Biomedical Engineering Reference
In-Depth Information
G-1
(PlasmaChem,
Germany)
Carbon
dioxide
Unknown
Ca (0, 41)
Fe (0, 25)
Si (0, 28)
Cl (0, 06)
2, 1
High
1
Type of sample (tentative names).
2
Determined by X-ray dispersion analysis and secondary ion mass spectrometry.
3
Measured by thermal desorption of nitrogen (*data of the producers).
4
Total amount of volatiles released under the heating up to 1100°C in vacuum.
5
Estimated using the kinetics of optical transmission of water suspension of UDD
(0.02%).
5
4
3
2
1
4000
3500
3000
2500
2000
1500
1000
W AVEN U MBER (cm
-1
)
Figure 6.2
FTIR spectra of detonation nanodiamonds of different types.
(1) G-1; (2) CH-7; (3) K-2; (4) B-1; and (5) S-1.
The details of IR spectra taken from the UDD samples are strongly
dependent on the type of UDD (Fig. 6.2). Besides the shape of the
complex band in the 1400-900 cm
-1
region, the main differences are
in the intensity of C-H vibrations (near 2900 cm
-1
), and, what is more
important, in the position of the characteristic line of C-O groups
located between 1720 cm
(sample
S-1). The last observation indicates a substantial difference in the
structure of the CO-containing species, including carbonyl, lactone,
and acid anhydride groups [46], on the surface of UDD from different
producers. Though the interpretation of infrared spectra details of
UDD is rather speculative and ambiguous, IR spectroscopy is widely
used to characterize the surface chemistry of UDD due to relative
simplicity of measurement procedure. In a first approximation, FTIR
spectroscopy could be considered as a rapid method to obtain the
“finger prints” of UDD of different origin.
-1
(sample CH-7) and 1850 cm
-1
