NDLI: Wrinkle-assisted linear assembly of hard-core/soft-shell particles: impact of the soft shell on the local structure

Content Provider	Royal Society of Chemistry (RSC)
Author	Fery, Andreas Hellweg, Thomas Fortini, Andrea Müller, Mareen Karg, Matthias
Copyright Year	2012
Abstract	This article addresses wrinkle assisted assembly of core–shell particles with hard cores and soft poly-(N-isopropylacrylamide) shells. As core materials we chose silica as well as silver nanoparticles. The assembled structures show that the soft shells act as a separator between the inorganic cores. Anisotropic alignment is found on two length scales, macroscopically guided through the wrinkle structure and locally due to deformation of the polymer shell leading to smaller inter-core separations as compared to assembly on flat substrates without confinement. The structures were analysed by means of scanning electron microscopy. Radial distribution functions are shown, clearly highlighting the impact of confinement on nearest neighbour distances and symmetry. The observed ordering is directly compared to Monte-Carlo simulations for hard-core/soft-shell particles, showing that the observed symmetries are a consequence of the soft interaction potential and differ qualitatively from a hard-sphere situation. For the silver-poly-(N-isopropylacrylamide) particles, we show UV-vis absorbance measurements revealing optical anisotropy of the generated structures due to plasmon coupling. Furthermore, the high degree of order of the assembled structures on macroscopic areas is demonstrated by laser diffraction effects.
Starting Page	2491
Ending Page	2499
Page Count	9
File Format	HTM / HTML PDF
ISSN	20403364
Volume Number	4
Issue Number	7
Journal	Nanoscale
DOI	10.1039/c2nr11591c
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Monte Carlo method Ultraviolet\u2013visible spectroscopy Diffraction Wrinkle Laser Polymer Birefringence Scanning electron microscope Silicon dioxide
Content Type	Text
Resource Type	Article
Subject	Nanoscience and Nanotechnology

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