keyword
MENU ▼
Read by QxMD icon Read
search

phosphore

keyword
https://www.readbyqxmd.com/read/28340524/controlled-hydrothermal-synthesis-and-photoluminescence-of-nanocrystalline-znga2o4-cr-3-monospheres
#1
Tian Luan, Jinhan Liu, Xiaoxue Yuan, Ji-Guang Li
The hydrothermal synthesis of nanocrystalline ZnGa2O4:Cr(3+) (ZGC) red phosphor monospheres was accomplished in this work, and the effects of system pH, reactant content, reaction time, and citrate anions (Cit(3-)) on the phase and morphology evolution of the product were systematically studied. Under the optimized conditions of Cit(3-)/M = 1.0 molar ratio (M = total cations), pH = 5.0, and 0.2 mmol of Zn(2+), well-dispersed ZGC monospheres with an average diameter of ~454 ± 56 nm (average crystallite size ~15 nm) were successfully obtained via hydrothermal reaction at 180 °C for 18 h...
December 2017: Nanoscale Research Letters
https://www.readbyqxmd.com/read/28339188/preparation-and-characterization-of-parent-phenylphosphinidene-and-its-oxidation-to-phenyldioxophosphorane-the-elusive-phospho-rous-analogue-of-nitrobenzene
#2
Artur Mardyukov, Dominik Niedek, Peter R Schreiner
Triplet phenylphosphinidene was prepared by light-induced elimination of ethylene from the corresponding phenylphosphirane and was characterized by IR and UV/Vis spectroscopy together with matching of its spectral data with density functional theory (DFT) computations. The photolysis of phenylphosphirane in 3P-O2 doped matrices enabled the spectroscopic identification of a hitherto unknown phenyldioxophosphorane, the long elusive phosphorous analogue of nitrobenzene.
March 24, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28335322/black-phosphorus-critical-review-and-potential-for-water-splitting-photocatalyst
#3
REVIEW
Tae Hyung Lee, Soo Young Kim, Ho Won Jang
A century after its first synthesis in 1914, black phosphorus has been attracting significant attention as a promising two-dimensional material in recent years due to its unique properties. Nowadays, with the development of its exfoliation method, there are extensive applications of black phosphorus in transistors, batteries and optoelectronics. Though, because of its hardship in mass production and stability problems, the potential of the black phosphorus in various fields is left unexplored. Here, we provide a comprehensive review of crystal structure, electronic, optical properties and synthesis of black phosphorus...
October 29, 2016: Nanomaterials
https://www.readbyqxmd.com/read/28335321/two-dimensional-semiconductor-optoelectronics-based-on-van-der-waals-heterostructures
#4
REVIEW
Jae Yoon Lee, Jun-Hwan Shin, Gwan-Hyoung Lee, Chul-Ho Lee
Two-dimensional (2D) semiconductors such as transition metal dichalcogenides (TMDCs) and black phosphorous have drawn tremendous attention as an emerging optical material due to their unique and remarkable optical properties. In addition, the ability to create the atomically-controlled van der Waals (vdW) heterostructures enables realizing novel optoelectronic devices that are distinct from conventional bulk counterparts. In this short review, we first present the atomic and electronic structures of 2D semiconducting TMDCs and their exceptional optical properties, and further discuss the fabrication and distinctive features of vdW heterostructures assembled from different kinds of 2D materials with various physical properties...
October 27, 2016: Nanomaterials
https://www.readbyqxmd.com/read/28335187/nickel-decorated-on-phosphorous-doped-carbon-nitride-as-an-efficient-photocatalyst-for-reduction-of-nitrobenzenes
#5
Anurag Kumar, Pawan Kumar, Chetan Joshi, Manvi Manchanda, Rabah Boukherroub, Suman L Jain
Nickel nanoparticle-decorated phosphorous-doped graphitic carbon nitride (Ni@g-PC₃N₄) was synthesized and used as an efficient photoactive catalyst for the reduction of various nitrobenzenes under visible light irradiation. Hydrazine monohydrate was used as the source of protons and electrons for the intended reaction. The developed photocatalyst was found to be highly active and afforded excellent product yields under mild experimental conditions. In addition, the photocatalyst could easily be recovered and reused for several runs without any detectable leaching during the reaction...
