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Nanotechnology Particle Size and Charge Measurement Solutions
Microtrac has enhanced the Nanotrac instrument line to include Zeta Potential measurement. 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
Zeta Potential is a measure of the charge residing on the surface or near surface of a suspended particle. Zetatrac determines Zeta Potential by measuring the response of charged particles to an electric field. In a constant electric field particles drift at a constant velocity. Through the velocity, the charge and Zeta Potential are determined. Zetatrac utilizes a high frequency AC electric field to oscillate the charged particles. The Brownian motion power spectrum is analyzed with the Nanotrac controlled reference technique of particle sizing to determine the Modulated Power Spectrum, a component of the power spectrum resulting from the oscillating particles. Zeta Potential is calculated from the MPS signal. Also determined are the particle mobility (velocity per electric field), particle charge and particle size.
Zetatrac is controlled by Microtrac FLEX Operating Software. Through the use of 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.
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Model |
NPA152— 31A Zetatrac |
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Internal Sample Cell Volume |
0.7 - 3 ml |
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Measurement Range |
Size |
0.8 to 6500 Nanometers |
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Electrophoretic Mobility |
-10 to +10 µ/sec per volt/cm |
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Measurement Angle |
180 Degrees |
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Concentration limits |
Maximum |
40.0% (sample dependent) |
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Minimum |
0.01% |
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Repeatability |
Particle size |
1% for 100nm Polystyrene |
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Zeta Potential |
+/- 4 mV |
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Electrophoretic Mobility |
+/- 0.3 µ/sec per volt/cm |
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Optical Components |
Laser Diode |
780 nm wavelength |
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3 mW nominal Class IIIb |
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Laser and Detector fixed in place |
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No alignment required |
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Power Requirements |
100 to 240VAC, 47 to 63 HZ |
10 Watt Max. |
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Temperature (operating) |
10 to 50 degrees C |
±0.1°C |
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Humidity |
up to 90% non condensing |
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Dimensions |
Width |
16.2 cm (6.4 inches) |
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Depth |
40.6 cm (16 inches) |
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Height |
16.5 cm (6.5 inches) |
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Weight |
5.2kgs (11.5 pounds) |
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Zetatrac brings together both new and existing technologies to provide a unique Zeta Potential measurement capability. Dynamic light scattering concepts and instrumentation are joined with recent developments in the interaction of random Brownian motion with driven electric field motion of particle suspensions. Zetatrac technology:
- Utilizes Dynamic Light Scattering to determine particle motion in an electric field
- Utilizes Interference Referencing to convert scattered light signal to Frequency Power Spectrum representative of particle motion
- Utilizes proven backscatter optical probe technology to provide a concentration range from PPM to %
- Utilizes recently developed Modulated Power Spectrum analysis of combined Brownian Motion and Electric Field Driven Motion to determine Zeta Potential
The optical measurement of Zeta Potential involves extracting information about particle motion in an electric field from light scattered by suspended particles. The current technologies of dynamic light scattering measure the random Brownian motion of suspended particles and relate the distribution of particle velocities or positions to particle size distribution. Extending this analysis to particles in an electric field provides the means of determining Zeta Potential.
- The Zetatrac instrument is built upon Microtrac’s robust and time tested dynamic light scattering technology.
- The measurement probe contains optical elements which are fixed and frozen - no adjustments necessary.
- The small footprint package is configured for ease of use with a built in Teflon sample cell which provides for either load & run or flow through modes of operation.
- Operating at high frequency Zetatrac measures the interaction between field motion and Brownian motion while avoiding fluid flow artifacts to particle motion, electrochemical degradation of surfaces and measurement errors due to electrode polarization.
Zetatrac provides simultaneous Zeta Potential & Particle Size measurement over the widest possible concentration range.
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Zetatrac Brochure
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