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https://www.readbyqxmd.com/read/28335361/preparation-and-characterization-of-zirconia-coated-nanodiamonds-as-a-pt-catalyst-support-for-methanol-electro-oxidation
#1
Jing Lu, Jianbing Zang, Yanhui Wang, Yongchao Xu, Xipeng Xu
Zirconia-coated nanodiamond (ZrO₂/ND) electrode material was successfully prepared by one-step isothermal hydrolyzing from ND-dispersed ZrOCl₂·8H₂O aqueous solution. High-resolution transmission electron microscopy reveals that a highly conformal and uniform ZrO₂ shell was deposited on NDs by this simple method. The coating obtained at 90 °C without further calcination was mainly composed of monoclinic nanocrystalline ZrO₂ rather than common amorphous Zr(OH)₄ clusters. The ZrO₂/NDs and pristine ND powder were decorated with platinum (Pt) nanoparticles by electrodeposition from 5 mM chloroplatinic acid solution...
December 2, 2016: Nanomaterials
https://www.readbyqxmd.com/read/28335345/electrostatic-self-assembly-of-diamond-nanoparticles-onto-al-and-n-polar-sputtered-aluminum-nitride-surfaces
#2
Taro Yoshikawa, Markus Reusch, Verena Zuerbig, Volker Cimalla, Kee-Han Lee, Magdalena Kurzyp, Jean-Charles Arnault, Christoph E Nebel, Oliver Ambacher, Vadim Lebedev
Electrostatic self-assembly of diamond nanoparticles (DNPs) onto substrate surfaces (so-called nanodiamond seeding) is a notable technique, enabling chemical vapor deposition (CVD) of nanocrystalline diamond thin films on non-diamond substrates. In this study, we examine this technique onto differently polarized (either Al- or N-polar) c-axis oriented sputtered aluminum nitride (AlN) film surfaces. This investigation shows that Al-polar films, as compared to N-polar ones, obtain DNPs with higher density and more homogeneously on their surfaces...
November 17, 2016: Nanomaterials
https://www.readbyqxmd.com/read/28328030/estimation-of-microscope-drift-using-fluorescent-nanodiamonds-as-fiducial-markers
#3
W Colomb, J Czerski, J D Sau, S K Sarkar
Fiducial markers are used to correct the microscope drift and should be photostable, be usable at multiple wavelengths and be compatible for multimodal imaging. Fiducial markers such as beads, gold nanoparticles, microfabricated patterns and organic fluorophores lack one or more of these criteria. Moreover, the localization accuracy and drift correction can be degraded by other fluorophores, instrument noise and artefacts due to image processing and tracking algorithms. Estimating mechanical drift by assuming Gaussian distributed noise is not suitable under these circumstances...
March 22, 2017: Journal of Microscopy
https://www.readbyqxmd.com/read/28323249/local-density-of-electromagnetic-states-in-plasmonic-nanotapers-spatial-resolution-limits-with-nitrogen-vacancy-centers-in-diamond-nanospheres
#4
Rafael Salas-Montiel, Martin Berthel, Josslyn Beltrán-Madrigal, Serge Huant, Aurélien Drezet, Sylvain Blaize
One of the most explored single quantum emitters for the development of nanoscale fluorescence lifetime imaging is the nitrogen-vacancy (NV) color center in diamond. Indeed, a NV center does not experience fluorescence bleaching and blinking at room temperature. Furthermore, its optical properties are preserved when embedded into nanodiamond hosts. This letter focuses on the modeling of the local density of states (LDOS) in a plasmonic nanofocusing structure with NV center acting as local illumination sources...
March 21, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28317922/optical-imaging-of-localized-chemical-events-using-programmable-diamond-quantum-nanosensors
#5
Torsten Rendler, Jitka Neburkova, Ondrej Zemek, Jan Kotek, Andrea Zappe, Zhiqin Chu, Petr Cigler, Jörg Wrachtrup
Development of multifunctional nanoscale sensors working under physiological conditions enables monitoring of intracellular processes that are important for various biological and medical applications. By attaching paramagnetic gadolinium complexes to nanodiamonds (NDs) with nitrogen-vacancy (NV) centres through surface engineering, we developed a hybrid nanoscale sensor that can be adjusted to directly monitor physiological species through a proposed sensing scheme based on NV spin relaxometry. We adopt a single-step method to measure spin relaxation rates enabling time-dependent measurements on changes in pH or redox potential at a submicrometre-length scale in a microfluidic channel that mimics cellular environments...
