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Related Concept Videos

Rotation of Asymmetric Top01:11

Rotation of Asymmetric Top

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By definition, a spherically symmetric body has the same moment of inertia about any axis passing through its center of mass. This situation changes if there is no spherical symmetry. Since most rigid bodies are not spherically symmetric, these require special treatment.
The relationship between the angular momentum of any rigid body and its angular velocity, both of which are vectors, involves the moment of inertia. The moment of inertia is a scalar quantity only for spherically symmetric...
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Asymmetric Lipid Bilayer01:35

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Biological membranes show uneven distribution of different types of lipids in the inner and outer layers, resulting in transverse asymmetric membranes. The treatment of the erythrocyte membrane with the enzyme phospholipase confirmed the asymmetric nature of the lipid bilayer. The enzyme hydrolyzes lipids into fatty acids and hydrophilic groups. The phospholipase acts only on the outer layer of the membrane, while the inner layer remains intact. The phospholipase treatment resulted in 80%...
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Reduction of Alkenes: Asymmetric Catalytic Hydrogenation02:17

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Catalytic hydrogenation of alkenes is a transition-metal catalyzed reduction of the double bond using molecular hydrogen to give alkanes. The mode of hydrogen addition follows syn stereochemistry.
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IR Spectrum Peak Splitting: Symmetric vs Asymmetric Vibrations01:08

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Identical bonds within a polyatomic group can stretch symmetrically (in-phase) or asymmetrically (out-of-phase). Similar to hydrogen bonding, these vibrations also influence the shape of the IR peak. Generally, asymmetric stretching frequencies are higher than symmetric stretching frequencies. For example, primary amines exhibit two distinct IR peaks between 3300–3500 cm−1 corresponding to the symmetric and asymmetric N-H stretching, while secondary amines exhibit a single...
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The Resting Membrane Potential01:21

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Introduction to Membrane Proteins01:16

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The cell membrane, or plasma membrane, is an ever-changing landscape. It is described as a fluid mosaic where various macromolecules are embedded in the phospholipid bilayer. Among the macromolecules are proteins. The protein content varies across cell types. For example, mitochondrial inner membranes contain ~76% protein content, while myelin contains ~18% protein content. Individual cells contain many types of membrane proteins—red blood cells contain over 50—and different cell...
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Automated Lipid Bilayer Membrane Formation Using a Polydimethylsiloxane Thin Film
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Automated Lipid Bilayer Membrane Formation Using a Polydimethylsiloxane Thin Film

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Next-Generation Asymmetric Membranes Using Thin-Film Liftoff.

Brian McVerry1, Mackenzie Anderson1, Na He1

  • 1Department of Chemistry and Biochemistry , University of California , Los Angeles , California 90095 , United States.

Nano Letters
|July 6, 2019
PubMed
Summary
This summary is machine-generated.

A new thin-film liftoff (T-FLO) technique allows fabrication of composite membranes using novel materials. This method enables advanced applications in water purification and gas separation.

Keywords:
gas separationmembrane fabricationnanofiltrationreverse osmosisthin film composite

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Area of Science:

  • Materials Science
  • Chemical Engineering
  • Separation Science

Background:

  • Thin-film composite membranes are crucial for various separation processes, including reverse osmosis and gas separation.
  • Traditional fabrication methods limit the choice of materials for the membrane's active layer.

Purpose of the Study:

  • To introduce a novel thin-film liftoff (T-FLO) technique for fabricating advanced composite membranes.
  • To enable the use of new materials in membrane active layers for enhanced separation performance.

Main Methods:

  • The T-FLO technique involves casting the active layer separately from the support layer.
  • A robust, covalently bound support layer is formed using a fiber-reinforced epoxy resin.
  • The composite membrane is then lifted off the substrate in water, yielding a freestanding asymmetric membrane.

Main Results:

  • Demonstrated fabrication of three novel T-FLO membranes for chlorine-tolerant reverse osmosis, organic solvent nanofiltration, and gas separation.
  • The T-FLO technique allows independent tuning of the active layer's thickness and chemistry.
  • The method supports the use of diverse materials like high-performance polymers, 2D materials, and metal-organic frameworks.

Conclusions:

  • The T-FLO technique provides a versatile platform for developing next-generation thin-film composite membranes.
  • This method facilitates the exploration of new materials for improved transport and selectivity in separation applications.
  • T-FLO opens avenues for innovative membrane designs in water treatment, organic solvent filtration, and gas separation.