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Related Concept Videos

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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Metal-Ligand Bonds02:51

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The hemoglobin in the blood, the chlorophyll in green plants, vitamin B-12, and the catalyst used in the manufacture of polyethylene all contain coordination compounds. Ions of the metals, especially the transition metals, are likely to form complexes.
In these complexes, transition metals form coordinate covalent bonds, a kind of Lewis acid-base interaction in which both of the electrons in the bond are contributed by a donor (Lewis base) to an electron acceptor (Lewis acid). The Lewis acid in...
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Ionic Crystal Structures02:42

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Ionic crystals consist of two or more different kinds of ions that usually have different sizes. The packing of these ions into a crystal structure is more complex than the packing of metal atoms that are the same size.
Most monatomic ions behave as charged spheres, and their attraction for ions of opposite charge is the same in every direction. Consequently, stable structures for ionic compounds result (1) when ions of one charge are surrounded by as many ions as possible of the opposite...
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Pore Transport and Ion-Pair Transport01:17

Pore Transport and Ion-Pair Transport

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Pore transport and ion-pair formation are critical mechanisms for the absorption and distribution of drugs in the body.
Pore transport, also known as convective transport, is a process where small molecules like urea, water, and sugars rapidly cross cell membranes as though there were channels or pores in the membrane. Although direct microscopic evidence is limited  but the concept of pores or channels is widely accepted based on physiological evidence. Despite the lack of direct...
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Secondary Active Transport01:32

Secondary Active Transport

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One example of how cells use the energy contained in electrochemical gradients is demonstrated by glucose transport into cells. The ion vital to this process is sodium (Na+), which is typically present in higher concentrations extracellularly than in the cytosol. Such a concentration difference is due, in part, to the action of an enzyme "pump" embedded in the cellular membrane that actively expels Na+ from a cell. Importantly, as this pump contributes to the high concentration of...
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Crystal Field Theory - Octahedral Complexes02:58

Crystal Field Theory - Octahedral Complexes

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Crystal Field Theory
To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It helps to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
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Related Experiment Video

Updated: May 22, 2025

Electrophoretic Crystallization of Ultrathin High-performance Metal-organic Framework Membranes
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Enhancing Selective Ion Transport by Stacking Covalent Organic Framework Monolayers.

Shixian Xin1, Yue Ying2, Han Xie1

  • 1School of Nanoscience and Engineering, School of Chemical Sciences, University of Chinese Academy of Sciences, Beijing, 100049, P. R. China.

Small Methods
|May 20, 2025
PubMed
Summary

Researchers enhanced salinity gradient energy harvesting using crystalline covalent organic framework (COF) membranes. Layer-by-layer stacking significantly boosted ion selectivity and osmotic energy conversion efficiency, achieving high output power.

Keywords:
covalent organic frameworkion transportosmotic power conversionselectivitystacking

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Area of Science:

  • Materials Science
  • Energy Harvesting
  • Nanotechnology

Background:

  • Salinity gradient energy harvesting offers a sustainable power source.
  • Covalent organic framework (COF) monolayers show promise for nanopore-based power generation due to high ion conductivity.
  • Improving ion selectivity and membrane permeability is crucial for enhanced energy conversion efficiency.

Purpose of the Study:

  • To enhance the ion selectivity and energy conversion performance of COF-based salinity gradient power generation.
  • To develop a scalable method for improving selective ion transport in ultra-thin COF membranes.

Main Methods:

  • A layer-by-layer stacking approach was employed to assemble ultra-thin COF layers.
  • The ion selectivity and transport properties of stacked COF membranes were investigated.
  • Osmotic energy conversion efficiency and output power density were measured under a NaCl salinity gradient.

Main Results:

  • Stacking anion-selective COF monolayers from one to ten layers increased the Cl-/Na+ ionic mobility ratio from 1.4 to 2.9.
  • This enhancement in selectivity led to a more than seven-fold increase in osmotic energy conversion efficiency.
  • A maximum output power of 411 pW was achieved with a three-layer stacked COF device, demonstrating maximized selectivity and permeability.

Conclusions:

  • Layer-by-layer stacking is an effective strategy to significantly improve the ion selectivity of COF membranes for salinity gradient energy harvesting.
  • The developed method offers a scalable approach for integrating atomically thin membranes in selective mass transport applications.
  • This work paves the way for advanced materials in sustainable energy generation and separation technologies.