期刊
CARBON
卷 171, 期 -, 页码 230-239出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.carbon.2020.09.026
关键词
Detonation nanodiamond; Salt-assisted ultrasonic deaggregation; Size distribution; Colloidal solution; Nitrogen; Inhomogeneity; Surface chemistry
资金
- Czech Science Foundation (GACR) [18-11711Y]
- Ministry of Education, Youth and Sports of the Czech Republic (MEYS) [CZ.02.1.01/0.0/0.0/16_019/0000760]
- MEYS [LM2018110]
The study found that the SAUD-processed DND exhibited chemical sensitization with significantly lower combustion temperatures; analysis revealed size and shape inhomogeneity of primary DND particles, impacting aggregation strength; elemental analysis showed higher nitrogen content in smaller primary DND particles.
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. (C) 2020 Elsevier Ltd. All rights reserved.
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