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Tianyi Ma, Xiangnan Yu, Huiyu Li, Wenguang Zhang, Xiaolu Cheng, Wentao Zhu, Xinping Qiu
A novel design of hollow structured SnO2@Si nanospheres was presented, which not only demonstrates high volumetric capacity as anode of LIBs, but also prevents aggregation of Sn and confines solid electrolyte interphase thickening. An impressive volumetric specific capacity of 1030 mAh cm-3 was maintained after 500 cycles. The electrochemical impedance spectroscopy and differential scanning calorimetry indicated that solid electrolyte interphase can be confined in pores of as-prepared hollow structured SnO2@Si...
May 24, 2017: Nano Letters
Yanying Lu, Ning Zhang, Shuang Jiang, Yudong Zhang, Meng Zhou, Zhanliang Tao, Lynden A Archer, Jun Chen
The key challenge for high performance sodium-ion batteries is the exploitation of appropriate electrode materials with long cycling stability and high rate capability. Here, we report Sb2S5 nanoparticles (~ 5 nm) uniformly encapsulated in three-dimensional (3D) porous graphene foam, which were fabricated by a facile hydrothermal co-assembly strategy, as a high-performance anode material for sodium-ion batteries. The as-prepared composite can be directly used as electrodes without adding binder or current collector, exhibiting outstanding electrochemical performance with high reversible capacity (845 mAh g-1 at 0...
May 23, 2017: Nano Letters
Dingchang Lin, Yayuan Liu, Wei Chen, Guangmin Zhou, Kai Liu, Bruce S Dunn, Yi Cui
Research on lithium (Li) metal chemistry has been rapidly gaining momentum nowadays not only because of the appealing high theoretical capacity, but also its indispensable role in the next-generation Li-S and Li-air batteries. However, two root problems of Li metal, namely high reactivity and infinite relative volume change during cycling, bring about numerous other challenges that impede its practical applications. In the past, extensive studies have targeted these two root causes by either improving interfacial stability or constructing a stable host...
May 23, 2017: Nano Letters
Daniel Scott Charles, Mikhail Feygenson, Katharine Page, Joerg Neuefeind, Wenqian Xu, Xiaowei Teng
Aqueous electrochemical energy storage devices using potassium-ions as charge carriers are attractive due to their superior safety, lower cost and excellent transport properties compared to other alkali ions. However, the accommodation of potassium-ions with satisfactory capacity and cyclability is difficult because the large ionic radius of potassium-ions causes structural distortion and instabilities even in layered electrodes. Here we report that water induces structural rearrangements of the vanadium-oxygen octahedra and enhances stability of the highly disordered potassium-intercalated vanadium oxide nanosheets...
May 23, 2017: Nature Communications
Shyamalika Gopalan, Oana Carja, Maud Fagny, Etienne Patin, Justin W Myrick, Lisa M McEwen, Sarah M Mah, Michael S Kobor, Alain Froment, Marcus W Feldman, Lluis Quintana-Murci, Brenna M Henn
Aging is associated with widespread changes in genome-wide patterns of DNA methylation. Thousands of CpG sites whose tissue-specific methylation levels are strongly correlated with chronological age have been previously identified. However, the majority of these studies have focused primarily on cosmopolitan populations living in the developed world; it is not known if age-related patterns of DNA methylation at these loci are similar across a broad range of human genetic and ecological diversity. We investigated genome-wide methylation patterns using saliva- and whole blood-derived DNA from two traditionally hunting and gathering African populations: the Baka of the western Central African rainforest and the ≠Khomani San of the South African Kalahari Desert...
May 22, 2017: Genetics
Hiroo Madarame, Miyoko Saito, Kikumi Ogihara, Hideharu Ochiai, Mami Oba, Tsutomu Omatsu, Yuzo Tsuyuki, Tetsuya Mizutani
A 33-month old, neutered female Abyssinian cat died. The cat had sudden onset of widespread neurologic signs about half a year after birth. Mycobacterium avium subsp. hominissuis (MAH) group was isolated and identified from the brain of a cat affected with pyogranulomatous meningoencephalitis. The central nervous system (CNS) was involved in the disseminated MAH infection. MAH infection should be considered in cats with neurologic signs in regard to zoonotic aspects. Comparatively, this is a first case of MAH infection observed in the brain in either humans or animals...
May 2017: Veterinary Microbiology
Yihang Liu, Anyi Zhang, Chenfei Shen, Qingzhou Liu, Xuan Cao, Yuqiang Ma, Liang Chen, Christian Lau, Tian-Chi Chen, Fei Wei, Chongwu Zhou
Sodium-ion batteries offer an attractive option for potential low cost and large scale energy storage due to the earth abundance of sodium. Red phosphorus is considered as a high capacity anode for sodium-ion batteries with a theoretical capacity of 2596 mAh/g. However, similar to silicon in lithium-ion batteries, several limitations such as large volume expansion upon sodiation/de-sodiation and low electronic conductance have severely limited the performance of red phosphorus anodes. In order to address the above challenges, we have developed a method to deposit red phosphorus nano-dots densely and uniformly onto reduced graphene oxide sheets (P@RGO) to minimize the sodium ion diffusion length and the sodiation/de-sodiation stresses, and the RGO network also serves as electron pathway and creates free space to accommodate the volume variation of phosphorus particles...
