keyword
MENU ▼
Read by QxMD icon Read
search

carbon nanotube

keyword
https://www.readbyqxmd.com/read/28448120/structural-properties-of-double-walled-carbon-nanotubes-driven-by-mechanical-interlayer-coupling
#1
Ahmed Ghedjatti, Yann Magnin, Frédéric Fossard, Guillaume Wang, Hakim Amara, Emmanuel Flahaut, Jean-Sebastien Lauret, Annick Loiseau
Structural identification of double-walled carbon nanotubes (DWNT) is presented through a robust procedure based on the latest generation of transmission electron microscope, making possible a statistical analysis based on numerous nano-objects. This approach reveals that inner and outer tubes of DWNTs are not randomly oriented, suggesting the existence of a mechanical coupling between the two concentric walls. With the support of atomic-scale modeling, we attribute it to the presence of incommensurate domains whose structures depend on the diameters and helicities of both tubes, and where inner tubes try to achieve a local stacking orientation to reduce strain effects...
April 27, 2017: ACS Nano
https://www.readbyqxmd.com/read/28447459/fast-torsional-artificial-muscles-from-niti-twisted-yarns
#2
Seyed M Mirvakili, Ian W Hunter
Torsional artificial muscles made of multi-walled carbon nanotube/niobium nanowire yarns have shown remarkable torsional speed and gravimetric torque. The muscle structure consists of a twisted yarn with half of its length infiltrated with a stimuli-responsive guest material such as paraffin wax. The volumetric thermal expansion of the guest material creates the torsional actuation in the yarn. In the present work, we show that this actuation mechanism is not unique to MWCNT or niobium nanowire yarns and twisted yarn of NiTi alloy fibers also produces fast torsional actuation...
April 27, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28447396/carbon-nanotubes-accelerate-methane-production-in-pure-cultures-of-methanogens-and-in-a-syntrophic-coculture
#3
Andreia F Salvador, Gilberto Martins, Manuel Melle-Franco, Ricardo Serpa, Alfons J M Stams, Ana J Cavaleiro, M Alcina Pereira, M Madalena Alves
Carbon materials have been reported to facilitate direct interspecies electron transfer (DIET) between bacteria and methanogens improving methane production in anaerobic processes. In this work, the effect of increasing concentrations of carbon nanotubes (CNT) on the activity of pure cultures of methanogens and on typical fatty acid-degrading syntrophic methanogenic coculture was evaluated. CNT affected methane production by methanogenic cultures, although acceleration was higher for hydrogenotrophic methanogens than for acetoclastic methanogens or syntrophic coculture...
April 26, 2017: Environmental Microbiology
https://www.readbyqxmd.com/read/28446781/inkjet-printing-of-high-performance-transistors-with-micron-order-chemically-set-gaps
#4
Peter Mack Grubb, Harish Subbaraman, Saungeun Park, Deji Akinwande, Ray T Chen
This paper reports a 100% inkjet printed transistor with a short channel of approximately 1 µm with an operating speed up to 18.21 GHz. Printed electronics are a burgeoning area in electronics development, but are often stymied by the large minimum feature size. To combat this, techniques were developed to allow for the printings of much shorter transistor channels. The small gap size is achieved through the use of silver inks with different chemical properties to prevent mixing. The combination of the short channel and semiconducting carbon nanotubes (CNT) allows for an exceptional experimentally measured on/off ratio of 10(6)...
April 26, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28444700/fluorescence-lifetime-imaging-and-super-resolution-microscopies-shed-light-on-the-directed-and-self-assembly-of-functional-porphyrins-onto-carbon-nanotubes-and-flat-surfaces
#5
Boyang Mao, David González Calatayud, Vincenzo Mirabello, Haobo Ge, Benjamin J Hodges, Robert M J Jacobs, Ashley M Shepherd, José Alberto Ribeiro Martins, Navaratnarajah Kuganathan, Jorge Bernardino De La Serna, Stanley W Botchway, Sofia Ioana Pascu
Two new routes to functionalized SWNTs have been established using a bulky Zn(II)-porphyrin featuring thiolate groups at the periphery. We probed the optical properties of this Zinc(II)-substituted, bulky aryl porphyrin and those of the corresponding new nano-composites with single walled carbon nanotube (SWNTs) and coronene, as a model for graphene. We report hereby on: (i) the supramolecular interactions between the pristine SWNTs and Zn(II)-porphyrin by virtue of π-π stacking, and (ii) a novel covalent binding strategy based on the Bingel reaction...
