title: Can Point Defects in Surfaces in Solution be Atomically Resolved by Atomic Force Microscopy?
abstract: While the atomic force microscope (AFM) is able to image mineral surfaces in solution with atomic resolution, so far, it has been a matter of debate whether imaging point defects is also possible under these conditions. The difficulties stem from the limited knowledge of what types of defects may be stable in the presence of an AFM tip, as well as from the complicated imaging mechanism involving interactions between hydration layers over the surface and around the tip apex. Here, we present atomistic molecular dynamics and free energy calculations of the AFM imaging of vacancies and ionic substitutions in the calcite (101[over ¯]4) surface in water, using a new silica AFM tip model. Our results indicate that both calcium and carbonate vacancies, as well as a magnesium substitution, could be resolved in an AFM experiment, albeit with different imaging mechanisms.
authors.affiliation: Curtin Institute for Computation and Department of Chemistry, Curtin University, GPO Box U1987, Perth, Western Australia 6845, Australia.
authors.forename: Bernhard
authors.initials: B
authors.lastname: Reischl
authors.affiliation: Curtin Institute for Computation and Department of Chemistry, Curtin University, GPO Box U1987, Perth, Western Australia 6845, Australia.
authors.forename: Paolo
authors.initials: P
authors.lastname: Raiteri
authors.affiliation: Curtin Institute for Computation and Department of Chemistry, Curtin University, GPO Box U1987, Perth, Western Australia 6845, Australia.
authors.forename: Julian D
authors.initials: JD
authors.lastname: Gale
authors.affiliation: Curtin Institute for Computation and Department of Chemistry, Curtin University, GPO Box U1987, Perth, Western Australia 6845, Australia.
authors.forename: Andrew L
authors.initials: AL
authors.lastname: Rohl