ZetaPALS0 pages

ZetaPLS Zeta Potential & Particle Size Analyzer For Measurements In: ■ Solvents ■ High Sait ■ Oily or viscous media ■ Near the isoelectric point ■ 1,000x more sensitive than other techniques ZetaPALS: A Whole New Concept Carrying On the Tradition, A Unique Cell Design For measurements of low mobility, the unique, Brookhaven Instruments ZetaPALS is the answer. There is nothing else like it. With concepts developed at Bristol University and Brookhaven Instruments, the ZetaPALS deter­mines zeta potential using Phase Analysis Light Scattering (PALS): a technique that is up to 1,000 times more sensitive than traditional elec-trophoretic light scattering. Electrostatic repulsion of colloidal parti-cles is often the key to understanding the stabil-ity of any dispersion. A simple, easy measure-ment of the electrostatic mobility - even in non-polar liquids-yields valuable information. Measurements in water and other polar liquids is easy and fast with the Brookhaven Instruments ZetaPlus. Such measurements cover the range of typically 9 - 100 mV, corresponding to a range of mobilities of 0.5 - 8 x 10-8 m2/V ͕ s. Measurements in low dielectric liquids, or in high viscosity oils, or in high salt concentrations, or even very near the I.E.P. involve mobili-ties 10, 100, and even 1,000 times smaller. Tra-ditional approaches simply fail under these cir-cumstances or suffer from poor repeatability. With the ZetaPALS such measurements are made in typically 30 - 50 seconds, and the re-peatability is typically 1 - 2%. The same unique cell design that made the Brookhaven Instruments ZetaPlus the stanͭdard instrument for use in polar liquids is also used in the ZetaPALS. A design that eliminates electroosmosis, eliminates the need to find sta-tionary planes, allows the user to ignore calibra-tion or alignment: there simply isn't any. The standard ZetaPALS cell is made of quartz or glass with Kevlar support Au electrodes. When used with water or other simple, nonaggressive liquids, the cell can be switched to the inexpensive, disposable plastic cells with Pd electrodes, the same type used in the Zeta-Plus. The precision Peltier temperature control allows measurements from 10 °C to 70 °C. Particle Sizing Option An optional feature of the ZetaPALS is the measurement of particle size by dynamic light scattering. Based on the well established technique used in the Brookhaven Instruments 90Plus, particle size and distribution information are obtained in minutes. Particle size measurements and zeta potential determination are made in the same cell. There is even a choice of two scattering angles, 15° or 90°, for particle sizing.