The size and shape of colloidal silver nanoparticles are critical 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), to blue (larger ones), and finally transparent and uncolored (larger ones). These colors are due to a phenomenon known as local surface plasmon reflection (LSPR). Conducting electrons on the nanoparticles vibrate with incident light.
In general, the wavelength of absorbed light increases as the nanoparticles get larger. 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 visible color shifts in gold nanoparticles solutions. The optical properties and optical properties for gold nanoparticles depends on the refractive indice near their surface. Thus, 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 aggregate and change their optical properties as 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 organs, tissues or 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. Nanoparticles’ performance is affected by their surface function and particle size. 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. Because the dose is selectively raised because the gold nanoparticles absorb more from the tumor than the 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, Colloidal Gold and Colloidal Silver?
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 in a market, industry trends and economic activity.
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Colloidal Gold supplier
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