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Related Concept Videos

Membrane Fluidity01:23

Membrane Fluidity

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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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Enzymes like flippase, floppase, and scramblase transfer phospholipids from one layer to another in the membrane, thereby affecting membrane asymmetry.
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Eukaryotic flippases are type-IV P-type ATPases or P4-ATPases belonging to P-type ATPase family proteins that are membrane-bound pumps involved in the ATP-mediated transport of ions and molecules across the membrane. Flippases flip specific phospholipids from the outer to the inner leaflet of a membrane. All P4-ATPases have one...
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A key characteristic of life is the ability to separate the external environment from the internal space. To do this, cells have evolved semi-permeable membranes that regulate the passage of biological molecules. Additionally, the cell membrane defines a cell’s shape and interactions with the external environment. Eukaryotic cell membranes also serve to compartmentalize the internal space into organelles, including the endomembrane structures of the nucleus, endoplasmic reticulum and...
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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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Membranes Based on PTMSP/PVTMS Blends for Membrane Contactor Applications.

Denis Kalmykov1, Alexey Balynin1, Alexey Yushkin1

  • 1A.V. Topchiev Institute of Petrochemical Synthesis RAS, 29 Leninsky Prospekt, 119991 Moscow, Russia.

Membranes
|November 24, 2022
PubMed
Summary

New polymeric membranes were developed for removing dissolved oxygen from carbon dioxide (CO2) capture solvents. The PTMSP/PVTMS 70/30 blend offers optimal oxygen permeability and separation factor for efficient CO2 capture processes.

Keywords:
PTMSPPVTMScarbon dioxidemembrane contactoroxygen removal

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Area of Science:

  • Polymer science and engineering
  • Chemical engineering
  • Materials science

Background:

  • Membrane contactors are crucial for gas separation processes.
  • Efficient removal of dissolved oxygen from amine-based CO2 capture solvents is essential to prevent solvent degradation and maintain capture efficiency.
  • Polymeric materials offer tunable properties for membrane applications.

Purpose of the Study:

  • To develop novel polymeric blend membranes for dissolved oxygen removal in CO2 capture.
  • To investigate the gas and vapor transport properties of poly[1-trimethylsilyl-1-propyne] (PTMSP) and poly[vinyltrimethylsilane] (PVTMS) blends.
  • To evaluate the performance of these membranes in a thermo-pervaporation (TPV) mode for amine solvent recovery.

Main Methods:

  • Fabrication of PTMSP/PVTMS blend membranes with varying compositions (0-100% PVTMS).
  • Measurement of gas (O2, CO2) and water vapor sorption and permeability coefficients at 30 and 60 °C.
  • Thermo-pervaporation (TPV) experiments using aqueous monoethanolamine, N-methyldiethanolamine, and 2-amino-2-methyl-1-propanol solutions at 60 °C.

Main Results:

  • Increasing PVTMS content significantly decreased O2 and CO2 permeabilities (160x and 195x, respectively, at 30 °C) and fractional accessible volume.
  • PTMSP/PVTMS blend membranes exhibited high pervaporation separation factors for water, minimizing amine losses.
  • The PTMSP/PVTMS 70/30 blend demonstrated a favorable balance between high oxygen permeability and effective pervaporation separation at 60 °C.

Conclusions:

  • The PTMSP/PVTMS blend composition can be tailored to control gas permeability and separation performance.
  • The developed membranes are effective for dissolved oxygen removal and amine solvent recovery in CO2 capture applications.
  • The PTMSP/PVTMS 70/30 blend is identified as an optimal composition for membrane contactor applications in CO2 capture.