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https://www.readbyqxmd.com/read/28433157/enhanced-mechanical-properties-of-chitosan-nanodiamond-composites-by-improving-interphase-using-thermal-oxidation-of-nanodiamond
#1
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
#2
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
#3
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...
April 18, 2017: Small
https://www.readbyqxmd.com/read/28409918/comment-on-activation-of-persulfate-by-graphitized-nanodiamonds-for-removal-of-organic-compounds
#4
Xiaoguang Duan, Hongqi Sun, Shaobin Wang
No abstract text is available yet for this article.
April 14, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28409917/response-to-comment-on-activation-of-persulfate-by-graphitized-nanodiamonds-for-removal-of-organic-compounds
#5
Hongshin Lee, Changha Lee, Jae-Hong Kim
No abstract text is available yet for this article.
April 14, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28406172/anchored-but-not-internalized-shape-dependent-endocytosis-of-nanodiamond
#6
Bokai Zhang, Xi Feng, Hang Yin, Zhenpeng Ge, Yanhuan Wang, Zhiqin Chu, Helena Raabova, Jan Vavra, Petr Cigler, Renbao Liu, Yi Wang, Quan Li
Nanoparticle-cell interactions begin with the cellular uptake of the nanoparticles, a process that eventually determines their cellular fate. In the present work, we show that the morphological features of nanodiamonds (NDs) affect both the anchoring and internalization stages of their endocytosis. While a prickly ND (with sharp edges/corners) has no trouble of anchoring onto the plasma membrane, it suffers from difficult internalization afterwards. In comparison, the internalization of a round ND (obtained by selective etching of the prickly ND) is not limited by its lower anchoring amount and presents a much higher endocytosis amount...
April 13, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28401206/recent-advances-in-carbon-based-nanosystems-for-cancer-theranostics
#7
REVIEW
Shine Augustine, Jay Singh, Manish Srivastava, Monica Sharma, Asmita Das, Bansi D Malhotra
One of the major challenges in our contemporary society is to facilitate healthy life for all human beings. In this context, cancer has become one of the most deadly diseases around the world, and despite many advances in theranostics techniques the treatment of cancer still remains an important problem. With recent advances made in the field of nano-biotechnology, carbon-based nanostructured materials have drawn special attention because of their unique physicochemical properties, giving rise to great potential for the diagnosis and therapy of cancer...
April 12, 2017: Biomaterials Science
https://www.readbyqxmd.com/read/28395137/dependency-of-nanodiamond-particle-size-and-outermost-surface-composition-on-organo-modification-evaluation-by-formation-of-organized-molecular-films-and-nanohybridization-with-organic-polymers
#8
Taira Tasaki, Yifei Guo, Qi Meng, Muhammad Abdullah Al Mamun, Yusuke Kasahara, Shuichi Akasaka, Atsuhiro Fujimori
The formation behavior of organized organo-modified nanodiamond films and polymer nanocomposites has been investigated using nanodiamonds of several different particle sizes and outermost-surface compositions. The nanodiamond particle sizes used in this study were 3 and 5 nm, and the outermost surface contained -OH and/or -COOH groups. The nanodiamond was organo-modified to prepare -OH2(+) cations and -COO(-) anions on the outermost surface by carboxylic anion of fatty acid and long-chain phosphonium cation, respectively...
April 17, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28389652/nanodiamonds-as-multi-purpose-labels-for-microscopy
#9
S R Hemelaar, P de Boer, M Chipaux, W Zuidema, T Hamoh, F Perona Martinez, A Nagl, J P Hoogenboom, B N G Giepmans, R Schirhagl
Nanodiamonds containing fluorescent nitrogen-vacancy centers are increasingly attracting interest for use as a probe in biological microscopy. This interest stems from (i) strong resistance to photobleaching allowing prolonged fluorescence observation times; (ii) the possibility to excite fluorescence using a focused electron beam (cathodoluminescence; CL) for high-resolution localization; and (iii) the potential use for nanoscale sensing. For all these schemes, the development of versatile molecular labeling using relatively small diamonds is essential...
April 7, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28368852/biomedical-applications-of-nanodiamond-review
#10
Kostiantyn Turcheniuk, Vadym Mochalin
The interest to applications of nanodiamond in biology and medicine is on the rise over the recent years. This is due to the unique combination of properties that nanodiamond provides. Small size (~ 5 nm), low cost, scalable production, negligible toxicity, chemical inertness of diamond core and rich chemistry of nanodiamond surface, as well as bright and robust fluorescence resistant to photobleaching are the distinct parameters that render nanodiamond superior to any other nanomaterial when it comes to biomedical applications...
