Read by QxMD icon Read


Tao Jiang, Hao Hong, Can Liu, Wei-Tao Liu, Kaihui Liu, Shiwei Wu
Interactions between elementary excitations, such as carriers, phonons and plasmons, are critical for understanding the optical and electronic properties of materials. The significance of these interactions is more prominent in low-dimensional materials and can dominate their physical properties due to the enhanced interactions between these excitations. One-dimensional single-walled carbon nanotubes provide an ideal system for studying such interactions due to their perfect physical structures and rich electronic properties...
March 15, 2018: Nano Letters
Jin-Wen Liu, Yu-Min Wang, Chong-Hua Zhang, Lu-Ying Duan, Zheng Li, Ru-Qin Yu, Jian-Hui Jiang
Unique physicochemical characteristics of graphitic carbon nitride (g-CN) nanosheets suit them a useful tool for two-photon fluorescence bioimaging. Current g-CN nanosheets based imaging probes typically use the "always-on" design strategies, which may suffer from increased fluorescence background and limited contrast. To advance corresponding applications, g-CN nanosheets based activatable two-photon fluorescence probes remain to be explored. For the first time, we developed an activatable two-photon fluorescence probe, constructed from a nanoassembly of g-CN nanosheets and hyaluronic acid (HA)-gold nanoparticles (HA-AuNPs), for detection and imaging of hyaluronidase (HAase) in cancer cells...
March 15, 2018: Analytical Chemistry
Nathan Cho, Panagiotis Tsiamas, Esteban Velarde, Erik Tryggestad, Robert Jacques, Ross Berbeco, Todd McNutt, Peter Kazanzides, John Wong
PURPOSE: The Small Animal Radiation Research Platform (SARRP) has been developed for conformal micro irradiation with on-board cone-beam CT (CBCT) guidance. The graphics processing unit (GPU)-accelerated Superposition-Convolution (SC) method for dose computation has been integrated into the treatment planning system (TPS) for SARRP. This paper describes the validation of the SC method for the kilovoltage energy by comparing with EBT2 film measurements and Monte Carlo (MC) simulations...
March 15, 2018: Medical Physics
You Xu, Yinghao Li, Shuli Yin, Hongjie Yu, Hairong Xue, Xiaonian Li, Hongjing Wang, Liang Wang
Design of highly active and cost-effective electrocatalysts is very important for the generation of hydrogen by electrochemical water-splitting. Herein, we report the fabrication of ultrathin nitrogen-doped graphitized carbon shell encapsulating CoRu bimetallic nanoparticles (CoRu@NCs) and demonstrated their promising feasibility for efficiently catalyzing the hydrogen evolution reaction (HER) over a wide pH range. The resultant CoRu@NC nanohybrids possess an alloy-carbon core-shell structure with encapsulated low-ruthenium-content CoRu bimetallic alloy nanoparticles (10~30 nm) as the core and ultrathin nitrogen-doped graphitized carbon layers (2~6 layers) as the shell...
March 15, 2018: Nanotechnology
Franz Dinkelacker, Philipp Marzak, Jeongsik Yun, Yunchang Liang, Aliaksandr S Bandarenka
So-called solid electrolyte interface (SEI) in a lithium ion battery largely determines the performance of the whole system. However, it is one of the least understood objects in these types of batteries. SEIs are formed during the initial charge discharge cycles, prevent the organic electrolytes from further decomposition and at the same time govern lithium intercalation into the graphite anodes. In this work, we use electrochemical impedance spectroscopy and atomic force microscopy (AFM) to investigate the properties of SEI film and electrified "graphite/SEI/electrolyte interface"...
March 14, 2018: ACS Applied Materials & Interfaces
Lu Wang, Bo Jiang, Per Erik Vullum, Ann Mari Svensson, Andreas Erbe, Sverre M Selbach, Huailiang Xu, Fride Vullum-Bruer
A rechargeable Mg battery where the capacity mainly originates from reversible reactions occurring at the electrode/electrolyte interface efficiently avoids the challenge of sluggish Mg intercalation encountered in conventional Mg batteries. The interfacial reactions in a cell based on microwave exfoliated graphite oxide (MEGO) as the cathode, and all phenyl complex (APC) as electrolyte, are by quantitative kinetics analysis identified as a combination of diffusion-controlled reactions involving ether solvents (esols) and capacitive processes...
March 14, 2018: ACS Nano
Maria B Vazquez-Santos, Pedro Tartaj, Enrique Morales, Jose Manuel Amarilla
Here we summarize some results on the use of TiO2 nanostructures as anode materials for more efficient Li-ion (LIBs) and Na-ion (NIBs) batteries. LIBs are the leader to power portable electronic devices, and represent in the short-term the most adequate technology to power electrical vehicles, while NIBs hold promise for large storage of energy generated from renewable sources. Specifically, TiO2 an abundant, low cost, chemically stable and environmentally safe oxide represents in LIBs an alternative to graphite for applications in which safety is mandatory...
