Detailed and unambiguous characterization of the surface structure detonation nanodiamond (DND) particles remains one most challenging tasks for preparation chemically functionalized nanodiamonds. In present paper, a combination FTIR, NMR, XPS was used to characterize DND that were treated in reduction reaction results enrichment hydroxyl hydroxymethyl functional groups. FTIR spectra quantum-chemistry modeling demonstrated vacuum treatment sample, with purpose removing adsorbed water other...

We present the first review of current state literature on electronic properties and phase transitions in TlX TlMX2 (M = Ga, In; X Se, S, Te) compounds. These chalcogenides belong to a family low-dimensional semiconductors possessing chain or layered structure. They are significant interest because their highly anisotropic properties, semi- photoconductivity, nonlinear effects I–V characteristics (including region negative differential resistance), switching memory effects, second harmonic...

This work examines several polycrystalline diamond samples for their potential as polarizing agents dynamic nuclear polarization (DNP) in NMR. Diamond of various origin and particle sizes ranging from a few nanometers to micrometers were examined by EPR, solid-state NMR DNP techniques. A correlation was found between the size particles electron spin–lattice relaxation time, 13C times room temperature magic-angle-spinning experiments, ability carbons be hyperpolarized irradiating unpaired...

We report on the first 1H NMR relaxation and magnetic resonance imaging (MRI) study of aqueous suspensions detonation nanodiamond (DND) grafted by Gd(III) ions. In contrast to Gd(III)–ND conjugates implemented via organic species, ions were directly surface DND particles. Such Gd(III)-grafted particles significantly shorten spin–lattice (T1) spin–spin (T2) times water protons providing relaxivities r1 = 33.4 r2 332 mM–1 s–1, which considerably exceed most those reported in literature. It...

Purpose Testing the potential use of saline suspension polyvinylpyrrolidone (PVP)‐coated gadolinium(Gd)‐grafted detonation nanodiamonds (DND) as a novel contrast agent in MRI. Methods Stable suspensions highly purified de‐agglomerated Gd‐grafted DND particles coated by PVP protective shell were prepared. T 1 and 2 proton relaxivities with varying gadolinium concentration measured at 8 Tesla. A series ex vivo (phantom) dynamic scans obtained 3 Tesla MRI using PVP‐coated gadoterate meglumin...

This critical review examines the Nuclear Magnetic Resonance (NMR) studies of diamond nanoparticles that have been carried out for past decade. Investigations purified nanodiamonds and those with chemically modified surfaces are reviewed in detail. These findings discussed together results obtained by other methods. For non-experts magnetic resonance, basic principles NMR experiments an introduction to interpretation parameters carbon nanostructures given.

Grafting of paramagnetic transition and rare earth metal ions onto the surface detonation nanodiamonds (DNDs) was successfully implemented in recent decade opened new opportunities biomedical application these compounds, particularly as novel contrast agents for magnetic resonance imaging. The grafting studied mainly using EPR, NMR, measurements. Such a highly surface-sensitive, quantitative, chemical analytic technique X-ray photoelectron spectroscopy (XPS) very rarely used. In this paper,...

We report on detailed study of detonation nanodiamonds (DNDs) whose surface has been chemically modified by copper with the aid ion exchange in water DND suspension. High resolution transmission electron microscopy, Raman, IR, magnetic resonance (EMR), nuclear (NMR), and superconducting quantum interference device techniques were used for characterization DND. Carboxyl groups, appearing a nanodiamond particle during its synthesis purification processes, provide an effective binding divalent...

We report on the first nuclear magnetic resonance (NMR) and electron paramagnetic (EPR) study of high-temperature nanodiamond-to-onion transformation. 1H, 13C NMR EPR spectra initial nanodiamond samples those annealed at 600, 700, 800 1800 ° C were measured. For 600 to C, our data reveal early stages surface modification, as well a progressive increase in sp2 carbon content with increased annealing temperature. Such quantitative experimental recorded for time. These findings correlate...

Magnetic resonance techniques (electron paramagnetic (EPR) and nuclear magnetic (NMR)) are used for tracking the multi-stage process of fabrication fluorescent nanodiamonds (NDs) produced by high-energy electron irradiation, annealing, subsequent nano-milling. Pristine commercial high pressure temperature microdiamonds (MDs) with mean size 150 μm contain ~5 × 1018 spins/g singlet (S = 1/2) substitutional nitrogen defects P1, as well sp3 C–C dangling bonds in crystalline lattice. The...

We report on EPR and 13C 1H NMR studies of detonation nanodiamond particles with surface grafted by paramagnetic gadolinium ions obtained ion exchange hydrogen atoms carboxyl groups through the reaction aqueous suspension an solution nitrate. Our findings give clear evidence that Gd3+ are chemically bound to interact electron nuclear spins diamond nanoparticle, which results in acceleration spin–lattice relaxations. A model positioning DND terminated oxygen-containing is suggested. The...

We report on a combined investigation of the structure and chemical bonding in fluorinated detonation nanodiamond by means nuclear magnetic resonance, electron paramagnetic X-ray photoelectron spectroscopy, Raman measurements. The results these methods are found to be consistent with each other evidence formation different fluorocarbon groups surface, which substitutes for hydrocarbon hydroxyl groups. data obtained provide detailed information about diamond nanoparticle. sample has...

We report on a 1 H NMR study of diamond nanoparticles decorated by copper and cobalt. Increase in the relaxation rate under decoration results from interactions hydrogen nuclear spins surface hydrocarbon hydroxyl groups with paramagnetic cobalt ions. This finding reveals appearance Cu 2+ or Co ions detonation nanodiamond (DND) rather than as separate phase, which is consistent 13 C data same samples. Our shed light mechanism ion incorporation. A topological model for relative position atoms...

Size dependence of physical properties nanodiamond particles is crucial importance for various applications in which defect density and location as well relaxation processes play a significant role. In this work, the impact defects induced by milling micron-sized synthetic diamonds was studied magnetic resonance techniques function particle size. EPR 13C NMR studies highly purified commercial micro- nanodiamonds were done fractions separated sizes. Noticeable acceleration nuclear...

Detonation nanodiamonds (DNDs) have emerged as promising candidates for a variety of biomedical applications, thanks to different physicochemical and biological properties, such small size reactive surfaces. In this study, we propose carbon dot decorated single digit (4–5 nm diameter) primary particles detonation nanodiamond fluorescent probes. Due their intrinsic fluorescence originating from tiny (1–2 atomic layer thickness) carbonaceous structures on surfaces, they exhibit brightness...

We report on magnetic susceptibility, NMR, and EPR measurements of pristine Fe-doped micro- nanosized graphenes (LGr NGr), prepared by a unique microwave enabled technique from graphite particles. Significant orbital diamagnetism in the studied compounds (∼70% that bulk graphite) is revealed. At T < 30 K, weak paramagnetism due to edge π-electronic spin states observed. Reduction lateral size graphene sheets results suppression strengthening paramagnetic contribution an increased number open...