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https://www.readbyqxmd.com/read/28637350/structural-peculiarities-of-ion-conductive-organic-inorganic-polymer-composites-based-on-aliphatic-epoxy-resin-and-salt-of-lithium-perchlorate
#1
Liubov Matkovska, Maksym Iurzhenko, Yevgen Mamunya, Igor Tkachenko, Valeriy Demchenko, Volodymyr Synyuk, Andriy Shadrin, Gisele Boiteux
The article is concerned with hybrid amorphous polymers synthesized basing on epoxy oligomer of diglycide aliphatic ester of polyethylene glycol that was cured by polyethylene polyamine and lithium perchlorate salt. Structural peculiarities of organic-inorganic polymer composites were studied by differential scanning calorimetry, wide-angle X-ray spectra, infrared spectroscopic, scanning electron microscopy, elemental analysis, and transmission and reflective optical microscopy. On the one hand, the results showed that the introduction of LiClO4 salt into epoxy polymer leads to formation of the coordinative metal-polymer complexes of donor-acceptor type between central Li(+) ion and ligand...
December 2017: Nanoscale Research Letters
https://www.readbyqxmd.com/read/28636826/degradation-mechanisms-of-magnesium-metal-anodes-in-electrolytes-based-on-cf3so2-2n-at-high-current-densities
#2
Hyun Deog Yoo, Sang-Don Han, Igor L Bolotin, Gene M Nolis, Ryan D Bayliss, Anthony K Burrell, John T Vaughey, Jordi Cabana
The energy density of rechargeable batteries utilizing metals as anodes surpasses Li-ion batteries, which employ carbon instead. Among possible metals, magnesium represents a potential alternative to the conventional choice, lithium, in terms of storage density, safety, stability, and cost. However, a major obstacle for metal-based batteries is the identification of electrolytes that show reversible deposition/dissolution of the metal anode and support reversible intercalation of ions into a cathode. Traditional Grignard-based Mg electrolytes are excellent toward reversible deposition of Mg, but their limited anodic stability and compatibility with oxide cathodes hinder their applicability in Mg batteries with higher voltage...
June 21, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28636822/electrochemical-properties-and-speciation-in-mg-hmds-2-based-electrolytes-for-magnesium-ion-batteries-as-a-function-of-ethereal-solvent-type-and-temperature
#3
Laura C Merrill, Jennifer L Schaefer
Magnesium batteries are a promising alternative to lithium-ion batteries due to the widespread abundance of magnesium and its high specific volumetric energy capacity. Ethereal solvents such as tetrahydrofuran (THF) are commonly used for magnesium-ion electrolytes due the chemical compatibility with magnesium metal, but the volatile nature of THF is a concern for practical application. Herein, we investigate magnesium bis(hexamethyldisilazide) plus aluminum chloride (Mg(HMDS)2-AlCl3) electrolytes in THF, diglyme, and tetraglyme at varying temperature...
June 21, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28636820/experimental-and-theoretical-study-of-ionic-pair-dissociation-in-lithium-ion-linear-polyethyleneimine-polyacrylonitrile-blend-for-solid-polymer-electrolytes
#4
Fernando Pignanelli, Mariano Romero, Ricardo Faccio, Álvaro W Mombrú
Herein, we report the preparation and characterization of novel polymeric blend between linear polyethylene imine (PEI) and polyacrylonitrile (PAN), with the purpose to facilitate the dissociation of lithium perchlorate salt (LiClO4) and thus to enhance Li-ion transport. It is a joint theoretical and experimental procedure for evaluating and thus demonstrating, the lithium salt dissociation. The procedure implies the correlation between theoretical pair distribution function (PDF) and conventional X-rays diffraction (XRD) by means of molecular dynamics (MD) approach...
June 21, 2017: Journal of Physical Chemistry. B
https://www.readbyqxmd.com/read/28636393/lithium-ion-coupled-electron-transfer-rates-in-superconcentrated-electrolytes-exploring-the-bottlenecks-for-fast-charge-transfer-rates-with-limn2o4-cathode-materials
#5
Victoria A Nikitina, Maxim V Zakharkin, Sergey Yu Vassiliev, Lada V Yashina, Evgeny V Antipov, Keith J Stevenson
The charge transfer kinetics of lithium ion intercalation into LixMn2O4 cathode materials was examined in dilute and concentrated aqueous and carbonate LiTFSI solutions using electrochemical methods. Distinctive trends in ion intercalation rates were observed between water-based and ethylene carbonate/diethyl carbonate solutions. The influence of the solution concentration on the rate of lithium ion transfer in aqueous media can be tentatively attributed to the process associated with Mn dissolution, while in carbonate solutions the rate is influenced by the formation of a concentration-dependent solid electrolyte interface (SEI)...
