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Videos de Conceptos Relacionados

Intermolecular Forces03:13

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Atoms and molecules interact through bonds (or forces): intramolecular and intermolecular. The forces are electrostatic as they arise from interactions (attractive or repulsive) between charged species (permanent, partial, or temporary charges) and exist with varying strengths between ions, polar, nonpolar, and neutral molecules. The different types of intermolecular forces are ion–dipole, dipole–dipole, hydrogen bonds, and dispersion; among these, dipole–dipole, hydrogen...
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Aqueous Solutions and Heats of Hydration02:42

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Water and other polar molecules are attracted to ions. The electrostatic attraction between an ion and a molecule with a dipole is called an ion-dipole attraction. These attractions play an important role in the dissolution of ionic compounds in water.
When ionic compounds dissolve in water, the ions in the solid separate and disperse uniformly throughout the solution because water molecules surround and solvate the ions, reducing the strong electrostatic forces between them. This process...
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Electrolyte and Nonelectrolyte Solutions02:21

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Substances that undergo either a physical or a chemical change in solution to yield ions that can conduct electricity are called electrolytes. If a substance yields ions in solution, that is, if the compound undergoes 100% dissociation, then the substance is a strong electrolyte. Complete dissociation is indicated by a single forward arrow. For example, water-soluble ionic compounds like sodium chloride dissociate into sodium cations and chloride anions in aqueous solution.
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The formation of a solution is an example of a spontaneous process, a process that occurs under specified conditions without energy from some external source.
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A type of Lewis acid-base chemistry involves the formation of a complex ion (or a coordination complex) comprising a central atom, typically a transition metal cation, surrounded by ions or molecules called ligands. These ligands can be neutral molecules like H2O or NH3, or ions such as CN− or OH−. Often, the ligands act as Lewis bases, donating a pair of electrons to the central atom. These types of Lewis acid-base reactions are examples of a broad subdiscipline called coordination...
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A bond is formed between two atoms by sharing two electrons. When this bond is broken by supplying sufficient energy, either two electrons can be taken up by one atom forming ions by the cleavage called heterolysis, or the two electrons are shared by two atoms, with one each creating radicals by the cleavage called homolysis.
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Updated: Sep 20, 2025

A Microfluidic Approach for the Study of Ice and Clathrate Hydrate Crystallization
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La división directa del hielo en H2 y O2 habilitada por la alta conductividad iónica

Bohan Deng1,2, Guangqiang Yu3, Wei Zhao1

  • 1State Key Laboratory of New Ceramic Materials, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China.

Journal of the American Chemical Society
|May 23, 2025
PubMed
Resumen
Este resumen es generado por máquina.

Los investigadores han logrado dividir el hielo en estado sólido en hidrógeno y oxígeno a temperaturas tan bajas como -40 °C. Este avance utiliza el hielo como electrolito sólido, lo que permite una eficiente conversión y almacenamiento de energía en condiciones bajo cero.

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Área de la Ciencia:

  • La electroquímica
  • Ciencias de los materiales
  • Almacenamiento de energía

Sus antecedentes:

  • La división molecular de H2O (agua) es crucial para la conversión y el almacenamiento de energía.
  • Si bien se ha establecido la división del agua líquida, la descomposición del hielo en estado sólido sigue siendo un desafío.

Objetivo del estudio:

  • Para demostrar la división directa del hielo a temperaturas bajo cero.
  • Investigar el hielo como electrolito sólido para aplicaciones electroquímicas.
  • Explorar nuevas vías para la conversión y almacenamiento de energía utilizando hielo.

Principales métodos:

  • Análisis electroquímico del hielo en estado sólido.
  • Medición de la conducción de protones e hidróxido en el hielo.
  • Mediciones de la densidad de tensión y corriente para la división del hielo.
  • Cálculos de eficiencia energética a temperaturas bajo cero.

Principales resultados:

  • Se ha demostrado el éxito de la división directa del hielo a temperaturas tan bajas como -40 °C.
  • El hielo funciona como un electrolito sólido de alto rendimiento para la conducción de protones e hidróxido.
  • La movilidad de los protones en el hielo es 1-2 órdenes de magnitud mayor que en el agua líquida.
  • La división del hielo se logra a 2,18 V con una eficiencia energética de ~70% a -10 °C.
  • Elusión de los problemas de cruce de hidrógeno inherentes a la división del agua líquida.

Conclusiones:

  • El hielo se puede dividir directamente electroquímicamente a temperaturas bajo cero, abriendo nuevas vías de conversión de energía.
  • El hielo sirve como un electrolito sólido eficaz, superando al agua líquida en términos de movilidad de protones y evitando el cruce de hidrógeno.
  • Estos hallazgos ofrecen nuevos conocimientos sobre los procesos electroquímicos en el hielo y presentan oportunidades para soluciones de almacenamiento de energía a baja temperatura.