記録された日時: March 18 2010

Duration: 23 minutes 58 seconds

In this presentation, we indicate a simple means of eliminating one incorrect judged optical property for a metal oxide. This route is to change the optical properties of the material from translucent with unknown imaginary component to opaque.
Table of contents
1. Particle size distribution by laser diffraction - in situ change of optical properties of the material without change in the size distribution
00:51
2. Pittcon 2010
00:30
3. Abstract
00:27
4. Overview
00:22
5. Experimental Equipment and materials
01:14
6. The trail of fines – is it real?
02:02
7. The trail of fines – is it real? Not visible under the microscope… 5% by mass would be 100% by number
01:44
8. So it’s not real. Then how does it arise?
03:26
9. The Fraunhofer approximation only considers the light scattered at the contour of the particle
02:10
10. So, let’s make the particle opaque….
01:26
11. Dyed silica gel with Fraunhofer approximation These particles are not disappearing – they’re simply not there originally!
01:00
12. What’s happening to the raw scattering?
00:56
13. More drops…
00:41
14. At this stage the dye adsorption is slow
00:39
15. We can wait…
00:39
16. Dye alone
00:35
17. Size of methylene blue?
00:40
18. And we can add SiO2 gel to mop this up! Note – no false trail of fines here…
00:49
19. Mie theory?
01:26
20. Summary
02:21