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Related Concept Videos

Surface Active Agents01:27

Surface Active Agents

135
Surfactants, named for their behavior at interfaces, positively adsorb at the interfaces of two phases, reducing interfacial tension. Their versatility as emulsifiers, detergents, and foaming agents stems from this ability. Surfactants, often termed amphiphiles, share the property of amphipathy, with molecules having both hydrophilic and hydrophobic portions. The hydrophilic part is called the head, and the hydrophobic part, including an elongated alkyl substituent, forms the tail.Surfactants...
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Colloids03:22

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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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Aqueous Solutions and Heats of Hydration02:42

Aqueous Solutions and Heats of Hydration

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Water and other polar molecules are attracted to ions. The electrostatic attraction between an ion and a molecule with a dipole is called an ion-dipole attraction. These attractions play an important role in the dissolution of ionic compounds in water.
When ionic compounds dissolve in water, the ions in the solid separate and disperse uniformly throughout the solution because water molecules surround and solvate the ions, reducing the strong electrostatic forces between them. This process...
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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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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).
In a solution, the solute particles (molecules,...
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Micelles01:30

Micelles

301
Micelle formation is an intricate process that hinges on the properties of amphiphilic or amphipathic molecules and the conditions of the system in which they are found. Amphiphilic molecules, which have both hydrophilic (water-attracting) and hydrophobic (water-repelling) parts, play a critical role in this process.In aqueous environments, these molecules arrange themselves such that their hydrophilic heads are turned towards the water phase, while their hydrophobic tails are oriented away...
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Aqueous Droplets Used as Enzymatic Microreactors and Their Electromagnetic Actuation
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Responsive aqueous foams.

Anne-Laure Fameau1, Adrian Carl, Arnaud Saint-Jalmes

  • 1UR1268 Biopolymères Interactions Assemblages, Institut National de la Recherche Agronomique, Rue de la Géraudière, F-44316 Nantes cedex 3 (France). anne-laure.fameau@nantes.inra.fr.

Chemphyschem : a European Journal of Chemical Physics and Physical Chemistry
|November 12, 2014
PubMed
Summary
This summary is machine-generated.

Responsive aqueous foams offer tunable stability, switching between states with environmental changes or stimuli. This review highlights strategies for designing these advanced soft materials using light, temperature, and magnetic fields.

Keywords:
emulsionsfoamsmagnetic propertiesstimuli-responsivesurfactants

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Area of Science:

  • Soft Matter Physics
  • Materials Science
  • Colloid and Surface Chemistry

Background:

  • Aqueous foams exhibit remarkable properties like ultrastability and responsiveness.
  • Responsive foams allow for tunable stability, switching between states based on environmental changes or external stimuli.
  • Foam stabilizers such as surfactants, proteins, polymers, and particles are used to create responsive foams.

Purpose of the Study:

  • To review strategies for designing responsive aqueous foams.
  • To highlight sophisticated approaches utilizing external stimuli for foam stability control.

Main Methods:

  • Reviewing two primary approaches for creating responsive foams.
  • Focusing on interfacial layer responsiveness and aqueous phase modifications.
  • Highlighting stimuli-responsive methods using light, temperature, and magnetic fields.

Main Results:

  • Responsive foams can be designed by altering the interfacial layer around gas bubbles.
  • Foam stability can be tuned by modifying the aqueous phase within foam channels.
  • External stimuli like light, temperature, and magnetic fields enable switchable foam stability.

Conclusions:

  • Responsive aqueous foams represent a sophisticated class of soft materials.
  • The design strategies discussed offer precise control over foam stability.
  • Future applications may leverage switchable foam properties for advanced material design.