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Related Concept Videos

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.
Surface tension varies...
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Characteristics of Fluids01:20

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When a force is applied parallel to the top surface of a solid, it resists the applied force due to the internal frictional forces between the layers of the solid known as shearing resistance. However, when the force is removed, the shearing forces restore the original shape of the solid. Other deformation forces also cause temporary changes in shape if the forces are not beyond a threshold magnitude. Solids tend to retain their shape, making the study of their rest and motion easier. Beyond...
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Characteristics of Fluids01:31

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Fluids differ from solids primarily in their molecular structure and stress response. Solids have tightly packed molecules with strong intermolecular forces, maintaining their shape and resisting deformation. In contrast, fluids have molecules spaced farther apart with weaker forces, allowing them to flow and deform easily.
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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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Types of Fluids01:27

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Fluids can be classified into Newtonian and non-Newtonian fluids based on their response to shear stress. Newtonian fluids have a linear relationship between shear stress and the shear strain rate, following Newton's law of viscosity. Their viscosity remains constant regardless of the shear rate, making their behavior predictable and easier to analyze. Common examples include water, air, oil, and gasoline.
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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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Experimental Measurement of Settling Velocity of Spherical Particles in Unconfined and Confined Surfactant-based Shear Thinning Viscoelastic Fluids
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Soft particles at a fluid interface.

Hadi Mehrabian1, Jens Harting2, Jacco H Snoeijer3

  • 1Physics of Fluids Group and J. M. Burgers Centre for Fluid Dynamics, University of Twente, P.O. Box 217, 7500 AE Enschede, The Netherlands. j.h.snoeijer@utwente.nl.

Soft Matter
|November 18, 2015
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Summary
This summary is machine-generated.

Highly deformable particles stabilize fluid interfaces. Their shape depends on elasticity and wetting, with molecular details crucial for complete wetting scenarios, challenging traditional elasticity theories.

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Area of Science:

  • Materials Science
  • Soft Matter Physics
  • Surface Chemistry

Background:

  • Particles are used as surface stabilizers in various industries like food, oil, and cosmetics.
  • Rigid particles are commonly used, but deformable particles offer adaptive properties at interfaces.

Purpose of the Study:

  • To compute the equilibrium shapes of soft elastic particles at fluid interfaces.
  • To investigate the influence of particle deformability, elasticity, and wetting behavior on particle conformation.
  • To compare molecular dynamics simulations with continuum elasticity theory.

Main Methods:

  • Molecular dynamics (MD) simulations of a cross-linked polymer gel.
  • Continuum calculations based on linear elasticity theory.
  • Analysis of particle shape under varying Young's modulus and wetting conditions (partial vs. complete).

Main Results:

  • Particle shape is influenced by Young's modulus and wetting properties.
  • Molecular simulations for partially wetting gels are accurately predicted by continuum theory.
  • For completely wetting gels, linear elasticity theory fails, and molecular details significantly impact equilibrium shape.

Conclusions:

  • Soft elastic particles offer promising alternatives to rigid stabilizers.
  • Wetting behavior is a critical factor determining the applicability of continuum theories for deformable particles.
  • Molecular simulations are essential for understanding particle behavior in complete wetting scenarios.