Journal articles: 'Nanodiamonds – Analysi'

1

Say, Jana M., Carlo Bradac, Torsten Gaebel, James R. Rabeau, and Louise J. Brown. "Processing 15-nm Nanodiamonds Containing Nitrogen-vacancy Centres for Single-molecule FRET." Australian Journal of Chemistry 65, no. 5 (2012): 496. http://dx.doi.org/10.1071/ch12103.

Full text

Abstract:

Colour centres in nanodiamonds have many properties such as chemical and physical stability, biocompatibility, straightforward surface functionalisation as well as bright and stable photoluminescence, which make them attractive for biological applications. Here we examine the use of fluorescent nanodiamonds containing a single nitrogen-vacancy (NV) centre, as an alternative nano-label over conventional fluorophores. We describe a series of chemical treatments and air oxidation to reliably produce small (~15 nm) oxidised nanodiamonds suitable for applications in bioscience. We use Förster resonance energy transfer to measure the coupling efficiency from a single NV centre in a selected nanodiamond to an IRDye 800CW dye molecule absorbed onto the surface. Our single-molecule Förster resonance energy transfer analysis, based on fluorescence lifetime measurements, locates the position of the photostable NV centre deep within the core of the nanodiamond.

APA, Harvard, Vancouver, ISO, and other styles

2

Bai, Bo, Peng Peng Wang, Li Yang, and Yong Jun He. "Fabrication of Polystyrene-Encapsulated Nanodiamond via In Situ Latex Polymerization and their Wettability Evaluation." Advanced Materials Research 79-82 (August 2009): 1839–42. http://dx.doi.org/10.4028/www.scientific.net/amr.79-82.1839.

Full text

Abstract:

Nanodiamonds coated with polystyrene were prepared by in-situ latex polymerization using azobisisobutylonitrile as initiator in alcohol-water solution. The products were characterized by transmission electron microscope, X-ray diffraction, thermo-gravimetric and differential thermal analysis and Fourier transformation infrared spectrum. A possible formation mechanism and the structure of products were proposed. The experimental evaluation of wettability performance showed that the hydrophobicity of nanodiamond have been enhanced with the wrapping of polystyrene films on the surface of nanodiamond particles.

APA, Harvard, Vancouver, ISO, and other styles

3

Jiang, Xionghua, Zhenxing Chen, Joy Wolfram, and Zhizhou Yang. "Mechanistic Features of Nanodiamonds in the Lapping of Magnetic Heads." Scientific World Journal 2014 (2014): 1–6. http://dx.doi.org/10.1155/2014/326427.

Full text

Abstract:

Nanodiamonds, which are the main components of slurry in the precision lapping process of magnetic heads, play an important role in surface quality. This paper studies the mechanistic features of nanodiamond embedment into a Sn plate in the lapping process. This is the first study to develop mathematical models for nanodiamond embedment. Such models can predict the optimum parameters for particle embedment. From the modeling calculations, the embedded pressure satisfiesp0=3/2·W/πa2and the indentation depth satisfiesδ=k1P/HV. Calculation results reveal that the largest embedded pressure is 731.48 GPa and the critical indentation depthδis 7 nm. Atomic force microscopy (AFM), scanning electron microscopy (SEM), and Auger electron spectroscopy (AES) were used to carry out surface quality detection and analysis of the disk head. Both the formation of black spots on the surface and the removal rate have an important correlation with the size of nanodiamonds. The results demonstrate that an improved removal rate (21 nm·min−1) can be obtained with 100 nm diamonds embedded in the plate.

APA, Harvard, Vancouver, ISO, and other styles

4

Jarre, Gerald, Steffen Heyer, Elisabeth Memmel, Thomas Meinhardt, and Anke Krueger. "Synthesis of nanodiamond derivatives carrying amino functions and quantification by a modified Kaiser test." Beilstein Journal of Organic Chemistry 10 (November 20, 2014): 2729–37. http://dx.doi.org/10.3762/bjoc.10.288.

Full text

Abstract:

Nanodiamonds functionalized with different organic moieties carrying terminal amino groups have been synthesized. These include conjugates generated by Diels–Alder reactions of ortho-quinodimethanes formed in situ from pyrazine and 5,6-dihydrocyclobuta[d]pyrimidine derivatives. For the quantification of primary amino groups a modified photometric assay based on the Kaiser test has been developed and validated for different types of aminated nanodiamond. The results correspond well to values obtained by thermogravimetry. The method represents an alternative wet-chemical quantification method in cases where other techniques like elemental analysis fail due to unfavourable combustion behaviour of the analyte or other impediments.

APA, Harvard, Vancouver, ISO, and other styles

5

Perevedentseva, Elena, Nsrein Ali, Artashes Karmenyan, Ilya Skovorodkin, Renata Prunskaite-Hyyryläinen, Seppo Vainio, Chia-Liang Cheng, and Matti Kinnunen. "Optical Studies of Nanodiamond-Tissue Interaction: Skin Penetration and Localization." Materials 12, no. 22 (November 15, 2019): 3762. http://dx.doi.org/10.3390/ma12223762.

Full text

Abstract:

In this work, several optical-spectroscopic methods have been used to visualize and investigate the penetration of diamond nanoparticles (NPs) of various sizes (3–150 nm), surface structures and fluorescence properties into the animal skin in vitro. Murine skin samples have been treated with nanodiamond (ND) water suspensions and studied using optical coherence tomography (OCT), confocal and two-photon fluorescence microscopy and fluorescence lifetime imaging (FLIM). An analysis of the optical properties of the used nanodiamonds (NDs) enables the selection of optimal optical methods or their combination for the study of nanodiamond–skin interaction. Among studied NDs, particles of 100 nm in nominal size were shown to be appropriate for multimodal imaging using all three methods. All the applied NDs were able to cross the skin barrier and penetrate the different layers of the epidermis to finally arrive in the hair follicle niches. The results suggest that NDs have the potential for multifunctional applications utilizing multimodal imaging.

APA, Harvard, Vancouver, ISO, and other styles

6

Chayeuski, Vadzim, Abdelhafed Taleb, Valery Zhylinski, Andrei Kuleshov, and Roman Shtempliuk. "Preparation and Characterization of the Cr-Nanodiamonds/MoN Coatings with Performant Mechanical Properties." Coatings 12, no. 7 (July 18, 2022): 1012. http://dx.doi.org/10.3390/coatings12071012.

Full text

Abstract:

This paper presents the results of a study on the preparation and characterization of a Cr-DND/MoN detonation chromium-nanodiamond coating deposited on cemented tungsten carbide (WC–3 wt.% Co) mill blades using Arc-PVD and electrodeposition methods. The physical and mechanical characteristics of the coatings were investigated by scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDS), XRD analysis, Raman spectroscopy, micro-identification, and scratch test (evaluation of the coating adhesion). It was shown that the Cr-DND/MoN coating consists of successive layers of Cr-DND (top), Cu (middle) and MoN (bottom) with separate phases of γ-Mo2N, α-Mo, α-Cu, Cr-DND and nanodiamonds. The Cr-DND composite electrochemical coating (CEC) was deposited from the conventional chromium plating electrolyte with the addition of nanodiamonds. The copper interlayer was deposited by the Arc-PVD method on the surface of the MoN coating to improve the adhesion strength of the Cr-DND CEC. The coating showed an optimum microhardness of about 14 ± 1 GPa and good adhesion with a critical load Lc of about 93 N. In addition to the expected experimental results, the coating has high wear resistance, confirmed by scratch tests.

