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Related Concept Videos

Aquaporins01:25

Aquaporins

Aquaporins or AQPs are a family of integral membrane proteins whose primary function is to transport water, while some called aquaglyceroporins also transport glycerol. In addition, aquaporins have also been suspected to be involved in transporting volatile substances, such as carbon dioxide and ammonia, across membranes. Such AQPs that act as gas channels are often highly expressed in cells involved in the gaseous exchange, such as red blood cells, epithelial cells, and pulmonary capillaries.

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Fine-tuning the Size and Minimizing the Noise of Solid-state Nanopores
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Published on: October 31, 2013

Single-file water in nanopores.

Jürgen Köfinger1, Gerhard Hummer, Christoph Dellago

  • 1Laboratory of Chemical Physics, Bldg. 5, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Bethesda, Maryland 20892, USA.

Physical Chemistry Chemical Physics : PCCP
|July 23, 2011
PubMed
Summary

Water confined in nanoscale pores forms single-file chains with unique properties. Studying these in carbon nanotubes reveals insights into biological water functions and potential nanotechnological applications.

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Last Updated: May 30, 2026

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Area of Science:

  • Physical Chemistry
  • Nanotechnology
  • Biophysics

Background:

  • Water confined in sub-nanometre pores forms single-file hydrogen-bonded chains.
  • Nanoscale confinement imparts unusual physical properties to water, relevant for biology and technology.
  • Carbon and boron nitride nanotubes offer model systems for studying intrinsic properties of single-file water.

Purpose of the Study:

  • To explore the physical properties of single-file water confined in apolar nanopores.
  • To investigate the role of electrostatic effects on charge transport and orientational order in water chains.
  • To compare water behavior in simple apolar pores with that in complex biological pores.

Main Methods:

  • Review of existing research on single-file water in apolar pores (carbon and boron nitride nanotubes).
  • Analysis of electrostatic effects governing water chain properties.
  • Comparative study of water in synthetic and biological pores.

Main Results:

  • Single-file water chains exhibit conserved characteristics across different pore types due to strong water-water hydrogen bonds.
  • Electrostatic interactions are the primary determinants of charge transport and orientational order.
  • Apolar pores with external fields can mimic biological pore functions.

Conclusions:

  • Understanding single-file water in apolar pores provides insights into biological water functions.
  • This knowledge facilitates the development of novel biomimetic and nanotechnological applications.
  • Differences and similarities between water in simple and complex pores are crucial for structure-function understanding.