keyword
MENU ▼
Read by QxMD icon Read
search

Split prep

keyword
https://www.readbyqxmd.com/read/29148711/rational-manipulation-of-iro2-lattice-strain-on-%C3%AE-mno2-nanorods-as-a-highly-efficient-water-splitting-catalyst
#1
Wei Sun, Zhenhua Zhou, Waqas Qamar Zaman, Li-Mei Cao, Ji Yang
Developing more efficient and stable oxygen evolution reaction (OER) catalysts is critical for future energy conversion and storage technologies. We demonstrate that inducing a lattice strain in IrO2 crystal structure due to interface lattice mismatch enables an enhancement of the OER catalytic activity. The lattice strain is obtained by the direct growth of IrO2 nanoparticles on a specially exposed surface of α-MnO2 nanorods via a simple two-step hydrothermal synthesis. Interestingly, the prepared hydride OER activity increases with a lower IrO2 grown mass, which offers an opportunity to reduce the usage of precious iridium and ultimately obtains a specific mass activity of 3...
November 17, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29148703/bond-energy-driven-low-high-angle-grain-boundary-movement-mediated-porous-se-te-synthesis-for-water-splitting-reaction
#2
Anup Kumar Sasmal, Arpan Kumar Nayak, Prashant Kartikeya, Debabrata Pradhan, Tarasankar Pal
Herein, for the first time we applied metal-metal bond energy factor for the evolution of porous Se-Te alloy. Porous Se-Te material has been prepared from their elemental states only through heating-cooling process in silicone oil without using any reagent, surfactant or capping agent. Surprisingly the reaction occurred at much lower temperature (240 °C) than the m.p. (450 °C) of Te0. The nucleation and growth have been clarified by means of varied bond energy for the first time. Difference in bond energy between hetero metal-metal bond (Se-Te) and homo metal-metal (Se-Se) directs nucleation and growth towards the fabrication of porous structure even from their elemental state where low angle grain boundary (LAGB) and high angle grain boundary (HAGB) movements play their governing roles...
November 17, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29146811/state-to-state-chemistry-for-three-body-recombination-in-an-ultracold-rubidium-gas
#3
Joschka Wolf, Markus Deiß, Artjom Krükow, Eberhard Tiemann, Brandon P Ruzic, Yujun Wang, José P D'Incao, Paul S Julienne, Johannes Hecker Denschlag
Experimental investigation of chemical reactions with full quantum state resolution for all reactants and products has been a long-term challenge. Here we prepare an ultracold few-body quantum state of reactants and demonstrate state-to-state chemistry for the recombination of three spin-polarized ultracold rubidium (Rb) atoms to form a weakly bound Rb2 molecule. The measured product distribution covers about 90% of the final products, and we are able to discriminate between product states with a level splitting as small as 20 megahertz multiplied by Planck's constant...
November 17, 2017: Science
https://www.readbyqxmd.com/read/29145527/evaluation-of-operating-time-and-patient-perception-using-conventional-impression-taking-and-intraoral-scanning-for-crown-manufacture-a-split-mouth-randomized-clinical-study
#4
Yasser Haddadi, Golnosh Bahrami, Flemming Isidor
PURPOSE: To compare operating time and patient perception of conventional impression (CI) taking and intraoral scanning (IOS) for manufacture of a tooth-supported crown. MATERIALS AND METHODS: A total of 19 patients needing indirect full-coverage restorations fitting the requirements for a split-mouth design were recruited. Each patient received two lithium disilicate crowns, one manufactured from CI taking and one from IOS. Both teeth were prepared following the manufacturers' recommendations...
November 16, 2017: International Journal of Prosthodontics
https://www.readbyqxmd.com/read/29141420/spectroscopic-characterization-of-the-complex-of-vinyl-radical-and-carbon-dioxide-matrix-isolation-and-ab-initio-study
#5
Sergey V Ryazantsev, Daniil A Tyurin, Vladimir I Feldman, Leonid Khriachtchev
We report on the preparation and vibrational characterization of the C2H3⋯CO2 complex, the first example of a stable intermolecular complex involving vinyl radicals. This complex was prepared in Ar and Kr matrices using UV photolysis of propiolic acid (HC3OOH) and subsequent thermal mobilization of H atoms. This preparation procedure provides vinyl radicals formed exclusively as a complex with CO2, without the presence of either CO2 or C2H3 monomers. The absorption bands corresponding to the ν5(C2H3), ν7(C2H3), ν8(C2H3), ν2(CO2), and ν3(CO2) modes of the C2H3⋯CO2 complex were detected experimentally...
