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Related Concept Videos

The Colloidal State01:29

The Colloidal State

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...
Colloidal precipitates01:09

Colloidal precipitates

The high insolubility of some precipitates can result in an unfavorable relative supersaturation. This can lead to colloidal particles with a large surface-to-mass ratio, where adsorption is promoted. For instance, in the precipitation of silver chloride, silver ions are adsorbed on the surface of the colloidal particles, forming a primary layer. This layer attracts ions of opposite charge (such as nitrate ions), forming a diffuse secondary layer of adsorbed ions. This electric double layer...
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...
Bioavailability Enhancement: Drug Stability Enhancement and GI Retention01:05

Bioavailability Enhancement: Drug Stability Enhancement and GI Retention

Improving a drug's stability in the gastrointestinal (GI) tract is paramount for enhancing its bioavailability and therapeutic effectiveness. Various strategies are employed to protect the drug from the harsh gastric milieu and to ensure its release and absorption at the desired site within the GI tract.Polymer coatings are one such method used to shield drugs from the stomach's acidic environment. By preventing premature drug release, these coatings improve the bioavailability of unstable...
Factors Affecting Dissolution: Polymorphism, Amorphism and Pseudopolymorphism01:21

Factors Affecting Dissolution: Polymorphism, Amorphism and Pseudopolymorphism

Polymorphism refers to the existence of a drug substance in multiple crystalline forms, known as polymorphs. Recently, this term has been expanded to include solvates (forms containing a solvent), amorphous forms (non-crystalline forms), and desolvated solvates (forms from which the solvent has been removed).
Some polymorphic crystals possess lower aqueous solubility than their amorphous counterparts, leading to incomplete absorption. For instance, the oral suspension of Chloramphenicol, which...
Colloids and Suspensions01:17

Colloids and Suspensions

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 visible to the naked eye or seen with a magnifying glass. They are cloudy, and the suspended particles settle out after mixing. The suspended particles in a suspension settle out after some time of mixing. The separation of particles from a suspension is...

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Anionic Polymerization of an Amphiphilic Copolymer for Preparation of Block Copolymer Micelles Stabilized by &#960;-&#960; Stacking Interactions
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Anionic Polymerization of an Amphiphilic Copolymer for Preparation of Block Copolymer Micelles Stabilized by π-π Stacking Interactions

Published on: October 10, 2016

Block polyelectrolytes and colloidal stability.

Martin Turesson1, Torbjörn Akesson, Jan Forsman

  • 1Theoretical Chemistry, Chemical Centre, P.O. Box 124, S-221 00 Lund, Sweden. martin.turesson@teokem.lu.se

Journal of Colloid and Interface Science
|October 22, 2008
PubMed
Summary
This summary is machine-generated.

Block polymers with charged end blocks can overcharge surfaces, creating repulsion at large distances and attraction at short distances. Short chains with small charged ends and long neutral mid-blocks are best for rapid flocculation.

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Area of Science:

  • Colloid and Surface Science
  • Polymer Physics
  • Computational Chemistry

Background:

  • Charged surfaces interact with polyelectrolytes, influencing colloidal stability.
  • Block polymers offer unique adsorption and bridging capabilities.
  • Understanding equilibrium and non-equilibrium conditions is crucial for predicting interactions.

Purpose of the Study:

  • To simulate and analyze interactions between charged surfaces and block polymers.
  • To investigate the role of polymer architecture in surface charge modification.
  • To design efficient flocculants by optimizing polymer structure for desired interactions.

Main Methods:

  • Utilized a novel simulation technique enabling full thermodynamic equilibrium.
  • Simulated interactions between charged flat surfaces and block polyions.
  • Analyzed adsorption, overcharging, and bridging forces at varying surface separations.

Main Results:

  • Block polyions strongly adsorb, leading to surface overcharging and a double-layer repulsion at large separations.
  • Bridging forces dominate at short separations, causing attraction.
  • A free energy barrier exists at intermediate separations due to repulsion.

Conclusions:

  • Short polymer chains with small, charged end blocks and long neutral mid-blocks are predicted to be effective flocculants.
  • Optimized polymer design can minimize repulsion barriers while maintaining bridging attraction.
  • The study considers both equilibrium and non-equilibrium scenarios for practical relevance.