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Related Concept Videos

Surface Active Agents01:27

Surface Active Agents

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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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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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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Cycloaddition Reactions: MO Requirements for Thermal Activation01:16

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Thermal cycloadditions are reactions where the source of activation energy needed to initiate the reaction is provided in the form of heat. A typical example of a thermally-allowed cycloaddition is the Diels–Alder reaction, which is a [4 + 2] cycloaddition. In contrast, a [2 + 2] cycloaddition is thermally forbidden.
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Dissolution kinetics, an essential aspect of oral drug delivery, is significantly influenced by the drug's particle size. According to the Noyes-Whitney dissolution model, the dissolution rate correlates directly with the drug's surface area. The larger the surface area, the higher the drug's solubility in water, leading to a faster drug dissolution rate. Reducing particle size increases the effective surface area, enhancing the dissolution process. Micronization and nanosizing are employed to...

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Enhanced Oil Recovery using a Combination of Biosurfactants
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Competitive interactions between components in surfactant-cosurfactant-additive systems.

Radhouane Chaghi1, Louis-Charles de Ménorval, Clarence Charnay

  • 1Institut Charles Gerhardt, Equipe Agrégats, Interfaces et Matériaux pour l'Energie, CNRS UMR 5253, Université Montpellier 2, C.C. 1502, Place Eugène Bataillon, 34095 Montpellier cedex 5, France.

Journal of Colloid and Interface Science
|January 30, 2010
PubMed
Summary

This study reveals how phenol, heptanol, and heptanoic acid interact within hexadecyltrimethylammonium bromide (HTAB) micelles. Phenol

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Area of Science:

  • Physical Chemistry
  • Supramolecular Chemistry
  • Colloid Science

Background:

  • Surfactant micelles are crucial in various chemical and biological processes.
  • Understanding additive interactions within micelles is key to controlling their properties.
  • Hexadecyltrimethylammonium bromide (HTAB) is a common cationic surfactant used in micellar studies.

Purpose of the Study:

  • To investigate the complex interactions of phenol (PhOH), heptanol (HeOH), and heptanoic acid (HeOIC) with HTAB micelles.
  • To determine the location and behavior of these additives within the micellar structure.
  • To elucidate the thermodynamic and spectroscopic consequences of these interactions.

Main Methods:

  • (1)H NMR spectroscopy to probe molecular location and interactions.
  • Titration calorimetry to measure heat changes associated with solubilization.
  • Solution conductimetry to assess changes in micellar aggregation and properties.

Main Results:

  • Phenol was found to reside in both the hydrophobic core and near the quaternary ammonium groups of HTAB micelles.
  • Heptanoic acid enhanced phenol's penetration into the micellar core.
  • Solubilization of phenol was exothermic and reduced the entropy of micellization, with competitive displacement of heptanol and heptanoic acid at higher phenol concentrations.

Conclusions:

  • The location and interactions of phenol within HTAB micelles are influenced by the presence of co-solvents like heptanol and heptanoic acid.
  • Thermodynamic data indicate favorable exothermic interactions upon phenol solubilization, but with entropic penalties.
  • Competitive solubilization effects were observed, suggesting a complex interplay of forces within the micellar system.