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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
Xuemei Wang, Wei Zhou, Chenlu Wang, Zilin Chen
Cotton fiber was proposed as a biodegradable support material. The properties like high specific area, hygroscopicity and adjustable shape make it be an idea substrate for solid phase extraction (SPE). In this work, inorganic layered double hydroxides (LDHs) were in situ immobilized onto cotton fiber through the linker of polydopamine as stationary phase. Uniform NiAl-LDHs crystal with nanostructure was observed on cotton fiber after one-step synthesis through urea hydrolytic method. The cotton fiber can not only increase the specific area and mass transfer rate, but also prevent aggregation and blocking of the freestanding LDHs crystal...
August 15, 2018: Talanta
Sara E Borrelli, Denis Walsh, Helen Spiby
OBJECTIVE: To explore first-time mothers' expectations of labour and birth, coping strategies they adopt during pregnancy towards childbirth and coping strategies they expect to use during labour and birth. DESIGN: A qualitative Straussian grounded theory methodology was adopted, with data collected through semi-structured interviews in the third trimester of pregnancy. Ethical approval was gained. Data analysis included the processes of coding and conceptualising data, with constant comparison between data, literature and memos...
May 7, 2018: Midwifery
Peiqi Wang, Tim Xu, Saowanee Ngamruengphong, Martin A Makary, Anthony Kalloo, Susan Hutfless
OBJECTIVE: Over 15 million colonoscopies and 7 million osophagogastroduodenoscopies (OGDs) are performed annually in the USA. We aimed to estimate the rates of infections after colonoscopy and OGD performed in ambulatory surgery centres (ASCs). DESIGN: We identified colonoscopy and OGD procedures performed at ASCs in 2014 all-payer claims data from six states in the USA. Screening mammography, prostate cancer screening, bronchoscopy and cystoscopy procedures were comparators...
May 18, 2018: Gut
Katherine Nowacki, Tondeleyo Gonzalez, Jennifer Mehnert, Amy Jacquemard, Amy Tyler
OBJECTIVES: Whiteboards are a valuable tool used to facilitate communication between families and the care team, but they were underused in our institution. Our aim was to increase families' knowledge of their child's plan of care, safety plan, and medical care team names by increasing the use of patient whiteboards with inpatient populations at a freestanding quaternary care children's hospital. METHODS: With this quality improvement study, we redesigned the whiteboard template to address the following 4 main barriers to use: (1) not having enough space to explain concepts to families, (2) having too much information to complete, (3) unclear roles of who completes the whiteboard, and (4) forgetting to update the whiteboard...
May 17, 2018: Hospital Pediatrics
Nathan M Krah, Jared Olson, Emily A Thorell, Lawanda Esquibel, Russell J Osguthorpe, Andrew T Pavia, Adam L Hersh
We examined clinical outcomes for 53 young infants (<3 months of age) treated with outpatient parenteral antimicrobial therapy after discharge from a freestanding children's hospital. None of the patients experienced treatment failure or disease progression; 9% of them experienced a catheter-related complication, but this percentage is not different than that for older children.
May 15, 2018: Journal of the Pediatric Infectious Diseases Society
Rakesh S Engineer, Seth R Podolsky, Baruch S Fertel, Purva Grover, Heather Jimenez, Erin L Simon, Courtney M Smalley
INTRODUCTION: The American College of Emergency Physicians embarked on the "Choosing Wisely" campaign to avoid computed tomographic (CT) scans in patients with minor head injury who are at low risk based on validated decision rules. We hypothesized that a Pediatric Mild Head Injury Care Path could be developed and implemented to reduce inappropriate CT utilization with support of a clinical decision support tool (CDST) and a structured parent discussion tool. METHODS: A quality improvement project was initiated for 9 weeks to reduce inappropriate CT utilization through 5 interventions: (1) engagement of leadership, (2) provider education, (3) incorporation of a parent discussion tool to guide discussion during the emergency department (ED) visit between the parent and the provider, (4) CDST embedded in the electronic medical record, and (5) importation of data into the note to drive compliance...
May 15, 2018: Pediatric Emergency Care
Stefan Wagner, Chanyoung Yim, Niall McEvoy, Satender Kataria, Volkan Yokaribas, Agnieszka Kuc, Stephan Pindl, Claus-Peter Fritzen, Thomas Heine, Georg S Duesberg, Max C Lemme
Two-dimensional (2D) layered materials are ideal for micro- and nanoelectromechanical systems (MEMS/NEMS) due to their ultimate thinness. Platinum diselenide (PtSe2 ), an exciting and unexplored 2D transition metal dichalcogenides (TMD) material, is particularly interesting because its scalable and low temperature growth process is compatible with silicon technology. Here, we explore the potential of thin PtSe2 films as electromechanical piezoresistive sensors. All experiments have been conducted with semi-metallic PtSe2 films grown by thermally assisted conversion of Pt at a CMOS-compatible temperature of 400°C...
