Journal
IEEE TRANSACTIONS ON MAGNETICS
Volume 37, Issue 4, Pages 2654-2656Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/20.951264
Keywords
colloids; nanoparticles; quantum dots; surface charging
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A new approach to calculate the surface charge density in semiconductor metal-oxide quantum dots (QDs) dispersed in alkaline aqueous colloids, at different pH values, is presented. Surface charge density up to about 0.3 C/m(2) was obtained for spherical nanoparticles in the diameter range of 8 to 14 run, at pH 10 and 12. The calculated surface charge dens in very good agreement with the average value reported in the literature, is obtained as long as a proton transfer mechanism through the semiconductor-electrolyte interface takes place. The data reported here explain the stability found in ionic magnetic fluids at the usual lower/higher pH values and particle sizes.
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