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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...
Polymer Classification: Crystallinity01:21

Polymer Classification: Crystallinity

Unlike ionic or small covalent molecules, polymers do not form crystalline solids due to the diffusion limitations of their long-chain structures. However, polymers contain microscopic crystalline domains separated by amorphous domains.
Crystalline domains are the regions where polymer chains are aligned in an orderly manner and held together in proximity by intermolecular forces. For example, chains in the crystalline domains of polyethylene and nylon are bound together by van der Waals...
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...
Determination of Crystal Structures01:29

Determination of Crystal Structures

In the late 1800s, the revelation that light extended beyond visible wavelengths led to the discovery of X-rays by Wilhelm Roentgen. Recognized as high-energy electromagnetic radiation with short wavelengths, X-rays prompted exploration into their interaction with crystals. Max von Laue proposed in 1912 that the periodic arrangement of atoms, ions, or molecules in crystals would cause them to diffract X-rays, a hypothesis confirmed through experiments with copper sulfate and zinc sulfide...
Crystal Density01:19

Crystal Density

The crystal lattice structure of a material allows us to determine how many molecules exist in its unit cell. With this information, alongside the unit-cell parameters - three distance parameters (a, b, c) and three angular parameters (α, β, γ).Density (ρ) = (Z × M) / (a × b × c × NA)where:Z is the number of formula units per unit cellM is the molar mass of the substancea, b, and c are the edge lengths of the unit cellNA is Avogadro’s numberFor a simple cubic lattice, atoms are located only at...

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Video Experimental Relacionado

Updated: Jul 12, 2026

Probing C84-embedded Si Substrate Using Scanning Probe Microscopy and Molecular Dynamics
13:58

Probing C84-embedded Si Substrate Using Scanning Probe Microscopy and Molecular Dynamics

Published on: September 28, 2016

Métodos de simulación por computadora en el estudio de materiales no cristalinos.

F Yonezawa

    Science (New York, N.Y.)
    |April 30, 1993
    PubMed
    Resumen

    Las simulaciones por computadora ofrecen un poderoso tercer enfoque en física, complementando los métodos experimentales y teóricos. Estas simulaciones numéricas son cruciales para comprender los materiales no cristalinos como los líquidos y los vidrios.

    Área de la Ciencia:

    • Física Física es la física de las cosas.
    • Ciencia de los materiales Ciencia de los materiales.
    • Ciencias computacionales Ciencias computacionales.

    Sus antecedentes:

    • La física experimental y teórica son enfoques tradicionales.
    • La física asistida por computadora emerge como un tercer pilar significativo.
    • Los materiales no cristalinos presentan desafíos únicos para el estudio.

    Objetivo del estudio:

    • Para resaltar el papel de las simulaciones por ordenador en la física.
    • Para discutir la aplicación de simulaciones numéricas a los materiales no cristalinos.
    • Explorar la utilidad de los métodos computacionales en la ciencia de los materiales.

    Principales métodos:

    • Simulaciones numéricas de simulaciones.
    • Modelado por computadora para el modelado por computadora.

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    Methods of Ex Situ and In Situ Investigations of Structural Transformations: The Case of Crystallization of Metallic Glasses
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  • Las técnicas de la física computacional son técnicas de la física computacional.

    • Principales resultados:

    • Las simulaciones por computadora proporcionan información valiosa sobre los materiales no cristalinos.
    • Se demuestran las aplicaciones en líquidos, vidrios, sólidos amorfos y cristales líquidos.
    • Se muestra la efectividad de los enfoques computacionales.

    Conclusiones:

    • La física asistida por computadora es un paradigma de investigación vital.
    • Las simulaciones numéricas son indispensables para el estudio de materiales complejos.
    • Las aplicaciones discutidas muestran el potencial de la física computacional.