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https://www.readbyqxmd.com/read/28342314/electrochemical-dna-sandwich-biosensor-based-on-enzyme-amplified-microrna-21-detection-and-gold-nanoparticles
#1
Jihane Mandli, Hasna Mohammadi, Aziz Amine
In this work, a novel electrochemical biosensor for miRNA-21 determination, involving a sandwich hybridization assay onto gold nanoparticles modified pencil graphite electrode (PGE) and enzyme signal amplification was reported. The thiol terminated capture probe 1 (SH-P1) was immobilized on the electrode through AuS interaction. In the presence of target miRNA-21, SH-P1 hybridized with the first part of the target, however, the second part hybridizes with a biotinylated probe P2 (B-P2). Then, a streptavidin-conjugated alkaline phosphatase was immobilized by a specific binding of avidin-B-P2...
March 14, 2017: Bioelectrochemistry
https://www.readbyqxmd.com/read/28340989/bio-electron-fenton-bef-process-driven-by-microbial-fuel-cells-for-triphenyltin-chloride-tptc-degradation
#2
Xiao-Yu Yong, Dong-Yan Gu, Yuan-Dong Wu, Zhi-Ying Yan, Jun Zhou, Xia-Yuan Wu, Ping Wei, Hong-Hua Jia, Tao Zheng, Yang-Chun Yong
The intensive use of triphenyltin chloride (TPTC) has caused serious environmental pollution. In this study, an effective method for TPTC degradation was proposed based on the Bio-Electron-Fenton process in microbial fuel cells (MFCs). The maximum voltage of the MFC with graphite felt as electrode was 278.47% higher than that of carbon cloth. The electricity generated by MFC can be used for in situ generation of H2O2 to a maximum of 135.96μmolL(-1) at the Fe@Fe2O3(*)/graphite felt composite cathode, which further reacted with leached Fe(2+) to produce hydroxyl radicals...
February 15, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28340726/a-flow-batch-manipulated-ag-nps-based-spr-sensor-for-colorimetric-detection-of-copper-ions-cu-2-in-water-samples
#3
Jingji Peng, Guokun Liu, Dongxing Yuan, Sichao Feng, Tingjin Zhou
Using flow-batch analysis, a highly sensitive and selective method for automatic colorimetric detection of copper ions (Cu(2+)) was produced on the basis of the surface plasma resonance (SPR) of silver nanoparticles (Ag NPs). The Ag NPs were catalytically etched by thiosulfate in the presence of Cu(NH3)4(2+), resulting in a color change of the solution induced by the absorbance decrease at 401nm of the SPR peak of Ag NPs. The proposed method showed high selectivity for Cu(2+) over various metallic ions, including Fe(3+), Mn(2+), Co(2+), Ni(2+), Zn(2+), Pb(2+), Ba(2+), Cd(2+), Bi(3+), Sb(2+), As(3+), Hg(2+), Cr(3+) and K(+)...
May 15, 2017: Talanta
https://www.readbyqxmd.com/read/28339256/analytic-interatomic-forces-in-the-random-phase-approximation
#4
Benjamin Ramberger, Tobias Schäfer, Georg Kresse
We discuss that in the random phase approximation (RPA) the first derivative of the energy with respect to the Green's function is the self-energy in the GW approximation. This relationship allows us to derive compact equations for the RPA interatomic forces. We also show that position dependent overlap operators are elegantly incorporated in the present framework. The RPA force equations have been implemented in the projector augmented wave formalism, and we present illustrative applications, including ab initio molecular dynamics simulations, the calculation of phonon dispersion relations for diamond and graphite, as well as structural relaxations for water on boron nitride...
March 10, 2017: Physical Review Letters
https://www.readbyqxmd.com/read/28339181/oxidative-polyoxometalates-modified-graphitic-carbon-nitride-for-visible-light-co2-reduction
#5
Jie Zhou, Weichao Chen, Chunyi Sun, Lu Han, Chao Qin, Mengmeng Chen, Xinlong Wang, Enbo Wang, Zhongmin Su
Developing a photocatalysis system for converting CO2 to valuable fuels or chemicals is a promising strategy to address global warming and fossil fuel consumption. Exploring photocatalysts with high-performance and low-cost has been two ultimate goals toward photoreduction of CO2. Herein, noble-metal-free polyoxometalates (Co4) with oxidative ability was first introduced into g-C3N4 resulted in inexpensive hybrid materials (Co4@g-C3N4) with staggered band alignment. The staggered composited materials show a higher activity of CO2 reduction than bare g-C3N4...
