Brookhaven Instruments ZetaPALS



For measurements of very low mobilities, the Brookhaven ZetaPALS is the answer. The only answer! With concepts developed at Bristol University and Brookhaven Instruments, the ZetaPALS determines zeta potential using Phase Analysis Light Scattering: A technique that is up to 1,000 times more sensitive than traditional light scattering methods based on the shifted frequency spectrum.

Electrostatic repulsion of colloidal particles is often the key to understanding the stability of any dispersion. A simple, easy measurement of the electrophoretic mobility "even in nonpolar liquids" yields valuable information. Measurements made in water and other polar liquids are easy and fast with the Brookhaven ZetaPlus. Such measurements cover the range of typically ±6 - 100 mV, corresponding to mobilities of ± 0.5-8x10-8 m2 /V·s. The ZetaPALS covers this full range, of course, and extends it by a factor of 1000 in sensitivity!
Principles of Operation

The ZetaPALS utilizes phase analysis light scattering to determine the electrophoretic mobility of charged, colloidal suspensions. Unlike its cousin, Laser Doppler Velocimetry (LDV) (sometimes called Laser Doppler Electrophoresis (LDE)), the PALS technique does not require the application of large fields which may result in thermal problems. Because in the measurement of phase shift, the particles need only to move a fraction of their own diameter to yield good results. In salt concentrations up to 3 molar and with electric fields as small as 1 or 2 V/cm enough movement is induced to get excellent results. In addition, the Autotracking feature compensates for thermal drift.
Depth 445 mm
Height 267 mm
Width 635 mm
Weight 37 kg
Additional Specifications Type: Most colloidal samples suspended in water or polar solvents.
Size Range: Material dependent, For electrophoresis 0.005 to 30 microns; For particle sizing <0.0006 to 6 microns.
Volume: 1 mL to 1.5 mL, optional 10 µL for particle sizing only.
pH Range: 1 to 13.
Conductivity Range: 0 to 20 mS/m.
Mobility Range: 10-11 to 10-7 m2 /V.s
Temperature Control: 6 °C to 100 °C, ±0.1 °C, active control. No external circulator required.
Measurement Duration: 10 to 250 s, typically 30s.
Laser: nominal 35 mW (raw laser power), 50 mW available option.
Field Strength: 0 to 60 kV/m, either automatic or by manual selection.
Electrodes: Palladium with acrylic supports; for reactive samples. Palladium electrodes with solvent resistant supports are available.
Cells: Disposable plastic; glass.
Input Power: 100/115/220/240 VAC; 50/60 Hz; 300 Watts.
Certifications: CE Marked
Dimensions: 267(H) x 635(W) x 445(D) mm. (excluding monitor and printer)
Weight: 37kg. (excluding monitor and printer)


Features Include
  • Zeta potential for the difficult cases...
    - In organic solvents
    - In oily or viscous media
    - In high-salt suspensions
    - Near the I.E.P.
  • 1000 times more sensitive than other techniques
  • Disposable cuvettes, no contamination or alignment
  • Built in automatic procedures and parameters
  • Easy to use. Complete w/computer & printer
  • Upgradable to include full particle sizing functionality

Typical Applications
  • Liposomes and biocolloids
  • Ceramics and refractories
  • Pigments and inks
  • Pharmaceuticals
  • Emulsions (foodstuffs, cosmetics)
  • Wastewater treatment monitoring
  • Latexes
  • Carbon blacks




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retrieved files are different from those originally saved

Hi, today I retrieved a file from my Brookhaven ZetaPALS. Turned out that retrieved data (effective diameter, polydispersity, even the single runs) are different from those originally printed out just after the measurement (ca. 1 year ago). I am...

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