November 14, 2017: Journal of Chemical Physics
https://www.readbyqxmd.com/read/29140872/an-experimental-investigation-of-implicit-hiv-and-prep-stigma-evidence-for-ancillary-benefits-of-prep-use
#6
Sarit A Golub, Corina Lelutiu-Weinberger, Anthony Surace
BACKGROUND: PrEP stigma (i.e., negative attitudes toward PrEP users) has been widely documented and is considered a significant barrier to implementation. However, few studies have examined PrEP stigma using implicit measures designed to reduce demand characteristics in responding. This study examined implicit PrEP- and HIV-related stigma among gay and bisexual men using geospatial social networking applications (i.e., "hookup apps"). METHODS: Participants were presented with four simulated online profiles (pre-tested for comparability) paired with each of the following characteristics: HIV-negative, HIV-positive, on PrEP, or Substance User...
November 13, 2017: Journal of Acquired Immune Deficiency Syndromes: JAIDS
https://www.readbyqxmd.com/read/29140704/direct-observation-of-splitting-in-oil-in-water-in-oil-emulsion-droplets-via-a-microchannel-mimicking-membrane-pores
#7
Kazuki Akamatsu, Koki Minezaki, Masumi Yamada, Minoru Seki, Shin-Ichi Nakao
Direct observation of double emulsion droplet permeation through a microchannel that mimicked 100-μm membrane pores with a porosity of 66.7% provided insights regarding splitting mechanisms in porous membranes. The microchannel was fabricated by standard soft lithography, and the oil-in-water-in-oil double emulsion droplets were prepared with a glass capillary device. By changing the flow rate from 0.5 to 5.0×10(-2) m s(-1), three characteristic behaviors were observed: (a) passage into one channel without splitting; (b) division into two smaller components; and (c) stripping of the middle water phase of the double emulsion droplets into a smaller double emulsion droplet and a smaller water-in-oil single emulsion droplet...
November 15, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/29140098/surface-roughness-of-methacrylate-and-silorane-based-composites-after-finishing-and-polishing-procedures
#8
M Jacinta Santos, Heleine Maria Chagas Rêgo, Leticia Linares, Amin S Rizkalla, Gildo C Santos
OBJECTIVE: To compare the effect of surface finishing and polishing protocols on the surface roughness (Ra) of methacrylate-based and silorane-based resin composites. METHODS AND MATERIALS: Fifty specimens (5 mm x 2 mm) of each composite material were prepared using a split mold: Filtek™ Supreme Ultra (3M ESPE), Tetric EvoCeram® (Ivoclar Vivadent), Tetric Ceram™ HB (Ivoclar Vivadent), and Filtek™ LS Low Shrink (3M ESPE). Specimens were divided into five groups (n = 10) according to the following procedures: G1 - 15-µm fine diamond bur (FDB); G2 - 15-µm FDB followed by a 20-fluted tungsten carbide bur; G3 - 15-µm FDB followed by diamond-impregnated micropolishing points (D-FINE Double Diamond Polishing System, Clinician's Choice); G4 - 15-µm FDB followed by diamond-impregnated micropolishing points (Flame Point Pre-polisher and Shine, Brassseler USA); and G5 - 15-µm FDB followed by the application of a surface sealer (PermaSeal®, Ultradent Products, Inc...
November 2017: Compendium of Continuing Education in Dentistry
https://www.readbyqxmd.com/read/29135926/proline-based-carbamates-as-cholinesterase-inhibitors
#9
Hana Pizova, Marketa Havelkova, Sarka Stepankova, Andrzej Bak, Tereza Kauerova, Violetta Kozik, Michal Oravec, Ales Imramovsky, Peter Kollar, Pavel Bobal, Josef Jampilek
Series of twenty-five benzyl (2S)-2-(arylcarbamoyl)pyrrolidine-1-carboxylates was prepared and completely characterized. All the compounds were tested for their in vitro ability to inhibit acetylcholinesterase (AChE) and butyrylcholinesterase (BChE), and the selectivity of compounds to individual cholinesterases was determined. Screening of the cytotoxicity of all the compounds was performed using a human monocytic leukaemia THP-1 cell line, and the compounds demonstrated insignificant toxicity. All the compounds showed rather moderate inhibitory effect against AChE; benzyl (2S)-2-[(2-chlorophenyl)carbamoyl]pyrrolidine-1-carboxylate (IC50 = 46...