March 24, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28338691/surfactant-free-single-layer-graphene-in-water
#6
George Bepete, Eric Anglaret, Luca Ortolani, Vittorio Morandi, Kai Huang, Alain Pénicaud, Carlos Drummond
Dispersing graphite in water to obtain true (single-layer) graphene in bulk quantity in a liquid has been an unreachable goal for materials scientists in the past decade. Similarly, a diagnostic tool to identify solubilized graphene in situ has been long awaited. Here we show that homogeneous stable dispersions of single-layer graphene (SLG) in water can be obtained by mixing graphenide (negatively charged graphene) solutions in tetrahydrofuran with degassed water and evaporating the organic solvent. In situ Raman spectroscopy of these aqueous dispersions shows all the expected characteristics of SLG...
April 2017: Nature Chemistry
https://www.readbyqxmd.com/read/28338642/determination-of-ultra-trace-rhodium-in-water-samples-by-graphite-furnace-atomic-absorption-spectrometry-after-cloud-point-extraction-using-2-5-iodo-2-pyridylazo-5-dimethylaminoaniline-as-a-chelating-agent
#7
Quan Han, Yanyan Huo, Jiangyan Wu, Yaping He, Xiaohui Yang, Longhu Yang
A highly sensitive method based on cloud point extraction (CPE) separation/preconcentration and graphite furnace atomic absorption spectrometry (GFAAS) detection has been developed for the determination of ultra-trace amounts of rhodium in water samples. A new reagent, 2-(5-iodo-2-pyridylazo)-5-dimethylaminoaniline (5-I-PADMA), was used as the chelating agent and the nonionic surfactant TritonX-114 was chosen as extractant. In a HAc-NaAc buffer solution at pH 5.5, Rh(III) reacts with 5-I-PADMA to form a stable chelate by heating in a boiling water bath for 10 min...
March 24, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/28338316/quantitative-characterization-of-the-surface-evolution-for-lini0-5co0-2mn0-3o2-graphite-cell-during-long-term-cycling
#8
Huiyuan Zheng, Qunting Qu, Guobin Zhu, Gao Liu, Vincent S Battaglia, Honghe Zheng
Many factors have been proposed explaining the capacity degradation mechanisms of LiNixCoyMnzO2 (NCM)/graphite cells at extreme conditions such as under high temperature or with high charge voltage limit. However, the main factors dominating the long-term cycling performance under normal operations remain elusive. Quantitative analyses of the electrode surface evolution for a commercial 18650 LiNi0.5Co0.2Mn0.3O2 (NCM523)/graphite cell during ca. 3000 cycles under normal operation are presented. Electrochemical analyses and inductively coupled plasma-optical emission spectroscopy (ICP-OES) confirm lithium inventory loss accounts for ca...
March 24, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28338314/surface-layer-evolution-on-graphite-during-electrochemical-sodium-tetraglyme-co-intercalation
#9
Julia Maibach, Fabian Jeschull, Daniel Brandell, Kristina Edstrom, Mario Valvo
One obstacle in sodium ion batteries is the lack of suitable anode materials. As recently shown, the most common anode material of the state of the art lithium ion batteries, graphite, can be used for sodium ion storage as well, if ether-based electrolyte solvents are used. These solvents co-intercalate with the sodium ions leading to the highly reversible formation of ternary graphite intercalation compounds (t-GIC). In order for the solvent co-intercalation to work efficiently, it is expected that only a very thin surface layer forms during electrochemical cycling...
March 24, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28337972/silicon-hollow-sphere-anode-with-enhanced-cycling-stability-by-a-template-free-method
#10
Song Chen, Zhuo Chen, Yunjun Luo, Min Xia, Chuanbao Cao
Silicon is a promising alternative anode material since it has a ten times higher theoretical specific capacity than that of a traditional graphite anode. However, the poor cycling stability due to the huge volume change of Si during charge/discharge processes has seriously hampered its widespread application. To address this challenge, we design a silicon hollow sphere nanostructure by selective etching and a subsequent magnesiothermic reduction. The Si hollow spheres exhibit enhanced electrochemical properties compared to the commercial Si nanoparticles...
