The three-dimensional particle size and shape of mechanically delaminated talc thin platelets were determined by combining two different methods. The plate diameter was determined by microscopy with the aid of an image analyser and the thickness from the X-ray crystallite size perpendicular to the basal plane. The net line broadening of the X-ray diffraction peak, technique with an ultramicrotome.necessary for the determination of X-ray crystallite size, was evaluated by electron microscopy. In order to correct X-ray diffractometry for instrumental broadening, the platelet thickness of a representative specimen was obtained directly using a transmission electron microscope coupled with a laborious slice
The delamination of talc platelets was carried out by two different wet grinding methods, i.e., by a ball mill, and by a rod mill. The rate of rotation, grinding time and volume of suspension were systematically varied. The best talc platelets with a maximum aspect ratio of 42 were obtained when suspension with the solid volume fraction of 0.15 was filled to a volume of 25% of the capacity and rotated at 77 rpm in a ball mill. The change in the pH of the suspension and mechanical amorphization were also observed indicating simultaneous mechanical activation.
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