Nanoparticles
Takashima Kenji
3O3(25)
Contents
Definition of Nanoparticle
Silver Nanoparticles
Uses of Silver Nanoparticles
Medicinal
Household/Industry
Nano Gold
Uses of Nano Gold
Medicine and Health
Conclusion
Web/Journal reference
Definition of Nanoparticle
Nano: 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 Nanoparticles
Size: 10nm-100nm
Chemical formula: Ag
Details: 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 Nanoparticles
Medicine and Health
Silver has anti-bacterial properties
Can bind to bacteria molecule
Chemically change bacteria structure and rupture it, eventually killing the
cell
Potential 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/masks
Wound healing(Antibacterial properties)
Uses of Silver Nanoparticles
Household/Industry
Silver Nano
Samsung Produced SilverNano, a patented product that claims to have
silver nanoparticles on surfaces of household particles for anti-bacterial
properties.
Air purifiers
Silver 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 Nanoparticles
Size: 100nm+
Chemical formula: Au
Details: 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 Gold
Medicine and Health
Arthiritis in rats and dogs
Implantation of nano gold in knee of rat and dog acts as painkiller
Drug 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 Disease
Research 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 Gold
Medicine and Health
Cancer
Nano 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 detection
Nanoparticles 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 Gold
Home/Industry
Stain Glass
Water purification
Used in electronics
Has material compatibility
Durable
Reliable material
Used for touch sensitive screens and also potential data storage device use
Making semiconductor chip work fater with less energy by using like and
shine of nano gold to engineer better semiconductor chips
Conclusion
With regard to gold and silver nanoparticles:
Extremely small
Have medical properties, and can be beneficial to mankind
Has physical and chemical changes form the bulk molecule
when shrunk to a small size
Ability of portable usage since the particles are very small
References
Scientific Journal
http://pstca.com/silversol/zimag/theory/p322.pdf
Web Reference
http://en.wikipedia.org/wiki/Silver_nanoparticles
http://www.physorg.com/news124376552.html
http://www.topnews.in/healthcare/content/-2652gold-
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 Reference
http://www.youtube.com/watch?v=uyhxRIvw_cY
Thank you!
Any Questions?