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High-resolution particle sizing by optical tracking of single colloidal particles

Author

Listed:
  • Garbow, Norbert
  • Müller, Jürgen
  • Schätzel, Klaus
  • Palberg, Thomas

Abstract

The motion of individual Brownian particles is observed using the confocal Tracking Microscope recently introduced by Schätzel (K. Schätzel, W. G. Neumann, J. Müller and B. Materzok, App. Opt. 31 (1992) 770–778). Particles are laterally trapped in a strongly focused laser beam. By evaluating the light-pressure-induced drift velocity and the backscattered intensity we are able to detemine particle size histograms with a resolution better than 2%. This is demonstrated on a mixture of seven species of polystyrene latex spheres in the diameter range between 300 and 450 nm, where six classes of diameters are identified. We discuss the scope of the method and potential applications.

Suggested Citation

  • Garbow, Norbert & Müller, Jürgen & Schätzel, Klaus & Palberg, Thomas, 1997. "High-resolution particle sizing by optical tracking of single colloidal particles," Physica A: Statistical Mechanics and its Applications, Elsevier, vol. 235(1), pages 291-305.
    • Handle: RePEc:eee:phsmap:v:235:y:1997:i:1:p:291-305
    DOI: 10.1016/S0378-4371(96)00349-4
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    References listed on IDEAS

    as
    1. Denkov, Nikolai D. & Petsev, Dimiter N., 1992. "Light scattering and diffusion in suspensions of strongly charged particles at low volume fractions," Physica A: Statistical Mechanics and its Applications, Elsevier, vol. 183(4), pages 462-489.
    2. Michael Pusey, 1990. "The Impact Of Economic Ideas On Public Policy In Canberra?," Economic Papers, The Economic Society of Australia, vol. 9(4), pages 80-90, December.
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