2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/216959It is shown that nanotubes with thicker walls can be grown from strongly bonded multi-layered structures only in accord with some basic crystallographic principles. Either the diameters of such tubes remain large in comparison with the thicknesses of their walls, or new bulk structures are formed.5 pages, 1 figureMaterials Sciencetext