May 16, 2018: Nano Letters
JiHyeon Hwang, Dong G Lee, Hyunki Yeo, Jingyi Rao, Zhiyuan Zhu, Jawon Shin, Keunsoo Jeong, Sehoon Kim, Hyun Wook Jung, Anzar Khan
Proton transfer polymerization between thiol and epoxide groups is shown to be an adaptable and utilitarian method for the synthesis of hydrogels. For instance, the polymerization catalyst can be organic or inorganic, and the polymerization medium can be pure water, buffer solutions, or organic solvents. The gelation mechanism can be triggered at ambient conditions, at a physiological temperature of 37 °C, or through using light as an external stimulus. The ambient and photochemical methods both allow for nanoimprint lithography to produce freestanding patterned thick films...
May 16, 2018: Journal of the American Chemical Society
Ali E Aliev, Daniel Codoluto, Ray H Baughman, Raquel Ovalle-Robles, Kanzan Inoue, Stepan A Romanov, Albert Nasibulin, Prashant Kumar, Shashank Priya, Nathanael K Mayo, John Blottman
The combination of smooth, continuous sound spectra produced by a sound source having no vibrating parts, a nanoscale thickness of a flexible active layer and the feasibility of creating large, conformal projectors provoke interest in thermoacoustic phenomena. However, at low frequencies, the sound pressure level and the sound generation efficiency of open carbon nanotube sheets (CNTS) is low. In addition, the nanoscale thickness of fragile heating elements, their high sensitivity to the environment and the high surface temperatures practical for thermoacoustic sound generation necessitate a protective encapsulation of freestanding CNTS in inert gases...
May 15, 2018: Nanotechnology
Jian-Gan Wang, Huanyan Liu, Hongzhen Liu, Wei Hua, Minhua Shao
Flexible membrane consisting of ultralong V2O5@conducting polypyrrole (V2O5@PPy) core-shell nanowires is prepared by a facile in situ interfacial synthesis approach. The V2O5 is for the first time demonstrated to show versatile function of reactive template to initiate the uniform and conformal polymerization of PPy nanocoating without the need for extra oxidants. The freestanding PPy-encapsulated V2O5 nanowire membrane is of great benefit in achieving strong electrochemical harvest by increasing electrical conductivity, shortening ion/electron transport distance, and enlarging electrode/electrolyte contact area...
May 15, 2018: ACS Applied Materials & Interfaces
Christopher Jay T Robidillo, Muhammad Amirul Islam, Maryam Aghajamali, Angelique Faramus, Regina Sinelnikov, Xiyu Zhang, Job Boekhoven, Jonathan G C Veinot
This study reports the preparation of functional bioinorganic hybrid materials exhibiting catalytic activity and photoluminescent properties arising from the combination of enzymes and freestanding silicon-based nanoparticles. The hybrid materials reported herein have potential applications in biological sensing/imaging and theranostics as they combine long-lived silicon-based nanoparticle photoluminescence with substrate-specific enzymatic activity. Thermal hydrosilylation of undecenoic acid and alkene-terminated poly(ethylene oxide) with hydride-terminated silicon nanocrystals afforded nanoparticles functionalized with a mixed surface made up of carboxylic acid and poly(ethylene oxide) moieties...
May 14, 2018: Langmuir: the ACS Journal of Surfaces and Colloids
Tran Quang Trung, Hoang Sinh Le, Thi My Linh Dang, Sanghyun Ju, Sang Yoon Park, Nae-Eung Lee
Fiber-based sensors integrated on textiles or clothing systems are required for the next generation of wearable electronic platforms. Fiber-based physical sensors are developed, but the development of fiber-based temperature sensors is still limited. Herein, a new approach to develop wearable temperature sensors that use freestanding single reduction graphene oxide (rGO) fiber is proposed. A freestanding and wearable temperature-responsive rGO fiber with tunable thermal index is obtained using simple wet spinning and a controlled graphene oxide reduction time...
