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Related Concept Videos

The Colloidal State01:29

The Colloidal State

189
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...
189

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Using Polystyrene-block-polyacrylic acid-coated Metal Nanoparticles as Monomers for Their Homo- and Co-polymerization
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Surface patch binding and mesophase separation in biopolymeric polyelectrolyte-polyampholyte solutions.

Jyotsana Pathak1, Kamla Rawat2, H B Bohidar3

  • 1Polymer and Biophysics Laboratory, School of Physical Sciences, Jawaharlal Nehru University, New Delhi 110067, India.

International Journal of Biological Macromolecules
|October 29, 2013
PubMed
Summary
This summary is machine-generated.

Surface patch binding (SPB) drives biopolymer complex coacervation via pH changes. Ionic strength influences coacervate yield, with electrostatic binding (EB) dominating at higher salt concentrations.

Keywords:
Complex coacervationInteraction potentialPhase diagramSurface patch binding

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Area of Science:

  • Biopolymer science
  • Physical chemistry
  • Materials science

Background:

  • Complex coacervation is crucial for biopolymer assembly.
  • Understanding the driving forces behind coacervation is key for material design.

Purpose of the Study:

  • Investigate surface patch binding (SPB) induced mesophase separation and complex coacervation.
  • Characterize the role of pH and ionic strength on coacervation of gelatin A-gelatin B, chitosan-gelatin A, chitosan-gelatin B, and agar-gelatin B.

Main Methods:

  • Turbidity measurements to identify critical pH transitions (pHc, pHΦ, pHprep).
  • Investigated effect of varying salt concentrations (0-0.3 M NaCl).
  • Modeled interaction potentials using a combination of attractive and repulsive forces.

Main Results:

  • SPB induced associative interactions at pHc, leading to soluble complexes.
  • Electrostatic binding (EB) drove coacervation transition at pHΦ.
  • Coacervate yield decreased with increasing ionic strength, suppressed beyond 50 mM NaCl.
  • Established a linear relationship between SPB index and zeta potential ratio.

Conclusions:

  • SPB and EB are distinct mechanisms governing biopolymer interactions and coacervation.
  • Ionic strength significantly impacts coacervation, with electrostatic interactions becoming dominant at higher concentrations.
  • Phase diagrams effectively map interaction regimes in biopolymer solutions.