April 21, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28337937/evaluation-of-methanogenic-microbial-electrolysis-cells-mecs-under-closed-open-circuit-operations
#11
Liwen Luo, Suyun Xu, Yueqing Jin, Runqi Han, Hongbo Liu, Fan Lü
This study investigated the independent roles of biofilm and external power supply for volatile fatty acids (VFAs) degradation and methane production in the microbial electrolysis cell (MEC). Reactors were operated in fed-batch mode in the presence of graphite felt(GF) or titanium-rod (Ti) as electrodes, in open circuit (OC, without applied voltage) or closed circuit (CC) conditions, i.e. R1 (Ti+CC), R2 (GF+CC) and R3 (GF+OC). The first-order kinetic analysis of acetate degradation indicated that the presence of GF biofilm and applied voltage in R2 improved the acetate degradation rate by 23% as compared to R1, while it was only 7% increment in R3 with GF biofilm...
March 24, 2017: Environmental Technology
https://www.readbyqxmd.com/read/28336889/self-propagating%C3%A2-combustion%C3%A2-triggered%C3%A2-synthesis%C3%A2-of%C3%A2-3d%C3%A2-lamellar%C3%A2-graphene-bafe12o19%C3%A2-composite%C3%A2-and%C3%A2-its%C3%A2-electromagnetic%C3%A2-wave%C3%A2-absorption%C3%A2-properties
#12
Tingkai Zhao, Xianglin Ji, Wenbo Jin, Wenbo Yang, Xiarong Peng, Shichang Duan, Alei Dang, Hao Li, Tiehu Li
The synthesis of 3D lamellar graphene/BaFe12O19 composites was performed by oxidizing graphite and sequentially self-propagating combustion triggered process. The 3D lamellar graphene structures were formed due to the synergistic effect of the tremendous heat induced gasification as well as huge volume expansion. The 3D lamellar graphene/BaFe12O19 composites bearing 30 wt % graphene present the reflection loss peak at -27.23 dB as well as the frequency bandwidth at 2.28 GHz (< -10 dB). The 3D lamellar graphene structures could consume the incident waves through multiple Reflection and scattering within the layered structures, Prolonging the propagation path of electromagnetic waves in the absorbers...
March 3, 2017: Nanomaterials
https://www.readbyqxmd.com/read/28336857/linear-and-nonlinear-rheology-combined-with-dielectric-spectroscopy-of-hybrid-polymer-nanocomposites-for-semiconductive-applications
#13
Roland Kádár, Mahdi Abbasi, Roxana Figuli, Mikael Rigdahl, Manfred Wilhelm
The linear and nonlinear oscillatory shear, extensional and combined rheology-dielectric spectroscopy of hybrid polymer nanocomposites for semiconductive applications were investigated in this study. The main focus was the influence of processing conditions on percolated poly(ethylene-butyl acrylate) (EBA) nanocomposite hybrids containing graphite nanoplatelets (GnP) and carbon black (CB). The rheological response of the samples was interpreted in terms of dispersion properties, filler distortion from processing, filler percolation, as well as the filler orientation and distribution dynamics inside the matrix...
January 24, 2017: Nanomaterials
https://www.readbyqxmd.com/read/28336846/preparation-of-g-c%C3%A2-n%C3%A2-graphene-composite-for-detecting-no%C3%A2-at-room-temperature
#14
Shaolin Zhang, Nguyen Thuy Hang, Zhijun Zhang, Hongyan Yue, Woochul Yang
Graphitic carbon nitride (g-C₃N₄) nanosheets were exfoliated from bulk g-C₃N₄ and utilized to improve the sensing performance of a pure graphene sensor for the first time. The role of hydrochloric acid treatment on the exfoliation result was carefully examined. The exfoliated products were characterized by X-ray diffraction (XRD) patterns, scanning electron microscopy (SEM), atomic force microscopy (AFM), and UV-Vis spectroscopy. The exfoliated g-C₃N₄ nanosheets exhibited a uniform thickness of about 3-5 nm and a lateral size of about 1-2 µm...
January 12, 2017: Nanomaterials
https://www.readbyqxmd.com/read/28335324/dna-origami-reorganizes-upon-interaction-with-graphite-implications-for-high-resolution-dna-directed-protein-patterning
#15
Masudur Rahman, David Neff, Nathaniel Green, Michael L Norton
Although there is a long history of the study of the interaction of DNA with carbon surfaces, limited information exists regarding the interaction of complex DNA-based nanostructures with the important material graphite, which is closely related to graphene. In view of the capacity of DNA to direct the assembly of proteins and optical and electronic nanoparticles, the potential for combining DNA-based materials with graphite, which is an ultra-flat, conductive carbon substrate, requires evaluation. A series of imaging studies utilizing Atomic Force Microscopy has been applied in order to provide a unified picture of this important interaction of structured DNA and graphite...
