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Videos de Conceptos Relacionados

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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Energy Transfer in Chemical Reactions01:16

Energy Transfer in Chemical Reactions

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Chemical reactions require sufficient energy to cause the matter to collide with enough precision and force that old chemical bonds can be broken and new ones formed. In general, kinetic energy is the form of energy powering any type of matter in motion. Imagine a person building a brick wall. The energy it takes to lift and place one brick on top of another is the kinetic energy—the energy matter possesses because of its motion. Once the wall is in place, it stores potential energy.
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Energy Diagrams, Transition States, and Intermediates02:13

Energy Diagrams, Transition States, and Intermediates

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Free-energy diagrams, or reaction coordinate diagrams, are graphs showing the energy changes that occur during a chemical reaction. The reaction coordinate represented on the horizontal axis shows how far the reaction has progressed structurally. Positions along the x-axis close to the reactants have structures resembling the reactants, while positions close to the products resemble the products.  Peaks on the energy diagram represent stable structures with measurable lifetimes, while...
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Thermal and Photochemical Electrocyclic Reactions: Overview01:26

Thermal and Photochemical Electrocyclic Reactions: Overview

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Electrocyclic reactions are reversible reactions. They involve an intramolecular cyclization or ring-opening of a conjugated polyene. Shown below are two examples of electrocyclic reactions. In the first reaction, the formation of the cyclic product is favored. In contrast, in the second reaction, ring-opening is favored due to the high ring strain associated with cyclobutene formation.
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Energy to Drive Translocation01:37

Energy to Drive Translocation

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Mitochondrial protein import is powered by two distinct energy sources: ATP hydrolysis and electrochemical potential across the inner membrane. Newly synthesized precursors are bound by cytosolic chaperones of the Hsp70 family, which guide them to the import receptors on the mitochondrial surface. Utilizing the energy of ATP hydrolysis, Hsp70 chaperones transfer these precursors to the TOM receptors on the mitochondrial outer membrane.
Generally, polypeptides are unfolded by two distinct...
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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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Characterization of Electrode Materials for Lithium Ion and Sodium Ion Batteries Using Synchrotron Radiation Techniques
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La transición energética requiere nuevos materiales

Chad A Mirkin1, Edward H Sargent2, Daniel P Schrag3

  • 1Chad A. Mirkin is director of the Northwestern University International Institute for Nanotechnology and is the George B. Rathmann Professor of Chemistry, Northwestern University, Evanston, IL, USA.

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|May 16, 2024
PubMed
Resumen
Este resumen es generado por máquina.

El avance de la energía limpia requiere superar los desafíos en la ciencia de los materiales. Los nuevos materiales son cruciales para la producción eficiente de energía, el consumo y la generación de combustible verde para combatir el cambio climático.

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Área de la Ciencia:

  • Ciencias de los materiales
  • Ciencias de la energía
  • Ciencias del medio ambiente

Sus antecedentes:

  • La disminución de los costos de las fuentes de energía renovables como la eólica y la solar, junto con los vehículos eléctricos, significa un progreso en el cambio de combustibles fósiles.
  • Una transición completa a la energía limpia se enfrenta a obstáculos significativos que deben abordarse.

Objetivo del estudio:

  • Resaltar el papel fundamental de los nuevos materiales para lograr una transición completa hacia la energía limpia.
  • Hacer hincapié en la necesidad de acelerar la investigación y el desarrollo de materiales energéticos.

Principales métodos:

  • Este estudio es una revisión y un análisis del estado actual de la investigación de materiales energéticos.
  • Sintetiza la información sobre el impacto de los materiales en la eficiencia energética y la utilización de los recursos.

Principales resultados:

  • Los nuevos materiales pueden mejorar la eficiencia de la producción y el consumo de energía.
  • La innovación en materia de materiales puede reducir la dependencia de los minerales escasos y permitir el hidrógeno verde, el amoníaco limpio y los combustibles neutros en carbono.
  • La investigación y el desarrollo actuales en materiales energéticos son insuficientes para satisfacer las demandas del cambio climático.

Conclusiones:

  • La ciencia de los materiales es fundamental para superar los desafíos de la transición a la energía limpia.
  • La aceleración de la I+D en materia de nuevos materiales energéticos es esencial para la mitigación del cambio climático.
  • Se requieren más inversiones y se debe centrarse en la innovación de materiales para lograr un futuro energético sostenible.