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PRESENTED BY
Neeraj Rawat

What is Nanotechnology?
 Nanotechnology is the engineering of functional systems at the molecular scale.

The Meaning of Nanotechnology
As nanotechnology became an accepted concept, the meaning of the word shifted to encompass the simpler kinds of nanometer-scale technology, their definition includes anything smaller than 100 nanometers with novel properties.

General-Purpose Technology
Nanotechnology is sometimes referred to as a general-purpose technology. That's because in its advanced form it will have significant impact on almost all industries and all areas of society.

Exponential Proliferation
Nanotechnology not only will allow making many high-quality products at very low cost, but it will allow making new nanofactories at the same low cost and at the same rapid speed. This unique (outside of biology, that is) ability to reproduce its own means of production is why nanotech is said to be an exponential technology.

Nanomaterials
The nanomaterials field includes subfields which develop or study materials having unique properties arising from their nanoscale dimensions.
Nanoscale materials are sometimes used in solar cells which combats the cost of traditional Silicon solar cells

Today's Nanotechnology
Nanotechnology is a term that has grown to cover a broad collection of mostly disconnected fields. Essentially, anything sufficiently small and interesting can be called nanotechnology. Much of it is harmless. 
Some nanoparticles have raised concerns about human toxicity or environmental damage. Nanoscale particles may be more chemically active and mobile than larger versions, and may be more persistent in the environment than many molecules

Center for Responsible Nanotechnology

Three are following fundamentals of nano technology

Assembler: A nano-robotic device controlled by an onboard computer that can use available chemicals to manufacture nanoscale products. It has been proposed that advanced designs could communicate, cooperate, and maneuver to build macroscale products. Assemblers are much more complex, and probably less efficient, than fabricators.

Autoproductivity: The ability of a system, under external control, to automatically produce an identical copy of itself.

Convergent assembly: A process of fastening small parts to obtain larger parts, then fastening those to make still larger parts, and so on; convergent assembly can be used to build a product from many, much smaller, components.
Diamondoid: Structures that resemble diamond in a broad sense, strong stiff structures containing dense, three dimensional networks of covalent bonds; diamondoid materials could be as much as 100 to 250 times as strong as titanium, and far lighter.

Fabricator: A small nano-robotic device that can use supplied chemicals to manufacture nanoscale products under external control. Fabricators could work together to build macroscale products by convergent assembly.

Grey goo: The name given to free-range self-replicating miniature machines that could, in theory, run out of control and cause severe damage to the biosphere.

LMNT: An abbreviation for limited molecular nanotechnology; a narrowly specified type of MNT, using only diamondoid reactions; much easier to achieve than general MNT, but with nearly equivalent appeal and impact. 
MNT: An abbreviation for molecular nanotechnology; refers to the concept of building complicated machines out of precisely designed molecules. To avoid confusion between this and today's nanoscale technologies, CRN generally favors the term 'molecular manufacturing’.

Macroscale: Larger than nanoscale; often implies a design that humans can directly interact with; too large to be built by a single assembler (one cubic micron of diamond contains 176 billion atoms).

Mechanochemistry: Chemistry accomplished by mechanical systems directly controlling the reactant molecules; the formation or breaking of chemical bonds under direct mechanical control.  [See How does 'mechanochemistry' work?]

Micron: One millionth of a meter, or about 1/25,000 of an inch.

Millimeter: One thousandth of a meter, or about 1/26 of an inch.
Molecular manufacturing (MM): The building of complex structures by mechanochemical processes.

Molecular nanotechnology (MNT): The ability to construct shapes, devices, and machines with atomic precision, and to combine them into a wide range of products inexpensively.

Nanofactory: A self-contained macroscale manufacturing system, consisting of many molecular manufacturing systems feeding a convergent assembly system.

Nanomechanical: Being mechanical and very small; for example, a robot that can manipulate single molecules.
Nanometer: One billionth of a meter; approximately the length of three to six atoms placed side-by-side, or the width of a single strand of DNA; the thickness of a human hair is between 50,000 and 100,000 nanometers.

Nanoscale: Significantly smaller than a micron; on the scale of large molecules; capable of interacting with molecules; capable of being built by a single assembler.

SNT: An abbreviation for structural nanotechnology; refers to integration of nanotech features into non-MNT products, also called nanomaterials.

Application area of nanotechnology
nano medicines
nano technology for cleaning water
nano technology for electronic gadgets
nano technology for cancer
nano technology for coating
nano technology for aerospace
nano technology for energy
nano technology for telecommunication and networking

the list is end less

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