Date recorded: February 08 2018

Duration: 53 minutes 11 seconds

Electrophoretic Light Scattering (ELS) is a technique used to measure the electrophoretic mobility of particles or molecules in solution. This measurement is used to determine Zeta potential, which is a measure of the electrostatic or charge repulsion/attraction between particles, and is a predictor of emulsion and dispersion stability. Zeta potential is a function of both the particle surface and the dispersant. It provides information that is critical to formulators during the design of multicomponent products.

In this presentation Dr Ana Morfesis will discuss the importance of Zeta potential measurements for colloidal dispersions and how it is determined using ELS.

Table of contents
1. Welcome
00:11
2. Introduction
00:30
3. A basic introduction to Electrophoretic Light Scattering (ELS) for Zeta potential measurements
00:05
4. Objectives
00:49
5. Dispersion Stability
06:53
6. DLVO Theory, 1940’s
02:56
7. MAINTAINING COLLOIDAL STABILITY
00:24
8. Maintaining Dispersion Stability
01:54
9. ELECTROSTATICS:Origins of Surface Charge in Aqueous Media
00:13
10. Untitled
04:34
11. ZETA POTENTIAL
02:51
12. Factors Affecting Zeta Potential
00:20
13. Predicting Dispersion Stability
00:42
14. 1.) Zeta Potential and pH
02:19
15. 2.) Salt Ion - Conductivity
01:05
16. Non Specific Ion Adsorption
01:17
17. Specific Ion Adsorption
00:51
18. 3.) Concentration of Surface Active Molecules
02:58
19. Electrokinetic Phenomena
00:05
20. ElectrokineticS
00:20
21. Electrokinetic Phenomena
00:30
22. Electrokinetic Phenomena
02:44
23. Untitled
00:10
24. Electrophoresis
00:27
25. Electrophoretic Light Scattering
00:41
26. Electrophoresis
00:25
27. Henry’s Function F(ka)
00:05
28. Henry’s Function F(ka)
00:20
29. Calculation of the Debye Length
00:16
30. Calculation of the Debye Length
00:41
31. Double Layer Thickness
00:38
32. Untitled
00:08
33. Optical Configuration of the Nano
01:24
34. Mixed Mode Measurement (M3)
01:11
35. Mixed Mode Measurement Phase Analysis Light Scattering (M3-PALS)
01:07
36. Voltage & Current Plot
01:00
37. FFR & SFR Phase Plot General Purpose Result
01:46
38. Conclusions
01:46
39. Thank you for attendingAsk your questions nowor email us at:ask@Malvernpanalytical.com
06:35