dense packing of the particles at the two interfaces of the crack. As pointed to in Refs [18,35,44,45],. a growing ring exhibits a gel-like behavior with a dense packing of the particles.…”

mentioning

confidence: 90%

“…Kim et al [34] studied the crack formation mechanism on drying of a colloidal droplet of PMMA particles and observed that the crack initiation mechanism is favorable 6 in small colloids (0.1 μm diameter) than that to the large colloids (1 μm diameter) due to air invasion inside the ring in the large colloids case. Dugyala et al [35] reported on the effect of particles shape on the cracks formed in the ring and observed radial and concentric crack patterns for spherical and ellipsoidal particles, respectively. Lama et al [18] studied crack formation in the ring using silica nanoparticles and polystyrene particles (0.1 μm diameter) of different concentration of [0.1-2.0] % wt and observed larger crack density and ordered cracks on the ring at a larger substrate temperature due to lesser ring height.…”

Section: Introductionmentioning

confidence: 99%

Analysis of profile and morphology of colloidal deposits obtained from evaporating sessile droplets

Malla

Bhardwaj

Neild

2019

Colloids and Surfaces A: Physicochemical and Engineering Aspect

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We experimentally investigate the profile and morphology of the ring-like deposits obtained after evaporation of a sessile water droplet containing polystyrene colloidal particles on a hydrophilic glass substrate. In particular, the coupled effect of particle size and concentration are studied. The deposits were qualitatively visualized under an optical microscope and profile of the ring was measured by an optical profilometer. The profile of the ring resembles a partial torus-like shape for all cases of particles size and concentration. The cracks on the surface of the ring were found to occur only at smaller particle size and larger concentration. We plot a regime map to classify three deposit types -discontinuous monolayer ring, continuous monolayer ring, and multiple layers ring -on particles concentration -particle size plane. Our data shows a possible existence of a critical concentration (particle size) for a given particle size (concentration) at which the monolayer ring forms. For the larger particle sizes, the immersion capillary forces between the particles dominate, aiding the formation of a monolayer ring of the particles. The relative mass of the particles accumulated in the ring is lesser in cases of the monolayer ring. We measure the width and height of the ring and show that they scale with particle concentration by a power law for the multiple layers ring. This scaling corroborates with an existing continuum based theoretical model.We briefly discuss the effect of the interaction of growing deposit with shrinking free surface on the ring dimensions and profile. The present results aid understanding of the ring formation process and will be useful in guiding the design of self-assemblies of the colloidal particles formed by the evaporating droplets.

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Stimuli‐Responsive, Shape‐Transforming Nanostructured Particles

Lee

Kim

et al. 2017

Advanced Materials

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Development of particles that change shape in response to external stimuli has been a long-thought goal for producing bioinspired, smart materials. Herein, the temperature-driven transformation of the shape and morphology of polymer particles composed of polystyrene-b-poly(4-vinylpyridine) (PS-b-P4VP) block copolymers (BCPs) and temperature-responsive poly(N-isopropylacrylamide) (PNIPAM) surfactants is reported. PNIPAM acts as a temperature-responsive surfactant with two important roles. First, PNIPAM stabilizes oil-in-water droplets as a P4VP-selective surfactant, creating a nearly neutral interface between the PS and P4VP domains together with cetyltrimethylammonium bromide, a PS-selective surfactant, to form anisotropic PS-b-P4VP particles (i.e., convex lenses and ellipsoids). More importantly, the temperature-directed positioning of PNIPAM depending on its solubility determines the overall particle shape. Ellipsoidal particles are produced above the critical temperature, whereas convex lens-shaped particles are obtained below the critical temperature. Interestingly, given that the temperature at which particle shape change occurs depends solely on the lower critical solution temperature (LCST) of the polymer surfactants, facile tuning of the transition temperature is realized by employing other PNIPAM derivatives with different LCSTs. Furthermore, reversible transformations between different shapes of PS-b-P4VP particles are successfully demonstrated using a solvent-adsorption annealing with chloroform, suggesting great promise of these particles for sensing, smart coating, and drug delivery applications.

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Role of particle shape anisotropy on crack formation in drying of colloidal suspension

Cited by 51 publications

References 34 publications

Monte Carlo simulation of evaporation-driven self-assembly in suspensions of colloidal rods

Monte Carlo simulation of evaporation-driven self-assembly in suspensions of colloidal rods

Analysis of profile and morphology of colloidal deposits obtained from evaporating sessile droplets

Stimuli‐Responsive, Shape‐Transforming Nanostructured Particles

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