Interactions of nanodiamonds and surfactants in aqueous suspensions

Abstract

In this study, with the use of laser Raman spectroscopy the significant difference in intermolecular interactions of detonation nanodiamonds with hydrophilic and hydrophobic surface groups in aqueous solution of surfactants was observed. It was found that at low concentrations of sodium octanoate (before the micelle formation) the weakening of hydrogen bonds by nanodiamonds has a different dynamics for hydrophobic and hydrophilic nanodiamonds. However, with the addition of surfactants, this effect gradually decreases for both types of nanodiamonds and ends after the formation of micelles. Such effects are explained by the "shielding" effect of surfactant molecules surrounding nanodiamond particles.

The use of nanocluster polyoxometalates in the bioactive substance delivery systems

“…Both the explosive itself and graphite can serve as sources of carbon for the synthesis of nanodiamonds. The characteristic size of diamond crystals obtained by the above-described synthesis methods ranges from a few to tens of nm, and the crystals can also exist in the form of aggregates [264,265] Methods for disaggregating the obtained material are available [266][267][268][269]. In addition to dynamic synthesis, the research on the synthesis under static conditions is underway The composition of impurities in the case with the detonation production method includes carbon in the form of graphite and non-combustible impurities (metals and oxides) [254,261].…”