keyword
MENU ▼
Read by QxMD icon Read
search

Graphite

keyword
https://www.readbyqxmd.com/read/28108958/biocompatibility-study-of-three-distinct-carbon-pastes-for-application-as-electrode-material-in-neural-stimulations-and-recordings
#1
Melinda Varga, Paul Wolff, Klaus-Juergen Wolter
Neural interfaces hold great promise for research and treatment of a wide variety of neurological diseases. Medical electrodes are designed to interface with the nervous system and provide control signals for neural prostheses. We fabricated previously a hook-up neural electrode. Here we investigate the in vitro cytotoxicity of three commercial carbon pastes used for printing the conductor tracks of this electrode. At first, the carbon pastes were characterized with respect to their microstructure and chemical composition...
February 2017: Journal of Materials Science. Materials in Medicine
https://www.readbyqxmd.com/read/28107958/one-step-synthesis-of-graphitic-carbon-nitride-nanosheets-with-the-help-of-melamine-and-its-application-for-fluorescence-detection-of-mercuric-ions
#2
Qianfen Zhuang, Liming Sun, Yongnian Ni
A facile, simple, and relatively environment-friendly hydrothermal approach was developed for one-step synthesis of graphitic carbon nitride nanosheets (GCNNs) using melamine and sodium citrate as the precursors. The prepared GCNNs emit strong fluorescence with a high quantum yield of 48.3%. The GCNNs were then characterized by various techniques including transmission electron microscopy, atomic force microscopy, X-ray diffraction, Fourier transform infrared spectroscopy, and UV-Vis absorption spectroscopy...
March 1, 2017: Talanta
https://www.readbyqxmd.com/read/28107950/label-free-potentiometric-biosensor-based-on-solid-contact-for-determination-of-total-phenols-in-honey-and-propolis
#3
Patrícia Ferrante Draghi, Julio Cesar Bastos Fernandes
We developed a label-free potentiometric biosensor using tyrosinase extracted from Musa acuminata and immobilized by covalent bond on a surface of a solid-contact transducer. The transducer was manufactured containing two layers. The first layer contained a blend of poly(vinyl) chloride carboxylated (PVC-COOH), graphite and potassium permanganate. On this layer, we deposited a second layer containing just a mixture of poly(vinyl chloride) carboxylated and graphite. On the last layer of the transducer, we immobilized the tyrosinase enzyme by reaction with N-(3-dimethylaminopropyl)-N'-ethylcarbodiimide hydrochloride...
March 1, 2017: Talanta
https://www.readbyqxmd.com/read/28107933/graphene-like-carbon-nanosheets-as-a-new-electrode-material-for-electrochemical-determination-of-hydroquinone-and-catechol
#4
Hongmei Jiang, Shuqin Wang, Wenfang Deng, Youming Zhang, Yueming Tan, Qingji Xie, Ming Ma
We report here graphene-like carbon nanosheets (GCN) as a new electrode material for the electrochemical determination of hydroquinone (HQ) and catechol (CC). The GCN were prepared from maltose using ammonia chloride as a blowing agent and cobalt nitrate as a graphitization catalyst precursor. The as-prepared GCN material shows high graphitization degree, abundant porosity, and large specific surface area. Two well-separated anodic peaks for HQ and CC are obtained at GCN modified glassy carbon electrode (GCE) with a peak-to-peak separation of 118mV...
March 1, 2017: Talanta
https://www.readbyqxmd.com/read/28107911/a-positively-charged-porous-graphitic-carbon-stationary-phase-for-hydrophilic-interaction-liquid-chromatography
#5
Yanjie Hou, Feifang Zhang, Xuefang Liu, Yanjun Ren, Bingcheng Yang
High chemical inertness of porous graphitic carbon particles (PGC) makes their surface modification rather difficult. Here a facile way is proposed to prepare a PGC stationary phase with quaternary ammonium-polyvinyl alcohol mixed functional groups for hydrophilic interaction liquid chromatography (HILIC) by generating a thin layer of polyvinyl alcohol (PVA) and poly(diallyldimethylammonium chloride) (DDAC) copolymer onto PGC particles. The phase shows obvious positively electrostatic character and typical HILIC character, exhibiting different selectivity relative to several HILIC phases and bare PGC...