June 21, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28636354/rational-design-of-lithium-sulfur-battery-cathodes-based-on-experimentally-determined-maximum-active-material-thickness
#6
Michael J Klein, Gabriel M Veith, Arumugam Manthiram
Rational design of conductive carbon hosts for high energy density lithium-sulfur batteries requires an understanding of the fundamental limitations to insulating active material loading. In this work, we investigate the electrochemistry of lithium sulfide films ranging in thickness from 30 to 3500 nm. We show that films thicker than approximately 40 nm cannot be charged at local charge densities above 1 μA cm-2, and by implication, the maximum useful pore diameter is near 60 nm in a practical cathode. 'Activation' overpotentials for Li2S are identified in thicker films, resulting from polysulfide generation, but are shown not to improve the fundamental areal charge limitations...
June 21, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28635185/antipulverization-electrode-based-on-low-carbon-triple-shelled-superstructures-for-lithium-ion-batteries
#7
Lianhai Zu, Qingmei Su, Feng Zhu, Bingjie Chen, Huanhuan Lu, Chengxin Peng, Ting He, Gaohui Du, Pengfei He, Kai Chen, Shihe Yang, Jinhu Yang, Huisheng Peng
The realization of antipulverization electrode structures, especially using low-carbon-content anode materials, is crucial for developing high-energy and long-life lithium-ion batteries (LIBs); however, this technology remains challenging. This study shows that SnO2 triple-shelled hollow superstructures (TSHSs) with a low carbon content (4.83%) constructed by layer-by-layer assembly of various nanostructure units can withstand a huge volume expansion of ≈231.8% and deliver a high reversible capacity of 1099 mAh g(-1) even after 1450 cycles...
June 21, 2017: Advanced Materials
https://www.readbyqxmd.com/read/28634117/to-assess-the-effects-of-parathyroidectomy-tptx-versus-tptx-at-for-secondary-hyperparathyroidism-in-chronic-renal-failure-a-meta-analysis
#8
REVIEW
Nian-Cun Qiu, Si-Luo Zha, Miao-E Liu, Zhi-Peng Du, Yi-Fan Wang, Qiang Wang, Qi Chen, Ying Jiang, Cheng-Xiang Shan, Ming Qiu
BACKGROUND: Secondary Hyperparathyroidism (SHPT) requiring parathyroidectomy (PTX) occurs more commonly in patients with progressive chronic kidney disease and in those on long-term lithium therapy. Successful PTX often results in a dramatic drop of parathyroid hormone level, relieves the patient from clinical symptoms, and reduces mortality. However, there is an ongoing debate on the optimal surgical treatment of SHPT. Currently, no clinical guidelines or trials have definitely answered the question of whether Total Parathyroidectomy (TPTX) is superior or equal to Total Parathyroidectomy with Autotransplantation (TPTX + AT)...
June 17, 2017: International Journal of Surgery
https://www.readbyqxmd.com/read/28633526/reduced-graphene-oxide-poly-acrylic-acid-aerogels-as-a-three-dimensional-replacement-for-metal-foil-current-collectors-in-lithium-ion-batteries
#9
Han Xiao, Joshua P Pender, Mackenzie Meece-Rayle, J Pedro de Souza, Kyle C Klavetter, Heonjoo Ha, Jie Lin, Adam Heller, Christopher J Ellison, Charles Buddie Mullins
We report the synthesis and properties of a low-density (~5 mg/cm3) and highly-porous (99.6% void space) three-dimensional reduced graphene oxide (rGO)/poly(acrylic acid) (PAA) nanocomposite aerogel as the scaffold for cathode materials in lithium-ion batteries (LIBs). The rGO-PAA is both simple and starts from readily-available graphite and PAA thereby providing a scalable fabrication procedure. The scaffold can support as much as a 75 mg/cm2 loading of LiFePO4 (LFP) in a ~ 430 µm thick layer, and the porosity of the aerogel is tunable by compression; the flexible aerogel can be compressed 30-fold (i...
