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https://www.readbyqxmd.com/read/29340959/matrix-assisted-and-or-laser-desorption-ionization-quadrupole-ion-trap-time-of-flight-mass-spectrometry-of-wo3-clusters-formation-in-gas-phase-nanodiamonds-fullerene-and-graphene-oxide-matrices
#1
Mayuri Vilas Ausekar, Ravi Madhukar Mawale, Pavel Pazdera, Josef Havel
The formation of W x O y+●/-● clusters in the gas phase was studied by laser desorption ionization (LDI) and matrix assisted laser desorption ionization (MALDI) of solid WO3. LDI produced (WO3) n+ ●/- ● (n = 1-7) clusters. In MALDI, when using nano-diamonds (NDs), graphene oxide (GO), or fullerene (C60) matrices, higher mass clusters were generated. In addition to (WO3) n-● clusters, oxygen-rich or -deficient species were found in both LDI and MALDI (with the total number of clusters exceeding one hundred ≈ 137)...
January 16, 2018: Journal of the American Society for Mass Spectrometry
https://www.readbyqxmd.com/read/29337289/antioxidant-activity-of-hydrated-carboxylated-nanodiamonds-and-its-influence-on-water-%C3%AE-radiolysis
#2
Karla Santacruz-Gomez, Andrei Sarabia-Sainz, Monica Acosta-Elias, Manuel Sarabia-Sainz, Woraphong Janetanakit, Nathan Khosla, Rodrigo Melendrez, Martin Pedroza-Montero, Ratnesh Lal
Water radiolysis involves the chemical decomposition of the water molecule into free radicals after the exposure with ionizing radiation. These free radicals have deleterious effects on normal cell physiology. Carboxylated nanodiamonds (cNDs) appear to modulate the deleterious effects of γ-irradiation on red blood cells (RBCs) pathophysiology. In the present work, the antioxidant activity of hydrated-cNDs (h-cNDs) on limiting the oxidative damage (water radiolysis effect) by γ-irradiation was confirmed. Our results show that h-cNDs has remarkable free radicals scavenging ability and preserves the catalase enzymatic activity after γ-irradiation...
January 16, 2018: Nanotechnology
https://www.readbyqxmd.com/read/29335424/functionalisation-of-detonation-nanodiamond-for-monodispersed-soluble-dna-nanodiamond-conjugates-using-mixed-silane-bead-assisted-sonication-disintegration
#3
Robert Edgington, Katelyn M Spillane, George Papageorgiou, William Wray, Hitoshi Ishiwata, Mariana Labarca, Sergio Leal-Ortiz, Gordon Reid, Martin Webb, John Foord, Nicholas Melosh, Andreas T Schaefer
Nanodiamonds have many attractive properties that make them suitable for a range of biological applications, but their practical use has been limited because nanodiamond conjugates tend to aggregate in solution during or after functionalisation. Here we demonstrate the production of DNA-detonation nanodiamond (DNA-DND) conjugates with high dispersion and solubility using an ultrasonic, mixed-silanization chemistry protocol based on the in situ Bead-Assisted Sonication Disintegration (BASD) silanization method...
January 15, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29328622/laser-induced-conversion-of-teflon-into-fluorinated-nanodiamonds-or-fluorinated-graphene
#4
Ruquan Ye, Xiao Han, Dmitry V Kosynkin, Yilun Li, Chenhao Zhang, Bo Jiang, Angel A Marti, James M Tour
Laser-assisted materials fabrication is an advance that has propelled recent carbon synthesis approaches. Direct laser writing on polyimide or lignocellulose materials by a CO2 laser has successfully transformed the substrates into hierarchical graphene. However, formation of other carbon allotropes such as diamond and fullerene remains challenging. Here we report the direct synthesis of fluorinated nanodiamonds or fluorinated graphene by treating polytetrafluoroethylene (Teflon, or PTFE) with a 9.3 μm pulsed CO2 laser under argon; no exogenous fluorine source is needed...
January 12, 2018: ACS Nano
https://www.readbyqxmd.com/read/29324795/nanodiamonds-facilitate-killing-of-intracellular-uropathogenic-e-coli-in-an-in-vitro-model-of-urinary-tract-infection-pathogenesis
#5
Janaki Kannan Iyer, Alexia Dickey, Parvaneh Rouhani, Anil Kaul, Nirmal Govindaraju, Raj Narain Singh, Rashmi Kaul
About 25-44% of women will experience at least one episode of recurrent UTI and the causative agent in over 70% of UTI cases is uropathogenic Escherichia coli (UPEC). UPEC cause recurrent UTI by evading the bladder's innate immune system through internalization into the bladder epithelium where antibiotics cannot reach or be effective. Thus, it is important to develop novel therapeutics to eliminate these intracellular pathogens. Nanodiamonds (NDs) are biocompatible nanomaterials that serve as promising candidates for targeted therapeutic applications...
