Mask-assisted electron radiation grafting for localized through-volume modification of porous substrates: influence of electron energy on spatial resolution

A. Forner-Cuenca, V. Manzi-Orezzoli, P. M. Kristiansen, L. Gubler, T. J. Schmidt, P. Boillat (Corresponding author)

Research output: Contribution to journalArticleAcademicpeer-review

8 Citations (Scopus)

Abstract

The spatial resolution aspects of the local modification of porous materials by electron induced graft-polymerization were studied by a combination of experiments and numerical simulations. Using blocking masks, only selected regions of the material were exposed to radiation and subsequently grafted. The main focus of this study is the application to gas diffusion layers, a carbonaceous ~200 µm thick porous substrate widely used in fuel cells, with the goal of improving water management by locally tuning the wettability. The comparison of experiments performed with different electron energies and corresponding simulations shows good agreement, identifying the energy threshold necessary to graft through the material to be approximately 150 keV. The impact of electron energy on spatial resolution was studied, showing that the blurring effects due to electron scattering reach a maximum at around 200 keV and are reduced at higher electron energies. Finally, the numerical simulations were used to define the conditions necessary to selectively graft only parts of bi-layer fuel cell materials.

Original languageEnglish
Pages (from-to)133-141
Number of pages9
JournalRadiation Physics and Chemistry
Volume135
DOIs
Publication statusPublished - 1 Jun 2017
Externally publishedYes

Keywords

  • Electron radiation grafting
  • Monte Carlo simulation
  • Patterned wettability
  • PEFCs
  • Porous material

Fingerprint Dive into the research topics of 'Mask-assisted electron radiation grafting for localized through-volume modification of porous substrates: influence of electron energy on spatial resolution'. Together they form a unique fingerprint.

  • Cite this