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https://www.readbyqxmd.com/read/29786921/room-temperature-ferroelectricity-in-an-organic-cocrystal
#1
Adam J Matzger, Ren A Wiscons, Nagula Rajesh Goud, Joshua T Damron
Ferroelectric materials exhibit switchable remanent polarization due to reversible symmetry breaking under an applied electric field. Previous research has leveraged temperature-induced neutral-ionic transitions in charge-transfer (CT) cocrystals to access ferroelectrics that operate through displacement of molecules under an applied field. However, displacive ferroelectric behavior is rare in organic CT cocrystals and achieving a Curie temperature (TC) above ambient has been elusive. Here a cocrystal between acenaphthene and 2,3,5,6-tetrafluoro-7,7,8,8-tetracyanoquinodimethane is presented that shows switchable remanent polarization at room temperature (TC = 68°C)...
May 22, 2018: Angewandte Chemie
https://www.readbyqxmd.com/read/29786915/reversible-oxidative-addition-reductive-elimination-of-si-h-bond-to-base-stabilized-silylenes-a-theoretical-insight
#2
Tsuyoshi Kato, Masayuku Nakagaki, Antoine Baceiredo, Shigeyoshi Sakaki
Although oxidative addition (O.A.) and reductive elimination (R.E.) are exceedingly important processes in organometallic chemistry, such processes are still extremely rare for main group element species. Here we report a theoretical study on the reaction of phosphine-stabilized silylenes with silanes which proceeds via reversible O.A./R.E. at room temperature. Of particular interest, this theoretical approach highlights the important role of the ligand, which can greatly affect kinetics and energy balance of the reaction...
May 22, 2018: Chemistry: a European Journal
https://www.readbyqxmd.com/read/29786906/reversible-c-h-activation-facile-b-c-b-h-metathesis-and-apparent-hydroboration-catalysis-by-a-xanthene-based-frustrated-lewis-pair
#3
Petra Vasko, Ili A Zulkifly, M Ángeles Fuentes, Zhenbo Mo, Jamie Hicks, Paul C J Kämer, Simon Aldridge
A dimethylxanthene-based phosphine/borane frustrated Lewis pair (FLP) is shown to effect reversible C-H activation, cleaving phenylacetylene, PhCCH, to give an equilibrium mixture of the free FLP and phosphonium acetylide in CD₂Cl₂ solution at room temperature. This system also reacts with B-H bonds although in a different fashion: reactions with HBpin and HBcat proceed via C-B/B-H metathesis, leading to replacement of the -B(C₆F₅)₂ Lewis acid component by -Bpin/-Bcat, and transfer of HB(C₆F₅)₂ to the phosphine Lewis base...
May 22, 2018: Chemistry: a European Journal
https://www.readbyqxmd.com/read/29786732/unusually-low-thermal-conductivity-of-atomically-thin-2d-tellurium
#4
Zhibin Gao, Fang Tao, Jie Ren
Tellurium is a high-performance thermoelectric material due to its superior electronic transport and low lattice thermal conductivity (κL). Here, we report the ultralow κL in the monolayer tellurium, i.e., tellurene, which has been successfully synthesized in recent experiments. We find that tellurene has a compellingly low room temperature κL of 2.16 and 4.08 W m-1 K-1 along the armchair and zigzag directions, respectively, which is lower than any reported values for other 2D materials. We attribute this unusually low κL to the soft acoustic modes, the extremely low-energy optical modes and the strong scattering among optical-acoustic phonons, which place tellurene as a potential novel thermoelectric material...
May 22, 2018: Nanoscale
https://www.readbyqxmd.com/read/29786731/regioselective-and-diastereoselective-synthesis-of-two-functionalized-1-5-methanoindeno-1-2-d-azocines-via-a-three-component-reaction
#5
Jun Cao, Jing Sun, Chao-Guo Yan
The morpholine promoted three-component reaction of N-alkylpiperidinone, indane-1,3-dione and 2-arylideneindane-1,3-dione in ethanol at room temperature resulted in the (1H-1,5-methanoindeno[1,2-d]azocin-12-ylidene)-1H-indene-1,3(2H)-dione derivatives in good yields and with exo-configuration. Under similar conditions, the reaction of N-alkylpiperidinone with 2-arylideneindane-1,3-dione afforded 7H-1,5-methanoindeno[1,2-d]azocine-7,12-diones with endo-configuration. The domino reaction is believed to proceed with domino Knoevenagel condensation, Michael addition and aldol condensation reaction...