March 20, 2017: Nature Communications
https://www.readbyqxmd.com/read/28291330/cancer-cell-specific-mitochondria-targeted-drug-delivery-by-dual-ligand-functionalized-nanodiamonds-circumvent-drug-resistance
#6
Miu Shan Chan, Ling Sum Liu, Hoi Man Leung, Pik Kwan Lo
We demonstrate a nanotechnology approach for the development of cancer-cell-specific subcellular organelle-targeted drug nanocarriers based on photostable nanodiamonds (ND) functionalized with folic acid and mitochondrial localizing sequence (MLS) peptides. We showed that these multifunctional NDs not only distinguish between cancer cells and normal cells, and transport the loaded drugs across the plasma membrane of cancer cells, but also selectively deliver them to mitochondria and induce significant cytotoxicity and cell death compared with free Dox localized in lysosomes...
March 21, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28263571/assembly-of-ultrathin-au-nanowires-from-polymer-analogue-to-colloidal-block
#7
Yuan Chen, Yawen Wang, Jian Peng, Qingchi Xu, Jian Weng, Jun Xu
Ultrathin nanowires (NWs) are considered as ideal building blocks for assembly of complex nanostructures towards future nanodevices. The polymer/particle duality of ultrathin NW plays an important role in the study of solution phase self-assembly behavior of ultrathin NWs, yet it has not been fully exploited. Herein, we demonstrate the effects of polymer/particle duality of ultrathin NWs on the morphologies of assembled complex nanostructures. The length of ultrathin AuNWs directly correlates with the flexibility of NW, and affects polymer-like assembly of NWs, while the concentration of surfactants determines interfacial tension and ligand-solvent interactions, and affects both polymer-like and colloidal assembly of NWs...
March 6, 2017: ACS Nano
https://www.readbyqxmd.com/read/28248516/direct-functionalization-of-an-acid-terminated-nanodiamond-with-azide-enabling-access-to-4-substituted-1-2-3-triazole-functionalized-particles
#8
Zachary C Kennedy, Christopher A Barrett, Marvin G Warner
Azides on the periphery of nanodiamond materials (ND) are of great utility because they have been shown to undergo Cu-catalyzed and Cu-free cycloaddition reactions with structurally diverse alkynes, affording particles tailored for applications in biology and materials science. However, current methods employed to access ND featuring azide groups typically require either harsh pretreatment procedures or multiple synthesis steps and use surface linking groups that may be susceptible to undesirable cleavage. Here we demonstrate an alternative single-step approach to producing linker-free, azide-functionalized ND...
March 8, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28244272/epidermal-inorganic-optoelectronics-for-blood-oxygen-measurement
#9
Haicheng Li, Yun Xu, Xiaomin Li, Ying Chen, Yu Jiang, Changxing Zhang, Bingwei Lu, Jian Wang, Yinji Ma, Yihao Chen, Yin Huang, Minquang Ding, Honghong Su, Guofeng Song, Yi Luo, X Feng
Flexible and stretchable optoelectronics, built-in inorganic semiconductor materials, offer a wide range of unprecedented opportunities and will redefine the conventional rigid optoelectronics in biological application and medical measurement. However, a significant bottleneck lies in the brittleness nature of rigid semiconductor materials and the performance's extreme sensitivity to the light intensity variation due to human skin deformation while measuring physical parameters. In this study, the authors demonstrate a systematic strategy to design an epidermal inorganic optoelectronic device by using specific strain-isolation design, nanodiamond thinning, and hybrid transfer printing...
February 28, 2017: Advanced Healthcare Materials
https://www.readbyqxmd.com/read/28182433/vertical-substrate-mpcvd-epitaxial-nanodiamond-growth
#10
Yan-Kai Tzeng, Jingyuan Linda Zhang, Haiyu Lu, Hitoshi Ishiwata, Jeremy Dahl, Robert M K Carlson, Hao Yan, Peter R Schreiner, Jelena Vučković, Zhi-Xun Shen, Nicholas Melosh, Steven Chu
Color center-containing nanodiamonds have many applications in quantum technologies and biology. Diamondoids, molecular-sized diamonds have been used as seeds in chemical vapor deposition (CVD) growth. However, optimizing growth conditions to produce high crystal quality nanodiamonds with color centers requires varying growth conditions that often leads to ad-hoc and time-consuming, one-at-a-time testing of reaction conditions. In order to rapidly explore parameter space, we developed a microwave plasma CVD technique using a vertical, rather than horizontally oriented stage-substrate geometry...
