⚛️ 𝗠𝗲𝗰𝗵𝗮𝗻𝗶𝗰𝗮𝗹 𝗺𝗲𝘁𝗮𝗺𝗮𝘁𝗲𝗿𝗶𝗮𝗹𝘀 𝗮𝗿𝗲 𝗮𝗿𝘁𝗶𝗳𝗶𝗰𝗶𝗮𝗹𝗹𝘆 𝗲𝗻𝗴𝗶𝗻𝗲𝗲𝗿𝗲𝗱 𝗺𝗮𝘁𝗲𝗿𝗶𝗮𝗹𝘀 𝘄𝗶𝘁𝗵 𝗺𝗲𝗰𝗵𝗮𝗻𝗶𝗰𝗮𝗹 𝗽𝗿𝗼𝗽𝗲𝗿𝘁𝗶𝗲𝘀 𝗱𝗲𝗳𝗶𝗻𝗲𝗱 𝗯𝘆 𝘁𝗵𝗲𝗶𝗿 𝘀𝘁𝗿𝘂𝗰𝘁𝘂𝗿𝗲. 𝗧𝗵𝗲𝘆 𝗮𝗿𝗲 𝘂𝘀𝗲𝗱 𝗳𝗼𝗿 𝗲𝗮𝗿𝘁𝗵𝗾𝘂𝗮𝗸𝗲 𝗱𝗮𝗺𝗮𝗴𝗲 𝗽𝗿𝗲𝘃𝗲𝗻𝘁𝗶𝗼𝗻, 𝘁𝘂𝗻𝗲𝗮𝗯𝗹𝗲 𝗺𝗲𝗰𝗵𝗮𝗻𝗶𝗰𝗮𝗹 𝗽𝗿𝗼𝗽𝗲𝗿𝘁𝗶𝗲𝘀 𝗼𝗳 𝗼𝗯𝗷𝗲𝗰𝘁𝘀 𝗮𝗻𝗱 𝗺𝗲𝗰𝗵𝗮𝗻𝗶𝗰𝗮𝗹 𝗲𝗻𝗲𝗿𝗴𝘆 𝗵𝗮𝗿𝘃𝗲𝘀𝘁𝗶𝗻𝗴.

➨ 🏢 𝗦𝗲𝗶𝘀𝗺𝗶𝗰 𝗺𝗲𝘁𝗮𝗺𝗮𝘁𝗲𝗿𝗶𝗮𝗹𝘀: seismic metamaterials use human-made structures located on or near the earth’s surface that “cloak” the buildings to protect them from seismic waves. Sources of these waves are earthquakes, mining activity and explosions. The seismic damage can cause significant adverse effects on telecommunications, police, healthcare, education, food (including water), shelter and clothing. Incorporating seismic metamaterials while designing smart cities can minimise the fatal consequences of seismic waves in society.

➨ 🏛️ 𝗣𝗲𝗻𝘁𝗮𝗺𝗼𝗱𝗲 𝗺𝗲𝘁𝗮𝗺𝗮𝘁𝗲𝗿𝗶𝗮𝗹𝘀: pentamode metamaterials can deform while their volume remains unchanged. These microstructured materials have tunable mechanical properties that allow them to be the building blocks of large-scale structures. The mechanical properties of these larger structures derive from the original building blocks, which represent a new frontier in smart buildings and transportation.

➨ 🛩️ 𝗔𝘂𝘅𝗲𝘁𝗶𝗰 𝗺𝗲𝘁𝗮𝗺𝗮𝘁𝗲𝗿𝗶𝗮𝗹𝘀: auxetic metamaterials have been studied over the last decade to harvest energy from mechanical stress. These materials use piezoelectricity to convert mechanical deformation into electrical energy that can be stored in batteries. Piezoelectric auxetic metamaterials can repurpose the energy lost in many daily situations, such as vibrations from a bridge, wind turbine and aeroplane rotor.