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Mehran Kianinia, Olga Shimoni, Avi Bendavid, Andreas W Schell, Steven J Randolph, Milos Toth, Igor Aharonovich, Charlene J Lobo
Arrays of fluorescent nanoparticles are highly sought after for applications in sensing, nanophotonics and quantum communications. Here we present a simple and robust method of assembling fluorescent nanodiamonds into macroscopic arrays. Remarkably, the yield of this directed assembly process is greater than 90% and the assembled patterns withstand ultra-sonication for more than three hours. The assembly process is based on covalent bonding of carboxyl to amine functional carbon seeds and is applicable to any material, and to non-planar surfaces...
October 13, 2016: Nanoscale
F Gorrini, M Cazzanelli, N Bazzanella, R Edla, M Gemmi, V Cappello, J David, C Dorigoni, A Bifone, A Miotello
Nanodiamonds are the subject of active research for their potential applications in nano-magnetometry, quantum optics, bioimaging and water cleaning processes. Here, we present a novel thermodynamic model that describes a graphite-liquid-diamond route for the synthesis of nanodiamonds. Its robustness is proved via the production of nanodiamonds powders at room-temperature and standard atmospheric pressure by pulsed laser ablation of pyrolytic graphite in water. The aqueous environment provides a confinement mechanism that promotes diamond nucleation and growth, and a biologically compatible medium for suspension of nanodiamonds...
October 12, 2016: Scientific Reports
Zak E Hughes, Tiffany R Walsh
The removal or structural disruption of crystallised lipid is a pivotal but energy-intensive step in a wide range of industrial and biological processes. Strategies to disrupt the structure of crystallised lipid in aqueous solution at lower temperatures are much needed, where nanoparticle-based strategies show enormous promise. Using the aqueous tristearin bilayer as a model for crystallised lipid, we demonstrate that the synergistic use of surfactant and detonation nanodiamonds can depress the onset temperature at which disruption of the crystallised lipid structure occurs...
October 12, 2016: Soft Matter
Masazumi Fujiwara, Kazuma Yoshida, Tetsuya Noda, Hideaki Takashima, Andreas W Schell, Norikazu Mizuochi, Shigeki Takeuchi
We report on the coupling of single nitrogen vacancy (NV) centers to ultrathin fiber-taper nanofibers by the manipulation of single diamond nanocrystals on the nanofibers under real-time observation of nanodiamond fluorescence. Spin-dependent fluorescence of the single NV centers is efficiently detected through the nanofiber. We show control of the spin sub-level structure of the electronic ground state using an external magnetic field and clearly observe a frequency fine tuning of [Formula: see text]. This observation demonstrates a possibility of realizing fiber-integrated quantum λ-systems, which can be used for various quantum information devices including push-pull quantum memory and quantum gates...
November 11, 2016: Nanotechnology
Vitaly V Chaban, Eudes Eterno Fileti
A nanofluid (NF) is composed of a base liquid and suspended nanoparticles (NPs). High-performance NFs exhibit significantly better heat conductivities, as compared to their base liquids. In the present work, we applied all-atom molecular dynamics (MD) simulations to characterize diffusive and ballistic energy transfer mechanisms within nanodiamonds (NDs), carbon nanotubes (CNTs), and N-butylpyridinium tetrafluoroborate ionic liquid (IL). We showed that heat transfer within both NDs and CNTs is orders of magnitude faster than that in the surrounding IL, whereas diffusion of all particles in the considered NF is similar...
September 29, 2016: Physical Chemistry Chemical Physics: PCCP
Yang Li, Lei Wang, Bo Li, Meicheng Zhang, Rui Wen, Xinghua Guo, Xing Li, Ji Zhang, Shoujian Li, Lijian Ma
A new strategy combining pore-free matrix and cooperative-chelating was proposed in the present paper in order to effectively avoid undesired non-selective physical adsorption and intra-particle diffusion caused by pores and voids in porous sorbents, and to greatly enhance uranium-chelating capability based on hyperbranched amidoxime ligands on the surface of nanodiamond particles. Thus a pore-free, amidoxime-terminated hyperbranched nanodiamond (ND-AO) was designed and synthesized. The experimental results demonstrate that the strategy endows the as-synthesized ND-AO with following expected features: (1) distinctively high uranium selectivity (SU = qe-U /qe-tol ×100 %) from over 80% to nearly 100 % over the whole weak acidity range (pH < 4...
October 4, 2016: ACS Applied Materials & Interfaces
Philippe Babilotte
Among the several aspects involved into the synthesis of monocharged nitrogene-vacancy N V (-) colored centers produced into nanodiamonds ND, the post-annealing cleaning process, such as sulfo-nitric acid cleaning or thermal oxidation under acid conditions, can be seen as a factor impacting the optical response of these N V (-) colored centers. A significative difference of optical response is in fact noticed modifying the post-annealing treatment conditions, between a pure oxidative treatment at room temperature and a mixed-process including oxidation and thermal activation...
