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Related Concept Videos

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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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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Molecular Weight of Step-Growth Polymers01:08

Molecular Weight of Step-Growth Polymers

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Step growth polymerization involves bi or multifunctional monomers. Bifunctional monomers react to form linear step growth polymers, whereas multifunctional monomers react to form non-linear or branched polymers.
As the step-growth polymerization involves step-wise condensation of monomers, the molecular weight also builds up eventually. Consequently, high molecular weight polymers are obtained at the late stages of the polymerization, where 99% of monomers have been consumed.
The extent of the...
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Rise of Liquid in a Capillary Tube01:18

Rise of Liquid in a Capillary Tube

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When very thin cylindrical tubes, called capillaries, are dipped in a liquid, the liquid rises or falls in the tube compared to the surrounding liquid. This phenomenon is called capillary action. Capillary action occurs due to the combination of two opposing forces: the cohesive forces of the liquid, which cause it to stick to itself and form a rounded shape, and the adhesive forces between the liquid and the walls of the container, which cause the liquid to be attracted to the container walls.
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Surface Tension, Capillary Action, and Viscosity02:57

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Surface Tension
The various IMFs between identical molecules of a substance are examples of cohesive forces. The molecules within a liquid are surrounded by other molecules and are attracted equally in all directions by the cohesive forces within the liquid. However, the molecules on the surface of a liquid are attracted only by about one-half as many molecules. Because of the unbalanced molecular attractions on the surface molecules, liquids contract to form a shape that minimizes the number...
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Intermolecular Forces and Physical Properties02:56

Intermolecular Forces and Physical Properties

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Structure-Property Relationship in Capillary Foams.

Omotola Okesanjo1, J Carson Meredith1, Sven H Behrens1

  • 1School of Chemical and Biomolecular Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332, United States.

Langmuir : the ACS Journal of Surfaces and Colloids
|August 26, 2021
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Summary
This summary is machine-generated.

Researchers explored capillary foams, which use particles and oil for stability. Findings show particle wettability and oil-to-particle ratio significantly impact foam structure and properties, aiding future material development.

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Area of Science:

  • Colloid and Surface Science
  • Materials Science

Background:

  • Capillary foams are novel aqueous foams stabilized by colloidal particles and oil.
  • Their unique structure features oil-coated bubbles within an oil-bridged particle gel network.
  • Understanding structure-property relationships is crucial for developing new foam-based materials.

Purpose of the Study:

  • To investigate the impact of particle wettability, volume fraction, and oil-to-particle ratio on capillary foam structure.
  • To correlate foam properties (foamability, stability, rheology) with observed microstructure.
  • To advance the fundamental understanding of capillary foam behavior.

Main Methods:

  • Systematic variation of particle wettability, particle volume fraction, and oil-to-particle ratio.
  • Microstructural analysis of capillary foams.
  • Measurement of foamability, foam stability, and rheological parameters.

Main Results:

  • Particle wettability influences gel network formation and oil droplet inclusion.
  • Foam stability and rheology are primarily dependent on particle volume fraction.
  • Foamability and microstructure are sensitive to the oil-to-particle ratio.

Conclusions:

  • Particle wettability and oil-to-particle ratio are key factors controlling capillary foam microstructure and properties.
  • These findings provide fundamental insights for designing and optimizing capillary foam formulations.
  • This research facilitates future advancements in foam-related materials and processes.