May 11, 2018: Advanced Healthcare Materials
Chen Gu, Dandan Wu, Ming Wen, Qingsheng Wu
Herein, a new two-dimensional (2D) ultrathin-nanostructure of NiCu-SiO2 has been explored through synchronously assembling NiCu nanoparticles (∼6 nm) on the double surfaces of the freestanding SiO2 ultrathin membrane by the in situ reduction of the NiCuSiO3-hydroxide precursor under H2. These 2D ultrathin-nanostructures of NiCu-SiO2 have high surface area and extremely high stability of morphology and thus can well embed the in situ formed NiCu NPs to achieve excellent catalytic cycling stability. When the NiCu-SiO2 nanocomposite is used to catalyze the amination reaction of 4-nitrophenol, the reaction selectivity is as high as 99%, and no obvious performance decay appears after 20 cycles...
May 11, 2018: Dalton Transactions: An International Journal of Inorganic Chemistry
Anna Zink Eikeland, Marian Stingaciu, Aref Hasen Mamakhel, Matilde Saura-Múzquiz, Mogens Christensen
Nanocrystallites of the permanent magnetic material SrFe12 O19 were synthesised using a conventional sol-gel (CSG) and a modified sol-gel (MSG) synthesis route. In the MSG synthesis, crystallite growth takes place in a solid NaCl matrix, resulting in freestanding nanocrystallites, as opposed to the CSG synthesis, where the produced nanocrystals are strongly intergrown. The resulting nanocrystallites from both methods exhibit similar intrinsic magnetic properties, but significantly different morphology and degree of aggregation...
May 9, 2018: Scientific Reports
Kyle Marcus, Kun Liang, Wenhan Niu, Yang Yang
In this work, a combination of bottom-up electrochemical deposition and top-down electrochemical etching strategies followed by a subsequent sulfuration treatment was employed to rationally synthesize a nickel sulfide (NiS x ) freestanding holey film (FHF). Owing to the holey structure along with the optimal electrochemically active surface area and active sites, the as-prepared NiS x FHF showed an impressive bifunctional electrocatalytic performance toward both oxygen evolution and reduction reactions. The holey and freestanding features provide the NiS x FHF with promising characteristics to be used as an ideal air-breathing cathode in flexible Zn-air batteries (ZABs)...
May 10, 2018: Journal of Physical Chemistry Letters
Sunny Gupta, Alex Kutana, Boris I Yakobson
Two-dimensional single-layer boron (borophene) has emerged as a new material with several intriguing properties. Recently, the β12 polymorph of borophene was grown on Ag(111), and observed to host Dirac fermions. Similar to graphene, β12 borophene can be described as atom-vacancy pseudoalloy on a closed-packed triangular lattice; however, unlike graphene, the origin of its Dirac fermions is yet unclear. Here, using first-principles calculations we probe the origin of Dirac fermions in freestanding and Ag(111)-supported β12 borophene...
May 9, 2018: Journal of Physical Chemistry Letters
Caitlin W Elgarten, Staci D Arnold, Yimei Li, Yuan-Shung V Huang, Marcie L Riches, Jeffrey S Gerber, Richard Aplenc, Wael Saber, Brian T Fisher
OBJECTIVETo explore the prevalence and drivers of hospital-level variability in antibiotic utilization among hematopoietic cell transplant (HCT) recipients to inform antimicrobial stewardship initiatives.DESIGNRetrospective cohort study using data merged from the Pediatric Health Information System and the Center for International Blood and Marrow Transplant Research.SETTINGThe study included 27 transplant centers in freestanding children's hospitals.METHODSThe primary outcome was days of broad-spectrum antibiotic use in the interval from day of HCT through neutrophil engraftment...
May 8, 2018: Infection Control and Hospital Epidemiology
Pradip P Kamat, Leah N Bryan, Courtney E McCracken, Harold K Simon, John W Berkenbosch, Jocelyn R Grunwell
BACKGROUND: Children with autism spectrum disorder are challenging to sedate because of communication, sensory, and behavioral challenges. AIMS: The aim of this survey was to determine how procedural sedation is provided to children with autism spectrum disorders and whether sedation programs have specialized protocols for procedural sedation of these children. METHODS: We surveyed physician Medical Directors of sedation programs who are members of the Society for Pediatric Sedation, asking about practice characteristics and resource utilization during procedural sedation of children with autism spectrum disorders...
May 6, 2018: Paediatric Anaesthesia
Elizabeth Monsees, Lori Popejoy, Mary Anne Jackson, Brian Lee, Jennifer Goldman
BACKGROUND: Nursing has been called for greater participation in antibiotic stewardship. Although many of the functions that are integral to successful stewardship are within the scope of bedside nurses, data evaluating nursing engagement in stewardship are limited. The objective of this study was to identify nurses' roles and confidence in engaging in stewardship practices by conducting a survey of pediatric staff nurses employed at a 354-bed freestanding children's hospital with a well-established prospective audit and feedback stewardship program...
May 2, 2018: American Journal of Infection Control
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