Surface patterns in drying films of silica colloidal dispersions

Boulogne, François; Giorgiutti-Dauphiné, F.; Pauchard, Ludovic

doi:10.1039/c4sm02106a

Cited by 15 publications

(25 citation statements)

References 37 publications

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“…Moreover, in drying dispersions containing particles of very different sizes, a distinct layering, or stratification, can occur resulting in an inhomogeneous distribution of the different particle species across the final film. [49][50][51][52] Because of the directional release of stresses around the growing cracks, fracture networks typically display distinct statistical features, such as polygonal cracks in dried silica suspensions and mud 53,54 or regularly spaced radial cracks in dried colloidal droplets. Upon drying, the concentration of these solutes increases; as a result, the interactions between each of these species evolve in time, as well as the interactions between the solid or liquid particles mediated by the presence of polymers and surfactants, which in turn affects the phase behaviour and dynamics of the system.…”

Section: Joris Sprakelmentioning

confidence: 99%

“…No clear understanding exists so far to what extent this will affect the structure and properties of the final film; for example, in some cases films are known to exhibit a heterogeneous distribution of inorganic pigment particles. 39,51,61,62 Furthermore, a variety of strategies have been proposed to prevent cracking, such as reducing the interparticle adhesion, 45,57 increasing the elastic modulus of the particle network, 53,63 and mitigating stress buildup by adding soft colloids. Water flow during drying can also transport dissolved species to the dry end of the paint layer, potentially leading to accumulation of solutes at the paint-air boundary, depending on the relative rates of water flux and thermal diffusion of the solutes.…”

Section: Joris Sprakelmentioning

confidence: 99%

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Watching paint dry; more exciting than it seems

Kooij

Sprakel

2015

Soft Matter

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With an ever-increasing demand for sustainable alternatives to solvent-borne coatings and paints, the pressure to develop aqueous alternatives that match or exceed the performance of their traditional counterparts rises. A crucial step in this sustainability challenge for the years to come is to arrive at a deep, and complete, understanding of how aqueous paints dry and form their final protective films. As it turns out, this is no minor challenge. Yet, understanding drying and film formation is a prototypical soft matter problem at heart, displaying a rich variety of complex non-equilibrium phenomena that are waiting to be understood. Watching paint dry is far from the boring activity the saying suggests.

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Section: Joris Sprakelmentioning

confidence: 99%

Section: Joris Sprakelmentioning

confidence: 99%

Watching paint dry; more exciting than it seems

Kooij

Sprakel

2015

Soft Matter

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“…Often, these papers focus on the genesis and physics of an individual crack, e.g., Thouless et al (1987); Hutchinson and Suo (1991). However, there are also approaches to whole crack patterns, see e.g., Xia and Hutchinson (2000); Iben and O'Brien (2006); Hafver et al (2014); Boulogne et al (2015); Seghir and Arscott (2015); Nandakishore and Goehring (2016); Kumar et al (2017). Furthermore, also networks of roads are modeled as tessellations, see e.g., Yu et al (2014).…”

Section: Introductionmentioning

confidence: 99%

Modeling Crack Patterns by Modified STIT Tessellations

et al. 2020

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Random planar tessellations are presented which are generated by subsequent division of their polygonal cells. The purpose is to develop parametric models for crack patterns appearing at length scales which can change by orders of magnitude in areas such as nanotechnology, materials science, soft matter, and geology. Using the STIT tessellation as a reference model and comparing with phenomena in real crack patterns, three modifications of STIT are suggested. For all these models a simulation tool, which also yields several statistics for the tessellation cells, is provided on the web. The software is freely available via a link given in the bibliography of this article. The present paper contains results of a simulation study indicating some essential features of the models. Finally, an example of a real fracture pattern is considered which is obtained using the deposition of a thin metallic film onto an elastomer material – the results of this are compared to the predictions of the model.

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“…The solid line is a guide for the eye.of the colloidal suspension, the particles concentrate and form a porous material for which the surface remains wet. The liquid flow driven by the evaporation generates a pressure gradient due to the Darcy law, which is responsible for a tensile stress in the deposit [37,38]. When the compression exceeds the repulsive interactions between the colloids, silica particles irreversibly aggregate [30] and the menisci penetrate in the material [39].…”

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confidence: 99%

Effect of the Polydispersity of a Colloidal Drop on Drying Induced Stress as Measured by the Buckling of a Floating Sheet

et al. 2016

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We study the stress developed during the drying of a colloidal drop of silica nanoparticles. In particular, we use the wrinkling instability of a thin floating sheet to measure the net stress applied by the deposit on the substrate and we focus on the effect of the particle polydispersity. In the case of a bidisperse suspension, we show that a small number of large particles substantially decreases the expected stress, which we interpret as the formation of lower hydrodynamic resistance paths in the porous material. As colloidal suspensions are usually polydisperse, we show for different average particle sizes that the stress is effectively dominated by the larger particles of the distribution and not by the average particle size. PACS numbers:Drying of colloidal droplets is ubiquitous in processes such as ink-jet printing technologies [1] or spray painting. Recently, new directions for printing techniques have been developed for soft materials to enable applications such as conformable electronics, soft robotics and wearable devices. For instance, electronic circuits can be printed on elastomers [2,3] and human skin [4]. However, deformations of the surface can be induced by the surface tension of a liquid drop [5][6][7] or the consolidation of a colloidal material [8], which could affect the final quality and the function of the printed device. Here, we report measurements of the drying induced stress and highlight the role of polydispersity of the suspension.Previous reported measurements of drying or cracking stresses rely on the deflection of a cantilever beam [9][10][11][12] where a liquid film of a polymer solution or colloidal suspension is coated on a thin flexible plate. In such a geometry, the film dries from the edge toward the center of the film [13], which leads to spatially inhomogeneous states of the material.However, besides the bending, when a stress is applied above a certain limit to a thin sheet, a wrinkling instability can be observed [14][15][16][17]. Recent studies focused on an elastomeric disk floating on a liquid bath with a liquid drop in the center of the disk [1,18,[20][21][22]. In these situations, the stress applied to the membrane is due to the surface tension of the involved liquids. Therefore, these studies of a deformable sheet established models based on Föppl-von Kàrmàn equations to predict the length and the number of wrinkles.In this Letter, we focus on visualizing and measuring the stress induced by the drying of a colloidal drop on a floating membrane (Fig. 1). The mechanical properties of the membrane are chosen carefully to satisfy two conditions. First, the surface tension of the pure liquid drop alone and its weight do not trigger the wrinkling instability ( Fig. 1(a)). Second, the drying-induced consolidation of the colloidal droplet, which induces a larger tensile stress in the membrane, triggers the instability ( Fig. 1(b)). From the length of the wrinkles, we can deduce the tension in the film. Our aim is to examine the effect of particle size and polydispersity ...

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Surface patterns in drying films of silica colloidal dispersions

Cited by 15 publications

References 37 publications

Watching paint dry; more exciting than it seems

Watching paint dry; more exciting than it seems

Modeling Crack Patterns by Modified STIT Tessellations

Effect of the Polydispersity of a Colloidal Drop on Drying Induced Stress as Measured by the Buckling of a Floating Sheet

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