Nanotechnology - dispersion and other issues

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00:00:00 Nanotechnology – dispersion and other issues
00:01:33 Introduction
00:02:25 Format
00:03:25 Nanotechnology
00:04:48 Eric Drexler
00:05:33 Ladybug - 35mg Elephant – cow – not bull – 3500kg
00:06:17 Nanotechnology
00:07:40 New public (free) standard from ASTM http://www.astm.org
00:08:20 PAS71 from BSI, UK
00:08:58 Nanotechnology – dispersion and other issues
00:09:50 Aggregates/agglomerates
00:11:27 Definitions
00:12:57 Particle-particle interactions
00:14:36 In infinite dilution…..
00:16:02 Van de Waals forces
00:17:29 Van der Waals (from Wikipedia)
00:18:05 London-van der Waals Force
00:19:04 VDW (continued)
00:19:46 Why can a gecko walk on the ceiling?
00:20:56 Why can a gecko walk on the ceiling?
00:21:01 Evidence
00:21:32 Why can a gecko walk on the ceiling?
00:21:36 Strength of adhesion
00:23:12 Dry analysis
00:24:33 Rumpf - agglomerate strengths
00:25:41 Gold
00:26:25 Fick’s Law of diffusion
00:27:28 Thus….
00:28:50 Bulk/Primary: solid bridging; room temperature sintering
00:30:50 Evolution of Dispersion Methods
00:31:41 TiO2
00:32:41 Comparisons
00:32:56 Gas phase nanoparticle sintering
00:33:05 Gas phase nanoparticle sintering
00:34:13 Solid-solid diffusion
00:34:52 Knowledge is Power…
00:35:12 Knowledge is Power… Date: 1850…
00:35:32 Bridging will always occur - in the dry state!
00:36:10 Adhesion forces - dry milling Theoretical limit of a ball mill
00:37:22 Settling rates
00:38:51 Bridging will always occur - in the dry state!
00:39:08 Producing a stable dispersion
00:41:12 Powder
00:42:14 Dissolution
00:43:11 Stress Corrosion Cracking
00:43:56 Tests for “nano”
00:45:16 Summary/Conclusions
00:46:12 Questions?
00:47:51 Untitled
00:51:53 Comparisons
00:53:09 Van der Waals (from Wikipedia)
00:57:13 Contact information
This presentation will discuss some of the difficulties in producing nanomaterials, i.e. materials that have at least one dimension less 100nm