Polydispersed Detonation Nanodiamond and Approaches for its Fractioning

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We will discuss the rationale and methods of fractioning of the DND depending on the sizes of the agglomerates in the initial as-received DND powder. It is well known that primary (monocrystalline) DND particles have narrow size distributions with an average size of the particles within the 3-5nm range. However, during synthesis, purification and drying of the product, tightly and loosely-bond aggregates are formed. As a first step, ultrasonic dispersion is applied to break loosely-bond aggregates followed by fractioning. Several methods of dispersion combined with fractioning will be discussed for DND synthesized from TNT/RDX explosives using ice cooling media1 and purified by acid-chrome anhydride treatment2 as well as by an ozone-purification method3. Figure 1 illustrates particle size distribution in water for DND purified by ozone. Polydispersed sample (1a) has lower sedimentation and aggregation stability than one of its fractions (1b). The role of fractioning for different applications will be outlined and the superior properties of galvanic coatings deposited using fractions as compared to coatings deposited using the initial polydispersed powder will be demonstrated.

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Journal: TechConnect Briefs
Volume: 1, Technical Proceedings of the 2006 NSTI Nanotechnology Conference and Trade Show, Volume 1
Published: May 7, 2006
Pages: 150 - 153
Industry sector: Advanced Materials & Manufacturing
Topic: Carbon Nano Structures & Devices
ISBN: 0-9767985-6-5