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Related Concept Videos

Membrane Fluidity01:23

Membrane Fluidity

177.3K
Cell membranes are composed of phospholipids, proteins, and carbohydrates loosely attached to one another through chemical interactions. Molecules are generally able to move about in the plane of the membrane, giving the membrane its flexible nature called fluidity. Two other features of the membrane contribute to membrane fluidity: the chemical structure of the phospholipids and the presence of cholesterol in the membrane.
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Membrane Fluidity01:26

Membrane Fluidity

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Membrane fluidity is explained by the fluid mosaic model of the cell membrane, which describes the plasma membrane structure as a mosaic of components—including phospholipids, cholesterol, proteins, and carbohydrates—that gives the membrane a fluid character.
Mosaic nature of the membrane
The mosaic characteristic of the membrane helps the plasma membrane remain fluid. The integral proteins and lipids exist as separate but loosely-attached molecules in the membrane. The membrane is...
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Potentiometry: Membrane Electrodes01:15

Potentiometry: Membrane Electrodes

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Membrane electrodes, also known as p-ion electrodes, use membranes that selectively interact with free analyte ions, generating a potential difference across the membrane. The resulting membrane potential, known as the asymmetry potential, is not zero even when analyte concentrations on both sides of the membrane are equal. The membrane's response is typically not selective to a single analyte but proportional to the concentration of all ions in the sample solution capable of interacting at...
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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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Dialysis01:15

Dialysis

2.0K
Dialysis is a diffusion-based purification process that separates analyte molecules from a complex matrix. This is accomplished by allowing molecules in the solution to pass through a semipermeable membrane into a liquid on the other side. The membrane is usually made of cellulose acetate or cellulose nitrate, and the second liquid must be miscible with the solution. Ions (e.g., chloride or sodium) or organic molecules (e.g., glucose) can pass through the membrane pores, which generally have...
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Updated: Feb 27, 2026

Merging Ion Concentration Polarization between Juxtaposed Ion Exchange Membranes to Block the Propagation of the Polarization Zone
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Stable Covalently Photo-Crosslinked Poly(Ionic Liquid) Membrane with Gradient Pore Size.

Alessandro Dani1, Karoline Täuber1, Weiyi Zhang1

  • 1Department of Colloid Chemistry, Max Planck Institute of Colloids and Interfaces, Am Mühlenberg 1, 14476, Potsdam, Germany.

Macromolecular Rapid Communications
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Summary

New porous membranes made from poly(ionic liquid) are stable in ionic solutions. UV light-induced crosslinking creates a unique porous structure for particle separation and actuation.

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Nanotechnology

Background:

  • Developing stable membranes for ionic environments is crucial for separation technologies.
  • Poly(ionic liquid)s offer unique properties but often lack stability and controlled porosity.
  • Covalent crosslinking is a promising strategy to enhance polymer stability and structure.

Purpose of the Study:

  • To create robust, porous polyelectrolyte membranes using covalent crosslinking of poly(ionic liquid)s.
  • To investigate the formation of interconnected porous structures via UV-induced thiol-ene chemistry.
  • To evaluate the membrane's performance in particle separation and its actuation behavior.

Main Methods:

  • Covalent crosslinking of an imidazolium-based poly(ionic liquid) via UV light-induced thiol-ene click chemistry.
  • Phase separation during crosslinking to generate a micrometer-scale porous structure.
  • Characterization of pore size distribution and membrane cross-section.
  • Testing particle separation capabilities and actuation response in acetone.

Main Results:

  • Successfully synthesized porous polyelectrolyte membranes with stability in highly ionic environments.
  • UV-induced thiol-ene chemistry led to phase separation and an interconnected porous structure.
  • A gradient of pore size was observed across the membrane's cross-section.
  • The membranes demonstrated effective separation of polystyrene latex particles and actuation in acetone.

Conclusions:

  • Covalent crosslinking of poly(ionic liquid)s provides a viable route to stable, porous membranes.
  • The controlled porosity enables applications in particle separation and responsive materials.
  • The developed membranes show potential for advanced separation and actuation technologies.