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Related Concept Videos

Micelles01:30

Micelles

197
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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The Colloidal State01:29

The Colloidal State

138
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...
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Complexation Equilibria: Factors Influencing Stability of Complexes01:09

Complexation Equilibria: Factors Influencing Stability of Complexes

965
In complexation reactions, metal cations are the electron pair acceptors, and the ligands are the electron pair donors. The stability of the metal complexes depends primarily on the complexing ability of the central metal ion and the nature of the ligands. Generally, the complexing ability of the metal ion depends on the size and charge of the ion. As the metal ion size increases, the stability of the metal complexes decreases, provided that the valency of the metal ion and the ligands remain...
965
Ion Exchange01:17

Ion Exchange

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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...
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Anionic Chain-Growth Polymerization: Mechanism01:04

Anionic Chain-Growth Polymerization: Mechanism

2.6K
The mechanism for anionic chain-growth polymerization involves initiation, propagation, and termination steps. In the initiation step, a nucleophilic anion, such as butyl lithium, initiates the polymerization process by attacking the π bond of the vinylic monomer. As a result, a carbanion, stabilized by the electron‐withdrawing group, is generated. The resulting carbanion acts as a Michael donor in the propagation step and attacks the second vinylic monomer, which acts as a Michael...
2.6K
Cationic Chain-Growth Polymerization: Mechanism00:57

Cationic Chain-Growth Polymerization: Mechanism

3.0K
The cationic polymerization mechanism consists of three steps: initiation, propagation, and termination. In the initiation step of the polymerization process, the π bond of a monomer gets protonated by the Lewis acid catalyst, which is formed from boron trifluoride and water. The protonation of the π bond generates a carbocation stabilized by the electron‐donating group. In the propagation step, the π bond of the second monomer acts as a nucleophile and attacks the...
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Assembly and Characterization of Polyelectrolyte Complex Micelles
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Interpolyelectrolyte Complexes of Polycationic Micelles and Linear Polyanions: Structural Stability and Temporal

Jennifer E Laaser1, Yaming Jiang2, Shannon R Petersen

  • 1Department of Chemistry, University of Minnesota , 207 Pleasant Street Southeast, Minneapolis, Minnesota 55455, United States.

The Journal of Physical Chemistry. B
|December 19, 2015
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Polyelectrolyte complexation between micelles and homopolymers forms soluble complexes or aggregates. Ionic strength influences aggregate stability and structure, impacting future polyelectrolyte complex design.

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Area of Science:

  • Polymer Science
  • Materials Science
  • Physical Chemistry

Background:

  • Investigating polyelectrolyte complexation is crucial for developing advanced materials.
  • Understanding the self-assembly of block copolymer micelles is key to their application.

Purpose of the Study:

  • To explore the complexation of poly(dimethylaminoethyl methacrylate)-block-poly(styrene) micelles with poly(styrenesulfonate) homopolymers.
  • To determine the influence of ionic strength on the structure and stability of these polyelectrolyte complexes.

Main Methods:

  • Turbidimetric titration to monitor complexation.
  • Dynamic light scattering (DLS) for size distribution analysis.
  • Cryogenic transmission electron microscopy (cryoTEM) and small-angle X-ray scattering (SAXS) for structural characterization.

Main Results:

  • Soluble complexes formed when avoiding the charge-neutral point, with either polyelectrolyte in excess.
  • Initial complexes showed bimodal size distributions: contracted micelles and larger multimicelle aggregates.
  • Aggregate stability and structure were highly dependent on ionic strength and polyelectrolyte excess, with annealing observed at high ionic strength.

Conclusions:

  • The study reveals a complex interplay between kinetic and thermodynamic factors in polyelectrolyte complex formation.
  • Findings provide insights for designing polyelectrolyte complexes with tunable properties for various applications.