Pore Structure Modulation in Kirigamic Zeolitic Imidazolate Framework

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.