Journal
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
Volume 134, Issue 45, Pages 18732-18738Publisher
AMER CHEMICAL SOC
DOI: 10.1021/ja307848h
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Funding
- MRSEC program of the National Science Foundation [DMR-0213574]
- NSEC program of the NSF [CHE-0641523]
- EFRC program of DoE [DE-SC0001085]
- New York State Office of Science, Technology, and Academic Research
- U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences [DE-AC02-98CH10886]
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The kinetics and intricate interactions governing the growth of 3D single nanoparticle (NP) superlattices (SLs, SNSLs) and binary NP SLs (BNSLs) in solution are understood, by combining controlled solvent evaporation and in situ, real: time small-angle X-ray scattering (SAXS) For the iron oxide (magnetite) NP SLs studied here, the larger the NP, the farther apart are the NPs when the SNSLs begin to precipitate and the closer they are after ordering. This is explained by a model of NP assembly using van der Waals interactions between magnetite cores in hydrocarbons with a similar to 21 zJ Hamaker constant. When forming BNSLs of two different sized NPs, the NPs that are in excess of that needed to achieve the final BNSL stoichiometry are expelled during the BNSL formation, and these expelled NPs can form SNSLs. The long-range ordering of these SNSLs and the BNSLs can occur faster than the NP expulsion.
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