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Videos de Conceptos Relacionados

Radical Formation: Addition00:47

Radical Formation: Addition

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Radicals can be formed by adding a radical to a spin-paired molecule. This is typically observed with unsaturated species, where the addition of a radical across the π bond leads to the production of a new radical by dissolving the π bond. For example, the addition of a Br radical to an alkene yields a carbon-centered radical.
Similar to charge conservation in chemical reactions, spin conservation is implicit for radical reactions. Accordingly, the product formed must possess an...
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Phase Transitions02:31

Phase Transitions

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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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Properties of Transition Metals02:58

Properties of Transition Metals

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Transition metals are defined as those elements that have partially filled d orbitals. As shown in Figure 1, the d-block elements in groups 3–12 are transition elements. The f-block elements, also called inner transition metals (the lanthanides and actinides), also meet this criterion because the d orbital is partially occupied before the f orbitals.
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Conjugate Addition (1,4-Addition) vs Direct Addition (1,2-Addition)01:27

Conjugate Addition (1,4-Addition) vs Direct Addition (1,2-Addition)

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α,β-Unsaturated carbonyl compounds with two electrophilic sites, the carbonyl carbon, and the β carbon, are susceptible to nucleophilic attack via two modes: conjugate or 1,4-addition and direct or 1,2-addition.
Conjugate addition results in a thermodynamically stable product. The reaction retains the stronger C=O bond at the expense of the weaker C=C π bond. The process is slow as the β carbon is less electrophilic than the carbonyl carbon.
Direct addition products are...
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Phase Transitions: Vaporization and Condensation02:39

Phase Transitions: Vaporization and Condensation

21.0K
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...
21.0K
Cooperative Allosteric Transitions01:58

Cooperative Allosteric Transitions

8.7K
Cooperative allosteric transitions can occur in multimeric proteins, where each subunit of the protein has its own ligand-binding site. When a ligand binds to any of these subunits, it triggers a conformational change that affects the binding sites in the other subunits; this can change the affinity of the other sites for their respective ligands. The ability of the protein to change the shape of its binding site is attributed to the presence of a mix of flexible and stable segments in the...
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Additive Manufacturing of Functionally Graded Ceramic Materials by Stereolithography
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Comportamiento de Transición en la Fabricación Aditiva a Gran Escala de Materiales Mezclados

James Brackett1, Elijah Charles2, Matthew Charles2

  • 1The Bredesen Center for Interdisciplinary Research, University of Tennessee, Knoxville, TN 37996, USA.

Polymers
|January 28, 2026
PubMed
Resumen
Este resumen es generado por máquina.

La Fabricación Aditiva a Gran Escala (LFAM) ahora puede crear transiciones de materiales graduados utilizando un novedoso sistema de doble tolva en la plataforma Big Area Additive Manufacturing (BAAM). Este avance mejora la impresión 3D de compuestos al mejorar los límites de los materiales y reducir las fallas por delaminación.

Palabras clave:
Fabricación Aditivagran formatomultimaterialcompuestos termoplásticos

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Área de la Ciencia:

  • Ciencia de Materiales
  • Ingeniería de Fabricación
  • Fabricación Aditiva

Sus antecedentes:

  • La fabricación aditiva a gran escala (LFAM) permite la impresión 3D a escala de varios metros de compuestos utilizando material de alimentación peletizado.
  • Las técnicas multimaterial (MM) existentes en LFAM a menudo conducen a límites de material débiles y delaminación.
  • El sistema Big Area Additive Manufacturing (BAAM) es una plataforma clave de LFAM para aplicaciones industriales.

Objetivo del estudio:

  • Desarrollar e investigar una novedosa configuración de doble tolva para el sistema BAAM para permitir el cambio de material in situ.
  • Estudiar la influencia de los parámetros de extrusión y las propiedades del material en el comportamiento de la transición entre diferentes materiales.
  • Crear regiones de transición graduadas en piezas impresas en 3D, mitigando los puntos débiles encontrados en la fabricación aditiva multimaterial a gran escala (MM-LFAM) tradicional.

Principales métodos:

  • Se integró una configuración de doble tolva en la plataforma BAAM para un cambio de material sin interrupciones.
  • Se analizaron las transiciones de materiales utilizando análisis composicional correlacionado con el volumen extruido.
  • El comportamiento de la transición se modeló utilizando una función de distribución acumulativa (CDF) de Weibull.
  • Los factores investigados incluyeron la velocidad del tornillo de extrusión, el diseño del componente, la dirección de la transición y la viscosidad del material.

Principales resultados:

  • La velocidad del tornillo de extrusión tuvo un impacto insignificante en el comportamiento de la transición.
  • Los diseños de componentes destinados a mejorar la mezcla de materiales dieron como resultado regiones más grandes de material mezclado.
  • La diferencia relativa y el cambio en la viscosidad compleja influyeron significativamente en el tamaño de la región de transición de material mezclado.
  • Las transiciones de materiales se modelaron con éxito utilizando la CDF de Weibull.

Conclusiones:

  • El novedoso sistema de doble tolva crea eficazmente transiciones de materiales graduados en LFAM.
  • Se pueden lograr transiciones de materiales y propiedades sintonizables optimizando la selección de materiales compuestos y modificando las viscosidades complejas.
  • Este enfoque ofrece una vía para superar los problemas de delaminación en la fabricación aditiva multimaterial a gran escala (LFAM), mejorando la integridad estructural.