Andi's writeup

Researchers at the University of Toronto and Korea Advanced Institute of Science and Technology (KAIST) have developed carbon nanolattices with unprecedented strength-to-weight ratios using machine learning optimization[^{1]. The team achieved a specific strength of 2.03 MPa m³ kg⁻¹ at densities below 215 kg m⁻³, creating materials as strong as carbon steel but with the density of Styrofoam[}2].

The breakthrough came through multi-objective Bayesian optimization of lattice designs combined with two-photon polymerization 3D printing. This approach improved strength by 118% and Young's modulus by 68% compared to traditional designs[^{3]. By reducing strut diameters to 300 nm, the researchers produced high-purity pyrolytic carbon structures containing 94% sp²-bonded carbon[}3].

The team successfully scaled production using multi-focus two-photon polymerization to create millimeter-scale metamaterials containing 18.75 million nanolattice cells[^{3]. "If you were to replace components made of titanium on a plane with this material, you would be looking at fuel savings of 80 litres per year for every kilogram of material you replace," said Peter Serles, the study's first author[}4].

[^1]: 3D Printing Industry - Optimized Carbon Nanolattices Achieve Record Strength

[^2]: Technology Networks - Machine Learning Designs Materials As Strong As Steel and As Light As Foam

[^3]: Nature - Stiff, lightweight, and programmable architectured pyrolytic carbon lattices via modular assembling

[^4]: Science Daily - Strong as steel, light as foam: High-performance, nano-architected materials