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Related Concept Videos

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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Colloids and Suspensions01:17

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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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Design Example: Deciding Thickness of Lubricating Fluid in a Shaft01:23

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Effective lubrication between a rotating shaft and its bearing housing is essential in rotating machinery to minimize friction, wear, and energy loss. With carefully controlled thickness and viscosity, the lubricant layer prevents metal-to-metal contact, ensuring smooth operation.
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Viscosity01:17

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Surface Tension of Fluid01:22

Surface Tension of 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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Couette Flow01:22

Couette Flow

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Couette flow represents the flow of fluid between two parallel plates, with one plate fixed and the other moving with a constant velocity. This configuration allows for a simplified analysis using the Navier-Stokes equations, which govern fluid motion under conditions of viscosity and incompressibility. For Couette flow, the assumptions include a steady, laminar, incompressible flow with a zero-pressure gradient in the flow direction. This flow type is beneficial for understanding shear-driven...
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Hydrodynamic lubrication in colloidal gels.

K W Torre1, J de Graaf1

  • 1Institute for Theoretical Physics, Center for Extreme Matter and Emergent Phenomena, Utrecht University, Princetonplein 5, 3584 CC Utrecht, The Netherlands. k.w.torre@uu.nl.

Soft Matter
|September 23, 2023
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Summary
This summary is machine-generated.

Hydrodynamic lubrication forces significantly impact colloidal gel structure and aging, especially at low particle concentrations. Accurate modeling requires considering these short-ranged interactions alongside long-ranged ones for precise gel evolution insights.

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Area of Science:

  • Soft Matter Physics
  • Colloid Science
  • Materials Science

Background:

  • Colloidal gels are elasto-plastic materials formed by self-assembled particle networks.
  • Far-field hydrodynamic interactions influence gelation rates but not structure.
  • The role of short-ranged hydrodynamic lubrication during gel formation is unclear.

Purpose of the Study:

  • Investigate the impact of hydrodynamic lubrication on colloidal gel formation and structure.
  • Compare different hydrodynamic modeling approaches, including Brownian Dynamics, Rotne-Prager-Yamakawa, and Stokesian Dynamics.
  • Understand the interplay between short-ranged attractions and lubrication forces.

Main Methods:

  • Simulations using Brownian Dynamics (single-body), Rotne-Prager-Yamakawa (pairwise), and Stokesian Dynamics (many-body).
  • Analysis of gel structure and dynamics under varying hydrodynamic descriptions.
  • Focus on the influence of lubrication interactions at different colloid volume fractions.

Main Results:

  • Simulations confirm existing understanding for far-field interactions.
  • Lubrication forces significantly alter gel structure at low colloid volume fractions.
  • Dissipative lubrication interactions accelerate gel aging, irrespective of colloid concentration.
  • Lubrication facilitates collective dynamics, promoting phase-separation.

Conclusions:

  • Lubrication interactions are crucial for accurately modeling colloidal gel evolution.
  • Many-body lubricated hydrodynamic simulations are necessary for precise structural predictions.
  • Understanding lubrication is key to controlling colloidal gel properties.