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The Electrical Double Layer01:30

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In the region where two bulk phases meet, an intricate electric charge distribution arises due to charge transfer, ion adsorption, molecular orientation, and charge distortion. This complex distribution is commonly referred to as the electrical double layer.When a solid electrode interfaces with ions in an electrolyte solution, the speed of electron transfer dictates the rates of oxidation and reduction. The electrode acquires a charge through the escape of atoms into the solution as cations or...
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A neutral atom consists of a positively charged nucleus surrounded by a negatively charged electron cloud. When placed in an external electric field, the external electric force pulls the electrons and nucleus apart, opposite to the intrinsic attraction between the nucleus and the electrons. The opposing forces balance each other with a slight shift between the center of masses of the nucleus and the electron cloud, resulting in a polarized atom. On the other hand, a few molecules, like water,...
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Finite Element Modelling of a Cellular Electric Microenvironment
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Modified colloidal primitive model as a homogeneous surface charge distribution: ζ-potential.

Héctor M Manzanilla-Granados1, Marcelo Lozada-Cassou

  • 1Escuela Superior de Computo, Instituto Politécnico Nacional , U. P. Adolfo López Mateos, Ciudad de México, 07738, México.

The Journal of Physical Chemistry. B
|August 21, 2013
PubMed
Summary

A new theory for colloidal dispersions reveals that smearing particle charges on the surface (modified colloidal primitive model) yields different results than central charges (colloidal primitive model). This impacts zeta-potential and colloid interactions.

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Area of Science:

  • Colloid and Interface Science
  • Physical Chemistry
  • Computational Physics

Background:

  • Colloidal dispersions are crucial in various scientific and industrial applications.
  • Understanding inter-colloid forces is key to predicting dispersion behavior.
  • Existing models like the colloidal primitive model (CPM) make simplifying assumptions about charge distribution.

Purpose of the Study:

  • To develop an integral equations theory for finite concentration colloidal dispersions.
  • To apply this theory to a modified colloidal primitive model (MCPM) with surface-smeared charges.
  • To compare MCPM results with the traditional CPM (central charges) for key properties.

Main Methods:

  • Derivation of an integral equations theory.
  • Application to a modified colloidal primitive model (MCPM) and comparison with the colloidal primitive model (CPM).
  • Calculation of zeta-potential, induced charge, and colloid-colloid electric effective force.

Main Results:

  • Significant quantitative and qualitative differences observed between MCPM and CPM for zeta-potential and effective forces.
  • MCPM yields a positive zeta-potential, while CPM yields a negative one, implying opposite electrophoretic mobilities.
  • Both models predict long-range colloid-colloid correlations and oscillatory, attraction-implying forces.

Conclusions:

  • The MCPM, with surface-smeared charges, offers a potentially more accurate representation for certain colloidal systems.
  • Charge distribution significantly influences colloidal behavior, including electrophoretic mobility.
  • Long-range attractions exist between like-charged colloids, consistent with simulations.