Many people do not realize that there are many different types of gold. For example, colloidal cold is a suspension or colloid, hence the name, of sub-micrometer-sized particles of the amount of gold in water or another fluid. This type of gold is commonly referred to as nanogold and is found in a liquid that is usually an intense red color or a dirty yellowish color. The color largely depends on the size of the particles. For examples, larger particles will usually have the yellowish dirty color and the red color is usually common for particles that are less than 100 nm. When it comes to the nano particles themselves, there is not always the same shape as they commonly appear in many different shapes including spheres, cubes, rods, and caps. However it’s important to note that these are not the only shapes, these are just the ones that are commonly observed and found.
The process of colloidal gold is something that has been around for a long time and was actually utilized in ancient times as a method of staining glass. However it wasn’t until the 1850Õs that Michael Faraday put colloidal gold under modern scientific evaluation in his work. There are a wide variety of scientific studies that are related to the study of nanoparticles and nano technology that are directly related to the study of colloidal particles and colloidal gold. The reason that so many different scientific researchers are interested in colloidal gold is because of the fact that the gold has unique electronic, optical and molecular recognition properties. If you are interested in learning more about colloidal gold and nano particles, there are many resources online that will allow you to easily do so.