By means of extensive simulations, we investigate concentrated solutions ofglobular single-chain nanoparticles (SCNPs), an emergent class of syntheticsoft nano-objects. By increasing the concentration, the SCNPs show a reentrantbehaviour in their structural and dynamical correlations, as well as a softcaging regime and weak dynamic heterogeneity. The latter is confirmed byvalidation of the Stokes-Einstein relation up to concentrations far beyond theoverlap density. Therefore SCNPs arise as a new class of soft colloids,exhibiting slow dynamics and actualizing in a real system structural anddynamical anomalies proposed by models of ultrasoft particles. Quantitativedifferences in the dynamical behaviour depend on the SCNP deformability, whichcan be tuned through the degree of internal cross-linking.
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