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What is Colloidal Gold?

wallpapers News 2021-12-29
Colloidal gold is gold nanoparticles in the sol or gel fluid (usual water) suspension colloid color is usually a strong red spherical particle (less than 100 nanometers) or blue/purple (the larger spherical particle or nanorods) due to its optical, electronic, and molecular recognition characteristics, gold nanoparticles is a great deal of research object, It has many potential and promising applications in electron microscopy, electronics, nanotechnology, materials science, biomedicine, and other fields
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 shape anisotropy affects their self-assembly
Colloidal gold history
The 4th century Lycurgus cup used this method of staining glass colloidal gold, which changed color according to the position of the light source
In the Middle Ages, soluble gold, a solution containing gold salts, was known for its ability to cure a variety of ailments. In 1618, the philosopher Francis Anthony published a book called Panacea Aurea (Latin for gold potion, or two cures for drinking gold). This book provides information on the formation of colloidal gold and its medical uses. About half a century later, The British botanist Nicholas Culpepper published his Treatise of Aurum Potable in 1656, which was devoted to colloidal gold's medical uses.
In 1676, The German chemist Johann Kunckel published a book on the manufacture of stained glass. In his book valuable Observations and Reviews on Fixed and Volatile Salts, he postulated that the pink color of drinkable gold comes from particles of metallic gold that are invisible to the naked eye. In 1842, John Herschel developed a photographic method called chrysotype(from the Greek χρῡσ ς means "gold") that used colloidal gold to record images on paper.
It was not until the work of Michael Faraday in the 1850s that modern science began to evaluate colloidal gold. In 1856, in a basement laboratory at the Royal Institution, Faraday accidentally produced a ruby red solution while loading gold foil onto a slide. Since Faraday was already interested in the properties of light and matter, he further investigated the optical properties of colloidal gold. In 1857 he prepared the first sample of pure colloidal gold, which he called "activated gold".He used phosphorus to reduce a solution of gold chloride. The colloidal gold Faraday made 150 years ago still rotates light. For a long time, the composition of "ruby" gold was not clear. Several chemists suspected it was a gold-tin compound because of the way it was prepared. Faraday realized that the color was actually due to the tiny size of the gold particles. He noticed the light-scattering properties of suspended gold particles, now known as the Farhadi-Tyndall effect
In 1898, Richard Adolf Zsigmondy prepared the first colloidal gold in a dilute solution. Gustav Mie, who theorized the scattering and absorption of spherical particles, were also interested in the synthesis and properties of colloidal gold
With the advancement of various analytical techniques in the 20th century, the study of gold nanoparticles has accelerated. Advanced microscopy techniques such as atomic force microscopy and electron microscopy have contributed most to the study of nanoparticles. Due to its relatively easy synthesis and high stability, various gold particles have been studied. Different types of gold nanoparticles are already being used in many industries, such as electronics.
Colloidal gold supplier
TRUNNANO (aka. Luoyang Tongrun Nano Technology Co. Ltd.) is a trusted global chemical material supplier & manufacturer with over 12 years of experience in providing super high-quality chemicals and Nanomaterials. Currently, our company has successfully developed a series of materials. The Colloidal gold produced by our company has high purity, fine particle size, and impurity content. Send us an email or click on the needed products to send an inquiry.