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Protecting of Nanoscaled nonoxidic Particles from Oxygen Uptake by Coating with Nitrogen Containing Surfactants

Schutz nanoskaliger nichtoxidischer Pulver vor Sauerstoffaufnahme durch Beschichtung mit stickstoffhaltigen Tensiden
 
: Müller, R.; Knapp, M.; Heckmann, K.; Ruthendorf, M. von; Boden, G.

Materials Week 2001. Proceedings. CD-ROM : Papers, keynotes and plenaries of Materials Week 2001, International Congress on Advanced Materials, their Processes and Applications, 1 - 4 October 2001, International Congress Centre Munich
Frankfurt: Werkstoffwoche-Partnerschaft GbRmbH, 2002
ISBN: 3-88355-302-6
Werkstoffwoche <2001, München>
English
Conference Paper
Fraunhofer IKTS ()
Konditionierung; Schutz; oxidation; Hydrolyse; Tenside; Amin; Nanoskalige Pulver; Titaniumnitrid; Titaniumcarbid; Siliciumcarbonitrid

Abstract
To suppress the reactivity of nanoscaled powders titaniumnitride, titaniumcarbide and siliconcarbonitride with oxygen and water, chemical surface modification with nitrogen containing surfactants was investigated.Among these surfactants long chain primary amines, ethylen diamines, guanidines, nitriles und succinimides were examined.It was found, that the oxygen uptake of the treated powders decreased as the number of carbon atoms in nitrogen containing surfactants increased. Significant differences in the protection efficiency according to the polar head groups of the surfactants were observed.Chemical stability increased within the following sequence:Nitrile