April 1, 2016: Nanomaterials
https://www.readbyqxmd.com/read/28334920/spe-hplc-determination-of-chlorogenic-and-phenolic-acids-in-coffee
#6
Pelin Köseoglu Yilmaz, Ufuk Kolak
A new solid phase extraction-high-performance liquid chromatography method with ultraviolet detection was developed and validated for the determination of three chlorogenic acids (5-O-caffeoylquinic, 3-O-caffeoylquinic and 4-O-caffeoylquinic acids) and six phenolic acids (caffeic, ferulic, sinapic, protocatechuic, p-hydroxybenzoic acid (PHBA) and vanillic acid (VA)) in coffee bean samples. Extraction was performed using hydrophilic-lipophilic balance cartridges. Separations were accomplished using a C18 guard column (10 × 2...
March 18, 2017: Journal of Chromatographic Science
https://www.readbyqxmd.com/read/28334489/ce-iv-gd-iii-mixed-oxides-as-hosts-for-er-iii-based-upconversion-phosphors
#7
Cecilia Sorbello, Petra Gross, Cristian A Strassert, Matías Jobbágy, Beatriz C Barja
A family of Er(III) and Er(III) -Yb(III) based nanophosphors, hosted in monophasic oxidic Ce(IV) -Gd(III) binary solid solutions, was prepared. The samples were formulated with a constant Er(III) content as the activator, with the eventual addition of Yb(III) as a sensitizer. The amorphous Ce0.94-x Gdx Er0.06 (OH)CO3 ⋅H2 O and Ce0.94-x Gdx Er0.05 Yb0.01 (OH)CO3 ⋅H2 O precursors were prepared by following the urea method to obtain monodispersed spheres of tunable size ranging from 30 to 450 nm. After being decomposed at 1273 K under an atmosphere of air, the precursors of 200 nm in diameter evolved into monophasic polycrystalline particles preserving the parent shape and size...
March 23, 2017: Chemphyschem: a European Journal of Chemical Physics and Physical Chemistry
https://www.readbyqxmd.com/read/28332819/a-path-to-impact-for-autonomous-field-deployable-chemical-sensors-a-case-study-of-in-situ-nitrite-sensors
#8
Tim M Schierenbeck, Matthew C Smith
Natural freshwater systems have been severely affected by excess loading of macronutrients (e.g., nitrogen and phosphorous) from fertilizers, fossil fuels, and human and livestock waste. In the USA, impacts to drinking water quality, biogeochemical cycles, and aquatic ecosystems are estimated to cost US$210 billion annually. Field-deployable nutrient sensors (FDS) offer potential to support research and resource management efforts by acquiring higher resolution data than are currently supported by expensive conventional sampling methods...
March 23, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28332764/catalytic-asymmetric-n-alkylation-of-indoles-and-carbazoles-through-1-6-conjugate-addition-of-aza-para-quinone-methides
#9
Min Chen, Jianwei Sun
Catalytic asymmetric N-alkylation of indoles and carbazoles represents a family of important but underdeveloped reactions. Herein, we describe a new organocatalytic strategy in which in situ generated aza-para-quinone methides are employed as the alkylating reagent. With the proper choice of a chiral phosphoric acid and an N-protective group, the intermolecular C-N bond formation with various indole and carbazole nucleophiles proceeded efficiently under mild conditions with excellent enantioselectivity and functional-group compatibility...
March 23, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28332576/catalytic-asymmetric-radical-aminoperfluoroalkylation-and-aminodifluoromethylation-of-alkenes-to-versatile-enantioenriched-fluoroalkyl-amines
#10
Jin-Shun Lin, Fu-Li Wang, Xiao-Yang Dong, Wei-Wei He, Yue Yuan, Su Chen, Xin-Yuan Liu
Although great success has been achieved in asymmetric fluoroalkylation reactions via nucleophilic or electrophilic processes, the development of asymmetric radical versions of this type of reactions remains a formidable challenge because of the involvement of highly reactive radical species. Here we report a catalytic asymmetric radical aminoperfluoroalkylation and aminodifluoromethylation of alkenes with commercially available fluoroalkylsulfonyl chlorides as the radical sources, providing a versatile platform to access four types of enantioenriched α-tertiary pyrrolidines bearing β-perfluorobutanyl, trifluoromethyl, difluoroacetyl and even difluoromethyl groups in excellent yields and with excellent enantioselectivity...