APA, Harvard, Vancouver, ISO, and other styles

7

Hirt, Franziska, Justus Christinck, Helmuth Hofer, Beatrice Rodiek, and Stefan Kück. "Sample fabrication and metrological characterization of single-photon emitters based on nitrogen vacancy centers in nanodiamonds." Engineering Research Express 3, no. 4 (December 1, 2021): 045038. http://dx.doi.org/10.1088/2631-8695/ac34c2.

Full text

Abstract:

Abstract Quantum metrology requires a stable single-photon emission and a high single-photon purity. Since nitrogen-vacancy (NV-) centers provide both features at room temperature, they are promising candidates for the application in this field [1, 2]. The knowledge about a suitable sample preparation technique is crucial, because the quality of the single-photon emission strongly depends on the sample purity and on the spatial resolvability of the emitters. This work presents the comparison and optimization of various sample fabrication techniques of nitrogen vacancy center doped nanodiamonds on standard cover glasses. The preparation is followed by a comparative characterization of the centers of the various samples. The sample fabrication includes the removal of contaminants on the cover glass surface. This was carried out by using peroxymonosulfuric acid (piranha solution, H2SO5) in comparison to the commercially available lye Hellmanex III (by Hellma Analytics). After cleaning the cover glasses, volumes of various nanodiamond dilutions were applied via spin coating. In subsequent steps, the nanodiamonds themselves were cleaned with peroxymonosulfuric acid, too, to remove contaminants resulting from the manufacturing process, e.g. graphite. The samples were analyzed by using a confocal laser scanning microscope with an oil immersion objective. Single-photon purity was determined by measuring the second order correlation function with a Hanbury Brown and Twiss setup. Spectral analysis revealed the presence of NV−- and NV°-centers. It was shown that a suitable cleansing method has an immense impact on single-photon emission, as was proven by a comparative characterization of differently manufactured nanodiamonds.

APA, Harvard, Vancouver, ISO, and other styles

8

Bogdanov, Denis G., Vladimir A. Plotnikov, Sergey V. Makarov, Alexander S. Bogdanov, and Aleksey A. Chepurov. "DESORPTION OF IMPURITIES FROM DETONATION NANODIAMOND DURING THE SYNTHESIS OF INTERMATALLIC COMPOUNDS OF THE Ni-Al SYSTEM." IZVESTIYA VYSSHIKH UCHEBNYKH ZAVEDENII KHIMIYA KHIMICHESKAYA TEKHNOLOGIYA 62, no. 12 (December 7, 2019): 25–32. http://dx.doi.org/10.6060/ivkkt.20196212.6021.

Full text

Abstract:

The results of modification of the impurity subsystem of detonation nanodiamonds (DND) (from the “Altai” Federal Research and Production Center (Biysk)) with active metals and mixtures of nickel and aluminum metals are presented. Samples made from three different metal-diamond mixtures were investigated: 1) 70 wt % of DND and 30 wt % of Al, 2) 50 wt % of DND and 50 wt % of mixture of nickel and aluminum in NiAl stoichiometry, 3) 70 wt % of DND and 30 wt % of mixture of nickel and aluminum in Ni3Al stoichiometry. The heating of samples of nanodiamonds in a vacuum volume (VUP-5) is accompanied by thermal desorption of volatile compounds. Analysis of the samples using differential scanning calorimetry and mass-spectrometry (DSC - on STA 409 PC Luxx NETZSCH, MS - on QMS 403 D Aeolos NETZSCH) allowed us to study the kinetics of desorption and the molecular composition of volatile compounds desorbed by heating nanodiamonds. Annealing of the charge with aluminum is accompanied by a nonmonotonic change in the weight of the sample during heating. Heating mixtures of nanodiamond with nickel and aluminum is accompanied by an almost monotonic decrease in weight. Weight loss at up to 950 °C annealing can reach 20%. When samples are heated to 950 °C, H2O (up to 200 °С), O2 (up to 60 °С), H2S (up to 700 °С), CO2 (up to 600 °С), SO2 (up to 450 °С), N2 (up to 60 °С) evaporate from the surface of the samples. Endo- and exo-effects indicate the occurrence of chemical reactions between impurities and metals. The cleaning process most actively takes place during the annealing of the metal-diamond mixture containing Ni and Al in Ni3Al stoichiometry.

APA, Harvard, Vancouver, ISO, and other styles

9

Manoj, B., Ashlin M. Raj, and George Thomas Chirayil. "Facile synthesis of preformed mixed nano-carbon structure from low rank coal." Materials Science-Poland 36, no. 1 (May 18, 2018): 14–20. http://dx.doi.org/10.1515/msp-2018-0026.

Full text

Abstract:

Abstract Coal is a natural energy resource which is mainly used for energy production via combustion. Coal has nanocrystals embedded in it, formed during the coalification process, and is an ideal precursor for nano-carbon dots and diamonds. Herein, we report a facile top-down method to synthesise nanodots and diamonds of the size of 5 nm to 10 nm from three different types of coal by simple chemical leaching. TEM analysis revealed the formation of a mixture of carbon dots, graphene layers, and quantum dots in bituminous coal and sub-bituminous coal. Raman analysis confirmed the existence of synthesized nanodiamond and nano-carbon mixed phase with defects associated with it. It is concluded that graphene quantum dots, nanodiamonds, graphene sheets and carbon dots present in coal can be extracted by simple chemical treatment. These structures can be tuned to photoluminescent material for various optoelectronic applications or energy harvesting devices like super capacitors.

APA, Harvard, Vancouver, ISO, and other styles

10

Wu, Yingke, Shuqin Cao, Md Noor A. Alam, Marco Raabe, Sandra Michel-Souzy, Zuyuan Wang, Manfred Wagner, Anna Ermakova, Jeroen J. L. M. Cornelissen, and Tanja Weil. "Fluorescent nanodiamonds encapsulated by Cowpea Chlorotic Mottle Virus (CCMV) proteins for intracellular 3D-trajectory analysis." Journal of Materials Chemistry B 9, no. 28 (2021): 5621–27. http://dx.doi.org/10.1039/d1tb00890k.

Full text

Abstract:

Fluorescent nanodiamonds are stabilized by a corona of virus capsid proteins. Intracellular diffusion studies were performed suggesting that virus-coated nanodiamonds could be attractive tools for conceptual understanding of cell-virus interactions.

APA, Harvard, Vancouver, ISO, and other styles

11

Sotoma, S., K. Akagi, S. Hosokawa, R. Igarashi, H. Tochio, Y. Harada, and M. Shirakawa. "Comprehensive and quantitative analysis for controlling the physical/chemical states and particle properties of nanodiamonds for biological applications." RSC Advances 5, no. 18 (2015): 13818–27. http://dx.doi.org/10.1039/c4ra16482b.

Full text

Abstract:

The physical/chemical states and properties of nanodiamonds subjected to thermal annealing and air oxidation, which are indispensable processes for the preparation of fluorescent nanodiamonds, were investigated.

APA, Harvard, Vancouver, ISO, and other styles

12

Fernandes-Junior, Wilson Silva, Leticia Fernanda Zaccarin, Geiser Gabriel Oliveira, Paulo Roberto de Oliveira, Cristiane Kalinke, Juliano Alves Bonacin, Jai Prakash, and Bruno Campos Janegitz. "Electrochemical Sensor Based on Nanodiamonds and Manioc Starch for Detection of Tetracycline." Journal of Sensors 2021 (March 8, 2021): 1–10. http://dx.doi.org/10.1155/2021/6622612.