April 25, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28444473/contrasting-effects-of-engineered-carbon-nanotubes-on-plants-a-review
#6
Meththika Vithanage, Mihiri Seneviratne, Mahtab Ahmad, Binoy Sarkar, Yong Sik Ok
Rapid surge of interest for carbon nanotube (CNT) in the last decade has made it an imperative member of nanomaterial family. Because of the distinctive physicochemical properties, CNTs are widely used in a number of scientific applications including plant sciences. This review mainly describes the role of CNT in plant sciences. Contradictory effects of CNT on plants physiology are reported. CNT can act as plant growth inducer causing enhanced plant dry biomass and root/shoot lengths. At the same time, CNT can cause negative effects on plants by forming reactive oxygen species in plant tissues, consequently leading to cell death...
April 25, 2017: Environmental Geochemistry and Health
https://www.readbyqxmd.com/read/28440832/nanoemitters-and-innate-immunity-the-role-of-surfactants-and-bio-coronas-in-myeloperoxidase-catalyzed-oxidation-of-pristine-single-walled-carbon-nanotubes
#7
Cheuk Fai Chiu, Haider H Dar, Alexandr A Kapralov, Renã A S Robinson, Valerian E Kagan, Alexander Star
Single-walled carbon nanotubes (SWCNTs) are experimentally utilized in in vivo imaging and photothermal cancer therapy owing to their unique physicochemical and electronic properties. For these applications, pristine carbon nanotubes are often modified by polymer surfactant coatings to improve their biocompatibility, adding more complexity to their recognition and biodegradation by immuno-competent cells. Here, we investigate the oxidative degradation of SWCNTs catalyzed by neutrophil myeloperoxidase (MPO) using bandgap near-infrared (NIR) photoluminescence and Raman spectroscopy...
April 25, 2017: Nanoscale
https://www.readbyqxmd.com/read/28440825/radio-frequency-negative-permittivity-in-random-carbon-nanotubes-alumina-nanocomposites
#8
Chuanbing Cheng, Runhua Fan, Yanrong Ren, Tao Ding, Lei Qian, Jiang Guo, Xiaofeng Li, Liqiong An, Yanhua Lei, Yansheng Yin, Zhanhu Guo
While metal is the most common conductive constituent element in the preparation of metamaterials, one-dimensional conductive carbon nanotubes (CNTs) provide alternative building blocks. Here alumina (Al2O3) nanocomposites with multi-walled carbon nanotubes (MWCNTs) uniformly dispersed in the alumina matrix were prepared by hot-pressing sintering. As the MWCNT content increased, the formed conductive MWCNT networks led to the occurrence of the percolation phenomenon and a change of the conductive mechanism...
April 25, 2017: Nanoscale
https://www.readbyqxmd.com/read/28439553/maximizing-the-performance-of-photothermal-actuators-by-combining-smart-materials-with-supplementary-advantages
#9
Tongyu Wang, David Torres, Félix E Fernández, Chuan Wang, Nelson Sepúlveda
The search for higher-performance photothermal microactuators has typically involved unavoidable trade-offs that hinder the demonstration of ubiquitous devices with high energy density, speed, flexibility, efficiency, sensitivity, and multifunctionality. Improving some of these parameters often implies deterioration of others. Photothermal actuators are driven by the conversion of absorbed optical energy into thermal energy, which, by different mechanisms, can produce mechanical displacement of a structure...
April 2017: Science Advances
https://www.readbyqxmd.com/read/28438490/acute-nanoparticle-exposure-to-vocal-folds-a-laboratory-study
#10
Xinxin Liu, Tanaya Walimbe, William Pierre Schrock, Wei Zheng, M Preeti Sivasankar
OBJECTIVES: Airway exposure to nanoparticles is common in occupational settings. Inhaled nanoparticles have toxic effects on respiratory tissue. Vocal folds are also at direct risk from inhaled nanoparticles. This study investigated the effects of single-walled carbon nanotubes (SWCNT), a type of nanoparticle, on vocal fold epithelium and fibroblasts. These cell types were selected for study as the epithelium is the outer layer of the vocal folds and fibroblasts are the most common cell type in connective tissue underlying the epithelium...
