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Influence of synergistic effect between dodecylamine and sodium oleate on improving the hydrophobicity of fluorapatite

Cao Q., Luo B., Wen S., Cheng J.

Physicochemical Problems of Mineral Processing

2017

Vol. 53, iss. 1

42--55

The influence of synergistic effect between dodecylamine (DDA) and sodium oleate (NaOl) on the hydrophobicity of fluorapatite (FA) was investigated with contact angle, surface tension, XPS and zeta potential studies. The role of pH and the mixing ratio of surfactants on the synergistic behavior were considered. Basing on the contact angle results the suitable pH for the NaOl-DDA mixture was pH 9.5. A further study indicated that the 3:7 DDA-NaOl mixtures could notably improve the contact angle comparing to that only with DDA or NaOl. In the solution of this mixture, the DDA cation and DDA molecule both adsorb at the FA surface as revealed by the XPS spectra results. The zeta potential analysis further suggested that the adsorption of oleate at the FA surface was also improved. The presence of DDA cation and DDA molecule was expected to result in a uniform packing of surfactants at the FA surface.

Recent advances in gate dielectrics and polarised light emission from GaN

Pearton S. J., Abernathy C. R., Gila B. P., Onstine A. H., Overberg M. E., Thaler G. T., Jihyun K., Luo B., Mehandru R., Ren F., Park Y. D.

Opto-Electronics Review

2002

Vol. 10, No. 4

231-236

Inversion behaviour has been demonstrated in gate-controlled p-GaN diodes using both MgO and Sc₂O₃ gate dielectrics and implanted n⁺ regions to provide a source of inversion charge. The total surface state density was estimated from capacitance-voltage or charge pumping measurements to be in the range 3 - 8 x 10¹² cm² after the implant activation annealing to form the source and drain regions. In addition, Mn doping of GaN during growth by molecular beam epitaxy is found to produce room temperature ferromagnetism under conditions where the material remains single-phase. The layers can be used as injectors of spin-polarised carriers into light-emitting diode structures, with the potential for creating polarised optical output.