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Yunping Wen, Long Chen, Ying Pang, Zhaowei Guo, Duan Bin, Yong-Gang Wang, Congxiao Wang, Yongyao Xia
This paper reports a facile sol-gel synthesis method to successfully prepare the TiP2O7/expanded graphite (EG) nanocomposite as an advanced anode material for aqueous lithium-ion batteries. The constructed TiP2O7 nanocomposite (50-100 nm) are in-situ encapsulated in the pore and layer structure of expanded graphite with good conductivity and high specific surface area. As a consequence, the resulting TiP2O7/EG electrode exhibits a reversible capacity of 66 mAh g-1 at 0.1 A g-1 with an appropriate potential of -0...
February 17, 2017: ACS Applied Materials & Interfaces
Ana Lourenco, Russell Thomas, Michael Homer, Hugo Bouchard, Severine Rossomme, James Renaud, Tatsuaki Kanai, Gary Royle, Hugo Palmans
The aim of this work is to develop and adapt a formalism to determine absorbed dose to water from graphite calorimetry measurements in carbon-ion beams. Fluence correction factors, <i>k</i><sub>fl</sub>, needed when using a graphite calorimeter to derive dose to water, were determined in a clinical high-energy carbon-ion beam. Measurements were performed in a 290 MeV/n carbon-ion beam with a field size of 11 x 11 cm<sup>2</sup>, without modulation. In order to sample the beam, a plane-parallel Roos ionization chamber was chosen for its small collecting volume in comparison with the field size...
February 17, 2017: Physics in Medicine and Biology
Chengzhang Zhu, Zhifeng Jiang, Linlin Chen, Kun Qian, Jimin Xie
Novel hierarchical NiS2 hollow spheres modified by graphite-like carbon nitride were prepared using a facile L-cysteine-assisted solvothermal route. The NiS2/g-C3N4 composites exhibited excellent photocatalytic efficiency in rhodamine B, methyl orange and ciprofloxacin degradation as compared to single g-C3N4 and NiS2, which could be due to the synergistic effects of the unique hollow sphere-like structure, strong visible-light absorption and increased separation rate of the photoinduced electron-hole pairs at the intimate interface of heterojunctions...
March 17, 2017: Nanotechnology
Kimberly C Mullane, Patrick J Carroll, Eric J Schelter
Organic azides containing naphthyl functionalities were used to prepare uranium(V) imido complexes UV[=NC(2-naph)Ph2][N(SiMe3)2]3 (2), UV[=NC(2-naph)3][N(SiMe3)2]3 (3), and UV[=N(2-naph)][N(SiMe3)2]3 (4), and compared with UV[=NCPh3][N(SiMe3)2]3 (1). The electronic structures of these compounds were investigated by solution electrochemistry studies that revealed accessible U(V/VI), U(IV/V), and naphthalene0/naphthalene-1 couples. The uranium(V) naphthyl-imido complexes were reduced by potassium graphite to yield their uranium(IV) congeners K[UIV[=NC(2-naph)Ph2][N(SiMe3)2]3] (2-K), K[UIV[=NC(2-naph)3][N(SiMe3)2]3] (3-K), and K[UIV[=N(2-naph)][N(SiMe3)2]3] (4-K)...
February 16, 2017: Chemistry: a European Journal
Alexander G Bannov, Jan Prášek, Ondřej Jašek, Lenka Zajíčková
Graphite oxide has been investigated as a possible room-temperature chemiresistive sensor of ammonia in a gas phase. Graphite oxide was synthesized from high purity graphite using the modified Hummers method. The graphite oxide sample was investigated using scanning electron microscopy, energy dispersive X-ray spectroscopy, X-ray diffraction, thermogravimetry and differential scanning calorimetry. Sensing properties were tested in a wide range of ammonia concentrations in air (10-1000 ppm) and under different relative humidity levels (3%-65%)...
February 9, 2017: Sensors
Tao Chen, Yuanhong Xu, Zhi Peng, Aihua Li, Jingquan Liu
Simultaneously enhancing the catalytic bioactivity and stability of enzyme is still an intractable issue in the enzymatic study. Herein, a facile and effective approach was designed to immobilize and modify laccase on a Cu(2+)-adsorbed pyrene-terminated block copolymer [poly(acrylic acid)/poly(poly(ethylene glycol) acrylate)] (PAA/PPEGA), which was prepared via well-controlled reversible addition-fragmentation chain transfer polymerization. PAA provided the supporting matrix for firm immobilization of Cu(2+), an enzyme bioactivity inducer, onto the microstructure of laccase, while avoiding any contamination of the heavy metal Cu(2+) into the following application system...
