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https://www.readbyqxmd.com/read/30412855/green-synthesis-of-manganese-nanoparticles-applications-and-future-perspective-a-review
#1
Vahid Hoseinpour, Nasser Ghaemi
Nanobiotechnology is a promising and appearing field of nanotechnology. In recent years, the necessity of making biocompatible materials for different applications in various area such as health, medicine, water treatment and purification, etc. caused more attention to this area. Today, green synthesis of different nanoparticles (NPs) has been extensively studied. However, less attention has been paid to manganese as a high-performance metal in various applications such as medicine, biomedicine, biosensors, water treatment and purification, electronics, electrochemistry, photoelectronics, catalysis, and etc...
October 31, 2018: Journal of Photochemistry and Photobiology. B, Biology
https://www.readbyqxmd.com/read/30412810/novel-synthesis-of-bi-bi-2-o-3-tio-2-c-composite-for-capturing-iodine-129-in-off-gas
#2
Hao Zou, Facheng Yi, Mianxin Song, Xiaoqiang Wang, Liang Bian, Weimin Li, Ning Pan, Xiaoqiang Jiang
The Bi-Bi2 O3 -TiO2 -C composites were prepared by a sol-gel method and investigated for capturing iodine-129 (129 I) in off-gas producing from spent fuel reprocessing. Firstly, the optimal process conditions were operated through the orthogonal experiments, showing that the capturing capacity of the optimal composite was calculated about 504.0 ± 19.5 mg/g, which is approximately 2.0-fold higher than that of the commercial silver-exchanged zeolites (AgX). Secondly, the structure and morphology of the Bi-Bi2 O3 -TiO2 -C composite were characterized, suggesting that the Bi is regularly spherical in the shape, coating by the Bi2 O3 , TiO2 and amorphous carbon...
November 2, 2018: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/30412505/non-phosphorylated-tau-in-cerebrospinal-fluid-is-a-marker-of-alzheimer-s-disease-continuum-in-young-urbanites-exposed-to-air-pollution
#3
Lilian Calderón-Garcidueñas, Partha S Mukherjee, Katharina Waniek, Max Holzer, Chih-Kai Chao, Charles Thompson, Rubén Ruiz-Ramos, Ana Calderón-Garcidueñas, Maricela Franco-Lira, Rafael Reynoso-Robles, Angélica Gónzalez-Maciel, Ingolf Lachmann
Long-term exposure to fine particulate matter (PM2.5) and ozone (O3) above USEPA standards is associated with Alzheimer's disease (AD) risk. Metropolitan Mexico City (MMC) children exhibit subcortical pretangles in infancy and cortical tau pre-tangles, NFTs, and amyloid phases 1-2 by the 2nd decade. Given their AD continuum, we measured in 507 normal cerebrospinal fluid (CSF) samples (MMC 354, controls 153, 12.82±6.73 y), a high affinity monoclonal non-phosphorylated tau antibody (non-P-Tau), as a potential biomarker of AD and axonal damage...
November 8, 2018: Journal of Alzheimer's Disease: JAD
https://www.readbyqxmd.com/read/30412037/efficacy-of-paired-electrochemical-sensors-for-measuring-ozone-concentrations
#4
Christopher Zuidema, Nima Afshar-Mohajer, Marcus Tatum, Geb Thomas, Thomas Peters, Kirsten Koehler
Typical low-cost electrochemical sensors for ozone (O3 ) are also highly responsive to nitrogen dioxide (NO2 ). Consequently, a single sensor's response to O3 is indistinguishable from its response to NO2 . Recently, a method for quantifying O3 concentrations became commercially available (Alphasense Ltd., Essex, UK): collocating a pair of sensors, a typical oxidative gas sensor that responds to both O3 and NO2 (model OX-B431) and a second similar sensor that filters O3 and responds only to NO2 (model NO2-B43F)...
