Nanoindentation measurements of teflon-AF nanosheets

Ina Rianasari, James Weston, Reza Rowshan, Thomas Blanton, Sachin Khapli, Ramesh Jagannathan

Research output: Contribution to journalArticle

Abstract

We report the formation of cohesive, mechanically robust thin films of Teflon-AF formed via self-assembly of nanoparticles at both air/water and oil/water interfaces of micro-emulsion droplets. We also present results of morphological and mechanical investigations of thin films formed at these oil/water interfaces. Scanning electron microscope and low angle X-ray diffraction characterization of drop cast thin films from the micro-emulsions showed the presence of stacks of nanosheets with an average thickness of 6 nm. Atomic force microscopy (AFM) characterization put the thickness at a much lower value of around 2 nm implying that these sheets are comprised of molecular sheets of Teflon-AF. AFM characterization also indicated that these sheets are stretched molecular films comprising inter-diffused molecular chains, arranged in a regular fashion. Nanoindentation studies of these films unambiguously demonstrated the "tablet sliding" mechanism, similar to nacre, for dissipating applied stress.

Original languageEnglish (US)
Article number41360
JournalJournal of Applied Polymer Science
Volume132
Issue number4
DOIs
StatePublished - Jan 1 2015

Keywords

  • Amorphous
  • Mechanical properties
  • Properties and characterization

ASJC Scopus subject areas

  • Chemistry(all)
  • Surfaces, Coatings and Films
  • Polymers and Plastics
  • Materials Chemistry

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