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Videos de Conceptos Relacionados

Structures of Solids02:22

Structures of Solids

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...
Metallic Solids02:37

Metallic Solids

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.
All metallic solids exhibit high thermal and electrical conductivity, metallic luster, and malleability. Many...
Network Covalent Solids02:18

Network Covalent Solids

Network covalent solids contain a three-dimensional network of covalently bonded atoms as found in the crystal structures of nonmetals like diamond, graphite, silicon, and some covalent compounds, such as silicon dioxide (sand) and silicon carbide (carborundum, the abrasive on sandpaper). Many minerals have networks of covalent bonds.
To break or to melt a covalent network solid, covalent bonds must be broken. Because covalent bonds are relatively strong, covalent network solids are typically...
Lattice Centering and Coordination Number02:33

Lattice Centering and Coordination Number

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.
Types of Unit Cells
Imagine taking a large number of identical...
Unit Cells01:18

Unit Cells

A crystal's internal structure is an orderly array of atoms, ions, or molecules, and the details of this array significantly influence the solid's properties. In a crystal, periodically repeating 'structural motifs' - which could be atoms, molecules, or groups thereof - create a 'space lattice.' This is essentially a three-dimensional, infinite array of points, each surrounded by its neighbors in an identical way, forming the basic structure of the crystal.A 'unit cell' is a theoretical...
Bonding and Strength of Aggregate01:12

Bonding and Strength of Aggregate

The bond between aggregate particles and the cement matrix is significantly influenced by the shape and surface texture of the aggregates. High-strength concretes benefit from a rougher texture, which leads to stronger bonding due to greater adhesion. Angular aggregates with larger surface areas also enhance this bond. The bonding quality, however, is complex to assess as no universally accepted test exists. Good bonding is indicated when a crushed concrete specimen shows some aggregate...

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Los copolímeros de bloque bajo confinamiento tridimensional periódico y fuerte.

André C Arsenault1, David A Rider, Nicolas Tétreault

  • 1Department of Chemistry, University of Toronto, Toronto, Ontario M5S 3H6, Canada.

Journal of the American Chemical Society
|July 14, 2005
PubMed
Resumen

El fuerte confinamiento 3D influye en el autoensamblaje del copolímero diblock utilizando plantillas de sílice. Esto conduce a morfologías únicas como conchas concéntricas y lámelas ramificadas en metalopolímeros de poliferrocenilsilano.

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Área de la Ciencia:

  • Ciencia de los materiales Ciencia de los materiales.
  • Química de Polímeros La Química de Polímeros es la química de los polímeros.
  • Nanotecnología La nanotecnología es la nanotecnología.

Sus antecedentes:

  • Los copolímeros Diblock se autoensamblan en nanoestructuras ordenadas.
  • Los metalopolímeros ofrecen propiedades únicas debido a la incorporación de metales.
  • El confinamiento 3D puede alterar las vías de autoensamblaje.

Objetivo del estudio:

  • Investigar el efecto de un fuerte confinamiento 3D en el autoensamblaje del copolímero diblock.
  • Explorar el uso de cristales coloidales de sílice y cristales coloidales inversos como plantillas.
  • Analizar las morfologías resultantes de los copolímeros diblock que contienen poliferrocenilsilano.

Principales métodos:

  • Utilizó cristales coloidales de sílice y cristales coloidales inversos como moldes a escala nanométrica.
  • Dirigió el autoensamblaje de copolímeros diblock con un segmento de poliferrocenilsilano.
  • Caracterizó las morfologías autoensambladas utilizando microscopía electrónica y otras técnicas.

Principales resultados:

  • Se observó una influencia significativa del confinamiento 3D en el autoensamblaje.
  • Generó morfologías inusuales que incluyen conchas concéntricas y lámelas ramificadas.
  • Demostró el papel de las plantillas de alta superficie y topológicamente periódicas en la dirección del ensamblaje.

Conclusiones:

  • El fuerte confinamiento 3D altera fundamentalmente el autoensamblaje del copolímero diblock.
  • Las plantillas de sílice permiten la formación de nanoestructuras complejas y no convencionales.
  • Los metalopolímeros de poliferrocenilsilano exhiben respuestas únicas al confinamiento topológico.