November 9, 2018: Journal of Occupational and Environmental Hygiene
https://www.readbyqxmd.com/read/30411606/effects-of-environmental-water-absorption-by-solution-deposited-al-2-o-3-gate-dielectrics-on-thin-film-transistor-performance-and-mobility
#5
Trey B Daunis, James M H Tran, Julia W P Hsu
In recent years many solution-processed oxide transistors have been reported with mobility rivaling or exceeding their vacuum-deposited counterparts. Here we show that water absorption from the environment by solution-processed dielectric materials explains this enhanced mobility. By monitoring the water content of Al2 O3 , ZrO2 , and bilayer dielectric materials, we demonstrate how water absorption by the dielectric affects electrical characteristics in solution-processed metal oxide transistors. These effects, including capacitance-frequency dispersion, counter-clockwise hysteresis in transfer curves, and high channel mobility, are elucidated by electron transfer between the gate/channel and trap states within the band gap of the dielectric created by the water...
November 9, 2018: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/30409721/effect-of-different-times-of-nonthermal-argon-plasma-treatment-on-the-microtensile-bond-strength-of-self-adhesive-resin-cement-to-yttria-stabilized-tetragonal-zirconia-polycrystal-ceramic
#6
Alexandre Barboza Elias, Renata Antoun Simão, Maíra Prado, Paulo Francisco Cesar, Glauco Botelho Dos Santos, Eduardo Moreira da Silva
STATEMENT OF PROBLEM: Nonthermal argon plasma may increase the surface energy of yttria-stabilized tetragonal zirconia polycrystal (Y-TZP) dental ceramics. However, studies that evaluated the effect of increased plasma treatment times on the bond strength of resin cements to Y-TZP ceramics are lacking. PURPOSE: The purpose of this in vitro study was to evaluate the effect of different nonthermal argon plasma (NTAP) treatment times on the surface energy and bond strength of a self-adhesive resin cement to Y-TZP ceramic...
November 5, 2018: Journal of Prosthetic Dentistry
https://www.readbyqxmd.com/read/30408867/interaction-between-al-2-o-3-and-different-sizes-of-go-in-aqueous-environment
#7
Xia Liu, Xuetao Xu, Ju Sun, Shengxia Duan, Yubing Sun, Tasawar Hayat, Jiaxing Li
Although the aggregation of graphene oxide (GO) has been widely researched, the influence of the GO size on the homoaggregation behavior and its interaction with environmental media are still unexplored. In this work, critical coagulation concentration (CCC) values for GO with different sizes, from micro to nanosheet, were measured with NaCl and CaCl2 electrolytes, and the results indicated that GO with the largest size presented the smallest CCC value. Aluminum oxide (Al2 O3 ) was selected as a natural solid particle representative to mimic the interaction between GO and environmental media...
December 2018: Environmental Pollution
https://www.readbyqxmd.com/read/30408735/performance-comparison-of-hematite-%C3%AE-fe-2-o-3-polymer-composite-and-core-shell-nanofibers-as-point-of-use-filtration-platforms-for-metal-sequestration
#8
Katherine E Greenstein, Nosang V Myung, Gene F Parkin, David M Cwiertny
Point-of-use water treatment technologies can help mitigate risks from drinking water contamination, particularly for metals (and metalloids) that originate in distribution systems (e.g., chromium, lead, copper) or are naturally occurring in private groundwater wells (e.g., arsenic). Here, composite nanofibers of polyacrylonitrile (PAN) with embedded hematite (α-Fe2 O3 ) nanoparticles were synthesized via a single-pot electrospinning synthesis. A core-shell nanofiber composite was also prepared through the subsequent hydrothermal growth of α-Fe2 O3 nanostructures on embedded hematite composites...
October 28, 2018: Water Research
https://www.readbyqxmd.com/read/30408302/isovalent-cation-ordering-in-the-polar-rhombohedral-perovskite-bi-2-fealo-6
#9
Chandan De, Ángel M Arévalo-López, Fabio Orlandi, Pascal Manuel, J Paul Attfield, Athinarayanan Sundaresan
Ordering of cations in different structural types occurs when there is a significant difference in the oxidation states and ionic radii of the ions involved. Herein we report an unusual ordering of isovalent cations Fe3+ and Al3+ in the polar rhombohedral R3 double perovskite structure of Bi2 FeAlO6 synthesized at high-pressure (6 GPa) and high-temperature (1000 °C). This ordered structure is derived from the 1:1 combination of the polar oxides BiFeO3 (R3c) and BiAlO3 (R3c), which results in reduction of symmetry to an R3 structure where the Fe3+ and Al3+ ions are ordered in a rock salt manner...