Full text

Abstract:

The use of nanostructured materials is already well-known as a powerful tool in the development of electrochemical sensors. Among several immobilization strategies of nanomaterials in the development of electrochemical sensors, the use of low-cost and environmentally friendly polymeric materials is highlighted. In this context, a new nanostructured biocomposite electrode is proposed as an electrochemical sensor for the analysis and determination of tetracycline. The composite electrode consists of a modified glassy carbon electrode (GCE) with a nanodiamond-based (ND) and manioc starch biofilm (MS), called ND-MS/GCE. The proposed sensor showed better electrochemical performance in the presence of tetracycline in comparison to the unmodified electrode, which was attributed to the increase in the electroactive surface area due to the presence of nanodiamonds. A linear dynamic range from 5.0 × 10 − 6 to 1.8 × 10 − 4 mol L−1 and a limit of detection of 2.0 × 10 − 6 mol L−1 were obtained for the proposed sensor. ND-MS/GCE exhibited high repeatability and reproducibility for successive measurements with a relative standard deviation (RSD) of 6.3% and 1.5%, respectively. The proposed electrode was successfully applied for the detection of tetracycline in different kinds of water samples, presenting recoveries ranging from 86 to 112%.

APA, Harvard, Vancouver, ISO, and other styles

13

Wei, Shu Yi, Shi Jin Liu, Xiu Xia Zhang, and Li Xin Guo. "Mechanism Analysis of Field Emission for Nano-Diamond Films on Stainless Steel Substrates." Key Engineering Materials 807 (June 2019): 82–86. http://dx.doi.org/10.4028/www.scientific.net/kem.807.82.

Full text

Abstract:

In this paper, nanodiamond films (NDF) were prepared on glass substrate by screen printing with nanodiamond. The NDF was printed with two layers and treated with different surface treatments.The field emission model of nanodiamond thin film was established. Field Emission of different Ratio was studyed. The mechanism by which the field emission characteristics of nanocrystalline diamond films are improved was analyzed.

APA, Harvard, Vancouver, ISO, and other styles

14

Man'ko, T. A., I. A. Gusarova, O. M. Potapov, and Ye V. Solodkii. "Influence of nanomodifiers on the properties of carbon composites." Kosmìčna nauka ì tehnologìâ 26, no. 5 (2020): 15–21. http://dx.doi.org/10.15407/knit2020.05.015.

Full text

Abstract:

The properties of carbon composites depend on the interaction at the “filler-matrix” phase boundary. One of the most effective ways to increase interphase adhesion is the introduction of modifying nanoadditives into the matrix. By reinforcing the matrix, the mechanical properties of the carbon composite can be improved.We conducted the analysis of various nanomodifiers of the nanocarbon family, which includes fullerenes, nanotubes, graphenes, and nanodiamonds. Unique characteristics combined with moderate cost price and commercial availability distinguish well nanodiamonds from other nanoparticles. The paper demonstrates the feasibility of modifying the HUNTSMAN epoxy binder with nanodiamonds having a small and uniform size, a spherical particle shape, and an accessible outer surface. We present the technology of introducing nanodiamonds into an epoxy binder and manufacturing of carbon composites on its basis. Nanodiamonds were introduced into the light-flow solvent tetrahydrofuran under the influence of ultrasound providing a good dispersing medium. To determine the optimal content of nanomodifiers, allowing to increase interfacial adhesion, a multi-component epoxy binder HUNTSMAN based on Araldite LY556 resin, Aradur 917 hardener, and Accelerator DY 070 accelerator was investigated with nanodiamonds content of 0.26, 0.52, 2.6, 5.2, and 10.4 wt. %. We found that the introduction of nanodiamonds in an amount of 2.6 wt. % allows us to increase the hardness of materials up to 50 %. We show that introducing a minimum amount of nanomodifiers, containing up to 0.26 wt. %, into the epoxy binder gives a maximum increase in the strength characteristics of nanomodified carbon composites up to 18 %. The work was carried out under the Horizon-2020 grant agreement.

APA, Harvard, Vancouver, ISO, and other styles

15

Zabuga, Viktor Ya, Oleksandr O. Bochechka, Galyna G. Tsapyuk, Vitaliy E. Diyuk, Tetyana O. Kurylyak, and Vladyslav V. Lisnyak. "Kinetic analysis of nanodiamonds oxidation." Molecular Crystals and Liquid Crystals 673, no. 1 (September 22, 2018): 89–96. http://dx.doi.org/10.1080/15421406.2019.1578497.

Full text

APA, Harvard, Vancouver, ISO, and other styles

16

Efremov, V. P., E. I. Zakatilova, I. V. Maklashova, and N. V. Shevchenko. "Thermal Analysis of Detonation Nanodiamonds." Nanotechnologies in Russia 13, no. 1-2 (January 2018): 11–17. http://dx.doi.org/10.1134/s1995078018010044.

Full text

APA, Harvard, Vancouver, ISO, and other styles

17

Wang, Dongai, Feihui Li, Meihua Liu, Wengang Zhang, Xiaohan Yu, and Wei Da. "Effect of Nanodiamond Content in the Plating Solution on the Corrosion Resistance of Nickel–Nanodiamond Composite Coatings Prepared on Annealed 45 Carbon Steel." Coatings 12, no. 10 (October 15, 2022): 1558. http://dx.doi.org/10.3390/coatings12101558.

Full text

Abstract:

A nickel-nanodiamond composite coating was prepared on the surface of annealed 45 carbon steel by double-pulse electrodeposition. The effect of nanodiamond particle content on the surface morphology, grain size and wear and corrosion resistance of the composite coating were investigated. According to the analysis of the test results of X-ray diffractometry and scanning electron microscopy, it was found that the cathodic polarization of the electrodeposition process was enhanced after the addition of nanodiamond particles to the Watts nickel plating solution. The positively charged nanodiamond particles on the surface facilitate the reduction reaction at the cathode. Nanodiamond particles provide crystalline growth sites for the non-spontaneous nucleation of nickel atoms. As the addition of nanodiamond particles increases, the diffusely distributed nanodiamond particles are able to attract more nickel ions to deposit nuclei, and its fine crystallization effect increases, resulting in improved wear resistance and corrosion resistance of the composite plating. Among the results, the polarization potential was the smallest when the nanodiamond content in the plating solution was 10 g/L. The surface of the prepared nickel-nanodiamond composite coating was relatively flat and smooth, with good density and a uniform grain size distribution, and the content of element C on the surface of the composite coating was the largest, reaching 1.99%.

APA, Harvard, Vancouver, ISO, and other styles

18

Jiang, Xionghua. "Using a Novel Floating Grinding Process to Improve the Surface Roughness Parameter of a Magnetic Head." Nanomaterials 12, no. 16 (August 12, 2022): 2763. http://dx.doi.org/10.3390/nano12162763.

Full text

Abstract:

This work concentrated on the improvement of the surface roughness of a magnetic head, through the use of an ultrafine nanodiamond slurry, and a novel floating grinding process, which optimize different experimental factors required for the fine grinding of a magnetic head. The preparation of the grinding plate was confirmed by the observation of the surface change, depth detection, and flatness after ultrafine nanodiamonds were embedded into it by a Keyence high-power microscope at a 20 K magnification. The flatness was measured by a TOTO instrument. The optimum conditions were found to be a pit ratio reach of 30:70 and a plate flatness (average) of 1.8 μm. The rotation speed and vibration frequency were 0.3 and 10 rpm, respectively, for the grinding process. The morphology, size, and elemental composition of blackspots were investigated by SEM, AES, AFM, and transmission electron microscopy (TEM) analysis, which showed that the diameter of the diamonds in the slurry was important for grinding surface improvement. A novel method was proposed in this study to fine grind a magnetic head using a small-sized diamond slurry (100 nm) in conjunction with a novel float lapping method. Comparison experiments were performed under both normal conditions and improved conditions. The results show that by using the novel float lapping method with a small-sized diamond slurry, the minimum roughness was obtained. The finest roughness obtained for the slider surface reached 0.165 nm without blackspots or scratches.

