Journal
SMALL
Volume 18, Issue 22, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/smll.202106768
Keywords
anisotropic nanoparticles; small angle X-ray scattering; superlattice transformation; time-dependent measurements
Categories
Funding
- Swedish Research Council (VR) [2018-06378, 2019-05624]
- Postdoctoral Researcher funding of Academy of Finland [330214]
- New National Excellence Program Hungarian Ministry of Human Capacities [UNKP-21-5]
- Janos Bolyai Research Scholarship of the Hungarian Academy of Sciences
- EU [730872]
- NSF [DMR-0520547]
- European Union [654000]
- Academy of Finland (AKA) [330214, 330214] Funding Source: Academy of Finland (AKA)
- Swedish Research Council [2019-05624, 2018-06378] Funding Source: Swedish Research Council
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In this study, structural transformations and lattice expansion of oleate-capped iron oxide nanocube superlattices during solvent removal were investigated. The combination of COSMO-RS theory and CFD modeling provided information on solvent composition and polarity during droplet evaporation. It was found that the presence of a sufficient amount of added oleic acid and an increase in polarity as the poor solvent is enriched are both necessary to promote the formation of structurally diverse superlattices with large domain sizes.
Structural transformations and lattice expansion of oleate-capped iron oxide nanocube superlattices are studied by time-resolved small-angle X-ray scattering (SAXS) during solvent removal. The combination of conductor-like screening model for real solvents (COSMO-RS) theory with computational fluid dynamics (CFD) modeling provides information on the solvent composition and polarity during droplet evaporation. Evaporation-driven poor-solvent enrichment in the presence of free oleic acid results in the formation of superlattices with a tilted face-centered cubic (fcc) structure when the polarity reaches its maximum. The tilted fcc lattice expands subsequently during the removal of the poor solvent and eventually transforms to a regular simple cubic (sc) lattice during the final evaporation stage when only free oleic acid remains. Comparative studies show that both the increase in polarity as the poor solvent is enriched and the presence of a sufficient amount of added oleic acid is required to promote the formation of structurally diverse superlattices with large domain sizes.
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