November 8, 2018: Angewandte Chemie
https://www.readbyqxmd.com/read/30407794/insights-into-the-plasma-assisted-fabrication-and-nanoscopic-investigation-of-tailored-mno-2-nanomaterials
#10
Davide Barreca, Filippo Gri, Alberto Gasparotto, Thomas Altantzis, Valentina Gombac, Paolo Fornasiero, Chiara Maccato
Among transition metal oxides, MnO2 is of considerable importance for various technological end-uses, from heterogeneous catalysis to gas sensing, owing to its structural flexibility and unique properties at the nanoscale. In this work, we demonstrate the successful fabrication of supported MnO2 nanomaterials by a catalyst-free, plasma-assisted process starting from a fluorinated manganese(II) molecular source in Ar/O2 plasmas. A thorough multitechnique characterization aimed at the systematic investigation of material structure, chemical composition, and morphology revealed the formation of F-doped, oxygen-deficient, MnO2 -based nanomaterials, with a fluorine content tunable as a function of growth temperature ( TG )...
November 8, 2018: Inorganic Chemistry
https://www.readbyqxmd.com/read/30406249/atmospheric-chemistry-of-iodine-anions-elementary-reactions-of-i-io-and-io-2-with-ozone-studied-in-the-gas-phase-at-300-k-using-an-ion-trap
#11
Ricky Teiwes, Jonas Elm, Karsten Handrup, Ellen P Jensen, Merete Bilde, Henrik B Pedersen
Using a radio-frequency ion trap to study ion-molecule reactions under isolated conditions, we report a direct experimental determination of reaction rate constants for the sequential oxidation of iodine anions by ozone at room temperature (300 K). The results are R1: I- + O3 → IO- + O2, k1 = (7 ± 2) × 10-12 cm3 s-1; R2: IO- + O3 → IO2- + O2, k2 = (10 ± 2) × 10-9 cm3 s-1; R3: IO2- + O3 → IO3- + O2, k3 = (16 ± 2) × 10-9 cm3 s-1. More oxidized forms such as IO4- and IO5- were not observed. Additionally, we performed quantum chemical calculations to elucidate the energetics of these oxidation reactions...
November 8, 2018: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/30406082/carbothermal-synthesis-of-nitrogen-doped-graphene-composites-for-energy-conversion-and-storage-devices
#12
Hongwei Mi, Xiaodan Yang, Jun Hu, Qianling Zhang, Jianhong Liu
Metal oxides and carbonaceous composites are both promising materials for electrochemical energy conversion and storage devices, such as secondary rechargeable batteries, fuel cells and electrochemical capacitors. In this study, Fe3 O4 nanoparticles wrapped in nitrogen-doped (N-doped) graphene nanosheets (Fe3 O4 @G) were fabricated by a facile one-step carbothermal reduction method derived from Fe2 O3 and liquid-polyacrylonitrile (LPAN). The unique two-dimensional structure of N-doped graphene nanosheets, can not only accommodate the volume changes during lithium intercalation/extraction processes and suppress the particles aggregation but also act as an electronically conductive matrix to improve the electrochemical performance of Fe3 O4 anode, especially the rate capability...
2018: Frontiers in Chemistry
https://www.readbyqxmd.com/read/30406076/control-of-uniaxial-negative-thermal-expansion-in-layered-perovskites-by-tuning-layer-thickness
#13
Chris Ablitt, Arash A Mostofi, Nicholas C Bristowe, Mark S Senn
Uniaxial negative thermal expansion (NTE) is known to occur in low n members of the A n +1 B n O3 n +1 Ruddlesden-Popper (RP) layered perovskite series with a frozen rotation of BO6 octahedra about the layering axis. Previous work has shown that this NTE arises due to the combined effects of a close proximity to a transition to a competing phase, so called "symmetry trapping", and highly anisotropic elastic compliance specific to the symmetry of the NTE phase. We extend this analysis to the broader RP family ( n = 1, 2, 3, 4, …, ∞), demonstrating that by changing the fraction of layer interface in the structure (i...
