2. INTRODUCTION Definition: nanotechis the study of the control of matter on an atomic and molecular scale. Nanotechnology uses techniques, processes and materials at the supramolecular level, approximately in a range between 1-100 nanometers (nm), in order to create new properties and to stimulate particular desired functionalities.
7. Application of carbon nanotubes Carbon Nanotubes in Batteries and Capacitors Carbon Nanotubes in Fuel Cell Applications carbon nanotubes with biological systems can significantly improve medical science — especially diagnostics and disease treatment. Carbon nanotubes and graphene exhibit extraordinary electrical properties for organic materials, and have a huge potential in electrical and electronic applications such as sensors, semiconductor devices, displays, conductors and energy conversion devices (e.g., fuel cells, harvesters and batteries). Carbon Nanotubes May Exhibit High Thermal Conductivity
8. Molecular manufacturing molecular manufacturing, is a term given to the concept of engineered nanosystems (nanoscale machines) operating on the molecular scale. It is especially associated with the concept of a molecular assembler, a machine that can produce a desired structure or device atom-by-atom using the principles of mechanosynthesis. molecular manufacturing also has the potential to revolutionize medicine. For example, sensors that are smaller than blood cells could be produced inexpensively. When released into a patient's blood stream in large numbers, these sensors could provide very accuratediagnoses. Nanorobots could be built using molecular manufacturing to perform surgicalprocedures in a more precise way.
9. Nanomaterials Nanomaterials is a field which takes a materials science-based approach to nanotechnology. It studies materials with morphological features on the nanoscale, and especially those which have special properties stemming from their nanoscale dimensions. Nanoparticles or nanocrystals made of metals, semiconductors, or oxides are of particular interest for their mechanical, electrical, magnetic, optical, chemical and other properties. Nanoparticles have been used as quantum dots and as chemical catalysts.
11. Properties of nanomaterials large fraction of surface atoms high surface energy spatial confinement reduced imperfections high Young’s modulus and high tensile strength improve adhesion, durability, and abrasion resistance extreme high thermal conductivity in axial directions,leaving high anisotropy in the heat transport in the materials
12. Application of nanomaterials Sunscreens and Cosmetics : Nanosized titanium dioxide and zinc oxide are currently used in some sunscreens, as they absorb and reflect ultraviolet (UV) rays and yet are transparent to visible light and so are more appealing to the consumer. Composites : An important use of nanoparticles and nanotubes is in composites, materials that combine one or more separate components and which are designed to exhibit overall the best properties of each component. This multi-functionality applies not only to mechanical properties, but extends to optical, electrical and magnetic ones Phosphors for High-Definition TV Elimination of Pollutants High-Sensitivity Sensors
14. Nanotechnology in Medicine Employing nano-particles to deliver drugs, heat, light or other substances to specific cells in the human body. . Engineering particles to be used in this way allows detection and/or treatment of diseases or injuries within the targeted cells, thereby minimizing the damage to healthy cells in the body. Development nanocrystalline silver is already being used as a antimicrobial agent in the treatment of wounds Nanotubes used in broken bones to provide a structure for new bone material to grow. Nanoparticles that can attach to cells infected with various diseases and allow a doctor to identify, in a blood sample, the particular disease. Nanoshells that concentrate the heat from infrared light to destroy cancer cells with minimal damage to surrounding healthy cells. For a good visual explanation of nanoshells
18. Energy and Nanotechnology Used in fuel cells Nanotechnology is being used to reduce the cost of catalysts used in fuel cells to produce hydrogen ions from fuel such as methanol and to improve the efficiency of membranes used in fuel cells to separate hydrogen ions from other gases such as oxygen. Used in solar cells
19. Nanotechnology and Space nanosensors and nanorobots could improve the performance of spaceships, spacesuits, and the equipment used to explore planets and moons nanomaterials make lightweight solar sails and a cable for the space elevator Using carbon nanotubes to make the cable needed for the space elevator, a system which could significantly reduce the cost of sending material into orbit
20. Food and Nanotechnology Nanotechnology is having an impact on several aspects of food science, from how food is grown to how it is packaged,that will make a difference not only in the taste of food, but also in food safety, and the health benefits that food delivers. Clay nanocomposites are being used to provide an impermeable barrier to gasses such as oxygen or carbon dioxide in lightweight bottles, cartons and packaging films Storage bins are being produced with silver nanoparticles embedded in the plastic. The silver nanoparticles kill bacteria from any material that was previously stored in the bins, minimizing health risks from harmful bacteria.
