Nanotechnology, in its original sense, refers to the projected ability to construct items from the bottom up, using techniques and tools being developed today to make complete, high performance products. Nanotechnology is the engineering offunctional systems at the molecular scale.
The Meaning K. Eric Drexler popularised the word 'nanotechnology' in the 1980's, by talking about building machines on the scale of molecules, a few nanometers widemotors, robot arms, and even whole computers, far smaller than a cell.
Much of the work being done today that carries the name 'nanotechnology' is not nanotechnology in the original meaning oftheword. Nanotechnology, in its traditional sense, means building things from the bottom up, with atomic precision.
This theoretical capability was envisioned as early as 1959 by the renowned physicist Richard Feynman.Four Generations
2000 1st. Passive Nanostructures First generation products: (a) aerosols, colloids (b) coatings, nanoparticies reinforced composites, polymers, ceramics, nanostructured metals, etc.
2005 Active Nanostructures Second generation products: (a) bio-active like targeted drugs, bio-devices (b) Physico-chemical active - 3D transistors, actuators, etc.
2010 Nanosystems Third generation products: (a) guided assembling, 3D networking, robotics 2015/20Moiecuiar Nanosystems Fourth generation products: molecular devices, atomic design, etc.
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