March 23, 2017: Nature Communications
https://www.readbyqxmd.com/read/28332469/marrying-step-feed-with-clarifier-improvements-increase-wet-weather-capacity-integrated-methodology
#11
Glen T Daigger John S Siczka Thomas F Smith David A Frank J A McCorquodale
The need to increase the peak wet weather secondary treatment capacity of the City of Akron, OH, Water Reclamation Facility (WRF) provided the opportunity to test an integrated methodology for maximizing the peak wet weather secondary treatment capacity of activated sludge systems. An initial investigation, consisting of process modeling of the secondary treatment system and computational fluid dynamics (CFD) analysis of the existing relatively shallow secondary clarifiers (3.3 and 3.7 m sidewater depth in 30...
March 22, 2017: Water Environment Research: a Research Publication of the Water Environment Federation
https://www.readbyqxmd.com/read/28331946/-technique-of-proton-and-phosphorous-mr-spectroscopy
#12
M Backens
CLINICAL/METHODICAL ISSUE: Magnetic resonance spectroscopy (MRS) is an important non-invasive method that can reveal the concentration and spatial distribution of particular biochemically relevant tissue metabolites. STANDARD RADIOLOGICAL METHODS: Proton MRS is routinely applicable in the clinical setting providing good quality results even with a moderate magnetic field strength of 1.5 T. Relative values of metabolite concentrations are mostly used for the assessment of metabolic disorders...
March 22, 2017: Der Radiologe
https://www.readbyqxmd.com/read/28330526/different-spectrophotometric-and-chromatographic-methods-for-determination-of-mepivacaine-and-its-toxic-impurity
#13
Nada S Abdelwahab, Nehal F Fared, Mohamed Elagawany, Esraa H Abdelmomen
Stability-indicating spectrophotometric, TLC-densitometric, and ultra-performance LC (UPLC) methods were developed forthe determination of mepivacaine HCl (MEP) in the presence of its toxic impurity, 2,6-dimethylanaline (DMA). Different spectrophotometric methods were developed for the determination of MEP and DMA. In a dual-wavelength method combined with direct spectrophotometric measurement, the absorbance difference between 221.4 and 240 nm was used for MEP measurements, whereas the absorbance at 283 nm was used for measuring DMA in the binary mixture...
February 21, 2017: Journal of AOAC International
https://www.readbyqxmd.com/read/28330260/impact-of-forest-vegetation-on-soil-characteristics-a-correlation-between-soil-biological-and-physico-chemical-properties
#14
L R Chandra, S Gupta, V Pande, N Singh
Temperate and dry deciduous forest covers major portion of terrestrial ecosystem in India. The two forest types with different dominant tree species differ in litter quality and root exudates, thereby exerting species-specific impact on soil properties and microbial activity. This study aims to examine the influence of forest type or dominant tree species on soil physico-chemical properties and its relationship with microbial characters in temperate and dry deciduous forest types. We assessed soil physico-chemical properties among five different sites located within the selected forest stand covered by different dominant species...
December 2016: 3 Biotech
https://www.readbyqxmd.com/read/28328540/er-3-tm-3-yb-3-camoo4-phosphor-as-an-outstanding-upconversion-based-optical-temperature-sensor-and-optical-heater
#15
Riya Dey, Vineet Kumar Rai
Optical temperature sensing in Er(3+)-Tm(3+)-Yb(3+)codoped CaMoO4 phosphor prepared by chemical co-precipitation route based on the near infrared (NIR) to green upconversion emission from Er(3+) ion is reported. The variation with respect to external temperature in emission intensity ratio of the green emissions around 530 nm and 552 nm, corresponding to the (2)H11/2 → (4)I15/2 and (4)S3/2 → (4)I15/2 transitions respectively, under 980 nm excitation has been studied in detail, to report the sensing property of the prepared material; the maximum sensor sensitivity ∼0...
