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ZETA POTENTIAL AND SIZE DISTRIBUTIONS

Microtrac has enhanced the functionality of the Nanotrac range of instruments to include Zeta Potential measurement capability. The determination of Zeta Potential provides critical information to researchers and production personnel regarding the stability of a wide range of emulsions and colloidal suspensions.

Zetatrac utilizes the unique Nanotrac probe technology to provide fast, accurate, convenient and cost effective Zeta Potential measurements without the need for disposable cuvettes.

One instrument—Three Measurements:

Zeta Potential
Particle Size
Molecular Weight

Zetatrac measures Zeta Potential by determining the mobility of particles as they move from one side of the sample cell to the other. A potential difference is applied to the sample cell and charged particles move to the electrode of opposite polarity at a velocity proportional to their charge. Using the principles of Dynamic Light Scattering, light from a laser is scattered and is frequency shifted under the Doppler Effect in relation to it’s velocity. By determining the velocity of the charged particle, the Zeta Potential can be calculated. Zetatrac uses Microtrac’s proprietary Controlled Reference Method to generate a power spectrum (inverse of photon correlation curve) of the moving charged particles. Unlike other methods, Zetatrac can measure Zeta Potential in both high and low concentration suspensions.

Zetatrac is controlled by Microtrac FLEX Operating Software. Through the use off Standard Operating Procedures (SOP’s), the user is guided through a series of easy steps to generate full characterization data on Zeta Potential and Particle Size. Data archiving and retrieval is through standard Microsoft Access™ database management with the ability to export data either manually or automatically. Graphic data presentations, report generation, trending and statistical analysis are all standard features of FLEX Software.

SPECIFICATIONS

Model	NPA151 - 31A Zetatrac
Internal Sample Cell Volumes	0.2 ml
Measurement Range	Size Zeta Potential	0.8 to 6500 nanometers 3 nm to 10 microns
Measurement Angle	180 Degrees
Concentration Limits	High Low	up to 40% by solids in some cases 0.1 mg/ml Lysozyme
Repeatability	Particle Size Zeta Potential	1% for 100 nm Polystyrene +/- 5mV, +/- 0.4 mobility units, (microsecond/vol
Optical Components	Laser Diode	780 nm wavelength, 3 mW nominal, Class IIIB Laser and detector fixed in place - no alignment required
Power requirements	90 to 240 VAC, 47 to 63 Hz, 5 Amps
Temperature (operating)	10 to 50 Degrees C
Humidity	up to 90% non condensing
Dimensions	Width Depth Height	10.2 cms (4 inches) 38.1 cms (15 inches) 15.2 cms (6 inches)
Weight	3.2 kgs (7 pounds)

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