Diamond nanoparticles, known as nanodiamonds (NDs), possess several medically significant properties. Having a tailorable and easily accessible surface gives them great potential for use in sensing and imaging applications and as a component of cell growth scaffolds. In this work we investigate in vitro interactions of human osteoblast-like SAOS-2 cells with four different groups of NDs, namely...

In this article, the spectroscopic methods used to assess gem-quality diamonds are reviewed. From such measurements it is possible to determine, in the majority of cases, whether the colour of a stone is natural, or has been changed by some form of treatment—either HPHT processing, radiation damage and annealing, or a combination of both methods. Methods used to identify synthetic diamonds are ...

Phase change and graphitization of diamonds from the Popigai impact crater (Krasnoyarsk Territory, Siberian platform, Russia) exposed to high-pressure high-temperature (HPHT) conditions 5.5 GPa 2000–2200 °C are studied by Raman spectroscopy X-ray diffractometry (XRD). Light-color type 1, free inclusions, with 0 10 % lonsdaleite, more resistant HPHT effects than dark 2 rich in lonsdaleite graphi...

Hydrogen-related infrared absorption bands in natural diamonds have been extensively investigated and widely used to identify natural, treated, synthetic grown by high pressure temperature (HPHT) chemical vapor deposition (CVD) techniques. However, the evolutional behavior of hydrogen-related defects relationship between nitrogen-related HPHT-treated Ib are unclear. In this article, defects, pa...

Using a three-phase batch reactor with coated steel panels, this investigation studies the influence of carbon dioxide (CO2), present in gas phase at conditions high pressure and temperature (HPHT), on degradation an amine-cured epoxy novolac (EN) coating. The combined effect gas, hydrocarbon, seawater compromises coating leads to underfilm corrosion. Consequently, understanding role each phase...

The authors report on a new method for the synthesis of graphene, a mono-layer of carbon atoms arranged in a honey comb lattice, and the assessment of the properties of obtained graphene layers using micro-Raman characterisation. Graphene was produced by a high pressure–high temperature (HPHT) growth process from the natural graphitic source material by utilising the molten Fe–Ni catalysts for ...

Diamond nanoparticles so-called nanodiamonds (NDs) have recently experienced raising scientific interest due to interesting optical and electronic properties, non-toxicity, biocompatibility, large surface area. Another significant feature of NDs is the versatility chemistry, where various functional groups can be attached. This provides an excellent platform for adjusting properties functions m...

The present paper reports the results of a study X-ray and Raman spectra detonation nanodiamonds after high-pressure high-temperature (HPHT) annealing at different temperatures.

The reaction between sulfur and iron under high pressure temperature (HPHT) was studied. Sulfur–iron models different levels were constructed. morphology formation mechanism of the reactants comprehensively analyzed by scanning electron microscopy, energy-dispersive spectroscopy–line scanning, metallographic Raman spectroscopy. results indicated that could significantly affect diffusion behavio...