Gold or silver particles with paramagnetism, and composition containing thereof
A paramagnetic, silver powder technology, used in the field of cosmetics, depilatory, or toothpaste compositions, can solve the problems of limited application fields, poor dispersibility of gold or silver powder, etc.
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
Method used
Image
Examples
preparation example 1
[0070] By using an inductively coupled plasma torch, a 13.56MHz 10kW class RF power amplifier (7kW or greater if a single type RF power amplifier; 5kW or greater per amplifier for a dual type), and a helical antenna RF power application components, in 10 -3 38000-45000K (T max =84000K) argon plasma. When the temperature exceeds 30000K (which is a suitable temperature for the actual reaction), and the argon plasma density exceeds 4×10 11 g / cm 3 , the vacuum should be adjusted to about 1 Torr by increasing the input of argon (99.999% pure, which is the reaction gas). The length of the reaction flame (in which the generated plasma is formed) is adjusted to 600-700 mm, and reacted with the silver raw material powder. After the raw material powder is completely changed into the atomic or metal plasma gaseous state, it is cooled by rapid heat exchange in 20-30°C water for 2-5 seconds under vacuum conditions, and a spherical paramagnetic Ag white form with a size of 1-40 μm is ob...
preparation example 2
[0072] The length of the reaction flame (in which the plasma is formed) is adjusted to 300-400 mm. After the metal plasma became gaseous, under the same preparation conditions as in Preparation Example 1, except that the cooling was carried out in liquid nitrogen at -50 to -100° C. for 0.5-1 seconds under vacuum conditions, a compound having a thickness of 50 nm- 3μm-sized spherical paramagnetic gray silver powder (Ag gray type). Such as Figure 5 As shown (which is a TEM photograph of the obtained gray silver powder), no oxide layer exists on the surface of the silver powder.
preparation example 3
[0074] The reaction flame length (in which the plasma is formed) was adjusted to 250-300 mm by manual RF application elements using two trapezoidal antennas in the reaction tube. After the raw material powder becomes metal plasma gaseous state, under the same preparation conditions as in Preparation Example 1, except that the cooling is carried out under vacuum conditions in liquid nitrogen lower than -100° C. for 0.1-0.3 seconds, a mixture with 1 - 50nm size spherical paramagnetic black silver powder (Ag black type). Such as Figure 6 As shown, which is a TEM photograph of the obtained black silver powder, no oxide layer exists on the surface of the silver powder. Also, the powder particles do not show cohesion, but can be well dispersed in distilled water, ethanol, methanol, etc.
PUM
| Property | Measurement | Unit |
|---|---|---|
| size | aaaaa | aaaaa |
| size | aaaaa | aaaaa |
| size | aaaaa | aaaaa |
Abstract
Description
Claims
Application Information
Login to View More