May 22, 2018: Organic & Biomolecular Chemistry
https://www.readbyqxmd.com/read/29786661/suspended-carbon-nanotubes-for-humidity-sensing
#6
Shivaram Arunachalam, Anubha A Gupta, Ricardo Izquierdo, Frederic Nabki
A room temperature microfabrication technique using SU8, an epoxy-based highly functional photoresist as a sacrificial layer, is developed to obtain suspended aligned carbon nanotube beams. The humidity-sensing characteristics of aligned suspended single-walled carbon nanotube films are studied. A comparative study between suspended and non-suspended architectures is done by recording the resistance change in the nanotubes under humidity. For the tests, the humidity was varied from 15% to 98% RH. A comparative study between suspended and non-suspended devices shows that the response and recovery times of the suspended devices was found to be almost 3 times shorter than the non-suspended devices...
May 22, 2018: Sensors
https://www.readbyqxmd.com/read/29786610/thermoelectric-transport-properties-of-ti-doped-adsorbed-monolayer-blue-phosphorene
#7
Lin Zhu, Bowen Li, Kailun Yao
Thermoelectric transport properties of Ti doped or adsorbed monolayer blue phosphorene are investigated by density functional theory calculations combined with the nonequilibrium Green's function formalism. The thermal giant magnetoresistance and a nearly 100% spin polarization which solely relies on the temperature gradient of electrodes without bias or gate voltage are observed. Moreover, the spin Seebeck effect is also found. Furthermore, taking into account the electronic and phonon dispersion, the thermoelectric merit for Ti doping in the monolayer blue phosphorene at room temperature is also studied, the maximum value of thermoelectric merit can reach 1...
May 22, 2018: Nanotechnology
https://www.readbyqxmd.com/read/29786606/crystal-and-magnetic-structure-of-antiferromagnetic-mn-sub-2-sub-ptpd
#8
Vivek Kumar, Manfred Reehuis, Andreas Hoser, Peter Adler, Claudia Felser
We have investigated the crystal and magnetic structure of Mn<sub>2</sub>PtPd alloy using powder X-ray and neutron diffraction experiments. This compound is believed to belong to the Heusler family having crystal symmetry I4/mmm (TiAl<sub>3</sub>-type). However, in this work we found that the Pd and Pt atoms are disordered and thus Mn<sub>2</sub>PtPd crystallizes in the L1<sub>0</sub> structure having P4/mmm symmetry (CuAu-I type) like MnPt and MnPd binary alloys...
May 22, 2018: Journal of Physics. Condensed Matter: An Institute of Physics Journal
https://www.readbyqxmd.com/read/29786439/a-class-of-amide-ligands-enable-cu-catalyzed-coupling-of-hetero-aryl-halides-with-sulfinic-acid-salts-under-mild-conditions
#9
Jinlong Zhao, Songtao Niu, Xi Jiang, Yongwen Jiang, Xiaojing Zhang, Tiemin Sun, Dawei Ma
The amide derived from 4-hydroxy-L-proline and 2,6-dimethylaniline is a powerful ligand for Cu-catalyzed coupling of (hetero)aryl halides with sulfinic acid salts, allowing the formation of a wide range of (hetero)aryl sulfones from the corresponding (hetero)aryl halides at considerably low catalytic loadings. The coupling of (hetero)aryl iodides and sodium methanesulfinate proceeds at room temperature with only 0.5 mol % CuI and ligand, representing the first example for Cu-catalyzed arylation at both low catalytic loading and room temperature...
May 22, 2018: Journal of Organic Chemistry
https://www.readbyqxmd.com/read/29785972/a-methodology-to-objectively-assess-the-performance-of-sound-field-amplification-systems-demonstrated-using-50-physical-simulations-of-classroom-conditions
#10
Stephen Dance, Bradford Backus, Lorenzo Morales
Introduction: The effect of a sound reinforcement system, in terms of speech intelligibility, has been systematically determined under realistic conditions. Different combinations of ambient and reverberant conditions representative of a classroom environment have been investigated. Materials and Methods: By comparing the measured speech transmission index metric with and without the system in the same space under different room acoustics conditions, it was possible to determine when the system was most effective...
