The gold we usually see is golden yellow, but the nano gold powder is pink; the iron can not be ignited at normal temperature, but the nano iron powder can ignite.

Why did these metals become tiny nanoparticles and the properties changed completely? Now let's take a closer look at the skills of nano gold particles and see how they have wonderful functions.

1.Smart microcircuit

Behind the LCD screen is a transparent, conductive film that acts as an electrode. When a weak current flows through the electrodes, the color of the liquid crystal changes to show text or pictures. This is why the LCD does not require a bulky picture tube.
Conventionally, such a film is required to sputter transparent conductive indium tin oxide onto a liquid crystal panel in a high vacuum environment. This process is complicated and expensive. Recently, scientists in Singapore have found a better way to replace expensive indium tin oxide with gold and reduce the process requirements.
If you have had coffee, you will notice a phenomenon: When coffee is accidentally splashed on the table, after drying, it will leave a round yellow spot. These yellow spots are not uniform in color, the edges are deeper and the middle is lighter, which means that the coffee powder is mostly concentrated on the edges.

Such a common phenomenon has inspired material scientists. They experimented with a suspension of nano-gold particles instead of coffee. These gold particles are about 20 nanometers in size, while the gold atoms are 0.2 nanometers in size, so that one nano gold particle contains almost one million gold atoms. They poured the suspension onto a glass plate and allowed it to evaporate. This glass plate is also uncommon, and the surface is coated with a layer of latex. The latex microspheres having a size of about 50 to 100 microns (1 micrometer = 1000 nm) are compactly and evenly arranged on the glass plate. To control the rate of evaporation and convection, the researchers gradually reduced the temperature to 4 degrees Celsius. During the slow evaporation process, these nano-gold particles gradually move to the bottom of the latex microspheres as the coffee powder evaporates, and precipitate there to form a loop-connected honeycomb grid.
Wait until the water in the suspension evaporates and then heat the glass plate, so that the layer of latex coated on the surface is also evaporated, so a very thin, transparent microcircuit made of gold nanoparticles is made. If such a microcircuit can be fabricated on a liquid crystal panel by this method, relatively inexpensive gold can replace the currently widely used indium tin oxide material.

2.Medical application

In the past few years, there has been another major breakthrough in molecular biology. Biologists have discovered that some short RNA molecules can interfere with gene expression in cells. For example, some flowers, although they have the gene for safflower, should be safflower under normal circumstances, but if a short RNA is injected into their cells, normal gene expression will be disturbed, and the red one will no longer be red. spent. This discovery won the 2006 Nobel Prize.
Many diseases, including the horrifying AIDS, are caused by the expression of some of our foreign genes (such as genes embedded in viruses) that are treated as our own genes. Since short RNA can interfere with the expression of certain genes, why not use these short RNAs to treat diseases? Indeed, this idea has long been thought of, they are developing RNA drugs. However, the drug is currently experiencing obstacles, and these short RNAs are broken down after they have entered the cell and have not yet had time to function.
Recently, scientists have found that if nano gold particles are used as carriers for short RNA, their survival rate can be greatly improved.
In the experiment, scientists first bundled short RNAs on individual gold nanoparticles. These particles are about 13 nanometers in diameter, and 30 short RNAs are bundled on each particle, and then placed in the cell culture medium. It was found that in less than 6 hours, 99% of the short RNA together with the gold nanoparticles were absorbed into the body by the cells.
In the past, short RNAs broke down in less than a few minutes after they entered the cell. Now these short RNAs bound to nanogold particles can survive for hours or even days. This gives them enough time to play the role of the drug.
Scientists speculate that this may be the bundle of dozens of short RNAs in the same place, which will help them create a favorable environment for survival. This is like being annihilated by a single army, but the group can fight to win.
The case of gold nanoparticles tells us that when we think about certain substances, their "physical shape" changes, and our performance will surprise us.

SAT nano technology Material Co., Ltd can supply gold nanopowder 20nm, 40nm, 100nm, please feel free to ask us a quote.

Best Regards

Gary