Applications of colloids
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Transcript of Applications of colloids
TrainingLearning to Work Efficiently and Accurately
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?