Record details

    Low-angle laser light scattering of kaolins
Statement of responsibility
    Pabst W., Kuneš K., Gregorová E., Havrda J.
Other titles
    Sixteenth Conference on Clay Mineralogy and Petrology in Karlovy Vary (Czech Republic), August 27-31, 2000 (Variant.)
    Gregorová, E.
    Havrda, Jiří
    Kuneš, K.
    Pabst, Willi
Source title - serial
    Acta Universitatis Carolinae. Geologica
    Vol. 44, no. 2-4
    p. 125-129
    Bibliografie na s. 128-129
    Zkr. název ser.: Acta Univ. Carol., Geol.
Classfication no.
Conspectus category
Subject group
    Český masiv
    ložisko kaolinu
    metoda laserová
    metody analytické
    mineralogie jílová
Geographical name
Abstract (in english)
   The present contribution reviews LALLS measurement and evaluation procedures and compares them with sedimentation and other particle sizing methods (especially dynamic light scattering and single-particle optical sensing). The importance of particle statistics for an adequate comparison of results is stresses, the problem of anisometric particle shape is discussed and a method to quantify shape information is described. This method, recently developed at the ICT Prague, allows a shape factor for ablate particles to be extracted from a comparison of sedimentation and LALLS results, when the LALLS data (volume-eighted cumulative curves) are taken to be exact in terms of equivalent disc diameters, and a modified Stokes la is used to evaluate the sedimentation data. LALLS measurements of different types of Czech floated kaolins (from the Plzeň Basin area, the Karlovy Vary area and the Podbořany deposit) are presented and compared with sedimentation results.
   The quantification of shape information indicates that the aspect ratio of kaolinite platelets is usually underestimated and that aspect ratios of twenty and higher are most commonly encountered in floated kaolins, lower values being indicative of a higher quartz content. DLS and SPOS results are mentioned for comparison
    Česká geologická služba
Contributor code
    ČGS (UNM)
Source format
Entered date
    16. 9. 2008
Import date
    8. 8. 2012