APA, Harvard, Vancouver, ISO, and other styles

19

Mangal, Utkarsh, Ji-Young Seo, Jaehun Yu, Jae-Sung Kwon, and Sung-Hwan Choi. "Incorporating Aminated Nanodiamonds to Improve the Mechanical Properties of 3D-Printed Resin-Based Biomedical Appliances." Nanomaterials 10, no. 5 (April 26, 2020): 827. http://dx.doi.org/10.3390/nano10050827.

Full text

Abstract:

The creation of clinically patient-specific 3D-printed biomedical appliances that can withstand the physical stresses of the complex biological environment is an important objective. To that end, this study aimed to evaluate the efficacy of aminated nanodiamonds (A-NDs) as nanofillers in biological-grade acrylate-based 3D-printed materials. Solution-based mixing was used to incorporate 0.1 wt% purified nanodiamond (NDs) and A-NDs into UV-polymerized poly(methyl methacrylate) (PMMA). The ND and A-ND nanocomposites showed significantly lower water contact angles (p < 0.001) and solubilities (p < 0.05) compared to those of the control. Both nanocomposites showed markedly improved mechanical properties, with the A-ND-containing nanocomposite showing a statistically significant increase in the flexural strength (p < 0.001), elastic modulus (p < 0.01), and impact strength (p < 0.001) compared to the control and ND-containing groups. The Vickers hardness and wear-resistance values of the A-ND-incorporated material were significantly higher (p < 0.001) than those of the control and were comparable to the values observed for the ND-containing group. In addition, trueness analysis was used to verify that 3D-printed orthodontic brackets prepared with the A-ND- and ND-nanocomposites exhibited no significant differences in accuracy. Hence, we conclude that the successful incorporation of 0.1 wt% A-ND in UV-polymerized PMMA resin significantly improves the mechanical properties of the resin for the additive manufacturing of precisive 3D-printed biomedical appliances.

APA, Harvard, Vancouver, ISO, and other styles

20

Thalassinos, Giannis, Alastair Stacey, Nikolai Dontschuk, Billy J. Murdoch, Edwin Mayes, Hugues A. Girard, Ibrahim M. Abdullahi, et al. "Fluorescence and Physico-Chemical Properties of Hydrogenated Detonation Nanodiamonds." C — Journal of Carbon Research 6, no. 1 (February 7, 2020): 7. http://dx.doi.org/10.3390/c6010007.

Full text

Abstract:

Hydrogenated detonation nanodiamonds are of great interest for emerging applications in areas from biology and medicine to lubrication. Here, we compare the two main hydrogenation techniques—annealing in hydrogen and plasma-assisted hydrogenation—for the creation of detonation nanodiamonds with a hydrogen terminated surface from the same starting material. Synchrotron-based soft X-ray spectroscopy, infrared absorption spectroscopy, and electron energy loss spectroscopy were employed to quantify diamond and non-diamond carbon contents and determine the surface chemistries of all samples. Dynamic light scattering was used to study the particles’ colloidal properties in water. For the first time, steady-state and time-resolved fluorescence spectroscopy analysis at temperatures from room temperature down to 10 K was performed to investigate the particles’ fluorescence properties. Our results show that both hydrogenation techniques produce hydrogenated detonation nanodiamonds with overall similar physico-chemical and fluorescence properties.

APA, Harvard, Vancouver, ISO, and other styles

21

Wang, Dongai, Meihua Liu, Yuanmin Zhu, and Feihui Li. "Influence of Double-Pulse Electrodeposition Parameters on the Performance of Nickel/Nanodiamond Composite Coatings." Coatings 11, no. 9 (September 3, 2021): 1068. http://dx.doi.org/10.3390/coatings11091068.

Full text

Abstract:

In this study, using 45# carbon steel as the substrate, a first experimental analysis was carried out on the polarisation behaviour of different component wattage plating solutions in order to determine the reasonable content of nanodiamond particles in a nickel/nanodiamond composite plating solution. Secondly, the effect of double-pulse forward and reverse duty cycle and reverse working time on the performance of nickel/nanodiamond composite plating was then investigated by testing the thickness, hardness and surface roughness of the composite plating and observing the surface micromorphology. The experimental results show that, when the content of nanodiamond particles in the plating solution is 5 g/L, the anti-pulse working time, forward and reverse pulse duty cycle of the double-pulse plating parameters are 20, 0.3 and 0.2 ms, respectively, and the composite plating layer prepared by double pulse has good comprehensive performance. This research work provides technical support for the optimisation of process parameters for the preparation of nickel/nanodiamond composite coatings by double-pulse electrodeposition.

APA, Harvard, Vancouver, ISO, and other styles

22

Freitas, Maria, André Carvalho, Henri P. A. Nouws, and Cristina Delerue-Matos. "Tracking Arachis hypogaea Allergen in Pre-Packaged Foodstuff: A Nanodiamond-Based Electrochemical Biosensing Approach." Biosensors 12, no. 6 (June 18, 2022): 429. http://dx.doi.org/10.3390/bios12060429.

Full text

Abstract:

The present work reports a nanodiamond-based voltammetric immunosensing platform for the analysis of a food allergen (Ara h 1) present in peanuts (Arachis hypogaea). The possibility of the usage of nanodiamonds (d = 11.2 ± 0.9 nm) on screen-printed carbon electrodes (SPCE/ND) in a single-use two-monoclonal antibody sandwich assay was studied. An enhanced electroactive area (~18%) was obtained and the biomolecule binding ability was improved when the 3D carbon-based nanomaterial was used. The antibody-antigen interaction was recognized through the combination of alkaline phosphatase with 3-indoxyl phosphate and silver ions. Linear Sweep Voltammetry (LSV) was applied for fast signal acquisition and scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS) support the voltammetric approach and confirm the presence of silver particles on the electrode surface. The proposed immunosensor provided a low limit of detection (0.78 ng·mL−1) and highly precise (RSD < 7.5%) and accurate results. Quantification of Ara h 1 in commercial foodstuffs (e.g., crackers, cookies, protein bars) that refer to the presence of peanuts (even traces) on the product label was successfully achieved. The obtained data were in accordance with recovery results (peanut addition, %) and the foodstuff label. Products with the preventive indication “may contain traces” revealed the presence of peanuts lower than 0.1% (m/m). The method’s results were validated by comparison with an enzyme-linked immunosorbent assay. This allows confident information about the presence of allergens (even at trace levels) that leads to profitable conditions for both industry and consumers.

APA, Harvard, Vancouver, ISO, and other styles

23

Wei, Qi Long, and Yu Tang Meng. "Study on Measuring Particle Size Distribution of a Nanodiamond Powder." Advanced Materials Research 631-632 (January 2013): 73–77. http://dx.doi.org/10.4028/www.scientific.net/amr.631-632.73.

