The surface free energy of a particle (quasi- spherical in shape) is
Fs= 4 Pi x r2 x Gama,
The surface free energy of a rode is : Fs= 2 Pi x r L x Gama, where r denotes the radius , r. of the spherical particle, or diameter of base of the rode, respectively. L is the length, and Gama is the specific (Helmholtz) free energy
There is critical radius rC=- Gama Surface / Gibbs Volumetric Specific energy, above which the rode and spherical particles start to grow along the radius vector.