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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
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
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
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)
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)
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
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
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
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
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
Sureshkumar Kempahanumakkagari, Akash Deep, Ki-Hyun Kim, Suresh Kumar Kailasa, Hye-On Yoon
The existence of arsenic in the environment poses severe global health threats. Considering its toxicity, the sensing of arsenic is extremely important. Due to the complexity of environmental and biological samples, many of the available detection methods for arsenic have serious limitations on selectivity and sensitivity. To improve sensitivity and selectivity and to circumvent interferences, different electrode systems have been developed based on surface modification with nanomaterials including carbonaceous nanomaterials, metallic nanoparticles (MNPs), metal nanotubes (MNTs), and even enzymes...
April 13, 2017: Biosensors & Bioelectronics
Tao Cheng, Baozhi Yu, Linli Cao, Huiyun Tan, Xinghua Li, Xinliang Zheng, Weilong Li, Zhaoyu Ren, Jinbo Bai
The ternary composite electrodes, nitrogen-doped graphene foam/carbon nanotube/manganese dioxide (NGF/CNT/MnO2), have been successfully fabricated via chemical vapor deposition (CVD) and facile hydrothermal method. The morphologies of the MnO2 nanoflakes presented the loading-dependent characteristics and the nanoflake thickness could also be tuned by MnO2 mass loading in the fabrication process. The correlation between their morphology and electrochemical performance was systematically investigated by controlling MnO2 mass loading in the ternary composite electrodes...
April 18, 2017: Journal of Colloid and Interface Science
Ning Yang, Meng Li, Jörg Patscheider, Seul Ki Youn, Hyung Gyu Park
A precise control of the dimension of carbon nanotubes (CNTs) in their vertical array could enable many promising applications in various fields. Here, we demonstrate the growth of vertically aligned, single-walled CNTs (VA-SWCNTs) with diameters in the sub-1.5-nm range (0.98 ± 0.24 nm), by engineering a catalyst support layer of alumina via thermal annealing followed by ion beam treatment. We find out that the ion beam bombardment on the alumina allows the growth of ultra-narrow nanotubes, whereas the thermal annealing promotes the vertical alignment at the expense of enlarged diameters; in an optimal combination, these two effects can cooperate to produce the ultra-narrow VA-SWCNTs...
April 21, 2017: Scientific Reports
Hong Li, Xiutong Wang, Qinyi Wei, Xueqing Liu, Zhouhai Qian, Baorong Hou
Ag and graphene co-sensitized TiO2 composites were successfully fabricated and used as photoanodes for photogenerated cathodic protection of 304 stainless steel (304SS) under visible light. Graphene films was firstly deposited onto the TiO2 nanotube (NT) films via cyclic voltammetric electrodeposition. Ag/graphene/TiO2 films were then fabricated via dipping and photoreduction method. The morphology, composition and optical response of the Ag/graphene/TiO2 NT composites were characterized by scanning electron microscopy, X-ray diffraction, X-ray photoelectron spectroscopy, UV-vis diffusion reflectance spectroscopy, respectively...
April 21, 2017: Nanotechnology
Lin Jing, Majid Kabiri Samani, Bo Liu, Hongling Li, Roland Yingjie Tay, Siu Hon Tsang, Olivier Cometto, Andreas Nylander, Johan Liu, Edwin Hang Tong Teo, Alfred Iing Yoong Tok
We demonstrate the thermal conductivity enhancement of the vertically aligned carbon nanotube (CNT) arrays (from ~15.5 to 29.5 W/mK, ~90% increase) by encapsulating outer boron nitride nanotube (BNNT, 0.97 nm-thick with ~3-4 walls). The heat transfer enhancement mechanism of the coaxial C@BNNT was further revealed by molecular dynamics simulations. Owing to their highly coherent lattice structures, the outer BNNT serves as additional heat conducting path without impairing the thermal conductance of inner CNT...
April 21, 2017: ACS Applied Materials & Interfaces
Chang Lu, Zhicheng Huang, Biwu Liu, Yibo Liu, Yibin Ying, Juewen Liu
Attaching DNA to nanomaterials is the basis for DNA-directed assembly, sensing, and drug delivery using such hybrid materials. Poly-cytosine (poly-C) DNA is a high affinity ligand for four types of commonly used nanomaterials, including nanocarbons (graphene oxide and single-walled carbon nanotubes), transition metal dichalcogenides (MoS2 and WS2 ), metal oxides (Fe3 O4 and ZnO), and metal nanoparticles (Au and Ag). Compared to other homo-DNA sequences, poly-C DNA has the highest affinity for the first three types of materials...
April 21, 2017: Angewandte Chemie
Zhirong Sun, Xiaoyue Ma, Xiang Hu
Palladium/carbon nanotubes-nafion film-modified titanium mesh electrode (Pd/CNTs-nafion film/Ti electrode) was prepared and used for catalytic dechlorination of 2,3,5-trichlorophenol (2,3,5-TCP). The influences of factors, such as Pd(2+) concentration, plating solution pH, and electrodeposition time and current, on the preparation of the electrode were studied by cyclic voltammetry (CV) to establish the optimal electrode preparation conditions. Additionally, the CV results highlighted that the addition of the CNTs-nafion film could enhance the electrochemical performance of the electrode...
April 21, 2017: Environmental Science and Pollution Research International
Hyacinthe Randriamahazaka, Kinji Asaka
We investigate the electromechanical properties of bucky-gel electrochemical actuators incorporating various amounts of single-walled carbon nanotubes and an ionic liquid electrolyte, 1-butyl-3-methylimidazolium tetrafluoroborate, that are able to convert electrochemical energy into mechanical energy. The interplay between mechanical and electrochemical effects is studied. The electromechanical responses are investigated by means of electrochemical impedance spectroscopy and bending displacement measurements...
April 21, 2017: Faraday Discussions
Xiaoqin Yu, Dan Liu, Lixing Kang, Yi Yang, Xiaopin Zhang, Qianjin Lv, Song Qiu, Hehua Jin, Qijun Song, Jin Zhang, Qingwen Li
High-purity semiconducting single-walled carbon nanotubes (s-SWNTs) can be obtained by conjugated polymer wrapping. However, further purification of sorted s-SWNTs and high costs of raw materials is still a challenge to practical applications. It is inevitable that a lot of polymers still cover the surface of s-SWNTs after separation, and the cost of polymer is relative too high than SWNTs. Here, we demonstrated a facile isolated process to improve the quality of s-SWNTs solutions and films significantly. Compared with the untreated s-SWNTs, the contact resistance between the s-SWNT and the electrode is reduced by 20 times, and the thin-film transistors shows 300% enhancement of current density...
April 20, 2017: ACS Applied Materials & Interfaces
Alan Luna, Mickael Pruvost, Jinkai Yuan, Cécile Zakri, Wilfrid Neri, Cecile Monteux, Philippe Poulin, Annie Colin
Using an emulsion road and optimizing the dispersion process, we prepare polymer carbone nanotubes (CNT) and polymer reduced graphene oxyde (rGO) composites. The introduction of conductive nanoparticles into polymer matrices modifies the electronic properties of the material. We show that these materials exhibit giant electrostriction coefficient in the intermediate filler concentration (below 1wt %). This makes them very promising for applications including such as capacitive sensors and actuators. In addition, the values of the piezoresistivity measured in the high filler concentration situation, are at least an order of magnitude greater than the one reported in the literature...
April 20, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
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