May 2018: Noise & Health
https://www.readbyqxmd.com/read/29785703/a-cross-sectional-study-evaluating-the-use-of-free-clinics-in-syracuse-ny-patient-demographics-and-barriers-to-accessing-healthcare-in-traditional-settings
#11
Simone Arvisais-Anhalt, Matthew MacDougall, Michael Rosenthal, Peter Congelosi, Daniel F Farrell, Paula Rosenbaum
Free clinics provide healthcare to underserved patient populations, playing a critical role in the medical safety-net. Syracuse, New York has notable racial, socioeconomic, and educational disparities and is home to four free clinics. Little is known about these clinics' patient population. This study attempts to better define this population and the barriers they face accessing traditional care. We developed a 27-question survey investigating patient demographics, barriers to traditional healthcare, and experience at local free clinics...
May 21, 2018: Journal of Community Health
https://www.readbyqxmd.com/read/29785617/heat-shock-but-not-temperature-is-a-biological-trigger-for-the-exsheathment-of-third-stage-larvae-of-haemonchus-contortus
#12
Kiliana Bekelaar, Tania Waghorn, Michael Tavendale, Catherine McKenzie, Dave Leathwick
Gastrointestinal parasites are an important health issue in grazing ruminants. Understanding the processes involved in the transition from the free living to the parasitic life stage of these nematodes is one avenue to identifying new targets amenable to future intervention. The transition to parasitism is initiated by exsheathment and is triggered by the sudden change in environment after ingestion of the infective larva by the host. Two major changes in environment are the increases in temperature and carbon dioxide (CO2 ) levels...
May 21, 2018: Parasitology Research
https://www.readbyqxmd.com/read/29785586/suicide-by-plastic-bag-suffocation-combined-with-the-mixture-of-citric-acid-and-baking-soda-in-an-adolescent
#13
Keishu Murakami, Takashi Kawaguchi, Yumiko Hashizume, Kengo Kitamura, Misato Okada, Kohei Okumoto, Shoich Sakamoto, Yuko Ishida, Mizuho Nosaka, Akihiko Kimura, Akihiro Takatsu, Toshikazu Kondo
We describe a case of suicidal asphyxiation using a plastic bag combined with carbon dioxide (CO2 ) gas. A 20-year-old male, whose head was covered with a plastic bag, was found dead in his room. In the plastic bag, there were two glass-made cups containing liquid-like substance. Through crime scene investigation by police staffs, a bottle of citric acid and a box of baking soda were also discovered in his room. The forensic autopsy revealed that there were neither lesions nor injuries in all of the organs...
May 22, 2018: International Journal of Legal Medicine
https://www.readbyqxmd.com/read/29785458/high-resolution-standardization-reduces-delay-due-to-workflow-disruptions-in-laparoscopic-cholecystectomy
#14
Marco von Strauss Und Torney, Sohelia Aghlmandi, Jasmin Zeindler, Debora Nowakowski, Christian A Nebiker, Christoph Kettelhack, Rachel Rosenthal, Raoul A Droeser, Savas D Soysal, Henry Hoffmann, Robert Mechera
BACKGROUND: Optimal resource utilization in high-cost environments like operating theatres is fundamental in today's cost constrained health care systems. Interruptions of the surgical workflow, i.e. microcomplications (MC), lead to prolonged procedure times and higher costs and can be indicative of surgical mistakes. Reducing MC can improve operating room efficiency and prevent intraoperative complications. We, therefore, aimed to evaluate the impact of a high-resolution standardized laparoscopic cholecystectomy protocol (HRSL) on operative time and intraoperative interruptions in a teaching hospital...
May 21, 2018: Surgical Endoscopy
https://www.readbyqxmd.com/read/29785327/ex-vivo-confocal-microscopy-an-emerging-technique-in-dermatology
#15
Elisa Cinotti, Jean Luc Perrot, Bruno Labeille, Frédéric Cambazard, Pietro Rubegni
This review aims to give an overview of the current available applications of ex vivo confocal microscopy (EVCM) in dermatology. EVCM is a relatively new imaging technique that allows microscopic examination of freshly excised unfixed tissue. It enables a rapid examination of the skin sample directly in the surgery room and thus represents an alternative to the intraoperative micrographic control of the surgical margins of cutaneous tumors by standard microscopic examination on cryopreserved sections during Mohs surgery...
