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https://www.readbyqxmd.com/read/28646193/fabrication-of-nitrogen-doped-nano-onions-and-their-electrocatalytic-activity-toward-the-oxygen-reduction-reaction
#1
E Y Choi, C K Kim
Nitrogen-doped nano-onions (NNO) were prepared as electrocatalytic materials for the oxygen reduction reaction (ORR). The nano-onions (NO), spherical graphitic material particles, were prepared by pyrolysis of nanodiamonds (ND). Oxidized NO (ONO) was prepared from NO by a modified Hummers' method, and this was mixed with urea, followed by pyrolysis, resulting in the formation of NNO. The nitrogen content and molar ratio of nitrogen-containing groups in the NNOs were varied by controlling the oxygen content of ONO to explore the effect of nitrogen content on the ORR activity...
June 23, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28636640/targeted-nanodiamonds-for-identification-of-subcellular-protein-assemblies-in-mammalian-cells
#2
Michael P Lake, Louis-S Bouchard
Transmission electron microscopy (TEM) can be used to successfully determine the structures of proteins. However, such studies are typically done ex situ after extraction of the protein from the cellular environment. Here we describe an application for nanodiamonds as targeted intensity contrast labels in biological TEM, using the nuclear pore complex (NPC) as a model macroassembly. We demonstrate that delivery of antibody-conjugated nanodiamonds to live mammalian cells using maltotriose-conjugated polypropylenimine dendrimers results in efficient localization of nanodiamonds to the intended cellular target...
2017: PloS One
https://www.readbyqxmd.com/read/28635183/cetuximab-conjugated-nanodiamonds-drug-delivery-system-for-enhanced-targeting-therapy-and-3d-raman-imaging
#3
Dandan Li, Xin Chen, Hong Wang, Jie Liu, Meiling Zheng, Yang Fu, Yuan Yu, Jinfang Zhi
In this study, a multicomponent nanodiamonds (NDs)-based targeting drug delivery system, cetuximab-NDs-cisplatin bioconjugate, combining both specific targeting and enhanced therapeutic efficacy capabilities, is developed and characterized. The specific targeting ability of cetuximab-NDs-cisplatin system on human liver hepatocellular carcinoma (HepG2) cells is evaluated through epidermal growth factor receptor (EGFR) blocking experiments, since EGFR is over-expressed on HepG2 cell membrane. Besides, cytotoxic evaluation confirms that cetuximab-NDs-cisplatin system could significantly inhibit the growth of HepG2 cells, and the therapeutic activity of this system is proven to be better than that of both nonspecific NDs-cisplatin conjugate and specific EGF-NDs-cisplatin conjugate...
June 21, 2017: Journal of Biophotonics
https://www.readbyqxmd.com/read/28605070/nanodiamonds-that-swim
#4
Ji Tae Kim, Udit Choudhury, Hyeon-Ho Jeong, Peer Fischer
Nanodiamonds are emerging as nanoscale quantum probes for bio-sensing and imaging. This necessitates the development of new methods to accurately manipulate their position and orientation in aqueous solutions. The realization of an "active" nanodiamond (ND) swimmer in fluids, composed of a ND crystal containing nitrogen vacancy centers and a light-driven self-thermophoretic micromotor, is reported. The swimmer is propelled by a local temperature gradient created by laser illumination on its metal-coated side...
June 12, 2017: Advanced Materials
https://www.readbyqxmd.com/read/28602087/nanodiamonds-as-nucleating-agents-for-protein-crystallization
#5
Yen-Wei Chen, Chien-Hsun Lee, Yung-Lin Wang, Tsung-Lin Li, Huan-Cheng Chang
Nanodiamond (ND) is a carbon-based nanomaterial with potential for a wide range of biological applications. One of such applications is to facilitate the nucleation of protein crystals in aqueous solution. Here, we show that NDs (nominal diameters of 30 and 100 nm) after surface oxidation in air and subsequent treatment in strong acids are useful as heterogeneous nucleating agents for protein crystallization. Tested with lysozyme, ribonuclease A, proteinase K, and catalase, the nanomaterials in either aggregate or film form are found to be able to increase the crystallization efficiency of all proteins...
