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Carbon nanotubes

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https://www.readbyqxmd.com/read/28241627/hybrid-q-switched-laser-with-mos-sub-2-sub-saturable-absorber-and-aom-driven-sub-nanosecond-ktp-opo
#1
Junpeng Qiao, Shengzhi Zhao, Kejian Yang, Jia Zhao, Guiqiu Li, Dechun Li, Tao Li, Wenchao Qiao
Two-dimensional (2D) materials, especially transition-metal dichalcogenides, such as molybdenum disulfide (MoS<sub>2</sub>) and tungsten disulfide (WS<sub>2</sub>), have attracted great interests due to their exceptional optical properties as saturable absorbers in laser systems. In this work, at first, we presented a diode-pumped passively Q-switched laser with MoS<sub>2</sub> saturable absorber (MoS<sub>2</sub>-SA). At an incident pump power of 6.54 W, a maximum output power of 1...
February 20, 2017: Optics Express
https://www.readbyqxmd.com/read/28241117/supported-microwires-for-electroanalysis-sensitive-amperometric-detection-of-reduced-glutathione
#2
Kamonwad Ngamchuea, Chuhong Lin, Christopher Batchelor-McAuley, Richard G Compton
A carbon microfiber (7 μm diameter) is employed herein as an electroanalytical sensor. The fabricated sensor is cheap, disposable and requires only 150 μL of samples. The carbon fiber is surface-mounted onto an inert surface to overcome the problems of the fragility of the microwire and the possible interference of convective force due to the non-rigid nature of the wires, as well as to improve the reproducibility in length and the amperometric responses. As the cylindrical electrode is supported on a surface, the diffusion of redox-active species to the electrode is partially blocked by the substrate...
February 27, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28240028/multidimensional-thin-film-hybrid-electrodes-with-mos2-multilayer-for-electrocatalytic-hydrogen-evolution-reaction
#3
Eungjin Ahn, Byeong-Su Kim
Hybrid electrodes are widely used in various energy storage and conversion devices. However, conventional fabrication methods like simple mixing allow only limited control over the internal electrode structure, and it is often difficult to elucidate the structure-property relationship among the electrode components. Taking advantage of the versatile layer-by-layer (LbL) assembly method, herein we report the preparation of electrocatalytic thin film electrodes for hydrogen evolution reaction (HER), highlighting the importance of nanoscale composition in multidimensional hybrid electrodes...
February 27, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28239719/electronic-properties-of-carbon-nanotubes-complexed-with-a-dna-nucleotide
#4
Morteza Chehelamirani, Maurício C da Silva, Dennis R Salahub
Electronic properties of carbon nanotubes (CNTs) play an important role in their interactions with nano-structured materials. In this work, interactions of adenosine monophosphate (AMP), a DNA nucleotide, with metallic and semi-conducting CNTs are studied using the density functional tight binding (DFTB) method. The electronic structure of semi-conducting CNTs was found to be changed as they turned to metallic CNTs in a vacuum upon interaction with the nucleotide while metallic CNTs remain metallic. Specifically, the band gap of semi-conducting CNTs was decreased by 0...
February 27, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28237750/different-cdsete-structure-determined-photoelectrocatalytic-reduction-performance-for-carbon-dioxide
#5
Wei Wei, Zhongxue Yang, Weijie Song, Fengyun Hu, Bo Luan, Peiqiang Li, Hongzong Yin
CdSeTe nanoparticles (CdSeTe NPs)/TiO2 nanotubes (TiO2 NTs) and CdSeTe nanosheets (CdSeTe NSs)/TiO2 NTs were fabricated by photoelectric deposition method and hydrothermal method, respectively. The band gap of the CdSeTe NPs/TiO2 NTs (1.24eV) is narrower than that of the CdSeTe NSs/TiO2NTs (1.48eV). The photoelectrochemical conversion efficiency of the CdSeTe NPs/TiO2 NTs is 2.72 times larger than that of the CdSeTe NSs/TiO2 NTs, manifesting that the CdSeTe NPs/TiO2 NTs possessed more excellent photocatalytic performance...