November 14, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/29131634/general-oriented-synthesis-of-precise-carbon-confined-nanostructures-by-low-pressure-vapor-superassembly-and-controlled-pyrolysis
#10
Jiashen Meng, Xiong Liu, Jiantao Li, Qi Li, Chuan Zhao, Lin-Han Xu, Xuanpeng Wang, Fang Liu, Wei Yang, Xiaoming Xu, Ziang Liu, Chaojiang Niu, Liqiang Mai
Earth-abundant metal-based nanostructured materials have been widely studied for potential energy conversion and storage. However, controlled synthesis of functional nanostructures with high electron conductivity, high reaction activity and structural stability is still a formidable challenge for further practical applications. Herein, for the first time, we develop a facile, efficient and general method for the oriented synthesis of precise carbon-confined nanostructures by low-pressure vapor superassembly of a thin metal-organic framework (MOF) shell and subsequent controlled pyrolysis...
November 13, 2017: Nano Letters
https://www.readbyqxmd.com/read/29127794/novel-biochar-concrete-composites-manufacturing-characterization-and-evaluation-of-the-mechanical-properties
#11
Ali Akhtar, Ajit K Sarmah
In this study, biochar, a carbonaceous solid material produced from three different waste sources (poultry litter, rice husk and pulp and paper mill sludge) was utilized to replace cement content up to 1% of total volume and the effect of individual biochar mixed with cement on the mechanical properties of concrete was investigated through different characterization techniques. A total of 168 samples were prepared for mechanical testing of biochar added concrete composites. The results showed that pulp and paper mill sludge biochar at 0...
November 8, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/29120472/tuning-of-the-photocatalytic-performance-of-g-c3n4-by-polyoxometalates-under-visible-light
#12
Gang Yan, Xiaojia Feng, Liguang Xiao, Wenguang Xi, Huaqiao Tan, Hongfei Shi, Yonghui Wang, Yangguang Li
Carbon nitride (g-C3N4), as a rising star of metal-free photocatalysts, has received considerable attention. However, for practical application, the photocatalytic efficiency of g-C3N4 remains to be further improved. Herein, a series of Keggin-type polyoxoanion (polyoxoanions = SiW12O40(4-), PW12O40(3-), PMo12O40(3-)) modified g-C3N4 (POM/C3N4) composites have been successfully prepared. The results of XRD, TEM, XPS and EDAX reveal that a small amount of polyoxoanions was modified on the surface of g-C3N4 with electrostatic and hydrogen bonding interactions...
November 9, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/29119158/resonance-raman-and-ir-spectroscopy-of-aligned-carbon-nanotube-arrays-with-extremely-narrow-diameters-prepared-with-molecular-catalysts-on-steel-substrates
#13
Sagar Motilal Jain, Federico Cesano, Domenica Scarano, Tomas Edvinsson
Carbon nanotubes (CNTs) are considered promising for a large range of emerging technologies ranging from advanced electronics to utilization as nanoreactors. Here we report a controlled facile synthesis of aligned carbon nanotubes with very small dimensions directly grown on steel grid substrates via two-step catalytic chemical vapor deposition (CCVD) of a molecular catalyst (ferrocene) with ethylene as the carbon source. The system is characterized by resonance Raman spectroscopy and the results show single walled carbon nanotube (SWCNT) arrays composed of 0...
November 9, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/29116123/self-jumping-mechanism-of-melting-frost-on-superhydrophobic-surfaces
#14
Xiaolin Liu, Huawei Chen, Zehui Zhao, Yamei Wang, Hong Liu, Deyuan Zhang
Frost accretion on surfaces may cause severe problems and the high-efficiency defrosting methods are still urgently needed in many application fields like heat transfer, optical and electric power system, etc. In this study, a nano-needle superhydrophobic surface is prepared and the frosting/defrosting experiments are conducted on it. Three steps are found in the defrosting process: melting frost shrinking and splitting, instantaneous self-triggered deforming followed by deformation-induced movements (namely, in-situ shaking, rotating, rolling, and self-jumping)...
November 7, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29112048/results-of-a-community-based-randomized-study-comparing-a-clear-liquid-diet-with-a-low-residue-diet-using-a-magnesium-citrate-preparation-for-screening-and-surveillance-colonoscopies
#15
Chandrashekhar Thukral, Sumeet K Tewani, Adam J Lake, Aaron J Shiels, Kathy Geissler, Sara Popejoy, Megan Stafford, Joseph J Vicari
BACKGROUND: Current bowel preparations for colonoscopy include a clear liquid diet (CLD) along with consumption of a laxative. This dietary restriction along with large volume bowel preparations are barriers to compliance and willingness among patients in scheduling screening examinations. The aim of our study was to compare the efficacy and tolerability of a low-volume split dose magnesium citrate bowel preparation in patients on a low-residue diet (LRD) with those on a CLD. METHODS: In this single center, single blinded, randomized controlled trial, patients scheduled for outpatient colonoscopies were assigned to either a CLD or a LRD 1 day before the examination...
