study their structural and dynamical properties, and the
interaction with solvent (water, counterions). Both the cationic
and anionic AuNPs were simulated over an extensive period of
200 ns, allowing us to compare the two cases on equal footing
and without considerable concerns of sufficient sampling. The
nanoparticle composition corresponds to one of the most
ubiquitous synthesized AuNP sizes (29 kDa, core diameter ∼2
nm), matching also its mass-spectrometrical analysis for
Au144(SR)60.43−46 Also, the AuNP structure incorporates the
common structural details reported for several cluster sizes in
this size regime (d ≤ 2 nm).3,47−50 The structural model of
Au144(SR)60 is based on the recent theoretical model by Lopez-
Acevedo et al.51 which was shown to be in very good agreement
with the experimental X-ray powder diffraction measurements,
52 and the AuNP electronic structure is consistent with
the chemical voltammetry measurements and optical properties.
4
study their structural and dynamical properties, and theinteraction with solvent (water, counterions). Both the cationicand anionic AuNPs were simulated over an extensive period of200 ns, allowing us to compare the two cases on equal footingand without considerable concerns of sufficient sampling. Thenanoparticle composition corresponds to one of the mostubiquitous synthesized AuNP sizes (29 kDa, core diameter ∼2nm), matching also its mass-spectrometrical analysis forAu144(SR)60.43−46 Also, the AuNP structure incorporates thecommon structural details reported for several cluster sizes inthis size regime (d ≤ 2 nm).3,47−50 The structural model ofAu144(SR)60 is based on the recent theoretical model by Lopez-Acevedo et al.51 which was shown to be in very good agreementwith the experimental X-ray powder diffraction measurements,52 and the AuNP electronic structure is consistent withthe chemical voltammetry measurements and optical properties.4
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