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Related Concept Videos

Phase Diagrams02:39

Phase Diagrams

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A phase diagram combines plots of pressure versus temperature for the liquid-gas, solid-liquid, and solid-gas phase-transition equilibria of a substance. These diagrams indicate the physical states that exist under specific conditions of pressure and temperature and also provide the pressure dependence of the phase-transition temperatures (melting points, sublimation points, boiling points). Regions or areas labeled solid, liquid, and gas represent single phases, while lines or curves represent...
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Molecules have characteristic shapes that are crucial for their function. The arrangement of various electron groups around the central atom dictates their molecular geometry. Electron pairs in the valence shell of a central atom will adopt an arrangement that minimizes repulsions between the electron pairs by maximizing the distance between them. The valence electrons form either bonding pairs, located primarily between bonded atoms, or lone pairs.
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Solids in which the atoms, ions, or molecules are arranged in a definite repeating pattern are known as crystalline solids. Metals and ionic compounds typically form ordered, crystalline solids. A crystalline solid has a precise melting temperature because each atom or molecule of the same type is held in place with the same forces or energy. Amorphous solids or non-crystalline solids (or, sometimes, glasses) which lack an ordered internal structure and are randomly arranged. Substances that...
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Fabrication of Spherical and Worm-shaped Micellar Nanocrystals by Combining Electrospray, Self-assembly, and Solvent-based Structure Control
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A Shape-Induced Orientation Phase within 3D Nanocrystal Solids.

Max Burian1,2, Carina Karner3, Maksym Yarema4

  • 1Institute of Physics, Montanuniversitaet Leoben, 8700, Leoben, Austria.

Advanced Materials (Deerfield Beach, Fla.)
|June 27, 2018
PubMed
Summary
This summary is machine-generated.

Researchers created ordered bismuth (Bi) nanocrystal supercrystals using a diffusion-controlled self-assembly process. This method precisely controls nanocrystal alignment, enhancing electronic and optical properties for functional nanomaterials.

Keywords:
MC-simulationcolloidal nanocrystalsin situ SAXSself-assemblysupercrystal

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Crystallography

Background:

  • Nanocrystals self-assemble into superstructures, forming functional solids.
  • Properties of these solids depend on nanocrystal order (positional and orientational).

Purpose of the Study:

  • Investigate the formation of free-standing supercrystals from bismuth (Bi) nanocrystals.
  • Determine factors controlling supercrystal structure and alignment.

Main Methods:

  • In situ synchrotron X-ray scattering to probe self-assembly.
  • Nonsolvent-induced diffusion for self-assembly.
  • Monte Carlo simulations for structural analysis.

Main Results:

  • Diffusion gradient controls supercrystal structure and substrate alignment.
  • Confirmed positional order within superstructures.
  • Identified a unique orientation phase with 6 global orientations based on facet-to-facet alignment.

Conclusions:

  • Facet-to-facet alignment is crucial for optimized electronic and optical properties.
  • Controlled self-assembly yields functional nanocrystal solids with enhanced properties.