applications of colloids

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APPLICATIONS OF COLLOIDS

BAZLA SIDDIQUI

OVERVIEW

What are colloids? Applications of colloids Pharmaceutical apllications. Industrial applications Other applications Conclusion.

INTRODUCTION

DEFINITIONColloidal System is the heterogenous biphasic system dispersed phase ranges within 1-10

angstrom to few micrometres in dimensions.

differs from other heterogenous and homogenous solutions in terms of the size of dispersed phase.

APPLICATIONS OF COLLOIDS Colloids play an important role in

pharmacy,in our daily life and in industries.

A few of the important applications of colloids are listed below.

PHARMACEUTICAL APPLICATIONS

PHARMACEUTICAL APPLICATIONSTHERAPY Colloidal system are used as therapeutic

agents in different areas. Colloidal medicines being finely divided,

are more effective and are easily absorbed in our system.

Penicillin and streptomycin .EYE LOTIONS:Argyrol and protargyrol

PHARMACEUTICAL APPLICATIONS

COLLOIDAL SULPHUR:Absorbed efficiently in colloidal forms.COLLOIDAL COPPER:In treatment of cancer.COLLOIDAL GOLD:Diagnostic agent for paresis.COLLOIDAL MERCURY:In treatment of syphilis.

PHARMACEUTICAL APPLICATIONS

NATURAL COLLOIDS Plasma protein.COLLOIDAL ELECTROLYTES. Increase solubility,stability and taste of

compounds,in lyophillic colloids.STABILITY OF DRUGS: lyophobic colloids. and prevent flocculation .

gelatin coating over tablets and granules.

For protection. DISSOLUTION AND

ABSORBTION: Both enhance due to huge

surface area. sulphur colloid.

PHARMACEUTICAL APPLICATIONS

TARGETED DRUG DELIVERY: Liposomes. Vessicles of phospholipids. As a drug carrier to promote controlled

release of drug in body. Taken up by the liver and spleen.

APPLICATIONS IN FOOD INDUSTRY: Many of our foods

are colloidal in nature.

Milk is an emulsion of butterfat in water protected by a protein, casein.

Salad dressing, gelatin deserts, fruit jellies.

Ice cream & Bread.

INDUSTRIAL APPLICATIONS

NON-DRIP PAINTS: All paints are colloidal

dispersions of solid pigments in a liquid medium.

paints also contain long-chain polymers.

At rest, the chains of molecules are coiled.

stress is applied with a paint brush, the coiled molecules straightened.

This renders the paint ‘non-drip’.

INDUSTRIAL APPLICATIONS

Sewage disposal: Colloidal particles of the dirt, mud etc.

carry electric charge. the colloidal particles are coagulated when

sewage water is passed through the plates kept at a high potential.

the suspended matter gets removed.

INDUSTRIAL APPLICATIONS

Cleansing action of soap: Soap solution is colloidal in nature.

It removes the dirt particles either by adsorption or by emulsifying.

OTHER APPLICATIONS

Photography:A colloidal solution of silver bromide in gelatin is applied on glass plates or celluloid films to form sensitive plates in photography.

OTHER APPLICATIONS

OTHER APPLICATIONS

Clarification of Municipal water: The municipal water contains colloidal

particles. Alum which yield ions, Al3+ is added to

water to coagulate the negatively charged clay particles.

Al3+ + 3H2O ---- Al(OH)3 + 3H+

Al(OH)3 + 4H2O + H+ ----- Al(OH)3(H2O)4

OTHER APPLICATIONS

Artificial Kidney machine: The human kidneys purify the blood by

dialysis through natural membranes. The toxic waste products such as urea and

uric acid pass through the membranes colloidal-sized particles of blood proteins

(haemoglobin) are retained

OTHER APPLICATIONS

The phenomenon of the scattering of light by the sol particles is called Tyndall effect.

CONCLUSION:

A knowledge of colloid chemistry is essential to understand some of the various natural phenomena around us.

Colloids make up some of our modern products.

Dialysis,life saving treatment.

QUESTIONS?