Transcript Nano - 2010SMTPSec3

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 (sizerelated/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/-2652goldnanoparticles-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?