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When colloidal particles are dispersed in a solution they become electrically charged due to their ionic and dipolar characteristics. Zeta potential is a measure of particles attraction or repulsion. If the particles acquire a large positive or negatve zeta potential, they repel each other and form a stable suspension. Solutions are generally considered stable if they have a zeta potential of more than +30mV or less then -30mV. It should also be noted that zeta potential is highly dependent on pH. The point at which zeta potential reads 0mV is called the isoelectric point. Zeta potential is important in industries such as ceramics, minerals processing, water treatment, pharmaceuticals etc.
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The Nicomp 3000, a nanoparticle size analyzer from Particle Sizing Systems, is based on Dynamic Light Scattering or DLS technique. Dynamic Light Scattering is suitable for sizing proteins, nanoparticles, colloids, CMPs, inkjet inks, emulsions and other dispersions used in medicine and nanotechnology.
The Zetasizer Helix provides structural information at the molecular level by which it is possible to obtain understanding about the formation of oligomers and also aggregation and unfolding processes of biopharmaceuticals.
Malvern Instruments has designed a premium particle characterization system called Zetasizer Nano ZSP.
The Canty SolidSizer TS unit is a versatile tool for lab environments to determine particle size and shape, thereby eliminating the need for sieving. The system also has multiple configurations that allow color analysis and defect detection, as well as a tilting stage for flat particle analysis.
Malvern's Zetasizer AT integrates the proven dynamic light scattering (DLS) technology of the Zetasizer Nano, bringing a new level of dimension to the process development and manufacturing field, allowing on-line measurement of nanoscale particle processes in real time.
Malvern Instruments offers the Zetasizer Nano Z system, which is exclusively designed for measuring electrophoretic mobility and zeta potential of nanoparticles and colloids through Laser Doppler Micro-Electrophoresis.
Malvern Instruments offers a low-cost zeta potential analyzer called Zetasizer Nano ZS90.
The Malvern NanoSight NS500 instrument offers a convenient, reproducible platform for nanoparticle characterization.
The Zetasizer WT from Malvern is a fully automated on-line zeta potential measurement system providing lab quality results. It offers real-time monitoring of efficient charge neutralization and flocculation process performance.
The Zetasizer Nano ZS is a high performance, two angle particle and molecular size analyzer for the improves detection of aggregates and measurement of small or dilute samples, and samples at very low or high concentration using dynamic light scattering with ‘NIBS’ optics.