Top down and bottom-top approach
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The document discusses top-down and bottom-up approaches for preparing nano particles. The top-down approach involves constructing nano objects from larger entities without atomic level control, using larger devices to direct assembly. The bottom-up approach builds materials and devices from molecular components that self-assemble chemically using molecular recognition principles, arranging smaller components into more complex assemblies, such as using DNA base pairing to construct structures from DNA and other nucleic acids.
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What are the techniques used in nanomanifacturing What are th.pdf
What are the techniques used in nanomanifacturing ?
What are the techniques used in nanomanifacturing ?
Solution
Manufacturing at the nanoscale is known as nanomanufacturing. Nanomanufacturing involves
scaled-up, reliable, and cost-effective manufacturing of nanoscale materials, structures, devices,
and systems. It also includes research, development, and integration of top-down processes and
increasingly complex bottom-up or self-assembly processes.
In more simple terms, nanomanufacturing leads to the production of improved materials and new
products. As mentioned above, there are two basic approaches to nanomanufacturing, either top-
down or bottom-up. Top-down fabrication reduces large pieces of materials all the way down to
the nanoscale, like someone carving a model airplane out of a block of wood. This approach
requires larger amounts of materials and can lead to waste if excess material is discarded. The
bottom-up approach to nanomanufacturing creates products by building them up from atomic-
and molecular-scale components, which can be time-consuming. Scientists are exploring the
concept of placing certain molecular-scale components together that will spontaneously “self-
assemble,” from the bottom up into ordered structures.
Within the top-down and bottom-up categories of nanomanufacturing, there are a growing
number of new processes (techniques) that enable nanomanufacturing. Among these are:.
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Nanotechnology involves controlling and manipulating matter at the nanoscale (10-9 meters) to create new materials and devices. Some key applications of nanotechnology include transparent coatings using small, uniform nanoparticles; using nanopowder to prevent drug clumping; using carbon nanotubes to build electronic and mechanical devices and detect altered genes; and using nanostructures in biological applications like cancer detection while avoiding toxicity issues. Nanotechnology shows potential for improvements in areas like diagnostics through more sensitive testing that could examine tissues without altering them and perform multiple tests simultaneously.
Nano Technology
Nanotechnology involves creating and manipulating materials on an atomic or molecular scale. It can produce materials with novel properties due to their small size. The document discusses various applications of nanotechnology in areas like engineering, medicine, textiles and more. It also describes techniques for synthesizing and characterizing nanomaterials, such as top-down methods that break down bulk materials and bottom-up methods that build materials up atom by atom.
Nanotechnology by manish myst, ssgbcoet
This document provides an overview of nanotechnology, including what it is, its unifying themes, main approaches, and potential applications across diverse fields like medicine, communications, computing, and energy. Specifically, it defines nanotechnology as the production and manipulation of materials at the nanoscale (100 nanometers or less). It discusses how characterizing tools, nanoscale science, and molecular computations are common themes. The main approaches are bottom-up (building from molecular components) and top-down (constructing nano-objects from larger entities). Some early applications include sunscreens using titanium dioxide nanoparticles and stain-resistant clothing with nanolayers.
Nano technology 7 smnr report
Nanotechnology involves manipulating matter at the molecular level to build tiny devices and materials with novel properties. It could enable targeted cancer treatment using microscopic robots to detect and destroy cancer cells. Various tools like microscopes and manipulators allow working at the nanoscale. Applications include stronger and lighter materials, drug delivery, stain-resistant fabrics, flexible electronics, and cancer detection chips. While promising benefits, risks include environmental and economic disruption if not properly regulated.
Nanomanufacturing ppt
Nanomanufacturing involves producing materials and parts on the nanoscale using either top-down or bottom-up approaches. The top-down approach starts with large pieces of material and makes them smaller through techniques like lithography, while the bottom-up approach builds up structures atom by atom through self-assembly and deposition. Nanomanufacturing allows precise control at the atomic scale, which gives materials unique properties. Current applications include electronics, sensors, and information storage, while potential future applications could expand to fields like aviation, nanobots, and pharmaceuticals.
Nanotechnology
Nanotechnology involves manipulating matter at the nanoscale (1 billionth of a meter) to create new materials and devices. There are two main approaches to synthesizing nano-phase materials: top-down, which breaks down bulk materials into nano sizes, and bottom-up, which builds materials atom by atom. Electrospinning is a commonly used bottom-up technique to produce nanofibers less than 500 nm in diameter for applications such as filters, protective fabrics, and tissue scaffolds. Nanotechnology has applications in fields like electronics, energy, materials, medicine, and textiles. It promises to revolutionize industries and improve lives through targeted drug delivery, artificial organs, stronger/lighter materials, pollution cleanup, and more.
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What are the techniques used in nanomanifacturing What are th.pdf
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Petroleum is a dark colored, viscous liquid found below the earth's crust that is obtained through mining. It is a mixture of hydrocarbons that formed from the remains of ancient organisms over time under heat and pressure. Refining petroleum involves separating it into useful fractions through fractional distillation. This process involves heating crude oil in a tall distillation tower, which separates it into fractions with different boiling points like gasoline, kerosene, diesel and lubricating oil that are collected on different trays based on their volatility and used for various purposes. Straight run oils are also produced through this initial distillation process.
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Nano sensors exist naturally in biology, enabling senses like smell in animals and light detection in plants. Various animals like dogs have particularly strong senses of smell using nano sensors, while some fish can detect small vibrations in water. Certain bacteria and fungi are also able to make magnetic or metal nano particles, with some bacteria reducing metal ions inside cells to synthesize nanoparticles when added to buttermilk.
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Top down and bottom-top approach
- 1. TOP-DOWN APPROACH BOTTOM –TOP APPROACH PREPARATION OF NANO PARTICLES
- 2. TOP-DOWN APPROACH nano objects are constructed from larger entities without atomic level and control. These seek to create smaller devices by using larger ones to direct their assembly . many technologies that descended from conventional solid state metods for fabricating microprocessors are capable of creating features smaller than 100nm.
- 3. BOTTOM –TOP APPROACH materials and devices are built from molecular components which assemble themselves chemically by principles of molecular recoginiton . These seek to arranges smaller components into more complex assemblies . DNA nanotechnology utilises the specificity of Watson – Crick base pairing to construct well defined structures out of DNA and other nucleic acids.