Jove
Visualize
Contáctanos
JoVE
x logofacebook logolinkedin logoyoutube logo
ACERCA DE JoVE
Visión GeneralLiderazgoBlogCentro de Ayuda JoVE
AUTORES
Proceso de PublicaciónConsejo EditorialAlcance y PolíticasRevisión por ParesPreguntas FrecuentesEnviar
BIBLIOTECARIOS
TestimoniosSuscripcionesAccesoRecursosConsejo Asesor de BibliotecasPreguntas Frecuentes
INVESTIGACIÓN
JoVE JournalMethods CollectionsJoVE Encyclopedia of ExperimentsArchivo
EDUCACIÓN
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab ManualCentro de Recursos para ProfesoresSitio de Profesores
Términos y Condiciones de Uso
Política de Privacidad
Políticas

Videos de Conceptos Relacionados

Ion Exchange01:17

Ion Exchange

657
Ion exchange chromatography separates charged molecules from a solution by reversibly exchanging them with mobile, or 'active', ions associated with the oppositely charged stationary phase. This method can be used to separate ions, soften and deionize water, and purify solutions. The polymers comprising the ion-exchange column are high-molecular-weight and chemically stable polymers, crosslinked to be porous and essentially insoluble. They are also functionalized with either acidic or...
657
Ion-Exchange Chromatography01:09

Ion-Exchange Chromatography

759
Ion-exchange chromatography, or IEC, is a technique for separating ions based on their affinity for the stationary phase. The stationary phase is a cross-linked polymer resin with covalently attached ionic functional groups. The functional groups can be either positively charged (cation exchangers) or negatively charged (anion exchangers). A cation exchanger consists of a polymeric anion and active cations, while an anion exchanger is a polymeric cation with active anions. The choice of...
759
Aqueous Solutions and Heats of Hydration02:42

Aqueous Solutions and Heats of Hydration

15.0K
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...
15.0K
Extraction: Advanced Methods00:56

Extraction: Advanced Methods

526
Metal ions can be separated from one another by complexation with organic ligands–the chelating agent– to form uncharged chelates. Here, the chelating agent must contain hydrophobic groups and behave as a weak acid, losing a proton to bind with the metal. Since most organic ligands used in this process are insoluble or undergo oxidation in the aqueous phase, the chelating agent is initially added to the organic phase and extracted into the aqueous phase. The metal-ligand complex is...
526
Formation of Complex Ions03:45

Formation of Complex Ions

24.0K
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...
24.0K
Common Ion Effect03:24

Common Ion Effect

42.2K
Compared with pure water, the solubility of an ionic compound is less in aqueous solutions containing a common ion (one also produced by dissolution of the ionic compound). This is an example of a phenomenon known as the common ion effect, which is a consequence of the law of mass action that may be explained using Le Châtelier’s principle. Consider the dissolution of silver iodide:
42.2K

También podría leer

Artículos Relacionados

Artículos vinculados a este trabajo por autores compartidos, revista y gráfico de citas.

Ordenar por
Same author

Calculating Nonbonded Potentials for Classical Simulations of Atoms in Molecules and Metal Surfaces.

Journal of chemical theory and computation·2025
Same author

Tuning partial charges of alkyl alcohols to improve simulated fluid properties.

The Journal of chemical physics·2025
Same author

Reconciling Chain Orientation in Polymer-Grafted Nanoparticles between Coarse-Grained Models and Resonant Soft X-ray Scattering.

ACS nano·2025
Same author

Efficient simulations of mobility matrices for electrolytes by applying forces.

Chemical science·2024
Same author

Crystalline and Amorphous Interface Simulations of Donor-Acceptor Blends.

Journal of chemical theory and computation·2024
Same author

Tight-binding model predicts exciton energetics and structure for photovoltaic molecules.

