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Related Concept Videos

Micelles01:30

Micelles

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...
Colloids03:22

Colloids

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...
Membrane Fluidity01:23

Membrane Fluidity

Cell membranes are composed of phospholipids, proteins, and carbohydrates loosely attached to one another through chemical interactions. Molecules are generally able to move about in the plane of the membrane, giving the membrane its flexible nature called fluidity. Two other features of the membrane contribute to membrane fluidity: the chemical structure of the phospholipids and the presence of cholesterol in the membrane.Fatty acids tails of phospholipids can be either saturated or...
Membrane Fluidity01:26

Membrane Fluidity

Membrane fluidity is explained by the fluid mosaic model of the cell membrane, which describes the plasma membrane structure as a mosaic of components—including phospholipids, cholesterol, proteins, and carbohydrates—that gives the membrane a fluid character.
Mosaic nature of the membrane
The mosaic characteristic of the membrane helps the plasma membrane remain fluid. The integral proteins and lipids exist as separate but loosely-attached molecules in the membrane. The membrane is a relatively...
Asymmetric Lipid Bilayer01:35

Asymmetric Lipid Bilayer

Biological membranes show uneven distribution of different types of lipids in the inner and outer layers, resulting in transverse asymmetric membranes. The treatment of the erythrocyte membrane with the enzyme phospholipase confirmed the asymmetric nature of the lipid bilayer. The enzyme hydrolyzes lipids into fatty acids and hydrophilic groups. The phospholipase acts only on the outer layer of the membrane, while the inner layer remains intact. The phospholipase treatment resulted in 80%...
Enthalpy of Solution02:39

Enthalpy of Solution

There are two criteria that favor, but do not guarantee, the spontaneous formation of a solution:

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Updated: Jun 9, 2026

Fluorescence Recovery after Merging a Droplet to Measure the Two-dimensional Diffusion of a Phospholipid Monolayer
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Published on: October 15, 2015

On the composition fluctuations of reverse micelles.

Sergey A Tovstun1, Vladimir F Razumov

  • 1Institute of Problems of Chemical Physics, Russian Academy of Sciences, Acad. Semenov Av. 1, Chernogolovka, Moscow Region 142432, Russia. tovstun@icp.ac.ru

Journal of Colloid and Interface Science
|August 31, 2010
PubMed
Summary

Polydispersity in reverse micelles arises from composition fluctuations. This study quantifies these fluctuations using water vapor pressure, revealing a relative standard deviation of about 10% in a common microemulsion system.

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Area of Science:

  • Colloid and Surface Chemistry
  • Physical Chemistry

Background:

  • Reverse micelles are self-assembled aggregates crucial in microemulsions.
  • Their polydispersity, or size variation, is primarily driven by compositional fluctuations.
  • Understanding these fluctuations is key to controlling microemulsion properties.

Purpose of the Study:

  • To investigate and quantify the composition fluctuations in reverse micelles.
  • To establish a method for calculating these fluctuations from measurable properties.
  • To relate composition fluctuations to the overall behavior of microemulsions.

Main Methods:

  • Utilized the Gaussian approximation to model composition fluctuations.
  • Analyzed the dependence of water vapor pressure on molar ratio (W) in the microemulsion.
  • Calculated the standard deviation of the water-to-surfactant ratio (w).

Main Results:

  • Demonstrated that the standard deviation of w can be derived from water vapor pressure data.
  • Estimated the relative standard deviation of w to be approximately 10% for a sodium bis(2-ethylhexyl)sulfosuccinate/water/isooctane system at 37°C.
  • Established a relationship between composition fluctuation magnitude and the dependence of average composition on micelle concentration.

Conclusions:

  • Compositional fluctuations significantly contribute to reverse micelle polydispersity.
  • Water vapor pressure measurements provide a viable method for quantifying these fluctuations.
  • The magnitude of fluctuations is linked to how average micelle composition changes with concentration.