November 16, 2016: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28235378/synergistic-enhancement-of-the-percolation-threshold-in-hybrid-polymeric-nanocomposites-based-on-carbon-nanotubes-and-graphite-nanoplatelets
#6
I Sagalianov, L Vovchenko, L Matzui, O Lazarenko
Synergistic effect causes significant decreasing of the percolation threshold in the ternary polymer composites filled with carbon nanotubes (CNT) and graphite nanoplatelets (GNP) in comparison with binary ones. Enhancement of the percolation threshold strongly depends only on the relative aspect ratios of the filler particles due to the formation of the bridges between puddles of the different filler components. Conditions of both appearance and fading away of the synergistic effect are investigated depending on the relative morphology of CNT or GNP components of the filler...
December 2017: Nanoscale Research Letters
https://www.readbyqxmd.com/read/28230533/thermophoretic-transport-of-ionic-liquid-droplets-in-carbon-nanotubes
#7
Rakesh Rajegowda, Sridhar Kannam, Remco Hartkamp, Sarith P Sathian
Thermal-gradient induced transport of ionic liquid (IL) and water droplets through a carbon nanotube (CNT) is investigated in this study using molecular dynamics simulations. Energetic analysis indicates that IL transport through a CNT is driven primarily by the fluid-solid interaction, while fluid-fluid interactions dominate in water-CNT systems. Droplet diffusion analysis via the Moment Scaling Spectrum reveals sub-diffusive motion of the IL droplet, in contrast to the self-diffusive motion of the water droplet...
February 23, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28229946/multiwalled-carbon-nanotubes-for-drug-delivery-efficiency-related-to-length-and-incubation-time
#8
Niccolò Sciortino, Stefano Fedeli, Paolo Paoli, Alberto Brandi, Paola Chiarugi, Mirko Severi, Stefano Cicchi
Batches of oxidized multiwalled carbon nanotubes differing in length were adopted to prepare two drug delivery systems (DDS) loaded with doxorubicin. The different internalization of the two batches, verified by atomic emission spectroscopy onto cell lysates, was also confirmed by the different toxicity of the same DDS loaded with doxorubicin. In vitro experiments evidenced, after 48h of incubation, the superior efficacy of the shortest nanotubes. However, upon prolonging the incubation time up to 72h the difference in efficiency was minimized due to the spontaneous release of doxorubicin by the non-internalized long nanotubes...
February 13, 2017: International Journal of Pharmaceutics
https://www.readbyqxmd.com/read/28229537/high-temperature-stable-perovskite-solar-cell-based-on-low-cost-carbon-nanotube-hole-contact
#9
Kerttu Aitola, Konrad Domanski, Juan-Pablo Correa-Baena, Kári Sveinbjörnsson, Michael Saliba, Antonio Abate, Michael Grätzel, Esko Kauppinen, Erik M J Johansson, Wolfgang Tress, Anders Hagfeldt, Gerrit Boschloo
Mixed ion perovskite solar cells (PSC) are manufactured with a metal-free hole contact based on press-transferred single-walled carbon nanotube (SWCNT) film infiltrated with 2,2,7,-7-tetrakis(N,N-di-p-methoxyphenylamine)-9,90-spirobifluorene (Spiro-OMeTAD). By means of maximum power point tracking, their stabilities are compared with those of standard PSCs employing spin-coated Spiro-OMeTAD and a thermally evaporated Au back contact, under full 1 sun illumination, at 60 °C, and in a N2 atmosphere. During the 140 h experiment, the solar cells with the Au electrode experience a dramatic, irreversible efficiency loss, rendering them effectively nonoperational, whereas the SWCNT-contacted devices show only a small linear efficiency loss with an extrapolated lifetime of 580 h...
February 23, 2017: Advanced Materials
https://www.readbyqxmd.com/read/28229319/a-review-of-the-structure-and-dynamics-of-nanoconfined-water-and-ionic-liquids-via-molecular-dynamics-simulation
#10
REVIEW
Masumeh Foroutan, S Mahmood Fatemi, Farshad Esmaeilian
During the past decade, the research on fluids in nanoconfined geometries has received considerable attention as a consequence of their wide applications in different fields. Several nanoconfined systems such as water and ionic liquids, together with an equally impressive array of nanoconfining media such as carbon nanotube, graphene and graphene oxide have received increasingly growing interest in the past years. Water is the first system that has been reviewed in this article, due to its important role in transport phenomena in environmental sciences...
