ppt 3 green trend

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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ppt 3 green trend

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