SHE 2 Flashcards
what is nanotechnology
nanotechnology is the science, engineering and technology conducted at the nanoscale, which is about 1 to 100 nanometres.
how did romans use nanotech
the Romans created the Lycurgus Cup which had silver and gold nanoparticles embedded into it which mad it shine red/purple when light shone through it but green when there was no direct light.
what is colloidal gold
colloidal gold is a suspension of gold nano particles in a solvent which is often water which leads them to have different optical, electronic and thermal properties.
what colour is colloidal gold
the solution was red not gold due to the nanoparticle
what are uses of colloidal gold
colloidal gold was used in medieval times as stained glass
it can be used as an anti inflammatory similar to colloidal silver
electron microscopy
what did John Bardeen, William Shockley, and Walter Brattain discover, in 1947
they invented the transistor which is a small semiconductor that used germanium.
it was able to turn off and on billions of times a second while requiring low energy.
they amplify weak electrical impulses
why was the transistor important
it allowed for smaller more reliable computers
why are transistors important to the information age
they are used in almost every modern technology such as smart phones and PCs therefore without them it would be impossible
what are nanotubes and why are they important
carbon nanotubes are fullerenes of carbon 1 atom thick rolled into a tube shape that is harder than diamond but also more flexible than rubber
they could be used on satellites to make them very dark so that there is even less light pollution
how is nanotechnology used is medicine
due to different types of cells having different properties nanotechnology can be used to recognise certain cells and target them while avoiding others entirely
gold nanoparticles can target Tumour Necrosis Agent which binds to it and hides it from the immune system which allows them to accumulate in the tumour and kill it
silver nanoparticles are used on wound dressings as an antibacterial as they rapidly penetrate the bacterial membrane and destroy the cellular structure
why might nanoparticles be dangerous
they may damage the lungs as the nanoparticles can get really deep in the lungs
they may also create more free radicals that damage DNA
they may be able penetrate the blood brain barrier
