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Related Concept Videos

Ion Exchange01:17

Ion Exchange

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 basic...
Gas Chromatography: Types of Columns and Stationary Phases01:17

Gas Chromatography: Types of Columns and Stationary Phases

Gas chromatography (GC) relies on stationary phases to separate and analyze components in a sample. There are two main types of stationary phases: liquid and solid. Liquid stationary phases are non-volatile, thermally stable, and chemically inert liquids coated onto the column. Solid stationary phases are particles of adsorbent material, such as silica gel or molecular sieves.
For an analyte to remain on the column for a sufficient amount of time, it must exhibit some level of compatibility (or...
Ion-Exchange Chromatography01:09

Ion-Exchange Chromatography

Ion-exchange chromatography, or IEC, is a technique for separating ions based on their affinity for the stationary phase. The stationary phase is a cross-linked polymer resin with covalently attached ionic functional groups. The functional groups can be either positively charged (cation exchangers) or negatively charged (anion exchangers). A cation exchanger consists of a polymeric anion and active cations, while an anion exchanger is a polymeric cation with active anions. The choice of...
Principles Of Column Chromatography01:13

Principles Of Column Chromatography

The chromatography technique was first invented in 1901 by Michael S. Tswett, a Russian botanist, to separate plant pigments using organic solvents. Further, in 1941, Archer John Porter Martin and R. L. M. Synge modified the technique by packing silica gel into a column. A mixture of amino acids was then separated on the packed column using chloroform and water mixture as the mobile phase. This was the first report on column chromatography. At present, column chromatography is a widely used...
Intermolecular Forces03:13

Intermolecular Forces

Atoms and molecules interact through bonds (or forces): intramolecular and intermolecular. The forces are electrostatic as they arise from interactions (attractive or repulsive) between charged species (permanent, partial, or temporary charges) and exist with varying strengths between ions, polar, nonpolar, and neutral molecules. The different types of intermolecular forces are ion–dipole, dipole–dipole, hydrogen bonds, and dispersion; among these, dipole–dipole, hydrogen bonds, and dispersion...
Affinity Chromatography01:03

Affinity Chromatography

Affinity chromatography is a powerful technique extensively utilized for separating and purifying specific biomolecules from complex mixtures. It capitalizes on the highly selective binding between an analyte and its counterpart, such as antibody-antigen interactions. The counterpart is immobilized on the stationary phase, forming an affinity column. The stationary phase typically consists of solid support, such as agarose or porous glass beads, immobilizing the affinity ligand. The mobile...

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Updated: Jun 3, 2026

Assembly and Characterization of Polyelectrolyte Complex Micelles
08:44

Assembly and Characterization of Polyelectrolyte Complex Micelles

Published on: March 2, 2020

Polyelectrolyte-mediated bridging interactions: columnar macromolecular phases.

Matjaž Ličer1, Rudolf Podgornik

  • 1Department of Physics, Faculty of Mathematics and Physics, University of Ljubljana, SI-1000 Ljubljana, Slovenia.

Journal of Physics. Condensed Matter : an Institute of Physics Journal
|March 10, 2011
PubMed
Summary
This summary is machine-generated.

We developed a theory for charged polymer chains near macroions, revealing that polyelectrolyte bridging causes attraction between like-charged stiff macroions. This bridging phenomenon can even lead to phase transitions in certain conditions.

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The Preparation of Electrohydrodynamic Bridges from Polar Dielectric Liquids

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Area of Science:

  • Statistical Mechanics
  • Soft Matter Physics
  • Physical Chemistry

Background:

  • Charged polymer chains (polyelectrolytes) and stiff macroions are crucial in biological and synthetic systems.
  • Understanding their interactions is key to controlling material properties and biological functions.
  • Existing theories often struggle to capture complex behaviors like bridging and like-charge attraction.

Purpose of the Study:

  • To develop a mean-field theory for charged polymer chains in external electrostatic fields.
  • To investigate the statistical mechanics of polyelectrolyte chains interacting with stiff cylindrical macroions.
  • To analyze phenomena like polyelectrolyte bridging and its effect on macroion interactions.

Main Methods:

  • Developed a mean-field theory applicable to weak and strong coupling limits.
  • Applied Debye-Hückel framework for salt effects and derived a screened Coulomb potential.
  • Utilized Green's function and solved the Edwards equation numerically.
  • Reformulated theory for strong coupling using Poisson-Boltzmann equations and minimized free energy.

Main Results:

  • Demonstrated polyelectrolyte bridging, leading to like-charge attraction between stiff macroions.
  • Showed bridging attractions are of entropic origin.
  • Calculated self-consistently determined monomer density and electrostatic fields.
  • Observed a phase transition between two hexagonal phases driven by osmotic pressure.

Conclusions:

  • Polyelectrolyte bridging is a key mechanism for like-charge attraction between stiff macroions.
  • The developed theory accurately describes complex polyelectrolyte-macroion interactions.
  • Bridging can induce significant structural changes, including phase transitions, in such systems.