Seminar report

1. Nanotechnology
Name: Abhishek Kumar
Roll No.: 11112739
Branch: 8 CSE A1

2. Definition
The branch of technology that deals
with dimensions and tolerances of
less than 100 Nano-metres,
especially the manipulation of
individual atoms and molecules.

3. Introduction of Nanotechnology
Nanotechnology ("nanotech") is the manipulation of matter on
an atomic, molecular, and supra-molecular scale. The earliest,
widespread description of nanotechnology referred to the particular
technological goal of precisely manipulating atoms and molecules for
fabrication of macro scale products, also now referred to as molecular
nanotechnology. A more generalized description of nanotechnology was
subsequently established by the National Nanotechnology Initiative,
which defines nanotechnology as the manipulation of matter with at
least one dimension sized from 1 to 100 nanometers.

4. History of Nanotechnology
 The concepts that seeded nanotechnology were first discussed in 1959
by renowned physicist Richard Feynman.
 The term "nano-technology" was first used by Norio Taniguchi in 1974,
though it was not widely known.
 Inspired by Feynman's concepts, K. Eric Drexler used the term
"nanotechnology" in his 1986.
 Emergence of nanotechnology as a field in the 1980s occurred through
convergence of Drexler's theoretical and public work, which
developed and popularized a conceptual framework for
nanotechnology.

5. Nanotechnology Applications
 Medicine
 Electronics
 Food
 Fuel Cells
 Solar Cells
 Space
 Fuels
 Better Air Quality
 Cleaner Water
 Chemical Sensors
 Sporting Goods
 Fabric

6. Applications of Nanoparticles

7. Fundamental Concept
 Nanotechnology is the engineering of functional systems at the molecular
scale. This covers both current work and concepts that are more advanced.
 Nanotechnology 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.
 One nanometer (nm) is one billionth, or 10−9, of a meter. By comparison,
typical carbon-carbon bond lengths
 The spacing between these atoms in a molecule, are in the range0.12–0.15
nm
 A DNA double-helix has a diameter around 2 nm.

8. Bottom-up Approaches
 These seek to arrange smaller components into more complex assemblies.
 DNA nanotechnology utilizes the specificity of Watson–Crick base pairing to
construct well-defined structures out of DNA and other nucleic acids.
 Approaches from the field of "classical" chemical synthesis (Inorganic and organic
synthesis) also aim at designing molecules with well-defined shape (e.g. bis-
peptides).
 More generally, molecular self-assembly seeks to use concepts of supra molecular
chemistry, and molecular recognition in particular, to cause single-molecule
components to automatically arrange themselves into some useful conformation.
 Atomic force microscope tips can be used as a nano scale "write head" to deposit a
chemical upon a surface in a desired pattern in a process called dip pen
nanolithography. This technique fits into the larger subfield of nanolithography.

9. Top-Down Approaches
 These seek to create smaller devices by using larger ones to direct their assembly.
 Many technologies that descended from conventional solid-state silicon
methods for fabricating microprocessors are now capable of creating features
smaller than 100 nm, falling under the definition of nanotechnology. Giant
magneto resistance-based hard drives already on the market fit this
description, as do atomic layer deposition (ALD) techniques. Peter
Grünberg and Albert Fert received the Nobel Prize in Physics in 2007 for their
discovery of Giant magneto resistance and contributions to the field of spintronics.
 Solid-state techniques can also be used to create devices known as Nano
electromechanical systems or NEMS, which are related to micro electromechanical
systems or MEMS.
 Focused ion beams can directly remove material, or even deposit material when
suitable precursor gasses are applied at the same time. For example, this
technique is used routinely to create sub-100 nm sections of material for analysis
in Transmission electron microscopy.
 Atomic force microscope tips can be used as a nano scale "write head" to deposit a
resist, which is then followed by an etching process to remove material in a top-
down method.

10. Functional Approaches
 These seek to develop components of a desired functionality without regard
to how they might be assembled.
 Molecular scale electronics seeks to develop molecules with useful electronic
properties. These could then be used as single-molecule components in a
nano electronic device. For an example see rotaxane.
 Synthetic chemical methods can also be used to create synthetic molecular
motors, such as in a so-called nano car.

11. Biomimetic Approaches
 Bionics or bio-mimicry seeks to apply biological methods and systems found in
nature, to the study and design of engineering systems and modern
technology. Bio-mineralization is one example of the systems studied.
 Bio-nano technology is the use of biomolecules for applications in
nanotechnology, including use of viruses and lipid assemblies. Nano
cellulose is a potential bulk-scale application.

12. Advantages of Nanotechnology
 To enumerate the advantages and disadvantages of nanotechnology, let us first run through
the good things this technology brings:
 Nanotechnology can actually revolutionize a lot of electronic products, procedures, and
applications. The areas that benefit from the continued development of nanotechnology
when it comes to electronic products include nano transistors, nano diodes, OLED, plasma
displays, quantum computers, and many more.
 Nanotechnology can also benefit the energy sector. The development of more effective
energy-producing, energy-absorbing, and energy storage products in smaller and more
efficient devices is possible with this technology. Such items like batteries, fuel cells, and
solar cells can be built smaller but can be made to be more effective with this technology.
 Another industry that can benefit from nanotechnology is the manufacturing sector that will
need materials like nanotubes, aerogels, nano particles, and other similar items to produce
their products with. These materials are often stronger, more durable, and lighter than those
that are not produced with the help of nanotechnology.
 In the medical world, nanotechnology is also seen as a boon since these can help with
creating what is called smart drugs. These help cure people faster and without the side
effects that other traditional drugs have. You will also find that the research of
nanotechnology in medicine is now focusing on areas like tissue regeneration, bone repair,
immunity and even cures for such ailments like cancer, diabetes, and other life threatening
diseases.

13. Disadvantages of Nanotechnology
 When tackling the advantages and disadvantages of nanotechnology, you will also need to
point out what can be seen as the negative side of this technology:
 Included in the list of disadvantages of this science and its development is the possible loss of
jobs in the traditional farming and manufacturing industry.
 You will also find that the development of nanotechnology can also bring about the crash of
certain markets due to the lowering of the value of oil and diamonds due to the possibility of
developing alternative sources of energy that are more efficient and won’t require the use of
fossil fuels. This can also mean that since people can now develop products at the molecular
level, diamonds will also lose its value since it can now be mass produced.
 Atomic weapons can now be more accessible and made to be more powerful and more
destructive. These can also become more accessible with nanotechnology.
 Since these particles are very small, problems can actually arise from the inhalation of these
minute particles, much like the problems a person gets from inhaling minute asbestos
particles.
 Presently, nanotechnology is very expensive and developing it can cost you a lot of money. It
is also pretty difficult to manufacture, which is probably why products made with
nanotechnology are more expensive.

14. Thanks