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Micelles

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...

Surface Active Agents

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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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...

Solubility

Solubility

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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Detergent Purification of Membrane Proteins

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Detergents are used to purify the integral proteins of the membrane. The hydrophobic portion of the detergent can replace membrane phospholipids while solubilizing the membrane proteins. When detergent monomers reach a specific concentration in a solution called critical micelle concentration (CMC), they form micelles. Above CMC, the concentration of the detergent monomers remains in equilibrium with the micelle. The number of detergent monomers present in the CMC varies for each detergent, and...

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 the...

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Synthesis of Monocyte-targeting Peptide Amphiphile Micelles for Imaging of Atherosclerosis

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Micellar evolution in mixed nonionic/anionic surfactant systems.

Shaohua Lu¹, Jun Wu, Ponisseril Somasundaran

¹NSF Industry/University Cooperative Research Center (I/UCRC) for Particulate and Surfactant Systems at Columbia University, New York, NY 10027, USA.

Journal of Colloid and Interface Science

|November 26, 2011

Summary

This summary is machine-generated.

This study reveals the coexistence of two micelle types in mixed anionic/nonionic surfactant systems, crucial for optimizing industrial formulations. Understanding these synergistic interactions enhances formulation efficiency and cost-effectiveness.

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Area of Science:

Colloid and Surface Chemistry
Physical Chemistry
Materials Science

Background:

Surfactant mixtures, particularly anionic and nonionic types, are vital in diverse industrial applications like detergents and enhanced oil recovery.
Understanding the synergistic interactions and micellization behavior of these mixtures is key for optimizing formulation performance and efficiency.

Purpose of the Study:

To investigate the micellization behavior of a mixed n-dodecyl-β-D-maltoside (DM)/sodium dodecyl sulfonate (SDSN) surfactant system.
To determine interaction parameters, monomer concentrations, and micellar size/shape distributions.
To elucidate the underlying mechanisms for the observed aggregation behaviors, including the coexistence of different micelle types.

Main Methods:

Utilized a combination of experimental techniques: surface tensiometry, fluorescence spectroscopy, ultrafiltration, and analytical ultracentrifugation (AUC).
Analyzed the mixed surfactant system across varying total surfactant concentrations and mixing ratios.
Characterized micellar properties and thermodynamic parameters.

Main Results:

Identified the coexistence of two distinct micelle types in the mixed anionic/nonionic surfactant system for the first time.
Quantified interaction parameters, monomer concentrations, and micellar size and shape distributions.
Developed a model explaining micelle coexistence based on surface activities and inter-surfactant interactions.

Conclusions:

The findings provide a fundamental understanding of mixed surfactant aggregation, particularly the novel observation of dual micelle coexistence.
The proposed model offers insights into the complex interactions within mixed surfactant systems.
These results are directly applicable to optimizing the composition of mixed surfactant systems for enhanced synergetic efficiency and cost-effective formulations.