1. SEMESTER-II Title of the paper: Physical & Genaral chemistry
SURFACECHEMISTRY
SEMESTER-II
Title of the paper: Physical & Genaral chemistry

2. D K GOVT COLLEGE FOR WOMEN (AUTONOMOUS) NELLORE
SURFACE CHEMISTRY

3. BY Dr E.PREMALATHA LECTURER IN CHEMISTRY D K GOVT COLLEGE (A) FOR WOMEN NELLORE

4. SYLLABUS UNIT-IV Surface chemistry
colloids, sols preparation, purification, properties - physical, electrical. Stability of colloids, Hardy-Schulze law, protective colloid.
Emulsions preparation, properties, uses. Gels preparation, uses.

5. Definition of colloids
 A homogeneous non-crystalline substance consisting of large molecules or ultramicroscopic particles of one substance dispersed to another substance .

6. PREPARATION OF COLLOIDS

9. LYOPHOBIC SOLS Dispersion method Condensation methods
Mechanical Dispersion
Electro Dispersion
Ultrasonic Dispersion
Peptization
Exchange of solvents
Change of physical state
Chemical Methods
(i) Double decomposition
(ii) Oxidation
(iii) Reduction
(iv) Hydrolysis

11. ELECTRO-DISPERSION METHOD This method is suitable for the preparation of colloidal solutions of metals like Gold, Silver, Platinum, ect

12. ULTRASONIC DISPERSION The sound waves of high frequency are usually called ultrasonic waves.

13. ULTRASONIC DISPERSION

14. PEPTIZATION

16. 1.Chang of physical state 2.Exange of solvent

21. ELECTRO PHORESIS
ELECTRO OSMOSIS

22. Hardy - schulze Law coagulation or precipitation

23. Protective Colloids- Gold Number

25. Liquid in Liquid colloids -EMULSIONS

26. Liquid in solids- GELS