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 Particle Size / Zeta Potential
Particle Size
We offer measurement of particle size distribution by laser light scattering (diffraction) for particles in the range 40nm to 2,500 um. Powder samples can be analyzed as received (dry) or, more usually, in liquid suspension. Liquid suspensions require much less sample than does a dry analysis. Of course, your sample should not be soluble if you opt for liquid mode. We can analyze in water or isopropanol, with or without the addition of surfactants and other dispering agents, with or without ultrasonic dispersion. If you have an established protocol, please submit it with your sample(s). Our lab staff will be happy to provide advice and to discuss any limitations which might arise.
Zeta Potential
If you are interested in colloidal (nanoparticle suspension) stability and flocculation studies, then you will be interested in zeta potential. We will analyze your sample (particle size range <1 to >400 microns) using classical electrophoretic mobility. That is, we directly measure the velocity of the particles in an electrical field due to the charge associated with the particles in a liquid suspension. We even provide you with a high magnification optical micrograph of your sample so you can see exactly what we measured! The analysis is normally made in deionized water (pH 7) unless you indicate that a different pH be used. The effect of surfactants, flocculants, varying pH and ageing can be studied. Please contact the lab to discuss this type of project work before submitting samples.
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Analysis Types
06006-L
 Particle Size Distribution by Laser Diffraction, WetParticle size distribution of powder analyzed by laser diffraction in liquid suspension. Specify water or isopropanol. Samples are usually submitted dry, though predispersed suspensions can be accepted. Graphical and tabular results reported. 
06006-D
Particle Size Distribution by Laser Diffraction, DryParticle size distribution of powder analyzed by laser diffraction in dry form. Powder is dispersed in a stream of compressed air. Graphical and tabular results reported. 06006-Z
Zeta PotentialZeta potential of fine particles measured by classical electrophoretic mobility. Sample dispersed in deionized water (pH7) unless requested otherwise. Samples are usually submitted dry, though predispersed suspensions can be accepted. ZP value and photomicrograph reported.
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