Evidence for Enhanced Tracer Diffusion in Densely Packed Interfacial Assemblies of Hairy Nanoparticles.
Nano Lett
; 23(22): 10383-10390, 2023 Nov 22.
Article
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| MEDLINE
| ID: mdl-37955362
ABSTRACT
Nearly monodisperse nanoparticle (NP) spheres attached to a nonvolatile ionic liquid surface were tracked by in situ scanning electron microscopy to obtain the tracer diffusion coefficient Dtr as a function of the areal fraction Ï. The in situ technique resolved both tracer (gold) and background (silica) particles for â¼1-2 min, highlighting their mechanisms of diffusion, which were strongly dependent on Ï. Structure and dynamics at low and moderate Ï paralleled those reported for larger colloidal spheres, showing an increase in order and a decrease in Dtr by over 4 orders of magnitude. However, ligand interactions were more important near jamming, leading to different caging and jamming dynamics for smaller NPs. The normalized Dtr at ultrahigh Ï depended on particle diameter and ligand molecular weight. Increasing the PEG molecular weight by a factor of 4 increased Dtr by 2 orders of magnitude at ultrahigh Ï, indicating stronger ligand lubrication for smaller particles.
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Colección:
01-internacional
Banco de datos:
MEDLINE
Idioma:
En
Revista:
Nano Lett
Año:
2023
Tipo del documento:
Article
País de afiliación:
Estados Unidos