Abstract Detonation nanodiamonds (DND), their properties and deaggregation remain an active field of research. Here we innovated the salt-assisted ultrasonic deaggregation (SAUD) by employing NaHCO3 (a milling agent with relatively low solubility) followed by dialysis (a purification step) and processed two DND and one laser-synthesized (LND) commercial powders. The obtained ND colloids were separated to single-digit supernatant with the yield of 57–65% and sediment fractions by centrifugation and analyzed separately. By thermal analysis we evidenced chemical sensitization of the SAUD-processed DNDs manifested by significantly lower combustion temperatures. By correlation of spectroscopic, microscopic, and thermal analysis techniques we revealed a size and shape inhomogeneity of primary DND particles, also affecting strength of aggregation. By elemental analysis of the fractions we also show that nitrogen content is systematically higher in the smaller primary DND particles. Those features are inherent to all the three ND samples. The provided analyses highlight the need for better understanding of relations between detonation synthesis parameters and properties of the synthesized DNDs in terms of DND primary particle size, aggregation and nitrogen incorporation.

中文翻译：

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通过盐辅助解聚揭示爆炸和激光合成初级纳米金刚石颗粒的尺寸和氮不均匀性

摘要 爆轰纳米金刚石 (DND)，其性质和解聚仍然是一个活跃的研究领域。在这里，我们通过使用 NaHCO3（一种溶解度相对较低的研磨剂）和透析（纯化步骤）并处理两种 DND 和一种激光合成 (LND) 商业粉末，对盐辅助超声解聚 (SAUD) 进行了创新。获得的 ND 胶体通过离心分离为个位数的上清液，产量为 57-65%，沉淀物部分通过离心分离并单独分析。通过热分析，我们证明了 SAUD 处理的 DND 的化学敏化，表现为燃烧温度显着降低。通过光谱、显微镜和热分析技术的相关性，我们揭示了初级 DND 粒子的大小和形状不均匀性，这也会影响聚集强度。通过组分的元素分析，我们还表明较小的初级 DND 颗粒中的氮含量系统地较高。这些特征是所有三个 ND 样本所固有的。所提供的分析强调需要更好地理解爆炸合成参数与合成的 DND 的性质在 DND 初级粒径、聚集和氮掺入方面的关系。