ZetaPlus – The simplest, easiest to use Zeta Potential Analyser
The Brookhaven ZetaPlus is designed
for rapid , accurate and, above all, straightforward
determination of zeta
potential and electrophoretic mobility of
fine particles from around 5nm up to about 50µm.
Its principle is the measurement of the Doppler
shifted frequency spectrum of scattered laser
light using a known reference frequency for maximum
accuracy.
The key attraction of the ZetaPlus is its simplicity
of operation due to the innovative design of its
sample cell – electrode assembly. Using low
cost, disposable cuvettes* and simple "plug-in"
electrodes, it completely eliminates the problem
of electroosmosis – for all samples. With
this system, cell alignment with respect to the
laser beam is no longer critical and therefore
requires no periodic checking or adjustment. Bubble-free
filling of the cell is easy and fast and the volume
of sample required is minimal.
Sample temperature is accurately controlled by
a fast response dual-Peltier system operating
in the range 50C to 750C. For most common liquid
media, necessary physical constants are all pre-programmed
throughout the temperature range. pH can be read
directly into the ZetaPlus software. Zeta potentials
can be automatically plotted against pH or any
other variable of the user’s choice, such
as surfactant or additive concentration.
For submicron particle size distribution analysis,
all the features of the Brookhaven 90Plus
can be added at any time. Availability of two
scattering angles, 900 or 150,
enables both size and zeta potential measurements
to be made in the same cell without changing the
sample.
The ZetaPlus shows the complete spectrum of zeta
potentials within the sample enabling mixed populations
"bimodals", should they exist, to be
resolved.
* Alternatively glass or quartz cells can be used where
necessary for sample compatibility
Most colloidal particles (solid, liquid
or gas) suspended in water or polar solvents.
Particle Size Range:
Material dependent. For electrophoresis,
typically 0.005 to 30µm; for particle
sizing, 0.002 to 3 microns overall.
Volume:
1 mL to 1.5 mL, optional 0.2 mL for particle
sizing only.
pH Range:
2 to 12.
Conductivity Range:
0 to 700 s/m.
Mobility Range:
10-9 to 10-7 m2/V.s
Temperature Range:
50C to 750C +/- 0.20C.
Measurement Duration:
Typically 10 - 40 seconds/run.
Laser: 30 mW:
30 mW; 50 mW option available.
Field Strength:
0 to 3.2 kV/m, automatically or by user
selection.
Electrodes:
Palladium with acrylic supports; for reactive
samples gold electrodes with Kevlar supports
are available.
Cells:
Disposable plastic, or glass or quartz.
Computer:
Built-in PC. WindowsTM Software included.
Check with Brookhaven for latest specifications.
External computer optional.
Printer:
Colour inkjet, standard. Others available.
Monitor:
Colour, SVGA graphics card.
Input Power:
100/115/220/240 VAC; 50/60 Hz; 300 Watts.
Dimensions:
267(H) x 635(W) x 445(D) mm. (excluding
monitor)
Weight:
37Kg. (excluding monitor)
Options:
Particle size distribution analysis by dynamic
light scattering (see 90Plus);
Phase Analysis Light Scattering for zeta potential
determination all types of colloidal samples
but particularly for non-aqueous or viscous
media and other low mobility situations (see
ZetaPALS).