February 7, 2017: Analytical Chemistry
Bahaa G Mahmoud, Mohamed Khairy, Farouk A Rashwan, Craig E Banks
To overcome the recent outbreaks of hepatotoxicity-related drugs, a new analytical tool for the continuously determination of these drugs in human fluids is required. Electrochemical-based analytical methods offer an effective, rapid, and simple tool for on-site determination of various organic and inorganic species. However, the design of a sensitive, selective, stable, and reproducible sensor is still a major challenge. In the present manuscript, a facile, one-pot hydrothermal synthesis of bismuth oxide (Bi2O2...
February 7, 2017: Analytical Chemistry
Kohei Iritani, Kazukuni Tahara, Steven De Feyter, Yoshito Tobe
Host-guest chemistry in two-dimensional space, that is physisorbed monolayers of a single atom or a single molecular thickness on surfaces, has become a subject of intense current interest because of perspectives for various applications in molecular-scale electronics, selective sensors, and tailored catalysis. Scanning tunneling microscopy, with which we can visualize molecules in actual space, has been used as a powerful tool. For more than a decade, we have been investigating the self-assembly of a series of triangle-shaped molecules with a phenylene-ethynylene macrocycle, called dehydrobenzo[12]annulenes (DBAs), substituted by six flexible alkyl chains, forming hexagonal porous 2D molecular networks via van der Waals interactions between interdigitated alkyl chains at the interface of organic solvent and graphite...
February 16, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
John Muryn, Ashraf Morgan, Chris Liptak, Frank Dong, Paul Segars, Andrew Primak, Xiang Li
In Monte Carlo simulation of CT dose, many input parameters are required (e.g., bowtie filter properties and scan start/end location). Our goal was to examine the uncertainties in patient dose when input parameters were inaccurate. Using a validated Monte Carlo program, organ dose from a chest CT scan was simulated for an average-size female phantom using a reference set of input parameter values (treated as the truth). Additional simulations were performed in which errors were purposely introduced into the input parameter values...
February 16, 2017: Physics in Medicine and Biology
Victoria M Deans, Zafar Naqui, Lindsay T S W Muir
BACKGROUND: The management of scaphotrapeziotrapezoidal (STT) joint osteoarthritis (OA) remains controversial. This systematic review aims to review the evidence for surgical interventions specific to STT OA. METHODS: Medline and Embase libraries were searched using a pre-defined search strategy in October 2014. All study designs and languages were included and evaluated by two reviewers (VMD and LM) against the inclusion/exclusion criteria. The study eligibility criteria included papers discussing surgical treatment of STT OA, and the review was conducted using the PRISMA guidelines...
March 2017: Journal of Hand Surgery Asian-Pacific Volume
Yun Pei Zhu, Chunxian Guo, Yao Zheng, Shi-Zhang Qiao
Developing cost-effective and high-performance electrocatalysts for renewable energy conversion and storage is motivated by increasing concerns regarding global energy security and creating sustainable technologies dependent on inexpensive and abundant resources. Recent achievements in the design and synthesis of efficient non-precious-metal and even non-metal electrocatalysts make the replacement of noble metal counterparts for the hydrogen evolution reaction (HER), oxygen evolution reaction (OER), and oxygen reduction reaction (ORR) with earth-abundant elements, for example, C, N, Fe, Mn, and Co, a realistic possibility...
February 16, 2017: Accounts of Chemical Research
Keiji Takata
This paper presents the imaging of the expansion and contraction of graphite particles at the anode of a lithium-ion battery. The intercalation and deintercalation of Li ions in the graphite particles induced by charging and discharging lead to expansion and contraction of the layered materials. These changes in volume were imaged through current collectors using scanning probe microscopy, which permitted in-situ observation of the Li ion shift with high resolutions. We were able to evaluate the properties of each individual graphite particle...
February 15, 2017: Journal of Microscopy
Shuai Wang, Shuqiang Jiao, Donghua Tian, Hao-Sen Chen, Handong Jiao, Jiguo Tu, Yingjun Liu, Dai-Ning Fang
An ultrafast rechargeable multi-ions battery is presented, in which multi-ions can electrochemically intercalate into graphite layers, exhibiting a high reversible discharge capacity of ≈100 mAh g(-1) and a coulombic efficiency of ≈99% over hundreds of cycles at a high current density. The results may open up a new paradigm for multi-ions-based electrochemical battery technologies and applications.
February 15, 2017: Advanced Materials
Piotr Wychowanski, Konrad Malkiewicz
Objectives. The aim of the study was an assessment of the content of trace elements in enamel and dentin of teeth extracted in patients residing in urban and agricultural areas of Poland. Methods. The study included 30 generally healthy patients with retained third molars. 65 samples of enamel and dentin from individuals living in urban areas and 85 samples of enamel and dentin from individuals living in agricultural areas were prepared. The content of manganese, lead, cadmium, and chromium in the studied enamel and dentin samples from retained teeth was determined by Graphite Furnace Atomic Absorption Spectrometry...
