- Related Topics:
- nanomedicine
- nanowire
- nanofabrication
- nanowhisker
- nanosensor
nanotechnology
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What is nanotechnology?
Nanotechnology involves manipulating matter on an atomic scale to manufacture materials and devices. Measured in nanometers (billionths of a meter), the nanoscale changes material properties due to quantum mechanical effects.
This interdisciplinary field includes physics, chemistry, biology, and engineering. Nanoengineered materials are already present in consumer products like stain-resistant clothing, sunscreens, and bandages.
Nanotechnology has the potential to revolutionize various sectors, including medicine, energy, and manufacturing, by creating stronger, lighter, and more efficient materials. However, it also poses challenges such as controlling atoms, developing new tools, and ensuring cost-effectiveness. There are also concerns about potential risks, such as the "grey goo" scenario, where self-replicating nanobots could destroy the biosphere.
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How small is a nanometer?
A nanometer is a unit of measure that equals one billionth of a meter. To put that in perspective, a human hair is about 80,000 nanometers thick. Atoms are roughly the same size, and approximately 50 million of them lined up would measure one centimeter.
Nanotechnology deals with matter at this scale, manipulating materials and devices at the atomic level to create materials with new properties. Nanotechnology is used to create stain-resistant clothing, sunscreens, and even bandages that prevent infection.
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What materials can be created using nanotechnology?
Nanotechnology allows for the creation of materials with unique properties by manipulating their nanostructure. This involves precise configurations of atoms, often from abundant elements like carbon, hydrogen, and silicon, to create materials tailored for specific applications.
Examples of materials created using nanotechnology:
* Nanocomposites Combining nanoparticles with other materials to enhance properties like strength, durability, and light conversion.
* Nanosensors Nanoscale materials and structures used for sensing, offering unprecedented speed and sensitivity in detecting chemical species or biological agents.
* Nanomaterials for filters Materials used for trapping heavy metals and pollutants from water.
* Advanced ceramics Materials with highly engineered microstructures and unique attributes achieved through controlled composition and processing.
* Nanoparticles Clusters of atoms or ions, often with exotic energy deposition systems, used to create materials with specific properties.3 Britannica SourcesCreated from Britannica articles using AI. AI can make mistakes, so verify using Britannica articles. -
How is nanotechnology used in medicine?
Nanomedicine applies nanotechnology to prevent, image, diagnose, monitor, treat, and regenerate biological systems. Nanoscale particles offer new options for drug delivery and therapies, as more than half of new drugs each year are not water-soluble, making them difficult to deliver. However, in nanosized particle form, these drugs can be transported to their destination more readily as conventional pills.
Nanoparticles can precisely deliver drugs to the right location in the body and release doses on a schedule for optimal treatment. This is done by attaching the drug to a nanosized carrier that releases medicine over time or when triggered. The surfaces of nanoscale carriers can also be treated to seek out and localize at a disease site, such as cancerous tumors.
Nanoparticles also enhance images of organs, tumors, and diseased tissues and help develop new therapy delivery methods.
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What are some risks or concerns related to nanotechnology?
Nanotechnology presents both opportunities and risks. A key concern involves the potential health and environmental risks from nanoparticles, due to their size and novel properties. Studies are underway to determine if nanoscale particles pose carcinogenic risks from inhalation and the possibility of nanoparticles crossing the blood-brain barrier.
Another risk is that out-of-control, self-replicating nanobots could consume resources needed for life, a scenario known as "grey goo". Conversely, nanoparticles can also transport chemical pollutants in water.
Despite the risks, nanomaterials may be useful in filters, bioconversion for energy, bioprocessing of food products, waste remediation, and pollution-control systems.
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How might nanotechnology change our lives in the future?
Nanotechnology's potential impact is far-reaching, affecting many areas of daily life. It may revolutionize manufacturing by using abundant elements to create nanostructured materials with specific properties, reducing waste and energy consumption.
In medicine, nanomedicine could lead to personalized treatments, targeted drug delivery, and regenerative medicine. Nanomaterials can also be used for water purification, environmental cleanup, and new types of sensors with ultrahigh sensitivity.
However, challenges remain in controlling atoms at the nanoscale and assembling them into complex systems. The potential health and environmental risks of nanoparticles also need to be addressed.
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News •
nanotechnology, the manipulation and manufacture of materials and devices on the scale of atoms or small groups of atoms. The “nanoscale” is typically measured in nanometres, or billionths of a metre (nanos, the Greek word for “dwarf,” being the source of the prefix), and materials built at this scale often exhibit distinctive physical and chemical properties due to quantum mechanical effects. Although usable devices this small may be decades away (see microelectromechanical system), techniques for working at the nanoscale have become essential to electronic engineering, and nanoengineered materials have begun to appear in consumer products. For example, billions of microscopic “nanowhiskers,” each about 10 nanometres in length, have been molecularly hooked onto natural and synthetic fibres to impart stain resistance to clothing and other fabrics; zinc oxide nanocrystals have been used to create invisible sunscreens that block ultraviolet light; and silver nanocrystals have been embedded in bandages to kill bacteria and prevent infection.
Possibilities for the future are numerous. Nanotechnology may make it possible to manufacture lighter, stronger, and programmable materials that require less energy to produce than conventional materials, that produce less waste than with conventional manufacturing, and that promise greater fuel efficiency in land transportation, ships, aircraft, and space vehicles. Nanocoatings for both opaque and translucent surfaces may render them resistant to corrosion, scratches, and radiation. Nanoscale electronic, magnetic, and mechanical devices and systems with unprecedented levels of information processing may be fabricated, as may chemical, photochemical, and biological sensors for protection, health care, manufacturing, and the environment; new photoelectric materials that will enable the manufacture of cost-efficient solar-energy panels; and molecular-semiconductor hybrid devices that may become engines for the next revolution in the information age. The potential for improvements in health, safety, quality of life, and conservation of the environment are vast.
At the same time, significant challenges must be overcome for the benefits of nanotechnology to be realized. Scientists must learn how to manipulate and characterize individual atoms and small groups of atoms reliably. New and improved tools are needed to control the properties and structure of materials at the nanoscale; significant improvements in computer simulations of atomic and molecular structures are essential to the understanding of this realm. Next, new tools and approaches are needed for assembling atoms and molecules into nanoscale systems and for the further assembly of small systems into more-complex objects. Furthermore, nanotechnology products must provide not only improved performance but also lower cost. Finally, without integration of nanoscale objects with systems at the micro- and macroscale (that is, from millionths of a metre up to the millimetre scale), it will be very difficult to exploit many of the unique properties found at the nanoscale.
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