Date recorded: August 13 2015

Duration: 52 minutes 01 seconds

The movement of particles in a colloidal suspension is the property we use in order to characterize the size distribution (via the Stokes-Einstein equation). We'll look at diffusion including the random Brownian motion that we require for valid application of the equation but also outlining scenarios where such random motion does not occur (e.g. in nematic liquid crystals) where other interesting information can be obtained.

Table of contents
1. Welcome
00:55
2. Abstract
01:57
3. CTN Lindhard Lecture Peter Hänggi, University of Augsburg“The Ring of Brownian motion: the good, the bad and the simply silly”
00:55
4. Key Historical figures
00:49
5. video
00:35
6. Common Error
01:15
7. Robert Brown – he lived on the outside of town*
00:38
8. particle
00:37
9. First practical usages
01:03
10. Théorie de la Spéculation
00:23
11. Gas molecules – Graham’s Law - 1848
01:01
12. Application of Graham’s law
01:31
13. Solid-in-liquid (oh and heat)
01:12
14. Fick’s second law – non-steady state
01:04
15. Derivation of Einstein’s equation for diffusion (after Perrin)
00:50
16. Fick’s Laws
00:31
17. Fick’s Second Law
00:39
18. Application to topical formulations
00:31
19. The general gas law
01:16
20. Arrhenius
00:27
21. Importance in solid-solid diffusion
00:31
22. Temperature dependence – Arrhenius and van’t Hoff
01:00
23. Temperature dependence – Arrhenius and van’t Hoff
00:42
24. An aside – the importance of numbers…
00:42
25. The atom and molecules
00:51
26. Jean (Baptiste) Perrin
01:19
27. Perrin – 1909J B Perrin “Mouvement brownien et réalité moléculaire” Ann. Chim. Phys., 8e Ser. 18 5–114 (1909)
00:50
28. Particle Tracking – 1909 style
00:43
29. Original plotsJ B Perrin “Mouvement brownien et réalité moléculaire” Ann. Chim. Phys., 8e Ser. 18 5–114 (1909)
00:26
30. Perrin – but also Henri (1908) before Perrin…..
00:41
31. Victor Henri
00:29
32. Perrin’s calculations:
01:16
33. Solid-in-gas systems – dispersal of smoke…
01:12
34. Maurice de Broglie Comp. Rendus 1909 1163-1164
00:28
35. Picture of Brownian motion is pretty poor!
00:16
36. Professor Sir Oliver Graham Sutton, C.B.E., D.Sc., F.R.S. Chairman, Atmospheric Pollution Research CommitteeSuperintendent at the Radar Research and Development Establishment, Malvern (1945-47)
00:57
37. von Smoluchowski - 1906
00:50
38. Liquid systems – Stokes-Einstein
00:33
39. Einstein..
00:59
40. Einstein
00:35
41. Solid systems
00:57
42. Bakerian Lecture - á la Michael Faraday
00:39
43. Roberts-Austen - 1896
00:33
44. Roberts-Austen
00:32
45. Von Hevesy (Hevesy György) - George von Hevesy
01:05
46. Gróh/Von Hevesy Ann. Physik, 65, 216 – 222 (1921)
00:29
47. Rutherford to von Hevesy…and other stories
01:32
48. Atomic diffusion (‘doping’) in semiconductors
00:45
49. The semiconductor revolution
00:32
50. Solid-solid diffusion
01:10
51. paper
00:22
52. paper
00:29
53. Adhesion forces - dry millingTheoretical limit of a ball mill
00:41
54. NTA/PTA
00:14
55. NTA/PTA
01:20
56. Chandrasekhar - 1943
00:33
57. Chandrasekhar - 1943
00:54
58. Roy Pike – Nature - 1970
00:31
59. Leading on to….
00:24
60. Non random motion
00:55
61. Non-isotropic diffusion
00:34
62. Turiv et al
00:19
63. Turiv 2
00:27
64. References
00:33
65. Thank you!
00:39
66. Thank you for your attentionAny questions?Please type your questions in using the Q&A panel on the right side of your screen
01:23
67. Contact Information
00:00