March 14, 2018: Chemical Record: An Official Publication of the Chemical Society of Japan ... [et Al.]
S P Rout, L Payne, S Walker, T Scott, P Heard, H Eccles, G Bond, P Shah, P Bills, B R Jackson, S A Boxall, A P Laws, C Charles, S J Williams, P N Humphreys
14 C is an important consideration within safety assessments for proposed geological disposal facilities for radioactive wastes, since it is capable of re-entering the biosphere through the generation of14 C bearing gases. The irradiation of graphite moderators in the UK gas-cooled nuclear power stations has led to the generation of a significant volume of14 C-containing intermediate level wastes. Some of this14 C is present as a carbonaceous deposit on channel wall surfaces. Within this study, the potential of biofilm growth upon irradiated and13 C doped graphite at alkaline pH was investigated...
March 13, 2018: Scientific Reports
Sadia Kabir, Kateryna Artyushkova, Alexey Serov, Plamen Atanassov
This study elucidates the synthesis-structure-property correlations of nitrogen moieties present in nitrogen functionalized graphene nanomaterials towards oxygen reduction reactions and their electrochemical pathways in acidic and alkaline electrolytes. Porous three-dimensional nitrogen-doped graphene nanosheets (N/3D-GNS) were fabricated using the Sacrificial Support Method (SSM) and doped with nitrogen using 10 at.% NH3 under thermal pyrolysis at T= 650°C, 850°C and 1050°C for evaluating the nitrogen species formed under different temperatures...
March 13, 2018: ACS Applied Materials & Interfaces
Raheel Akram, Muhammad Aizaz Ud Din, Sami Ullah Dar, Anila Arshad, Wei Liu, Zhanpeng Wu, Dezhen Wu
A hierarchical excavated iron-nitrogen codoped mesoporous carbon (Ex-FeN-MC) electrocatalyst has been successfully synthesized by pyrolysis of the unique ureidopyrimidinone containing organic precursor MAMIS by using silica as the mesoporous template and iron nitrate as the source of iron. The selected organic precursor has multifunctionalities with diverse distribution of nitrogen and oxygen species which constitute interesting features to prepare the Ex-FeN-MC electrocatalyst. The as-prepared Ex-FeN-MC material shows unexpectedly higher catalytic activities towards ORR/OER performances with an overpotential of 250 mV for OER in alkaline solution at a current density of 10 mA cm-2 , while the ORR activity is almost similar to that of commercial Pt/C...
March 12, 2018: Nanoscale
Sovik Das, Pritha Chatterjee, M M Ghangrekar
Electrosynthesis of multi-carbon compounds from the carbon dioxide present in biogas is a nascent approach towards purification of biogas. Microbial electrosynthesis (MES) cells, fabricated using different electrode materials, were operated using different electrolytes and mixed anaerobic culture as biocatalysts in the cathodic chamber under an applied cathode potential of -0.7 V vs standard hydrogen electrode (SHE). The rate of production of acetate, isobutyrate, propionate and 2-piperidinone from reduction of CO2 in the cathodic chamber of the MES was 0...
March 2018: Water Science and Technology: a Journal of the International Association on Water Pollution Research
Yaguang Zhang, Ning Du, Yifan Chen, Yangfan Lin, Jinwei Jiang, Yuanhong He, Yu Lei, Deren Yang
Si/C composite is one of the most promising candidate materials for next-generation lithium-ion battery anodes. Herein, we demonstrate the novel structure of carbon cages encapsulating porous Si synthesized by the reaction between magnesium silicide (Mg2 Si) and carbon dioxide (CO2 ) and subsequent acid washing. Benefitting from the in situ deposition through magnesiothermic reduction of CO2 , the carbon cage seals the inner Si completely and shows higher graphitization than that obtained from the decomposition of acetylene...
March 12, 2018: Nanoscale
Yang Zhang, Jiantao Zai, Kai He, Xuefeng Qian
Fe3 C nanoparticles encapsulated in 3D porous graphite frameworks are fabricated via a cost-effective and scalable in situ salt template method. Thanks to the highly graphitic protecting layer on Fe3 C nanoparticles and the 3D porous frameworks, the obtained materials exhibit excellent long-term durability and comparable electrocatalytic oxygen evolution activity with the state-of-the-art RuO2 catalyst.
March 12, 2018: Chemical Communications: Chem Comm
Ashish Kumar, Christian Schuerings, Suneel Kumar, Ajay Kumar, Venkata Krishnan
A novel graphitic carbon nitride (g-C3 N4 )-CaTiO3 (CTCN) organic-inorganic heterojunction photocatalyst was synthesized by a facile mixing method, resulting in the deposition of CaTiO3 (CT) nanoflakes onto the surface of g-C3 N4 nanosheets. The photocatalytic activity of the as-synthesized heterojunction (along with the controls) was evaluated by studying the degradation of an aqueous solution of rhodamine B (RhB) under UV, visible and natural sunlight irradiation. The CTCN heterojunction with 1:1 ratio of g-C3 N4 /CT showed the highest photocatalytic activity under sunlight irradiation and was also demonstrated to be effective for the degradation of a colorless, non-photosensitizing pollutant, bisphenol A (BPA)...