2018: PloS One
https://www.readbyqxmd.com/read/29324712/positron-spectroscopy-of-nanodiamonds-after-hydrogen-sorption
#6
Lyudmila Nikitina, Roman Laptev, Yuri Abzaev, Andrey Lider, Alexander Ivashutenko
The structure and defects of nanodiamonds influence the hydrogen sorption capacity. Positronium can be used as a sensor for detecting places with the most efficient capture of hydrogen atoms. Hydrogenation of carbon materials was performed from gas atmosphere. The concentration of hydrogen absorbed by the sample depends on the temperature and pressure. The concentration 1.2 wt % is achieved at the temperature of 243 K and the pressure of 0.6 MPa. The hydrogen saturation of nanodiamonds changes the positron lifetime...
January 11, 2018: Nanomaterials
https://www.readbyqxmd.com/read/29323372/highly-stable-lipid-encapsulation-of-fluorescent-nanodiamonds-for-bioimaging-applications
#7
Shingo Sotoma, Feng-Jen Hsieh, Yen-Wei Chen, Pei-Chang Tsai, Huan-Cheng Chang
Highly stable lipid-encapsulated fluorescent nanodiamonds (FNDs) are produced by photo-crosslinking of diacetylene-containing lipids physically attached to the FND surface. Not only is this coating method simple and fast, but also it gives the FND-lipid hybrids favorable properties for bioapplications. The hybrids are useful as fluorescent biolabels as well as fiducial markers for correlative light and electron microscopy.
January 11, 2018: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/29316394/delivery-of-amonafide-from-fructose-coated-nanodiamonds-by-oxime-ligation-for-treatment-of-human-breast-cancer
#8
Jiacheng Zhao, Mingxia Lu, Haiwang Lai, Hongxu Lu, Jacques Lalevée, Christopher Barner-Kowollik, Martina H Stenzel, Pu Xiao
Introducing a strategy towards polymer/nanodiamond hybrids with high polymer grafting density and accessible polymer structural characterisation is of critical importance for nanodiamonds surface modification and bioagent attachment for their biomedical application. Here, we report a glycopolymer/nanodiamond hybrid drug delivery system, which was prepared by grafting amonafide-conjugated glycopolymers onto the surface of nanodiamonds via oxime ligation. Poly(1-O-methacryloyl-2,3:4,5-di-O-isopropylidene-β-D-fructopyranose)-b-poly(3-vinylbenzaldehyde-co-methyl methacrylate), featuring pendant aldehyde groups, is prepared via RAFT polymerization...
January 9, 2018: Biomacromolecules
https://www.readbyqxmd.com/read/29297115/detection-of-nanodiamonds-in-biological-samples-by-epr-spectrometry
#9
E V Inzhevatkin, A V Baron, N G Maksimov, M B Volkova, A P Puzyr, V S Bondar
In model experiments in vitro, the applicability of the EPR spectrometry method for the detection of modified nanodiamonds (MNDs) in blood and homogenates of mouse organs has been established. A characteristic signal (g = 2.003, ΔH ≈ 10 G) is observed in the samples of biomaterials containing MNDs, the intensity of which increases linearly with the concentration of nanoparticles in the range of 1.6-200 μg MNDs per 1 mL of the sample. The EPR method in biomaterials reveals the presence of intrinsic paramagnetic centers, signals from which are superimposed on the signal from the MNDs...
November 2017: Doklady. Biochemistry and Biophysics
https://www.readbyqxmd.com/read/29260164/angstrom-scale-probing-of-paramagnetic-centers-location-in-nanodiamonds-by-3he-nmr-at-low-temperatures
#10
Vyacheslav Kuzmin, Kajum Safiullin, Gleb Dolgorukov, Andrey Stanislavovas, Egor Alakshin, Timur Safin, Boris Yavkin, Sergei Orlinskii, Airat Kiiamov, Mikhail Presnyakov, Alexander Klochkov, Murat Tagirov
In this article a method to assess the location of paramagnetic centers in nanodiamonds was proposed. The nuclear magnetic relaxation of adsorbed 3He used as a probe in this method was studied at temperatures of 1.5-4.2 K and magnetic fields of 100-600 mT. A strong influence of the paramagnetic centers of the sample on the 3He nuclear spin relaxation time T1 was found. Preplating the nanodiamond surface with adsorbed nitrogen layers allowed us to vary the distance from 3He nuclei to paramagnetic centers in a controlled way and to determine their location using a simple model...
