# 3D‐MOF‐Lattice Inspired Programmable Metamaterials Based on Reconfigurable Polyhedral Origami

## TL;DR

This paper introduces a new type of metamaterial inspired by MOF crystal structures, enabling customizable mechanical properties for advanced applications.

## Contribution

A reconfigurable metamaterial design strategy inspired by MOFs, enabling tunable mechanical properties and programmable performance.

## Key findings

- Modular units with tunable stiffness and adjustable Poisson's ratios were developed.
- Modules exhibit diverse mechanical responses like quasi-zero stiffness and bistability.
- Programmable metamaterial networks enable customizable mechanical performance.

## Abstract

Metamaterials have attracted significant attention due to their unconventional mechanical properties. However, a major limitation of conventional metamaterials lies in the fixed and uniform microstructures, limiting their ability to realize diverse functionalities. Inspired by the network chemistry of the 3D architectures of metal–organic frameworks (MOFs) crystal networks, a reconfigurable design strategy based on polyhedral origami patterns is proposed. Leveraging intrinsic bifurcation behavior, a set of modular units with tunable stiffness and adjustable Poisson's ratios is developed. Both experimental and theoretical investigations confirm that these modules exhibit diverse mechanical responses, including quasi‐zero, positive stiffness, bistability, and a continuously tunable Poisson's ratio spanning negative to positive values. By assembling modules in desirable modes, a programmable metamaterial network with customizable mechanical performance is presented. This approach provides a versatile platform for designing multifunctional mechanical metamaterials and offers practical value in applications such as advanced shock‐absorbing systems, enhancing versatility and adaptability.

A novel metamaterial design strategy: inspired by MOFs crystal networks, creating reconfigurable modular polyhedral units to overcome the limitations of traditional materials. These modules exhibit adjustable stiffness, bistability, and Poisson's ratio that can be adjusted from negative to positive values. This programmable network allows for customized mechanical performance, opening up new possibilities for advanced applications such as adaptive damping systems.