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Related Concept Videos

The Colloidal State01:29

The Colloidal State

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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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Precipitate Formation and Particle Size Control01:16

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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.
The obtained precipitate should be either a pure substance of known composition or easily converted to one by a simple process, such as ignition or drying. In addition, the precipitate should be insoluble and easily filterable. In general, filterability...
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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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Colloids03:22

Colloids

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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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Phase Transitions: Vaporization and Condensation02:39

Phase Transitions: Vaporization and Condensation

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The physical form of a substance changes on changing its temperature. For example, raising the temperature of a liquid causes the liquid to vaporize (convert into vapor). The process is called vaporization—a surface phenomenon. Vaporization occurs when the thermal motion of the molecules overcome the intermolecular forces, and the molecules (at the surface) escape into the gaseous state. When a liquid vaporizes in a closed container, gas molecules cannot escape. As these gas phase molecules...
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Liquid-cell Transmission Electron Microscopy for Tracking Self-assembly of Nanoparticles
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Modeling Evaporation and Particle Assembly in Colloidal Droplets.

Mingfei Zhao1, Xin Yong1

  • 1Department of Mechanical Engineering, Binghamton University , Binghamton, New York 13902, United States.

Langmuir : the ACS Journal of Surfaces and Colloids
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Nanoparticles at the liquid-vapor interface reduce surface tension and enhance evaporation. Their distribution and density control droplet evaporation and final deposit patterns, crucial for applications like printing and coating.

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Area of Science:

  • Colloid science
  • Fluid dynamics
  • Materials science

Background:

  • Evaporation-induced nanoparticle assembly is vital for printing, coating, and thin film processing.
  • Understanding particle dynamics in evaporating droplets offers hydrodynamic insights into processing-structure relationships.

Purpose of the Study:

  • To simulate evaporating colloidal droplets on solid substrates using a multiphase lattice Boltzmann method coupled with Brownian dynamics.
  • To quantify the influence of interface-bound nanoparticles on surface tension and evaporation.
  • To investigate the correlation between particle dynamics, assembly, and evaporation-induced convection.

Main Methods:

  • Developed a free-energy-based multiphase lattice Boltzmann method.
  • Coupled the method with Brownian dynamics for particle simulations.
  • Simulated evaporating colloidal droplets on substrates with varying wetting properties.

Main Results:

  • Interface-bound nanoparticles were found to reduce surface tension and increase evaporation flux.
  • Droplet evaporation rate is influenced by the density and distribution of interfacial particles.
  • Distinct final deposit patterns were observed for bulk-dispersed versus interface-bound particles.

Conclusions:

  • Nanoparticle behavior at the liquid-vapor interface significantly impacts droplet evaporation and deposit morphology.
  • The wetting properties of the substrate play a role in the final deposit patterns.
  • This research provides fundamental insights for controlling self-organization in colloidal systems.