Phase analysis light scattering

LDE is limited by the experimental difficulty of distinguishing between collective and diffusive motion of colloidal particles 1137]. Phase analysis light scattering (PALS) was invented to overcome this difficulty. Instead of correlat-... 

Miller, J.F., Schatzel, K., and Vincent, B., The determination of very small electrophoretic mobilities in polar and non-polar colloidal dispersions using phase analysis light scattering, J. Colloid Interface ScL, 143, 532, 1991. 

Manerwatson, F., Tschamuter, W., and Miller, J., A new instrument for the measurement of very small electrophoretic mobilities using phase analysis light scattering (PALS), Colloids Surf. A, 140, 53, 1988. 

Phase Analysis Light Scattering and Forced Rayleigh Light Scattering... 

Phase analysis light scattering (PALS) is a technique that is very similar to laser Doppler electrophoresis (LDE) and is used to measure the electrophoretic mobilities of colloidal particles. This technique is particularly suited to measurements of charged particles suspended in nonpolar media and sensitivity of the method is far superior to that which could be obtained by LDE measurements. It makes use of a cross-beam technique and offsets one of the laser beams relative to the other by several kEIz. ... 

Zeta potential of the micelles is measured using a phase analysis light scattering zeta potential analyzer. Before the measurements, the micelle formulations are dialyzed against buffer solution to remove NaCl ions. Zeta potential is automatically calculated by the analyzer using the Smoluchowski equation ... 

Eppmann, P., Pruger, B., Gimsa, T., Particle Characterization by AC Electrokinetic Phenomena.2. Dielectrophoresis of Latex Particles Measured by Dielectrophoretic Phase Analysis Light Scattering (DPPALS), Colloids Surf. A., 1999, 149, 443-449. 

The present chapter is dedicated to how the zeta potential of microparticles is characterized. It is divided into five sections as follows Section 6.2 defines and describes zeta potential and introduces the most popular way to measure zeta potential, i.e., the electrophoretic mobility measurement. Section 6.3 describes the modem technology used to measure electrophoretic mobility -electrophoretic light scattering (ELS), including the optics and the sample cell followed by the data analysis of ELS experiment in Section 6.4. Section 6.5 introduces a new technique in ELS, known as phase analysis light scattering (PALS) that can be used to measure extremely small mobilities in non-polar media. 

As opposed to frequency analysis, phase analysis light scattering (PALS) analyzes particle s mobility from the phase variation of scattered light as first proposed in 1990 [64,65],... 

Miller, J., Velev, 0., Wu, S. C. C., Ploehn, H. J., A Combined Instrument for Phase Analysis Light Scattering and Dielectric Spectroscopy, J. Colloid Interface Set, 1995, 174,490-499. Pohl, H. A., Dielectrophoresis, Cambridge University Press, Cambridge, 1978. 

Miller, J. F., The Determination ofVery Small Electrophoretic Mobilities of Dispersions in Non-Polar Media Using Phase Analysis Light Scattering, PhD. Thesis, University of Bristol, Bristol, 1990. 

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