17 Nano….. Molecule of protein GCSE Science Chapter 6 Electron microscope nanometre40GCSE ScienceChapter 6Molecule of protein
18 Nano….. Molecule of Carbon 60 GCSE Science Chapter 6 Electron microscopeNano…..nanometre1GCSE ScienceChapter 6Molecule of Carbon 60
19 Properties of Nanoparticles The properties of substanceschange entirely when in nano-sizedform.Silver (macro)Silver is a ductile and malleable metal (slightly harder than gold). It’s white with a metallic sheen capable of high shine. It has the highest electrical conductivity of any metal, even copper, and so is used to coat high quality electrodes/ electronic connections.Pure silver also has the highest heat conductivity of all metals (diamond is the only non-metal that’s higher).Because it reflects well, it’s used as a background for mirrors. Silver salts react to light, and silver nitrate is used in photographic film.silvere.g.GCSE ScienceChapter 6
20 Properties of Nanoparticles The properties of substanceschange entirely when in nano-sizedform.Silver (nano)Silver in this form shows different properties:It’s antibacterialIt’s antiviralIt’s antifungalIn each of the above examples, the silver nanoparticles prevent the organism’s respiratory enzymes from working, and so kills them in minutes.Special socks are now available that include silver nanoparticles in order to heal conditions such as athlete’s foot. Research has shown that silver can also be used to treat many diseases, from flu to HIV.GCSE ScienceChapter 6
21 Using Silver Nanoparticles The silver nanoparticles in this sock kills odour causing bacteria and keep the socks fresh!Coating the inside of the fridge with silver nanoparticles ensures that any microbe is killed and keeps the fridge clean hygienic and safe.GCSE ScienceChapter 6Nanoparticles in the washing machine ensure that the clothes are cleaned and disinfected.
22 Advantages and disadvantages of using nanoparticles Could penetrate skinand cause undesiredside-effectsSome haveantibacterial,antiviraland antifungal propertiesEasily releasedinto theenvironmentPreparation ofcertain catalystsNanoparticlesUnusual properties,leading to new usesThere is a lot that wedon’t know aboutnanoparticles at themoment. Much moreresearch is neededbefore their use becomeswidespreadGCSE ScienceChapter 6