Full text

Abstract:

Particle size distribution (PSD) of a nanodiamond powder in a high concentration suspension was measured by a new dynamic light scattering (DLS) technique based on the Doppler frequency shifting effect. Influence of dispersing pre-treatment, distribution bases and materials’ properties on DLS results was analyzed, and PSD results were validated by TEM analysis. It was found that the optimized ultrasonic dispersing time of the diamond powder in a sodium hexametaphosphate (SHP) solution was about 5 minutes. And median sizes of the nanodiamond powder were 115.6 nm, 53.0 nm and 32.6 nm, based on light intensity, volume and number respectively. PSD results of the nanodiamond based on number accorded well with results from TEM analysis. And PSD results were affected hardly by refractive indices of the diamond and the dispersing medium, while they were affected markedly by viscosity of the medium. It is concluded that this new DLS technique could measure PSD of the nanodiamond powder in high concentration suspensions which has been dispersed properly.

APA, Harvard, Vancouver, ISO, and other styles

24

Liu, Chang, Xingjie Hu, Xiaojiao Li, Yanfeng Zhou, Hui Wang, Chunhai Fan, and Haiyun Song. "Reprogramming of cancer invasiveness and macrophage education via a nanostructured antagonist of the TGFβ receptor." Materials Horizons 6, no. 8 (2019): 1675–81. http://dx.doi.org/10.1039/c9mh00388f.

Full text

Abstract:

An interactome network analysis reveals functional intervention of TGFβ signaling by nanodiamonds, which diminishes cancer metastasis, tumor-associated macrophage recruitment and M2 macrophage polarization.

APA, Harvard, Vancouver, ISO, and other styles

25

Knizhnik, Andrey A., Yulia G. Polynskaya, Alexander S. Sinitsa, Nikita M. Kuznetsov, Sergey I. Belousov, Sergei N. Chvalun, and Boris V. Potapkin. "Analysis of structural organization and interaction mechanisms of detonation nanodiamond particles in hydrosols." Physical Chemistry Chemical Physics 23, no. 1 (2021): 674–82. http://dx.doi.org/10.1039/d0cp05533f.

Full text

APA, Harvard, Vancouver, ISO, and other styles

26

Landeros-Martínez, Linda-Lucila, David Chavez-Flores, Erasmo Orrantia-Borunda, and Norma Flores-Holguin. "Construction of a Nanodiamond–Tamoxifen Complex as a Breast Cancer Drug Delivery Vehicle." Journal of Nanomaterials 2016 (2016): 1–9. http://dx.doi.org/10.1155/2016/2682105.

Full text

Abstract:

According to the World Health Organization, breast cancer represents 16% of all cancer cases in women and is the second most common cancer. In the past decades, the mortality among patients with metastasis breast cancer has been reduced significantly via drug delivery by means of nanodiamond therapies, which are both biocompatible and scalable. In this study, we determined a theoretical pathway for the construction of a nanodiamond–tamoxifen complex that will act as a drug delivery vehicle for targeting tumor tissues of breast cancer. The tamoxifen pharmacophore was defined and the binding zone was identified for the electrostatic interaction between tamoxifen and a functionalized site of a nanodiamond particle allowing for attachment of the payload (this drug) to the surface of the nanodiamond particle. In addition, an analysis of the intermolecular interaction between the nanodiamond and tamoxifen was conducted, showing three hydrogen bonds complying fully with Lipinski’s rule of five, which states that a compound should have five or fewer hydrogen bonds to be permeating and easily absorbed by the body (qualitative prediction). All calculations were performed using the conceptual Density Functional Theory with the M06 functional and the basis set 6-31G(d). The solvent effect has been taken into account by an implicit model, the conductor like polarizable continuum model.

APA, Harvard, Vancouver, ISO, and other styles

27

Li, Hong, Yi Wang, Lei Zhang, Haojie Lu, Zhongjun Zhou, Liming Wei, and Pengyuan Yang. "Facile synthesis of novel magnetic silica nanoparticles functionalized with layer-by-layer detonation nanodiamonds for secretome study." Analyst 140, no. 23 (2015): 7886–95. http://dx.doi.org/10.1039/c5an01432h.

Full text

Abstract:

A novel approach for fast and efficient specific enrichment of low abundance peptides and proteins in secretome analysis was developed by using novel magnetic silica nanoparticles functionalized with layer-by-layer detonation nanodiamonds (dNDs).

APA, Harvard, Vancouver, ISO, and other styles

28

LYON, Ian C. "MALDI analysis of presolar nanodiamonds: Mass spectrometric determination of the mass distribution of nanodiamonds from meteorites and a technique to manipulate individual nanodiamonds." Meteoritics & Planetary Science 40, no. 7 (July 2005): 981–87. http://dx.doi.org/10.1111/j.1945-5100.2005.tb00168.x.

Full text

APA, Harvard, Vancouver, ISO, and other styles

29

Volkov, Dmitry S., Petr K. Krivoshein, and Mikhail A. Proskurnin. "Detonation Nanodiamonds: A Comparison Study by Photoacoustic, Diffuse Reflectance, and Attenuated Total Reflection FTIR Spectroscopies." Nanomaterials 10, no. 12 (December 13, 2020): 2501. http://dx.doi.org/10.3390/nano10122501.

Full text

Abstract:

The qualitative analysis of nanodiamonds by FTIR spectrometry as photoacoustic (FTIR–PAS), diffuse-reflectance (DRIFT), and attenuated total reflection (ATR) modalities was evaluated for rapid and nondestructive analysis and comparison of nanodiamonds. The reproducibility and signal-gathering depth of spectra was compared. The assignment of characteristic bands showed that only six groups of bands were present in spectra of all the modalities with appropriate sensitivity: 1760 (C=O stretch, isolated carboxyl groups); 1640–1632 (H–O–H bend, liquid water); 1400–1370 (non-carboxyl C–O–H in-plane bend and CH2 deformation); 1103 (non-carboxyl C–O stretch); 1060 (in-plane C–H bend, non-aromatic hydrocarbons and carbohydrates); 940 cm−1 (out-of-plane carboxyl C–O–H bend). DRIFT provides the maximum number of bands and is capable of measuring hydrogen-bonded bands and CHx groups. ATR provides the good sensitivity for water and C–H/C–C bands in the range 2000–400 cm−1. FTIR–PAS reveals less bands than DRIFT but more intense bands than ATR–FTIR and shows the maximum sensitivity for absorption bands that do not appear in ATR-IR spectra and are expedient for supporting either DRIFT or FTIR–PAS along with depth-profiling. Thus, all three modalities are required for the full characterization of nanodiamonds surface functional groups.

APA, Harvard, Vancouver, ISO, and other styles

30

GENJO, Takuya, Shingo SOTOMA, Ryotaro TANABE, Ryuji IGARASHI, and Masahiro SHIRAKAWA. "A Nanodiamond-peptide Bioconjugate for Fluorescence and ODMR Microscopy of a Single Actin Filament." Analytical Sciences 32, no. 11 (2016): 1165–70. http://dx.doi.org/10.2116/analsci.32.1165.

Full text

APA, Harvard, Vancouver, ISO, and other styles

31

Tóth, Sára, László Himics, and Margit Koós. "Nickel-Silicon Related Color Center Formed in Nanodiamond Grains under CVD Growth." Journal of Nanoscience 2015 (December 15, 2015): 1–6. http://dx.doi.org/10.1155/2015/282967.

