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https://www.readbyqxmd.com/read/28088281/flow-injection-microfluidic-device-with-on-line-fluorescent-derivatization-for-the-determination-of-cr-iii-and-cr-vi-in-water-samples-after-solid-phase-extraction
#1
Guilong Peng, Qiang He, Ying Lu, Jing Huang, Jin-Ming Lin
In this paper, a rapid and simple method using magnetic multi-walled carbon nanotubes (MWCNTS), as a solid-phase extraction (SPE) sorbent, was successfully developed for extraction and preconcentration trace amounts of Cr(III) in water samples. The synthesized magnetic-MWCNTs nanocomposite was characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FT-IR), X-ray photoelectron spectroscopy (XPS) and X-ray diffraction (XRD). A rhodamine derivative (R1) was synthesized and characterized as a highly selective and sensitive fluorescent derivatizing agent for Cr(III)...
February 22, 2017: Analytica Chimica Acta
https://www.readbyqxmd.com/read/28088119/composite-films-of-metal-doped-cos-carbon-allotropes-efficient-electrocatalyst-counter-electrodes-for-high-performance-quantum-dot-sensitized-solar-cells
#2
Seyede Sara Khalili, Hossein Dehghani, Malihe Afrooz
This study reports the enhanced catalytic ability of metal ions-doped CoS and CoS/carbon allotrope counter electrodes (CEs) (synthesized using a successive ionic layer adsorption and reaction (SILAR) method) to improve the power conversion efficiency (η) in quantum dot-sensitized solar cells (QDSSCs). Firstly, doping effects of different metal ions (Mg(2+), Ca(2+), Sr(2+) and Ba(2+)) in the CoS CE on the QDSSCs performance have been investigated. Overall, among the different metal doped CoS CEs, the best energy conversion efficiency of 2...
January 5, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28088004/a-catechin-nanoformulation-inhibits-wm266-melanoma-cell-proliferation-migration-and-associated-neo-angiogenesis
#3
Nicoletta di Leo, Matteo Battaglini, Liron Berger, Martina Giannaccini, Luciana Dente, Silke Hampel, Orazio Vittorio, Giuseppe Cirillo, Vittoria Raffa
We validated the anticancer potential of a nanoformulation made by (+)-catechin, gelatin and carbon nanotubes in terms of inhibition of cancer cell proliferation, migration and associated neo-angiogenesis. Gelatin was selected to stabilize the catechin without compromising its anti-oxidant potential and the carbon nanotubes were used to increase its intracellular bioavailability. The anticancer potential of the resulting nanohybrid was validated on an aggressive melanoma cell line, in vitro and in zebrafish xenotransplants...
January 11, 2017: European Journal of Pharmaceutics and Biopharmaceutics
https://www.readbyqxmd.com/read/28081361/microbial-transformation-of-multi-walled-carbon-nanotubes-by-mycobacterium-vanbaalenii-pyr-1
#4
Yaqi You, Kamol K Das, Huiyuan Guo, Che-Wei Chang, Maria Navas-Moreno, James W Chan, Paul Verburg, Simon R Poulson, Xilong Wang, Baoshan Xing, Yu Yang
Carbonaceous nanomaterials are widely used in industry and consumer products, but concerns have been raised regarding their release into the environment and subsequent impacts on ecosystems and human health. Although many efforts have been devoted to understanding the environmental fate of carbonaceous nanomaterials, information about their microbial transformation is still rare. In this study, we found that within 1 month a polycyclic aromatic hydrocarbon-degrading bacterium, Mycobacterium vanbaalenii PYR-1, was able to degrade both pristine and carboxyl-functionalized multi-walled carbon nanotubes (p-MWCNT and c-MWCNT), as demonstrated by consistent results from high resolution transmission electron microscopy, Raman spectroscopy, and confocal Raman microspectroscopy...
January 12, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28081255/changes-in-dna-methylation-in-mouse-lungs-after-a-single-intra-tracheal-administration-of-nanomaterials
#5
Ali M Tabish, Katrien Poels, Hyang-Min Byun, Katrien Luyts, Andrea A Baccarelli, Johan Martens, Stef Kerkhofs, Sven Seys, Peter Hoet, Lode Godderis
AIMS: This study aimed to investigate the effects of nanomaterial (NM) exposure on DNA methylation. METHODS AND RESULTS: Intra-tracheal administration of NM: gold nanoparticles (AuNPs) of 5-, 60- and 250-nm diameter; single-walled carbon nanotubes (SWCNTs) and multi-walled carbon nanotubes (MWCNTs) at high dose of 2.5 mg/kg and low dose of 0.25 mg/kg for 48 h to BALB/c mice. Study showed deregulations in immune pathways in NM-induced toxicity in vivo. NM administration had the following DNA methylation effects: AuNP 60 nm induced CpG hypermethylation in Atm, Cdk and Gsr genes and hypomethylation in Gpx; Gsr and Trp53 showed changes in methylation between low- and high-dose AuNP, 60 and 250 nm respectively, and AuNP had size effects on methylation for Trp53...