May 22, 2017: ACS Nano
Christopher F Lowe, Michael Payne, David Puddicombe, Allison Mah, Davie Wong, Allison Kirkwood, Mark W Hull, Victor Leung
BACKGROUND: The purpose of this study was to implement a targeted antimicrobial stewardship intervention for patients with a viral respiratory tract infection. METHODS: This was a quasi-experimental before and after audit and feedback intervention of adult inpatients with a positive polymerase chain reaction for a respiratory virus in 2 acute care hospitals in Vancouver, Canada. Audit and feedback was implemented based on 2 criteria: microbiology (no positive bacterial cultures) and chest imaging (absence of pneumonia or consolidation on radiology dictation)...
May 16, 2017: American Journal of Infection Control
Kevin D Hill, Donald P Frush, B Kelly Han, Brian G Abbott, Aimee K Armstrong, Robert A DeKemp, Andrew C Glatz, S Bruce Greenberg, Alexander Sheldon Herbert, Henri Justino, Douglas Mah, Mahadevappa Mahesh, Cynthia K Rigsby, Timothy C Slesnick, Keith J Strauss, Sigal Trattner, Mohan N Viswanathan, Andrew J Einstein
There is a need for consensus recommendations for ionizing radiation dose optimization during multi-modality medical imaging in children with congenital and acquired heart disease (CAHD). These children often have complex diseases and may be exposed to a relatively high cumulative burden of ionizing radiation from medical imaging procedures including cardiac computed tomography, nuclear cardiology studies and fluoroscopically guided diagnostic and interventional catheterization and electrophysiology procedures...
May 17, 2017: JACC. Cardiovascular Imaging
Abdul-Rahman O Raji, Rodrigo Villegas Salvatierra, Nam Dong Kim, Xiujun Fan, Yilun Li, Gladys A L Silva, Junwei Sha, James M Tour
The drive for significant advancement in battery capacity and energy density inspired a revisit to the use of Li metal anode. We report the use of a seamless graphene-carbon nanotube (GCNT) electrode to reversibly store Li metal with complete dendrite formation suppression. The GCNT-Li capacity of 3351 mAh g(-1)GCNT-Li approaches that of bare Li metal (3861 mAh g-(1)Li), indicating the low contributing mass of GCNT, while yielding a practical areal capacity up to 4 mAh cm-2 and cycle stability. A full battery based on GCNT-Li/sulfurized carbon (SC) is demonstrated with high energy density (752 Wh kg(-1)total electrodes, where total electrodes = GCNT-Li + SC + binder), high areal capacity (2 mAh cm(-2)), cyclability (80% retention at > 500 cycles) and is free of Li polysulfides and dendrites that would cause severe capacity fade...
May 16, 2017: ACS Nano
Han-Chi Wang, Chao-Ying Fan, Yan-Ping Zeng, Xiao-Hua Zhang, Wen-Hao Li, Si-Yu Liu, Hai-Zhu Sun, Jingping Zhang, Ling-Na Sun, Xing-Long Wu
In this work, oxygen-deficient anatase TiO2 nanosheets (A-TiO2-xNSs) are proposed as the substrate to improve the electrochemical properties of sulfur electrodes for lithium-sulfur battery (Li-S batteries). The A-TiO2-xNSs are prepared via partly reducing the pristine TiO2 nanosheets (A-TiO2NSs) in the NaBH4 solution. With some oxygen vacancies on the surface of TiO2 nanosheets, A-TiO2-xNSs can not only promote the electronic transfer but also act as more effective polysulfide reservoirs to minimize the dissolution of lithium polysulfides (LiPSs) than the A-TiO2NSs control...
May 16, 2017: Chemistry: a European Journal
S K Mah, L Nettlefold, H M Macdonald, M Winters, D Race, C Voss, H A McKay
Today's 'backseat generation' of children is more often driven to school. Active school travel (AST) can contribute up to 30% of recommended daily physical activity. Although governed by a complex set of factors, parents are considered 'gatekeepers' of children's travel mode decisions. Therefore, we investigate the relationship between parental support and children's AST. Data were from Active Streets, Active People-Junior (British Columbia, Canada). Children self-reported travel mode to/from school for 1 week (10 trips)...
June 2017: Preventive Medicine Reports
Seong Jin An, Jianlin Li, Claus Daniel, Harry M Meyer, Stephen E Trask, Bryant J Polzin, David Lee Wood
This study aims to explore the correlations between electrolyte volume, electrochemical performance, and properties of the solid electrolyte interphase in pouch cells with Si-graphite composite anodes. The electrolyte is 1.2 M LiPF6 in ethylene carbonate:ethylmethyl carbonate with 10 wt.% fluoroethylene carbonate. Single layer pouch cells (100 mAh) were constructed with 15 wt.% Si-graphite / LiNi0.5Mn0.3CO0.2O2 electrodes. It is found that a minimum electrolyte volume factor of 3.1 times the total pore volume of cell components (cathode, anode, and separator) is needed for better cycling stability...
