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Related Concept Videos

Colloidal precipitates01:09

Colloidal precipitates

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The high insolubility of some precipitates can result in an unfavorable relative supersaturation. This can lead to colloidal particles with a large surface-to-mass ratio, where adsorption is promoted. For instance, in the precipitation of silver chloride, silver ions are adsorbed on the surface of the colloidal particles, forming a primary layer. This layer attracts ions of opposite charge (such as nitrate ions), forming a diffuse secondary layer of adsorbed ions. This electric double layer...
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Detergents are used to purify the integral proteins of the membrane. The hydrophobic portion of the detergent can replace membrane phospholipids while solubilizing the membrane proteins. When detergent monomers reach a specific concentration in a solution called critical micelle concentration (CMC), they form micelles. Above CMC, the concentration of the detergent monomers remains in equilibrium with the micelle. The number of detergent monomers present in the CMC varies for each detergent, and...
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Optimizing chromatographic separations is crucial for obtaining clean separations in a minimum amount of time. Optimization is required for several factors, including kinetic effects related to band broadening, plate height, capacity factor, and separation factor.
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Capillary Electrophoresis: Applications01:30

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Capillary electrophoretic separations offer various modes, each with unique applications. These modes include capillary zone electrophoresis, capillary gel electrophoresis, capillary array electrophoresis, capillary isoelectric focusing, capillary isotachophoresis, micellar electrokinetic chromatography, and capillary electrochromatography.
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Cell Co-culture Patterning Using Aqueous Two-phase Systems
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Optimization of Polyelectrolyte Coacervate Membranes via Aqueous Phase Separation.

Shao-Hsiang Joe Hung1, Meng-Chen Chiang1, Jessica D Schiffman1

  • 1Department of Chemical Engineering, University of Massachusetts Amherst, Amherst, Massachusetts 01003-9303, United States.

ACS Applied Materials & Interfaces
|December 19, 2024
PubMed
Summary

Polyelectrolyte complexes (PECs) offer a sustainable alternative for water purification membranes, utilizing aqueous phase separation instead of toxic solvents. These novel PEC membranes show high performance in dye removal and bacteria repulsion.

Keywords:
antifoulingcharged polymersdye rejectionphase inversionsalt annealingsustainability

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Environmental Engineering

Background:

  • Conventional polymeric membranes rely on toxic organic solvents like NMP for fabrication.
  • There is a critical need for sustainable membrane fabrication processes for water purification.

Purpose of the Study:

  • To investigate the potential of polyelectrolyte complexes (PECs) for sustainable membrane fabrication.
  • To explore the use of aqueous phase separation for creating next-generation water purification membranes.

Main Methods:

  • Fabrication of membranes using poly(sodium 4-styrenesulfonate) (PSS) and poly(diallyldimethylammonium chloride) (PDADMAC) in potassium bromide (KBr) solution.
  • Systematic evaluation of dope solution and coagulation bath effects on membrane formation, morphology, and pure water permeance (PWP).
  • Analysis using scanning electron microscopy and dead-end filtration tests; assessment of salt annealing post-treatment.

Main Results:

  • Treated PEC membranes achieved a PWP of 6.2 L m⁻² h⁻¹ bar⁻¹.
  • High dye removal efficiency: 91.7% for methyl orange and 80.5% for methylene blue.
  • Demonstrated ability to repel *Escherichia coli* bacteria under static conditions.

Conclusions:

  • PEC membranes fabricated via aqueous phase separation offer a sustainable and effective alternative to conventional membranes.
  • The study provides fundamental insights into PEC membrane pore formation and separation mechanisms.
  • Findings support the development of advanced, eco-friendly materials for membrane-based separations.