Document Detail


On the Phase Behavior of Binary Mixtures of Nanoparticles.
MedLine Citation:
PMID:  23281700     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
The assembly of mixtures of nanoparticles with different properties into a binary nanoparticle superlattice (BNSL) provides a route to fabricate novel classes of materials with properties emerging from the choice of the building blocks. The common theoretical approach based on the hard-spheres model predicts crystallization of only a few metastable binary superstructures (NaCl, AlB2 or the $AB13. Recently [Nature 439, 55 (2006)], it has been demonstrated that using a combination of semiconducting, metallic and magnetic nanoparticles, a variety of novel BNSL structures were formed, where at least $10$ were low density structures that have not been reported before. While some of the structures can be explained by adding electrostatic interactions, it is clear that at the nanometer scale one needs to consider other influences, such as van der Waals forces, steric effects, etc. Motivated by those experiments we study, using Monte Carlo simulations, the phase behavior of binary mixtures of nanoparticles interacting via a combination of hard-core, electrostatics and van der Waals forces. We include a tuning parameter that can be used to balance between electrostatic and dispersion interactions and study the phase behavior as a function of the different charge and size ratio of the nanoparticles. The results indicate that for nanoparticles, both electrostatic and dispersion interactions are necessary to explain the experimental observed BNSL structures.
Authors:
Avi Ben-Simon; Hagai Eshet; Eran Rabani
Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2013-1-2
Journal Detail:
Title:  ACS nano     Volume:  -     ISSN:  1936-086X     ISO Abbreviation:  ACS Nano     Publication Date:  2013 Jan 
Date Detail:
Created Date:  2013-1-3     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  101313589     Medline TA:  ACS Nano     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
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