Full text

Abstract:

Formation of optical centers in nanodiamond grains with narrow, near-infrared emission at room temperature is one of the most important challenges nowadays. Our aim was to form a metal-related color center through the CVD growth process of nanodiamond. Previously undocumented photoluminescence (PL) system with 865 nm zero-phonon line (ZPL) and 2 nm full width at half maximum (FWHM) was successfully created in nanodiamond grains. According to the detailed analysis of the spectral features of the ZPL and quasilocal modes of the vibronic sideband, a complex center containing Ni and Si atoms could be accounted for these PL features. The inclusion of Ni and Si impurity atoms in the complex optical center was strengthened by micro-Raman spectroscopy performed in the frequency range due to quasilocal vibrations of the vibronic sideband.

APA, Harvard, Vancouver, ISO, and other styles

32

Luzanov, A. V. "Excited state structural analysis (ESSA) for correlated states of spin-flip type: application to electronic excitations in nanodiamonds with defects." Functional materials 23, no. 1 (March 15, 2016): 63–70. http://dx.doi.org/10.15407/fm23.01.063.

Full text

APA, Harvard, Vancouver, ISO, and other styles

33

Panich, Alexander M. "Universal Dependence of Nuclear Spin Relaxation on the Concentration of Paramagnetic Centers in Nano- and Microdiamonds." Materials 15, no. 16 (August 21, 2022): 5774. http://dx.doi.org/10.3390/ma15165774.

Full text

Abstract:

An analysis of our data on 1H and 13C spin–lattice and spin–spin relaxation times and rates in aqueous suspensions of purified nanodiamonds produced by detonation technique (DNDs), DNDs with grafted paramagnetic ions, and micro- and nanodiamonds produced by milling bulk high-temperature high-pressure diamonds is presented. It has been established that in all the studied materials, the relaxation rates depend linearly on the concentration of diamond particles in suspensions, the concentration of grafted paramagnetic ions, and surface paramagnetic defects produced by milling, while the relaxation times exhibit a hyperbolic dependence on the concentration of paramagnetic centers. This is a universal law that is valid for suspensions, gels, and solids. The results obtained will expand the understanding of the properties of nano- and microdiamonds and will be useful for their application in quantum computing, spintronics, nanophotonics, and biomedicine.

APA, Harvard, Vancouver, ISO, and other styles

34

Hamilton, T., R. G. Wilks, M. V. Yablonskikh, Q. Yang, M. N. Foursa, A. Hirose, V. N. Vasilets, and A. Moewes. "Determining the sp2/sp3 bonding concentrations of carbon films using X-ray absorption spectroscopy." Canadian Journal of Physics 86, no. 12 (December 1, 2008): 1401–7. http://dx.doi.org/10.1139/p08-063.

Full text

Abstract:

The sp2 bonding concentrations of nitrogen-doped amorphous carbon samples and nanodiamond films were determined from their soft X-ray absorption spectra. The amorphous carbon (a-C) samples were deposited under atmospheres of varying nitrogen concentrations onto polytetrafluoroethylene (PTFE) polymer and silicon substrates. The nanodiamond films were synthesized on silicon substrates in a CH4/H2 gas mixture by microwave plasma chemical vapour deposition. The sp2 bonding concentrations in the a-C films (deposited on PTFE substrates) increase from 74% to 93% as nitrogen doping increases, with a step-like increase in sp2 fraction when nitrogen concentrations in the films exceed 27%. The a-C films on silicon substrates display the same trend of increasing sp2 concentration as a function of greater nitrogen concentration. Nanodiamond deposition conditions, such as bias voltage and methane concentration, affect the purity of the film. Our analysis reveals sp2 bonding concentrations in these samples ranging from a few percent to 11%.PACS Nos.: 78.70.Dm, 61.10.Ht, 61.46.+w, 81.05.Uw

APA, Harvard, Vancouver, ISO, and other styles

35

Кудряшова, О. Б., Е. А. Петров, and А. А. Ветрова. "EXCESSIVE ENERGY OF DETONATION NANODIAMONDS." Южно-Сибирский научный вестник, no. 3(37) (June 30, 2021): 58–62. http://dx.doi.org/10.25699/sssb.2021.37.3.014.

Full text

Abstract:

Алмазы детонационного синтеза (ДНА) отличаются набором уникальных свойств, связанных с существенно неравновесными условиями их получения. Исследование их свойств продолжает оставаться актуальным в последние годы. Наноалмазы находят применение в полировальных составах, при модификации каучуков, резин, полимеров, металлов, создании новых композиционных материалов, в качестве добавок к топливу, адсорбентов и катализаторов, в биологии и в медицине. Интерес представляет энергетическая насыщенность наноалмазов. В данной работе проведено теоретическое и экспериментальное исследование избыточной энергии алмазов детонационного синтеза. Доказано, что ДНА обладают избыточной энергией по сравнению с природными и синтетическими алмазами. Рассмотрены возможные источники возникновения избыточной энергии. Исследованы образцы ДНА, полученные в различных условиях синтеза. На основе данных по термогравиметрическому анализу образцов ДНА представлены результаты анализа избыточной энергии образцов и ее зависимости от площади удельной поверхности частиц. Площадь удельной поверхности порошков получена методом БЭТ. Установлено, что чем больше поверхность частиц, тем больше тепла затрачено на её получение и выделилось при сжигании. Однако зависимость избыточной энергии от площади удельной поверхности частиц обратная. Экспериментально полученные нами величины плотности избыточной энергии на 1-2 порядка выше теоретически полученных значений для природных алмазов и для наноалмазов, что подтверждает наличие большой избыточной энергии ДНА. Такое свойство детонационных наноалмазов может найти применение в новых технологиях, в частности, при использовании наноалмазов в роли сорбентов. Detonation synthesis diamonds (DNDs) are distinguished by a set of unique properties associated with substantially nonequilibrium conditions for their production. The study of their properties continues to be relevant in recent years. Nanodiamonds are used in polishing compositions, in the modification of rubbers, polymers, metals, the creation of new composite materials, as additives to fuel, adsorbents and catalysts, in biology and medicine. The energy saturation of nanodiamonds is of interest. In this work, a theoretical and experimental study of the excessive energy of detonation synthesis diamonds is carried out. It has been proven that DNDs have excessive energy in comparison with natural and synthetic diamonds. Possible sources of excess energy are considered. Samples of DND obtained under various synthesis conditions have been investigated. Based on the data on thermogravimetric analysis of DND samples, the results of the analysis of the excessive energy of the samples and their dependence on the specific surface area of the particles are presented. The specific surface area of the powders was obtained by the BET method. It was found that the larger the surface of the particles, the more heat is spent on its production and released during combustion. However, the dependence of the excessive energy on the specific surface area of the particles is inverse. The experimentally obtained values of the excessive energy density are 1–2 orders of magnitude higher than the theoretically obtained values for natural diamonds and for nanodiamonds, which confirms the presence of a large excess excessive of DND. This property of detonation nanodiamonds can find application in new technologies, in particular, when nanodiamonds are used as sorbents.

APA, Harvard, Vancouver, ISO, and other styles

36

Garg, Sweta, Ashish Garg, Nitendra K. Sahu, and Awesh K. Yadav. "Synthesis and Characterization of Nanodiamond-Doxorubicin (Dox) Conjugate for Effective Delivery against MCF-7 Cell Lines." Journal of Drug Delivery and Therapeutics 9, no. 4-s (August 23, 2019): 589–94. http://dx.doi.org/10.22270/jddt.v9i4-s.3400.

