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UNIT-4 APPLICATIONS OF NANOMATERIALS II, WhatsApp Image 2022-11-13 at 8…
UNIT-4
APPLICATIONS OF NANOMATERIALS II
ENERGY APPLICATIONS
APPLICATION IN ENERGY STORAGE DEVICES
Laptops and smartphones are rapid, faster and heavy memory capacities.
"Millipede" uses an array of micro cantilevers to create a pattern in a polymer medium.
Samsung announced S12 mb mobile chips which is faster than NOR chip with help of lithography.
APPLICATION IN SOLAR CELLS
Nanomaterial based solar panels have increased performance and technology.
They are developing are developing cheap and easy to apply solar cells compared to nanorods dispersed in polymer.
These nanorods absorbs a particular energy wavelength to generate electrons.
APPLICATION IN FUEL CELLS
Low cost technologies of obtaining hydrogen from water with help of nanocrystals and catalysts.
It has also resulted in in performance of Li ion batteries.
The batteries loss 1% charging efficiently after 1000 cycles of utility.
BIOMEDICAL APPLICATIONS
1) Used in diagnosis, therapy, prevention.
2)It also enabled the production
of 'laboratories on a chip'
performs multiple tests.
3)these particles may absorb
infrared radiation which is
converted to heat to ablate
the target tissue.
4)Assembly of current molecular
entities and advanced molecular
compound delivery systems.
STRUCTURAL APPLICATIONS
1)Nanocrystalline ceramic are produced by sinter forging which uses the superplasticity of the material itself by closing pores with aid of plastic flow.
2)The development of nanocrystalline M50 steel as the shaft bearing materials
has improved the performance of engines
in gas turbine industries.
3)development of WC-CO nanocomposites has been driven by expectation of obtaining cutting tools and hard metal coatings.
CARBON NANOTUBES
TYPES
1)Single walled carbon nanotubes
(SWCNTs)
2)Multi walled carbon nanotubes
(MWCNTs)
STRUCTURE
The structure of a carbon nanotube is formed by a layer of carbon atoms that are bonded together in a hexagonal (honeycomb) mesh.
SYNTHESIS
Electric arc discharge
Chemical vapor deposition
1)Hot wall CVD method
2)Cold wall CVD synthesis
Laser ablation method
High pressure carbon monoxide method
APPLICATIONS
1)Energy storage
2)Drug delivery
3)Magnetic force microscopy
4)microwave absorption
HEALTH ISSUES
1)Lung inflammation
2)Heart problems
3)Free radicals causing cell damage and damage to DNA
4)Cytotoxicity
5)Increased oxidative stress
ENVIRONMENTAL ISSUES
1)Contaminate soil, migrate into surface and ground waters.
2)Accidental spillages can be transported to water systems through wind or rain water runoff.
3)Affect water purification system, energy system, physical enhancement
NAME:JEEVITHA P
ROLL NO:196012
SUBJECT:NANOMATERIALS
SUB CODE:18MTE61
