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AEROGEL
Aerogel is a porous solid material with unique properties such as low density, excellent thermal insulation, and high surface area, first developed in 1931 by Samuel Kistler. There are various types of aerogel based on materials (like silica, metal oxides, and carbon) and temperature applications, including cryogel, spaceloft, and pyrogel. Applications span multiple fields, including space research, hydrogen storage, and building insulation.
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Overview of recent trends in chemical engineering with a focus on aerogels, their definition, and historical context of creation.
Key properties of aerogels including low density, thermal insulation, compressive strength, and waterproof features.
Different types of aerogels by material and application temperature, showcasing silica, metal oxide, and carbon aerogels.
Diverse applications of aerogels including use in space research, sound insulation, and energy efficiency solutions.
Acknowledgment of references used in the presentation and expression of gratitude for the audience's attention.
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AEROGEL
- 1. RECENT TRENDS INCHEMICAL ENGG. AEROGEL
- 2. WHAT IS ANAEROGEL ? ? ? • AEROGEL is essentially the solid framework of a gel • A class of porous, solid materials that exhibit extreme material properties • A Nanostructured Material with Fascinating Properties and Unlimited Applications
- 3. HISTORY OF AEROGEL Aerogel was first created by Samuel Stephens Kistler in 1931. The first aerogels were produced from silica gels. Kistler's later work involved aerogels based on alumina, chromia and tin dioxide. Carbon aerogels were first developed in the late 1980s.
- 4. PROPERTIES: Extremely lowdensity Very good thermal insulator High specific surface area Lowest dielectric constant
- 5. PROPERTIES: ultimate compressive strength,compressive modulus. flexibility, modulus of flexure. Water proof material.
- 6. TYPES OF AEROGEL On basis of Material Silica Metal oxide Carbon On basis of temperature Cryogel - for low- temperature applications (-200°C - 90°C); Spaceloft - for mid- temperature applications (-200°C – 200°C); Pyrogel - for high- temperature applications ( up to 650°C
- 7. SILICA AEROGEL • highspecific surface area (500–1200 m2/g) • high porosity (80–99.8%) • low density (∼0.003 g/cm3) • high thermal insulation value (0.005 W/mK) • ultra low dielectric constant (k= 1.0–2.0) • low index of refraction (∼1.05)
- 8. METAL OXIDE AEROGEL •Density 0.070 g cm-3 • Surface area 340 m2 g-1 • Pore volume 1.25 cm3 g-1 • Average pore diameter 12 nm
- 9. CARBON AEROGEL Carbonaerogels are composed of particles with sizes in the nanometer range. covalently bonded together with pore diameter under 100 nm.
- 10. APPLICATION IN SPACERESEARCH Thermal insulation for planetary landers and rovers Insulation of cryogenic propulstion system
- 11. AEROGEL AS STARDUST COLLECTOR a section of aerogel as part of its Stardust probe to collect samples of material from the tail of comet;
- 12. GENERAL FIELDS OFAPPLICATION Hydrogen storage Magnetic media An excellent sound insulator
- 13. GENERAL FIELDS OFAPPLICATION daylight panels. Insulation of windows and sections of the roof. As water proofing agent.
- 14. REFERENCE www.aerogel.com JohnF. Poco, Joe H. Satcher , and Lawrence , Synthesis of high porosity, monolithic alumina aerogels, Journal of Non-Crystalline Solids, 285, 57-63 (2001).
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