Delsa 440 SX
Zeta Potential and Particle SizeMethod Electrophoretic mobility measurement by
Laser Doppler VelocimetrySize Range 0 - 10 m . cm/V.sec. (Mobility)
10 nm - 30 µm (particle size)
Patented simultaneous multi-angle analysisTypical Applications Latex, Liposomes, Micro emulsions,
Pigments, Polymers, Proteins,
Bacteria and Biological cells
The DELSA 440 SX analyzes data from 4 scattering angles. The simultaneous multi-angle analysis simplifies data interpretation. It also distinguishes between particle charge heterogeneity and diffusion effects over a wide range of particle sizes. The instrument is automated and provides a simple analysis which can detect small charges. It also measures particle size distribution.
Zeta Potential Is Key To Product Performance.
Whether you need proper pigment dispersion in your paint, or want to monitor interactive behavior and binding reactions between cells, zeta potential is the critical factor. The DELSA 440SX combines zeta potential and particle size distribution analysis in one instrument, making it ideal for characterizing colloidal systems and processes.
Coulter's DELSA 440SX Utilizes Simultaneous Multiple Angle Analysis.
- The COULTER DELSA 440SX utilizes laser light, four photodiodes four 256-channel autocorrelators to discriminate between particles from four optimized angles and detect very small mobility or zeta potential differences. The result is increased accuracy which cannot be achieved by repeating single-angle analyses.
- Only the DELSA 440SX discriminates between particle charge heterogeneity and diffusion effects.
- The instrument is sensitive over a wide range of particle sizes, from 10nm to greater than 30um.
- The DELSA 440SX's automated, sixty-second analysis eliminates operator bias and fatigue.
- Specific conductance of the suspension is measured and reported with controlled measurement temperature over a wide range (ambient to 60 degrees C).
- The DELSA 440SX distinguishes between electrophoretic heterogeneity and diffusion heterogeneity.
- Windows®-based software allows simultaneous data collection and analysis, display of several runs at once, and mobility curve overlays.
Consider These Exclusive Benefits.
Data validation by two methods: comparison angles and linear shift of frequency as a function of angle.
Accurately analyzes dynamic colloidal systems by measuring mobility at four light scattering angles simultaneously in a single, one-minute run.
Superimposes different spectra.
Detects small charge differences as low as .01 um-cm/volt-sec.
Allows rapid and convenient data review by overlaying up to four saved runs in one display window.
Graph Zoom enlarges any selected region to full window size.
Reports result in concise, easily understood formats.
The Simple Solution: Coulter.
- Reports electrophoretic mobility, zeta potential, conductivity, and particle size distribution.
- Eliminates hours from manual microscopic methods.
- Provides easy-to-read results.
- Uses only 0.8mL of sample.
- Uses state-of-the-art Laser Doppler technology.
- Provides charge and size information on individual mobility peaks.
- Training time is minimal.
- Offers more graphics choices for report preparation.
- Eliminates false results from light scattering artifacts.
- Eliminates vibrations and line noise that confuse data interpretation.
- Eliminates user bias.
- Measures a large population of particles to assure sampling accuracy.
- Provides accurate determination of mobilities for small particles.
- Measures size difference between particles of different mobilities.
- Detects small particles in a heterogeneously sized sample.
- Allows sample recovery.
COULTER DELSA 440SX
Technical SpecificationsMeasurement Range:
.003 µm to 3µm diameterCurrent Range:
0 to 30 mAElectrophoretic Mobility
0 to 10 µm-cm/volt-secVoltage Range:
0-300VFrequency Measurement
Range:
0-50, 0-100, 0-125, 0-250,
0-500, and 0-1000 HzMeasured Conductivity:
2µS/cm to 200 milliSiemen/cmMobility Resolution:
256-channel resolution per
detectorTemperature Range:
25-55°C controlled to ±0.3°C at ambient (25°C)Electric Field Strength:
0-500 V/cmLight Source:
5mW helium-neon laser;
wave length of 632nmField Timing:
0-500 s (on/off); selectable on
0.1 incrementsDetection Optics:
4 angles simultaneously
(7.5°, 15.0°, 22.5°,30.0°)Controls, Standards and Accessories
© Coulter International Corporation, 1996. All rights reserved. Copyrights and Trademarks
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