SELVAMM ARTS SCEINCE COLLEGE (AUTONOMOUS)

DEGREE OF MASTER OF SCEIENCE IN PHYSICSSubmitted by

S.SOUNDARRAJAN

CHEMICAL AND CATALYTIIC ASPECTS OF NANOCRYSTALS

Introduction Chemical properties Surface chemistry process Nanomaterial in catalysis

Plane of talk

Physicist Richard Feynman ,The father of nanotechnology

Introduction

Plenty of Room at the Bottom

… But there is plenty of room to make them smaller The idea behind nanotechnology originated with Nobel Laureate Richard Feynman nearly 50 years ago.There is nothing that I can see in the physical law that says the elements cannot be made enormously smaller than they are now. ….

Richard Feyman

December 29, 1959

The annual meeting of the American Physical Society at Caltech

Nanotechnology

Nano science and nanotechnology are the study and application of extermely small things and can be used across all the other science fields , such as chemistry , physics ,biology , materials science , and engineering.

just how small nanotechnology is are nanometer is a nm

1 m 10 cm 1 cm 100 m

10 m 1 m 100 nm 10 nm

Surface featuresNanocrystal superlatticesDiblock copolymers and others including

catalysis

Chemical properties

CorrosionAdsorptionOxidationReductioncatalysis

Surface chemistry is very importance in numerous process such as

corrosion

Adsorption and Absorption

Oxidation and Reduction

catalysis

Nanomaterials in catalysisMetallic nanoparticles exhibit different catalytic activities as

followsElectronic effectsSupport effectsShape effects

Recent progressMetal oxides and sulfides

Electron density charges may be vary due to

particle sizeEx: Nickel

Electronic effects

Small metal particle bound to a

metal oxide surface can be affected electronically by the

nature of metal oxidemgo

Support effects

Shape effects

Recent progress

Methanol synthesis over a zno catalysist is well known+OH+

metal oxides and sulfides

THANK YOU