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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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The formation of a colloidal system is exemplified by an aqueous solution containing Cl− ions is introduced to another containing Ag+ ions, resulting in the precipitation of solid AgCl as extremely tiny crystals. Instead of settling out as a filterable precipitate, these crystals remain suspended in the liquid, showcasing a colloidal system.A colloidal system involves colloidal particles within the approximate range of 1 to 1000 nm in at least one dimension, dispersed in a medium called...
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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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Particles with selective wetting affect spinodal decomposition microstructures.

Supriyo Ghosh1, Arnab Mukherjee, T A Abinandanan

  • 1Materials Engineering Department, Indian Institute of Science, Bangalore 560012, India.

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Summary
This summary is machine-generated.

Immobile particles significantly alter microstructure formation in polymer blends during spinodal decomposition. New effects include changes in bicontinuity and layer evolution around particles, impacting material properties.

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Area of Science:

  • Materials Science
  • Polymer Science
  • Soft Matter Physics

Background:

  • Spinodal decomposition is crucial for microstructure formation in polymer blends.
  • Immobile particles can influence phase separation dynamics and final structures.
  • Understanding these interactions is key for designing materials with specific properties.

Purpose of the Study:

  • To investigate the impact of immobile particles on microstructure evolution during spinodal decomposition in ternary polymer blends.
  • To explore novel effects arising from particle wetting, spinodal decomposition, and coarsening interactions.
  • To analyze the influence of particle presence on bicontinuity and layer formation.

Main Methods:

  • Mesoscale simulations were employed to model the system.
  • The study focused on a regime of interparticle spacings relative to the spinodal length scale.
  • Simulations tracked microstructure evolution over time.

Main Results:

  • In symmetric mixtures, particles prevent bicontinuous microstructures.
  • Asymmetric mixtures initially form non-bicontinuous structures that evolve to bicontinuous ones.
  • Particle wetting leads to alternating layers, but coarsening causes the first layer to disappear, leaving the non-preferred component in contact with the particle.
  • Domain coarsening at late times follows the Lifshitz-Slyozov-Wagner law (R(t) ~ t^(1/3)).

Conclusions:

  • Immobile particles introduce significant deviations from typical spinodal decomposition behavior.
  • The interplay between wetting and coarsening dynamics dictates the final microstructure near particles.
  • These findings provide insights into controlling polymer blend morphology through particle inclusion.