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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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Dissolution kinetics, an essential aspect of oral drug delivery, is significantly influenced by the drug's particle size. According to the Noyes-Whitney dissolution model, the dissolution rate correlates directly with the drug's surface area. The larger the surface area, the higher the drug's solubility in water, leading to a faster drug dissolution rate. Reducing particle size increases the effective surface area, enhancing the dissolution process. Micronization and nanosizing are...
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Solution, Solubility, and Solubility Equilibrium
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Effects of Interfacial Shear on Particle Aggregation at an Oil/Water Interface.

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Particle aggregate microstructure at oil/water interfaces under flow was simulated. Findings reveal shear and capillary forces dictate aggregate behavior, with distinct regimes observed at varying shear rates.

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Area of Science:

  • Colloid and Surface Science
  • Fluid Dynamics
  • Computational Physics

Background:

  • Particle aggregation at fluid interfaces is crucial in various industrial processes.
  • Understanding aggregate microstructure under flow conditions is key to controlling interfacial phenomena.
  • Previous experimental studies identified distinct aggregation regimes but lacked detailed microstructural insights.

Purpose of the Study:

  • To investigate the microstructure of particle aggregates at an oil/water interface under applied Couette flow.
  • To elucidate the mechanisms behind aggregate densification and fragmentation at different shear rates.
  • To compare simulation results with existing experimental observations.

Main Methods:

  • Stokesian dynamics simulations were employed to model particle interactions and aggregate formation.
  • The simulations incorporated both shear and capillary forces acting on particles at the interface.
  • Analysis focused on aggregate microstructure, particle bond dynamics, and fragmentation patterns.

Main Results:

  • Simulations reproduced experimentally observed aggregation regimes, influenced by the balance of shear and capillary forces.
  • Densification at low shear rates was attributed to long-timescale particle reorganization driven by capillary torques, differing from prior theories.
  • Moderate shear rates led to aggregate fragmentation via mobile particle bonds, forming smaller clusters.
  • High shear rates completely inhibited particle aggregation.

Conclusions:

  • The study provides a detailed microstructural explanation for particle aggregate behavior at sheared interfaces.
  • Capillary torques play a significant role in aggregate reorganization over longer timescales.
  • The findings reconcile simulation results with experimental data, offering a more comprehensive understanding of interfacial aggregation dynamics.