April 3, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28364714/enhancing-the-colloidal-stability-of-detonation-synthesized-diamond-particles-in-aqueous-solutions-by-adsorbing-organic-mono-bi-and-tridentate-molecules
#11
Tao Wang, Stephan Handschuh-Wang, Panpan Qin, Yang Yang, Xuechang Zhou, Yongbing Tang
Colloidal stability of nanoparticles with particle sizes smaller than 100nm is a critical issue for various research areas, including material science, electronics and biomedicine. We propose a facile, fast and cost-efficient method to increase the colloidal stability by simply adding organic molecules as ligands, which adsorb to the nanoparticle surface subsequently. Citric acid, oxalic acid, glutamic acid and propylamine were found to stabilize the nanodiamond (ND) particles with a mean diameter of approx...
March 25, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28358111/fluorescent-nanodiamonds-enable-quantitative-tracking-of-human-mesenchymal-stem-cells-in-miniature-pigs
#12
Long-Jyun Su, Meng-Shiue Wu, Yuen Yung Hui, Be-Ming Chang, Lei Pan, Pei-Chen Hsu, Yit-Tsong Chen, Hong-Nerng Ho, Yen-Hua Huang, Thai-Yen Ling, Hsao-Hsun Hsu, Huan-Cheng Chang
Cell therapy is a promising strategy for the treatment of human diseases. While the first use of cells for therapeutic purposes can be traced to the 19th century, there has been a lack of general and reliable methods to study the biodistribution and associated pharmacokinetics of transplanted cells in various animal models for preclinical evaluation. Here, we present a new platform using albumin-conjugated fluorescent nanodiamonds (FNDs) as biocompatible and photostable labels for quantitative tracking of human placenta choriodecidual membrane-derived mesenchymal stem cells (pcMSCs) in miniature pigs by magnetic modulation...
March 30, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28347945/structural-effect-of-fe3o4-nanoparticles-on-peroxidase-like-activity-for-cancer-therapy
#13
Shiyan Fu, Shu Wang, Xiaodi Zhang, Anhui Qi, Zhirong Liu, Xin Yu, Chuanfang Chen, Linlin Li
Ferromagnetic nanoparticles (Fe3O4 NPs) have been proven to have the intrinsic peroxidase-like activity. This property has been used for analyte detection, tumor tissue visualization, and cancer therapy, etc. However, the effect of particle structure and morphology on its peroxidase-like activity has been rarely reported. In this work, we fabricated Fe3O4 nanoparticles with different structures (nanoclusters, nanoflowers, and nanodiamonds) by facilely tuning the pH values in the hydrothermal reaction. Their in vitro peroxidase-like activity was evaluated via chromogenic reaction of 3,3',5,5'-tetramethylbenzidine (TMB) by the reduction of H2O2 to H2O...
March 18, 2017: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/28344361/the-interaction-of-fluorescent-nanodiamond-probes-with-cellular-media
#14
Simon R Hemelaar, Andreas Nagl, François Bigot, Melissa M Rodríguez-García, Marcel P de Vries, Mayeul Chipaux, Romana Schirhagl
Fluorescent nanodiamonds (FNDs) are promising tools to image cells, bioanalytes and physical quantities such as temperature, pressure, and electric or magnetic fields with nanometer resolution. To exploit their potential for intracellular applications, the FNDs have to be brought into contact with cell culture media. The interactions between the medium and the diamonds crucially influence sensitivity as well as the ability to enter cells. The authors demonstrate that certain proteins and salts spontaneously adhere to the FNDs and may cause aggregation...
2017: Mikrochimica Acta
https://www.readbyqxmd.com/read/28339126/boron-doped-polygonal-carbon-nano-onions-synthesis-and-applications-in-electrochemical-energy-storage
#15
Marta Eliza Plonska-Brzezinska, Olena Mykhailiv, Krzysztof Brzezinski, Bogdan Sulikowski, Zbigniew Olejniczak, Malgorzata Gras, Grzegorz Lota, Agustin Molina-Ontoria, Michal Jakubczyk, Luis Echegoyen
Doping of carbon nanostructures with heteroatoms, such as boron or nitrogen, is one of the most effective ways to change their properties to make them suitable for various applications. Carbon nano-onions (CNOs) doped with boron (B-CNOs) have been prepared by annealing (1650°C) nanodiamond particles (NDs) under an inert He atmosphere in the presence of B. Their physicochemical properties were measured using transmission (TEM) and scanning (SEM) electron microscopy, X-ray photoelectron spectroscopy (XPS), 10B and 11B solid-state MAS NMR spectroscopy, X-ray powder diffractions (XRD), Raman spectroscopy, porosimetry, and differential-thermogravimetric analyses (TGA-DTG)...
March 24, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28335361/preparation-and-characterization-of-zirconia-coated-nanodiamonds-as-a-pt-catalyst-support-for-methanol-electro-oxidation
#16
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
#17
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
#18
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
#19
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
#20
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
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