December 20, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/29251417/sted-tem-correlative-microscopy-leveraging-nanodiamonds-as-intracellular-dual-contrast-markers
#11
Neeraj Prabhakar, Markus Peurla, Sami Koho, Takahiro Deguchi, Tuomas Näreoja, Huan-Cheng Chang, Jessica M Rosenholm, Pekka E Hänninen
Development of fluorescent and electron dense markers is essential for the implementation of correlative light and electron microscopy, as dual-contrast landmarks are required to match the details in the multimodal images. Here, a novel method for correlative microscopy that utilizes fluorescent nanodiamonds (FNDs) as dual-contrast probes is reported. It is demonstrated how the FNDs can be used as dual-contrast labels-and together with automatic image registration tool SuperTomo, for precise image correlation-in high-resolution stimulated emission depletion (STED)/confocal and transmission electron microscopy (TEM) correlative microscopy experiments...
December 18, 2017: Small
https://www.readbyqxmd.com/read/29247665/photodynamic-and-photothermal-tumor-therapy-using-phase-change-material-nanoparticles-containing-chlorin-e6-and-nanodiamonds
#12
Tae-Kyung Ryu, Seung-Woon Baek, Rae-Hyung Kang, Ki-Young Jeong, Dae-Ryong Jun, Sung-Wook Choi
This paper describes the fabrication and evaluation of phase-change material (PCM) nanoparticles containing chlorin e6 (Ce6) and nanodiamonds (NDs) for photodynamic and photothermal approaches for tumor therapy, respectively. The temperature of the PCM nanoparticles containing NDs (ND/PCM, 0.5mg/mL in water) is increased to 45°C during laser exposure for 5min. The singlet oxygen generation intensity of PCM nanoparticles containing Ce6 and NDs (Ce6/ND/PCM) is gradually increased with respect to the laser exposure time...
December 13, 2017: Journal of Controlled Release: Official Journal of the Controlled Release Society
https://www.readbyqxmd.com/read/29216117/nanometer-scale-luminescent-thermometry-in-bovine-embryos
#13
Masfer Alkahtani, Linkun Jiang, Robert Brick, Philip Hemmer, Marlan Scully
Luminescent nanothermometry is a powerful tool that can precisely monitor temperature changes in animal embryos. Among the most sensitive nanoluminescent temperature sensors are fluorescent nanodiamonds (FNDs), having nitrogen-vacancy color centers, and lanthanide-ion-doped upconversion nanoparticles (UCNPs). Here, we investigate their use as nanothermometers inside bovine embryos. The motivation for using both FNDs and UCNPs to measure temperature is to avoid the question of sensor confusion by the local cellular environment...
December 1, 2017: Optics Letters
https://www.readbyqxmd.com/read/29200855/vascular-thrombus-imaging-in-vivo-via-near-infrared-fluorescent-nanodiamond-particles-bioengineered-with-the-disintegrin-bitistatin-part-ii
#14
Jonathan A Gerstenhaber, Frank C Barone, Cezary Marcinkiewicz, Jie Li, Aaron O Shiloh, Mark Sternberg, Peter I Lelkes, Giora Feuerstein
The aim of this feasibility study was to test the ability of fluorescent nanodiamond particles (F-NDP) covalently conjugated with bitistatin (F-NDP-Bit) to detect vascular blood clots in vivo using extracorporeal near-infrared (NIR) imaging. Specifically, we compared NIR fluorescence properties of F-NDP with N-V (F-NDPNV) and N-V-N color centers and sizes (100-10,000 nm). Optimal NIR fluorescence and tissue penetration across biological tissues (rat skin, porcine axillary veins, and skin) was obtained for F-NDPNV with a mean diameter of 700 nm...
