Thanks for the answer. I am also think that, but from the laws of surface area of spherical = 4πr2 while cubic = 6l2 if l=r, 4π > 6, so spherical is higher.If we look to number of edges, cubic is high.
I guess that the relationship between Surface area (m2/g) and particle size is only follow for very low S.S. (very high particle size). At least in typical powder solids (I mostly have experience with oxides) if you go above 10-20 m2/g, the particle size/shape would predict S.S. exceeding the experimental result by a minimum factor of 2. Attachement among particles is as important as particle size to interpret surface area in a significant number of solids.
@ Hani but Sphere volume is 4/3 pi r3 and cube has a3 (a=r) and 4/3 Pi r3 >> a3. Hence, again matteo leoni is coorect. always consider specific surface are with respect to volume.
Well , thermodynamically speaking, the sphere has the lowest surface area in comparison to cubes, squares, rectangular ,triangle and so on. Because the work or energy required to form the sphere is lower than that required to form other geometries for the same quantity of the material. dW (Work) directly proportional with dA(Area). Accordingly, the bubbles, the cavities and the liquid droplets are spherical.
But I read in Z.L.Wang book under title " characterization of nanophase" page 58 that pt nanocrustals with cubic morphology shows transformation to spherical when temperature increase to 500C. The study was taken by in-situ TEM.
So, how can you explain this information together?