| 00:00:00 | Dispersion and Nanotechnology |
| 00:02:44 | Dispersion and nanotechnology |
| 00:02:46 | Can I say anything new? |
| 00:03:46 | Abstract |
| 00:04:22 | 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 |
| 00:05:20 | The 3 S’s |
| 00:06:46 | Bulk/Primary: solid bridging; room temperature sintering |
| 00:07:34 | Solid-solid diffusion |
| 00:08:49 | Gas Phase Particle Growth |
| 00:10:04 | Untitled |
| 00:10:39 | Inertial and van der Waals forces….. |
| 00:11:48 | Bridging will always occur - in the dry state! |
| 00:12:30 | Attractive (van der Waals) and inertial forces |
| 00:13:09 | Attractive (van der Waals) and inertial forces |
| 00:13:36 | Attractive (van der Waals) and inertial forces |
| 00:14:53 | Surface and size |
| 00:15:51 | Gas adsorption techniques (e.g. BET) |
| 00:16:41 | Gas adsorption techniques (e.g. BET) |
| 00:17:03 | Using the BET model to measure surface area |
| 00:17:32 | Comparison with laser diffraction |
| 00:18:24 | Gas adsorption techniques (BET) |
| 00:19:25 | Gas adsorption techniques (BET) |
| 00:19:35 | Gas adsorption techniques (BET) |
| 00:20:31 | Qualitative Measure of Dispersion Efficiency |
| 00:21:45 | Surface – the 3 C’s |
| 00:23:15 | Surface sensitive techniques |
| 00:24:45 | Inverse GC DPI |
| 00:25:41 | Differential Polarization Interferometry See: http://www.farfield-scientific.com/pdfs/doubling.pdf And plenty of Webinars… |
| 00:26:20 | Differential Polarization Interferometry |
| 00:27:04 | Surface Composition/chemistry |
| 00:29:27 | TiO2 pigment |
| 00:30:44 | TiO2 coatings |
| 00:31:50 | The scale of the issue |
| 00:33:33 | TiO2 – pictures and plots... Confusing…. |
| 00:34:10 | So is this reasonable, for example? |
| 00:34:49 | Composition |
| 00:36:19 | 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 |
| 00:36:44 | Nanoclusters See: http://sces.phys.utk.edu/~dagotto/condensed/Magnetic%20Nanoclusters.pdf |
| 00:37:24 | Chemisorption induced segregation |
| 00:37:51 | Chemisorption induced segregation |
| 00:38:18 | Alloys – surface properties |
| 00:39:22 | Pd-Au and Pd-Ag alloys |
| 00:40:42 | Charge |
| 00:41:40 | Zeta potential |
| 00:41:59 | Producing a stable dispersion |
| 00:43:31 | Titanium dioxide D50 = 0.25 mm approx. Calgon additive |
| 00:44:07 | CeO2 |
| 00:44:28 | Indications that there is a stability issue Removal of ultrasound in DI water - BDAS |
| 00:45:22 | Stability studies with Zeta3000HS plus titrator |
| 00:46:47 | Stability studies with Zeta3000HS plus titrator |
| 00:47:33 | Measurement with optimum conditions Before, during and after ultrasound |
| 00:48:02 | 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 |
| 00:48:35 | Comparison between properly dispersed and poorly dispersed material |
| 00:48:53 | Corona |
| 00:49:39 | Skip Rung, President and Executive Director, ONAMI – Blog - referring to recent ILS’s in nano |
| 00:50:25 | Powders are also a problem! Kendall |
| 00:51:13 | Powder |
| 00:52:30 | Adhesion forces - dry milling Theoretical limit of a ball mill |
| 00:53:08 | Nanopowder….. |
| 00:53:38 | Dissolution |
| 00:54:37 | Stress Corrosion Cracking |
| 00:55:24 | Tests for “nano” |
| 00:57:42 | 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 |
| 00:58:54 | Settling rates - comment |
| 00:59:45 | Drexler |
| 01:00:15 | K. Eric Drexler |
| 01:00:31 | Ladybug - 35mg Elephant – cow – not bull – 3500kg |
| 01:01:11 | Heywood – we expect a quote! (Lunar dust) |
| 01:02:26 | Thank you |
| 01:05:56 | Contact Information |
'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