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Aquaporins01:25

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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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Efficient Water Self-Diffusion in Diphenylalanine Peptide Nanotubes.

Pavel S Zelenovskiy1,2, Eddy M Domingues3, Vladislav Slabov4

  • 1Department of Chemistry & CICECO-Aveiro Institute of Materials, University of Aveiro, 3810-193 Aveiro, Portugal.

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Water diffusion in diphenylalanine (FF) nanotubes changes from ballistic to Fickian based on cluster size. This discovery opens new possibilities for FF nanotubes in nanofluidic devices.

Keywords:
diphenylalaninenanofluidicspeptide nanotubeswater diffusionwater sorption

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Area of Science:

  • Biomaterials science
  • Nanotechnology
  • Physical chemistry

Background:

  • Diphenylalanine (FF) nanotubes are self-assembled dipeptide nanostructures with diverse functional properties.
  • Nanoconfined water, both bound and free, plays a crucial role in FF nanotube self-assembly and function.
  • The precise mechanism of water motion within FF nanotubes was previously unclear.

Purpose of the Study:

  • To investigate the sorption properties of FF nanotubes as a microporous material.
  • To analyze the self-diffusion of free water within FF nanotube nanochannels at varying temperatures.
  • To elucidate the relationship between water cluster size and diffusion behavior.

Main Methods:

  • Studied FF nanotube sorption properties.
  • Analyzed free water self-diffusion using temperature-dependent measurements.
  • Characterized diffusion regimes based on water cluster size.

Main Results:

  • Identified a transition in water diffusion regimes within FF nanotubes.
  • Observed ballistic diffusion for small water clusters (<5 molecules/unit cell).
  • Found Fickian diffusion for larger water clusters, with a diffusion coefficient of 1.3 × 10-10 m2 s-1 at 40% RH and 30 °C, increasing to 3 × 10-10 m2 s-1 at 65 °C.

Conclusions:

  • Water cluster size dictates the diffusion mechanism in FF nanotube nanochannels.
  • The unique water self-diffusion properties suggest potential applications in nanofluidic devices.
  • This research adds a new functional dimension to FF nanotube materials.