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Related Concept Videos

The Electrical Double Layer01:30

The Electrical Double Layer

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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Electrochemical systems provide a fascinating insight into the dynamic interplay of charged species within various phases. One notable example is the interaction between a membrane permeable to K⁺ ions but not to Cl⁻ ions, separating an aqueous KCl solution from pure water. As K⁺ ions diffuse through the membrane, they generate net charges on each phase, leading to a potential difference between them.Similarly, when a piece of Zn is immersed in an aqueous ZnSO₄ solution, the Zn metal, composed...
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Phase Behavior of Charged Vesicles Under Symmetric and Asymmetric Solution Conditions Monitored with Fluorescence Microscopy
10:08

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Published on: October 24, 2017

Lamellar phase coexistence induced by electrostatic interactions.

Y S Jho1, M W Kim, S A Safran

  • 1Materials Research Laboratory, University of California at Santa Barbara, 93106, Santa Barbara, CA, USA. joys76@gmail.com

The European Physical Journal. E, Soft Matter
|February 19, 2010
PubMed
Summary
This summary is machine-generated.

Charged biomolecule membranes can form distinct condensed and dilute phases due to electrostatic interactions. This phase separation, driven by counterions, is sensitive to salt concentration and counterion size.

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Area of Science:

  • Biophysics
  • Physical Chemistry
  • Materials Science

Background:

  • Charged membranes, particularly those with highly charged biomolecules, exhibit complex electrostatic interactions.
  • Counterions play a crucial role in mediating these interactions, influencing membrane behavior and phase formation.

Purpose of the Study:

  • To investigate the thermodynamic equilibrium and coexistence of condensed and dilute lamellar phases in charged membranes.
  • To predict the behavior of these phases under conditions of high membrane charge density, multivalent counterions, and varying counterion sizes and salt concentrations.

Main Methods:

  • Numerical simulations were employed to model the electrostatic interactions between charged membranes and counterions.
  • The study focused on predicting the nature of phase coexistence and the influence of parameters like charge density, counterion valency, size, and salt concentration.

Main Results:

  • Electrostatic interactions, mediated by counterions, can drive the formation of a condensed lamellar phase coexisting with a dilute phase.
  • The simulations predict the characteristics of this phase coexistence for biomolecule-like membrane charges and multivalent counterions.
  • Increasing salt concentration leads to electrostatic screening, which can disrupt the observed phase separation.

Conclusions:

  • Electrostatics alone can induce phase separation in charged membrane systems, leading to distinct condensed and dilute phases.
  • The phenomenon is tunable by factors such as counterion properties and salt concentration, with salt potentially abolishing phase separation.