2017: PloS One
https://www.readbyqxmd.com/read/28080022/single-wall-carbon-nanotubes-doping-in-lead-acid-batteries-a-new-horizon
#6
Anjan Banerjee, Baruch Ziv, Yuliya Shilina, Elena Levi, Shalom Luski, Doron Aurbach
The addition of single-wall carbon nanotubes (SWCNT) to lead-acid battery electrodes is the most efficient suppresser of uncontrolled sulfation processes. Due to the cost of SWCNT, we studied the optimization loading of SWCNT in lead-acid batteries electrodes. We optimized the SWCNT loading concentrations in both the positive and negative plates, separately. Loadings of 0.01% and 0.001% in the positive and negative active masses were studied, respectively. Two volts of lead-acid laboratory cells with sulfuric acid, containing silica gel-type electrolytes, were cycled in a 25% and 50% depth-of-discharge (DOD) cycling with a charging rate of C and 2C, respectively, and discharge rates of C/2 and C, respectively...
January 12, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28080021/an-ionic-liquid-as-interface-linker-for-tuning-piezoresistive-sensitivity-and-toughness-in-poly-vinylidene-fluoride-carbon-nanotube-composites
#7
Kai Ke, Petra Potschke, Shanglin Gao, Brigitte Voit
Conductive polymer nanocomposites (CPNCs) have emerged as potential alternatives for metallic foil sensors and semiconductor strain gauges. The simultaneous achievement of high piezoresistive sensitivity and large strain ranges for CPNCs currently presents a great challenge, possibly extending the applications of CPNCs with self-diagnosis capabilities to many structural health monitoring (SHM) systems. Here, we report a facile strategy for fabricating highly piezoresistive and tough poly (vinylidene fluoride) (PVDF) based CPNCs by tuning the interactions between the polymer matrix and multi-walled carbon nanotubes (CNT) using an ionic liquid (IL) as an interface linker/modifier...
January 12, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28079983/stretchable-fiber-supercapacitors-with-high-volumetric-performance-based-on-buckled-mno2-oxidized-carbon-nanotube-fiber-electrodes
#8
Mingyang Li, Mei Zu, Jinshan Yu, Haifeng Cheng, Qingwen Li
A stretchable fiber supercapacitor (SC) based on buckled MnO2 /oxidized carbon nanotube (CNT) fiber electrode is fabricated by a simple prestraining-then-buckling method. The prepared stretchable fiber SC has a specific volumetric capacitance up to 409.4 F cm(-3) , which is 33 times of the pristine CNT fiber based SC, and shows the outstanding stability and repeatability in performance as stretchable SC.
January 12, 2017: Small
https://www.readbyqxmd.com/read/28078805/three-dimensional-mos2-cnt-rgo-network-composites-for-high-performance-flexible-supercapacitors
#9
Shouzhi Wang, Jiayan Zhu, Yongliang Shao, Weiran Li, Yongzhong Wu, Xiaopeng Hao
Two-dimensional atomically thick materials, reduced graphene oxide (RGO) and layered molybdenum disulphide (MoS2) have been potentially investigated as novel energy storage materials because of their distinct physicochemical properties. However, these materials suffer from rapid capacity decay and low rate capability. This study describes a facile binder-free approach to fabricate large-scale 3D network structure MoS2@carbon nanotube (CNT)/RGO composites for application in flexible supercapacitor devices. The as-obtained composites possess a hierarchical porosity and an interconnected framework...
January 11, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28078802/evaluation-of-pva-biodegradable-electric-conductive-membranes-for-nerve-regeneration-in-axonotmesis-injuries-the-rat-sciatic-nerve-animal-model
#10
J Ribeiro, A R Caseiro, T Pereira, Pas Armada-da-Silva, I Pires, J Prada, I Amorim, I Leal Reis, S Amado, J D Santos, S Bompasso, S Raimondo, Asp Varejão, S Geuna, A L Luís, A C Maurício
The therapeutic effect of three polyvinyl alcohol (PVA) membranes loaded with electrically conductive materials - carbon nanotubes (PVA-CNTs) and polypyrrole (PVA-PPy) - were tested in vivo for neuro-muscular regeneration after an axonotmesis injury in the rat sciatic nerve. The membranes electrical conductivity measured was 1.5±0.5x10(-6) S/m, 579±0.6x10(-6) S/m, and 1837.5±0.7 x10(-6) S/m, respectively. At week-12, a residual motor and nociceptive deficit were present in all treated groups, but at week-12, a better recovery to normal gait pattern of the PVA-CNTs and PVA-PPy treated groups was observed...
