Absorption spectra of nanodiamond aqueous dispersions by optical absorption and optoacoustic spectroscopies.

ABSTRACT: 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 (15300g) and ultracentrifugation (130000g) revealed a separation of a highly absorbing non-diamond

SUBMITTER: Usoltseva LO 

PROVIDER: S-EPMC6222039 | biostudies-literature | 2018 Dec

REPOSITORIES: biostudies-literature