April 21, 2017: Journal of Voice: Official Journal of the Voice Foundation
https://www.readbyqxmd.com/read/28437255/capped-carbon-nanotubes-with-a-number-of-ground-state-magnetization-discontinuities-increasing-with-their-size
#11
N P Konstantinidis
The classical ground state magnetic response of fullerene molecules that resemble capped carbon nanotubes is calculated within the framework of the antiferromagnetic Heisenberg model. It is found that the magnetic response depends subtly on spatial symmetry and chirality. Clusters based on armchair carbon nanotubes which are capped with non-neighboring pentagons and have D 5d spatial symmetry have a number of magnetization discontinuities which increases with their size. This occurs even though the model completely lacks magnetic anisotropy, and even though the only source of frustration are the two groups of six pentagons located at the ends of the molecules, which become more strongly outnumbered as the clusters are filled in the middle with more unfrustrated hexagons with increasing size...
April 24, 2017: Journal of Physics. Condensed Matter: An Institute of Physics Journal
https://www.readbyqxmd.com/read/28437024/photon-pair-generation-with-a-100-nm-thick-carbon-nanotube-film
#12
Kim Fook Lee, Ying Tian, He Yang, Kimmo Mustonen, Amos Martinez, Qing Dai, Esko I Kauppinen, John Malowicki, Prem Kumar, Zhipei Sun
Nonlinear optics based on bulk materials is the current technique of choice for quantum-state generation and information processing. Scaling of nonlinear optical quantum devices is of significant interest to enable quantum devices with high performance. However, it is challenging to scale the nonlinear optical devices down to the nanoscale dimension due to relatively small nonlinear optical response of traditional bulk materials. Here, correlated photon pairs are generated in the nanometer scale using a nonlinear optical device for the first time...
April 24, 2017: Advanced Materials
https://www.readbyqxmd.com/read/28437022/-wiring-fe-nx-embedded-porous-carbon-framework-onto-1d-nanotubes-for-efficient-oxygen-reduction-reaction-in-alkaline-and-acidic-media
#13
Sung Hoon Ahn, Xingwen Yu, Arumugam Manthiram
This study presents a novel metal-organic-framework-engaged synthesis route based on porous tellurium nanotubes as a sacrificial template for hierarchically porous 1D carbon nanotubes. Furthermore, an ultrathin Fe-ion-containing polydopamine layer has been introduced to generate highly effective FeNx C active sites into the carbon framework and to induce a high degree of graphitization. The synergistic effects between the hierarchically porous 1D carbon structure and the embedded FeNx C active sites in the carbon framework manifest in superior catalytic activity toward oxygen reduction reaction (ORR) compared to Pt/C catalyst in both alkaline and acidic media...
April 24, 2017: Advanced Materials
https://www.readbyqxmd.com/read/28435781/carbon-nanotubes-in-tio2-nanofiber-photoelectrodes-for-high-performance-perovskite-solar-cells
#14
Munkhbayar Batmunkh, Thomas J Macdonald, Cameron J Shearer, Munkhjargal Bat-Erdene, Yun Wang, Mark J Biggs, Ivan P Parkin, Thomas Nann, Joseph G Shapter
1D semiconducting oxides are unique structures that have been widely used for photovoltaic (PV) devices due to their capability to provide a direct pathway for charge transport. In addition, carbon nanotubes (CNTs) have played multifunctional roles in a range of PV cells because of their fascinating properties. Herein, the influence of CNTs on the PV performance of 1D titanium dioxide nanofiber (TiO2 NF) photoelectrode perovskite solar cells (PSCs) is systematically explored. Among the different types of CNTs, single-walled CNTs (SWCNTs) incorporated in the TiO2 NF photoelectrode PSCs show a significant enhancement (≈40%) in the power conversion efficiency (PCE) as compared to control cells...
April 2017: Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
https://www.readbyqxmd.com/read/28435776/-self-peel-off-transfer-produces-ultrathin-polyvinylidene-fluoride-based-flexible-nanodevices
#15
Yanlong Tai, Gilles Lubineau
Here, a new strategy, self-peel-off transfer, for the preparation of ultrathin flexible nanodevices made from polyvinylidene-fluoride (PVDF) is reported. In this process, a functional pattern of nanoparticles is transferred via peeling from a temporary substrate to the final PVDF film. This peeling process takes advantage of the differences in the work of adhesion between the various layers (the PVDF layer, the nanoparticle-pattern layer and the substrate layer) and of the high stresses generated by the differential thermal expansion of the layers...
