| 00:00:00 | Welcome |
| 00:00:11 | Introduction |
| 00:00:41 | A basic introduction to Electrophoretic Light Scattering (ELS) for Zeta potential measurements |
| 00:00:46 | Objectives |
| 00:01:35 | Dispersion Stability |
| 00:08:28 | DLVO Theory, 1940’s |
| 00:11:24 | MAINTAINING COLLOIDAL STABILITY |
| 00:11:48 | Maintaining Dispersion Stability |
| 00:13:42 | ELECTROSTATICS:Origins of Surface Charge in Aqueous Media |
| 00:13:55 | Untitled |
| 00:18:29 | ZETA POTENTIAL |
| 00:21:20 | Factors Affecting Zeta Potential |
| 00:21:40 | Predicting Dispersion Stability |
| 00:22:22 | 1.) Zeta Potential and pH |
| 00:24:41 | 2.) Salt Ion - Conductivity |
| 00:25:46 | Non Specific Ion Adsorption |
| 00:27:03 | Specific Ion Adsorption |
| 00:27:54 | 3.) Concentration of Surface Active Molecules |
| 00:30:52 | Electrokinetic Phenomena |
| 00:30:57 | ElectrokineticS |
| 00:31:17 | Electrokinetic Phenomena |
| 00:31:47 | Electrokinetic Phenomena |
| 00:34:31 | Untitled |
| 00:34:41 | Electrophoresis |
| 00:35:08 | Electrophoretic Light Scattering |
| 00:35:49 | Electrophoresis |
| 00:36:14 | Henry’s Function F(ka) |
| 00:36:19 | Henry’s Function F(ka) |
| 00:36:39 | Calculation of the Debye Length |
| 00:36:55 | Calculation of the Debye Length |
| 00:37:36 | Double Layer Thickness |
| 00:38:14 | Untitled |
| 00:38:22 | Optical Configuration of the Nano |
| 00:39:46 | Mixed Mode Measurement (M3) |
| 00:40:57 | Mixed Mode Measurement Phase Analysis Light Scattering (M3-PALS) |
| 00:42:04 | Voltage & Current Plot |
| 00:43:04 | FFR & SFR Phase Plot General Purpose Result |
| 00:44:50 | Conclusions |
| 00:46:36 | Thank you for attendingAsk your questions nowor email us at:ask@Malvernpanalytical.com |
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.
Vortragende
- Dr Ana Morfesis
Ana is Applications Specialist for our Nanometrics product group. She joined Malvern Panalytical in 1999 and works with us in conjunction with the Carnegie Mellon University Lab. Ana has a PhD in Physical Chemistry from the University of Massachusetts. Her area of research has been colloid and surface chemistry since the early 1980s.
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Who should attend?
Anyone who is working with or interested in Electrophoretic Light scattering or Zeta potential and would like an overview of the technique and its applications.
What will you learn?
How electrophoresis is measured and zeta potential calculated. What is the double layer, surface charge and interfacial characteristics as well as isoelectric point characterization.
Why attend?
This is an opportunity to get a basic overview of Electrophoretic Light Scattering and Zeta Potential, including key applications, from one of Malvern Panalytical's Zetasizer experts.