Date recorded: February 16 2017

Duration: 01 hours 05 minutes 49 seconds

Understanding the basic principles of any analytical technique is vital in providing the fundamental building blocks on which to expand one’s knowledge. Within particle size analysis one short document has proven very popular over the years - “The Basic Principles of Particle Size Analysis". This has been Malvern Instruments' most popular document in both digital and paper formats. It was first written in 1993 (based on an earlier conference submission) and has been revised on a couple of occasions.

This webinar will be based on that Basics document and will be presented by the author of that document – Dr Alan Rawle. In line with that document the webinar will introduce you to the basics of particle sizing including:
• Terminology
• International standards
• Math – what the important numbers on the analysis report mean
• Outline of the main techniques (sieves, sedimentation, electrical sensing zone)
• Other techniques (SAXS, NTA, RMM)
• Overview of light scattering techniques - in particular, Dynamic light scattering (DLS) and Laser diffraction
Table of contents
1. Welcome
00:11
2. Introduction
01:37
3. The Basic Principles of Particle Size Analysis
00:21
4. Abstract
00:26
5. Earliest history
00:05
6. The history – later editions. Note the number of views…And the outdated picture….
00:33
7. Printed form
01:16
8. The PRA conference in January1994 - 1
00:29
9. So the coatings application note actually came first….
00:48
10. It’s popular!
00:26
11. Languages….
00:26
12. Overview
01:24
13. Average American college student
00:47
14. Harold Heywood (1905 – 1971)
01:02
15. Brian Scarlett
00:52
16. Basic principles
01:55
17. Basic principles
00:41
18. Basic principles
01:00
19. Basic principlesEquivalent sphere - volume/mass
00:50
20. Basic principlesEquivalent sphere - surface area
00:55
21. Basic principles
00:38
22. Basic principles
01:05
23. Basic principles
00:56
24. Number - Length mean
01:18
25. Number - Surface Area mean
01:18
26. Number - Volume/Mass mean
01:13
27. Difficulties with the number means
01:32
28. (Wait a)….Moment Means
01:07
29. Surface Area Moment MeanD[3, 2]
01:06
30. Volume/Mass Moment MeanD[4, 3]
01:32
31. Volume Moment Mean
00:45
32. Volume Moment Mean - D[4, 3]
00:30
33. Practical Example
00:59
34. Practical Example
01:08
35. Practical Example
00:47
36. Basic principles – mean summary
01:24
37. Conversion between means and distributions
00:55
38. Basic principles
00:53
39. Number and volume- objects in space
01:49
40. Particle Counting and Particle Size Analysis
00:57
41. Particle Size Analysis
00:20
42. Techniques
00:16
43. Untitled
00:50
44. Sieves
00:33
45. Sieves
01:31
46. Sieves
00:08
47. Sieves
00:44
48. Sieving
00:43
49. Microscopy/Image analysis
02:05
50. Microscopy/Image analysis
01:07
51. Microscopy/Image analysis
01:09
52. Electrical Sensing Zone - (Coulter Counter)
00:54
53. Untitled
00:05
54. Electrical Sensing Zone - (Coulter Counter)
00:49
55. Electrical Sensing Zone - (Coulter Counter)
00:39
56. Gas adsorption techniques (BET)
01:51
57. Small-angle X-ray scattering (SAXS)
01:02
58. Nanoparticle Tracking Analysis (NTA)
00:25
59. Resonant Mass Measurement – ArchimedesSee: https://www.youtube.com/watch?v=w26l31Fv_4Y
00:46
60. Light scattering
00:30
61. Why laser diffraction?
00:38
62. Measurement principle
00:44
63. Untitled
00:25
64. Halo around moon http://apod.nasa.gov/apod/ap030421.html
00:08
65. Size of droplets
00:24
66. Variation of scattering angle with particle size
00:33
67. So what happens when the size gets small?x < l/10
00:49
68. Just one photon
00:23
69. Slide69
00:00
70. Dynamic Light Scattering
00:21
71. Correlation functions for different particle sizes
00:24
72. Calculating size distributions from the correlation functions
00:27
73. Thank you
00:40
74. Thank you for your attentionAny questions?
04:46
75. Contact Information
00:44
76. AppendixReferences
00:00
77. AppendixReferences
00:00
78. AppendixReferences
00:00
79. AppendixReferences
00:00
80. The ISO terminology for particle size
00:00
81. The ISO terminology for particle size (in progress)
00:00
82. AppendixBasics – Internet material
00:00