7. 3. Carbon Nanotubes (CNT) 1939 – First commercial versions of TEM produced by Siemens 1952 – First documented (TEM) evidence of nano-sized carbon filaments was published in Journal of Physical Chemist in Russia [1] 1991 – MWCNT brought to prominence by Iijima in 1991 in Nature 1993 - SWCNT discovered
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11. 4. Comparing Physical and Chemical Parameters of Asbestos and Carbon Nanotubes PHYSICAL and CHEMICAL PARAMETERS ASBESTOS CARBON NANOTUBES Shape Size Chemistry Surface Reactivity Biopersistence
12. PHYSICAL and CHEMICAL PARAMETERS ASBESTOS CARBON NANOTUBES Shape More organized Bundles Or Single Fibers Aggregates, Ropes, Clumps up tp 3 μ m in diameter Size Chemistry Surface Reactivity Biopersistence
13. Shortest Length SW Cycloparaphenylene Shortest DiameterSW Grown inside MWCNT Longest SW 18.5 cm PHYSICAL and CHEMICAL PARAMETERS ASBESTOS CARBON NANOTUBES Shape More organized Bundles Or Single Fibers Aggregates, Ropes, Clumps up tp 3 μ m in diameter Size ( diameter x length) Chr ( 25-100nm x 1- 50 μ m) Amo (100-200nm x 1-30 μ m) SW ( .4-3nm x 3Å-18.5cm) MW ( 2-200nm x 1nm-3cm) Chemistry Surface Reactivity Biopersistence
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15. Hydrophillic Amphiboles, once inside, adsorb phospholipids and proteins - complex coat of apatite minerals and aggregates (possible further research with CNT) PHYSICAL and CHEMICAL PARAMETERS ASBESTOS CARBON NANOTUBES Shape More organized Bundles Or Single Fibers Aggregates, Ropes, Clumps up tp 3 μ m in diameter Size ( diameter x length) Chr ( 25-100nm x 1- 50 μ m) Amo (100-200nm x 1-30 μ m) SW ( .4-3nm x 3Å-18.5cm) MW ( 2-200nm x 1nm-3cm) Chemistry Presence of metals May also contain metals Surface Reactivity Hydrophilic Hydrophobic (unless functionalized) Biopersistence
16. PHYSICAL and CHEMICAL PARAMETERS ASBESTOS CARBON NANOTUBES Shape More organized Bundles Or Single Fibers Aggregates, Ropes, Clumps up tp 3 μ m in diameter Size ( diameter x length) Chr ( 25-100nm x 1- 50 μ m) Amo (100-200nm x 1-30 μ m) SW ( .4-3nm x 3Å-18.5cm) MW ( 2-200nm x 1nm-3cm) Chemistry Presence of metals May also contain metals Surface Reactivity Hydrophilic Hydrophobic (unless functionalized) Biopersistence Short - Not Long - Amosite is Tangled – length dependent [2] Long/Singlet - ???