April 2017: Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
https://www.readbyqxmd.com/read/28435453/sirna-delivery-with-pegylated-graphene-oxide-nanosheets-for-combined-photothermal-and-genetherapy-for-pancreatic-cancer
#16
Feng Yin, Kuan Hu, Yangzi Chen, Mengying Yu, Dongyuan Wang, Qianqian Wang, Ken-Tye Yong, Fei Lu, Yongye Liang, Zigang Li
Since the successful exfoliation of graphene from graphite in 2004, graphene and graphene oxide (GO) have been considered the most promising two-dimensional (2D) nanomaterials with distinguished physical and chemical characteristics and have attracted great attention in many different fields. Graphene oxide is well-known for its distinct physiochemical properties and shows only minimal cytotoxicity compared to carbon nanotubes. Until now, only limited efforts have been invested in utilizing GO for gene therapy in pancreatic cancer treatments...
2017: Theranostics
https://www.readbyqxmd.com/read/28433707/genetic-susceptibility-to-toxicologic-lung-responses-among-inbred-mouse-strains-following-exposure-to-carbon-nanotubes-and-profiling-of-underlying-gene-networks
#17
Evan A Frank, Vinicius S Carreira, Kumar Shanmukhappa, Mario Medvedovic, Daniel R Prows, Jagjit S Yadav
The risk of human exposure to fiber nanoparticles has risen in recent years due to increases in the manufacture and utilization of carbon nanotubes (CNTs). CNTs are present as airborne particulates in occupational settings and their hazard potential has been demonstrated in experimental lung exposure studies using inbred mouse strains. However, it is not known whether different inbred strains differ in lung responses to CNTs by virtue of their genetics. In this work, common inbred strains (BALB/c, C57Bl/6, DBA/2, and C3H/He) were exposed to CNTs via oropharyngeal aspiration and lung histology and bronchoalveolar lavage (BAL) samples were evaluated over 28days with the objective of evaluating sensitivity/resistance among strains...
April 19, 2017: Toxicology and Applied Pharmacology
https://www.readbyqxmd.com/read/28433592/toxicity-assessment-of-multi-walled-carbon-nanotubes-on-cucurbita-pepo-l-under-well-watered-and-water-stressed-conditions
#18
Mehrnaz Hatami
The rapid increase in the production and application of various types of nanomaterials increases the possibility of their presence in total environment, which subsequently raises concerns about their potential threats to the first trophic level of organisms, specifically under varying environmental constraints. In this work, seeds of Cucurbita pepo L. were cultured in MS basal medium exposed to multi-walled carbon nanotubes (MWCNTs) at different concentrations (0, 125, 250, 500 and 1000μgmL(-1)) under two levels of water potential, well-watered (0MPa) and water stress (-1...
April 20, 2017: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/28433055/pyrenyl-carbon-nanostructures-for-ultrasensitive-measurements-of-formaldehyde-in-urine
#19
Gayan Premaratne, Sabrina Farias, Sadagopan Krishnan
Measurement of ultra-low (e.g., parts-per-billion) levels of small-molecule markers in body fluids (e.g., serum, urine, saliva) involves a considerable challenge in view of designing assay strategies with sensitivity and selectivity. Herein we report for the first time an amperometric nano-bioelectrode design that uniquely combines 1-pyrenebutyric acid units pi-pi stacked with carboxylated multiwalled carbon nanotubes on the surface of gold screen printed electrodes for covalent attachment of NAD(+) dependent formaldehyde dehydrogenase (FDH)...
June 1, 2017: Analytica Chimica Acta
https://www.readbyqxmd.com/read/28432330/enhanced-response-of-metformin-towards-the-cancer-cells-due-to-synergism-with-multi-walled-carbon-nanotubes-in-photothermal-therapy
#20
Sweejiang Yoo, Jin Hou, Wenhui Yi, Yingchun Li, Weiping Chen, Lingjie Meng, Jinhai Si, Xun Hou
Converging evidence from laboratory models pointed that the widely used antidiabetic drug metformin has direct effects on cancer cells. Thus far, relatively little attention has been addressed to the drug exposures used experimentally relative to those achievable clinically. Here, we demonstrated that metformin loaded on carbon nanotubes under near-infrared (NIR) irradiation led to the remarkably enhancement in response towards cancer cells. The dose of metformin has reduced to only 1/280 of typical doses in monotherapy (35: 10 000-30 000 µM) where the realization of metformin in conventional antidiabetic doses for cancer therapies becomes possible...
April 21, 2017: Scientific Reports
keyword
keyword
37498
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"