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Spot Variation Fluorescence Correlation Spectroscopy for Analysis of Molecular Diffusion at the Plasma Membrane of Living Cells
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Fluctuation-induced extensive molecular transport via modulation of interaction strength
1Department of Chemistry, Hankuk University of Foreign Studies, Yongin 17035, Republic of Korea. ceun@hufs.ac.kr.
Physical Chemistry Chemical Physics : PCCP
|January 29, 2025
Summary
Molecular interaction strength dictates transport through carbon nanotubes. Moderate strength induces large fluctuations and oscillatory transport, exceeding nonpolar molecule transfer.
Area of Science:
- Physical Chemistry
- Nanotechnology
- Molecular Dynamics
Background:
- Previous studies explored intercompartmental transport of water and nonpolar molecules via carbon nanotubes.
- Free energy calculations showed limitations in water transport and partial transport for nonpolar molecules.
- Interaction strength was identified as a critical factor influencing molecular transport dynamics.
Purpose of the Study:
- To investigate the effect of interaction strength on molecular transport through carbon nanotubes.
- To analyze transport behavior kinetically and thermodynamically using models and simulations.
- To understand the relationship between molecular fluctuations and transport efficiency.
Main Methods:
- Utilized simple models and molecular simulation techniques.
- Performed free energy calculations and potential of mean force (PMF) analysis.
- Examined intercompartmental transport through a carbon nanotube model.
Main Results:
- Identified three transport regimes based on interaction strength: water-like, nonpolar-like, and transition.
- Observed significant molecular fluctuations and oscillatory transport in the transition regime.
- PMF analysis revealed a flat region supporting large fluctuations with no free energy cost.
Conclusions:
- Interaction strength is a key determinant of molecular transport behavior in nanotubes.
- Moderate interaction strength promotes large molecular fluctuations and enhanced transport.
- Molecular fluctuations play a crucial role in dictating intercompartmental transport efficiency.
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