November 3, 2017: Journal of Clinical Gastroenterology
https://www.readbyqxmd.com/read/29111638/synergistic-activity-of-co-and-fe-in-amorphous-cox-fe-b-catalyst-for-efficient-oxygen-evolution-reaction
#16
Huayu Chen, Shuxin Ouyang, Ming Zhao, Yunxiang Li, Jinhua Ye
Water splitting has been greatly limited by the sluggish kinetics of the oxygen evolution reaction (OER). High-oxidation-state metal species are required as the favorable active sites in OER. Here, amorphous Cox-Fe-B (x is the molar ratio of Co/Fe), Co-B, and Fe-B compounds were successfully synthesized as the oxygen evolution electrocatalysts. The calculation of turnover frequency (TOF) indicates that both the Co and Fe sites are active for OER. Cyclic voltammetry, X-ray photoelectron spectroscopy, and long-term stability curves were used to demonstrate that Fe can stabilize Co in a higher oxidation level and meanwhile promote the generation of OOH-like species (the key intermediates for OER)...
November 13, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29106737/the-efficacy-of-supplementary-sonic-irrigation-using-the-endoactivator-%C3%A2-system-determined-by-removal-of-a-collagen-film-from-an-ex-vivo-model
#17
G Bryce, N MacBeth, K Gulabivala, Y-L Ng
AIM: To evaluate the efficacy of sonic irrigation (EndoActivator(®) ) using various polymer tips and power-settings in a stained collagen ex-vivo model. METHODOLOGY: Fifty human, straight single-rooted extracted teeth were prepared to size 40,.08 taper. The roots were split longitudinally; stained collagen applied to the canal surfaces, photographed and re-assembled. The canals were subjected to syringe without supplementary (Group 1, n = 10), or with supplementary sonic (groups 2-5, n = 10) irrigation...
November 6, 2017: International Endodontic Journal
https://www.readbyqxmd.com/read/29105631/phytoformulation-of-sassurea-lappa-plant-extract-a-single-blind-noninvasive-and-split-face-study-of-cream-on-various-skin-parameters
#18
Qazi Adnan, Naveed Akhtar, Barkat Ali Khan
Saussurea lappa (SL) has been reported for its antioxidant and anti-ageing properties. Due to this reason it can be incorporated in a stable phytoformulations for cosmetic use. The objective of the study was to evaluate the anti-aging potential of cosmetic o/w emulsion containing the botanical extract of SL. An emulsion (o/w) was prepared using TEGO® Care 450 (Polyglceryl-3-Methyl Glucose Distearate) emulsifier and final emulsion was loaded with 4 % extract of SL in aqueous phase. This emulsion evaluated for its antioxidant and anti-ageing properties on healthy human subjects using a non-invasive technique called surface evaluation of living skin (SELS)...
September 2017: Pakistan Journal of Pharmaceutical Sciences
https://www.readbyqxmd.com/read/29099571/layer-by-layer-assembly-of-polyoxometalates-for-photoelectrochemical-pec-water-splitting-toward-modular-pec-devices
#19
Dasom Jeon, Hyunwoo Kim, Cheolmin Lee, Yujin Han, Minsu Gu, Byeong-Su Kim, Jungki Ryu
Artificial photosynthesis is considered one of the most promising solutions to modern energy and environmental crises. Considering that it is enabled by multiple components through a series of photoelectrochemical processes, the key to successful development of a photosynthetic device depends not only on the development of novel individual components but also on the rational design of an integrated photosynthetic device assembled from them. However, most studies have been dedicated to the development of individual components due to the lack of a general and simple method for the construction of the integrated device...
November 13, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29098858/transition-metal-phosphide-carbon-nanosheet-composites-derived-from-two-dimensional-metal-organic-frameworks-for-highly-efficient-electrocatalytic-water-splitting
#20
Mengke Zhai, Fei Wang, Hongbin Du
The preparation of highly active, sustainable, nonprecious metal materials as hydrogen evolution and oxygen evolution reaction (HER and OER) catalysts that can relieve the environmental pollution and energy shortage problems present a great challenge to chemists. We herein report the fabrication of a highly active metal phosphide-carbon composite catalyst for HER and OER in acid and basic solution, respectively. The catalyst is derived through carbonization and subsequent phosphorization of two-dimensional (2D) cobalt porphyrinic metal-organic framework nanosheets...
November 13, 2017: ACS Applied Materials & Interfaces
keyword
keyword
77893
1
2
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"