Müller, Rainer and Knapp, Michael and Heckmann, Klaus and Von Ruthendorf, M. and Boden, G. (2004) Protecting Nanoscaled Non-oxidic Particles from Oxygen Uptake by Coating with Nitrogen-Containing Surfactants. Langmuir 20 (7), pp. 2598-2606.
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To suppress the reactivity of nanoscaled nonoxidic powders of Ti nitride (TiN) and Si carbonitride (SiCN) against hydrolysis and oxidn., chem. surface modification with N-contg. surfactants was studied. Among these surfactants, long-chain primary amines, ethylenediamines, guanidines, nitriles, isocyanates, and succinimides were examd. TG, elemental anal., and behavior against the H2O-vapor adsorption of the modified particles were used as methods to est. the protective capacity of the org. coating material. The best results were obtained by using the long-chain amines and octadecylisocyanate, which were indicated by a significant shift of the powder oxidn. toward the higher temps. and an increase of the particle hydrophobicity. A long-chain succinimide is the most effective in dispersing nanoscaled TiN in org. media. Prepn. of a stable aq. dispersion without significant changes in the elemental compn. of the powder was achieved by the application of an ionic surfactant to the surface-modified particles.
|Institutions:||Chemistry and Pharmacy > Institut für Physikalische und Theoretische Chemie > Chair of Chemistry VI - Physical Chemistry (Solution Chemistry) > Prof. Dr. Werner Kunz|
|Keywords:||titanium nitride coated powder solvent dispersing silicon carbonitride coated powder solvent dispersing|
|Subjects:||500 Science > 540 Chemistry & allied sciences|
|Refereed:||Yes, this version has been refereed|
|Created at the University of Regensburg:||Yes|
|Deposited On:||19 Jun 2012 08:03|
|Last Modified:||19 Jun 2012 08:03|
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