where Δ𝜇 𝓁→𝑥𝑡𝑎𝑙 = 𝜇 𝓁 -𝜇 𝑥𝑡𝑎𝑙 is the difference in chemical potential between the metastable liquid and the stable crystal phase and is strictly positive in conditions where nucleation is thermodynamically favourable, and the system is supersaturated. The surface term instead scales as 𝑛 2∕3 , where 𝜎 ′ is the product of a shape factor, area per monomer adsorption site and the surface tension, 𝜎. A typical free energy profile for nucleation in the CNT framework is