Molecular Dynamics Simulation of Ice Indentation by Model Atomic Force Microscopy Tips

Julian Gelman Constantin*, Marcelo A. Carignano, Horacio R. Corti, Igal Szleifer

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

8 Scopus citations

Abstract

We have performed extensive molecular dynamics simulations of nanoindentation of an ice slab with model atomic force microscopy (AFM) tips. We found the presence of a quasi-liquid layer between the tip and the ice for all explored indentation depths. For the smallest tip studied (R = 0.55 nm), the force versus indentation depth curves present peaks related to the melting of distinct monolayers of ice, and we were able to calculate the work (free energy) associated with it. For a larger tip (R = 1.80 nm) having a size not commensurate with the average monolayer thickness, we did not find a clear structure in force curves. This work can help guide the interpretation of experimental AFM indentation of ice and other crystalline solids. More specifically, it provides guidelines for tip sizes where layer-by-layer melting can be achieved and for the order of magnitude of forces that need to be detected.

Original languageEnglish (US)
Pages (from-to)27118-27124
Number of pages7
JournalJournal of Physical Chemistry C
Volume119
Issue number48
DOIs
StatePublished - Nov 9 2015

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Energy(all)
  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films

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