What is Colloidal Gold?

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What is Colloidal Gold?
Colloidal gold is a sol or colloidal suspension of gold nanoparticles in a fluid (usually water). Colloids are usually wine red (for spherical particles smaller than 100nm) or blue/purple (for larger spherical particles or nanorods). Due to their optical, electronic, and molecular recognition properties, gold nanoparticles are the subject of a great deal of research in fields including electron microscopy, electronics, nanotechnology, materials science, and biomedicine. 
The properties of colloidal gold nanoparticles and their potential applications depend largely on their size and shape. For example, rod-like particles have transverse and longitudinal absorption peaks, and anisotropy of shape affects their self-assembly. 
 
Colloidal gold has been used by artists for centuries because of the interaction of nanoparticles with visible light. Depending on particle size, shape, local refractive index, and state of aggregation, gold nanoparticles absorb and scatter light to produce colors that range from bright red (smaller particles) to blue to black, and finally transparent and colorless (larger particles). The colors appear due to a phenomenon called local surface plasmon resonance (LSPR), in which conducting electrons on the surface of the nanoparticles resonate with incident light. 
As a general rule, the wavelength of the absorbed light increases with the size of the nanoparticles. For example, pseudo-spherical gold nanoparticles with a diameter of about 30 nm have peak LSPR absorption at about 530 nm. 
Apparent change color of the gold nanoparticles solution can also be caused by the environment of colloidal gold suspension of optical properties of gold nanoparticles depend on the refractive index near the surface of the nanoparticles, thus two molecules connected directly to the surface of nanoparticles (i.e., nanoparticles ligand) and/or nanoparticles of solvent may affect the observed optical characteristics. As the refractive index near the gold surface increases, NP LSPR will shift to longer wavelengths except in solvent environments, where the extinction peak can be adjusted by coating nanoparticles with non-conductive shells such as silica, biomolecules, or alumina. 
When gold nanoparticles aggregate, the optical properties of the particles change because the effective particle size, shape, and dielectric environment all change.
 
What is Colloidal Gold Used For?
Drug delivery system 
Gold nanoparticles can be used to optimize the biological distribution of drugs in diseased organs, tissues, or cells to improve and target drug delivery. Nanoparticle mediated drug delivery is feasible only if drug distribution is inadequate. Examples include drug targeting against instability (proteins, siRNA, DNA). Delivery to difficult sites (brain, retina, tumor, intracellular organelles) and drugs with serious side effects (e.g., anticancer agents). The performance of nanoparticles depends on particle size and surface function. In addition, drug release and particle decomposition may vary from system to system (e.g. ph-sensitive biodegradable polymers).
 
Radiotherapy dose enhancer 
There has been considerable interest in using gold and other nanoparticles containing heavy atoms to enhance the dose delivered to tumors. Because the gold nanoparticles are absorbed more by the tumor than nearby healthy tissue, the dose is selectively increased.  The biological effectiveness of the treatment appears to be due to the local deposition of radiation dose near the nanoparticles. This mechanism is the same as in heavy ion therapy. 
 
Toxic gas detection 
A simple and inexpensive method for in-situ detection of H2S in the air has been developed based on the AuNPs properties of gold nanoparticles. When H2S is dissolved into weakly alkaline buffer solution, HS- is formed, which can stabilize AuNPs and ensure that AuNPs remain red, facilitating naked detection of H2S toxicity level.
 
What is the Difference between Colloidal Silver and Colloidal Gold? 
Colloidal silver is widely used to treat a variety of conditions, including viral and bacterial infections, allergies, burns, skin conditions, and even cancer and HIV. 
Colloidal gold is thought to improve memory and cognitive function, reduce stress, reduce headaches and improve overall health. 
 
Is Colloidal Gold Natural? 
Gold nanoparticles are a natural substance without any chemical additives.
 
Colloidal Gold Price
The price is influenced by many factors including the supply and demand in the market, industry trends, economic activity, market sentiment, and unexpected events.
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Colloidal Gold Supplier
Luoyang Tongrun Nano Technology Co. Ltd. (TRUNNANO) is a trusted global chemical material supplier & manufacturer with over 12-year-experience in providing super high-quality chemicals and nanomaterials including silicon powder, nitride powder, graphite powder, zinc sulfide, calcium nitride, 3D printing powder, etc.
If you are looking for high-quality colloidal gold, please feel free to contact us and send an inquiry. ([email protected])
 

The secretary of Ukraine's National Security and Defense Council said the US arms lease bill to Ukraine has not yet been implemented. This is still in the process and could start from July to September 2022, he said. The approval of this bill is a very positive decision for Ukraine. Aid to Ukraine through lend-lease will eventually come, the question is when.  

In an effort to speed up the supply of weapons to Ukraine, President Joe Biden signed a defense lend-lease bill for Ukraine at the White House on May 9.

Nippon Steel, JFE Steel, and Kobe Steel will work together to develop a steel-making process that uses hydrogen to reduce carbon dioxide emissions without using blast furnaces. Small test furnaces will be built at Nippon Steel's Hwazaki Research and Development Center (Kamiki city, Ibaraki Prefecture) and JFE's East Japan Steel In Chiba (Chiba City). The two test furnaces, which will be operational by 2024-25, will confirm whether ore with high levels of impurities can also operate smoothly.

Luoyang Tongrun Nano Technology is a trusted chemical supplier and manufacturer providing high-quality chemicals and Nanomaterials. If you are looking for the colloidal gold, please feel free to contact us and send an inquiry.

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