September 30, 2016: Journal of Fluorescence
Hyoung-Il Kim, Seunghyun Weon, Homan Kang, Anna L Hagstrom, Oh Seok Kwon, Yoon-Sik Lee, Wonyong Choi, Jae-Hong Kim
This study demonstrates the first reported photocatalytic decomposition of an indoor air pollutant, acetaldehyde, using low-energy, sub-bandgap photons harnessed through sensitized triplet-triplet annihilation (TTA) upconversion (UC). To utilize low-intensity noncoherent indoor light and maximize photocatalytic activity, we designed a plasmon-enhanced sub-bandgap photocatalyst device consisting of two main components: (1) TTA-UC rubbery polymer films containing broad-band plasmonic particles (Ag-SiO2) to upconvert sub-bandgap photons, and (2) nanodiamond (ND)-loaded WO3 as a visible-light photocatalyst composite...
October 18, 2016: Environmental Science & Technology
N Rammohan, A Filicko, K MacRenaris, D Ho, T J Meade
No abstract text is available yet for this article.
October 1, 2016: International Journal of Radiation Oncology, Biology, Physics
Li-Xia Su, Qing Lou, Zhen Jiao, Chong-Xin Shan
Despite extensive work on fluorescence behavior stemming from color centers of diamond, reports on the excitation-dependent fluorescence of nanodiamonds (NDs) with a large-scale redshift from 400 to 620 nm under different excitation wavelengths are so far much fewer, especially in biological applications. The fluorescence can be attributed to the combined effects of the fraction of sp(2)-hybridized carbon atoms among the surface of the fine diamond nanoparticles and the defect energy trapping states on the surface of the diamond...
December 2016: Nanoscale Research Letters
Chen-Hon Nee, Seong-Ling Yap, Teck-Yong Tou, Huan-Cheng Chang, Seong-Shan Yap
Carbon nanomaterials exhibit novel characteristics including enhanced thermal, electrical, mechanical, and biological properties. Nanodiamonds; first discovered in meteorites are found to be biocompatible, non-toxic and have distinct optical properties. Here we show that nanodiamonds with the size of <5 nm are formed directly from ethanol via 1025 nm femtosecond laser irradiation. The absorption of laser energy by ethanol increased non-linearly above 100 μJ accompanied by a white light continuum arises from fs laser filamentation...
2016: Scientific Reports
Yu Sun, Qiaoqin Yang, Haidong Wang
Multifunctional tissue scaffold material nanodiamond (ND)/chitosan (CS) composites with different diamond concentrations from 1 wt % to 5 wt % were synthesized through a solution casting method. The microstructure and mechanical properties of the composites were characterized using scanning electron microscopy (SEM), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), and nanoindentation. Compared with pristine CS, the addition of ND resulted in a significant improvement of mechanical properties, including a 239%, 276%, 321%, 333%, and 343% increase in Young's modulus and a 68%, 96%, 114%, 118%, and 127% increase in hardness when the ND amount was 1 wt %, 2 wt %, 3 wt %, 4 wt %, and 5 wt %, respectively...
September 15, 2016: Journal of Functional Biomaterials
Weina Liu, Boris Naydenov, Sabyasachi Chakrabortty, Bettina Wuensch, Kristina Hübner, Sandra Ritz, Helmut Cölfen, Holger Barth, Kaloian Koynov, Haoyuan Qi, Robert Leiter, Rolf Reuter, Jörg Wrachtrup, Felix Boldt, Jonas Scheuer, Ute Kaiser, Miguel Sison, Theo Lasser, Philip Tinnefeld, Fedor Jelezko, Paul Walther, Yuzhou Wu, Tanja Weil
There is a continuous demand for imaging probes offering excellent performance in various microscopy techniques for comprehensive investigations of cellular processes by more than one technique. Fluorescent nanodiamond-gold nanoparticles (FND-Au) constitute a new class of "all-in-one" hybrid particles providing unique features for multimodal cellular imaging including optical imaging, electron microscopy, and, and potentially even quantum sensing. Confocal and optical coherence microscopy of the FND-Au allow fast investigations inside living cells via emission, scattering, and photothermal imaging techniques because the FND emission is not quenched by AuNPs...
October 12, 2016: Nano Letters
Avijit Barik, Xiaoshu Chen, Sang-Hyun Oh
We demonstrate nanogap electrodes for rapid, parallel, and ultralow-power trapping of nanoparticles. Our device pushes the limit of dielectrophoresis by shrinking the separation between gold electrodes to sub-10 nm, thereby creating strong trapping forces at biases as low as the 100 mV ranges. Using high-throughput atomic layer lithography, we manufacture sub-10 nm gaps between 0.8 mm long gold electrodes and pattern them into individually addressable parallel electronic traps. Unlike pointlike junctions made by electron-beam lithography or larger micron-gap electrodes that are used for conventional dielectrophoresis, our sub-10 nm gold nanogap electrodes provide strong trapping forces over a mm-scale trapping zone...