January 12, 2017: Journal of Biomedical Materials Research. Part A
https://www.readbyqxmd.com/read/28078719/carbon-nanotube-supported-bio-inspired-nickel-catalyst-and-its-integration-in-hybrid-hydrogen-air-fuel-cells
#11
Solène Gentil, Noémie Lalaoui, Arnab Dutta, Yannig Nedellec, Serge Cosnier, Wendy J Shaw, Vincent Artero, Alan Le Goff
A biomimetic nickel bis-diphosphine complex incorporating the amino acid arginine in the outer coordination sphere was immobilized on modified carbon nanotubes (CNTs) through electrostatic interactions. The functionalized redox nanomaterial exhibits reversible electrocatalytic activity for the H2 /2 H(+) interconversion from pH 0 to 9, with catalytic preference for H2 oxidation at all pH values. The high activity of the complex over a wide pH range allows us to integrate this bio-inspired nanomaterial either in an enzymatic fuel cell together with a multicopper oxidase at the cathode, or in a proton exchange membrane fuel cell (PEMFC) using Pt/C at the cathode...
January 12, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28076883/in-vivo-feasibility-test-using-transparent-carbon-nanotube-coated-polydimethylsiloxane-sheet-at-brain-tissue-and-sciatic-nerve
#12
Caifeng Wang, Sangjin Oh, Hyun Ah Lee, Jieun Kang, Ki-Jae Jeong, Seon Woo Kang, Dae Youn Hwang, Jaebeom Lee
Carbon nanotubes (CNTs), with their unique and outstanding properties, such as strong mechanical strength and high electrical conductivity, have become very popular for the repair of tissues, particularly for those requiring electrical stimuli. Polydimethylsiloxane (PDMS)-based elastomers have been used in a wide range of biomedical applications because of their optical transparency, physiological inertness, blood compatibility, non-toxicity, and gas permeability. In present study, most of artificial nerve guidance conduits (ANGCs) are not transparent...
January 11, 2017: Journal of Biomedical Materials Research. Part A
https://www.readbyqxmd.com/read/28075593/formation-of-nickel-clusters-wrapped-in-carbon-cages-towards-new-endohedral-metallofullerene-synthesis
#13
Alexander S Sinitsa, Thomas W Chamberlain, Thilo Zoberbier, Irina V Lebedeva, Andrey M Popov, Andrey A Knizhnik, Robert L McSweeney, Johannes Biskupek, Ute Kaiser, Andrei N Khlobystov
In spite of the high potential of endohedral metallofullerenes (EMFs) for application in biology, medicine and molecular electronics and recent efforts in EMF synthesis, the variety of EMFs accessible by conventional synthetic methods remains limited and does not include, for example, EMFs of late transition metals. We propose a method in which EMF formation is initiated by electron irradiation in aberration-corrected high-resolution transmission electron spectroscopy (AC-HRTEM) of a metal cluster surrounded by amorphous carbon inside a carbon nanotube serving as a nano-reactor and apply this method for synthesis of nickel EMFs...
January 11, 2017: Nano Letters
https://www.readbyqxmd.com/read/28075065/sulfur-immobilized-activated-porous-carbon-nanotube-composite-based-cathodes-for-lithium-sulfur-batteries
#14
Jun Seop Lee, Jaemoon Jun, Jyongsik Jang, Arumugam Manthiram
Activated highly porous carbon nanotubes are synthesized with a facile dual-nozzle co-electrospinning and a redox process to apply the framework of sulfur-immobilized composite as a high-performance cathode in lithium-sulfur batteries.
January 11, 2017: Small
https://www.readbyqxmd.com/read/28075060/self-templated-synthesis-of-co-and-n-doped-carbon-microtubes-composed-of-hollow-nanospheres-and-nanotubes-for-efficient-oxygen-reduction-reaction
#15
Sung Hoon Ahn, Arumugam Manthiram
A facile, self-templated strategy for the synthesis of Co- and N-doped carbon microtubular structures composed of nanoscale hollow spheres and nanotubes is proposed. Cobalt oxalate microtubes serve simultaneously as the solid cobalt precursor for the in situ conversion reaction to metal-organic framework and self-templates for the 1D tubular structure.