2018: Frontiers in Chemistry
https://www.readbyqxmd.com/read/30403481/crystal-and-magnetic-structures-and-properties-of-lu-1-x-mn-x-mno-3-solid-solutions
#14
Lei Zhang, Andreas Dönni, Vladimir Y Pomjakushin, Kazunari Yamaura, Alexei A Belik
(Lu1- x Mn x )MnO3 solid solutions, having the perovskite-type structure and Pnma space group, with 0 ≤ x ≤ 0.4 were synthesized by a high-pressure, high-temperature method at 6 GPa and about 1670 K from Lu2 O3 and Mn2 O3 . Their crystal and magnetic structures were studied by neutron powder diffraction. The degree of octahedral MnO6 tilting decreases in (Lu1- x Mn x )MnO3 with increasing x. Only the incommensurate (IC) spin structure with a propagation vector of k = ( k0 , 0, 0) and k0 ≈ 0.44 remains in (Lu0...
November 7, 2018: Inorganic Chemistry
https://www.readbyqxmd.com/read/30402782/ozone-induction-coupled-with-plasma-assistance-to-enhance-cataluminescence-for-monitoring-of-volatile-organic-compounds
#15
Wanting Huang, Yufei Hu, Zhenyu Lu, Yanhui Zhong, Runkun Zhang, Gongke Li
The authors describe a strategy for ozone-induction coupling with plasma assistance (O3 -I/PA) to enhance cataluminescence (CTL) based sensing of volatile organic compounds (VOCs). A homemade O3 -I/PA CTL sensor system was constructed based on this strategy. O3 -I/PA can significantly enhance the CTL response to many compounds that were hardly detectable previously with adequate sensitivity. Without any preconcentration, the limits of detection (for S/N = 3) are 20 μg.m-3 (= 5 ppbv) for toluene and 8 μg...
November 6, 2018: Mikrochimica Acta
https://www.readbyqxmd.com/read/30399561/oxidative-stress-mediated-cytotoxicity-and-apoptosis-response-of-bismuth-oxide-bi-2-o-3-nanoparticles-in-human-breast-cancer-mcf-7-cells
#16
Maqusood Ahamed, Mohd Javed Akhtar, M A Majeed Khan, Salman A Alrokayan, Hisham A Alhadlaq
Bismuth oxide nanoparticles (Bi2 O3 NPs) have shown great potential for several applications including cosmetics and biomedicine. However, there is paucity of research on toxicity of Bi2 O3 NPs. In this study, we first examined dose-dependent cytotoxicity and apoptosis response of Bi2 O3 NPs in human breast cancer (MCF-7) cells. We further explored the potential mechanisms of cytotoxicity of Bi2 O3 NPs through oxidative stress. Physicochemical study demonstrated that Bi2 O3 NPs have crystalline structure and spherical shape with mean size of 97 nm...
October 31, 2018: Chemosphere
https://www.readbyqxmd.com/read/30399483/ozone-and-cardiac-arrest-the-role-of-previous-hospitalizations
#17
Auriba Raza, Marcus Dahlquist, Martin Jonsson, Jacob Hollenberg, Leif Svensson, Tomas Lind, Petter L S Ljungman
BACKGROUND: Several studies have reported associations between exposure to particulate matter and incidence of out-of-hospital cardiac arrest (OHCA) and some have observed associations with ozone (O3 ). There are no studies investigating susceptibility based on previous disease history to short-term O3 exposure and the risk of OHCA. AIM: To investigate the role of previous cardiovascular-related hospitalizations in modifying the associations between the risk of OHCA and short-term increase in O3 concentrations...
