APPARATUS TO MEASURE ELECTROPHORETIC MOBILITY

Described are examples of an apparatus for measuring electrophoretic mobility. The apparatus is configured as an optical interferometer wherein a sample to be analyzed in placed on one arm of the interferometer. Polarization-maintaining optical fibers and optical components maintain polarization sta...

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Bibliographische Detailangaben
Hauptverfasser:	Rahmlow, David, Trainoff, Steven P
Format:	Patent
Sprache:	eng
Schlagworte:	INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIRCHEMICAL OR PHYSICAL PROPERTIES MEASURING PHYSICS TESTING
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Beschreibung
Zusammenfassung:	Described are examples of an apparatus for measuring electrophoretic mobility. The apparatus is configured as an optical interferometer wherein a sample to be analyzed in placed on one arm of the interferometer. Polarization-maintaining optical fibers and optical components maintain polarization stability and performance of the interferometer. Rayleigh scattered light from the sample is combined with light from the reference arm of the interferometer. The scattered light is shifted in frequency with a corresponding signal having a magnitude that is proportional to the velocity of the particles in solution. Particle velocity is a function of solvent viscosity, particle size, applied field strength, and electric charge. Measurement of electrophoretic mobility and particle size can be used to calculate the electric charge of the particles.