The chemistry of the surface of modified detonation nanodiamonds of different types

Abstract

-The influence of standard chemical treatment used to extract interstellar nanodiamonds from meteorites on the chemical composition of the surface of synthetic nanodiamonds with substantially different properties was studied by thermal desorption mass spectrometry and IR spectroscopy. The chemistry of the surface of nanodiamonds after treatment was substantially different from that of initial particles. The suggestion was made that the chemical structure of the surface of diamond particles in the interstellar space could be reconstructed from the data on meteorite diamonds. Mass spectrometric studies also gave information about possible mechanisms of the release of noble gases from meteorite diamonds at various temperatures.

Inelastic neutron scattering: a novel approach towards determination of equilibrium isotopic fractionation factors. Size effects on heat capacity and beta-factor of diamond

“…To reduce contribution of adsorbed water the samples were first vacuum-heated to 500 K and then gradually cooled. Though 500 K is insufficient for complete water desorption from 5 nm nanodiamonds 15,16 , our INS spectra show some contributions of the adsorbed hydrogen.…”

Effects of sonochemical treatment on meteoritic nanodiamonds

“…As mentioned in the introduction, the surface chemistry of meteoritic nanodiamonds may inherit primary features of the grains, reflecting their history prior to entrapment by the parent meteorite (Garvie ; Koshcheev et al. ). It is also reasonable to assume that behavior of different surface groups during parent body metamorphism and laboratory chemical treatment may vary.…”

“…In our view, the key factor responsible for the separation of the initial OD7 sample into the fractions with different properties is the surface chemistry of nanodiamond grains. As mentioned in the introduction, the surface chemistry of meteoritic nanodiamonds may inherit primary features of the grains, reflecting their history prior to entrapment by the parent meteorite (Garvie 2005;Koshcheev et al 2008). It is also reasonable to assume that behavior of different surface groups during parent body metamorphism and laboratory chemical treatment may vary.…”

“…Partly, these groups are dependent on chemicals used in the separation process, but at least some of the surface groups are pristine (Koshcheev et al. ).…”

“…Surface functional groups of meteoritic nanodiamonds include carboxyl, hydroxyl, lactone, and N-rich compounds (e.g., Lewis et al 1989;Braatz et al 2000;Merchel et al 2003). Partly, these groups are dependent on chemicals used in the separation process, but at least some of the surface groups are pristine (Koshcheev et al 2008).…”