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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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The process of surrounding a solute with solvent is called solvation. It involves evenly distributing the solute within the solvent. The rule of thumb for determining a solvent for a given compound is that like dissolves like. A good solvent has molecular characteristics similar to those of the compound to be dissolved. For example, polar solutions dissolve polar solutes, and apolar solvents dissolve apolar solutes. A polar solvent is a solvent that has a high dielectric constant (ϵ...
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Solubility03:00

Solubility

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Solution, Solubility, and Solubility Equilibrium
A solution is a homogeneous mixture composed of a solvent, the major component, and a solute, the minor component. The physical state of a solution—solid, liquid, or gas—is typically the same as that of the solvent. Solute concentrations are often described with qualitative terms such as dilute (of relatively low concentration) and concentrated (of relatively high concentration).
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Esters to Carboxylic Acids: Saponification01:25

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Esters can be hydrolyzed to carboxylic acids under acidic or basic conditions. Base-promoted hydrolysis of esters is a nucleophilic acyl substitution reaction in which esters react with an aqueous base, followed by an acid to give carboxylic acids. This reaction is also known as saponification because it forms the basis for making soaps from fats.
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Distillation: Vapor–Liquid Equilibria01:01

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Distillation is a separation technique that takes advantage of the boiling point properties of disparate elements in a mixture. To perform distillation, we begin by heating a miscible mixture of two liquids with a significant difference in boiling points (at least 20°C). As the solution heats up and reaches the bubble point of the more volatile component, some molecules of the more volatile component transition into the gas phase and travel upward into the condenser, which is a glass 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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Microfluidic Devices for Characterizing Pore-scale Event Processes in Porous Media for Oil Recovery Applications
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Stable oil-laden foams: Formation and evolution.

Rémy Mensire1, Elise Lorenceau2

  • 1Univ. Paris-Est, Laboratoire Navier (ENPC-IFSTTAR-CNRS), 2 Allée Kepler, 77420 Champs sur, Marne, France.

Advances in Colloid and Interface Science
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Summary
This summary is machine-generated.

Oil can interact with foam constructively, leading to oil-laden foams (OLF). This review explores the conditions, methods, structures (foamed emulsions and biliquid foams), and evolution of dry OLF systems.

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Area of Science:

  • Colloid and surface science
  • Materials science
  • Fluid dynamics

Background:

  • Oil-foam interactions are crucial in industries like detergency and fire-fighting.
  • Oil can act as a defoamer or be integrated into foam structures.
  • Specific conditions allow oil to be trapped within aqueous foam networks, forming complex oil-laden foams (OLF).

Purpose of the Study:

  • To review the physical and chemical conditions for OLF formation.
  • To survey existing methods for obtaining OLF.
  • To discuss OLF structure, morphology, and evolution.

Main Methods:

  • Literature review of OLF systems.
  • Analysis of conditions favoring oil entrapment in foam.
  • Categorization of OLF morphologies (foamed emulsion, biliquid foam).

Main Results:

  • Identified conditions for OLF formation.
  • Described two distinct OLF structures: foamed emulsions and biliquid foams.
  • Reviewed the dynamic evolution of OLF, including topological changes and coarsening.

Conclusions:

  • Oil-laden foams represent complex three-phase fluid systems.
  • Understanding OLF formation and structure is key to their industrial application.
  • Further research on OLF evolution is needed to control their properties.