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https://www.readbyqxmd.com/read/28214103/tracking-the-evolution-and-differences-between-guest-induced-phases-of-ga-mil-53-via-ultra-wideline-69-71-ga-solid-state-nmr-spectroscopy
#1
Yue Zhang, Bryan E G Lucier, Victor V Terskikh, Renlong Zheng, Yining Huang
Ga-MIL-53 is a metal-organic framework (MOF) that exhibits a "breathing effect," in which the pore size and overall MOF topology can be influenced by temperature, pressure, and host-guest interactions. The phase control afforded by this flexible framework renders Ga-MIL-53 a promising material for guest storage and sensing applications. In this work, the structure and behavior of four Ga-MIL-53 phases (as, ht, enp and lt), along with CO2 adsorbed within Ga-MIL-53 at various loading levels, has been investigated using (69/71)Ga solid-state NMR (SSNMR) experiments at 21...
January 31, 2017: Solid State Nuclear Magnetic Resonance
https://www.readbyqxmd.com/read/28213284/synthesis-of-hetero-annulated-isoxazolo-pyrido-and-pyrimido-carbazoles-screened-for-in%C3%A2-vitro-antitumor-activity-and-structure-activity-relationships-a-novel-2-amino-4-3-bromo-4-methoxyphenyl-8-chloro-11h-pyrimido-4-5-a-carbazole-as-an-antitumor-agent
#2
Karunanidhi Murali, Hazel A Sparkes, Karnam Jayarampillai Rajendra Prasad
Claisen-Schmidt condensation of 2,3,4,9-tetrahydro-1H-carbazol-1-one with 3-bromo-4-methoxy benzaldehyde afforded the 2-(3'-bromo-4'-methoxybenzylidene)-2,3,4,9-tetrahydro-1H-carbazol-1-one 3. Compound 3 was allowed to react with different organic reactants, hydroxylamine hydrochloride, malononitrile and guanidine nitrate through condensation cum cycloaddition reactions to afford a series of the respective novel hetero annulated carbazoles such as isoxazolo-, pyrido- and pyrimido carbazoles. The structures of the compounds were established by FT-IR, (1)H NMR, (13)C NMR, X-ray diffraction and elemental analysis...
February 7, 2017: European Journal of Medicinal Chemistry
https://www.readbyqxmd.com/read/28213265/magnetic-mixed-hemimicelles-dispersive-solid-phase-extraction-based-on-ionic-liquid-coated-attapulgite-polyaniline-polypyrrole-fe3o4-nanocomposites-for-determination-of-acaricides-in-fruit-juice-prior-to-high-performance-liquid-chromatography-diode-array-detection
#3
Xiaoling Yang, Kexin Qiao, Fang Liu, Xiaoling Wu, Miyi Yang, Jing Li, Haixiang Gao, Sanbing Zhang, Wenfeng Zhou, Runhua Lu
In this research, a novel method using magnetic mixed hemimicelles dispersive solid-phase extraction (MMHDSPE) based on C16mimBr-coated attapulgite/polyaniline-polypyrrole/Fe3O4 (ATP/PANI-PPY/Fe3O4) nanocomposites were investigated for enrichment and separation of three acaricides in fruit juice. In this method, we combined the simplicity and speed of dispersive solid-phase extraction, the advantages of mixed hemimicelles and the facility of the phase separation of the magnetic nanoparticles to develop a simple, rapid, sensitive, and effective method for detecting target analytes from the juice samples...
May 1, 2017: Talanta
https://www.readbyqxmd.com/read/28213232/analysis-of-flavors-and-fragrances-by-hplc-with-fe3o4-go-magnetic-nanocomposite-as-the-adsorbent
#4
Rui Xiao, Xiaoting Zhang, Xiaona Zhang, Jiahua Niu, Minghua Lu, Xiuhua Liu, Zongwei Cai
In this article, a method for the analysis of flavors and fragrances including ethyl vanillin, trans-cinnamic acid, methyl cinnamate, ethyl cinnamate, and benzyl cinnamate in foods by HPLC with Fe3O4@GO nanocomposite as the adsorbent of magnetic solid-phase extraction was developed. The magnetic Fe3O4@GO nanocomposite was prepared and characterized by transmission electron microscope, infrared spectroscopy, X-ray diffraction and vibrating sample magnetometer. The as-prepared Fe3O4@GO nanocomposite was used as adsorbent for extraction and preconcentration of flavors and fragrances in foods...
