記録された日時: November 13 2008

Duration: 01 hours 08 minutes 29 seconds

'Nano' is all about small. A dispersed system is smaller than its agglomerated or aggregated precursor. Dr Alan Rawle rambles through the fundamental physical principles outlining dispersion, solid bridging and the importance of the surface
Table of contents
1. Dispersion and Nanotechnology
02:44
2. Dispersion and nanotechnology
00:02
3. Can I say anything new?
01:00
4. Abstract
00:36
5. The Laws of Physics or The Crunch You call me a crunchie and I’ll take you outside And I’ll show you just how the crunch is applied David Kramer
00:58
6. The 3 S’s
01:26
7. Bulk/Primary: solid bridging; room temperature sintering
00:48
8. Solid-solid diffusion
01:15
9. Gas Phase Particle Growth
01:15
10. Untitled
00:35
11. Inertial and van der Waals forces…..
01:09
12. Bridging will always occur - in the dry state!
00:42
13. Attractive (van der Waals) and inertial forces
00:39
14. Attractive (van der Waals) and inertial forces
00:27
15. Attractive (van der Waals) and inertial forces
01:17
16. Surface and size
00:58
17. Gas adsorption techniques (e.g. BET)
00:50
18. Gas adsorption techniques (e.g. BET)
00:22
19. Using the BET model to measure surface area
00:29
20. Comparison with laser diffraction
00:52
21. Gas adsorption techniques (BET)
01:01
22. Gas adsorption techniques (BET)
00:10
23. Gas adsorption techniques (BET)
00:56
24. Qualitative Measure of Dispersion Efficiency
01:14
25. Surface – the 3 C’s
01:30
26. Surface sensitive techniques
01:30
27. Inverse GC DPI
00:56
28. Differential Polarization Interferometry See: http://www.farfield-scientific.com/pdfs/doubling.pdf And plenty of Webinars…
00:39
29. Differential Polarization Interferometry
00:44
30. Surface Composition/chemistry
02:23
31. TiO2 pigment
01:17
32. TiO2 coatings
01:06
33. The scale of the issue
01:43
34. TiO2 – pictures and plots... Confusing….
00:37
35. So is this reasonable, for example?
00:39
36. Composition
01:30
37. Surface atoms dominate as the size decreases Adapted from: Professor André Nel, Division of Nanomedicine, University of California, Los Angeles http://www.dtsc.ca.gov/TechnologyDevelopment/Nanotechnology/upload/03_Nel.pdf
00:25
38. Nanoclusters See: http://sces.phys.utk.edu/~dagotto/condensed/Magnetic%20Nanoclusters.pdf
00:40
39. Chemisorption induced segregation
00:27
40. Chemisorption induced segregation
00:27
41. Alloys – surface properties
01:04
42. Pd-Au and Pd-Ag alloys
01:20
43. Charge
00:58
44. Zeta potential
00:19
45. Producing a stable dispersion
01:32
46. Titanium dioxide D50 = 0.25 mm approx. Calgon additive
00:36
47. CeO2
00:21
48. Indications that there is a stability issue Removal of ultrasound in DI water - BDAS
00:54
49. Stability studies with Zeta3000HS plus titrator
01:25
50. Stability studies with Zeta3000HS plus titrator
00:46
51. Measurement with optimum conditions Before, during and after ultrasound
00:29
52. Measurement with optimum conditions Before, during and after ultrasound Pre-dispersion (250W u/s 15 minutes) in 0.15% Calgon Measurement in 0.15% Calgon solution
00:33
53. Comparison between properly dispersed and poorly dispersed material
00:18
54. Corona
00:46
55. Skip Rung, President and Executive Director, ONAMI – Blog - referring to recent ILS’s in nano
00:46
56. Powders are also a problem! Kendall
00:48
57. Powder
01:17
58. Adhesion forces - dry milling Theoretical limit of a ball mill
00:38
59. Nanopowder…..
00:30
60. Dissolution
00:59
61. Stress Corrosion Cracking
00:47
62. Tests for “nano”
02:18
63. Settling rates – taken from E2490 Standard Practice Guide for Measurement of particle size distribution of nanomaterials in suspension by Photon Correlation Spectroscopy (PCS) ASTM E56.02
01:12
64. Settling rates - comment
00:51
65. Drexler
00:30
66. K. Eric Drexler
00:16
67. Ladybug - 35mg Elephant – cow – not bull – 3500kg
00:40
68. Heywood – we expect a quote! (Lunar dust)
01:15
69. Thank you
03:30
70. Contact Information
02:33