October 31, 2016: Nanomaterials
https://www.readbyqxmd.com/read/28335301/facile-synthesis-of-g-c%C3%A2-n%C3%A2-nanosheets-zno-nanocomposites-with-enhanced-photocatalytic-activity-in-reduction-of-aqueous-chromium-vi-under-visible-light
#16
Xiaoya Yuan, Chao Zhou, Qiuye Jing, Qi Tang, Yuanhua Mu, An-Ke Du
Graphitic-C₃N₄ nanosheets (CN)/ZnO photocatalysts (CN/ZnO) with different CN loadings were successfully prepared via a simple precipitation-calcination in the presence of exfoliated C₃N₄ nanosheets. Their morphology and structure were thoroughly characterized by powder X-ray diffraction (XRD), scanning electron microscopy (SEM), high-resolution transmission electron microscopy (HRTEM), X-ray photoelectron spectroscopy (XPS), UV-Vis diffuse reflectance spectroscopy (DRS) and photoluminescence spectra (PL)...
September 14, 2016: Nanomaterials
https://www.readbyqxmd.com/read/28335187/nickel-decorated-on-phosphorous-doped-carbon-nitride-as-an-efficient-photocatalyst-for-reduction-of-nitrobenzenes
#17
Anurag Kumar, Pawan Kumar, Chetan Joshi, Manvi Manchanda, Rabah Boukherroub, Suman L Jain
Nickel nanoparticle-decorated phosphorous-doped graphitic carbon nitride (Ni@g-PC₃N₄) was synthesized and used as an efficient photoactive catalyst for the reduction of various nitrobenzenes under visible light irradiation. Hydrazine monohydrate was used as the source of protons and electrons for the intended reaction. The developed photocatalyst was found to be highly active and afforded excellent product yields under mild experimental conditions. In addition, the photocatalyst could easily be recovered and reused for several runs without any detectable leaching during the reaction...
April 1, 2016: Nanomaterials
https://www.readbyqxmd.com/read/28332926/efficient-degradation-of-organic-phosphorus-in-glyphosate-wastewater-by-catalytic-wet-oxidation-using-modified-activated-carbon-as-a-catalyst
#18
Bo Xing, Honglin Chen, Xiaoming Zhang
Glyphosate (PMG) wastewater, which is an organic phosphorus (OP) wastewater containing 200-3000 mg/L glyphosate, was treated via catalytic wet oxidation (CWO) to degrade glyphosate to orthophosphate (PO4(3-)). The catalysts were activated carbons (ACs) modified by H2O2 oxidation and thermal treatment with ammonia or melamine. The catalysts were characterized using N2 adsorption/desorption, Boehm titration, and XPS. The CWO experiments were performed in a co-current upflow fixed bed reactor at 110-130 °C and under 1...
March 23, 2017: Environmental Technology
https://www.readbyqxmd.com/read/28332840/visible-light-mediated-catalytic-hydroacylation-of-dialkyl-azodicarboxylates-by-graphite-flakes
#19
Giorgos S Koutoulogenis, Maroula G Kokotou, Errika Voutyritsa, Dimitris Limnios, Christoforos G Kokotos
A novel and efficient metal-free catalyzed hydroacylation of dialkyl azodicarboxylates is reported. Graphite flakes were found to be the most efficient catalyst among other carbon-based materials to promote this reaction. This unprecedented catalytic activity can be expanded into a wide substrate scope of aliphatic aldehydes bearing various functional groups, leading to the corresponding products in good to excellent yields.
March 23, 2017: Organic Letters
https://www.readbyqxmd.com/read/28330341/wetting-at-the-nanoscale-a-molecular-dynamics-study
#20
Mohammad Khalkhali, Nasser Kazemi, Hao Zhang, Qingxia Liu
A novel method to calculate the solid-liquid contact angle is introduced in this study. Using the 3D configuration of a liquid droplet on a solid surface, this method calculates the contact angle along the contact line and provides an angular distribution. Although this method uses the 3D configuration of liquid droplets, it does not require the calculation of the 3D density profile to identify the boundaries of the droplet. This decreases the computational cost of the contact angle calculation greatly. Moreover, no presumption about the shape of the liquid droplet is needed when using the method introduced in this study...
March 21, 2017: Journal of Chemical Physics
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