期刊
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
卷 134, 期 34, 页码 14043-14049出版社
AMER CHEMICAL SOC
DOI: 10.1021/ja304108n
关键词
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资金
- NSF [DMR-0731382]
- S3IP center at SUNY Binghamton
- National Science Foundation
- National Institutes of Health/National Institute of General Medical Sciences under NSF award [DMR-0936384]
We report a Kirkwood-Alder transition in a system of nonspherical Pt3Cu2 nanoctahedra coated with oleic acid and oleylamine ligands. Using both transmission electron microscopy tomography with 3D reconstruction analysis and synchrotron-based in-situ grazing-incidence small-angle X-ray scattering (GISAXS) techniques, we specifically determined that these nanoctahedra can assemble into an open structure in which the nanoctahedra are arranged tip-to-tip to form a bcc superlattice with a low packing efficiency. Using in-situ and real-time GISAXS, we further observed a nanoctahedron crystallization as a soft Kirkwood-Alder transition, that is, the soft nanoactahedra crystallize at a critical concentration and possess continuous crystalline states during a period of solvent evaporation. Finally, we found a reversible change of the superlattice constant during the solvent annealing and evaporation/drying processes.
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