October 27, 2018: Environmental Pollution
https://www.readbyqxmd.com/read/30398854/solid-phase-epitaxial-growth-of-an-alumina-layer-having-a-stacking-mismatched-domain-structure-of-the-intermediate-%C3%AE-phase
#18
Jeonghwan Jang, Seung-Yong Lee, Hwanyeol Park, Sangmoon Yoon, Gyeong-Su Park, Gun-Do Lee, Yongjo Park, Miyoung Kim, Euijoon Yoon
Solid-phase epitaxy (SPE), a solid-state phase transition of materials from an amorphous to a crystalline phase, is a convenient crystal growing technique. In particular, SPE can be used to grow α-Al2 O3 epitaxially with a novel structure that provides an effective substrate for improved performance of light-emitting diodes (LEDs). However, the inevitable two-step phase transformation through the γ-Al2 O3 phase hinders the expected improved crystallinity of α-Al2 O3 , and thereby further enhancement of LED performance...
November 6, 2018: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/30398213/comparison-of-the-crystal-structures-and-hirshfeld-surface-analysis-of-five-n-4-methylbenzenesulfonyl-glycine-hydrazone-derivatives
#19
H Purandara, Sabine Foro, B Thimme Gowda
The crystal structures of N-(4-methylbenzenesulfonyl)glycine hydrazone and four derivatives with four different substituents have been investigated, namely, (E)-N-{2-[2-(benzylidene)hydrazinyl]-2-oxoethyl}-4-methylbenzenesulfonamide, C16 H17 N3 O3 S, (I), (E)-N-{2-[2-(4-bromobenzylidene)hydrazinyl]-2-oxoethyl}-4-methylbenzenesulfonamide, C16 H16 BrN3 O3 S, (II), (E)-N-{2-[2-(4-chlorobenzylidene)hydrazinyl]-2-oxoethyl}-4-methylbenzenesulfonamide, C16 H16 ClN3 O3 S, (III), (E)-N-(2-{2-[4-(dimethylamino)benzylidene]hydrazinyl}-2-oxoethyl)-4-methylbenzenesulfonamide, C18 H22 N4 O3 S, (IV), and (E)-N-{2-[2-(4-methoxybenzylidene)hydrazinyl]-2-oxoethyl}-4-methylbenzenesulfonamide, C17 H19 N3 O4 S, (V)...
November 1, 2018: Acta Crystallographica. Section C, Structural Chemistry
https://www.readbyqxmd.com/read/30398204/multifunctional-arylsulfonamide-derivatives-with-5-ht-6-5-ht-7-receptor-antagonistic-activity-a-structural-study
#20
Justyna Kalinowska-Tłuścik, Agata Piaskowska, Marcin Kołaczkowski
Nowadays, a search for antagonists co-acting on serotonin receptor subtypes 6 and 7 (5-HT6 R and 5-HT7 R, respectively) is of great interest due to the increasing number of patients suffering from dementia and related behavioural and psychological symptoms. The X-ray crystal structures of four promising multifunctional ligands in the hydrochloride forms were determined, namely 4-(6-fluoro-1,2-benzoxazol-3-yl)-1-[3-(3-methylbenzenesulfonamido)propyl]piperidin-1-ium chloride, C22 H27 FN3 O3 S+ ·Cl- , (I), 4-(6-fluoro-1,2-benzoxazol-3-yl)-1-[4-(5-fluoro-3-methylbenzo[b]thiophene-2-sulfonamido)butyl]piperidin-1-ium chloride, C25 H28 F2 N3 O3 S2 + ·Cl- , (II), 4-(6-fluoro-1,2-benzoxazol-3-yl)-1-[4-(6-fluorobenzo[b]thiophene-2-sulfonamido)butyl]piperidin-1-ium chloride, C24 H26 ClFN3 O3 S2 + ·Cl- , (III), and 4-(6-fluoro-1,2-benzoxazol-3-yl)-1-[3-(3-chloro-4-fluorobenzenesulfonamido)propyl]piperidin-1-ium chloride, C21 H22 ClF2 N3 O3 S2 + ·Cl- , (IV)...
November 1, 2018: Acta Crystallographica. Section C, Structural Chemistry
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