March 8, 2017: Nano Letters
https://www.readbyqxmd.com/read/28181507/fe-doped-magnetic-nanodiamonds-made-by-ion-implantation
#11
ChienHsu Chen, I C Cho, Hui-Shan Jian, H Niu
Here we present a simple physical method to prepare magnetic nanodiamonds (NDs) using high dose Fe ion-implantation. The Fe atoms are embedded into NDs through Fe ion-implantation and the crystal structure of NDs are recovered by thermal annealing. The results of TEM and Raman examinations indicated the crystal structure of the Fe implanted NDs is recovered completely. The SQUID-VSM measurement shows the Fe-NDs possess room temperature ferromagnetism. That means the Fe atoms are distributed inside the NDs without affecting NDs crystal structure, so the NDs can preserve the original physical and chemical properties of the NDs...
February 9, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28165139/carboxylated-nanodiamonds-can-be-used-as-negative-reference-in-in-vitro-nanogenotoxicity-studies
#12
H Moche, V Paget, D Chevalier, E Lorge, N Claude, H A Girard, J C Arnault, S Chevillard, F Nesslany
Nanodiamonds (NDs) are promising nanomaterials for biomedical applications. However, a few studies highlighted an in vitro genotoxic activity for detonation NDs, which was not evidenced in one of our previous work quantifying γ-H2Ax after 20 and 100 nm high-pressure high-temperature ND exposures of several cell lines. To confirm these results, in the present work, we investigated the genotoxicity of the same 20 and 100 nm NDs and added intermediate-sized NDs of 50 nm. Conventional in vitro genotoxicity tests were used, i...
February 6, 2017: Journal of Applied Toxicology: JAT
https://www.readbyqxmd.com/read/28164103/nanodiamonds-and-nanoparticles-as-tumor-cell-radiosensitizers-promising-results-but-an-obscure-mechanism-of-action
#13
COMMENT
Martin Falk
No abstract text is available yet for this article.
January 2017: Annals of Translational Medicine
https://www.readbyqxmd.com/read/28140488/measuring-nanoscale-thermostability-of-cell-membranes-with-single-gold-diamond-nanohybrids
#14
Pei-Chang Tsai, Chandra P Epperla, Jo-Shan Huang, Oliver Y Chen, Chih-Che Wu, Huan-Cheng Chang
Much of the current understanding of thermal effects in biological systems is based on macroscopic measurements. There is little knowledge about the local thermostability or heat tolerance of subcellular components at the nanoscale. Herein, we show that gold nanorod-fluorescent nanodiamond (GNR-FND) hybrids are useful as a combined nanoheater/nanothermometer in living cells. With the use of a 594 nm laser for both heating and probing, we measure the temperature changes by recording the spectral shifts of the zero-phonon lines of negatively charged nitrogen-vacancy centers in FNDs...
January 31, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28116858/a-copolymer-scaffold-functionalized-with-nanodiamond-particles-enhances-osteogenic-metabolic-activity-and-bone-regeneration
#15
Mohammed A Yassin, Kamal Mustafa, Zhe Xing, Yang Sun, Kristine Eldevik Fasmer, Thilo Waag, Anke Krueger, Doris Steinmüller-Nethl, Anna Finne-Wistrand, Knut N Leknes
Functionalizing polymer scaffolds with nanodiamond particles (nDPs) has pronounced effect on the surface properties, such as improved wettability, an increased active area and binding sites for cellular attachment and adhesion, and increased ability to immobilize biomolecules by physical adsorption. This study aims to evaluate the effect of poly(l-lactide-co-ε-caprolactone) (poly(LLA-co-CL)) scaffolds, functionalized with nDPs, on bone regeneration in a rat calvarial critical size defect. Poly(LLA-co-CL) scaffolds functionalized with nDPs are also compared with pristine scaffolds with reference to albumin adsorption and seeding efficiency of bone marrow stromal cells (BMSCs)...
