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Area of Science:

  • Biomaterials Science
  • Neutron Scattering
  • Bioelectronics

Background:

  • Electrically functional biomaterials are crucial for novel sensing applications.
  • Material hydration significantly impacts conductivity, especially in ion/proton transport systems.
  • The specific water morphology in hydrated biomaterials and its effect on conductivity remain under-explored.

Purpose of the Study:

  • To investigate the 'water morphology' of hydrated eumelanin, a model bioelectronic material.
  • To correlate water structure with ionic conductivity using inelastic neutron scattering (INS).
  • To develop a methodology for hydration-dependent INS experiments.

Main Methods:

  • Utilized inelastic neutron scattering (INS) to study eumelanin at varying hydration levels.
  • Developed a new methodology for hydration-dependent INS experiments.
  • Modeled dry eumelanin spectra and extracted water scattering signals from difference spectra at higher hydration.

Main Results:

  • The water structure in hydrated eumelanin is primarily interfacial water, with 3-5 layers and no bulk water.
  • Potential signatures of proton cations, likely the Zundel ion, were detected in the biopolymer/water system.
  • These findings suggest a dominance of interfacial water in soft proton ionomer systems.

Conclusions:

  • The water morphology in eumelanin is dominated by interfacial water, not bulk water.
  • The detection of Zundel ion signatures offers new perspectives on proton transport in biomaterials.
  • Understanding water morphology is key to advancing ionic charge transport mechanisms in hydrated bioelectronics.