Topology, structure and defects in carbon nanosystems
Description
In this talk we will explore how in the last twenty years carbon science has made the fundamental step from the flat world of graphite into the three dimensional world of fullerenes and nanotubes, the building blocks of the carbon nanotechnology revolution. We will look at the history of the discovery of buckminsterfullerene and carbon nanotubes, and explore analogies in diverse fields of biology, architecture and sport. The understanding of defects in nanocarbons is essential in order to control their diverse properties. For example irradiating bundles of carbon nanotubes produces defects which increase their bending strength by a factor of 16. At the same time such defects can store energy and were the cause of the UK “Windscale” nuclear fire in the 1950s. Recent advances in computational modelling and electron microscopy mean that we now have a much better understanding of the structure, formation and evolution of intrinsic defects, opening up the intriguing possibility of selective spatial creation of defects – atomic level defect engineering.
| Slides | |
| 0:00 | Topology, structure and defects in carbon nanosystems |
| 1:53 | Institute of Materials Nantes, France |
| 2:16 | slide3 |
| 2:29 | In English often called a “lead pencil” Not correct! It´s actually GRAPHITE One of the pure forms of carbon |
| 2:46 | Carbon |
| 3:07 | slide6 |
| 3:36 | slide7 |
| 3:55 | 3 equivalent bonds leads to formation of hexagons |
| 3:56 | slide9 |
| 4:14 | Graphite sheets are flat |
| 4:23 | slide11 |
| 5:05 | slide12 |
| 5:46 | Graphite Electrodes |
| 6:02 | Vacuum |
| 6:07 | Generate a large electric spark between two graphite electrodes, and study the soot that comes off… |
| 6:20 | Exxon Data Cox et al JACS 110 1588 (1988) |
| 7:17 | slide17 |
| 7:31 | slide18 |
| 7:50 | C60 Buckminsterfullerene “Buckyball” |
| 8:03 | Generate a large electric spark between two graphite electrodes, and study the soot that comes off… |
| 8:16 | How do we make a pentagon from graphite? |
| 8:22 | How do we make a pentagon from graphite?01 |
| 8:28 | How do we make a pentagon from graphite?02 |
| 8:32 | How do we make a pentagon from graphite?03 |
| 8:56 | Pentagon |
| 8:59 | 12 pentagons and any number of hexagons will form a closed object |
| 9:16 | slide27 |
| 9:27 | Zoran Pavlovic |
| 9:32 | Jonathan Hare Creative Science Centre |
| 9:59 | H. Kroto |
| 10:10 | H. Kroto01 |
| 10:17 | H. Kroto02 |
| 10:22 | H. Kroto03 |
| 10:23 | H. Kroto04 |
| 10:39 | slide35 |
| 10:44 | Ernst Haeckel The Art of Nature 1900 |
| 11:04 | Ernst Haeckel The Art of Nature 1900 01 |
| 11:08 | Ernst Haeckel The Art of Nature 1900 02 |
| 11:23 | slide39 |
| 11:33 | slide40 |
| 11:35 | From patent application of R. Buckminster Fuller for “geodesic dome”. |
| 11:52 | From patent application of R. Buckminster Fuller for “geodesic dome”. |
| 12:12 | slide43 |
| 12:15 | EPCOT Centre, Florida, USA |
| 12:20 | Buckminster Fuller On the cover of Time Magazine |
| 12:24 | Buckminster Fuller On the cover of Time Magazine |
| 12:26 | Buckminster Fuller On the cover of Time Magazine |
| 12:30 | How else can we go from flat to curved? |
| 12:49 | Nanotube |
| 12:59 | slide50 |
| 13:28 | slide51 |
| 13:48 | Typical Nanotube Properties |
| 13:59 | Typical Nanotube Properties01 |
| 14:25 | Harry Kroto |
| 14:38 | Harry Kroto01 |
| 14:45 | Nanotube flexing |
| 15:11 | Arc-electric process makes nanotubes too (as for C60) |
| 15:19 | © Calvin (2006) |
| 15:27 | slide59 |
| 15:32 | slide60 |
| 15:52 | M. Endo (Shinshu University) |
| 16:10 | slide62 |
| 16:24 | Also Multi-walled Carbon Nanotubes (tubes within tubes) |
| 16:37 | 64 |
| 16:52 | Single walled nanotubes containing Li metal produced by electrolysis |
| 17:05 | 1nm |
| 17:08 | Electronic Properties? |
| 17:13 | Electronic properties depend on how the tubes are rolled, and what diameter they have. |
| 17:45 | Cees Dekker, Delft Institute of Technology, the Netherlands |
| 17:53 | A nanotube transistor using conventional silicon as the “gate” (switch) |
| 18:00 | The “kink” separates metallic and semi-conducting regions |
| 18:13 | Current-voltage characteristics across the kink at 100 K. |
| 18:20 | Nanotubes for field-emission |
| 18:36 | Spinning fibres with a composite of carbon nanotubes and a polymer matrix |
| 19:39 | Damaging Nanotubes |
| 19:49 | Damaging Nanotubes 01 |
| 20:48 | Defects improving mechanical properties |
| 21:53 | Defects improving mechanical properties01 |
| 23:06 | Defects reducing mechanical properties |
| 24:00 | Defects reducing mechanical properties01 |
| 24:30 | Defects reducing mechanical properties 02 |
| 25:30 | “Active Sites” also good for… |
| 27:20 | How to induce ‘active sites’? |
| 27:39 | Convergence |
| 28:08 | Electron microscopy of ‘pea-pod’ defects |
| 28:45 | Electron microscopy of ‘pea-pod’ defects 01 |
| 29:27 | Electron microscopy of ‘pea-pod’ defects 02 |
| 30:25 | What happens when we shine an electron beam on a carbon nanotube? |
| 30:57 | What happens when we shine an electron beam on a carbon nanotube? 01 |
| 31:15 | Molecular dynamics simulations of emission process |
| 32:13 | Calculation of the ejection energy threshold through DFT methods |
| 32:29 | Emission energy threshold anisothropy |
| 32:50 | Below the irradiation energy threshold |
| 33:26 | Below the irradiation energy threshold 01 |
| 34:27 | Below the irradiation energy threshold 02 |
| 34:40 | Just above the irradiation energy threshold |
| 35:39 | slide97 |
| 36:03 | slide98 |
| 36:11 | Thanks to… |
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