January 24, 2017: Macromolecular Bioscience
https://www.readbyqxmd.com/read/28111681/shape-and-crystallographic-orientation-of-nanodiamonds-for-quantum-sensing
#16
S Y Ong, M Chipaux, A Nagl, R Schirhagl
Nanodiamonds with dimensions down to a few tens of nanometers containing nitrogen-vacancy (NV) color centers have revealed their potential as powerful and versatile quantum sensors with a unique combination of spatial resolution and sensitivity. The NV centers allow transducing physical properties, such as strain, temperature, and electric or magnetic field, to an optical transition that can be detected in the single photon range. For example, this makes it possible to sense a single electron spin or a few nuclear spins by detecting their magnetic resonance...
January 23, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28110062/metal-free-hybrids-of-graphitic-carbon-nitride-and-nanodiamonds-for-photoelectrochemical-and-photocatalytic-applications
#17
Li Zhou, Huayang Zhang, Xiaochen Guo, Hongqi Sun, Shaomin Liu, Moses O Tade, Shaobin Wang
Graphitic carbon nitride (g-C3N4) has been considered as a metal-free, cost-effective, eco-friendly and efficient catalyst for various photoelectrochemical applications. However, compared to conventional metal-based photocatalysts, its photocatalytic activity is still low because of the low mobility of carriers restricted by the polymer nature. Herein, a series of hybrids of g-C3N4 (GCN) and nanodiamonds (NDs) were synthesized using a solvothermal method. The photoelectrochemical performance and photocatalytic efficiency of the GCN/NDs were investigated by means of the generation of photocurrent and photodegradation of methylene blue (MB) solutions under UV-visible light irradiations...
January 12, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28067461/phagocytosis-and-immune-response-studies-of-macrophage-nanodiamond-interactions-in-vitro-and-in-vivo
#18
K-J Huang, C-Y Lee, Y-C Lin, C-Y Lin, E Perevedentseva, S-F Hung, C-L Cheng
The applications of nanodiamond as drug delivery and bio-imaging can require the relinquishing ND-drug conjugate via blood flow, where interaction with immune cells may occur. In this work, we investigated the ND penetration in macrophage and the immune response using the tissue-resident murine macrophages (RAW 264.7). Confocal fluorescence imaging, immunofluorescence analysis of nuclear translocation of interferon regulatory factor IRF-3 and transcriptional factor NF-κΒ, analysis of pro-inflammatory cytokines production IL-1β, IL-6 IL-10 with a reverse transcription-polymerase chain reaction technique were applied...
January 9, 2017: Journal of Biophotonics
https://www.readbyqxmd.com/read/28058432/hydroxyl-radical-production-induced-by-plasma-hydrogenated-nanodiamonds-under-x-ray-irradiation
#19
Magdalena Kurzyp, Hugues A Girard, Yannis Cheref, Emilie Brun, Cecile Sicard-Roselli, Samuel Saada, Jean-Charles Arnault
For the first time, overproduction of hydroxyl radicals (HO˙) induced by plasma hydrogenated detonation nanodiamonds (H-NDs) under X-ray irradiation is reported. Using coumarin (COU) as a fluorescent probe, we reveal a significant increase of 40% of the HO˙ production in the presence of H-NDs (6-100 μg ml(-1)) compared with water alone. This effect is related to the negative electron affinity of the hydrogenated nanodiamonds and illustrates the ability of H-NDs to produce reactive oxygen species probably via electron emission in water under X-ray irradiation...
January 19, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28054764/two-step-assembling-of-near-infrared-off-on-fluorescent-nanohybrids-for-synchronous-tumor-imaging-and-microrna-modulation-based-therapy
#20
Xiongwei Deng, Zhaoxia Yin, Jianqing Lu, Yang Xia, Leihou Shao, Qin Hu, Zhixiang Zhou, Fang Zhang, Shaomei Zhou, Yan Wu, Wang Sheng, Yi Zeng
Theranostic nanoparticles with combined imaging and therapy functions show great promise in cancer precision medicine. In this study, we constructed near-infrared (NIR) "OFF-ON" fluorescent nanohybrids (F-PNDs) for synchronous tumor imaging and microRNA (miRNA) modulation therapy against esophageal cancer. Nanodiamond clusters (NDs) were first functionalized for protamine sulfate immobilization (PNDs) on their surfaces via a noncovalent self-assembling approach and simultaneous encapsulation of NIR emitting fluorescence dye cyanine 5 (Cy-5) (F-PNDs)...
February 1, 2017: ACS Applied Materials & Interfaces
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