March 22, 2017: Methods and Applications in Fluorescence
https://www.readbyqxmd.com/read/28326759/a-practical-cryogen-free-co2-purification-and-freezing-technique-for-stable-isotope-analysis
#16
Saburo Sakai, Shinichi Matsuda
 Since isotopic analysis by mass spectrometer began in the early 1900s, sample gas for light-element isotopic measurement has been purified by the use of cryogens and vacuum-line systems. However, this conventional purification technique can achieve only certain temperatures, which depend on the cryogens, and can be sustained only as long as there is a continuous cryogen supply. Here, we demonstrate a practical cryogen-free CO2 purification technique using an electrical operated cryocooler for stable isotope analysis...
March 22, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28325708/use-of-glucose-as-reductant-to-recover-co-from-spent-lithium-ions-batteries
#17
Qi Meng, Yingjie Zhang, Peng Dong
A hydrometallurgical leaching process has been developed for recovery of Co and Li from cathode material (LiCoO2) collected from spent LIBs using a mix solution of glucose and phosphoric acid. The spent LiCoO2 before and after leaching process are analyzed by scanning electron microscopy. A leaching rate of about 98% Co and nearly 100% Li is presented with 1.5mol/L phosphoric acid and 0.02mol/L glucose at 80°C in about 2h. During leaching process, glucose was oxidized into monocarboxylic acid with reduction of Co(III) to Co(II)...
March 18, 2017: Waste Management
https://www.readbyqxmd.com/read/28325595/plant-soaking-decomposition-as-well-as-nitrogen-and-phosphorous-release-in-the-water-level-fluctuation-zone-of-the-three-gorges-reservoir
#18
Liwe Xiao, Bo Zhu, Mathieu Nsenga Kumwimba, Shiwei Jiang
The operating scheme of the Three Gorges Reservoir results in a summer drought in the water-level fluctuation zone during which plants grow vigorously. In the winter inundation season, soaking plants may decompose and release nutrients resulting in water quality deterioration. This study quantifies the contributions of the underwater decomposition of nine dominant plant species in the water-level fluctuation zone to nutrient release. The in-situ litterbag technique was used to study for soaking decomposition over 200days...
March 18, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28323898/perfluorocarbon-reduces-cell-damage-from-blast-injury-by-inhibiting-signal-paths-of-nf-%C3%AE%C2%BAb-mapk-and-bcl-2-bax-signaling-pathway-in-a549-cells
#19
Zhaorui Zhang, Zhixin Liang, Huaidong Li, Chunsun Li, Zhen Yang, Yanqin Li, Danyang She, Lu Cao, Wenjie Wang, Changlin Liu, Liangan Chen
BACKGROUND AND OBJECTIVE: Blast lung injury is a common type of blast injury and has very high mortality. Therefore, research to identify medical therapies for blast injury is important. Perfluorocarbon (PFC) is used to improve gas exchange in diseased lungs and has anti-inflammatory functions in vitro and in vivo. The aim of this study was to determine whether PFC reduces damage to A549 cells caused by blast injury and to elucidate its possible mechanisms of action. STUDY DESIGN AND METHODS: A549 alveolar epithelial cells exposed to blast waves were treated with and without PFC...
2017: PloS One
https://www.readbyqxmd.com/read/28322381/first-principles-and-experimental-characterization-of-the-electronic-properties-of-cagasin3-and-caalsin3-the-impact-of-chemical-disorder
#20
Robin Niklaus, Ján Minár, Jonas Häusler, Wolfgang Schnick
We report a detailed investigation of the electronic, mechanical and optical properties of the recently discovered nitridogallosilicate CaGaSiN3 which has potential as a LED-phosphor host material. We focus on chemical disorder effects, originating from the Ga/Si site, and compared them to those of isostructural CaAlSiN3. We calculate the elastic moduli and the Debye temperature in terms of quasi harmonical approximation. Spectral properties like the joint density of states (JDOS) are evaluated and the absorption, reflectance and energy loss function are obtained from the dielectric function...
March 21, 2017: Physical Chemistry Chemical Physics: PCCP
keyword
keyword
58808
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"