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Polymers02:34

Polymers

40.9K
The word polymer is derived from the Greek words “poly” which means “many” and “mer” which means “parts”. Polymers are long chains of molecules composed of repeating units of smaller molecules, known as monomers. They either occur naturally, such as DNA and proteins, or can be constructed synthetically, like plastics. They have varied structural characteristics, such as linear chains, branched chains, or complex networks, that contribute to the...
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Polymers02:34

Polymers

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Factors Affecting Dissolution: Polymorphism, Amorphism and Pseudopolymorphism01:21

Factors Affecting Dissolution: Polymorphism, Amorphism and Pseudopolymorphism

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Polymorphism refers to the existence of a drug substance in multiple crystalline forms, known as polymorphs. Recently, this term has been expanded to include solvates (forms containing a solvent), amorphous forms (non-crystalline forms), and desolvated solvates (forms from which the solvent has been removed).
Some polymorphic crystals possess lower aqueous solubility than their amorphous counterparts, leading to incomplete absorption. For instance, the oral suspension of Chloramphenicol, which...
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Polymer Classification: Architecture01:14

Polymer Classification: Architecture

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Polymers are classified as linear or branched on the basis of their chain architecture. The polymer chains in linear polymers have a long chain-like structure with minimal to no branching at all. Even if a polymer features large substituent groups on the monomer, which appear as branches to the skeleton, it is not considered a branched polymer. A branched polymer contains secondary polymer chains that arise from the main polymer chain. The branching occurs when the polymer growth shifts from...
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Polymer Classification: Crystallinity01:21

Polymer Classification: Crystallinity

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Unlike ionic or small covalent molecules, polymers do not form crystalline solids due to the diffusion limitations of their long-chain structures. However, polymers contain microscopic crystalline domains separated by amorphous domains.
Crystalline domains are the regions where polymer chains are aligned in an orderly manner and held together in proximity by intermolecular forces. For example, chains in the crystalline domains of polyethylene and nylon are bound together by van der Waals...
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Polymer Classification: Stereospecificity01:26

Polymer Classification: Stereospecificity

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Polymerization generates chiral centers along the entire backbone of a polymer chain. Accordingly, the stereochemistry of the substituent group has a significant effect on polymer properties. Polymers formed from monosubstituted alkene monomers feature chiral carbons at every alternate position in the polymer backbone. Relative to the predominant orientation of substituents at the adjacent chiral carbons, the polymer can exist in three different configurations: isotactic, syndiotactic, and...
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Layer-by-layer Synthesis and Transfer of Freestanding Conjugated Microporous Polymer Nanomembranes
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Polymer-Derived Amorphous Aluminosilicate Nanomembranes for H2 Purification.

Vinh T Bui1, Amandine Tirino1, Ameya Manoj Tandel1

  • 1Department of Chemical and Biological Engineering, University at Buffalo, The State University of New York, Buffalo, New York 14260, United States.

ACS Nano
|February 2, 2026
PubMed
Summary
This summary is machine-generated.

Researchers developed scalable amorphous aluminosilicate nanomembranes for efficient hydrogen separation. This polymer-derived material offers superior selectivity and permeance, overcoming limitations of traditional zeolite membranes for gas purification.

Keywords:
H2 purificationatomic layer depositioncarbon captureorganosilica nanomembranespolymer-derived amorphous aluminosilicates

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Area of Science:

  • Materials Science
  • Chemical Engineering
  • Nanotechnology

Background:

  • Aluminosilicate zeolite membranes are effective for hydrogen separation but difficult to produce at scale.
  • Current fabrication methods for zeolite membranes are costly and complex, limiting practical applications.

Purpose of the Study:

  • To develop a scalable and cost-effective method for producing advanced nanomembranes for gas separation.
  • To combine the processability of polymers with the separation capabilities of aluminosilicates.

Main Methods:

  • Fabrication of thin-film composite membranes using polydimethylsiloxane.
  • Surface modification via oxygen plasma treatment to create polyorganosilica (POSi).
  • Few-cycle atomic layer deposition (ALD) using trimethylaluminum and water vapor to form amorphous aluminosilicates.

Main Results:

  • Achieved few-nanometer amorphous aluminosilicate layers with enhanced size-sieving properties.
  • Significantly increased H2/CO2 selectivity (39 to 200) and H2/CH4 selectivity (190 to 500) after three-cycle ALD.
  • Maintained high H2 permeance (210 GPU at 150 °C), outperforming existing state-of-the-art membranes.

Conclusions:

  • The developed two-step process enables rapid and scalable manufacturing of amorphous aluminosilicate nanolayers.
  • These nanomembranes offer superior performance for hydrogen/light gas separation.
  • The technology holds potential for catalysis and adsorption applications.