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Related Concept Videos

Types of Step-Growth Polymers: Polyesters01:20

Types of Step-Growth Polymers: Polyesters

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The introduction of polyesters has brought major development to the textile industry. The wrinkle-free behavior of polyester blends has eliminated the need for starching and ironing clothes.
Polyesters are commonly prepared from terephthalic acid and ethylene glycol; the crude product is known as poly(ethylene terephthalate) or PET. However, polyesters are synthesized industrially by transesterification of dimethyl terephthalate with ethylene glycol at 150 °C. The two reactants and the...
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Potentiometry: Membrane Electrodes01:15

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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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Dialysis01:15

Dialysis

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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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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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Related Experiment Video

Updated: Jun 27, 2025

Ion-Exchange Membranes for the Fabrication of Reverse Electrodialysis Device
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More resilient polyester membranes for high-performance reverse osmosis desalination.

Yujian Yao1, Pingxia Zhang2, Fei Sun1

  • 1Key Laboratory of New Membrane Materials, Ministry of Industry and Information Technology, School of Environmental and Biological Engineering, Nanjing University of Science and Technology, Nanjing 210094, China.

Science (New York, N.Y.)
|April 26, 2024
PubMed
Summary

Researchers developed a novel polyester membrane for desalination, offering superior chlorine resistance, boron rejection, and fouling prevention compared to traditional polyamide membranes.

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Area of Science:

  • Materials Science
  • Chemical Engineering
  • Environmental Science

Background:

  • Thin-film composite reverse osmosis membranes are crucial for desalination but face limitations like poor chlorine resistance and fouling.
  • Polyamide membranes, the current standard, exhibit drawbacks including low boron rejection and susceptibility to fouling and scaling.

Purpose of the Study:

  • To address the limitations of polyamide membranes in reverse osmosis.
  • To design and synthesize a novel polyester thin-film composite membrane with enhanced properties for desalination and water purification.

Main Methods:

  • Molecular design and synthesis of a polyester membrane via co-solvent-assisted interfacial polymerization.
  • Reacting 3,5-dihydroxy-4-methylbenzoic acid with trimesoyl chloride to form the polyester film.
  • Characterization of membrane performance, including water permeability, salt rejection, boron rejection, and chlorine resistance.

Main Results:

  • The novel polyester membrane demonstrated substantial water permeability and high rejection rates for sodium chloride and boron.
  • The membrane exhibited complete resistance to chlorine, a significant improvement over polyamide membranes.
  • The ultrasmooth, low-energy surface of the polyester membrane effectively prevented fouling and mineral scaling.

Conclusions:

  • The developed polyester membrane offers a promising alternative to conventional polyamide membranes for desalination.
  • Its enhanced properties, including chlorine resistance and fouling prevention, could simplify pretreatment processes.
  • Further optimization of water-salt selectivity could position these polyester membranes to challenge the dominance of polyamide membranes in water purification.