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This study measures membrane potential (Vmem) in nanopores with various ions, revealing how salt concentration and pore asymmetry affect energy conversion and cell processes.

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Area of Science:

  • Electrochemistry
  • Biophysical Chemistry
  • Nanotechnology

Background:

  • Membrane potential (Vmem) is crucial for electrochemical energy harvesting and conversion.
  • Vmem and ionic concentrations regulate vital cellular processes in biophysical chemistry.

Purpose of the Study:

  • To experimentally and theoretically investigate the salt dependence of Vmem in single conical nanopores.
  • To analyze multi-ionic systems with varying ionic charge numbers.
  • To understand the interplay between ion concentration, pore structure, and Vmem.

Main Methods:

  • Experimental measurement of Vmem using diverse ions (Na+, K+, Ca2+, Cl-, SO42-).
  • Theoretical modeling of multi-ionic systems within nanopores.
  • Analysis of physicochemical effects arising from nanostructure asymmetry.

Main Results:

  • Quantified Vmem dependence on salt concentrations for biologically and energetically relevant ions.
  • Elucidated the impact of conical nanopore asymmetry on Vmem.
  • Developed a predictive theoretical model for multi-ionic Vmem.
  • Determined the contribution of liquid junction potentials to the total Vmem.

Conclusions:

  • Membrane potential in nanopores is sensitive to ion type, concentration, and pore geometry.
  • The findings advance understanding of energy conversion and cellular ion transport mechanisms.
  • The developed model provides a tool for predicting Vmem in complex ionic environments.