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Contents:

1. Nanotechnology
2. Types of Nanotechnologies

1. Nanotechnology

 Nanotechnology deals with the study, development and practical application of structures and devices at molecular scale (between 1 and 100 nanometers, one nanometer is equivalent to 1 in 10^-9 meters). "Nano" is a Greek prefix, which signifies a "billionth" (one billionth of a meter is the unit of measure in the field of nanotechnology). An atom is smaller than a nanometer, but a molecule can be larger.

  2. Types of Nanotechnologies:

A) Top-Down (larger to smaller size): Here, the mechanisms and structures are miniaturized to a nanometric scale. This approach is widely following in the miniaturization of electronic products, and electronic components manufacturing processes. 

 B) Bottom-Up (Smaller to larger size): Here, we begin with a nanometric structure such as a molecule, and through a process of molecular level assembly, a bigger product is generated.   The ultimate step for Bottom-Up Nanotechnology is called "molecular nanotechnology", or "molecular manufacturing". Since the product is made by placing each molecule meticulously in a given position, many believe that the bottom-up approach is the true nano technology, where further miniaturization is not possible.

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