Nanotechnology

Nanotechnology is the science of working with very tiny pieces of matter—so small that you can only see them with special microscopes. These pieces are measured in nanometers, which are billionths of a meter. At this size, materials can behave in surprising ways, very different from larger objects we see every day.

This field brings together many areas of science and engineering, like chemistry, biology, physics, and materials science. Researchers use nanotechnology to create new substances and inventions, such as better medicines, faster computers, and stronger materials for everyday products.

While nanotechnology holds great promise for improving many parts of our lives, it also raises important questions. Scientists are carefully studying how these tiny materials might affect our health and the environment. Some people are discussing whether special rules are needed to make sure nanotechnology is used safely.

Origins

Main article: History of nanotechnology

Nanotechnology started with ideas from physicist Richard Feynman in 1959. He talked about moving atoms to build very small things. The word "nanotechnology" was first used in 1974 by Norio Taniguchi. It became well-known in 1986 when K. Eric Drexler wrote a book about it.

In the 1980s, new tools like the scanning tunneling microscope allowed scientists to see and move single atoms. Important discoveries, such as buckminsterfullerene and carbon nanotubes, helped grow the field. Governments began supporting nanotechnology research, which led to many new products and studies.

Fundamental concepts

Nanotechnology is the science of working with very tiny things. It involves making and using small structures and machines that are so tiny you need special tools to see them.

One nanometer (nm) is one billionth of a meter, or 10⁻⁹, of a meter. This is very small — for example, a DNA molecule is about 2 nanometers wide, and tiny bacteria are around 200 nanometers long. Nanotechnology works with sizes from 1 to 100 nanometers. At this size, materials can have special properties that they don’t have when they are bigger.

There are two main ways to build things in nanotechnology. In the “bottom-up” way, tiny parts come together by themselves, like building blocks fitting into place. In the “top-down” way, scientists start with bigger pieces and shape them into very small devices. These tiny structures can behave differently from larger pieces of the same material, which makes them useful for many new technologies.

Research

Nanotechnology is the study of very tiny materials and structures, usually between 1 and 100 nanometers in size. At this size, materials can have special properties that bigger materials do not have.

Many areas of science study materials that have unique properties because they are very small. These nanomaterials can be used in many ways, such as in medicine for delivering drugs or in solar cells to help create energy. Scientists use different methods to build these tiny structures, either by putting small parts together or by shaping larger materials into smaller forms. These tiny materials and devices have many possible uses in technology and medicine.

Tools and techniques

The atomic force microscope and the scanning tunneling microscope are special tools that help scientists see and work with very tiny things, even smaller than a human hair. These tools have sharp tips that can touch and move tiny particles.

Scientists use different ways to create tiny structures. Some ways shape materials from the top down, like using tiny stamps to make patterns. Other ways build structures from the bottom up, adding atoms one by one, like building with Lego blocks. These techniques help make new materials and devices for many uses, including in medicine.

Applications

Main article: List of nanotechnology applications

Nanotechnology has many useful applications. By 2008, more than 800 products used nanotechnology, with new ones appearing often. These products include sunscreen, cosmetics, and food that use special materials. Nanotechnology is also used in clothing to make it last longer and stay cool. Band-aids with silver can help cuts heal faster.

In cars, nanotechnology helps make batteries better. It can also improve sports equipment like tennis balls and golf balls. Computers and video game consoles might become faster and cheaper because of nanotechnology. In medicine, nanotechnology helps deliver drugs better and can even help create new tissues in the body. These tiny tools are making many areas of life better.

Implications

Main article: Implications of nanotechnology

Nanotechnology works with very tiny particles that can have special properties. Some people worry about how these tiny particles might affect our health and the environment if they are used in many products. Researchers are studying these possible effects to keep us safe.

There are concerns that tiny particles in products, like those in socks, might accidentally harm nature when they end up in wastewater. Some studies with animals have shown that breathing in these tiny particles can cause problems in the lungs. This is why some experts think we need careful rules and more research before using nanotechnology in many products.

Regulation

Main article: Regulation of nanotechnology

People have talked about making better rules to keep nanotechnology safe for everyone and the environment. Some say the current laws don’t cover all parts of nanotechnology well enough. Experts suggest more research and careful steps to make sure products are safe before they are sold. One report said companies should explain how they will handle products when they are no longer used, to lower any possible risks to people or nature.