April 2018: Dermatology Practical & Conceptual
https://www.readbyqxmd.com/read/29785158/obtaining-adequate-surgical-margin-status-in-breast-conservation-therapy-intraoperative-ultrasound-guided-resection-versus-specimen-mammography
#16
Maria Mihaela Pop, Silviu Cristian, Orsolya Hanko-Bauer, Dana Valentina Ghiga, Rares Georgescu
Background and aim: The purpose of breast-conserving surgery (BCS) for women with cancer is to perform an oncological radical procedure with disease-free margins at the final histological assessment and with the best aesthetic result possible. Intraoperative resected specimen ultrasound and intraoperative resected specimen mammography may reduce the rates of positive margins and reexcision among patients undergoing conserving therapy. Our objective is to compare the two methods with the histopathological results for a preset cut off and asses which parameters can influence the positive margin status...
2018: Clujul Medical (1957)
https://www.readbyqxmd.com/read/29784929/on-wafer-fabrication-of-cavity-mirrors-for-ingan-based-laser-diode-grown-on-si
#17
Junlei He, Meixin Feng, Yaozong Zhong, Jin Wang, Rui Zhou, Hongwei Gao, Yu Zhou, Qian Sun, Jianxun Liu, Yingnan Huang, Shuming Zhang, Huaibing Wang, Masao Ikeda, Hui Yang
Direct bandgap III-V semiconductor lasers grown on silicon (Si) are highly desired for monolithic integration with Si photonics. Fabrication of semiconductor lasers with a Fabry-Pérot cavity usually includes facet cleavage, however, that is not compatible with on-chip photonic integration. Etching as an alternative approach holds a great advantage in preparing cavity mirrors with no need of breaking wafer into bars. However, gallium nitride (GaN) sidewalls prepared by dry etching often have a large roughness and etching damages, which would cause mirror loss due to optical scattering and carrier injection loss because of surface non-radiative recombination...
May 21, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29784909/large-quantum-spin-hall-gap-in-single-layer-1t-wse-2
#18
P Chen, Woei Wu Pai, Y-H Chan, W-L Sun, C-Z Xu, D-S Lin, M Y Chou, A-V Fedorov, T-C Chiang
Two-dimensional (2D) topological insulators (TIs) are promising platforms for low-dissipation spintronic devices based on the quantum-spin-Hall (QSH) effect, but experimental realization of such systems with a large band gap suitable for room-temperature applications has proven difficult. Here, we report the successful growth on bilayer graphene of a quasi-freestanding WSe2 single layer with the 1T' structure that does not exist in the bulk form of WSe2 . Using angle-resolved photoemission spectroscopy (ARPES) and scanning tunneling microscopy/spectroscopy (STM/STS), we observe a gap of 129 meV in the 1T' layer and an in-gap edge state located near the layer boundary...
May 21, 2018: Nature Communications
https://www.readbyqxmd.com/read/29784549/cost-implications-of-varying-the-surgical-technique-surgical-setting-and-anesthesia-type-for-carpal-tunnel-release-surgery
#19
Nikolas H Kazmers, Angela P Presson, Yizhe Xu, Abby Howenstein, Andrew R Tyser
PURPOSE: Carpal tunnel release (CTR) is a common surgical procedure, representing a financial burden to the health care system. The purpose of this study was to test whether the choice of CTR technique (open carpal tunnel release [OCTR] vs endoscopic carpal tunnel release [ECTR]), surgical setting (operating room vs procedure room [PR]), and anesthetic type (local, monitored anesthesia care [MAC], Bier block, general) affected costs or payments. METHODS: Consecutive adult patients undergoing isolated unilateral CTR between July 2014, and October 2017, at a single academic medical center were identified...
May 18, 2018: Journal of Hand Surgery
https://www.readbyqxmd.com/read/29784354/a-comparative-study-of-sterically-and-electro-statically-stabilized-silver-nanoparticles-for-the-determination-of-muscle-relaxant-tizanidine-insights-of-localized-surface-plasmon-resonance-surface-enhanced-raman-spectroscopy-and-electrocatalytic-activity
#20
Marwa R El-Zahry
A comparative study of two types of silver nanoparticles was investigated. The effect of the surface chemistry of the studied silver nanoparticles (AgNPs) on their localized surface plasmon resonance was utilized for the quantitative determination of muscle relaxant tizanidine drug. The studied AgNPs are classified according to the type of stabilizing agent used in their synthesis into electrostatically and sterically stabilized AgNPs. The electrostatically-stabilized AgNPs (AA AgNPs) were prepared using ascorbic acid as both reducing and protective agents in alkaline medium...
August 15, 2018: Talanta
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