January 11, 2017: Small
https://www.readbyqxmd.com/read/28075054/inkjet-printed-lithium-sulfur-microcathodes-for-all-printed-integrated-nanomanufacturing
#16
Craig A Milroy, Seonpil Jang, Toshihiko Fujimori, Ananth Dodabalapur, Arumugam Manthiram
Improved thin-film microbatteries are needed to provide appropriate energy-storage options to power the multitude of devices that will bring the proposed "Internet of Things" network to fruition (e.g., active radio-frequency identification tags and microcontrollers for wearable and implantable devices). Although impressive efforts have been made to improve the energy density of 3D microbatteries, they have all used low energy-density lithium-ion chemistries, which present a fundamental barrier to miniaturization...
January 11, 2017: Small
https://www.readbyqxmd.com/read/28074964/how-the-alignment-of-adsorbed-ortho-h-pairs-determines-the-onset-of-selective-carbon-nanotube-etching
#17
U Khalilov, A Bogaerts, B Xu, T Kato, T Kaneko, E C Neyts
Unlocking the enormous technological potential of carbon nanotubes strongly depends on our ability to specifically produce metallic or semiconducting tubes. While selective etching of both has already been demonstrated, the underlying reasons, however, remain elusive as yet. We here present computational and experimental evidence on the operative mechanisms at the atomic scale. We demonstrate that during the adsorption of H atoms and their coalescence, the adsorbed ortho hydrogen pairs on single-walled carbon nanotubes induce higher shear stresses than axial stresses, leading to the elongation of HC-CH bonds as a function of their alignment with the tube chirality vector, which we denote as the γ-angle...
January 11, 2017: Nanoscale
https://www.readbyqxmd.com/read/28074956/tunable-superapolar-lotus-to-rose-hierarchical-nanosurfaces-via-vertical-carbon-nanotubes-driven-electrohydrodynamic-lithography
#18
Chiara Busà, Jonathan James Stanley Rickard, Eugene Chun, Yaw Chong, Viroshan Navaratnam, Pola Goldberg Oppenheimer
The development of a robust, cost-effective, scalable and simple technique that enables the design and construction of well-controlled large area superhydrophobic surface structures which can be easily tuned from lotus-leaf to rose-petal state is essential to enable progress in realising the full applied potential of such surfaces. In this study, we introduce the tuneable carbon nanotubes-based electrohydrodynamic lithography (CNT-EHL) to fabricate unique multiscale structured cones and nanohair-like architectures with various periodicities and dimensions, successfully enabling surface energy minimization...
January 11, 2017: Nanoscale
https://www.readbyqxmd.com/read/28074877/microwave-synthesized-freestanding-iron-carbon-nanotubes-on-polyester-composites-of-woven-kevlar-fibre-and-silver-nanoparticle-decorated-graphene
#19
Ankita Hazarika, Biplab K Deka, DoYoung Kim, Kyungil Kong, Young-Bin Park, Hyung Wook Park
We synthesized Ag nanoparticle-decorated multilayered graphene nanosheets (Ag-graphene) from graphite nanoplatelets and silver nitrate through 90-100 s of microwave exposure, without the use of any mineral acids or harsh reducing agents. Fe nanoparticle-decorated carbon nanotubes (Fe-CNTs) were grown on polypyrrole (PPy) deposited on woven Kevlar fibre (WKF), using ferrocene as a catalyst, under microwave irradiation. Fe-CNTs grown on WKF and Ag-graphene dispersed in polyester resin (PES) were combined to fabricate Ag-graphene/Fe-CNT/PPy-coated WKF/PES composites by vacuum-assisted resin transfer moulding...
January 11, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28074847/nitrogen-doped-porous-carbon-monoliths-from-polyacrylonitrile-pan-and-carbon-nanotubes-as-electrodes-for-supercapacitors
#20
Yanqing Wang, Bunshi Fugetsu, Zhipeng Wang, Wei Gong, Ichiro Sakata, Shingo Morimoto, Yoshio Hashimoto, Morinobu Endo, Mildred Dresselhaus, Mauricio Terrones
Nitrogen-doped porous activated carbon monoliths (NDP-ACMs) have long been the most desirable materials for supercapacitors. Unique to the conventional template based Lewis acid/base activation methods, herein, we report on a simple yet practicable novel approach to production of the three-dimensional NDP-ACMs (3D-NDP-ACMs). Polyacrylonitrile (PAN) contained carbon nanotubes (CNTs), being pre-dispersed into a tubular level of dispersions, were used as the starting material and the 3D-NDP-ACMs were obtained via a template-free process...
January 11, 2017: Scientific Reports
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