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Nanoparticles
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Zeta Potential
Zeta Potential Measurement
When particles are in suspension, they usually have a surface charge due to the chemistry at the particle surface. Counter ions will be attracted to the charged surface, enveloping the particle in a cloud of counter ions. These counter ions will be most strongly associated with the particle close to the particle surface, in such a way, that a relatively immobile layer of counter ions accumulates close to the particle surface, this layer being called the stern layer. Outside of the stern layer the concentration of counter ions will decrease proportionately with distance from the particle surface, and due to the higher mobility of ions within this region it is often termed the diffuse layer. The zeta potential can be described as the electrostatic potential which is present between the stern layer and diffuse layer (this is sometimes referred to as the slipping plane or boundary).
Measurement of zeta potential is a powerful tool in understanding the stability of a particulate suspension. If zeta potential is low, it indicates that the particles have a weak surface charge, and that repulsive forces between particles in that suspension will be weak. Particles with a low zeta potential will therefore be prone to aggregation and the suspension will not be stable. By contrast if the surface charge is high, there will be strong repulsive forces between particles and the suspension will be less susceptible to aggregation, and therefore more stable.
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Zeta Potential Research Papers
Review recent papers citing use of Quantachrome and Dispersion Technology zeta potential instruments:
TITLE: Preparation and Evaluation of Zidovudine Nanoparticles
AUTHORS: Malleswari, Vijaya Ratna, Desi Reddy, Devi Alekya - Nalanda institute of Pharmaceutical sciences, India
INSTRUMENT: Dispersion Technology DT-300
USAGE: Zeta potential of the best formulation (F4) was determined
View paper
TITLE: Volatile release and structural stability of β-lactoglobulin primary and multilayer emulsions under simulated oral conditions
AUTHORS: Benjamin, Silcock, Beauchamp, Buettner and Everett - Riddet Institute, New Zealand
INSTRUMENT: Dispersion Technology DT-310
USAGE: The effect of saliva on the ζ-potential was measured using an electroacoustic zeta potential probe
View paper
TITLE: Acid–Base Site Detection and Mapping on Solid Surfaces by Kelvin Force Microscopy (KFM)
AUTHORS: Gouveia, Bernardes, Ducati and Galembeck - University of Campinas—UNICAMP, Brazil
INSTRUMENT: Dispersion Technology DT-1200
USAGE: average particle size in aqueous dispersion and
zeta potential both measured at pH 7.8 by acoustic and electroacoustic techniques respectively
View paper
TITLE: Grinding kinetics of nano-sized particles for different electrostatic stabilizing acids in a stirred media mill
AUTHORS: Schilde, Breitung-Faes, Kampen, Kwade - TU Braunschweig, Germany
INSTRUMENT: Dispersion Technology DT-1200
USAGE: the primary particle size and zeta potential via ultrasonic spectroscopy
View paper
TITLE: Controlling protein–particle adsorption by surface tailoring colloidal alumina particles with sulfonate groups
AUTHORS: Meder, Brandes, Treccani, Rezwan - University of Bremen, Germany
INSTRUMENT: Dispersion Technology DT-1200
USAGE: Zeta potential measurements of the particles and particle-protein complexes were carried out using an electroacoustic spectrometer
View paper
TITLE: Magnetic composites based on metallic nickel and molybdenum carbide: A potential material for pollutants removal
AUTHORS: Mambrini, Fonseca, Dias, Oliveira et al - Universidade Federal de Minas Gerais, Brazil
INSTRUMENT: Dispersion Technology DT-1200
USAGE: Zeta potential at different pH's were measurement
View paper
TITLE: Effects of calcination and milling on surface properties, rheological behaviour and microstructure of 8 mol% yttria-stabilised zirconia (8 YSZ)
AUTHORS: Hanifi, Zazulak, Etsell, Sarkar - University of Alberta, Canada
INSTRUMENT: Dispersion Technology DT-1200
USAGE: Zeta potential (ZP) measurement was carried out on 5 wt% suspensions
View paper
TITLE: Effect of the Molecular Weight on the Physicochemical Properties of Poly(lactic acid) Nanoparticles and on the Amount of Ovalbumin Adsorption
AUTHORS: Palacio, Orozco and López - Universidad de Antioquia, Colombia
INSTRUMENT: Dispersion Technology DT-300
USAGE: The zeta-potential of the PLA nanoparticle dispersions was measured using the electroacoustic colloidal vibration current (CVI) technique
View paper
TITLE: Wet ultrafine grinding of ethyl cellulose by agitator bead mill
AUTHORS: Schindhelm, Montes Herrera, Teipel - Georg Simon Ohm University of Applied Sciences, Germany
INSTRUMENT: Dispersion Technology DT-1200
USAGE: zeta-potential measurements were carried out
View paper
TITLE: In situ recording of particle network formation in liquids by ion conductivity measurements
AUTHORS: Pfaffenhuber, Sörgel, Weichert, Bele, Mundinger, Göbel and Maier - Max Planck Institute for Solid State Research, Germany
INSTRUMENT: Dispersion Technology DT-1201
USAGE: Zeta potential measurements were performed according to the electroacoustic technique
View paper
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