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Colloids03:22

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Children at play often make suspensions such as mixtures of mud and water, flour and water, or a suspension of solid pigments in water known as tempera paint. These suspensions are heterogeneous mixtures composed of relatively large particles that are visible to the naked eye or can be seen with a magnifying glass. They are cloudy, and the suspended particles settle out after mixing. On the other hand, a solution is a homogeneous mixture in which no settling occurs and in which the dissolved...
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The high insolubility of some precipitates can result in an unfavorable relative supersaturation. This can lead to colloidal particles with a large surface-to-mass ratio, where adsorption is promoted. For instance, in the precipitation of silver chloride, silver ions are adsorbed on the surface of the colloidal particles, forming a primary layer. This layer attracts ions of opposite charge (such as nitrate ions), forming a diffuse secondary layer of adsorbed ions. This electric double layer...
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In precipitation gravimetry, the precipitating agent should react specifically or selectively with the analyte. While a specific reagent reacts with the analyte alone, a selective reagent can react with a limited number of chemical species.
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Colloidal deposits from evaporating sessile droplets: A computationally efficient framework for predicting the final

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This study presents a new model for evaporating particle-laden droplets, incorporating particle jamming for accurate deposit prediction. The model simplifies simulations, enabling direct comparison with experimental results on deposit topography.

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Area of Science:

  • Fluid dynamics
  • Materials science
  • Surface science

Background:

  • Evaporation of particle-laden droplets is crucial in various applications.
  • Previous models often struggle with accurately predicting deposit dimensions due to complex phenomena like particle jamming.
  • Understanding droplet evaporation dynamics is key to controlling deposit morphology.

Purpose of the Study:

  • To develop a comprehensive modeling framework for the complete evaporation of particle-laden droplets.
  • To incorporate particle jamming as a critical transition from fluid advection to a porous plug.
  • To enable realistic predictions of deposit dimensions and topography, facilitating comparison with experimental data.

Main Methods:

  • A novel modeling framework was developed to simulate droplet evaporation, including touchdown events.
  • Particle jamming was integrated into the model, transitioning from free advection to an immobile porous plug.
  • The simulation approach avoids explicit tracking of jammed particle fronts, allowing for complete jamming simulation.

Main Results:

  • The model successfully predicts deposit dimensions by accounting for particle jamming.
  • Simulations allow for direct and valid comparisons with experimental findings on dried deposit topography.
  • The framework's applicability to general contact line geometries was demonstrated.

Conclusions:

  • The developed modeling framework provides a robust tool for studying particle-laden droplet evaporation.
  • Incorporating particle jamming is essential for accurate prediction of deposit morphology.
  • The model's flexibility allows for the investigation of contact line geometry effects on deposit profiles.