2017: BioMed Research International
Anna Yu Likhacheva, Artem D Chanyshev, Sergey V Goryainov, Sergey V Rashchenko, Konstantin D Litasov
The increasing demand for use of polymers at extreme conditions makes important the exploration of their behavior in a wide pressure and temperature range, which remains unknown for polytetrafluoroethylene (PTFE), one of the most common materials. An in situ Raman spectroscopic study of PTFE shows that it is stable within the range of 2-6 GPa at 500 ℃ and up to 12 GPa at 400 ℃. At T > 500 ℃ and P > 3.5 GPa, the graphitization of PTFE is observed, but judging from the preservation of liquid run products, PTFE can be used as a material for sample container up to 600 ℃ at this pressure...
January 1, 2017: Applied Spectroscopy
Botong Liu, Juan Xie, Hui Ma, Xi Zhang, Yue Pan, Jiawei Lv, Huan Ge, Na Ren, Haiquan Su, Xiaoji Xie, Ling Huang, Wei Huang
Many methods have been reported for synthesizing graphene oxide (GO) and graphene oxide quantum dots (GOQDs) where a tedious operational procedure and long reaction time are generally required. Herein, a facile one-pot solvothermal method that allows selective synthesis of pure GO and pure GOQDs, respectively is demonstrated. What is more, the final product of either GO or differently sized GOQDs can be easily controlled by adjusting the reaction temperatures or reactant ratios, which is also feasible when enlarged to gram scale...
February 13, 2017: Small
Shu-Wei Liu, Hua-Ping Wang, Qiang Xu, Tian-Bao Ma, Gui Yu, Chenhui Zhang, Dechao Geng, Zhiwei Yu, Shengguang Zhang, Wenzhong Wang, Yuan-Zhong Hu, Hui Wang, Jianbin Luo
Superlubricity of graphite and graphene has aroused increasing interest in recent years. Yet how to obtain a long-lasting superlubricity between graphene layers, under high applied normal load in ambient atmosphere still remains a challenge but is highly desirable. Here, we report a direct measurement of sliding friction between graphene and graphene, and graphene and hexagonal boron nitride (h-BN) under high contact pressures by employing graphene-coated microsphere (GMS) probe prepared by metal-catalyst-free chemical vapour deposition...
February 14, 2017: Nature Communications
Suyana Panneri, Priyanka Ganguly, Balagopal N Nair, Abdul Azeez Peer Mohamed, Krishna Gopa Kumar Warrier, Unnikrishnan Nair Saraswathy Hareesh
In this paper, we provide a comprehensive evaluation of graphitic carbon nitride (C3N4) powders derived from the four different precursors melamine, cyanamide, thiourea, and urea for the photocatalytic degradation of tetracycline (TC) antibiotic under sunlight irradiation. The powders were synthesized by employing the conventional thermal decomposition method. The synthesized powders were examined using different characterization tools for evaluating the photophysical properties. The degradation profile revealed that urea-derived C3N4 showed the highest activity while melamine-derived C3N4 showed the least activity...
February 14, 2017: Environmental Science and Pollution Research International
Di-Yan Wang, Chuan-Yu Wei, Meng-Chang Lin, Chun-Jern Pan, Hung-Lung Chou, Hsin-An Chen, Ming Gong, Yingpeng Wu, Chunze Yuan, Michael Angell, Yu-Ju Hsieh, Yu-Hsun Chen, Cheng-Yen Wen, Chun-Wei Chen, Bing-Joe Hwang, Chia-Chun Chen, Hongjie Dai
Recently, interest in aluminium ion batteries with aluminium anodes, graphite cathodes and ionic liquid electrolytes has increased; however, much remains to be done to increase the cathode capacity and to understand details of the anion-graphite intercalation mechanism. Here, an aluminium ion battery cell made using pristine natural graphite flakes achieves a specific capacity of ∼110 mAh g(-1) with Coulombic efficiency ∼98%, at a current density of 99 mA g(-1) (0.9 C) with clear discharge voltage plateaus (2...
February 13, 2017: Nature Communications
Laís N Pires, Geovani C Brandão, Leonardo S G Teixeira
This paper presents a method for determining phospholipids in soybean lecithin samples by phosphorus determination using high-resolution continuum source graphite furnace molecular absorption spectrometry (HR-CS GF MAS) via molecular absorption of phosphorus monoxide. Samples were diluted in methyl isobutyl ketone. The best conditions were found to be 213.561nm with a pyrolysis temperature of 1300°C, a volatilization temperature of 2300°C and Mg as a chemical modifier. To increase the analytical sensitivity, measurement of the absorbance signal was obtained by summing molecular transition lines for PO surrounding 213nm: 213...
June 15, 2017: Food Chemistry
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