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Related Concept Videos

Surface Active Agents01:27

Surface Active Agents

31
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...
31
Micelles01:30

Micelles

78
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...
78
Colloids03:22

Colloids

21.8K
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...
21.8K
Solubility03:00

Solubility

21.7K
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,...
21.7K
Ion Exchange01:17

Ion Exchange

1.4K
Ion exchange chromatography separates charged molecules from a solution by reversibly exchanging them with mobile, or 'active', ions associated with the oppositely charged stationary phase. This method can be used to separate ions, soften and deionize water, and purify solutions. The polymers comprising the ion-exchange column are high-molecular-weight and chemically stable polymers, crosslinked to be porous and essentially insoluble. They are also functionalized with either acidic or...
1.4K
Colloidal precipitates01:09

Colloidal precipitates

6.6K
The high insolubility of some precipitates can result in an unfavorable relative supersaturation. This can lead to colloidal particles with a large surface-to-mass ratio, where adsorption is promoted. For instance, in the precipitation of silver chloride, silver ions are adsorbed on the surface of the colloidal particles, forming a primary layer. This layer attracts ions of opposite charge (such as nitrate ions), forming a diffuse secondary layer of adsorbed ions. This electric double layer...
6.6K

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Self-Nanoemulsification of Healthy Oils to Enhance the Solubility of Lipophilic Drugs
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pH Switchable Emulsions Based on Dynamic Covalent Surfactants.

Gaihuan Ren1, Lei Wang1, Qianqian Chen1

  • 1Key Laboratory of Colloid and Interface Chemistry, Ministry of Education, Shandong University , Jinan, Shandong 250100, People's Republic of China.

Langmuir : the ACS Journal of Surfaces and Colloids
|March 11, 2017
PubMed
Summary
This summary is machine-generated.

New dynamic covalent surfactants create pH-switchable emulsions. These responsive emulsions can be switched between stable and separated states multiple times by adjusting pH, offering a novel approach for emulsion technology.

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Area of Science:

  • Materials Science
  • Supramolecular Chemistry

Background:

  • Emulsion stability is crucial in various industries.
  • Developing stimuli-responsive surfactants is an active area of research.

Purpose of the Study:

  • To design and synthesize dynamic covalent surfactants for pH-switchable emulsions.
  • To investigate the pH-triggered emulsification and demulsification behavior.

Main Methods:

  • Synthesis of polyethylenimine-benzaldehyde (PEI-B) dynamic covalent surfactants.
  • Characterization of dynamic covalent bond using 1H NMR and fluorescence probe.
  • Preparation and pH-triggered switching of emulsions with paraffin oil.

Main Results:

  • Successfully formed stable emulsions using PEI-B at pH 7.8.
  • Achieved complete phase separation at pH 3.5 due to dynamic covalent bond cleavage.
  • Demonstrated reversible emulsification/demulsification over at least three cycles.
  • Confirmed the dynamic nature and pH-responsiveness of the PEI-B surfactant.

Conclusions:

  • Dynamic covalent surfactants offer a novel route for creating pH-switchable emulsions.
  • The reversible formation and breaking of dynamic covalent bonds enable tunable emulsion stability.
  • This technology opens new possibilities for responsive delivery systems and separation processes.