Drying-induced stresses before solidification in colloidal dispersions: <i>in situ</i> measurements

Bouchaudy, Anne; Salmon, Jean‐Baptiste

doi:10.1039/c8sm02558d

Cited by 17 publications

(40 citation statements)

References 52 publications

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“…The images of Figure 6 show an increase of the volume fraction of colloids with time consistent with a drying kinetics. The image at the last instant shows the heterogeneous material obtained at the end of a confined drying, as we can observe water pockets in the centre of the drop surrounding the hole that has formed during drying (likely due to a trapped air bubble or by the mechanical constraints highlighted by the authors in [12]). By representing the colloid volume fraction along a radius of the drop for several instants, we can highlight the concentration gradients extending from the centre to the edge of the drop.…”

Section: Calibration Proceduresmentioning

confidence: 93%

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Thermospectroscopic infrared imaging of a confined drying process

Lehtihet

Abisset

Chevalier

et al. 2021

Chemical Engineering Journal

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We present an infrared (IR) imaging technique that allows us to retrieve quantitative concentration and thermal maps with relatively fast acquisition times for samples that are evolving in time and have micron-scale spatial resolution. As a proof-of-concept, we image the transient drying kinetics of a µL drop of colloidal suspension in a confined geometry. Quantitative concentration maps inside the drying droplet are retrieved. Transport phenomena such as colloid redistribution inside the droplet due to inhomogeneous drying can be highlighted by this means. A numerical inverse method based on the acquired images that allows one to estimate intrinsic properties of the studied material, such as the collective diffusion coefficient of the mixture, is presented. Such a technique combined with statistical inverse methods provides a useful, non-invasive means of visualizing and estimating parameters of materials evolving in time.

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Section: Calibration Proceduresmentioning

confidence: 93%

“…Here, the collective diffusion coefficient first decreases as the average concentration increases followed by a trend change around a value of ϕ ≈ 0.32. It could be due to a sol/gel transition that the charged silica particles undergo around this concentration [12].…”

Section: Estimation From Boundary Conditionmentioning

confidence: 99%

Thermospectroscopic infrared imaging of a confined drying process

Lehtihet

Abisset

Chevalier

et al. 2021

Chemical Engineering Journal

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“…Other than sessile or pendant droplets, OCT can characterize levitated droplets to monitor different types of flows or particle motions. 1D confined droplet [66] or 1D confined flows in microfluidic channels can be imaged by OCT to characterize particles' dynamics. For latex coats, it is possible to explore the effects of additives (such as surfactant and water-soluble polymers) on the drying process of latex coats with the established integrated OCT system.…”

Section: Conclusion and Future Perspectivesmentioning

confidence: 99%

Nondestructive Characterization of Drying Processes of Colloidal Droplets and Latex Coats Using Optical Coherence Tomography

Huang¹,

Huang²,

Jiang³

et al. 2020

Optical Coherence Tomography and Its Non-Medical Applications

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In this chapter, we review the applications of optical coherence tomography (OCT) on the nondestructive characterization of the drying processes of colloidal droplets and latex coatings. Employing time-lapse, high-speed imaging, OCT can be used to monitor the dynamic process of drying colloidal droplets. With the aid of high-scattering, micron-sized tracer particles, fluid flows have been captured; phase boundaries are also visible in liquid crystal droplets; and the speckle contrast analysis differentiates the dynamics of particles, showing the packing process and the coffee ring phenomenon. In a waterborne latex coat, time-lapse OCT imaging reveals spatial changes of microstructures, i.e., detachment of latex, cracks, and shear bands; with speckle contrast analysis, 1D and 2D particles' packing process that is initiated from latex/air interface can also be monitored over time. OCT can serve as an experimental platform for fundamental studies of drying colloidal systems. In the future, OCT can also be employed as an in-line quality control tool of polymer coatings and paints for industrial applications.

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“…However, we discovered fairly recently that there are cases where the solid significantly deforms the template during its growth [24]. It is likely due to a poro-elastic mechanism related to the depression generated inside the material, originating from the suction mechanism during the evaporation-induced growth [25].…”

Section: Microfluidic Pervaporationmentioning

confidence: 99%

Thin Coatings of Cerium Oxide Nanoparticles with Anti-Reflective Properties

Romasanta

d’Alencon

Kirchner³

et al. 2019

Applied Sciences

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Cerium oxide, in addition to its catalytic properties, is also known for its optical properties such as ultraviolet (UV) radiation filtering and a relatively high refractive index (n > 2), which makes it an excellent candidate for multifunctional coatings. Here, we focus on the optical properties of thin deposits ( 2 µm) of densely packed CeO 2 nanoparticles, which we assemble using two evaporation-based techniques: convective self-assembly (CSA, a type of very slow blade-coating) to fabricate large-scale coatings of controllable thickness-from tens of nanometres to a few micrometers-and microfluidic pervaporation which permits us to add some micro-structure to the coatings. Spectroscopic ellipsometry yields the refractive index of the resulting nano-porous coatings, which behave as lossy dielectrics in the UV-visible regime and loss-less dielectrics in the visible to infra-red (IR) regime; in this regime, the fairly high refractive index (≈1.8) permits us to evidence thickness-tunable anti-reflection on highly refractive substrates, such as silicon, and concomitant enhanced transmissions which we checked in the mid-IR region.

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Drying-induced stresses before solidification in colloidal dispersions: in situ measurements

Abstract: We report an original setup that enables continuous measurements of stresses induced by the drying of confined drops of complex fluids.

Cited by 17 publications

References 52 publications

Thermospectroscopic infrared imaging of a confined drying process

Thermospectroscopic infrared imaging of a confined drying process

Nondestructive Characterization of Drying Processes of Colloidal Droplets and Latex Coats Using Optical Coherence Tomography

Thin Coatings of Cerium Oxide Nanoparticles with Anti-Reflective Properties

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