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https://www.readbyqxmd.com/read/28092831/dft-study-on-the-chemical-sensing-properties-of-b24n24-nanocage-toward-formaldehyde
#1
Zahra Rostami, Mansoureh Pashangpour, Reza Moradi
It has been previously shown that the toxic formaldehyde gas (H2CO) cannot be detected by pristine BC2N, carbon, and BN nanotubes, BC3 nanosheet and graphene. Herein, density functional theory calculations were employed to investigate the electronic and structural behavior of a pristine B24N24 nanocluster toward H2CO molecules. It was found that [4,6] BN bonds of the nanocluster are the most favorable sites for the H2CO adsorption, compared to the [4,8], and [6,8] ones. When an H2CO molecule is adsorbed on a [4,6] BN bond, an energy of about 16...
December 26, 2016: Journal of Molecular Graphics & Modelling
https://www.readbyqxmd.com/read/28092766/effect-of-multi-walled-carbon-nanotubes-on-phytotoxicity-of-sediments-contaminated-by-phenanthrene-and-cadmium
#2
Biao Song, Guangming Zeng, Jilai Gong, Peng Zhang, Jiaqin Deng, Canhui Deng, Jin Yan, Piao Xu, Cui Lai, Chen Zhang, Min Cheng
To implement effective control and abatement programs for contaminants accumulating in sediments, strategies are needed for evaluating the quality of amended sediments. In this study, phytotoxicity of the sediments contaminated by cadmium and phenanthrene was evaluated after in situ remediation with multi-walled carbon nanotubes (MWCNTs) as adsorbents. Adsorption experiments and measurement of aqueous concentrations of the contaminants in overlying water were used to investigate the remediation effectiveness from physical and chemical aspects...
January 9, 2017: Chemosphere
https://www.readbyqxmd.com/read/28092634/correlation-of-cation-distribution-with-the-hyperfine-and-magnetic-behaviour-of-ni0-3zn0-4co0-2cu0-1fe2o4-nanoparticles-and-their-microwave-absorption-properties-when-encapsulated-in-multi-walled-carbon-nanotubes
#3
Madhumita Dalal, Ayan Mallick, Jean-Marc Greneche, Dipankar Das, Pabitra K Chakrabarti
Nanocrystalline samples of Ni0.3Zn0.4Co0.2Cu0.1Fe2O4 (NZCCF) are prepared by a simple co-precipitation method. To obtain nanoparticles of different sizes, the as prepared sample is annealed at 400, 600, 800 and 1000 °C. Nanoparticles of the sample annealed at 600 °C are encapsulated in multi-walled carbon nanotubes (MWCNT). To confirm the crystallographic phase, x-ray diffraction (XRD) patterns are analyzed by the Rietveld method and cation distribution in A- and B-sites is estimated from the analysis. Occupancy of Zn(2+) ions in A-site and that of Fe(3+) ions in B-site increase with the increase of annealing temperature (T A) and lattice parameters lie within 8...
January 16, 2017: Journal of Physics. Condensed Matter: An Institute of Physics Journal
https://www.readbyqxmd.com/read/28092389/a-new-method-for-developing-defect-rich-graphene-nanoribbons-onion-like-carbon-co-nanoparticles-hybrid-materials-as-an-excellent-catalyst-for-oxygen-reactions
#4
Wenxiu Yang, Lulu Chen, Xiangjian Liu, Jianbo Jia, Shaojun Guo
Herein, a novel material with an excellent electrocatalytic activity for the oxygen reduction reaction (ORR), composed of onion-like carbon@Co nanoparticles (NPs) incorporated on defect-rich N-doped graphene nanoribbons (C@Co-NGR), is prepared via a combination of nitric acid etching and subsequent high-temperature treatment of the as-synthesized C@Co-N doped carbon nanotubes. The as-prepared C@Co-NGR exhibits excellent electrocatalytic activity for the ORR in 0.10 M KOH with a half-wave potential of 0.830 V (vs...
January 16, 2017: Nanoscale
https://www.readbyqxmd.com/read/28091668/effect-of-ammonia-on-chemical-vapour-deposition-and-carbon-nanotube-nucleation-mechanisms
#5
Clothilde A Eveleens, Alister J Page
Chemical vapour deposition (CVD) growth of carbon nanotubes is currently the most viable method for commercial-scale nanotube production. However, controlling the 'chirality', or helicity, of carbon nanotubes during CVD growth remains a challenge. Recent studies have shown that adding chemical 'etchants', such as ammonia and water, to the feedstock gas can alter the diameter and chirality of nanotubes produced with CVD. To date, this strategy for chirality control remains sub-optimal, since we have a poor understanding of how these etchants change the CVD and nucleation mechanisms...
January 16, 2017: Nanoscale
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
#6
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
#7
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
#8
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
#9
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
#10
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
#11
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
#12
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
#13
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
#14
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
#15
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
#16
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
#17
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
#18
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
#19
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
#20
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
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