Full text

Abstract:

In this work, we have introduced a carbon nanomaterial (nanodiamond), to bind with anticancer drug doxorubicin (DOX) with via amide bond conjugation for cancer drug delivery and therapy. Nanodiamond (ND) was initially carboxylated by the surface modification along the treatment with strong alkaline solution (H2SO4:HNO3) and then activated the carboxyl moiety of ND with the addition of EDC. Anticancer drugs were bound to the ND through a succession of chemical modifications by adipic acid dihydrazide (ADH). The ND-Drug conjugate was analyzed by Nuclear Magnetic Resonance (1H-NMR) Spectroscopy, Fourier Transform Infrared (FTIR) Spectroscopy and Mass Spectroscopy (MS), Atomic Force Microscopy (AFM), Particle size, Zeta potential, Drug release, SRB assay against MCF-7 cells, and DNA fragmentation. Spectroscopic analysis confirms the conjugation of nanodiamond with different anticancer drug. AFM photomicrograph represents the surface morphological features of ND-DOX conjugates. In- vitro investigation showed that ND-DOX conjugates have slow and sustained drug release characteristics. In-vitro cytotoxicity studies, an enormous cytotoxic potential of ND-Drug conjugates were showed against cancer cell line. Above all findings were suggested that the ND-DOX conjugates may be a potential inhibitor of MCF-7 cancer cells to act as a drug candidate. According to all these data it can be confirm that the ND-DOX conjugates could be an effective agent for drug delivery and could be promising in future for tumor targeting strategy. Keywords: Nanodiamond, Sustained Release, Drug Delivery, Cytotoxicity, Conjugates

APA, Harvard, Vancouver, ISO, and other styles

37

Kwon, S. Joon, and Jae-Gwan Park. "Theoretical analysis of the graphitization of a nanodiamond." Journal of Physics: Condensed Matter 19, no. 38 (August 31, 2007): 386215. http://dx.doi.org/10.1088/0953-8984/19/38/386215.

Full text

APA, Harvard, Vancouver, ISO, and other styles

38

Efremov, V. P., and E. I. Zakatilova. "The analysis of thermal stability of detonation nanodiamond." Journal of Physics: Conference Series 774 (November 2016): 012014. http://dx.doi.org/10.1088/1742-6596/774/1/012014.

Full text

APA, Harvard, Vancouver, ISO, and other styles

39

Zou, Q., M. Z. Wang, and Y. G. Li. "Analysis of the nanodiamond particle fabricated by detonation." Journal of Experimental Nanoscience 5, no. 4 (August 2010): 319–28. http://dx.doi.org/10.1080/17458080903531021.

Full text

APA, Harvard, Vancouver, ISO, and other styles

40

SAKURAI, Hiroki, Noboru EBIHARA, Eiji OSAWA, Makoto TAKAHASHI, Masanori FUJINAMI, and Koichi OGUMA. "Adsorption Characteristics of a Nanodiamond for Oxoacid Anions and Their Application to the Selective Preconcentration of Tungstate in Water Samples." Analytical Sciences 22, no. 3 (2006): 357–62. http://dx.doi.org/10.2116/analsci.22.357.

Full text

APA, Harvard, Vancouver, ISO, and other styles

41

Speranza, Giorgio. "Characterization of Carbon Nanostructures by Photoelectron Spectroscopies." Materials 15, no. 13 (June 23, 2022): 4434. http://dx.doi.org/10.3390/ma15134434.

Full text

Abstract:

Recently, the scientific community experienced two revolutionary events. The first was the synthesis of single-layer graphene, which boosted research in many different areas. The second was the advent of quantum technologies with the promise to become pervasive in several aspects of everyday life. In this respect, diamonds and nanodiamonds are among the most promising materials to develop quantum devices. Graphene and nanodiamonds can be coupled with other carbon nanostructures to enhance specific properties or be properly functionalized to tune their quantum response. This contribution briefly explores photoelectron spectroscopies and, in particular, X-ray photoelectron spectroscopy (XPS) and then turns to the present applications of this technique for characterizing carbon nanomaterials. XPS is a qualitative and quantitative chemical analysis technique. It is surface-sensitive due to its limited sampling depth, which confines the analysis only to the outer few top-layers of the material surface. This enables researchers to understand the surface composition of the sample and how the chemistry influences its interaction with the environment. Although the chemical analysis remains the main information provided by XPS, modern instruments couple this information with spatial resolution and mapping or with the possibility to analyze the material in operando conditions at nearly atmospheric pressures. Examples of the application of photoelectron spectroscopies to the characterization of carbon nanostructures will be reviewed to present the potentialities of these techniques.

APA, Harvard, Vancouver, ISO, and other styles

42

Volkov, Dmitry S., Mikhail A. Proskurnin, and Mikhail V. Korobov. "Elemental analysis of nanodiamonds by inductively-coupled plasma atomic emission spectroscopy." Carbon 74 (August 2014): 1–13. http://dx.doi.org/10.1016/j.carbon.2014.02.072.

Full text

APA, Harvard, Vancouver, ISO, and other styles

43

Yakovlev, R. Yu, N. N. Dogadkin, I. I. Kulakova, G. V. Lisichkin, N. B. Leonidov, and V. P. Kolotov. "Determination of impurities in detonation nanodiamonds by gamma activation analysis method." Diamond and Related Materials 55 (May 2015): 77–86. http://dx.doi.org/10.1016/j.diamond.2015.03.010.

Full text

APA, Harvard, Vancouver, ISO, and other styles

44

Ott, U., A. Besmehn, K. Farouqi, O. Hallmann, P. Hoppe, K. L. Kratz, K. Melber, and A. Wallner. "New Attempts to Understand Nanodiamond Stardust." Publications of the Astronomical Society of Australia 29, no. 2 (2012): 90–97. http://dx.doi.org/10.1071/as11064.

Full text

Abstract:

AbstractWe report on a concerted effort aimed at understanding the origin and history of the pre-solar nanodiamonds in meteorites including the astrophysical sources of the observed isotopic abundance signatures. This includes measurement of light elements by secondary ion mass spectrometry (SIMS), analysis of additional heavy trace elements by accelerator mass spectrometry (AMS) and dynamic calculations of r-process nucleosynthesis with updated nuclear properties. Results obtained indicate that: (i) there is no evidence for the former presence of now-extinct 26Al and 44Ti in our diamond samples other than what can be attributed to silicon carbide and other ‘impurities’, and this does not offer support for a supernova (SN) origin but neither does it negate it; (ii) analysis by AMS of platinum in ‘bulk diamond’ yields an overabundance of r-only 198Pt that at face value seems more consistent with the neutron burst than with the separation model for the origin of heavy trace elements in the diamonds, although this conclusion is not firm given analytical uncertainties; (iii) if the Xe–H pattern was established by an unadulterated r-process, it must have been a strong variant of the main r-process, which possibly could also account for the new observations in platinum.

APA, Harvard, Vancouver, ISO, and other styles

45

Kabir, Imrana I., John C. Osborn, Weijian Lu, Jitendra P. Mata, Christine Rehm, Guan H. Yeoh, and Tunay Ersez. "Structure evolution of nanodiamond aggregates: a SANS and USANS study." Journal of Applied Crystallography 55, no. 2 (March 25, 2022): 353–61. http://dx.doi.org/10.1107/s1600576722002084.