March 1, 2017: Talanta
https://www.readbyqxmd.com/read/28107902/electrolyzing-synthesis-of-boron-doped-graphene-quantum-dots-for-fluorescence-determination-of-fe-3-ions-in-water-samples
#6
Li Chen, Chuanli Wu, Pan Du, Xiaowei Feng, Ping Wu, Chenxin Cai
This work reports a facile electrolyzing method to synthesize boron-doped graphene quantum dots (BGQDs) and uses the BGQDs as a fluorescent probe to determine Fe(3+) ion levels in water samples. The BGQDs were produced by oxidizing graphite in an aqueous borax solution at pH 7; then, the borate solution was filtered with BGQDs, and the borate was dialyzed from the filtrate, leaving a solution of BGQDs in water. The amount of the B in the BGQDs can be adjusted by changing the concentration of borax used for the electrolyte...
March 1, 2017: Talanta
https://www.readbyqxmd.com/read/28106979/li-ion-localization-and-energetics-as-a-function-of-anode-structure
#7
Nicholas William McNutt, Marshall T McDonnell, Orlando Rios, David J Keffer
In this work, we study the effect of carbon composite anode structure on the localization and energetics of Li-ions. A computational molecular dynamics study is combined with experimental results from neutron scattering experiments to understand the effect of composite density, crystallite size, volume fraction of crystalline carbon, and ion loading on the nature of ion storage in novel, lignin-derived composite materials. In a recent work1, we demonstrated that these carbon composites display a fundamentally different mechanism for Li-ion storage than traditional graphitic anodes...
January 20, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28106187/layer-separable-and-gap-tunable-topological-insulators
#8
Kai-Wei Chang, Wei Ji, Chao-Cheng Kaun
The way in which states of a topological insulator (TI) transform from monolayer to bulk is an important issue for applications in spintronics. However, unlike graphite, most layered materials are difficult to exfoliate. Using first-principles calculations, we predict that thallium selenide (TlSe) will be a layered TI with rather weak interlayer coupling and thus it should be exfoliated easily. The evolution of the topological states can also be driven by doping with indium (In) atoms or applying lateral strains...
January 20, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28106007/atomic-layer-deposition-of-1d-and-2d-nickel-nanostructures-on-graphite
#9
Seung Ryu, Jaehong Yoon, Hyoung-Seok Moon, Bonggeun Shong, Hyungjun Kim, Han-Bo-Ram Lee
One-dimensional (1D) nanowires (NWs) and two-dimensional (2D) thin films of Ni were deposited on highly ordered pyrolytic graphite (HOPG) by atomic layer deposition (ALD), using NH<sub>3</sub> as a counter reactant. Thermal ALD using NH<sub>3</sub> gas forms 1D NWs along step edges, while NH<sub>3</sub> plasma enables the deposition of a continuous 2D film over the whole surface. The lateral and vertical growth rates of the Ni NWs are numerically modeled as a function of the number of ALD cycles...
January 20, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28105980/determination-of-antimony-in-pharmaceutical-formulations-and-beverages-using-high-resolution-continuum-source-graphite-furnace-atomic-absorption-spectrometry
#10
Patricia Mattiazzi, Denise Bohrer, Carine Viana, Paulo Cícero do Nascimento, Marlei Veiga, Leandro Machado de Carvalho
A sensitive and accurate method, employing highresolutioncontinuum source atomic absorptionspectrometry, for the determination of antimony(Sb) was developed. Conditions such as pyrolysisand atomization temperatures, the use of chemicalmodifiers, and sample pretreatment were optimizedfor the determination of Sb in pharmaceuticalpreparations and beverages stored in polyethyleneterephthalate (PET) containers. In addition tocontainer analysis, the influence of time of contact,temperature, and content composition on themigration of Sb was investigated...
