A variety of hollow structures with unique morphologies were manufactured with a rotational spinning technique. Phase separation of soluble solutions or emulsions was induced within a filled mold as it was being rotated about one of its axis. The density difference between phases results in sediment...http://www.google.co.uk/patents/US6969480?utm_source=gb-gplus-sharePatent US6969480 - Method of producing structures using centrifugal forces