May 15, 2017: ACS Applied Materials & Interfaces
Shan Fang, Zhenkun Tong, Ping Nie, Gao Liu, Xiaogang Zhang
Adjusting the particle size and nanostructure or applying carbon materials as the coating layers is a promising method to hold the volume expansion of Si for its practical application in lithium-ion batteries (LIBs). Herein, the mild carbon coating combined with a molten salt reduction is precisely designed to synthesize raspberry-like hollow silicon spheres coated with carbon shells (HSi@C) as the anode materials for LIBs. The HSi@C exhibits a remarkable electrochemical performance; a high reversible specific capacity of 886...
May 24, 2017: ACS Applied Materials & Interfaces
Lillian Barra, Patrick Liang, Susanne M Benseler, David A Cabral, Aurore Fifi-Mah, Yueyang Li, Nataliya Milman, Marinka Twilt, Elaine Yacyshyn, Christian Pagnoux
OBJECTIVE: Takayasu arteritis (TAK) is a large vessel vasculitis that predominately affects young women and can cause severe ischemic complications. Given the rarity of TAK, the management of this condition is challenging. We aim to describe current rheumatologist practices for the management of TAK and identify discrepancies and gaps in knowledge. METHODS: An online survey (developed by the Canadian Vasculitis Network and approved by the Canadian Rheumatology Association) containing 48 questions with regard to the diagnosis, monitoring and treatment of TAK was distributed to 495 Canadian adult and pediatric rheu-matologists by email...
2017: Open Access Rheumatology: Research and Reviews
Anssi Karvonen, Anna Faltýnková, Jocelyn Mah Choo, E Tellervo Valtonen
Factors that drive parasite specificity and differences in infection dynamics among alternative host species are important for ecology and evolution of host-parasite interactions, but still often poorly known in natural systems. Here, we investigated spatiotemporal dynamics of infection, host susceptibility and parasite-induced changes in host phenotype in a rarely explored host-parasite system, the Australapatemon sp. trematode infecting two sympatric species of freshwater leeches, Erpobdella octoculata and Helobdella stagnalis...
May 15, 2017: Parasitology
Grace Flynn, Kumaranand Palaniappan, Martin Sheehan, Tadhg Kennedy, Kevin Ryan
Herein, we report the high density growth of lead seeded germanium nanowires (NWs) and their development into branched nanowire networks suitable for application as lithium ion battery anodes. The synthesis of the nanowires from lead seeds occurs simultaneously in both the liquid zone (SLS growth) and solvent rich vapor zone (VLS growth) of a high boiling point solvent growth system. The reaction is sufficiently versatile to allow for the growth of nanowires directly from either an evaporated catalyst layer or from pre-defined nanoparticle seeds and can be extended to allowing extensive branched nanowire formation in a secondary reaction where these seeds are coated onto existing wires...
May 12, 2017: Nanotechnology
Boyang Liu, Yunhui Gong, Kun Fu, Xiaogang Han, Yonggang Yao, Glenn Pastel, Chunpeng Yang, Hua Xie, Eric D Wachsman, Liangbing Hu
Garnet-type solid state electrolyte (SSE) is a promising candidate for high performance lithium (Li)-metal batteries due to its good stability and high ionic conductivity. One of the main challenges for garnet solid state batteries is the poor solid-solid contact between the garnet and electrodes, which results in high interfacial resistance, large polarizations, and low efficiencies in batteries. To address this challenge, in this work gel electrolyte is used as an interlayer between solid electrolyte and solid electrodes to improve their contact and reduce their interfacial resistance...
May 22, 2017: ACS Applied Materials & Interfaces
Sinho Choi, Jianjun Song, Chengyin Wang, Soojin Park, Guoxiu Wang
Free-standing trimethylolpropane ethoxylate triacrylate gel polymer electrolyte is synthesized by a chemical cross-linking process and used as an electrolyte and separator membrane in lithium-sulfur batteris. The cross linked gel polymer electrolyte also exhibited a stable geometric size retention of 95% at the high temperature of 130 oC. The as-prepared gel polymer electrolyte membrane with carbon nanofibers interlayer can effectively prevent polysulfide dissolution and shuttle effect, leading to significantly enhanced electrochemical properties including high capacity and cycling stability with an enhanced specific capacity of 790 mAh g-1 after 100 cycles...
May 12, 2017: Chemistry, An Asian Journal
Preeti Bhauriyal, Arup Mahata, Biswarup Pathak
Exploring a suitable electrode material is a fundamental step in the direction of the development of Al-ion battery for enhanced performance. In this work, we have explored the feasibility of single-walled carbon nanotubes (SWNTs) as a cathode material for Al-ion batteries using the density functional theory calculations. Carbon nanotubes with the hollow structures and large surface area overcome the difficulty of activating the opening of interlayer spaces as observed in graphite electrode during the first intercalation cycle...
May 11, 2017: Chemistry, An Asian Journal
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