January 19, 2017: Journal of AOAC International
https://www.readbyqxmd.com/read/28105756/discrimination-between-conglomerates-and-pseudoracemates-using-surface-coverage-plots-in-2d-self-assemblies-at-the-liquid-graphite-interface
#11
Naoki Maeda, Takashi Hirose, Kenji Matsuda
The two-dimensional (2D) molecular ordering of two photochromic diarylethenes was investigated using scanning tunneling microscopy at the liquid-graphite interface. The racemic mixture of the closed-ring isomer of one of the diarylethenes showed spontaneous separation of its enantiomers upon 2D crystallization, whereas that of the other diarylethene formed a pseudoracemic crystal in which two enantiomers coexist in a 2D ordering domain. The mixing of enantiomers in 2D assemblies can be analyzed by the dependence of the surface coverage on the concentration of enantiomers at different enantiomeric ratios...
January 20, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28104756/sugar-nucleotide-quantification-by-liquid-chromatography-tandem-mass-spectrometry-reveals-a-distinct-profile-in-plasmodium-falciparum-sexual-stage-parasites
#12
Borja López-Gutiérrez, Rhoel R Dinglasan, Luis Izquierdo
The obligate intracellular lifestyle of Plasmodium falciparum and the difficulties to obtain sufficient amounts of biological material has hampered the study of specific metabolic pathways in the malaria parasite. Thus, for example, the pools of sugar nucleotides required to fuel glycosylation reactions have never been studied in-depth in well-synchronized asexual parasites or in other stages of its life cycle. These metabolites are of critical importance, especially considering the renewed interest in the presence of N -, O - and other glycans in key parasite proteins...
January 19, 2017: Biochemical Journal
https://www.readbyqxmd.com/read/28102670/microfluidization-of-graphite-and-formulation-of-graphene-based-conductive-inks
#13
Panagiotis G Karagiannidis, Stephen A Hodge, Lucia Lombardi, Flavia Tomarchio, Nicolas Decorde, Silvia Milana, Ilya Goykhman, Yang Su, Steven V Mesite, Duncan N Johnstone, Rowan K Leary, Paul A Midgley, Nicola M Pugno, Felice Torrisi, Andrea C Ferrari
We report the exfoliation of graphite in aqueous solutions under high shear rate turbulent flow conditions, with a 100\% exfoliation yield. The material is stabilized without centrifugation at concentrations up to 100 g/L using carboxymethylcellulose sodium salt to formulate conductive printable inks. The sheet resistance of blade coated films is below~2Ω/□. This is a simple and scalable production route for conductive inks for large area printing in flexible electronics.
January 19, 2017: ACS Nano
https://www.readbyqxmd.com/read/28102408/bottom-up-synthesis-of-nitrogen-doped-porous-carbon-scaffolds-for-lithium-and-sodium-storage
#14
Hongling Lu, Renpeng Chen, Yi Hu, Xiaoqi Wang, Yanrong Wang, Lianbo Ma, Guoyin Zhu, Tao Chen, Zuoxiu Tie, Zhong Jin, Jie Liu
Here we report an effective bottom-up solution-phase process for the preparation of nitrogen-doped porous carbon scaffolds (NPCSs), which can be employed as high-performance anode materials for both lithium-ion batteries (LIBs) and sodium-ion batteries (SIBs). The as-obtained NPCSs show favorable features for electrochemical energy storage such as high specific surface area, appropriate pore size distribution (3.9 nm in average), large pore volume (1.36 cm(3) g(-1)), nanosheet-like morphology, a certain degree of graphitization, enlarged interlayer distance (0...
January 19, 2017: Nanoscale
https://www.readbyqxmd.com/read/28102394/markedly-enhanced-visible-light-photocatalytic-h2-generation-over-g-c3n4-nanosheets-decorated-by-robust-nickel-phosphide-ni12p5-cocatalysts
#15
Jiuqing Wen, Jun Xie, Rongchen Shen, Xin Li, XingYi Luo, Hongdan Zhang, Aiping Zhang, Guican Bi
In the present work, nickel phosphide (Ni12P5) modified graphitic carbon nitride (g-C3N4) nanosheets were synthesized by a simple grinding method. The structural characterization clearly proved that Ni12P5 nanoparticles were well loaded on the surface of g-C3N4 nanosheets. The photocatalytic activity of the composites was tested by catalyzing the reduction of water to hydrogen under visible light irradiation. The results demonstrate that Ni12P5 is an efficient co-catalyst for photocatalytic H2 production of g-C3N4 nanosheets...
