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7/27/2019 Ppt 3 Green Trend
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COLLEGE OF ENGINEERING, GUINDY,
ANNA UNIVERSITY,
CHENNAI - 600025
Green Trends in Metallurgy using Nano Technology
Ramkumar.R[3rd year B.E.,]
DEPT. OF MANUFACTURING ENGG.
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Non-conventional Energy sources
Solar Energy
Wind Energy
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ENERGY EXPENSIVE
PROCESSES
Efficient
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ENERGY EXPENSIVE
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A+B C+DHigh T
Look for a Low T Alternative Route
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Eco friendliness
Zero wastage
Energy efficiency
GREEN TECHNOLOGY
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METALLURGY
Extraction of metals from the
ores
Production of Inter metallic
compounds and alloys
Heat treatment of metals aswell as alloys
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What is common to all these
Metallurgical processes?
Heating at High Temperatures
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NANOTECHNOLOGY
Nano Technology is the creation of
useful / functional materials,
devices and systems through
control / manipulation of matter
on the Nanometer length scale and
exploitation of novel phenomena,properties which arise because
of the Nanometer length scale.
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One nanometer = 10-9 meter
1m
1,000,000,000
One billionth of a meter!
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NANOTECHNOLOGY
Properties undergo dramatic changes at
the Nanoscale.
They have vastly increased surface area
per gram .
They have very large surface to volume
ratios .
They have enhanced reactivity compared
to large size particles.
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NANOTECHNOLOGY
Due to this enhanced reactivity,
low temperature processesare feasible.
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Metallic salts
(Precursor)
Prereduced metal nano particles
Nano Composites
Intermetallics and Alloys
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LOW TEMPERATURE SOLUTION BASED
NANOPARTICLE METHOD
Combinations of Ag-Pt, Au-Pd, Co-Pt, Cu-
Pt, Fe-Pt, Ni-Pt, Au-Pd were studied.
Reducing agent : NaBH4
Solvent : water
Stabilizer : Poly VinylPyrrolidone (PVP)
Temperature : Around 3000
C Time : Around 30 min to 2 hrs
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CHARACTERISATION TECHNIQUES
Powder X-ray diffraction (XRD)
Differential scanning calorimetry (DSC)
Inductively coupled plasma (ICP)
Massspectroscopy
X-ray photoelectron spectroscopy (XPS)
Transmission electron microscopy (TEM) Scanning electron microscopy (SEM)
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TYPICAL EXAMPLE OF XRD STUDY OF AN ALLOY
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TRADITIONAL METHOD NANOPARTICLE METHOD
Temperature > 10000C
Time : > 24 hrs
Energy expensive
More pure
Temperature : 3000C
Time : 30 min to 2 hrs
Energy efficient
Less pure ,but
comparable properties
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DIVERSE FUNCTIONAL USES
Selective catalysis
Ferromagnetism
Superconductivity
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Morphologically diverse products
surface-confined thin films
free-standing monoliths
nanomesh materials dense gram-scale nanocrystalline
powders
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REFERENCES
1. Sra, A. K.; Schaak, R. E. J. Am. Chem.
Soc. 2004, 126, 6667-6672.2. Sra, A. K.; Schaak, R. E. J. Am. Chem.
Soc. 2005, 127, 3506 - 3515
3. Web resources about Green Technology
and NanoTechnology
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