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Protein Diffusion in the Membrane01:24

Protein Diffusion in the Membrane

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Proteins show rotational as well as lateral diffusion across the membrane. The lateral diffusion of proteins was confirmed through the cell fusion experiment where mouse and human cells were fused, resulting in hybrid cells. When the human and mouse cells fused, the specific membrane proteins on human and mouse cells were marked with the red and green-fluorescent markers, respectively. Initially, the red and green fluorescence was located on the respective hemisphere of the cell. As time...
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Diffusion is the passive movement of substances down their concentration gradients—requiring no expenditure of cellular energy. Substances, such as molecules or ions, diffuse from an area of high concentration to an area of low concentration in the cytosol or across membranes. Eventually, the concentration will even out, with the substance moving randomly but causing no net change in concentration. Such a state is called dynamic equilibrium, which is essential for maintaining overall...
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Ion Diffusion through Nanocellulose Membranes: Molecular Dynamics Study.

Mohit Garg1, Igor Zozoulenko1,2

  • 1Laboratory of Organic Electronics, Department of Science and Technology (ITN), Linköping University, SE-60174 Norrköping, Sweden.

ACS Applied Bio Materials
|January 10, 2022
PubMed
Summary

Ionic diffusion in nanocellulose channels is slower than in bulk, influenced by charged groups and channel size. This study provides crucial theoretical insights for designing advanced energy storage membranes.

Keywords:
cellulose nanochannelsion conductivityion diffusionmolecular dynamics simulationsnanocellulose

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Computational Chemistry

Background:

  • Nanocellulose membranes show promise for energy storage devices like supercapacitors, batteries, and fuel cells.
  • Previous research fabricated cellulose-based membranes with confined ionic conductivity.
  • A theoretical understanding of ion diffusion in nanocellulose nanochannels is lacking.

Purpose of the Study:

  • To theoretically investigate the effect of nanoconfinement and charged surface groups on ion diffusion coefficients in cellulose nanochannels.
  • To unravel the mechanisms governing ionic diffusion within these nanochannels.
  • To provide a fundamental understanding for optimizing nanocellulose-based energy storage membranes.

Main Methods:

  • Atomistic molecular dynamics simulations were employed.
  • The study focused on ion diffusion within cellulose nanochannels.
  • Key parameters investigated included charged surface group density and channel height.

Main Results:

  • Ion diffusion coefficients in cellulose nanochannels are reduced compared to bulk values.
  • Diffusion is significantly affected by the density of charged surface groups and nanochannel height.
  • Coulomb interactions between ions and the channel surface are the primary cause of reduced diffusion.

Conclusions:

  • A critical structure/property relationship in nanocellulose nanochannels was revealed.
  • Accurate modeling of ion conductivity in nanomembranes requires considering diffusion coefficient dependence on surface charge and channel height.
  • These findings are important for Nernst-Plank-Poisson modeling and fitting experimental data for energy storage applications.