Usoltseva L O, Volkov D S, Nedosekin D A, Korobov M V, Proskurnin M A, Zharov V P
Chemistry Department, Lomonosov Moscow State University, Moscow, 119991, Russia.
Philips Classic Laser Laboratories, University of Arkansas for Medical Sciences, Little Rock, Arkansas, 72205, USA.
Photoacoustics. 2018 Oct 28;12:55-66. doi: 10.1016/j.pacs.2018.10.003. eCollection 2018 Dec.
The multispectral modality and technique for optically dense samples of optoacoustic spectroscopy were applied to measure spectra and high absorbances of concentrated aqueous dispersions of undoped nanodiamonds. The data from optoacoustic and optical transmission measurements and DSC data of the mean particle size by the Gibbs-Kelvin equation are compared to estimate the difference in composition of various nanodiamond trademarks. Optoacoustic spectra confirm the contribution of surface dimer chains into the absorption of nanodiamonds in the long wavelength range. Optoacoustic and conventional absorption spectra of aqueous solutions of nanodiamond fractions after centrifugation (15300) and ultracentrifugation (130000) revealed a separation of a highly absorbing non-diamond sp phase. The two-step separation by ultracentrifugation followed by extra centrifugation made it possible to isolate a highly absorbing and soluble nanodiamond phase with the particle size of 3.6 nm, showing a change in spectra compared to the starting nanodiamond material.
将光声光谱法用于光学致密样品的多光谱模态和技术，应用于测量未掺杂纳米金刚石浓水分散体的光谱和高吸光度。比较光声和光透射测量数据以及通过吉布斯-开尔文方程得到的平均粒径的DSC数据，以估计各种纳米金刚石商标的成分差异。光声光谱证实了表面二聚体链对纳米金刚石在长波长范围内吸收的贡献。离心（15300）和超速离心（130000）后纳米金刚石级分水溶液的光声光谱和传统吸收光谱显示出高吸收非金刚石sp相的分离。通过超速离心后再进行额外离心的两步分离，使得能够分离出粒径为3.6 nm的高吸收且可溶的纳米金刚石相，与起始纳米金刚石材料相比，其光谱发生了变化。
