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Related Concept Videos

Dialysis01:15

Dialysis

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...
Pore Size Distribution01:23

Pore Size Distribution

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...
Glomerular Filtration01:15

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The filtration membrane in the renal system is a highly specialized structure essential for filtering blood. It consists of glomerular capillaries and podocytes, forming a selective barrier that permits the passage of water and small solutes while restricting most plasma proteins and blood cells.
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Pore Transport and Ion-Pair Transport01:17

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Pore transport and ion-pair formation are critical mechanisms for the absorption and distribution of drugs in the body.
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Osmosis and Osmotic Pressure of Solutions

A number of natural and synthetic materials exhibit selective permeation, meaning that only molecules or ions of a certain size, shape, polarity, charge, and so forth, are capable of passing through (permeating) the material. Biological cell membranes provide elegant examples of selective permeation in nature, while dialysis tubing used to remove metabolic wastes from blood is a more simplistic technological example. Regardless of how they may be fabricated, these materials are generally...
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Size-Exclusion Chromatography

In size-exclusion chromatography (SEC), also known as molecular-exclusion or gel-permeation chromatography, molecules are separated based on their sizes. This technique is important for separating large molecules such as polymers and biomolecules. The two classes of micron-sized stationary phases encountered in SEC are silica particles and cross-linked polymer resin beads. Both materials are porous, but their pore sizes vary significantly.
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Three-Dimensionally Printed Microfluidic Cross-flow System for Ultrafiltration/Nanofiltration Membrane Performance Testing
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Permeability - Selectivity Analysis for Ultrafiltration: Effect of Pore Geometry.

Dharmesh M Kanani1, William H Fissell, Shuvo Roy

  • 1Department of Chemical Engineering, The Pennsylvania State University, University Park, PA 16802.

Journal of Membrane Science
|February 18, 2010
PubMed
Summary

Membrane pore geometry significantly impacts ultrafiltration performance. Slit-shaped nanopores offer superior selectivity and permeability compared to cylindrical pores, especially with uniform pore sizes.

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Area of Science:

  • Materials Science
  • Chemical Engineering
  • Nanotechnology

Background:

  • Ultrafiltration membrane performance is linked to pore size, but pore geometry effects below 100 nm remain unclear.
  • Understanding pore geometry's role in selectivity-permeability trade-offs is crucial for advanced membrane design.

Purpose of the Study:

  • To investigate the influence of pore geometry (slit vs. cylindrical) on ultrafiltration membrane performance.
  • To compare experimental data with theoretical models for nanoporous membranes.

Main Methods:

  • Fabrication of novel silicon membranes with uniform slit-shaped nanopores using photolithography and sacrificial oxide techniques.
  • Experimental testing of commercial and novel membranes for solute and solvent transport.
  • Comparison of experimental data with hydrodynamic models for cylindrical and slit pores.

Main Results:

  • Membranes with slit-shaped pores exhibit higher performance (selectivity at a given permeability) than those with cylindrical pores.
  • The performance advantage of slit pores diminishes with increased pore size distribution breadth.
  • Experimental data align with theoretical predictions for pore geometry effects.

Conclusions:

  • Pore geometry is a critical factor in optimizing ultrafiltration membrane performance.
  • Slit-shaped nanopores represent a promising design for enhanced selectivity and permeability.
  • Minimizing pore size distribution is key to maximizing the benefits of slit-shaped pores.