May 1, 2017: Talanta
https://www.readbyqxmd.com/read/28213150/preparation-of-the-go-pd-nanocomposite-and-its-application-for-the-degradation-of-organic-dyes-in-water
#5
Afshan Omidvar, Babak Jaleh, Mahmoud Nasrollahzadeh
A GO/Pd nanocomposite has been successfully synthesized applying a simple method via immobilizing Pd on the surface of the graphene oxide (GO). The GO/Pd nanocomposite was characterized by X-ray diffraction (XRD), Fourier transformed infrared (FT-IR) spectroscopy, Raman, transmission electron microscopy (TEM), scanning electron microscopy (SEM) and energy dispersive X-ray spectroscopy (EDS) techniques. The surface morphology of Pd NPs was viewed by TEM, the particles are spherical with an average particle size of 11nm...
February 9, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28212933/surfactant-modified-chitosan-beads-for-cadmium-ion-adsorption
#6
Preeti Pal, Anjali Pal
Cadmium is one of the most toxic heavy metals, which has been classified as human carcinogen and tetratogen. In the present study chitosan (CS) beads are modified, in a novel way, using sodium dodecyl sulfate (SDS), a well known anionic surfactant. The concentration of SDS has been judiciously selected to form surfactant bilayers on CS surface. These modified beads are designated as surfactant-modified chitosan (SMCS) beads. The adsorbent has been characterized by scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR), and X-ray diffraction (XRD)...
February 14, 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/28212595/preparation-and-characterization-of-gold-nanoparticles-in-the-presence-of-citrate-and-soybean-seed-extract-in-an-acidic-conditions
#7
Ebrahim Izadi, Ali Rasooli, Abolfazl Akbarzadeh, Soodabeh Davaran
Through the present study, an eco-friendly method was used to synthesize the gold nanoparticles (GNPs) by using the sodium citrate and extract of the soybean seed as reducing the agents at PH 3. X-Ray diffraction (XRD) method was used to evaluate the crystal structure of as-synthesized NPs and it's revealed that this method leads to well crystallized GNPs. In order to determine the particle size and their distribution, field emission scanning microscopy (FE-SEM) and dynamic light scattering (DLS) were used...
February 17, 2017: Drug Research
https://www.readbyqxmd.com/read/28212513/simultaneous-removal-of-no-and-hg-0-over-ce-cu-modified-v2o5-tio2-based-commercial-scr-catalysts
#8
Guilong Chi, Boxiong Shen, Ranran Yu, Chuan He, Xiao Zhang
A series of novel Ce-Cu modified V2O5/TiO2 based commercial SCR catalysts were prepared via ultrasonic-assisted impregnation method for simultaneous removal of NO and elemental mercury (Hg(0)). Nitrogen adsorption, X-ray diffraction (XRD), temperature programmed reduction of H2 (H2-TPR) and X-ray photoelectron spectroscopy (XPS) were used to characterize the catalysts. 7% Ce-1% Cu/SCR catalyst exhibited the highest NO conversion efficiency (>97%) at 200-400°C, as well as the best Hg(0) oxidation activity (>75%) at 150-350°C among all the catalysts...
February 12, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28212032/chrodrimanins-k-n-and-related-meroterpenoids-from-the-fungus-penicillium-sp-scs-kfd09-isolated-from-a-marine-worm-sipunculus-nudus
#9
Fan-Dong Kong, Qing-Yun Ma, Sheng-Zhuo Huang, Pei Wang, Jun-Feng Wang, Li-Man Zhou, Jing-Zhe Yuan, Hao-Fu Dai, You-Xing Zhao
Six new meroterpenoids, chrodrimanins K-N (1-4), including two uncommon chlorinated ones (1 and 2), and verruculides B2 (5) and B3 (6), as well as seven known ones (7-13), were isolated from the fermentation broth of Penicillium sp. SCS-KFD09 isolated from a marine worm, Sipunculus nudus, from Haikou Bay, China. The structures including the absolute configurations of the new compounds were unambiguously elucidated by spectroscopic data, X-ray diffraction analysis, and ECD spectra analysis along with quantum ECD calculations...
February 17, 2017: Journal of Natural Products
https://www.readbyqxmd.com/read/28212027/ferromagnetic-coupling-in-the-heterospin-bis-catecholato-manganese-iv-complex-with-pyridine-substituted-by-nitronyl-nitroxide
#10
Michael P Bubnov, Irina A Teplova, Eugenia A Kopylova, Konstantin A Kozhanov, Artem S Bogomyakov, Marina V Petrova, Vitaly A Morozov, Victor I Ovcharenko, Vladimir K Cherkasov
A new bis(3,6-di-tert-butyl-catecholato)manganese complex with two 4-NIT-Py ligands was synthesized and characterized [4-NIT-Py = pyridine substituted at position 4 with nitronyl-nitroxide radical, 2-(pyridin-4-yl)-4,4,5,5-tetramethyl-4,5-dihydro-1H-imidazole-3-oxide-1-oxyl]. X-ray diffraction indicated an octahedral environment of the manganese atom with a trans arrangement of ligands. Bonds lengths in the inner coordination core of the metal and in the chelate cycles that are representative of the charge distribution between the metal and ligands displayed a Mn(IV)(Cat(2-))2 charge distribution...
