The harm of graphene to human body, I believe everyone is familiar with graphene. This extracted chemical is widely used in our life. Take the battery of our mobile phone as an example, some of it is made of graphene. Since graphene is so widely used, some people think that graphene is harmful to human body. Let's have a look.
The harm of graphene to human body 1 What is graphene?
1, graphene, a two-dimensional crystal composed of carbon atoms stripped from graphite material, is the thinnest of known materials. In fact, graphene originally exists in nature, but the single-layer structure is difficult to peel off.
2. Graphene is stacked layer by layer to form graphite, and the graphite with the thickness of 1 mm contains about 3 million layers of graphene. Pencil gently across the paper, leaving traces may be several layers or even just a layer of graphene. Graphene is a nano-material, which is more stable and has a longer service life than previous carbon materials.
Graphene is potentially harmful to human body and environment.
Many people know that graphene seems to be the gospel that can create future miracles for the technology industry, but what you don't know is that this material may not be very good for the environment or even for our human body. When we talk about graphene, most people are quite excited. For example, only the thickness of atoms, this material is very light and strong, elastic and has good conductivity to heat and electricity. All these characteristics make it possible to set off a scientific and technological revolution, so many people call it a wonderful material.
In fact, however, it has been 10 years since graphene was first isolated in the laboratory. It seems that researchers and the whole industry have no intention of really taking it out of the laboratory for large-scale commercial use, and it is said that the cost of studying the potential negative effects of this material is not much.
Two recent studies do not seem to be good news for graphene. First, a team of biologists, engineers and materials scientists from Brown University tested the potential toxicity of this material to human cells. They found that the serrated edges of graphene nanoparticles are very sharp and strong, and can easily penetrate into the cell membranes of human skin and immune cells. As shown in the above figure, it can be seen that graphene does have potential serious harm to humans and other animals.
Robert Hurt, an engineering professor and one of the authors of this study, said: "These materials can be inadvertently inhaled, intentionally injected and implanted into the human body as part of new biomedical technologies, so we need to understand how they interact with cells in the body."
Another study was initiated by a research team at the University of California. Burns Institute of Engineering found that graphene oxide nanoparticles can have an impact on the environment if they find a way to enter the surface or groundwater resources. The team studied the groundwater resources containing almost no organic matter. The hardness of these waters is very high, and graphene oxide nanoparticles will become unstable and precipitate in such an environment.
In surface water such as lakes and rivers, the content of organic matter is relatively high, and the hardness of water is relatively low, so these particles are more stable, can drift farther, and can also flow underground. Therefore, the leakage of such nanoparticles may cause harm to organic matter, plants, fish, animals and humans. The affected area will spread quickly. Co-authors Jacob D and Lanphere, who published the paper, said: "Today's situation is similar to that of chemicals and drugs flooding around us 30 years ago. We don't know what will happen when these engineering nanomaterials enter the ground or water. Therefore, we need active research, and we need data to confirm whether this material can be applied in future technologies. "
At present, the industrial application of graphene in material safety data sheet is not complete. It is said that this substance is potentially harmful and irritating to skin and eyes, as well as breathing and intake. At present, there is no data to show whether such substances have carcinogenic risk or potential developmental toxicity.
The harm of graphene to human body 2 What does graphene floor heating look like?
Graphene floor heating is a kind of electric heating, and graphene is used for coating treatment. This kind of floor will not emit any radiation when working, so it will not cause any harm to human body.
Graphene floor heating itself is a kind of graphene film, a nano-material similar to a honeycomb. Although thin, it heats up quickly. The conversion rate of graphene floor heating is as high as 99%, and the room temperature can rise rapidly. However, graphene material has not been industrialized, its performance is extremely unstable and its cost is high.
How much is graphene floor heating per square meter?
The price of graphene floor heating is almost between 200-400 yuan /m2, because the economic conditions and labor costs in different regions are different, and the price will be different. This price is not the price of materials, including the installation of various auxiliary materials, such as PE film, extruded board, T-cable and so on.
I suggest you find a professional installation company. However, this price is not cheap. If the budget is not enough, it is still a bit extravagant to choose graphene floor heating, but this material has better floor heating and heat dissipation effect and longer service life, depending on personal circumstances.
What is the principle of graphene floor heating?
Graphene, graphite and diamond are all carbon atoms and allotropes. Graphene is a material composed of a single carbon atom, while graphite and diamond are formed by combining carbon atoms according to certain rules. In industrial applications, we call the carbon atoms in these ten layers graphene. Single layer is very expensive, mainly used in aerospace and military fields. Only 2-4 layers of graphene will be used in the civil field, and the price is tens of yuan/gram.
Under the action of current, the carbon atoms in graphene will form irregular Brownian motion, which will generate heat by collision and friction, and then radiate to the surrounding area in the form of far infrared rays. This principle is the same as the principle that people feel warm in the sun.