Full text

Abstract:

Ultra-small-angle neutron scattering (USANS) and small-angle neutron scattering (SANS) measurements, covering length scales from micrometres to nanometres, were made to investigate the structure of nanodiamonds (NDs) and their suspensions. These nanodiamonds were produced by two different techniques, namely by the detonation method and by the laser ablation of a carbon–hydrocarbon mixture. The (U)SANS results indicated the presence of structures four orders of magnitude larger than the dimensions of a single ND particle, consisting of aggregations of ND particles. This aggregation of the ND particles was studied by employing the contrast variation technique. Two different solvents, namely H2O and dimethyl sulfoxide (and their deuterated counterparts), were used to understand the role of hydrogen in the shape and size of the aggregates. The analysis of experimental data from SANS measurements also reveals the ND particles to have an ellipsoidal structure. Using a defined shape model and the SANS contrast variation technique, it was possible to characterize the non-diamond outer shell of the particles and determine the outer layer thickness. This clarification of the structure of the NDs will allow better preparation of suspensions/samples for various applications. Understanding the structure of NDs at multiple length scales also provides crucial knowledge of particle–particle interaction and its effect on the aggregation structures.

APA, Harvard, Vancouver, ISO, and other styles

46

Streletskiy, Oleg, Elena Perevedentseva, Ilya Zavidovskiy, Artashes Karmenyan, Vladimir Sychev, Vera Sadykova, Anastasia Kuvarina, and Chia-Liang Cheng. "Amorphous Carbon Films with Embedded Well-Dispersed Nanodiamonds: Plasmon-Enhanced Analysis and Possible Antimicrobial Applications." Magnetochemistry 8, no. 12 (November 26, 2022): 171. http://dx.doi.org/10.3390/magnetochemistry8120171.

Full text

Abstract:

An amorphous carbon film with embedded detonation nanodiamond (DND) particles (a-C:ND) was produced by magnetron sputtering of nanodiamond powder. An Ag film was deposited on the carbon structure by radiofrequency magnetron sputtering. The silver film was irradiated with a 150 eV Ar+ to form plasmonic-active nanoparticles (NP) on the surface of the a-C:ND. The structure of the obtained a-C:ND and a-C:ND/Ag structures were studied by scanning and transmission electron microscopy, electron energy-loss spectroscopy, UV–Visible absorption spectroscopy, Raman spectroscopy, and fluorescence lifetime imaging at two-photon excitation. The analysis revealed 76% of sp3-carbon and a good dispersion of diamond nanoparticles in the a-C. Surface-enhanced Raman scattering (SERS) was applied to investigate the a-C:ND/Ag structure, allowing for the observation of SERS from the sp2-carbon species and the absence of significant a-C:ND damage after Ar+ irradiation of the Ag overlayer. A plasmonic-metal-enhanced luminescence was observed at one- and two-photon excitations, revealing a two- to five-fold intensity increase. The activity of the used DNDs was tested using the agar diffusion method and observed against the bacteria of Bacillus subtilis, Staphylococcus aureus, and Escherichia coli and the fungi of Aspergillus niger, Aspergillus fumigatus, and the yeast of Candida albicans, showing DND activity against all the test strains of fungi.

APA, Harvard, Vancouver, ISO, and other styles

47

Lugovski, A. A., G. A. Gusakov, M. P. Samtsov, V. A. Parhomenko, and S. V. Adamchyk. "Modified ultradispersed diamonds based catalytic systems in cross-coupling reactions." Proceedings of the National Academy of Sciences of Belarus, Chemical Series 57, no. 1 (February 10, 2021): 7–14. http://dx.doi.org/10.29235/1561-8331-2021-57-1-7-14.

Full text

Abstract:

Methods for preparation of nanocomposites of modified detonation nanodiamonds (DND) with metallic palladium have been developed and their catalytic activity in the Suzuki-Miyaura cross-coupling reaction in various reaction media has been studied. Methods for the regeneration of palladium-containing nanocomposites from the reaction mixture have been developed. The high catalytic activity of nanocomposites is confirmed by kinetic analysis based on the results of chromatographic analysis of the reaction mixture and is comparable to the literature data about similar catalytic systems. Regenerated nanocomposites showed the retention of catalytic activity for 3 consecutive cross-coupling cycles on model systems.

APA, Harvard, Vancouver, ISO, and other styles

48

Kozlovskiy, Artem L., Indira Tleulessova, Daryn B. Borgekov, Vladimir V. Uglov, Viktor M. Anishchik, Maxim V. Zdorovets, and Dmitriy I. Shlimas. "Study of the Reinforcement Effect in (0.5–x)TeO2–0.2WO3–0.1Bi2O3–0.1MoO3–0.1SiO2–xCNDs Glasses Doped with Carbon Nanodiamonds." Nanomaterials 12, no. 19 (September 23, 2022): 3310. http://dx.doi.org/10.3390/nano12193310.

Full text

Abstract:

The purpose of this study is to examine the influence of carbon nanodiamonds on the reinforcement and hardening of telluride glasses, as well as to establish the dependence of the strengthening properties and optical characteristics of glasses on CND concentration. According to X-ray diffraction data, the synthesized glasses have an amorphous structure despite the addition of CNDs, and at high concentrations of CNDs, reflections characteristic of small crystalline particles of carbon nanodiamonds are observed. An analysis of the strength properties of glasses depending on the concentration of the CND dopant showed that an increase in the CND concentration to 0.10–0.15 mol. leads to an increase in hardness by 33–50% in comparison with undoped samples. The studies carried out to determine the resistance to external influences found that doping leads to an increase in the resistance of strength characteristics against destruction and embrittlement, and in the case of high concentrations, the change in strength properties is minimal, which indicates a high ceramic stability degree. The study of the radiation resistance of synthesized glasses found that the addition of CNDs leads to an increase in resistance to radiation damage when irradiated with gamma rays, while also maintaining resistance to high radiation doses. The study of the shielding characteristics found that the addition of CNDs is most effective in shielding gamma rays with energies of 130–660 MeV.

APA, Harvard, Vancouver, ISO, and other styles

49

Stroud, Rhonda M. "Aberration-Corrected STEM Analysis of Impurities in Cosmic Nanodiamonds and Synthetic Analogs." Microscopy and Microanalysis 25, S2 (August 2019): 1736–37. http://dx.doi.org/10.1017/s1431927619009413.

Full text

APA, Harvard, Vancouver, ISO, and other styles

50

Lu, De Cheng, Jian Li, and Zhuo Hua Li. "Effect of nanodiamond particle sizes on damping properties of ZK60 magnesium matrix composites." Materials Research Express 8, no. 12 (December 1, 2021): 126532. http://dx.doi.org/10.1088/2053-1591/ac41df.

Full text

Abstract:

Abstract The aim of the research is to ensure that the material has functional mechanical properties as well as high-damping value. The microstructure, elemental composition, second phase distribution and interface structure of the Mg-based composite with different particle sizes were characterized by Optical Microscope(OM), X-Ray Diffractometer(XRD), Scanning Electron Microscope(SEM), Transmission Electron Microscope(TEM) and Energy Dispersive Spectrometer (EDS). The mechanical and damping properties of the ZK60 magnesium matrix composites were investigated an Instron5982 universal tester and Dynamic Mechanical Analysis (DMA). The results indicate that nanodiamond(ND) can disperse well in the composites. The elastic modulus of composite can reach 9.9 GPa after reinforcement phase being added. Under certain conditions,the damping value can reach beyond 2.5 × 10–1, which is 117% of other composite. High-temperature damping depends on grain boundary slip and interface slip. The interfacial damping depends on the difference in the incoherent interface and thermal expansion coefficient between the nanodiamond and ZK60 matrix to slip and improve the damping value.

APA, Harvard, Vancouver, ISO, and other styles

Journal articles on the topic 'Nanodiamonds – Analysi'

Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles