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Colloidal precipitates01:09

Colloidal precipitates

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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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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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After filtration, the precipitate is washed to remove coprecipitated impurities and any remaining mother liquor. Colloidal precipitates, such as silver chloride, are washed with an electrolyte (such as dilute nitric acid) to prevent the peptization of the precipitate. In the case of slightly soluble precipitates, the wash solution contains a common ion to reduce solubility. Lead sulfate, which is slightly soluble in water, is washed with dilute sulfuric acid. Similarly, wash solutions may be...
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The experimental conditions in a gravimetric analysis should be optimized to maximize the particle size and purity of the obtained precipitate. Ideally, the concentration of the precipitating reagent should be low with effective stirring to maintain low relative supersaturation for the growth of large crystals. In homogeneous precipitation, the precipitant is slowly generated by a chemical reaction in the solution to avoid local reagent excesses. For example, urea decomposes gradually to...
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The introduction of polyesters has brought major development to the textile industry. The wrinkle-free behavior of polyester blends has eliminated the need for starching and ironing clothes.
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Coprecipitation is the contamination of a precipitate by otherwise soluble species and occurs via different processes. In colloidal precipitates, coprecipitation occurs via surface adsorption. For instance, barium sulfate has a primary layer of adsorbed barium ions and a secondary layer of nitrate counterions. This results in contamination of the precipitate by barium nitrate.
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Fabricating High-viscosity Droplets using Microfluidic Capillary Device with Phase-inversion Co-flow Structure
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Compound Droplets on Fibers.

Floriane Weyer1, Marouen Ben Said2, Johannes Hötzer3

  • 1†GRASP, Physics Department, University of Liège, 4000 Liège, Belgium.

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Compound droplets form complex shapes on fibers, with contact line behavior dictating droplet detachment. Triple or quadruple lines influence the characteristic length during this process.

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Area of Science:

  • Fluid dynamics
  • Surface science
  • Materials science

Background:

  • Simple droplet behavior on fibers is well-understood.
  • Compound fluidic systems introduce complexities in droplet formation and behavior.
  • Investigating droplet-fiber interactions is crucial for various scientific and industrial applications.

Purpose of the Study:

  • To investigate the formation and equilibrium geometries of compound droplets on fibers.
  • To analyze the behavior of different types of contact lines (triple and quadruple) in compound droplet systems.
  • To understand how contact line nature influences the detachment process of compound droplets on fibers.

Main Methods:

  • Experimental investigations of compound droplet formation and behavior.
  • Numerical simulations to model droplet geometries and contact line dynamics.
  • Analysis of surface tensions and their effect on contact line configurations.

Main Results:

  • Compound droplets form specific geometries on fibers.
  • Triple contact lines can either remain separate or merge into quadruple lines, depending on surface tensions.
  • The detachment process is significantly influenced by whether triple or quadruple contact lines are present.

Conclusions:

  • Compound droplets exhibit distinct behaviors on fibers compared to simple droplets.
  • Contact line type (triple vs. quadruple) is a critical factor determining the characteristic length during droplet detachment.
  • Understanding these complex fluidic systems advances knowledge in interfacial phenomena and droplet dynamics.