June 21, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28601788/carbon-nanostructures-as-immobilization-platform-for-dna-a-review-on-current-progress-in-electrochemical-dna-sensors
#6
REVIEW
P Abdul Rasheed, N Sandhyarani
Development of a sensitive, specific and cost-effective DNA detection method is motivated by increasing demand for the early stage diagnosis of genetic diseases. Recent developments in the design and fabrication of efficient sensor platforms based on nanostructures make the highly sensitive sensors which could indicate very low detection limit to the level of few molecules, a realistic possibility. Electrochemical detection methods are widely used in DNA diagnostics as it provide simple, accurate and inexpensive platform for DNA detection...
June 8, 2017: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/28596105/multifunctional-nanodiamonds-in-regenerative-medicine-recent-advances-and-future-directions
#7
REVIEW
Jonathan Whitlow, Settimio Pacelli, Arghya Paul
With recent advances in the field of nanomedicine, many new strategies have emerged for diagnosing and treating diseases. At the forefront of this multidisciplinary research, carbon nanomaterials have demonstrated unprecedented potential for a variety of regenerative medicine applications including novel drug delivery platforms that facilitate the localized and sustained release of therapeutics. Nanodiamonds (NDs) are a unique class of carbon nanoparticles that are gaining increasing attention for their biocompatibility, highly functional surfaces, optical properties, and robust physical properties...
June 5, 2017: Journal of Controlled Release: Official Journal of the Controlled Release Society
https://www.readbyqxmd.com/read/28553109/bitistatin-functionalized-fluorescent-nanodiamond-particles-specifically-bind-to-purified-human-platelet-integrin-receptor-%C3%AE-iib%C3%AE-3-and-activated-platelets
#8
Cezary Marcinkiewicz, Jonathan A Gerstenhaber, Mark Sternberg, Peter I Lelkes, Giora Feuerstein
Thromboembolic events (TEE) underwrite key causes of death in developed countries. While advanced imaging technologies such as computed tomography scans serve to diagnose blood clots during acute cardiovascular events, no such technology is available in routine primary care for TEE risk assessment. Here, we describe an imaging platform technology based on bioengineered fluorescent nanodiamond particles (F-NDPs) functionalized with bitistatin (Bit), a disintegrin that specifically binds to the αIIbβ3 integrin, platelet fibrinogen receptor (PFR) on activated platelets...
2017: International Journal of Nanomedicine
https://www.readbyqxmd.com/read/28548489/glycosaminoglycans-specific-cell-targeting-and-imaging-using-fluorescent-nanodiamonds-coated-with-viral-envelope-proteins
#9
Minh D Pham, Chandra Prakash Epperla, Chia-Lung Hsieh, Wen Chang, Huan-Cheng Chang
Understanding virus-host interactions is crucial for vaccine development. This study investigates such interactions using fluorescent nanodiamonds (FNDs) coated with vaccinia envelope proteins as the model system. To achieve this goal, we noncovalently conjugated 100 nm FNDs with rA27(aa 21-84), a recombinant envelope protein of vaccinia virus, for glycosaminoglycans (GAGs)-specific targeting and imaging of living cells. Another recombinant protein rDA27(aa 33-84) that removes the GAGs-binding sequences was also used for comparison...
June 8, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28532899/nanodiamond-based-injectable-hydrogel-for-sustained-growth-factor-release-preparation-characterization-and-in-vitro-analysis
#10
Settimio Pacelli, Francisca Acosta, Aparna R Chakravarti, Saheli G Samanta, Jonathan Whitlow, Saman Modaresi, Rafeeq P H Ahmed, Johnson Rajasingh, Arghya Paul
Nanodiamonds (NDs) represent an emerging class of carbon nanomaterials that possess favorable physical and chemical properties to be used as multifunctional carriers for a variety of bioactive molecules. Here we report the synthesis and characterization of a new injectable ND-based nanocomposite hydrogel which facilitates a controlled release of therapeutic molecules for regenerative applications. In particular, we have formulated a thermosensitive hydrogel using gelatin, chitosan and NDs that provides a sustained release of exogenous human vascular endothelial growth factor (VEGF) for wound healing applications...
