The size and shape of colloidal silver nanoparticles are crucial to their properties and potential uses. The rod-like particles are characterized by transverse and longitudinal absorption peak structures, while anisotropy in shape can affect their self-assembly.
Because of the interaction between nanoparticles of visible light and colloidal gold, artists have been using it for centuries. Depending upon the particle size, shape, local index and state of aggregate, gold nanoparticles absorb light and produce colors that vary from bright red (smaller particles), blue (larger particles), and finally transparent (colorless) (larger particles). These colors are due to a phenomenon known as local surface plasmon reflection (LSPR), where conducting electrons on the nanoparticles resonates with incident light.
In general, the wavelength of absorbed light increases as the size of nanoparticles. For example, pseudospherical gold nanoparticles have a diameter of around 30 nm and peak LSPR absorbtion at approximately 530 nm.
A colloidal gold suspension may also cause apparent changes in color of gold nanoparticles solution. The optical properties and optical properties for gold nanoparticles depends on the refractive indice near their surface. This means that two molecules (i.e., nanoparticles-ligand and/or nanoparticles with solvent) can affect observed optical characteristics. NP LSPR shifts to longer wavelengths when the refractive Index near the surface of gold increases. However, this is not possible in solvent environments. Nanoparticles can be coated non-conductive shells (biomolecules or alumina) to adjust the extinction peak.
Gold nanoparticles are able to change their optical properties when they aggregate. This happens because of changes in the effective particle size, shape, dielectric environment, and other factors.
What does Colloidal Gold do?
Drug delivery system
Nanoparticles of gold can be used for optimizing the biological distribution drugs in diseased tissues, organs, and cells. This will allow for better drug delivery. Only if drug distribution is insufficient, nanoparticle mediated drug Delivery is possible. Examples of this include drug targeting against stability (proteins, siRNA and DNA). Delivery to hard sites (brains, retinas, tumors, intracellular organismelles) and drugs with severe side effects (e.g., antibiotics for cancer) are examples. Nanoparticle performance is affected by the particle size and their surface function. Additionally, drug release and particle degradation can differ from one system or another (e.g. ph sensitive biodegradable materials
Radiotherapy dose increaser
To increase tumor-specific doses, there has been much interest in gold and other particles containing heavy elements. The dose is selectively increased as the gold nanoparticles absorb more from the tumor than surrounding healthy tissue. The local deposition near the nanoparticles is what appears to make the treatment more biologically effective. This process is similar to heavy ion treatment.
Toxic gas detection
Based on the AuNPs characteristics of gold nanoparticles, a simple and affordable method has been developed to detect H2S in the atmosphere. The formation of HS- occurs when H2S is dissolved in weakly acid buffer solution. This can stabilize AuNPs, and allow for naked detection of H2S toxic level.
What is the Difference Between Colloidal Silver And Colloidal Gold
The widespread use of colloidal silver for treatment of a wide range conditions includes viral and bacterial infection, allergies, burns, skin conditions and even cancer.
Colloidal gold has been shown to improve memory and cognitive function as well as reduce stress and headaches.
Is Colloidal Gold Natural?
The gold nanoparticles are an all-natural substance, without any chemical additives.
Colloidal Silver Price
Price is affected by many factors, including supply and demand, industry trends and economic activity.
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Colloidal Gold supplier
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