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Metallic solids such as crystals of copper, aluminum, and iron are formed by metal atoms. The structure of metallic crystals is often described as a uniform distribution of atomic nuclei within a “sea” of delocalized electrons. The atoms within such a metallic solid are held together by a unique force known as metallic bonding that gives rise to many useful and varied bulk properties.
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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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The structure of a crystalline solid, whether a metal or not, is best described by considering its simplest repeating unit, which is referred to as its unit cell. The unit cell consists of lattice points that represent the locations of atoms or ions. The entire structure then consists of this unit cell repeating in three dimensions. The three different types of unit cells present in the cubic lattice are illustrated in Figure 1.
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Ionic crystals consist of two or more different kinds of ions that usually have different sizes. The packing of these ions into a crystal structure is more complex than the packing of metal atoms that are the same size.
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Crystalline solids are divided into four types: molecular, ionic, metallic, and covalent network based on the type of constituent units and their interparticle interactions.
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Ziegler–Natta polymerization is another form of addition or chain‐growth polymerization used for synthesizing linear polymers over branched polymers. The catalyst used for polymerization is the Ziegler–Natta catalyst, named after Karl Ziegler and Giulio Natta, who developed it in 1953. This catalyst is an organometallic complex of titanium tetrachloride and triethyl aluminum, with the active form of the catalyst being an alkyl titanium compound. Using the Ziegler–Natta...
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Las redes de Arquímedes surgen en la solidificación eutéctica dirigida por la plantilla

Ashish A Kulkarni1,2,3, Erik Hanson4, Runyu Zhang1,2,3

  • 1Department of Materials Science and Engineering, University of Illinois at Urbana-Champaign, Champaign, IL, USA.

Nature
|January 17, 2020
PubMed
Resumen
Este resumen es generado por máquina.

El ensamblaje dirigido a la plantilla creó nuevas mesostructuras eutecticas, incluidos los patrones de trébol y hexafólio, controlando las tasas de solidificación dentro de las plantillas de pilares. Estas microestructuras ordenadas tienen aplicaciones potenciales en materiales y tecnologías avanzadas.

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Área de la Ciencia:

  • Ciencias de los materiales
  • Nanotecnología
  • La cristalografía

Sus antecedentes:

  • El ensamblaje dirigido por plantilla produce mesostructuras altamente ordenadas con simetrías únicas.
  • Los materiales eutecticos son cruciales para tecnologías como palas de turbinas y aleaciones de soldadura, pero no han sido templados.
  • Los métodos de plantilla existentes carecen de aplicación a los sistemas eutécticos.

Objetivo del estudio:

  • Aplicar el ensamblaje dirigido a la plantilla a los materiales eutécticos.
  • Investigar los resultados microstruturales de la plantilla de AgCl-KCl eutéctico.
  • Explorar el potencial de las mesostructuras resultantes en aplicaciones avanzadas.

Principales métodos:

  • La solidificación direccional del eutectico AgCl-KCl dentro de una plantilla de pilares.
  • Variación de las tasas de solidificación para controlar la formación de microestructuras.
  • Utilizando simulaciones de campo de fase para comprender las restricciones de difusión.
  • Utilizando cristales coloidales de una sola capa como plantillas alternativas.

Principales resultados:

  • Aparición de nuevas microestructuras distintas de las estructuras lamelares y hexagonales nativas.
  • Realización de tres hojas, cuatro hojas, cinco hojas y hexa hojas con características sub-micrómetro.
  • Las simulaciones de campo de fase confirman las restricciones de la plantilla en la formación de la mesostructura de la unidad de difusión.
  • Observación de mesostructuras similares utilizando plantillas de cristales coloidales, incluidos los patrones de tipo kagome.

Conclusiones:

  • El ensamblaje dirigido por plantillas genera con éxito diversas mesostructuras eutecticas.
  • La plantilla de pilares hexagonales y la tasa de solidificación son clave para formar patrones complejos.
  • Las eutecticas plantilladas ofrecen vías prometedoras para metasuperficies, sistemas de hielo giratorio y redes mecánicas mejoradas.