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In ordinary chemical reactions, the nucleus — which contains the protons and neutrons of each atom and thus identifies the element — remains unchanged. Electrons, however, can be added to atoms by transfer from other atoms, lost by transfer to other atoms, or shared with other atoms. The transfer and sharing of electrons among atoms govern the chemistry of the elements. During the formation of some compounds, atoms gain or lose electrons to form electrically charged particles called...
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An ionic compound is stable because of the electrostatic attraction between its positive and negative ions. The lattice energy of a compound is a measure of the strength of this attraction. The lattice energy (ΔHlattice) of an ionic compound is defined as the energy required to separate one mole of the solid into its component gaseous ions. For the ionic solid sodium chloride, the lattice energy is the enthalpy change of the process:
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Preparation of Neutrally-charged, pH-responsive Polymeric Nanoparticles for Cytosolic siRNA Delivery
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Interacción de nanopartículas cargadas en suspensiones desionizadas

Alexandre P Dos Santos1, Yan Levin1

  • 1Instituto de Física, Universidade Federal do Rio Grande do Sul, Caixa Postal 15051, CEP 91501-970 Porto Alegre, RS, Brazil.

The Journal of chemical physics
|February 12, 2026
PubMed
Resumen
Este resumen es generado por máquina.

Presentamos un nuevo modelo teórico para las interacciones de nanopartículas cargadas en suspensiones desionizadas. Este marco predice con precisión los potenciales de interacción sin parámetros ajustables, validado por simulaciones.

Palabras clave:
nanopartículas cargadassuspensiones desionizadasmodelo rJelliumpotenciales de interacciónsimulaciones

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Área de la Ciencia:

  • Ciencia de Coloides y Superficies
  • Física Teórica
  • Química Computacional

Sus antecedentes:

  • La comprensión de las interacciones de nanopartículas es crucial para el diseño de materiales avanzados.
  • Los modelos existentes a menudo requieren parámetros ajustables o fallan en separaciones cortas.
  • La teoría de Derjaguin, Landau, Verwey y Overbeek (DLVO) es una piedra angular para la estabilidad coloidal.

Objetivo del estudio:

  • Desarrollar un marco teórico robusto para calcular los potenciales de interacción entre nanopartículas cargadas.
  • Modelar con precisión las interacciones de nanopartículas en diversas condiciones sin ajuste empírico.
  • Proporcionar una herramienta predictiva para suspensiones coloidales.

Principales métodos:

  • Se utilizó el modelo de Jellium renormalizado (rJellium) para determinar las cargas efectivas de las nanopartículas.
  • Se combinó rJellium con una aproximación de Derjaguin modificada para interacciones de corto alcance.
  • Se validaron las predicciones teóricas frente a extensas simulaciones de Monte Carlo con sumación de Ewald.

Principales resultados:

  • Se logró una excelente concordancia cuantitativa entre las predicciones teóricas y los datos de simulación.
  • El modelo captura con precisión las interacciones en diversos tamaños de partícula, cargas superficiales y fracciones de volumen.
  • Se demostró la validez del marco sin emplear parámetros ajustables.

Conclusiones:

  • El marco teórico desarrollado proporciona un método altamente preciso y sin parámetros para predecir las interacciones de nanopartículas.
  • Este enfoque mejora el poder predictivo de la ciencia coloidal para suspensiones desionizadas.
  • Ofrece una herramienta fiable para el diseño y la manipulación de sistemas de nanopartículas.