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Related Concept Videos

Pore Size Distribution01:23

Pore Size Distribution

92
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...
92

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Pore Structure Modulation in Kirigamic Zeolitic Imidazolate Framework.

Joohan Nam1, Eunji Jin2, Leila Abylgazina2

  • 1Department of Chemistry, Ulsan National Institute of Science and Technology (UNIST), Ulsan, 44919, Republic of Korea.

Angewandte Chemie (International Ed. in English)
|November 6, 2024
PubMed
Summary
This summary is machine-generated.

Researchers discovered a crystalline zeolitic imidazolate framework (ZIF) that exhibits kirigami folding mechanics at the molecular level. This flexible ZIF material demonstrates unique pressure- and guest-induced responses, revealing novel foldable properties.

Keywords:
KirigamiMechanical PropertiesMetal–Organic FrameworksPore DimensionalityZeolitic Imidazolate Frameworks

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Area of Science:

  • Materials Science
  • Crystallography
  • Chemical Engineering

Background:

  • Paper crafts like origami and kirigami inspire novel scientific and engineering applications.
  • Kirigami principles enable the design of 3D mechanical linkages with unique properties.
  • Zeolitic imidazolate frameworks (ZIFs) are porous crystalline materials with diverse applications.

Purpose of the Study:

  • To report a novel crystalline zeolitic imidazolate framework (ZIF) exhibiting kirigami-inspired folding mechanics.
  • To investigate the pressure- and guest-induced responses of this ZIF material.
  • To reveal molecular-level foldable mechanics in flexible ZIFs.

Main Methods:

  • Synthesis of a crystalline zeolitic imidazolate framework (ZIF) with a double-corrugation surface (DCS) pattern.
  • Application of pressure and guest molecules to induce responses in the ZIF.
  • Analysis of the ZIF's mechanical properties and pore dimensionality changes.

Main Results:

  • The ZIF material displays folding mechanics consistent with kirigami tessellation.
  • Imidazolate linkers within the ZIF act as molecular hinges, controlling pore structure.
  • The ZIF exhibits responses resembling a check valve-adapted mechanical manifold.

Conclusions:

  • A novel kirigami tessellation mechanism is discovered within a flexible ZIF at the molecular level.
  • This finding opens new avenues for designing responsive materials with tunable mechanical properties.
  • The study highlights the potential of kirigami principles in advanced materials design.