One of the problems related to making nano-machines on a scale of molecules is how to put such small amounts of materials exactly where they belong.
A research team at the University of Berkeley has developed a method that allows the transfer of molten metal globules of only 30 nanometers. One nanometer equals 10 hydrogen atoms).
The method developed by the Berkeley researchers involves placing a metal bead on the tip of a nanotube. By applying a voltage, the blood cell can be moved around the outside of the tube.
So far, individual atoms have been displaced through the tip of highly advanced microscopes, too complex a method for the practical production of nanomachines. However, this new technological advance by Berkeley scientists represents another step towards mass manufacturing of nano-devices.