Abstract

The electrosurface properties have been experimentally studied for different monodisperse fractions of hydrosol particles of detonation nanodiamond (DND) obtained by air annealing of particle agglomerates, their deagglomeration by sonication in demineralized water, and subsequent centrifugation of resulting hydrosols. The acid-base potentiometric titration and laser Doppler electrophoresis have been employed to obtain the pH dependences of the surface charge density and electrophoretic mobility of the nanoparticles in hydrosols containing 0.001 M KCl within a pH range of 3.5–10.5. A decrease in the average size of DND nanoparticles leads to an increase in the absolute values of the density of their negative surface charge. The high surface potential values calculated for these DND samples are independent of the nanoparticle size. The absolute values of the electrokinetic charge density, which are an order of magnitude lower than those of the surface charge, increase significantly with a decrease in the particle size.

中文翻译：

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爆炸纳米金刚石溶胶的电表面性质取决于分散颗粒的大小

摘要

对于通过粒子团聚体的空气退火，通过在软化水中进行超声处理使其解团而获得的爆轰纳米金刚石（DND）的水溶胶颗粒的不同单分散级分，已通过实验研究了其电表面性质。酸碱电位滴定法和激光多普勒电泳法已被用来获得表面电荷密度的pH依赖性和纳米颗粒在pH范围为3.5-10.5的含0.001 M KCl的水溶胶中的电泳迁移率。DND纳米颗粒的平均尺寸的减小导致其负表面电荷密度的绝对值增加。为这些DND样品计算出的高表面电势值与纳米颗粒尺寸无关。