Characterization of stability of ceramic suspension for slurry introduction in inductively coupled plasma optical emission spectrometry and application to aluminium nitride analysis

Abstract

Characterization of the stability of ceramic suspension for slurry introduction in inductively coupled plasma optical emission spectrometry (ICP-OES) and its application to the analysis of aluminium nitride (AlN) was reported in this paper. Stability and homogeneity suspensions of mm sized AlN and nm sized AlN, as the representatives selected, were characterized by sedimentation test, scanning electron microscope observation and zeta potential measurement. The zeta potential of the interface between the particle and the medium can be controlled by pH adjustment and adding 0.8 wt% polyethylene imine (PEI) for mm size AlN or 2.0 wt% PEI for nm size AlN, respectively. The analytical results obtained via slurry introduction were compared with those via nebulization of aqueous solutions prepared by fusion digestion. The nm size AlN can be directly analyzed by using slurry nebulization ICP-OES with aqueous standards calibration, and the impurities Cu, Fe, Mg, Mn, etc. in mm size AlN can also be determined by slurry method, but the results of some elements with high boiling points, such as Si, Y, etc., show deviation from the reference values.

Direct ink writing of macroporous lead‐free piezoelectric Ba0.85Ca0.15Zr0.1Ti0.9O3

“…The results displayed in Figure B indicate that electrostatic stabilization is likely to be achieved within the neutral to moderately alkaline pH range under all tested conditions as colloidal stability is expected when | ζ | is larger than 30 mV . However, significant improvements in dispersion ability are obtained using the surface‐treated powder in the presence of 1.0 wt% dispersant, while excessive amounts may lead to instability of suspensions, as previously reported . Based on these results, 1.0 wt% of dispersant was chosen to proceed with further experiments aiming at preparing concentrated BCZT suspensions.…”

Thermal Conductivity of AlN–Ethanol Nanofluids

“…The resulting suspension was placed in an ultrasonic homogenizer for 10 min. There are three kinds of dispersants for AlN particle-ethanol suspensions: NH 4 PAA, polyethylene imine (PEI), and castor oil [3,4]. In this work, castor oil, the most easily available, was used.…”

Synthesis of polyethyleneimine capped carbon dots for preconcentration and slurry sampling analysis of trace chromium in environmental water samples

“…Therefore, it is vital to determine the isoelectric point for the preparation of stable slurry [45].…”