Entropy-Driven Assembly of Nanoparticles within Emulsion-Evaporative Block Copolymer Particle: Crusted, Seeded, and Alternate Layered Onions

Title
Entropy-Driven Assembly of Nanoparticles within Emulsion-Evaporative Block Copolymer Particle: Crusted, Seeded, and Alternate Layered Onions
Authors
장세규허몽구강희이영준신재만김은지윤홍석김범준
Keywords
block copolymer; nanoparticle; hexagonal packing; sphere; morphology transition
Issue Date
2020-08
Publisher
Chemistry of materials
Citation
VOL 32, NO 16-7043
Abstract
Hybrid organic/inorganic systems with modulated nanostructures and well-defined morphologies are of great importance to develop novel nanomaterials with tailored functionalities. Herein, we report the tunable assemblies of polystyrene-grafted Au nanoparticles (Au@PS NPs) within onion-like particles of polystyrene-b-poly(4-vinylpyridine) (PS-b-P4VP), controlled by the molecular weight (Mn) of PS ligands. Coassembly of Au@PS and PS-b-P4VP through solvent-evaporative emulsions exhibits dramatic morphological changes in the NP assemblies depending on the Mn of PS ligands: (1) addition of low Mn (1.8 kg mol?1) Au@PS creates crusted onion-like hybrid particles with well-ordered hexagonal NP superlattices covering their surface; (2) in contrast, high Mn (6.4 kg mol?1) Au@PS segregate at PS domains of the block copolymer particles. Interestingly, these NPs form a hexagonal packing structure at the center of the PS domains, producing concentric lamellar particles with hierarchically stacked Au@PS in an alternate-layered onion-like structure. Finally, cryogenic electron microscopy analysis is conducted to probe the entropy-driven mechanism of the formation of these hybrid particles. These initial demonstrations of multicomponent hybrid particles with targeted spatial alignments offer new strategies to design complex nanomaterials with tailorable properties for potential technological applications.
URI
http://pubs.kist.re.kr/handle/201004/72038
ISSN
0897-4756
Appears in Collections:
KIST Publication > Article
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