Dresden 2009 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 36: Particles and clusters
O 36.2: Vortrag
Mittwoch, 25. März 2009, 15:15–15:30, SCH A01
Aqueous Suspensions of Detonation Nanodiamond Particles, Investigations of Deaggregation and Deagglomeration with Mechanical Disintegration Methods — •Martin Rudolph1, 2, Jörg Opitz2, Inga Hannstein2, Urs Alexander Peuker1, and Jürgen Schreiber2 — 1TU Bergakademie Freiberg, Institut für Mechanische Verfahrenstechnik und Aufbereitungstechnik, Freiberg, Germany — 2Fraunhofer Institut für zerstörungsfreie Prüfverfahren, Dresden, Germany
Detonation synthesized Nanodiamonds (DND) have been of great interest since their discovery in the mid 1960s. They were first published in 1988. First applications in the fields of Material and Life Sciences are already being established.
This study deals with aqueous suspensions of DND and the possibilities of producing stable colloidal dispersions only by mechanical disintegration methods and electrostatic stabilization. Three methods of disintegration were utilized including a planetary ball mill, a 200 W Ultrasound device with sonotrode as well as the new method of bead assisted sonic deaggregation (BASD) first published by Ozawa et al. A new model of the aggregates before and after mechanical treatment is established showing a difference between the methods of hard and soft disintegration, referring to milling as well as BASD and simple ultrasound, respectively. To the knowledge of the author it was the first time reagglomeration effects have been found to take place while mechanically disintegrating DND particles. A theoretical model for this effect has been developed therefore.