Slide 1: COIMBATORE INSTITUTE OF TECHNOLOGY
(AN AUTONOMOUS INSTITUTION AFFILIATED TO ANNA UNIVERSITY) PAPER PRESENTATION ON:
AND ITS USES SMART MATERIALS AND ITS USES : SMART MATERIALS AND ITS USES DEFINITION: : DEFINITION: Smart materials are materials that have more properties that can be significantly changed by external stimuli such as stress, temperature pH, electric or magnetic fields. EXAMPLES OF SMART MATERIALS: : EXAMPLES OF SMART MATERIALS: v Shape Memory Alloys
v Piezoelectric materials
v Electro- rheostatic materials
v Magneto- rheostatic materials,
v Smart Gels
v Optical Fibres
v pH sensitive polimers
v temperature-responsive polymer SHAPE MEMORY ALLOYS: : SHAPE MEMORY ALLOYS: - Shape-Memory Alloys are metals that at a certain temperature revert back to their original shape. PIEZOELECTRIC MATERIALS: : PIEZOELECTRIC MATERIALS: - when electrical current is passed, piezoelectric material increases in size up to a 4%.
- the airbag sensor is an example of piezoelectric material ELECTRO-RHEOSTATIC AND MAGNETO-RHEOSTATIC: : ELECTRO-RHEOSTATIC AND MAGNETO-RHEOSTATIC: - when it exposed to magnetic or electric substance it change from thick fluid into solid substance.
- MR fluids experience a change in viscosity.
- ER fluids can be as simple as milk chocolate or cornstarch and oil. LYCRA: : LYCRA: - It is a stretchy artificial fibre.
- stretchy section make the cloth soft.
- rigid section make the cloth tougher than rubber. USES OF LYCRA: : USES OF LYCRA: - make sports clothing such as wetsuits.
- it is lightweight.
- doesn’t get damaged by sunlight, detergent. THINSULATE: : THINSULATE: - Thinsulate fibres are thin artificial fibres.
- It trap a lot of air and reflect heat.
- so clothes containing this material keep you very warm. pH & TEMPERATURE-SENSITIVE POLYMER: : pH & TEMPERATURE-SENSITIVE POLYMER: - pH sensitive polymers are materials which will respond to the changes in the pH of the surrounding medium by varying their dimensions.
- A temperature-responsive polymer is a polymer which undergoes a physical change.
- use as extraction compounds, surface modifiers, drug delivery, and gene delivery. WONDERFUL APPLICATIONS OF SMART MATERIALS: : WONDERFUL APPLICATIONS OF SMART MATERIALS: -Active Control Inceptors Using Smart Material Motion Control.
-Removing toxic pollutants from water.
-Advanced liquid crystal displays.
-to find the stealth airplanes, submarines.
-to determine the defects in bridges, buildings. REMOVING TOXIC POLLUTANTS FROM WATER: : REMOVING TOXIC POLLUTANTS FROM WATER: - chlorinated phenols are a common water contaminant.
- Smart material zinc oxide could degrade organic. WORKING OF ZnO: : WORKING OF ZnO: - detects the contaminates.
- when exposed to UV light, ZnO aids in the breakdown of the contaminates.
- ZnO convert the pollutants into harmless byproducts.
- ZnO film begins to glow brightly that indicate the job is done. CONCLUSION: : CONCLUSION: These "smart materials" are just starting to emerge from the laboratory, but soon you can expect to find them in everything from laptop computers to concrete bridges.