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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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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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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

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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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In fluid mechanics, buoyancy and stability are key concepts for understanding the behavior of submerged and floating bodies. When a stationary body is fully or partially submerged in a fluid, the fluid exerts a force on the body known as the buoyant force. This force acts vertically upward through a point called the center of buoyancy, which is the center of the displaced fluid volume. According to Archimedes' principle, the magnitude of the buoyant force is equal to the weight of the fluid...
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Surface tension is a fundamental property of fluids, occurring at the boundary between a liquid and a gas or between two immiscible liquids. This phenomenon arises from the cohesive forces between molecules at the fluid's surface, creating an effect similar to a stretched elastic membrane. Inside each fluid, molecules are equally attracted in all directions by neighboring molecules, but surface molecules experience a net inward force, resulting in surface tension.
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Hydrodynamic stability criterion for colloidal gelation under gravity.

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Gravity significantly impacts colloidal gel formation by causing early cluster sedimentation at low concentrations, disrupting network formation. At higher concentrations, the gel

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Area of Science:

  • Colloid and Surface Science
  • Soft Matter Physics
  • Computational Fluid Dynamics

Background:

  • Colloidal gels form solidlike networks from diffusing and aggregating particles.
  • Gravity affects post-gelation stability but its influence on gelation itself is understudied.
  • Understanding gel formation dynamics is crucial for material design.

Purpose of the Study:

  • To investigate the influence of gravity on the process of colloidal gel formation.
  • To identify conditions under which gravity disrupts or facilitates gelation.
  • To analyze the impact of buoyancy-driven flows on network development.

Main Methods:

  • Simulations using Brownian dynamics and lattice-Boltzmann algorithm.
  • Incorporation of hydrodynamic interactions and confined geometry.
  • Modeling buoyancy-induced flows due to density mismatch between colloids and fluid.

Main Results:

  • A stability criterion for network formation emerged, dependent on colloid volume fraction.
  • At low volume fractions, accelerated sedimentation of nascent clusters disrupts gelation.
  • At high volume fractions, mechanical strength dominates, leading to downward interface movement.
  • The final colloidal gel sediment is largely unaffected by initial formation flows.

Conclusions:

  • Gravity's effect on gelation is complex, involving competition between sedimentation and network formation.
  • Flows during formation can disrupt gelation at low concentrations.
  • The study provides insights into the life span of colloidal gels influenced by formation dynamics.