Physical chemistry chemical physics : PCCP·2024

Video Experimental Relacionado

Updated: Sep 9, 2025

Merging Ion Concentration Polarization between Juxtaposed Ion Exchange Membranes to Block the Propagation of the Polarization Zone
08:06

Merging Ion Concentration Polarization between Juxtaposed Ion Exchange Membranes to Block the Propagation of the Polarization Zone

Published on: February 23, 2017

8.6K

La exclusión efectiva de iones requiere la eliminación de la capa de hidratación

Ritwick Kali1, Scott T Milner1

  • 1Department of Chemical Engineering, The Pennsylvania State University, University Park, Pennsylvania 16802, United States.

The journal of physical chemistry. B
|August 28, 2025
PubMed
Resumen
Este resumen es generado por máquina.

Los poros más estrechos en las membranas de poliestireno sulfonado son clave para la exclusión efectiva de iones en la desalinización. Los iones pierden capas de hidratación cerca de las paredes de los poros, lo que sugiere que los poros neutros pueden mejorar la eficiencia de la desalinización.

Más Videos Relacionados

On-chip Isotachophoresis for Separation of Ions and Purification of Nucleic Acids
10:32

On-chip Isotachophoresis for Separation of Ions and Purification of Nucleic Acids

Published on: March 2, 2012

24.7K
Ion Exchange Chromatography IEX Coupled to Multi-angle Light Scattering MALS for Protein Separation and Characterization
10:41

Ion Exchange Chromatography IEX Coupled to Multi-angle Light Scattering MALS for Protein Separation and Characterization

Published on: April 5, 2019

18.1K

Videos de Experimentos Relacionados

Last Updated: Sep 9, 2025

Merging Ion Concentration Polarization between Juxtaposed Ion Exchange Membranes to Block the Propagation of the Polarization Zone
08:06

Merging Ion Concentration Polarization between Juxtaposed Ion Exchange Membranes to Block the Propagation of the Polarization Zone

Published on: February 23, 2017

8.6K
On-chip Isotachophoresis for Separation of Ions and Purification of Nucleic Acids
10:32

On-chip Isotachophoresis for Separation of Ions and Purification of Nucleic Acids

Published on: March 2, 2012

24.7K
Ion Exchange Chromatography IEX Coupled to Multi-angle Light Scattering MALS for Protein Separation and Characterization
10:41

Ion Exchange Chromatography IEX Coupled to Multi-angle Light Scattering MALS for Protein Separation and Characterization

Published on: April 5, 2019

18.1K

Área de la Ciencia:

  • Ciencias de los materiales
  • Química Física
  • Ingeniería Química

Sus antecedentes:

  • Las membranas de poliestireno sulfonado presentan una nanoestructura con poros hidrófilos interconectados dentro de una matriz hidrofóbica.
  • El tamaño de los poros influye críticamente en los coeficientes de partición de sal, lo que afecta el rendimiento de la membrana.

Objetivo del estudio:

  • Establecer una correlación directa entre el tamaño de los poros y el particionamiento de la sal en las membranas de poliestireno sulfonado.
  • Investigar el comportamiento de los iones dentro de espacios de poros confinados para aplicaciones de desalinización.

Principales métodos:

  • Construcción de un modelo simplificado de poros utilizando paredes planas de poliestireno sulfonado.
  • Variación sistemática del tamaño de los poros ajustando la separación entre las paredes del polímero.
  • Análisis del comportamiento iónico y la dinámica de la capa de hidratación dentro del entorno de poros controlado.

Principales resultados:

  • Los poros más grandes (> subnanómetro) presentan una exclusión de iones insuficiente debido a las barreras entrópicas y a una concentración de iones no uniforme.
  • Los poros más estrechos (< tamaño del ion hidratado) son necesarios para la exclusión efectiva de iones.
  • Los iones comienzan la deshidratación aproximadamente a 0,5 nm de la pared del poro, con interacciones electrostáticas que los estabilizan.

Conclusiones:

  • La exclusión efectiva de iones para la desalinización requiere poros más pequeños que los iones hidratados.
  • La distribución no uniforme de iones en los poros más grandes limita su utilidad en la exclusión práctica de iones.
  • Los poros neutros podrían ofrecer un rendimiento de desalinización superior debido a los iones estabilizados cerca de las paredes de los poros a pesar de la pérdida de hidratación.