October 12, 2016: Nano Letters
A V Baron, N V Osipov, S V Yashchenko, Yu A Kokotukha, I J Baron, A P Puzyr, I A Olkhovskiy, V S Bondar
Adsorption of viral particles from the blood plasma of patients with viral hepatitis B and C on modified nanodiamonds (MNDs) was shown in the in vitro experiments. PCR method showed the treatment of plasma with MNDs leads to a decrease in the viral load by 2-3 orders of magnitude or more in both cases studied. These results make it possible to predict the applicability of MNDs for the development of new technologies of hemodialysis and plasmapheresis for binding and removal of viral particles from the blood of infected patients...
July 2016: Doklady. Biochemistry and Biophysics
Hongshin Lee, Hyoung-Il Kim, Seunghyun Weon, Wonyong Choi, Yu Sik Hwang, Jiwon Seo, Changha Lee, Jae-Hong Kim
This study introduces graphited nanodiamond (G-ND) as an environmentally friendly, easy-to-regenerate, and cost-effective alternative catalyst to activate persulfate (i.e., peroxymonosulfate (PMS) and peroxydisulfate (PDS)) and oxidize organic compounds in water. The G-ND was found to be superior for persulfate activation to other benchmark carbon materials such as graphite, graphene, fullerene, and carbon nanotubes. The G-ND/persulfate showed selective reactivity toward phenolic compounds and some pharmaceuticals, and the degradation kinetics were not inhibited by the presence of oxidant scavengers and natural organic matter...
September 20, 2016: Environmental Science & Technology
K Turcheniuk, C Trecazzi, C Deeleepojananan, V N Mochalin
We report a new facile, inexpensive, and contaminant-free technique of salt-assisted ultrasonic deaggregation (SAUD) of nanodiamond into single-digit particles stable in aqueous colloidal solution in a wide pH range. The technique utilizes the energy of ultrasound to break apart nanodiamond aggregates in sodium chloride aqueous slurry. In contrast to current deaggregation techniques, which introduce zirconia contaminants into nanodiamond, the single-digit nanodiamond colloids produced by SAUD have no toxic or difficult-to-remove impurities and are therefore well-suited to produce nanodiamonds for numerous applications, including theranostics, composites, and lubrication, etc...
September 28, 2016: ACS Applied Materials & Interfaces
Gurpreet K Dhindsa, Debsindhu Bhowmik, Monojoy Goswami, Hugh M O'Neill, Eugene Mamontov, Bobby G Sumpter, Liang Hong, Panchapakesan Ganesh, Xiang-Qiang Chu
Non-toxic, biocompatible nanodiamonds (ND) have recently been implemented in rational, systematic design of optimal therapeutic use in nanomedicines. However, hydrophilicity of the ND surface strongly influences structure and dynamics of biomolecules that restrict in situ applications of ND. Therefore, fundamental understanding of the impact of hydrophilic ND surface on biomolecules at molecular level is essential. For tRNA, we observe an enhancement of dynamical behavior in the presence of ND contrary to generally observed slow motion at strongly interacting interfaces...
September 1, 2016: Journal of Physical Chemistry. B
David Amans, Mouhamed Diouf, Julien Lam, Gilles Ledoux, Christophe Dujardin
Carbon-based materials are of great technological and scientific interest in materials science. Pulsed laser ablation in liquids (PLAL) is extensively used as a method to produce nanoparticles including nanodiamond and related materials. In this feature article, we will review the use of PLAL to tackle the challenges of synthesizing carbon-based nanostructures. Surprisingly, reported results have shown very poor reproducibility despite the use of similar experimental conditions. We use plasma spectroscopy and shadowgraph imaging to provide a picture of the thermodynamic properties, and then to better understand this apparent contradiction...
August 16, 2016: Journal of Colloid and Interface Science
Young-Jin Ko, Keunsu Choi, Soonjae Lee, Jung-Min Cho, Heon-Jin Choi, Seok Won Hong, Jae-Woo Choi, Hiroshi Mizuseki, Wook-Seong Lee
The onion-like carbon (OLC) was prepared as adsorbent and tested for the removal of chromate ions from aqueous solutions. The OLC was thermally derived from nanodiamond by vacuum annealing at 1000-2000°C. An investigation was conducted the chromate adsorption mechanism of OLC, by analysing the temperature-dependent evolution of the various oxygen-carbon bonds and the chemisorbed water by X-ray photo electron spectroscopy, as well as by the first principle calculation of the bond energies for relevant bond configurations...
December 15, 2016: Journal of Hazardous Materials
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