Chemisorption of phosphoric acid and surface characterization of as passivated AIN powder against hydrolysis
authors Ganesh, I; Olhero, SM; Araujo, AB; Correia, MR; Sundararajan, G; Ferreira, JMF
nationality International
journal LANGMUIR
keywords ALUMINUM NITRIDE POWDER; AUGER-ELECTRON SPECTROSCOPY; THERMAL-CONDUCTIVITY; ALN POWDERS; DISPERSION; ADDITIVES; CERAMICS; NITROGEN; OXYGEN; PHASE
abstract By simply refluxing a commercial AIN powder in a mixture solution of ethanol, H3PO4, and Al(H2PO4)(3) for 24 h at 80 degrees C, the powder was successfully passivated against hydrolysis. The phosphate layer formed on the surface of AIN powder was found to be quite stable toward protecting the powder from hydrolysis. The efficacy of the coating was established by suspending the treated and the untreated powders in water for 72 h and subsequently characterizing them by X-ray diffraction (XRD), Fourier transform infrared, (FT-IR), X-ray photoelectron spectroscopy (XPS), transmission electron microscopy (TEM), and Raman analysis. The good dispersing behavior of the treated AIN powder in water was confirmed by the low viscosity of an AIN suspension containing 50 vol % solids demonstrating the viability of replacing organic solvents by water in colloidal processing of AIN-based ceramics.
publisher AMER CHEMICAL SOC
issn 0743-7463
year published 2008
volume 24
issue 10
beginning page 5359
ending page 5365
digital object identifier (doi) 10.1021/la800075b
web of science category Chemistry, Multidisciplinary; Chemistry, Physical; Materials Science, Multidisciplinary
subject category Chemistry; Materials Science
unique article identifier WOS:000255856100028
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journal impact factor 3.557
5 year journal impact factor 3.702
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