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Related Concept Videos

Aquaporins01:25

Aquaporins

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Aquaporins or AQPs are a family of integral membrane proteins whose primary function is to transport water, while some called aquaglyceroporins also transport glycerol. In addition, aquaporins have also been suspected to be involved in transporting volatile substances, such as carbon dioxide and ammonia, across membranes. Such AQPs that act as gas channels are often highly expressed in cells involved in the gaseous exchange, such as red blood cells, epithelial cells, and pulmonary capillaries.
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Detergent Purification of Membrane Proteins01:18

Detergent Purification of Membrane Proteins

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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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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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Ion Exchange01:17

Ion Exchange

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Ion exchange chromatography separates charged molecules from a solution by reversibly exchanging them with mobile, or 'active', ions associated with the oppositely charged stationary phase. This method can be used to separate ions, soften and deionize water, and purify solutions. The polymers comprising the ion-exchange column are high-molecular-weight and chemically stable polymers, crosslinked to be porous and essentially insoluble. They are also functionalized with either acidic or...
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The Significance of Membrane Transport01:44

The Significance of Membrane Transport

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The transport of solutes across the cell membrane is essential for metabolic processes, like maintaining cell size and volume, generating the action potential, exchanging nutrients and gases, etc. Membrane transport can be either passive or active. It can be simple diffusion, facilitated, or mediated transport aided by transport proteins such as transporters and channels.
Transporters facilitate either an active or passive movement of solutes. They can allow a single-molecule transport down its...
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Facilitated Transport01:19

Facilitated Transport

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The chemical and physical properties of plasma membranes cause them to be selectively permeable. Since plasma membranes have both hydrophobic and hydrophilic regions, substances need to be able to transverse both regions. The hydrophobic area of membranes repels substances such as charged ions. Therefore, such substances need special membrane proteins to cross a membrane successfully. In  facilitated transport, also known as facilitated diffusion, molecules and ions travel across a...
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Synthesis of Hydrogels with Antifouling Properties As Membranes for Water Purification
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Synthesis of Hydrogels with Antifouling Properties As Membranes for Water Purification

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Highly Permeable Polymer Membranes Containing Directed Channels for Water Purification.

Hongyang Ma1, Christian Burger1, Benjamin S Hsiao1

  • 1Department of Chemistry, Stony Brook University, Stony Brook, New York 11794-3400, United States.

ACS Macro Letters
|May 24, 2022
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Summary
This summary is machine-generated.

Researchers developed novel nanocomposite membranes with directed water channels for enhanced water purification. These membranes utilize aligned nanomaterials to improve water flow while blocking contaminants, offering a promising advancement in filtration technology.

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Area of Science:

  • Materials Science
  • Chemical Engineering
  • Environmental Science

Background:

  • Conventional membranes face limitations in balancing high permeability and effective contaminant rejection.
  • Nanocomposite materials offer potential for tailored transport properties in separation technologies.

Purpose of the Study:

  • To introduce a novel concept for enhancing membrane permeability using directed water channels within nanocomposite barrier layers.
  • To demonstrate the feasibility of this approach for water purification applications.

Main Methods:

  • Fabrication of nanocomposite barrier layers with directed water channels at the interface of nanofibrous scaffolds and polymer matrices.
  • Embedding overlapped oxidized multiwalled carbon nanotubes into poly(vinyl alcohol) (PVA) for ultrafiltration (UF) demonstration.
  • Conceptual extension to utilize cellulose nanofibers in highly cross-linked polymer barrier layers for thin-film nanofibrous composite (TFNC) membranes.

Main Results:

  • Demonstrated directed water transport and contaminant exclusion using carbon nanotube-PVA nanocomposite membranes for UF.
  • Anticipated significant permeation flux increase in TFNC membranes compared to conventional thin-film composite (TFC) membranes.
  • Maintained rejection capability while enhancing water flux.

Conclusions:

  • Nanocomposite barrier layers with directed water channels represent a viable strategy for high-performance water purification membranes.
  • The proposed approach using cellulose nanofibers offers a cost-effective and environmentally friendly alternative for advanced filtration.
  • This technology holds promise for significantly improving water treatment efficiency and capacity.