2017: International Journal of Nanomedicine
https://www.readbyqxmd.com/read/29192277/graphene-edge-dielectrophoretic-tweezers-for-trapping-of-biomolecules
#15
Avijit Barik, Yao Zhang, Roberto Grassi, Binoy Paulose Nadappuram, Joshua B Edel, Tony Low, Steven J Koester, Sang-Hyun Oh
The many unique properties of graphene, such as the tunable optical, electrical, and plasmonic response make it ideally suited for applications such as biosensing. As with other surface-based biosensors, however, the performance is limited by the diffusive transport of target molecules to the surface. Here we show that atomically sharp edges of monolayer graphene can generate singular electrical field gradients for trapping biomolecules via dielectrophoresis. Graphene-edge dielectrophoresis pushes the physical limit of gradient-force-based trapping by creating atomically sharp tweezers...
November 30, 2017: Nature Communications
https://www.readbyqxmd.com/read/29183003/direct-hyperpolarization-of-micro-and-nanodiamonds-for-bioimaging-applications-considerations-on-particle-size-functionalization-and-polarization-loss
#16
Grzegorz Kwiatkowski, Fabian Jähnig, Jonas Steinhauser, Patrick Wespi, Matthias Ernst, Sebastian Kozerke
Due to the inherently long relaxation time of 13C spins in diamond, the nuclear polarization enhancement obtained with dynamic nuclear polarization can be preserved for a time on the order of about one hour, opening up an opportunity to use diamonds as a new class of long-lived contrast agents. The present communication explores the feasibility of using 13C spins in directly hyperpolarized diamonds for MR imaging including considerations for potential in vivo applications.
November 21, 2017: Journal of Magnetic Resonance
https://www.readbyqxmd.com/read/29162856/an-organic-fluorophore-nanodiamond-hybrid-sensor-for-photostable-imaging-and-orthogonal-on-demand-biosensing
#17
Malcolm S Purdey, Patrick K Capon, Benjamin J Pullen, Philipp Reineck, Nisha Schwarz, Peter J Psaltis, Stephen J Nicholls, Brant C Gibson, Andrew D Abell
Organic fluorescent probes are widely used to detect key biomolecules; however, they often lack the photostability required for extended intracellular imaging. Here we report a new hybrid nanomaterial (peroxynanosensor, PNS), consisting of an organic fluorescent probe bound to a nanodiamond, that overcomes this limitation to allow concurrent and extended cell-based imaging of the nanodiamond and ratiometric detection of hydrogen peroxide. Far-red fluorescence of the nanodiamond offers continuous monitoring without photobleaching, while the green fluorescence of the organic fluorescent probe attached to the nanodiamond surface detects hydrogen peroxide on demand...
November 21, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29155909/dissociative-ionisation-of-adamantane-a-combined-theoretical-and-experimental-study
#18
Alessandra Candian, Jordy Bouwman, Patrick Hemberger, Andras Bodi, Alexander G G M Tielens
Diamond nanoparticles, or nanodiamonds, are intriguing carbon-based materials which, maybe surprisingly, are the most abundant constituent of presolar grains. While the spectroscopic properties of even quite large diamondoids have already been explored, little is known about their unimolecular fragmentation processes. In this paper we characterise the dissociative ionisation of adamantane (C10H16) - the smallest member of the diamondoid family - utilising imaging Photoelectron Photoion Coincidence (iPEPICO) spectroscopy and Density Functional Theory (DFT) calculations...
November 20, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/29153713/facile-modification-of-nanodiamonds-with-hyperbranched-polymers-based-on-supramolecular-chemistry-and-their-potential-for-drug-delivery
#19
Hongye Huang, Meiying Liu, Ruming Jiang, Junyu Chen, Liucheng Mao, Yuanqing Wen, Jianwen Tian, Naigen Zhou, Xiaoyong Zhang, Yen Wei
Due to their excellent chemical stability and remarkable biocompatibility, nanodiamonds (NDs) have received widespread research attention by the biomedical field. The excellent water dispersibility of NDs has significant importance for biomedical applications. Therefore, surface modification of NDs with hydrophilic polymers has been extensively investigated over the past few decades. In this study, we synthesize β-CD containing hyperbranched polymer functionalized ND (ND-β-CD-HPG) composites with high water dispersibility via supramolecular chemistry based on the host-guest interactions between β-Cyclodextrin (β-CD) and adamantine (Ad)...
November 9, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/29148302/adoption-of-nanodiamonds-as-biomedical-materials-for-bone-repair
#20
Sayantani Basu, Settimio Pacelli, Jinxi Wang, Arghya Paul
No abstract text is available yet for this article.
December 2017: Nanomedicine
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