2018: Beilstein Journal of Nanotechnology
Xianqiang Tang, Qingyun Li, Zhenhua Wang, Yanping Hu, Yuan Hu, Miklas Scholz
Novel soil remediation equipment based on electro-kinetic geosynthetics (EKG) was developed for in situ isolation of metals from paddy soil. Two mutually independent field plot experiments A and B (with and without electric current applied) were conducted. After saturation using ferric chloride (FeCl3 ) and calcium chloride (CaCl2 ), soil water drainage capacity, soil cadmium (Cd) removal performance, energy consumption as well as soil residual of iron (Fe) and chloride (Cl) were assessed. Cadmium dissolved in the soil matrix and resulted in a 100% increase of diethylenetriamine-pentaacetic acid (DTPA) extracted phyto-available Cd...
March 10, 2018: Environmental Science and Pollution Research International
Chamteut Oh, Sangwoo Ji, Youngwook Cheong, Giljae Yim
In this research, an electrochemical wastewater treatment system, powered through the conversion of temperature difference into energy, was designed. The wastewater treatment system was applied to drainage flowing from two different mines, one contaminated by arsenic (As), the other ferrous iron (Fe2+ ). Arsenic was adsorbed on, or co-precipitated with, iron hydroxide generated from iron electrodes. A pseudo second order model well described the tendency for As removal. Ferrous iron oxidation occurred directly on graphite electrodes and followed a first order reaction model...
February 14, 2018: Journal of Hazardous Materials
Dinesh Pratap Singh, Carlos Eugenio Herrera, Brijesh Singh, Shipra Singh, Rajesh Kumar Singh, Rajesh Kumar
The two-dimensional (2D) derivative of graphite termed graphene has widespread applications in various frontiers areas of nanoscience and nanotechnologies. Graphene in its oxidized form named as graphene oxide (GO) has a mixed structure equipped with various oxygen containing functional groups (epoxy, hydroxyl, carboxylic and carbonyl etc.) provides attachment sites to various biological molecules including protein, deoxyribonucleic acid (DNA), ribonucleic acid (RNA) etc. The attached biological molecules with the help of functional groups make it a promising candidate in research field of biotechnological and biomedical applications...
May 1, 2018: Materials Science & Engineering. C, Materials for Biological Applications
Zhuang Guo, Hongbin Cao, Yuxian Wang, Yongbing Xie, Jiadong Xiao, Jin Yang, Yi Zhang
Three kinds of graphitic carbon nitride materials (bulk, porous and nanosheet g-C3 N4 ) were composited with a multiwall carbon nanotube (MWCNT) by a hydrothermal method, and the obtained b-C3 N4 /CNT, p-C3 N4 /CNT and n-C3 N4 /CNT materials were used in the electrodes for electro-peroxone process. It was found that the n-C3 N4 /CNT composite exhibited the highest efficiency in oxalate degradation, though it performed the worst in the oxygen-reduction reaction for H2 O2 production. The n-C3 N4 /CNT composite exhibited higher activity than CNT and other composites in catalytic ozonation experiments, due to the higher pyrrolic-N content modified on the CNT surface and higher surface area...
March 7, 2018: Chemosphere
Ruipeng Ren, Jing Ren, Yongkang Lv
Carbon nanomaterials, especially graphene and carbon nanotube, with high specific surface area, electrical conductivity and excellent mechanical flexibility have been considered as favorable alternatives to graphite anodes in Li-ion batteries. However, the limited Li ion storage sites within the sp2 carbon hexahedrons leads to the low storage capacity. Thus, the rational structure design is essential to prepare the high performance carbon-based anode materials. Here, we have used flexible single-wall carbon nanotubes (SWCNT) with ultra-high electrical conductivity to wrap the three-dimensional graphene foam (GF) by a facile dip-coating process to form the binary network structure...
March 10, 2018: Chemistry, An Asian Journal
Kashif Mairaj Deen, Edouard Asselin
The development of a hybrid system, capable of storing energy, and with the additional benefit of Cu extraction is discussed in this work. A fixed bed flow cell (FBFC) was used in which a composite negative electrode containing CuFeS2 (80 wt. %) and carbon black (20 wt. %) in graphite felt was separated from a positive (graphite felt) electrode by proton exchange membrane. The anolyte (0.2M H2SO4) and catholyte (0.5M Fe2+ in 0.2M H2SO4 with or without 0.1M Cu2+ addition) were circulated in the cell. With the addition of Cu2+ in the catholyte, the electrochemical activity of the Fe2+/Fe3+ redox couple over graphite felt was significantly improved...
March 8, 2018: ChemSusChem
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"