May 19, 2017: Acta Biomaterialia
https://www.readbyqxmd.com/read/28511000/superconducting-ferromagnetic-nanodiamond
#11
Gufei Zhang, Tomas Samuely, Zheng Xu, Johanna K Jochum, Alexander Volodin, Shengqiang Zhou, Paul W May, Oleksandr Onufriienko, Jozef Kačmarčík, Julian A Steele, Jun Li, Johan Vanacken, Jiri Vacík, Pavol Szabó, Haifeng Yuan, Maarten B J Roeffaers, Dorin Cerbu, Peter Samuely, Johan Hofkens, Victor V Moshchalkov
Superconductivity and ferromagnetism are two mutually antagonistic states in condensed matter. Research on the interplay between these two competing orderings sheds light not only on the cause of various quantum phenomena in strongly correlated systems but also on the general mechanism of superconductivity. Here we report on the observation of the electronic entanglement between superconducting and ferromagnetic states in hydrogenated boron-doped nanodiamond films, which have a superconducting transition temperature Tc ~ 3 K and a Curie temperature TCurie > 400 K...
May 16, 2017: ACS Nano
https://www.readbyqxmd.com/read/28509532/nanodiamonds-mediate-oral-delivery-of-proteins-for-stem-cell-activation-and-intestinal-remodeling-in-drosophila
#12
Xingjie Hu, Xiaojiao Li, Min Yin, Ping Li, Ping Huang, Lihua Wang, Yiguo Jiang, Hui Wang, Nan Chen, Chunhai Fan, Haiyun Song
Introduction of exogenous biomacromolecules into living systems is of great interest in genome editing, cancer immunotherapy, and stem cell reprogramming. Whereas current strategies generally depend on nucleic acids transfection, direct delivery of functional proteins that provides enhanced specificity, increased safety, and fast and temporal regulation is highly desirable. Nevertheless, intracellular delivery of intact and bioactive proteins, especially in vivo, remains poorly explored. In this study, we developed a nanodiamonds (NDs)-based protein delivery system in cultured cells and in Drosophila that showed high adsorption, high efficiency, and effective cytosolic release of fully functional proteins...
June 7, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28471666/ultrabright-linearly-polarized-photon-generation-from-a-nitrogen-vacancy-center-in-a-nanocube-dimer-antenna
#13
Sebastian K H Andersen, Shailesh Kumar, Sergey I Bozhevolnyi
We demonstrate an exceptionally bright photon source based on a single nitrogen-vacancy center (NV center) in a nanodiamond (ND) placed in the nanoscale gap between two monocrystalline silver cubes in a dimer configuration. The system is operated near saturation at a stable photon rate of 850 kcps, while we further achieve strongly polarized emission and high single photon purity, evident by the measured autocorrelation with a g((2))(0) value of 0.08. These photon source features are key parameters for quantum technological applications, such as secure communication based on quantum key distribution...
June 14, 2017: Nano Letters
https://www.readbyqxmd.com/read/28471169/simple-and-mediator-free-urea-sensing-based-on-engineered-nanodiamonds-with-polyaniline-nanofibers-synthesized-in-situ
#14
Vanish Kumar, Rashmi Mahajan, Inderpreet Kaur, Ki-Hyun Kim
In an effort to develop a simple and mediator-free sensing media for urea, a polyaniline (PANI) and graphitized nanodiamond (GND) nanocomposite was prepared at room temperature via an in situ interfacial polymerization approach. The interaction of ions produced during the hydrolysis of urea with nanomaterial was utilized for the amperometric sensing of urea. The performance of this composite (GND/PANI) was evaluated for the detection of urea referenced to PANI. Accordingly, both platforms exhibited good linearity across a varying concentration of 0...