June 20, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28633406/in-saccharomyces-cerevisiae-gene-targeting-fidelity-depends-on-a-transformation-method-and-proportion-of-the-overall-length-of-the-transforming-and-targeted-dna
#10
Anamarija Štafa, Marina Svetec Miklenic, Antonio Zandona, Bojan Žunar, Neža Cadež, Hrvoje Petkovic, Ivan Krešimir Svetec
Gene replacement is one of the most essential approaches in construction of the genetically modified yeast strains. However, the fidelity of gene targeting and the effort needed for construction of a particular strain can vary significantly. We investigated the influence of two important factors-the choice of the transformation method and the design of the transforming DNA fragment, which can vary in overall length (including flanking regions and selectable marker) compared to the length of the targeted region in the genome...
June 15, 2017: FEMS Yeast Research
https://www.readbyqxmd.com/read/28633093/fracture-resistance-of-ceramic-and-polymer-based-occlusal-veneer-restorations
#11
Majed Al-Akhali, Mohamed Sad Chaar, Adham Elsayed, Abdulaziz Samran, Matthias Kern
OBJECTIVES: The purpose of this in vitro study was to evaluate the influence of thermodynamic loading on the durability and fracture resistance behavior of occlusal veneers fabricated from different biomedical dental CAD/CAM materials. METHODS: The occlusal surfaces of 64 extracted premolars were prepared in the enamel layer and restored with occlusal veneers with a fissure/cusp thickness of 0.5/0.8mm made from four different dental CAD/CAM materials: group LD lithium disilicate (e...
June 13, 2017: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/28632750/renal-sodium-handling-and-blood-pressure-changes-in-gestational-protein-restricted-offspring-role-of-renal-nerves-and-ganglia-neurokinin-expression
#12
Augusto H Custódio, Marcelo C de Lima, Bárbara Vaccari, Patrícia A Boer, José A R Gontijo
BACKGROUND: Considering long-term changes in renal sodium handling and blood pressure in maternal protein-restricted (LP) offspring, we assumed that the development of LP hypertension results from abnormal dorsal root ganglia (DRG) neurokinin expression associated with impaired responsiveness of renal sensory receptors, promoting a reduced urinary excretion of sodium. The present study investigates whether increased blood pressure in protein-restricted offspring would be associated with changes in the DRG cells and in renal pelvic wall expression of NK1R, SP and CGRP when compared to NP offspring...
2017: PloS One
https://www.readbyqxmd.com/read/28632270/silicon-anodes-protected-by-a-nitrogen-doped-porous-carbon-shell-for-high-performance-lithium-ion-batteries
#13
Jinhui Zhu, Jun Yang, Zhixin Xu, Jiulin Wang, Yanna Nuli, Xiaodong Zhuang, Xinliang Feng
Silicon (Si) anodes, which are among the most promising candidates for high-energy lithium-ion batteries (LIBs), have attracted considerable attention from both academic and industrial communities. However, Si anodes usually suffer from an inherently low conductivity and extremely large volume change during the lithiation and delithiation processes, and consequently exhibit an inferior rate capability and poor cycle life. In this paper, we report new porous polymer-derived carbon coated Si nanoparticles (NPs) as the next generation anodes for LIBs to overcome these serious problems...
June 20, 2017: Nanoscale
https://www.readbyqxmd.com/read/28632167/preparation-of-ce-and-la-doped-li%C3%A2-ti%C3%A2-o12-nanosheets-and-their-electrochemical-performance-in-li-half-cell-and-li%C3%A2-ti%C3%A2-o12-lifepo%C3%A2-full-cell-batteries
#14
Meng Qin, Yueming Li, Xiao-Jun Lv
This work reports on the synthesis of rare earth-doped Li₄Ti₅O12 nanosheets with high electrochemical performance as anode material both in Li half and Li₄Ti₅O12/LiFePO₄ full cell batteries. Through the combination of decreasing the particle size and doping by rare earth atoms (Ce and La), Ce and La doped Li₄Ti₅O12 nanosheets show the excellent electrochemical performance in terms of high specific capacity, good cycling stability and excellent rate performance in half cells. Notably, the Ce-doped Li₄Ti₅O12 shows good electrochemical performance as anode in a full cell which LiFePO₄ was used as cathode...
June 20, 2017: Nanomaterials
https://www.readbyqxmd.com/read/28631625/high-loading-fe2o3-swnt-composite-films-for-lithium-ion-battery-applications
#15
Ying Wang, Jiahui Guo, Li Li, Yali Ge, Baojun Li, Yingjiu Zhang, Yuanyuan Shang, Anyuan Cao
Single-walled carbon nanotube (SWNT) films are a potential candidate as porous conductive electrodes for energy conversion and storage; tailoring the loading and distribution of active materials grafted on SWNTs is critical for achieving maximum performance. Here, we show that as-synthesized SWNT samples containing residual Fe catalyst can be directly converted to Fe2O3/SWNT composite films by thermal annealing in air. The mass loading of Fe2O3 nanoparticles is tunable from 63 wt.% up to 96 wt.%, depending on the annealing temperature (from 450 C to 600 C), while maintaining the porous network structure...
