nanoscience

1. SELVAMM ARTS SCEINCE COLLEGE
(AUTONOMOUS)
DEGREE OF MASTER OF SCEIENCE IN PHYSICS
Submitted by
S.SOUNDARRAJAN
CHEMICAL AND CATALYTIIC ASPECTS
OF NANOCRYSTALS

2.  Introduction
 Chemical properties
 Surface chemistry process
 Nanomaterial in catalysis
Plane of talk

3. 
 Physicist Richard Feynman ,The father of
nanotechnology
Introduction

4. 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

5. 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
10−9
nm

6. 1 m 10 cm 1 cm 100 m
10 m 1 m 100 nm 10 nm

7. Surface features
Nanocrystal superlattices
Diblock copolymers and others
including
catalysis
Chemical properties

8. Corrosion
Adsorption
Oxidation
Reduction
catalysis
Surface chemistry is very importance in
numerous process such as

9. corrosion

10. Adsorption and Absorption

11. Oxidation and Reduction

12. catalysis

13. Nanomaterials in catalysis
Metallic nanoparticles exhibit different
catalytic activities as follows
Electronic effects
Support effects
Shape effects
Recent progress
Metal oxides and sulfides

15. Electron density charges may
be vary due to particle size
Ex: Nickel
Electronic effects

16. Small metal particle bound to a
metal oxide surface can be affected
electronically by the nature of metal
oxide
mgo→ 𝑚𝑔 + 𝑜
Support effects

17. Shape effects

18. Recent progress

19. Methanol synthesis over a zno
catalysist is well known
𝑐𝑜2+3𝐻2 → 𝐶𝐻3OH+𝐻2 𝑂
metal oxides and sulfides

20. THANK YOU