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Aldol condensation is an acid or base-catalyzed condensation between aldehydes or ketones to give an α,ꞵ-unsaturated carbonyl compound. A base-promoted condensation between ester molecules to produce a ꞵ-ketoester is known as the Claisen condensation. In the presence of a base, both reactions involve deprotonation of the acidic α hydrogen to produce the corresponding enolates. The nucleophilic enolates attack their respective nonenolized carbonyl compound forming a tetrahedral...
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The physical form of a substance changes on changing its temperature. For example, raising the temperature of a liquid causes the liquid to vaporize (convert into vapor). The process is called vaporization—a surface phenomenon. Vaporization occurs when the thermal motion of the molecules overcome the intermolecular forces, and the molecules (at the surface) escape into the gaseous state. When a liquid vaporizes in a closed container, gas molecules cannot escape. As these gas phase molecules...
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The Knoevenagel condensation is an aldol-type reaction involving the condensation of aldehydes or ketones with active methylene compounds such as β-diesters to produce substituted olefins.
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Aldol condensation is an important route in synthetic organic chemistry used to generate a new carbon–carbon bond under basic or acidic conditions. The aldol condensation reaction presented in Figure 1 constitutes an aldol addition reaction followed by the dehydration process.
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Regular Claisen condensation involves the synthesis of β-ketoesters by combining identical ester molecules bearing two α hydrogens in the presence of an alkoxide base. The reaction commences with the deprotonation of the acidic α hydrogen by the base to form a resonance stabilized ester enolate. This nucleophilic ion then attacks the carbonyl center of another ester molecule to generate a tetrahedral alkoxide intermediate. Next, the expulsion of the alkoxide group from the...
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Micro 3D Printing Using a Digital Projector and its Application in the Study of Soft Materials Mechanics
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Condensador de campo oscuro micro-óptico impreso en 3D

Robert Horvat, Leander Siegle, Luca Schmid

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

    Los investigadores desarrollaron un condensador de campo oscuro compacto e impreso en 3D para microscopía. Este dispositivo miniaturizado mejora el contraste y la resolución de la imagen para muestras a nanoescala, permitiendo imágenes avanzadas en biología y medicina.

    Palabras clave:
    microscopía de campo oscuroimpresión 3Dmicro-ópticananotecnologíaprototipado rápido

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    Área de la Ciencia:

    • Microscopía óptica
    • Nanotecnología
    • Impresión 3D

    Sus antecedentes:

    • La microscopía de campo oscuro es crucial para la obtención de imágenes de alto contraste de muestras transparentes y a nanoescala.
    • Las configuraciones convencionales de microscopía de campo oscuro suelen ser voluminosas y costosas.
    • La miniaturización es clave para una mayor accesibilidad en la investigación científica.

    Objetivo del estudio:

    • Demostrar un condensador de campo oscuro miniaturizado e impreso en 3D.
    • Lograr imágenes de campo oscuro de alto rendimiento con un dispositivo compacto.
    • Permitir el prototipado rápido de técnicas avanzadas de microscopía.

    Principales métodos:

    • Fabricación de un condensador de campo oscuro de tamaño milimétrico mediante impresión 3D de polimerización de dos fotones con femtosegundo.
    • Integración de una apertura absorbente anular y una lente de alta apertura numérica en un sustrato de vidrio.
    • Utilización de iluminación oblicua para imágenes de campo oscuro.

    Principales resultados:

    • Demostración exitosa de un excelente rendimiento en campo oscuro.
    • Imágenes de gráficos de prueba de resolución USAF 1951.
    • Se logró una resolución de discos de oro con diámetros inferiores a 500 nm.

    Conclusiones:

    • El condensador de campo oscuro impreso en 3D ofrece una solución miniaturizada y eficaz para la microscopía avanzada.
    • Esta tecnología permite el prototipado rápido para aplicaciones en medicina y biología, como chips microfluídicos.
    • Abre el camino a microscopios completamente impresos en 3D con capacidades de campo oscuro mejoradas.