Several questions about nanomaterials 15

Disadvantages: production: processing difficulty, complex process, high cost and difficult to promote in a large area.

Social hazards. The presence of nanomaterials (materials containing nanoparticles) is not a hazard in itself. Only some aspects of it are harmful, especially their mobility and enhanced reactivity. Only certain aspects of certain nanoparticles are harmful to living organisms or the environment.

Health problems. There are four ways for nanoparticles to enter the body: inhalation, swallowing, absorption from ** or intentional injection (or release by implants) during a medical procedure.

Once inside the human body, they are highly mobile. In some cases, they can even cross the blood-brain barrier.

The behavior of nanoparticles in organs is still a big topic that needs to be studied. Basically, the behavior of nanoparticles depends on their size, shape, and interaction activity with surrounding tissues. They can cause an "overload" of bacteriophage cells (cells that swallow and destroy foreign substances), triggering a defensive fever and lowering the body's immunity.

They may accumulate in organs because they are unable to degrade or degrade slowly. There is also a concern about the potential danger of their reaction with some biological processes in the human body. Due to the large surface area, nanoparticles exposed to tissues and liquids immediately adsorb the macromolecules they encounter.

This can affect the adjustment mechanisms of enzymes and other proteins, for example.

Environmental issues. The main concern is that nanoparticles may cause unknown harms.

Social risk. There are also sociological risks associated with the use of nanotechnology. At the level of instruments, the possibility of using nanotechnology in the military sphere is also included.

Examples of orange dust such as the MIT Soldier Nanotechnology Institute are researched to equip soldiers with implants or other means, as well as surveillance methods enhanced by nanodetectors.

"Nanometer" is the translation name of "nanometer", that is, nanometer, which is usually used.

nm". In physics, a nanometer is a unit of length, 1 nanometer to 10-9 meters. For comparison, a nanometer is only as long as 3 atoms.

The so-called nanomaterials refer to various solid ultrafine materials whose microstructure is modulated at least at the nanoscale (1 100 nm) in the one-dimensional direction, including zero-dimensional atomic clusters (aggregates of dozens of atoms) and nanoparticles. one-dimensional modulated nano-multilayer films; 2D modulated nanoparticle membranes (coatings); and three-dimensional modulated nanophase materials. Nanomaterials include nanoparticles and nanosolids: nanoparticles are usually 1 nm and can only be seen with an electron microscope; Nano-solid system nanostructured materials.

The dimensions are: 1 100nm nanoparticles are condensed and buried into blocks, curved films, multilayer films and fibers, which are divided into three categories: crystalline, quasi-crystalline and amorphous.

Nanotechnology refers to a comprehensive technical system that prepares, researches and industrializes substances at the nanoscale, as well as cross-research and industrialization of nanoscale materials.

There are many applications of nanotechnology, such as construction, nano ceramics, nano home appliances, EPS, etc. 1. By mixing smart materials and nano titanium dioxide particles, the windows of buildings can be cleaned, which is both clean and environmentally friendly. These energy-efficient materials have been applied to 7,000 square meters of roads in Milan, reducing nitrogen dioxide levels by 60%.

2. Use nano ceramics in cement to increase strength, and add some nano materials to new building materials, so as to improve mechanical strength, durability and insulation, while reducing weight compared with traditional materials. 3. Nano home appliances. At present, the nano freezers sold on the market use nano-treated materials in parts that are easy for people to contact and bacteria to invade.

This material can effectively inhibit the growth of bacteria by bending the wheel, thereby improving the antimicrobial ability of the freezer. Nano washing machine, that is, the outer barrel of the washing machine is made of nano materials, so that the washing machine is not only resistant to high temperature and wear, but also has strong anti-scaling ability. 4、eps:

Nanotechnology is applied to divide gasoline molecules into nano-unit protons to ensure full combustion. The result of this application is that gas combustion fully contributes to power increase and energy savings.

Examples of nanomaterial applications can be cited to many. For example, chemical fiber clothes often produce annoying static electricity when worn on the body. A small inconspicuous electrostatic spark can cause ** and fire on some special occasions.

If a small amount of metal nanoparticles is added in the production of chemical fiber fabrics, then the chemical fiber fabrics made of pure vertical fabrics will no longer have the phenomenon of rubbing trouser finger rubbing. Another example is adding some nanoparticles to textiles such as socks, which can deodorize and sterilize. At present, nano washing machines, air conditioners and sterile tableware that can remove odors, antibacterial gauze, etc., have appeared on the market, and nanomaterials are used in these products.

Nowadays, scientific and technological progress is advancing with each passing day. Many people already have some understanding of high-tech such as "Internet" and "genes". In recent years, new terms such as "nano", "nanotechnology" and "nanomaterials" have become louder and louder.

For many teenagers, the term "nano" seems unfamiliar, and nanotechnology is even more magical and incomprehensible. In fact, nanotechnology has long been quietly integrated into our lives.

A nanometer is a unit of length, and one nanometer is equal to one billionth of a meter, which is really small. How small is it? To use an analogy:

Make a red plastic ball with a diameter of one nanometer (of course, invisible to the naked eye) and place it on a ping-pong ball as if you were putting a ping-pong ball on the earth. Electron microscopy is required to observe the shape and topography of nanomaterials.

The so-called "nanomaterials" and "nanotechnology", simply put, are some ordinary materials made into nano to hundreds of nanometers of particle materials, which are extremely small in size, but have a large surface area and special structure, which will produce a kind of magic and special properties, and apply them. Scientists have summarized the special properties of nanomaterials into four major effects: small size effect, surface effect, interface effect, and macroscopic quantum tunneling effect.

Examples of nanomaterial applications can be cited to many. For example, chemical fiber clothes often produce annoying static electricity when worn on the body. A small inconspicuous electrostatic spark can cause ** and fire on some special occasions.

If a small amount of metal nanoparticles is added to the chemical fiber cloth in the production of chemical fiber fabrics, then the frictional electricity generation phenomenon will no longer occur in the chemical fiber fabrics. Another example is adding some nanoparticles to textiles such as socks, which can deodorize and sterilize. At present, nano washing machines, air conditioners and sterile tableware that can remove odors, antibacterial gauze, etc., have appeared on the market, and nanomaterials are used in these products.

Scientists pointed out that nanotechnology is the common basis for the further development of information and life science technology, a key point in the future development of science and technology, a technological revolution, and will also give rise to another industrial revolution in the 21 st century, which will have a huge and far-reaching impact on human society.