Nanoparticle Interactions Guided by Shape-Dependent Hydrophobic Forces.

Autor: Tan SF; Department of Physics, National University of Singapore, Singapore, 117551, Singapore.; Centre for BioImaging Sciences and Department of Biological Sciences, National University of Singapore, Singapore, 117557, Singapore.; Centre for Advanced 2D Materials and Graphene Research Centre, National University of Singapore, Singapore, 117546, Singapore., Raj S; Department of Chemistry, University of Illinois at Chicago, Chicago, IL, 60607, USA., Bisht G; Department of Physics, National University of Singapore, Singapore, 117551, Singapore.; Centre for BioImaging Sciences and Department of Biological Sciences, National University of Singapore, Singapore, 117557, Singapore., Annadata HV; Department of Chemistry, National University of Singapore, Singapore, 117543, Singapore., Nijhuis CA; Centre for Advanced 2D Materials and Graphene Research Centre, National University of Singapore, Singapore, 117546, Singapore.; Department of Chemistry, National University of Singapore, Singapore, 117543, Singapore.; NUSNNI-NanoCore, National University of Singapore, Singapore, 117411, Singapore., Král P; Department of Chemistry, University of Illinois at Chicago, Chicago, IL, 60607, USA.; Departments of Physics and Biopharmaceutical Sciences, University of Illinois at Chicago, Chicago, IL, 60607, USA., Mirsaidov U; Department of Physics, National University of Singapore, Singapore, 117551, Singapore.; Centre for BioImaging Sciences and Department of Biological Sciences, National University of Singapore, Singapore, 117557, Singapore.; Centre for Advanced 2D Materials and Graphene Research Centre, National University of Singapore, Singapore, 117546, Singapore.; NUSNNI-NanoCore, National University of Singapore, Singapore, 117411, Singapore.
Jazyk: angličtina
Zdroj: Advanced materials (Deerfield Beach, Fla.) [Adv Mater] 2018 Apr; Vol. 30 (16), pp. e1707077. Date of Electronic Publication: 2018 Mar 14.
DOI: 10.1002/adma.201707077
Abstrakt: Self-assembly of solvated nanoparticles (NPs) is governed by numerous competing interactions. However, relatively little is known about the time-dependent mechanisms through which these interactions enable and guide the nanoparticle self-assembly process. Here, using in situ transmission electron microscopy imaging combined with atomistic modeling, it is shown that the forces governing the self-assembly of hydrophobic nanoparticles change with the nanoparticle shapes. By comparing how gold nanospheres, nanocubes, nanorods, and nanobipyramids assemble, it is shown that the strength of the hydrophobic interactions depends on the overlap of the hydrophobic regions of the interacting nanoparticle surfaces determined by the nanoparticle shapes. Specifically, this study reveals that, in contrast to spherical nanoparticles, where van der Waals forces play an important role, hydrophobic interactions can be more relevant for nanocubes with flat side faces, where an oriented attachment between the nanocubes is promoted by these interactions. The attachment of nanocubes is observed to proceed in two distinct pathways: nanocubes either: (i) prealign their faces before the attachment, or (ii) first connect through a misaligned (edge-to-edge) attachment, followed by a postattachment alignment of their faces. These results have important implications for understanding the interaction dynamics of NPs and provide the framework for the design of future self-assembled nanomaterials.
(© 2018 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.)
Databáze: MEDLINE
Externí odkaz: