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Related Concept Videos

Pore Size Distribution01:23

Pore Size Distribution

333
In concrete, the pore size distribution significantly influences the material's properties. Capillary pores, markedly larger than gel pores, form a vast network within partially hydrated cement paste, reducing the concrete's strength and increasing its permeability. This heightened permeability leads to a greater risk of damage from environmental factors like freeze-thaw cycles and chemical attacks, with the extent of vulnerability also being tied to the water-to-cement ratio.
Adequate...
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Pore structure in supermacroporous polyacrylamide based cryogels.

Fatima M Plieva1, Malin Karlsson2, Maria-Rosa Aguilar3

  • 1Department of Biotechnology, Center for Chemistry and Chemical Engineering, Lund University, PO Box 124, SE-22100 Lund, Sweden. igor.galaev@biotek.lu.se and Protista Biotechnology AB, IDEON, SE-22370 Lund, Sweden.

Soft Matter
|July 11, 2020
PubMed
Summary
This summary is machine-generated.

Polyacrylamide cryogels (pAAm-cryogels) exhibit tunable pore structures. Ligand accessibility for small molecules increases with monomer concentration, while large molecules like proteins show optimal binding at 18% monomer concentration.

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Area of Science:

  • Polymer Science
  • Materials Science
  • Biomaterials

Background:

  • Macroporous polyacrylamide cryogels (pAAm-cryogels) are versatile materials.
  • Their porous structure and properties can be tailored by adjusting synthesis parameters.

Purpose of the Study:

  • To control pore size and pore wall thickness in pAAm-cryogels.
  • To investigate the influence of monomer concentration on cryogel structure and ligand accessibility.
  • To evaluate the accessibility of immobilized ligands for both small and large molecules.

Main Methods:

  • Synthesis of pAAm-cryogels with varying monomer concentrations.
  • Environmental scanning electron microscopy (ESEM) for visualizing porous structure and dehydration.
  • Assessment of ligand accessibility using copper ions and lysozyme protein.

Main Results:

  • Pore wall thickness increased with monomer concentration.
  • Pore volume ranged from 70-93% and decreased with increasing monomer concentration.
  • Copper ion binding increased linearly with monomer concentration, indicating uniform ligand accessibility.
  • Lysozyme binding peaked at 18% monomer concentration, suggesting surface-limited accessibility for large molecules.

Conclusions:

  • Monomer concentration is a key factor in controlling pAAm-cryogel architecture.
  • Ligand accessibility in cryogels is dependent on the size of the target molecule.
  • These findings are crucial for designing pAAm-cryogels for specific separation or binding applications.