Introduction to Zeta Potential: Dispersion, Aggregation, and Stability Evaluation of Nanoparticles
S30901
Methods to enhance the stability of nanoparticle dispersion systems.
★ A thorough explanation from the basics about the Hamaker constant, zeta potential, DLVO theory, and how to draw potential curves! ☆ Methods to enhance the stability of nanoparticle dispersion systems! ★ Improve your understanding of zeta potential, which relates to all interfacial electric phenomena including electrophoresis, electroosmosis, and streaming potential! 【Instructor】 Hiroyuki Oshima, Honorary Professor, Faculty of Pharmacy, Tokyo University of Science 【Venue】 Kawasaki City Industrial Promotion Hall, 10th Floor, Conference Room 1 [Kanagawa, Kawasaki] 【Date and Time】 September 24, 2013 (Tuesday) 11:00 AM - 4:00 PM
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basic information
**Keywords** 1. Dispersion and aggregation of nanoparticles 2. Zeta potential 3. Hamaker constant **Lecture Summary** The stability of nanoparticle dispersion systems is determined by the balance of two factors: the Hamaker constant, which is a factor promoting aggregation, and the zeta potential, which is a factor promoting dispersion. By understanding these two factors, it is possible to plot the potential curve of nanoparticle interactions based on DLVO theory. When there is a high barrier on this curve, the dispersion system is stable. This seminar aims to achieve a thorough understanding of these two factors, DLVO theory, and how to plot the potential curve from the basics.
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For applications until September 10th, the fee is 47,250 yen for 2 people from 1 company.
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P2
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P2
Applications/Examples of results
**Program** 1. Why do nanoparticle dispersion systems aggregate? 1-1. Intermolecular forces and nanoparticle forces are the same 1-2. Factors promoting nanoparticle aggregation - Hamaker constant 2. Diffuse electric double layer around nanoparticles 2-1. Thickness of the electric double layer 2-2. Charge and potential of nanoparticles 3. Electrophoresis of nanoparticles and zeta potential 3-1. Factors promoting nanoparticle dispersion - zeta potential 3-2. Smoluchowski equation and Hückel equation 3-3. Henry's equation 3-4. Equation considering relaxation effects 4. Electrophoresis of soft particles 4-1. Differences from solid particles 4-2. Polymer electrolytes 4-3. Charge density and softness parameters 5. Stability evaluation of nanoparticle dispersion systems - DLVO theory 5-1. Electrostatic repulsion between nanoparticles 5-2. How to draw potential curves 5-3. DLVO theory and Schulze-Hardy empirical rule 5-4. Potential barrier (energy barrier) and aggregation probability 5-5. Methods to enhance the stability of nanoparticle dispersion systems **Q&A**
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