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Welcome to the nanotechnology portal
Nanotechnology is the study of manipulating matter on an atomic and molecular scale. Generally, nanotechnology deals with developing materials, devices, or other structures possessing at least one dimension sized from 1 to 100 nanometers.
Nanotechnology is very diverse, including extensions of conventional device physics, new approaches based on molecular self-assembly, developing new materials with nanoscale dimensions, and investigating whether we can directly control matter on the atomic scale. Nanotechnology entails the application of fields as diverse as surface science, organic chemistry, molecular biology, semiconductor physics, microfabrication, etc.
There is much debate on the future implications of nanotechnology. Nanotechnology may be able to create many new materials and devices with a vast range of applications, such as in medicine, electronics, biomaterials and energy production. On the other hand, nanotechnology raises many of the same issues as any new technology, including concerns about the toxicity and environmental impact of nanomaterials, and their potential effects on global economics, as well as speculation about various doomsday scenarios.Template:/box-footer
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Colloidal gold
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Colloidal gold is a colloid (a suspension in a fluid) of sub-micrometer-sized particles of gold. Due to the unique optical, electronic, and molecular-recognition properties of gold nanoparticles, they are the subject of substantial research, with applications in a wide variety of areas, including electron microscopy, electronics, nanotechnology, and materials science.
Known since ancient times, the synthesis of colloidal gold was originally used as a method of staining glass. Modern scientific evaluation of colloidal gold did not begin until Michael Faraday's work of the 1850s, who was the first to recognize that the color was due to the minute size of the gold particles. In 1898 Richard Adolf Zsigmondy prepared the first colloidal gold in diluted solution. Gold nanoparticles are currently being investigated for modern applications. Colloidal gold and various derivatives have long been among the most widely-used contrast agents for biological electron microscopy. Gold nanoparticles are being investigated as carriers for hydrophobic drugs, which require molecular encapsulation. In cancer research, colloidal gold can be used to target tumors and provide detection using SERS in vivo. Small diameter gold nanorods are being used as photothermal converters of near infrared light, which transmits readily through human skin and tissue.
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