February 2017: European Physical Journal. E, Soft Matter
https://www.readbyqxmd.com/read/28228076/transdermal-drug-delivery-opportunities-and-challenges-for-controlled-delivery-of-therapeutic-agents-using-nanocarriers
#11
Balak Das Kurmi, Pawan Tekchandani, Rishi Paliwal, Shivani Rai Paliwal
BACKGROUND: Transdermal drug delivery represents an extremely attractive and innovative route across the skin owing to the possibility for achieving systemic effect of drugs. Present scenario demands a special focus on developing safe medicine with minimize toxic adverse effects related to most of the pharmacologically active agents. Transdermal drug delivery would be a focal paradigm which provides patient convenience, first-pass hepatic metabolism avoidance, local targeting and reduction in toxic effect related to various categories of drugs like, analgesics, anti-inflammatory, antibiotics, antiviral, anaesthetic, anticancer etc...
February 22, 2017: Current Drug Metabolism
https://www.readbyqxmd.com/read/28228035/a-molecular-dynamics-investigation-of-the-influence-of-water-structure-on-ion-conduction-through-a-carbon-nanotube
#12
L Liu, G N Patey
Molecular dynamics simulations are employed to investigate pressure-driven water and ion transport through a (9,9) carbon nanotube (CNT). We consider NaCl solutions modeled with both the TIP3P and TIP4P/2005 water models. Concentrations range from 0.25 to 2.8 mol l(-1) and temperatures from 260 to 320 K are considered. We discuss the influences on flow rates of continuum hydrodynamic considerations and molecular structural effects. We show that the flow rate of water, sodium, and chloride ions through the CNT is strongly model dependent, consistent with earlier simulations of pure water conduction...
February 21, 2017: Journal of Chemical Physics
https://www.readbyqxmd.com/read/28228017/adsorption-mechanism-of-an-antimicrobial-peptide-on-carbonaceous-surfaces-a-molecular-dynamics-study
#13
Danilo Roccatano, Edita Sarukhanyan, Ronen Zangi
Peptides are versatile molecules with applications spanning from biotechnology to nanomedicine. They exhibit a good capability to unbundle carbon nanotubes (CNT) by improving their solubility in water. Furthermore, they are a powerful drug delivery system since they can easily be uptaken by living cells, and their high surface-to-volume ratio facilitates the adsorption of molecules of different natures. Therefore, understanding the interaction mechanism between peptides and CNT is important for designing novel therapeutical agents...
February 21, 2017: Journal of Chemical Physics
https://www.readbyqxmd.com/read/28227919/novel-structure-of-carbon-nanotube-micro-electrode-for-high-resolution-stimulation-of-neurons
#14
Hua Xu, Leanne L H Chan, Amine Bermak, Hua Xu, Leanne L H Chan, Amine Bermak, Amine Bermak, Leanne L H Chan, Hua Xu
This paper proposes a novel method to fabricate high resolution flexible electrodes. Among the steps, the carbon nanotube (CNT) electrodes synthesized facing down shows impedance improvement of about 90 times comparing with the normal facing up synthesized samples. Meanwhile, section impedance of electrodes is also defined in this paper to compare the area efficiency of impedance between electrodes with different sizes. In addition and to the best of our knowledge, high performance electrodes embedded inside parylene is reported for the first time taking into consideration the hydrophobicity change of the CNT surface...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28227909/neuromorphic-circuit-modeling-directional-selectivity-in-the-visual-cortex
#15
Saeid Barzegarjalali, Alice C Parker, Saeid Barzegarjalali, Alice C Parker, Alice C Parker, Saeid Barzegarjalali
We have designed a neuromorphic circuit that models directional selectivity in the visual cortex, where selected neurons fire depending on the direction of object motion, along with the size and orientation of the object. The neuromorphic circuit is biomimetic. It consists of neurons and synapses, and models biological mechanisms. Neurons (including the Axon Hillock and the Dendritic Arbor) are designed with CMOS technology and synapses (both excitatory and inhibitory) are designed with Carbon Nanotube Transistors...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28227434/electrospinning-of-gelatin-and-smpu-with-carbon-nanotubes-for-tissue-engineering-scaffolds
