the first few hours of synthesis, however most of it is persistent. Carbon nanofoam may have some application in spintronic devices which exploits electron spin as a further degree of freedom. Carbon nanofoam may be suitable for hydrogen storage due to its low density and high surface area. Preliminary experimentation has shown that hydrogen can be stored in the nanofoam at room temperature in a reversible process. Synthesis Carbon nanofoam clusters can be synthesized through high-repetition-rate laser ablation in inert gases such as argon. Short (fs), low-energy (µJ) pulses delivered at high rates of repetition (10 kHz – 100 MHz) generate carbon vapors for deposition. Ambient gas is heated from room temperature with the atomized carbon which leads to an increase in the partial density of the carbon in the chamber. In optimal conditions, the inert gas does not cool down but maintains its high temperature between cycles of formation. Subsequent cycles in the chamber are carried out at temperatures above the formation threshold temperature initiating sp2 bonding. The increase in density and temperature promotes favorable conditions for the formation of carbonaceous clusters. The rate of consumption exceeds the rate of evaporation by laser ablation and thus the formation is in a non-equilibrium state. See also Truncated order-7 triangular tiling References Allotropes of carbon Group IV semiconductors Nanomaterials Foams