January 19, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/28102368/novel-electron-phonon-relaxation-pathway-in-graphite-revealed-by-time-resolved-raman-scattering-and-angle-resolved-photoemission-spectroscopy
#16
Jhih-An Yang, Stephen Parham, Daniel Dessau, Dmitry Reznik
Time dynamics of photoexcited electron-hole pairs is important for a number of technologies, in particular solar cells. We combined ultrafast pump-probe Raman scattering and photoemission to directly follow electron-hole excitations as well as the G-phonon in graphite after an excitation by an intense laser pulse. This phonon is known to couple relatively strongly to electrons. Cross-correlating effective electronic and phonon temperatures places new constraints on model-based fits. The accepted two-temperature model predicts that G-phonon population should start to increase as soon as excited electron-hole pairs are created and that the rate of increase should not depend strongly on the pump fluence...
January 19, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28099157/high-quality-epitaxial-graphene-by-hydrogen-etching-of-3c-sic-111-thin-film-on-si-111
#17
Bharati Gupta, Carlo Mariani, Josh Lipton-Duffin, Nunzio Motta, Pierluigi Mondelli, Maria Betti
Etching with atomic hydrogen as a preparation step before the high-temperature growth process of graphene onto a thin 3C-SiC film grown on Si(111) greatly improves the structural quality of topmost graphene layers. Pit formation and island coalescence, which are typical of graphene growth by SiC graphitization, are quenched and accompanied by widening of the graphene domain sizes to hundreds of nm, and by a significant reduction in surface roughness down to a single substrate bilayer. The surface reconstructions expected for graphene and the underlying layer are shown with atomic resolution by scanning tunnelling microscopy (STM)...
January 18, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28098966/surface-optical-rectification-from-layered-mos2-crystal-by-thz-time-domain-surface-emission-spectroscopy
#18
Yuanyuan Huang, Lipeng Zhu, Qiyi Zhao, Yaohui Guo, Zhaoyu Ren, Jin Tao Bai, Xin Long Xu
Surface optical rectification was observed from the layered semiconductor molybdenum disulfide (MoS2) crystal via terahertz (THz) time-domain surface emission spectroscopy under linearly polarized femtosecond laser excitation. The radiated THz amplitude of MoS2 has a linear dependence on ever-increasing pump fluence and thus quadratic with the pump electric field, which discriminates from the surface Dember field induced THz radiation in InAs and the transient photocurrent induced THz generation in graphite...
January 18, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28098443/fe-cluster-pushing-electrons-to-n-doped-graphitic-layers-with-fe3c-fe-hybrid-nanostructure-to-enhance-o2-reduction-catalysis-of-zn-air-batteries
#19
Jie Yang, Jiangtao Hu, Mouyi Weng, Rui Tan, Lei-Lei Tian, Jinlong Yang, Joseph Amine, Jia-Xin Zheng, Haibiao Chen, Feng Pan
Non-noble metal catalysts with oxygen reduction reaction (ORR) performance comparable or even superior to that of Pt are extremely important for metal-air batteries and fuel cells. Here we report a simple and controllable strategy to synthesize Fe-cluster embedded in Fe3C nanoparticles (designated as Fe3C(Fe)) encased in nitrogen-doped Graphitic Layers (NDGL) with graphitic shells as a novel hybrid nanostructure as an effective ORR catalyst by directly pyrolyzing a mixture of Prussian blue (PB) and glucose...
January 18, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28096491/expressing-the-geobacter-metallireducens-pila-in-geobacter-sulfurreducens-yields-pili-with-exceptional-conductivity
#20
Yang Tan, Ramesh Y Adhikari, Nikhil S Malvankar, Joy E Ward, Trevor L Woodard, Kelly P Nevin, Derek R Lovley
: The electrically conductive pili (e-pili) of Geobacter sulfurreducens serve as a model for a novel strategy for long-range extracellular electron transfer. e-pili are also a new class of bioelectronic materials. However, the only other Geobacter pili previously studied, which were from G. uraniireducens, were poorly conductive. In order to obtain more information on the range of pili conductivities in Geobacter species, the pili of G. metallireducens were investigated. Heterologously expressing the PilA gene of G...
January 17, 2017: MBio
keyword
keyword
77030
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"