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Ion Exchange01:17

Ion Exchange

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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...
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Ion-Exchange Chromatography01:09

Ion-Exchange Chromatography

1.6K
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...
1.6K
Basicity of Heterocyclic Aromatic Amines01:25

Basicity of Heterocyclic Aromatic Amines

6.8K
Heterocyclic amines, where the N atom is a part of an alicyclic system, are similar in basicity to alkylamines. Interestingly, the heterocyclic amine having a nitrogen atom as part of an aromatic ring has much less basicity than its corresponding alicyclic counterpart. For this reason, as presented in Figure 1, piperidine (pKb = 2.8) is significantly more basic than pyridine (pKb = 8.8).
6.8K
Anionic Chain-Growth Polymerization: Overview01:20

Anionic Chain-Growth Polymerization: Overview

2.4K
The polymerization process that involves carbanion as an intermediate is called anionic polymerization. It is also a type of addition or chain-growth polymerization. Anionic polymerization gets initiated by a strong nucleophile such as an organolithium or a Grignard reagent. The most commonly used initiator for anionic polymerization is butyl lithium. Monomers involved in anionic polymerization must possess a vinyl group bonded to one or two electron-withdrawing groups. For instance,...
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Updated: Dec 21, 2025

Fabricating Degradable Thermoresponsive Hydrogels on Multiple Length Scales via Reactive Extrusion, Microfluidics, Self-assembly, and Electrospinning
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Hospedadores de polímeros impresos basados en urea con preferencia de aniones conmutables

Sudhirkumar Shinde1,2, Anil Incel1, Mona Mansour1

  • 1Department of Biomedical Sciences, Faculty of Health and Society, Malmö University, 20506 Malmö, Sweden.

Journal of the American Chemical Society
|May 20, 2020
PubMed
Resumen
Este resumen es generado por máquina.

Este estudio introduce polímeros impresos molecularmente (MIP) con una preferencia conmutable por los iones fosfonato o sulfonato, obtenidos utilizando modificadores de moléculas pequeñas. Estos receptores avanzados ofrecen selectividad sintonizable para el reconocimiento aniónico en la química huésped-invitado.

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Área de la Ciencia:

  • La química entre el anfitrión y el huésped
  • Química supramolecular
  • Ciencia de los polímeros

Sus antecedentes:

  • El diseño de receptores artificiales con preferencia de iones conmutables es un desafío significativo.
  • Los polímeros impresos molecularmente (MIP) ofrecen una plataforma versátil para el reconocimiento molecular.

Objetivo del estudio:

  • Desarrollar precios mínimos de importación con una preferencia conmutable externa para los oxyaniones.
  • Investigar el mecanismo de impresión y las características de unión de estos nuevos polímeros.

Principales métodos:

  • Impresión mediada por enlace de hidrógeno utilizando un monómero huésped funcional.
  • Titraciones de RMN H y NOESY de RMN H-H para elucidar la interacción.
  • Simulaciones dinámicas moleculares y estudios cromatográficos para conocimientos mecanicistas.

Principales resultados:

  • Los PIM demostraron la unión selectiva del ácido fenilfosfónico (PPA) y el ácido fenilsulfónico (PSA).
  • La retentividad cromatográfica conmutable para el fosfonato frente al sulfonato se logró alterando la acidez del modificador.
  • Se observaron la formación de complejos de alto orden y las repeticiones de diadomas inducidas por la plantilla en la columna vertebral del polímero.

Conclusiones:

  • Los MIP desarrollados muestran una selectividad ajustable para los iones de oxyanión a través de un interruptor externo.
  • El estudio proporciona información mecanicista sobre la impresión de configuración y conformación en polímeros.
  • Este trabajo avanza en el diseño de sistemas de anfitrión-invitado inteligentes para el reconocimiento de aniones.