Sunday, September 27, 2009
Nano technology is a modern advancement in science where the working parts of the device in question are in the order of 10−9m. Nanotech is studied in various ways of which the important ones are top down approach-These seek to create smaller devices by using larger ones to direct their assembly; bottom up approach-These seek to arrange smaller components into more complex assemblies; the nanomaterials per se-This includes subfields which develop or study materials having unique properties arising from their nanoscale dimensions; and functional approach-These seek to develop components of a desired functionality without regard to how they might be assembled.
The atomic force microscope (AFM) and the Scanning Tunneling Microscope (STM) are two early versions of scanning probes that launched nanotechnology.Another group of nanotechnological techniques include those used for fabrication of nanowires.
Health matters are of a concern nowadays. A major study published more recently in Nature Nanotechnology suggests some forms of carbon nanotubes – a poster child for the “nanotechnology revolution” – could be as harmful as asbestos if inhaled in sufficient quantities.
Modern technological advancement in this field is seen with respect to medical sciences where nanorobots enter the body and help in selectively destroying tumorous cells. Similarly micro surgeries are easily possible which is an advancement in minimally invasive procedures.
In the field of astrophysics, newer batteries are being developed using nanotech which could save more energy and hence can power the satellites for a longer duration.
Next to be mentioned is nanotubular advancement. Columns, pipes, bearings and springs are a few common ways that engineers have made use of the geometric shape known as a 'cylinder.' The utility of this shape is apparent in architecture, plumbing and mechanical devices. Carbon nanotubes are molecular cylinders that are rapidly extending our ability to fabricate nanoscale devices by providing molecular probes, pipes, wires, bearings and springs.
There are mmany more advancements and i urge all to contribute in further increasing our knowledge with regard to this field of science.
Posted by Dr. A M Farooqi at 7:06 PM