Collapse and cavitation during the drying of water-saturated PDMS sponges with closed porosity

Nguyen, Phu Tuan Anh; Vandamme, Matthieu; Коваленко, А. А.

doi:10.1039/d0sm00932f

Cited by 6 publications

(5 citation statements)

References 25 publications

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“…Such pore opening phenomena during drying have also been observed during drying of other soft porous materials ( Nguyen et al, 2020 ). Such phenomena are investigated theoretically ( Wang and Cai, 2015a , 2015b ), where a constrained hydrogel with central cavity is subject to dehydration.…”

Section: Introductionsupporting

confidence: 56%

Analytical and numerical solutions of pore formation in elastic food materials during dehydration

van der Sman,

Curatolo,

Teresi

2024

Current Research in Food Science

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Section: Introductionsupporting

confidence: 56%

Analytical and numerical solutions of pore formation in elastic food materials during dehydration

van der Sman,

Curatolo,

Teresi

2024

Current Research in Food Science

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“…In the 'high Ca El ' series, the capillary pressure in the droplets is always lower than the storage modulus of the continuous phase in the range of frequencies we explored, leading to a consistently softening tendency. For the 'low Ca El ' series, measurement of droplet size is difficult, as is a risk of collapse of empty pores in the soft matrix upon sectioning the sample for microscope observation, which was also observed by Nguyen et al [37]. As a consequence, it is possible that the real size distribution in the samples diverges from the measured distribution, most notably with more smaller droplets than expected.…”

Section: Comparison To Modelsmentioning

confidence: 91%

Decoupling the rheological responses of a soft solid emulsion with liquid inclusions

Gilbert,

Salonen,

Poulard

2024

J. Phys.: Condens. Matter

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Soft solid emulsions are liquid droplets encapsulated in a soft solid material. Typical of dispersed systems, they can combine properties from both the liquid inclusions and the soft solids. The relative importance of the two phases in the rheological response is captured through the elastocapillary number, which compares capillary forces in the liquid inclusions to the matrix rigidity. We work with solid emulsions formed of poly(ethylene glycol) droplets in a poly(dimethylsiloxane) (PDMS) continuous phase. We create three families of emulsions with varying elastocapillary numbers, and range of inclusion volume fractions from 0 to 0.5. Through oscillatory rheology we probe both the elastic response and the dissipative effects of liquid droplets. In the case of a dominant response from the continuous phase or the drops, the results can be described with Palierne's model. However, for the intermediate elastocapillary series we show that the evolution of the storage and loss moduli decouple with dispersed phase volume fraction. We attribute the increase of loss factor with volume fraction to the high polydispersity in droplet size. We can further modulate the response of the materials by cooling to freeze the droplets. This approach allows us to compare these soft solid emulsions with theories related to solid dispersions.

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“…As the pH was maintained constant for both substrates, it may be confidently concluded that these features are a result of the different DLVO forces at play in both these cases. Cavitation has been observed in drying droplets of colloidal solutions and gels [44,45], and occurs due to variation of osmotic pressure between pores, enclosing shell and surrounding liquid drop. In porous samples as in gel networks like Laponite ® gel, if evaporation from bubbles trapped inside gels walls takes place faster than diffusion of solute from the bubble interface to its interior, a cavity may be created inside the gel drop.…”

Section: Cavitation In Acidic Ph On Hydrophobic Substratementioning

confidence: 99%

Role of pH and substrate on drying patterns of Laponite^® droplet

Haque¹,

Dutta²

2021

Phys. Scr.

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Disc shaped Laponite ® particles in aqueous solution have a net negative charge on the faces and a positive charge along the rim. The charge on the rim of these particles changes to negative around a pH of 12. The pH of the aqueous Laponite ® solution thus determines whether the Laponite ® particles arrange themselves in a repulsive glass phase or form a cage-like gel structure as they gel during drying. When droplets of Laponite ® solution having different pH are allowed to evaporate, the arrangement of the particles during drying is further perturbed by currents of mass transfer due to uneven evaporation flux from the droplet surface. In this work we report the interesting patterns left by drying droplets of aqueous Laponite ® with different pH, dried on substrates of different hydrophobicity. On hydrophobic substrate, in highly acidic pH, a prominent coffee-ring was observed , while in a strong basic pH, salt crystals on Laponite ® particles gathered at the centre of the dried droplet. Similar studies were done on hydrophilic substrates and quite different dried patterns obtained. Further in the case of very acidic pH of the aqueous Laponite ® droplet drying on a hydrophobic substrate, the dried pattern revealed collapsed cavities whose walls showed rings of salt crystallites. We offer an explanation of the different patterns on the basis of particle-substrate electrostatic interactions in tandem with the role of pH, in the determination of the final pattern.

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Collapse and cavitation during the drying of water-saturated PDMS sponges with closed porosity

Abstract: In this paper, we study the drying of water-saturated porous polydimethylsiloxane (PDMS) elastomers with closed porosity in which the evaporation of water is possible only via the diffusion across the...

Cited by 6 publications

References 25 publications

Analytical and numerical solutions of pore formation in elastic food materials during dehydration

Analytical and numerical solutions of pore formation in elastic food materials during dehydration

Decoupling the rheological responses of a soft solid emulsion with liquid inclusions

Role of pH and substrate on drying patterns of Laponite^® droplet

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Collapse and cavitation during the drying of water-saturated PDMS sponges with closed porosity

Abstract: In this paper, we study the drying of water-saturated porous polydimethylsiloxane (PDMS) elastomers with closed porosity in which the evaporation of water is possible only via the diffusion across the...

Cited by 6 publications

References 25 publications

Analytical and numerical solutions of pore formation in elastic food materials during dehydration

Analytical and numerical solutions of pore formation in elastic food materials during dehydration

Decoupling the rheological responses of a soft solid emulsion with liquid inclusions

Role of pH and substrate on drying patterns of Laponite® droplet

Contact Info

Product

Resources

About

Role of pH and substrate on drying patterns of Laponite^® droplet