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Related Concept Videos

Colloids and Suspensions01:17

Colloids and Suspensions

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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 visible to the naked eye or seen with a magnifying glass. They are cloudy, and the suspended particles settle out after mixing. The suspended particles in a suspension settle out after some time of mixing. The separation of particles from a suspension is...
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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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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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Coagulation01:06

Coagulation

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Colloidal solids are solid particles suspended in solution. They are usually negatively charged, attracting a compact primary layer of positively charged ions, which attract more counterions to form an electrical double layer. Electrostatic repulsion between the charged double layers prevents the particles from colliding, stabilizing the colloids. These solids are often undesirable because they can contain toxins that are difficult to remove. Coagulation is a technique that helps aggregate and...
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Precipitate Formation and Particle Size Control01:16

Precipitate Formation and Particle Size Control

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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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Capillarity in Fluid01:19

Capillarity in Fluid

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Capillarity describes the movement of liquid in small spaces without external forces acting on it. The capillarity is driven by surface tension and adhesive interactions between the liquid and surrounding solid surfaces. This effect is often seen in narrow tubes, porous materials, and fine particles.
Surface tension is crucial to capillarity. It results from cohesive forces between liquid molecules at the liquid-air boundary, forming a skin that resists external forces. When the capillary tube...
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Confocal Imaging of Confined Quiescent and Flowing Colloid-polymer Mixtures
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Phase behavior and percolation in mixed patchy colloids.

Yiwei Zhu1, Walter G Chapman1

  • 1Department of Chemical and Biomolecular Engineering, Rice University, 6100 Main St., Houston, Texas 77005, USA.

The Journal of Chemical Physics
|April 9, 2021
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Summary
This summary is machine-generated.

This study introduces a new cluster distribution theory to accurately model patchy colloid systems, outperforming traditional methods and revealing key factors influencing phase behavior and percolation.

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Area of Science:

  • Colloid Science
  • Statistical Mechanics
  • Physical Chemistry

Background:

  • Patchy colloids exhibit unique phenomena due to directional interactions.
  • Traditional theories like TPT1 have limitations in modeling complex association sites.

Purpose of the Study:

  • To investigate the interplay between phase behavior and percolation in binary patchy colloid systems.
  • To compare the accuracy of cluster distribution theory, TPT1, and Monte Carlo simulations for modeling bonding states.

Main Methods:

  • Combined cluster distribution theory with generalized Flory and Stockmayer percolation theory.
  • Compared theoretical models with Monte Carlo simulations for binary patchy colloid systems.

Main Results:

  • Cluster distribution theory demonstrated excellent agreement with Monte Carlo simulations.
  • TPT1 showed significant deviations from simulation results.
  • Reduced density and relative bonding strength critically influence phase behavior and percolation.

Conclusions:

  • Cluster distribution theory provides a more accurate framework for modeling complex patchy colloid systems.
  • Percolation can occur in the vapor phase of binary systems under specific low-density and low-temperature conditions.