What are the main physical properties of ultrafine gold powder? What is the difference between it and regular gold powder?

Ultra fine gold powder, as a high-purity and highly active metal material, has shown a wide range of application prospects in modern industry. Its unique physical properties not only make it stand out in many fields, but also demonstrate significant advantages compared to ordinary gold powder. Advanced Institute (Shenzhen) Technology Co., Ltd. willsuper-fine powdered goldStarting from the main physical characteristics of gold powder, we will delve into its differences from ordinary gold powder and pay special attention to its performanceGold conductor pasteApplication in conductive gold adhesive.

Main physical properties of ultrafine gold powder

1. Grain size and morphology

One of the notable features of ultrafine gold powder is its extremely small particle size. Usually, the particle size of ultrafine gold powder is in the micrometer or even nanometer range, with an average particle size as small as 0.1-0.5 μ m, and the morphology is mostly spherical or sheet-like. This small particle size makes ultrafine gold powder have a very large specific surface area, usually up to 0.48-0.63m ²/g, much higher than ordinary gold powder. The increase in specific surface area not only enhances the surface activity of gold powder, but also strengthens its efficiency in catalytic reactions.

2. Color and Gloss

The color of ultrafine gold powder gradually deepens as the particle size decreases, transitioning from golden yellow to reddish brown or even black. This color change is the result of the combined effect of light scattering and changes in the electronic structure of the particle surface. Despite the darkening of the color, the ultra-fine gold powder still maintains a good glossiness, giving it a unique visual effect in decorative and functional applications.

3. Conductivity and thermal conductivity

Ultra fine gold powder exhibits excellent conductivity and thermal conductivity due to its high purity and small particle size. In the fields of electronics and optoelectronics, this characteristic makes it a promising candidate for preparationHigh performance gold conductor pasteIdeal material for conductive gold glue. The gold conductor paste forms a conductor through screen printing and sintering, and its conductivity directly determines the performance and stability of electronic devices. And conductive gold glue utilizes the conductivity of ultrafine gold powder to achieve reliable connections between electronic components.

4. Catalytic activity

The high specific surface area and increased surface active sites of ultrafine gold powder enable it to exhibit higher catalytic activity in catalytic reactions. This catalytic activity is particularly important in the fields of environmental protection and energy, and can be used for wastewater treatment, exhaust gas purification, and improving energy conversion efficiency. By loading ultrafine gold powder onto porous carriers, catalysts with specific catalytic properties can be prepared to meet various industrial needs.

Difference from regular gold powder

1. Particle size and specific surface area

The particle size of ordinary gold powder is usually larger, and the specific surface area is relatively smaller. In contrast, ultrafine gold powder has achieved a significant reduction in particle size and a significant increase in specific surface area through advanced preparation processes. This change not only enhances the surface activity of gold powder, but also strengthens its application performance in various fields.

2. Catalytic activity and conductivity

Due to its small particle size and large specific surface area, ultrafine gold powder exhibits higher catalytic activity and selectivity in catalytic reactions. Meanwhile, its excellent conductivity also makes it have broader application prospects in the fields of electronics and optoelectronics. In contrast, ordinary gold powder has relatively weaker performance in these aspects.

3. Application Fields

The application fields of ultrafine gold powder are more extensive and in-depth. In the field of electronics, ultrafine gold powder is used to prepare high-performance gold conductor paste andConductive gold adhesiveKey materials; In the field of optoelectronics, it can be used to prepare high-efficiency solar cells and photocatalysts; In the field of catalysis, it can be used for environmental and energy projects such as wastewater treatment, exhaust gas purification, and energy conversion. However, ordinary gold powder is more commonly used in fields such as decoration and coatings, and its application range and performance are relatively limited.

conclusion

In summary, ultrafine gold powder occupies an important position in modern industry due to its unique physical properties and wide application prospects. Its small particle size, high specific surface area, excellent conductivity, and catalytic activity make it show great potential and value in the fields of gold conductor paste, conductive gold gel, environmental protection, and energy. With the continuous progress of science and technology and the expansion of application fields, the market prospects of ultrafine gold powder will be even broader.