May 10, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28447706/insights-into-the-surface-chemistry-and-electronic-properties-of-sp-2-and-sp-3-hybridized-nanocarbon-materials-for-catalysis
#15
Yangming Lin, Zhenbao Feng, Linhui Yu, Qinging Gu, Shuchang Wu, Dang Sheng Su
Ultra-dispersed nanodiamond and its derivatives (UNDDs), including bucky nanodiamond and onion-like carbon, offer superior catalytic behavior relative to other nanocarbons. However, a systematic study of their unique properties has been rarely achieved. Their surface chemistry and electronic properties are therefore studied to reveal the essential differences of UNDDs compared to other nanocarbons for catalysis.
April 27, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28443626/nanodiamond-enhanced-mri-via-in-situ-hyperpolarization
#16
David E J Waddington, Mathieu Sarracanie, Huiliang Zhang, Najat Salameh, David R Glenn, Ewa Rej, Torsten Gaebel, Thomas Boele, Ronald L Walsworth, David J Reilly, Matthew S Rosen
Nanodiamonds are of interest as nontoxic substrates for targeted drug delivery and as highly biostable fluorescent markers for cellular tracking. Beyond optical techniques, however, options for noninvasive imaging of nanodiamonds in vivo are severely limited. Here, we demonstrate that the Overhauser effect, a proton-electron polarization transfer technique, can enable high-contrast magnetic resonance imaging (MRI) of nanodiamonds in water at room temperature and ultra-low magnetic field. The technique transfers spin polarization from paramagnetic impurities at nanodiamond surfaces to (1)H spins in the surrounding water solution, creating MRI contrast on-demand...
April 26, 2017: Nature Communications
https://www.readbyqxmd.com/read/28433157/enhanced-mechanical-properties-of-chitosan-nanodiamond-composites-by-improving-interphase-using-thermal-oxidation-of-nanodiamond
#17
Zahra Delavar, Akbar Shojaei
Polymer composite films based on chitosan (CS) and nanodimaond (ND) were prepared using solution casting method. ND with variable contents of carboxylic functional group was prepared using thermal oxidation at temperature of 420°C under air atmosphere at various durations of 1.5 and 4.5h. The interfacial interaction between NDs and CS and morphological evolution of CS in presence of NDs were investigated by Fourier transform infrared (FTIR), differential scanning calorimeter (DSC) and X-ray diffraction (XRD) analyses...
July 1, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28423901/estimation-of-nanodiamond-surface-charge-density-from-zeta-potential-and-molecular-dynamics-simulations
#18
Zhenpeng Ge, Yi Wang
Molecular dynamics simulations of nanoparticles (NPs) are increasingly used to study their interactions with various biological macromolecules. Such simulations generally require detailed knowledge of the surface composition of the NP under investigation. Even for some well-characterized nanoparticles, however, this knowledge is not always available. An example is nanodiamond, a nanoscale diamond particle with surface dominated by oxygen-containing functional groups. In this work, we explore using the harmonic restraint method developed by Venable et al...
April 20, 2017: Journal of Physical Chemistry. B
https://www.readbyqxmd.com/read/28417543/efficiency-of-cathodoluminescence-emission-by-nitrogen-vacancy-color-centers-in-nanodiamonds
#19
Huiliang Zhang, David R Glenn, Richard Schalek, Jeff W Lichtman, Ronald L Walsworth
Correlated electron microscopy and cathodoluminescence (CL) imaging using functionalized nanoparticles is a promising nanoscale probe of biological structure and function. Nanodiamonds (NDs) that contain CL-emitting color centers are particularly well suited for such applications. The intensity of CL emission from NDs is determined by a combination of factors, including particle size, density of color centers, efficiency of energy deposition by electrons passing through the particle, and conversion efficiency from deposited energy to CL emission...
June 2017: Small
https://www.readbyqxmd.com/read/28409918/comment-on-activation-of-persulfate-by-graphitized-nanodiamonds-for-removal-of-organic-compounds
#20
Xiaoguang Duan, Hongqi Sun, Shaobin Wang
No abstract text is available yet for this article.
April 14, 2017: Environmental Science & Technology
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