#16
Monica A Mejia, Lina M Hoyos, Jenniffer Zapata, Luz M Restrepo, Maria E Moneada, Monica A Mejia, Lina M Hoyos, Jenniffer Zapata, Luz M Restrepo, Maria E Moneada, Lina M Hoyos, Jenniffer Zapata, Monica A Mejia, Luz M Restrepo
The nanofibres created by electrospinning technique are currently used for a variety of applications in tissue engineering; and Gelatin and Polyurethane Shape-Memory (SMPU) have important results in biomedicine. Similarly, carbon nanotubes combined with other biomaterials change important properties, opening new opportunities for biomedical applications. In this work, we constructed scaffold using electrospinning technique based in bovine-hide gelatin, SMPU and both materials hybrid with carbon nanotube. Morphology and cytotoxicity were evaluated and mechanical properties for two materials were obtained in scaffold building...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28226766/a-neuromorphic-circuit-mimicking-biological-short-term-memory
#17
Saeid Barzegarjalali, Alice C Parker, Saeid Barzegarjalali, Alice C Parker, Alice C Parker, Saeid Barzegarjalali
Research shows that the way we remember things for a few seconds is a different mechanism from the way we remember things for a longer time. Short-term memory is based on persistently firing neurons, whereas storing information for a longer time is based on strengthening the synapses or even forming new neural connections. Information about location and appearance of an object is segregated and processed by separate neurons. Furthermore neurons can continue firing using different mechanisms. Here, we have designed a biomimetic neuromorphic circuit that mimics short-term memory by firing neurons, using biological mechanisms to remember location and shape of an object...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28226500/sensing-textile-seam-line-for-wearable-multimodal-physiological-monitoring
#18
M McKnight, T Agcayazi, H Kausche, T Ghosh, A Bozkurt, M McKnight, T Agcayazi, H Kausche, T Ghosh, A Bozkurt, T Ghosh, T Agcayazi, M McKnight, A Bozkurt, H Kausche
This paper investigates a novel multimodal sensing method by forming seam-lines of conductive textile fibers into commercially available fabrics. The proposed ultra-low cost micro-electro-mechanical sensor would provide, wearable, flexible, textile based biopotential signal recording, wetness detection and tactile sensing simultaneously. Three types of fibers are evaluated for their array-based sensing capability, including a 3D printed conductive fiber, a multiwall carbon nanotube based fiber, and a commercially available stainless steel conductive thread...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28226280/development-of-electrochemical-biosensor-for-detection-of-pathogenic-microorganism-in-asian-dust-events
#19
Min-Sang Yoo, Minguk Shin, Younghun Kim, Min Jang, Yoon-E Choi, Si Jae Park, Jonghoon Choi, Jinyoung Lee, Chulhwan Park
We developed a single-walled carbon nanotubes (SWCNTs)-based electrochemical biosensor for the detection of Bacillus subtilis, one of the microorganisms observed in Asian dust events, which causes respiratory diseases such as asthma and pneumonia. SWCNTs plays the role of a transducer in biological antigen/antibody reaction for the electrical signal while 1-pyrenebutanoic acid succinimidyl ester (1-PBSE) and ant-B. subtilis were performed as a chemical linker and an acceptor, respectively, for the adhesion of target microorganism in the developed biosensor...
February 19, 2017: Chemosphere
https://www.readbyqxmd.com/read/28226271/thermal-buckling-behavior-of-defective-cnts-under-pre-load-a-molecular-dynamics-study
#20
Fahimeh Mehralian, Yaghoub Tadi Beni, Yaser Kiani
Current study is concentrated on the extraordinary properties of defective carbon nanotubes (CNTs). The role of vacancy defects in thermal buckling response of precompressed CNTs is explored via molecular dynamics (MD) simulations. Defective CNTs are initially compressed at a certain ratio of their critical buckling strain and then undergo a uniform temperature rise. Comprehensive study is implemented on both armchair and zigzag CNTs with different vacancy defects including monovacancy, symmetric bivacancy and asymmetric bivacancy...
January 25, 2017: Journal of Molecular Graphics & Modelling
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