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29 March 2024
 
  » arxiv » 2004.5919

 Article overview


Block copolymer-nanorod co-assembly in thin films: effects of rod-rod interaction and confinement
Javier Diaz ; Marco Pinna ; Andrei V. Zvelindovsky ; Ignacio Pagonabarraga ; Roy Shenhar ;
Date 13 Apr 2020
AbstractSimulations and experiments of nanorods (NRs) show that co-assembly with block copolymer (BCP) melts leads to the formation of a superstructure of side-to-side NRs perpendicular to the lamellar axis. A mesoscopic model is validated against scanning electron microscopy (SEM) images of CdSe NRs mixed with polystyrene-block-poly(methyl methacrylate). It is then used to study the co-assembly of anisotropic nanoparticles (NPs) with a length in the same order of magnitude as the lamellar spacing. The phase diagram of BCP/NP is explored as well as the time evolution of the NR. NRs that are slightly larger than the lamellar spacing are found to rotate and organise side-to-side with a tilted orientation with respect to the interface. Strongly interacting NPs are found to dominate the co-assembly while weakly interacting nanoparticles are less prone to form aggregates and tend to form well-ordered configurations.
Source arXiv, 2004.5919
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