Takashima Kenji3O3(25)

Nanoparticles

ContentsDefinition of NanoparticleSilver NanoparticlesUses of Silver Nanoparticles

MedicinalHousehold/Industry

Nano GoldUses of Nano Gold

Medicine and HealthConclusionWeb/Journal reference

Definition of NanoparticleNano: 10-9

Definition: An ultrafine object between 1 and 100 nanometers, that may vary in properties (size-related/chemical related) as their bulk component (E.g. nanoparticle of gold may differ from particle of bulk gold)

Uses: Medicine, industry, maunufacturing, experiments

Characteristic: High surface area to volume ratio

Silver NanoparticlesSize: 10nm-100nmChemical formula: AgDetails: Silver nanoparticles are ultra fine

particles of silver. They are ten to a hundred nanometers large, and differ from the bul silver as they have different colours such as yellow, as opposed to the silver. This is due to plasmon absorbance:Incident light rays create oscillation in free

electrons on the surface of nanoparticles, causing them to absorb electromagnetic radiation, creating different colours reflected.

Uses of Silver NanoparticlesMedicine and Health

Silver has anti-bacterial propertiesCan bind to bacteria moleculeChemically change bacteria structure and rupture it,

eventually killing the cellPotential cure for HIV

Ability to bind to spikes of HIV virus and prevent it from latching on to cell. This ensures that the HIV virus does not bind to host cells and infection can be suppressed

Sugical insturments/masksWound healing(Antibacterial properties)

Uses of Silver NanoparticlesHousehold/Industry

Silver NanoSamsung Produced SilverNano, a patented product

that claims to have silver nanoparticles on surfaces of household particles for anti-bacterial properties.

Air purifiersSilver nano particles produced by air purifiers bind

to a binding agent in paint known as alkyd resin, which produces toxic free radicals, which get transformed by silver nano-particles to non-toxic metal nanoparticles.

Gold NanoparticlesSize: 100nm+Chemical formula: AuDetails: Gold nanoparticles, known as nano

gold or colloid gold, is a suspension of sub-micrometre-sized particles (10nm or more) in a fluiod, usually water. If the particle is less than 100nm, a intense red colour is usually observed, but if larger, a dirty yellowish colour is observed in the supension.This may be due to plasmon absorbance

It is also a semi conductor, in which it has an electrical conductivity of that between a conductor and an insulator

Uses of Nano GoldMedicine and Health

Arthiritis in rats and dogsImplantation of nano gold in knee of rat and dog acts as

painkillerDrug Delivery

Gold can be used as outer covering of drugs, which metl to release drug payloads when exposed to infrared light. Timing of drug release and uptake can thus be better controlled

Alzheimer’s DiseaseResearch done that combination of colloisdal gold can

microwave radiation can distroy plaque and fibrils that build up to cause Alzheimer’s disease.

Uses of Nano GoldMedicine and Health

CancerNano gold reflects light very well. Many cancers have

receptors on their outer layers, in which gold nanoparticles can be bound to antibodies which attach to the cancer cell receptors, and can be viewed under siple white light microscope to detect cancer cells by seeing the reflection of light.

Also, ability for gold nano rods to be inserted into cancer cell to weaken the cancer and eventually kill it poses potential to be cancer cure.

Toxin detectionNanoparticles can be coated with sugars to detect

certain toxins, in which as the nanoparticle binds to the toxin the whole solution changes colour to indicate the presence of the toxin. The device can be sued for portable toxin detection

Uses of Nano GoldHome/Industry

Stain GlassWater purificationUsed in electronics

Has material compatibilityDurableReliable materialUsed for touch sensitive screens and also potential

data storage device useMaking semiconductor chip work fater with less

energy by using like and shine of nano gold to engineer better semiconductor chips

ConclusionWith regard to gold and silver

nanoparticles:Extremely smallHave medical properties, and can be

beneficial to mankindHas physical and chemical changes form the

bulk molecule when shrunk to a small sizeAbility of portable usage since the particles

are very small

ReferencesScientific Journalhttp://pstca.com/silversol/zimag/theory/p322.pdfWeb Referencehttp://en.wikipedia.org/wiki/Silver_nanoparticleshttp://www.physorg.com/news124376552.htmlhttp://www.topnews.in/healthcare/content/-2652

gold-nanoparticles-may-carry-multiple-drugs-treat-cancer

http://news.bbc.co.uk/2/hi/technology/4872188.stm

http://www.mi2g.com/cgi/mi2g/frameset.php?pageid=http://www.mi2g.com/cgi/mi2g/press/110210.php

Video Referencehttp://www.youtube.com/watch?v=uyhxRIvw_cY

Any Questions?

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