Therefore, in terms of "silver ion", it is characterized by:

Silver ions are positively charged "cations" formed by electron transfer by chemical reactions;

The application of silver ions depends on the properties of the ions themselves and the charge price, regardless of the ion size, and there is no nano effect;

Silver ions are present in the form of an aqueous solution. Colorless and transparent, without any solid particles;

Silver ion medical products have been included in the National Pharmacopoeia as early as the last century, such as: silver nitrate solution.

In summary, nano silver and silver ions are essentially different in terms of their characteristics and formation, and their application properties.

※ Nano silver:

"Nano" is the translated name of the English namometer, which is a unit of measurement, 1 nanometer is a millionth of a millimeter, which is a billionth of a meter. Usually less than 100 nanometers of material is called nanomaterial or nanoscale material, but strict In other words, only materials with nano-effects can be called nanomaterials.

Due to the small particle size, large specific surface area, high surface energy and large proportion of surface atoms, nanomaterials exhibit three unique effects: surface effect, small size effect and macroscopic quantum tunneling effect. After the invention of the scanning tunneling microscope in 1981, a molecular world study with a length of 0.1 to 100 nanometers was born. Its ultimate goal is to construct products with specific functions directly by atoms or molecules. Nanotechnology is a new technology developed in recent years. The United States, Britain, France and other countries have only included nano research in the national key development areas around 2000.

Nanosilver is a metallic silver element with a diameter of less than 100 nanometers, generally 20 to 50 nanometers. Nanosilver is a silver particle composed of an atomic structure, not a silver ion. Nanosilver is uncharged and is a solid powder. The metal silver element is processed into a metallic silver element having a particle diameter of less than 100 nm by physicochemical methods.

Nanosilver is a black powder whose preparation is to incorporate nanosilver into the medium or matrix in different ways. The nano-silver solution is a suspension of nano-silver, and the color changes with the concentration. As the concentration increases, the color gradually deepens from yellow to deep red. There are particles in the liquid, the texture is rough, not delicate.

Therefore, as far as "nano silver" is concerned, its characteristics are:

, nano silver is a "silver particle" composed of atomic structure, without charge, is a solid powder;

, nano silver is less than 100 nanometers of metallic silver;

The application of nanosilver is closely related to its true particle size and whether it has nano-effects;

Nanomaterials are a new technology that emerged around 2000 and are not fully mature.

※ Silver ion

Ions are charged atoms (or groups of atoms), positively charged ions are called cations, and negatively charged ions are called anions. Generally, the ion size is not considered, and it is only considered when it is coordinated; the unit of measurement is angstrom, which is a smaller unit of atomic structure than nanometer.

Ions are formed by electron transfer through chemical reactions. Their properties depend on what ions and the charge price are charged. They have little to do with the size of ions and have no nano-effect. It is usually present in the form of an aqueous solution. Colorless and transparent, without any solid particles, stable in state.

Silver ions are silver in which silver atoms lose more than one electron. It means that silver exists in an ionic state, usually positively charged. Such as Ag+1, Ag2+, Ag3+, and the like. Silver ion pharmaceutical products have been included in the Chinese Pharmacopoeia in the past century, such as silver nitrate solution.

Silver ions have different oxidation activities with different valence positions. The +2, +3 silver ions have high oxidizability. The oxidation-reduction potential of Ag+ is determined by voltammetry (±0.798 ev, 25 °C), while Ag2+ has higher oxidation. Reduction potential (± 0.102 ev, 25 ° C). The effectiveness of high-priced silver ions is 300 to 17,000 times that of metallic silver or silver salts. Since the high-valent silver ion has a very high reduction potential, it is also called active silver ion.

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