June 20, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28631584/clinical-characterization-of-italian-suicide-attempters-with-bipolar-disorder
#16
Bernardo Dell'Osso, Matteo Vismara, Cristina Dobrea, Laura Cremaschi, Benedetta Grancini, Chiara Arici, Beatrice Benatti, Massimiliano Buoli, Terence A Ketter, A Carlo Altamura
Introduction Bipolar disorder (BD) is a chronic, highly disabling condition associated with psychiatric/medical comorbidity and substantive morbidity, mortality, and suicide risks. In prior reports, varying parameters have been associated with suicide risk. OBJECTIVES: To evaluate sociodemographic and clinical variables characterizing Italian individuals with BD with versus without prior suicide attempt (PSA). METHODS: A sample of 362 Italian patients categorized as BD according to the Diagnostic and Statistical Manual of Mental Disorders, Fourth Edition, Text Revision (DSM IV-TR) was assessed and divided in 2 subgroups: with and without PSA...
June 20, 2017: CNS Spectrums
https://www.readbyqxmd.com/read/28630486/integrated-optical-modulator-manipulating-the-polarization-and-rotation-handedness-of-orbital-angular-momentum-states
#17
S Faezeh Mousavi, Rahman Nouroozi, Giuseppe Vallone, Paolo Villoresi
Recent studies demonstrated that the optical channels encoded by Orbital Angular Momentum (OAM) are capable candidates for improving the next generation of communication systems. OAM states can enhance the capacity and security of high-dimensional communication channels in both classical and quantum regimes based on optical fibre and free space. Hence, fast and precise control of the beams encoded by OAM can provide their commercial applications in the compatible communication networks. Integrated optical devices are good miniaturized options to perform this issue...
June 19, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28629657/single-unit-implant-supported-restoration-adjacent-to-multiple-lithium-disilicate-restorations-an-approach-to-an-esthetic-challenge-a-clinical-report
#18
Gelareh Ronaghi, Winston Chee, Stephanie Yeung
This clinical report describes a method for predictably shade matching a highly opaque yttrium-stabilized tetragonal zirconia polycrystal (Y-TZP) implant restoration adjacent to relatively translucent lithium disilicate veneers in the maxillary anterior region. To achieve a satisfactory outcome, the milled Y-TZP abutment was layered with low-fusing feldspathic porcelain to match the stump shade of the adjacent prepared teeth; this layer subsequently facilitated adhesive bonding of a veneer to the abutment before insertion...
June 16, 2017: Journal of Prosthetic Dentistry
https://www.readbyqxmd.com/read/28629629/association-between-lithium-use-and-melanoma-risk-and-mortality-a-population-based-study
#19
Maryam M Asgari, Andy J Chien, Ai Lin Tsai, Bruce Fireman, Charles P Quesenberry
Laboratory studies show lithium, an activator of the Wnt/ß-catenin signaling pathway, slows melanoma progression, but no published epidemiologic studies have explored this association. We conducted a retrospective cohort study of adult white Kaiser Permanente Northern California members (n=2,213,848) from 1997-2012 to examine the association between lithium use and melanoma risk. Lithium exposure (n=11,317) was assessed from pharmacy databases, serum lithium levels were obtained from electronic laboratory databases, and incident cutaneous melanomas (n= 14,056) were identified from an established cancer registry...
June 16, 2017: Journal of Investigative Dermatology
https://www.readbyqxmd.com/read/28629296/atypical-antipsychotic-use-and-outcomes-in-an-urban-maternal-mental-health-service
#20
Susan Hatters Friedman, Charmian Moller-Olsen, Chandni Prakash, Abigail North
Objective Despite many women suffering from psychosis in their childbearing years, limited data exist about the use of atypical antipsychotic agents in pregnancy. Atypical antipsychotic agents are often used to treat bipolar disorder, instead of lithium or valproate because of the known teratogenicity of those agents. As well, atypical antipsychotics are often prescribed in anxiety disorders and depression. This study sought to describe pregnancy outcomes for women prescribed atypical antipsychotics during pregnancy...
August 2016: International Journal of Psychiatry in Medicine
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