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Related Concept Videos

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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Leveling Effect01:29

Leveling Effect

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In acid-base chemistry, the leveling effect refers to the limitation imposed by the solvent on the strength of acids and bases in solution. When a base stronger than the solvent's conjugate base is used, it deprotonates the solvent until the base is entirely consumed, making it ineffective against weaker acids. Conversely, an acid stronger than the solvent's conjugate acid protonates the solvent until the acid is depleted, rendering it ineffective against weaker bases. Essentially, the...
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Intermolecular Forces

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Atoms and molecules interact through bonds (or forces): intramolecular and intermolecular. The forces are electrostatic as they arise from interactions (attractive or repulsive) between charged species (permanent, partial, or temporary charges) and exist with varying strengths between ions, polar, nonpolar, and neutral molecules. The different types of intermolecular forces are ion–dipole, dipole–dipole, hydrogen bonds, and dispersion; among these, dipole–dipole, hydrogen...
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Drug Absorption Mechanism: Carrier-Mediated Membrane Transport01:19

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Certain large, lipid-insoluble drug molecules that resemble amino acids, peptides, or glucose, require specialized carrier proteins to facilitate their diffusion across cell membranes. This transport can occur through either facilitated diffusion, which does not require energy input, or active transport, which does require energy input.
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Ion-Exchange Chromatography01:09

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Ion-exchange chromatography, or IEC, is a technique for separating ions based on their affinity for the stationary phase. The stationary phase is a cross-linked polymer resin with covalently attached ionic functional groups. The functional groups can be either positively charged (cation exchangers) or negatively charged (anion exchangers). A cation exchanger consists of a polymeric anion and active cations, while an anion exchanger is a polymeric cation with active anions. The choice of...
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Drug Absorption Mechanism: Passive Membrane Transport01:23

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Passive transport is a method of drug absorption where small, lipid-soluble drugs can move across the cell membrane. This movement happens along the concentration gradient, which is a natural flow from higher to lower concentration areas. The speed at which the drug moves is directly related to its lipid–water partition coefficient. This means that the more a drug dissolves in lipids, the faster it diffuses or spreads throughout the body. It is important to note that most drugs are either...
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Merging Ion Concentration Polarization between Juxtaposed Ion Exchange Membranes to Block the Propagation of the Polarization Zone
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Enhancing CO2 Transport Across a PEEK-Ionene Membrane and Water-Lean Solvent Interface.

Eric D Walter1, Difan Zhang1, Ying Chen1

  • 1Pacific Northwest National Laboratory, Battelle Blvd, 99352, Richland, WA, USA.

Chemsuschem
|May 24, 2023
PubMed
Summary

Direct air capture (DAC) of carbon dioxide (CO2) is enhanced by combining a CO2-selective membrane with a water-lean solvent. This system funnels CO2 through the membrane, increasing capture efficiency.

Keywords:
NMR spectroscopyabsorptioncarbon dioxide capturemembraneswater-lean solvent

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Area of Science:

  • Chemical Engineering
  • Materials Science
  • Environmental Science

Background:

  • Direct air capture (DAC) of carbon dioxide (CO2) faces challenges due to its low atmospheric concentration.
  • Combining CO2-selective membranes with capture solvents is a promising DAC strategy.
  • Understanding the interactions within these systems is crucial for optimizing CO2 capture.

Purpose of the Study:

  • To investigate the interactions between a water-lean carbon capture solvent, a polyether ether ketone (PEEK)-ionene membrane, and CO2.
  • To elucidate the mechanism of CO2 diffusion through the membrane and into the solvent.
  • To identify how the capture solvent enhances membrane performance.

Main Methods:

  • Advanced Nuclear Magnetic Resonance (NMR) techniques were employed.
  • Advanced computational simulations were utilized.
  • Spectroscopic evidence was gathered to analyze molecular interactions and dynamics.

Main Results:

  • CO2 diffusion was observed through benzylic regions of the PEEK-ionene membrane, contrary to expectations of diffusion through ionic lattice spaces.
  • Water-lean solvents act as a thermodynamic and kinetic funnel, drawing CO2 from the air through the membrane.
  • The reaction of CO2 with the solvent forms carbamic acid, which disrupts membrane interactions and facilitates CO2 diffusion.

Conclusions:

  • The PEEK-ionene membrane's structure is altered by CO2 capture solvent interactions, enhancing CO2 permeability.
  • CO2 diffusion at the membrane-solvent interface is faster than in the bulk solvent.
  • This integrated system significantly improves the efficiency of direct air capture processes.