Related Experiment Video
Updated: Apr 23, 2026
10:53
Anionic Polymerization of an Amphiphilic Copolymer for Preparation of Block Copolymer Micelles Stabilized by π-π Stacking Interactions
Published on: October 10, 2016
12.8K
Structural aspects of heteropolyacid microemulsions
Mrinal K Bera1, Ross J Ellis, Benjamin P Burton-Pye
1Chemical Sciences and Engineering Division, Argonne National Laboratory, Argonne, IL 60439, USA. mrinalkb@anl.gov rellis@anl.gov mantonio@anl.gov.
Physical Chemistry Chemical Physics : PCCP
|September 19, 2014
Summary
X-ray scattering reveals structures in dense fluid phases of Keggin heteropolyacids. The Baxter sticky sphere model accurately predicts mesoscale assembly and interactions in these systems.
Area of Science:
- Materials Science
- Physical Chemistry
- Chemical Physics
Background:
- Dense fluid phases, or "third" phases, are formed in Keggin heteropolyacid-tri-n-butyl phosphate (TBP)-n-alkane systems.
- These phases are crucial in processes like solvent extraction and chemical separations.
- Understanding their mesoscale assembly and interactions is key to optimizing these applications.
Purpose of the Study:
- To provide metrical insights into the structure of dense fluid phases in Keggin heteropolyacid systems.
- To investigate the role of TBP solvates and their interactions.
- To establish a predictive model for mesoscale assembly in these complex systems.
Main Methods:
- Small-angle X-ray scattering (SAXS) experiments were conducted on dense fluid phases.
- Data analysis involved the Baxter sticky sphere model to interpret scattering patterns.
- Inter-acid separations and inter-cluster interaction energies were calculated.
Main Results:
- SAXS revealed inter-acid correlation peaks, indicating average P···P, Si···Si, and Al···Al separations of 18-23 Å.
- These separations are consistent with the formation of TBP solvates via hydrogen bonding.
- The Baxter sticky sphere model demonstrated identical structures across dense phases with interaction energies of ~5kBT.
Conclusions:
- The Baxter sticky sphere model is essential for interpreting SAXS data and predicting mesoscale assembly in heteropolyacid microemulsions.
- Interactions between heteropolyacid solvates drive condensation and dictate scattering data.
- The study provides mesostructural information complementing electrochemical behaviors in solvent extraction systems.
More Related Videos
Related Concept Videos
01:30Micelles
336
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...
336
01:27Surface Active Agents
146
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...
146
01:19Physical Properties of Carboxylic Acid Derivatives
2.5K
Intermolecular forces dictate several physical properties such as boiling points, melting points, solubilities, and so forth. They are classified into four types: ionic forces, hydrogen bonds, dipole–dipole forces, and dispersion forces. Ionic forces are the strongest, while dispersion forces are the weakest.
Among the carboxylic acid derivatives, the boiling points of acid chlorides and esters are very similar and are the lowest in the series. Acid anhydrides have slightly higher boiling...
Among the carboxylic acid derivatives, the boiling points of acid chlorides and esters are very similar and are the lowest in the series. Acid anhydrides have slightly higher boiling...
2.5K
01:31Physical Properties of Carboxylic Acids
5.2K
Carboxylic acids with lower molecular weight exhibit a sharp and unpleasant odor. They also have higher boiling and melting points than analogous compounds, such as aldehydes, ketones, and alcohols.
5.2K
03:00Solubility
16.8K
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,...
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,...
16.8K
03:22Colloids
17.1K
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...
17.1K