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Whether solid, liquid, or gas, a substance's state depends on the order and arrangement of its particles (atoms, molecules, or ions). Particles in the solid pack closely together, generally in a pattern. The particles vibrate about their fixed positions but do not move or squeeze past their neighbors. In liquids, although the particles are closely spaced, they are randomly arranged. The position of the particles are not fixed—that is, they are free to move past their neighbors to...
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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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Color in Coordination Complexes
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human...
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A reversible chemical reaction represents a chemical process that proceeds in both forward (left to right) and reverse (right to left) directions. When the rates of the forward and reverse reactions are equal, the concentrations of the reactant and product species remain constant over time and the system is at equilibrium. A special double arrow is used to emphasize the reversible nature of the reaction. The relative concentrations of reactants and products in equilibrium systems vary greatly;...
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Color perception begins in the retina, the light-sensitive layer at the back of the eye. Two main theories explain how colors are seen: the trichromatic theory and the opponent-process theory. The trichromatic theory, proposed by Thomas Young in 1802 and extended by Hermann von Helmholtz in 1852, suggests that color vision is based on three types of cone receptors in the retina. These cones are sensitive to different but overlapping ranges of wavelengths corresponding to red, blue, and green.
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When the fitness of a trait is influenced by how common it is (i.e., its frequency) relative to different traits within a population, this is referred to as frequency-dependent selection. Frequency-dependent selection may occur between species or within a single species. This type of selection can either be positive—with more common phenotypes having higher fitness—or negative, with rarer phenotypes conferring increased fitness.
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Colores estructurales dinámicos de baja dependencia angular habilitados por material de cambio de fase Sb2S3

Haotong Wang, Min Lu, Xiaotan Ji

    Optics letters
    |February 13, 2026
    PubMed
    Resumen
    Este resumen es generado por máquina.

    Este estudio presenta una novedosa estructura de cavidad de cinco capas que utiliza material de cambio de fase de sulfuro de antimonio (Sb2S3) para lograr colores estructurales sintonizables con baja dependencia angular, prometedor para pantallas avanzadas.

    Palabras clave:
    colores estructuralesmaterial de cambio de fasesulfuro de antimonioóptica de película delgadapantallasdependencia angular

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    Área de la Ciencia:

    • Óptica y Fotónica
    • Ciencia de Materiales

    Sus antecedentes:

    • El color estructural dinámico es crucial para las tecnologías de visualización avanzadas.
    • La dependencia angular sigue siendo un desafío importante en los sistemas actuales de color estructural.

    Objetivo del estudio:

    • Desarrollar colores estructurales sintonizables con alta pureza y baja dependencia angular.
    • Utilizar materiales de cambio de fase para la generación dinámica de color.

    Principales métodos:

    • Fabricación de una estructura de cavidad asimétrica de Fabry-Pérot de cinco capas.
    • Incorporación de sulfuro de antimonio (Sb2S3) como material de cambio de fase.
    • Caracterización de las propiedades del color estructural bajo ángulos de incidencia y fases de material variables.

    Principales resultados:

    • Se lograron colores estructurales de alta pureza (>90%) en rojo, naranja y amarillo.
    • Se demostró un desplazamiento espectral mínimo (<10 nm) en un ángulo de incidencia de 60°.
    • Se sintonizaron con éxito los colores alterando la fase de Sb2S3 (amorfa a cristalina), produciendo negro, marrón y naranja.

    Conclusiones:

    • La estructura propuesta ofrece un diseño simple para colores estructurales sintonizables de alto rendimiento.
    • El sistema basado en Sb2S3 muestra un potencial significativo para la tecnología de visualización y las aplicaciones de lucha contra la falsificación.