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Features at a glance

  • Accurate and quantitative
  • Resolves mixtures
  • X-ray detection - no optical corrections
  • Range 10 nm to 100 µm
  • Scanning head for high speed
  • Simple operation
  • Clear text and graphical reports

High Resolution Particle Size Analysis

By providing both centrifugal and gravitational sedimentation in one instrument the BI-XDC brings these well established methods of particle sizing up to date for today's fine particle technology. With an X-ray technology to give error free measurements, fast and accurate size distributions across the "one-micron" transition region are easily obtained. Now, with a single instrument you can get true high resolution, accurate, particle size distributions from 10 nanometers right up to 100 microns. Brookhaven's advanced scanning detector technology and wide disc speed range lets you optimize analysis times and broaden the range of samples you can analyze.

With the Brookhaven Bl-XDC there are no optical corrections and no optical properties to worry about, just a simple mass sensitive response based on X-ray absorption.

Data Presentation
Typical runs take 3-30 minutes and are dependent upon the particle size range to be determined. Real-time progress of the experiment is plotted on the screen. Standard plots include differential and cumulative distributions of particle sizes weighted by volume, surface area and number on linear and logarithmic scales. Up to six plots can be overlayed for comparisons. Additional tabular and other choices of display provide customized reports for a wide variety of purposes including SPC charts. A menu of data files allows easy analysis of multiple experiments.

Cumulative and Differential Distributions from Two Silicas

Comparison of Cumulative Distributions of Six Samples

Principles of Operation
Particles suspended in a liquid medium which has a density lower than that of the particles will eventually settle to the bottom. In either the gravitation or centrifugation settling mode, large particles move faster than small ones. Hence particles separate on the basis of their size and this method of particle size analysis yields excellent results of even complex mixtures. The concentration gradient that is produced results in good resolution. The settling phenomena are accurately described by Stokes' Law. Based on a homogeneous start, the exact equations are solved for the size versus cumulative mass undersize distribution. X-ray detection ensures accurate and quantitative measurement. Stokes law may be written as below.


Size Range 0.01-100 microns, depends on particle and liquid density and liquid viscosity
Centrifuge Speed 500-6000 rpm, +/-0.01%, high speed disc available see options
Disc PMMA construction, 10-30 mL volume, solvent resistant disc available see options
Scanning Speed 0.05-10 mm/min, 1 mm/min typical
Measurement Time 3-30 min, typically 8 min/decade in particle diameter,
Data System High-performance Windows™ system with color printer. Contact factory for latest specifications
Software Written for Windows™, control, archiving and data analysis,
Power Requirements 100/115/240 VAC, 50/60 Hz, 300 Watts,
Dimensions 230(H) x 460(W) x 600(D), mm
Weight 35 kgs
Certifications CE Marked