February 17, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28211995/far-uv-annealed-inkjet-printed-in2o3-semiconductor-layers-for-tfts-on-flexible-pen-substrate
#11
Jaakko Henrik Leppäniemi, Kim Eiroma, Himadri Majumdar, Ari Alastalo
The inkjet-printing process of precursor solutions containing In-nitrate dissolved in 2-methoxyethanol is optimized using ethylene glycol as a co-solvent that allows the stabilization of the droplet formation, leading to a robust, repeatable printing process. The inkjet-printed precursor films are then converted to In2O3 semiconductors at flexible-substrate-compatible low-temperatures (150 - 200 °C) using combined far ultraviolet (FUV) exposure at ~160 nm and thermal treatment. The compositional nature of the precursor-to-metal oxide conversion is studied using grazing incidence X-ray diffraction (GIXRD), X-ray reflectivity (XRR) and Fourier transform infrared (FTIR) spectroscopy that indicate that amorphous, high density (up to 5...
February 17, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28211935/the-vertical-location-of-%C3%AE-tocopherol-in-phosphatidylcholine-membranes-is-not-altered-as-a-function-of-the-degree-of-unsaturation-of-the-fatty-acyl-chains
#12
Alessio Ausili, Ana M de Godos, Alejandro Torrecillas, Francisco J Aranda, Senena Corbalán-García, Juan C Gómez-Fernández
α-Tocopherol is a natural preservative that prevents free radical chain oxidations in biomembranes. We have studied the location of α-tocopherol in model membranes formed by different unsaturated phosphatidylcholines, namely 1-palmitoyl-2-oleoyl-sn-glycero-3-phosphocholine (POPC), 1-palmitoyl-2-linoleoyl-sn-glycero-3-phosphocholine (PLPC), 1-palmitoyl-2-arachidonoyl-sn-glycero-3-phosphocholine (PAPC) and 1-palmitoyl-2-docosahexaenoyl-sn-glycero-3-phosphocholine (PDPC). Small angle X-ray diffraction revealed that α-tocopherol was well mixed with all the phospholipids...
February 17, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28211923/electrical-and-photocatalytic-properties-of-boron-doped-zno-nanostructure-grown-on-pet-ito-flexible-substrates-by-hydrothermal-method
#13
Wei Wang, Taotao Ai, Qi Yu
Boron-doped zinc oxide sheet-spheres were synthesized on PET-ITO flexible substrates using a hydrothermal method at 90 °C for 5 h. The results of X-ray diffraction and X-ray photoelectron spectroscopy indicated that the B atoms were successfully doped into the ZnO lattice, the incorporation of B led to an increase in the lattice constant of ZnO and a change in its internal stress. The growth mechanism of pure ZnO nanorods and B-doped ZnO sheet-spheres was specifically investigated. The as-prepared BZO/PET-ITO heterojunction possessed obvious rectification properties and its positive turn-on voltage was 0...
February 13, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28211724/experimental-evidence-for-static-charge-density-waves-in-iron-oxypnictides
#14
A Martinelli, P Manfrinetti, A Provino, A Genovese, F Caglieris, G Lamura, C Ritter, M Putti
In this Letter we report high-resolution synchrotron x-ray powder diffraction and transmission electron microscope analysis of Mn-substituted LaFeAsO samples, demonstrating that a static incommensurate modulated structure develops across the low-temperature orthorhombic phase, whose modulation wave vector depends on the Mn content. The incommensurate structural distortion is likely originating from a charge-density-wave instability, a periodic modulation of the density of conduction electrons associated with a modulation of the atomic positions...
February 3, 2017: Physical Review Letters
https://www.readbyqxmd.com/read/28211359/electrodeposition-of-wo3-nanoparticles-into-surface-mounted-metal-organic-framework-hkust-1-thin-films
#15
Hyeonseok Yoo, Alexander Welle, Wei Guo, Jinsub Choi, Engelbert Redel
We describe a novel procedure to fabricate WO3@surface-mounted metal-organic framework (SURMOF) hybrid materials by electrodeposition of WO3 nanoparticles into HKUST-1, also termed Cu3(BTC)2 SURMOFs. These materials have been characterized using x-ray diffraction, time-of-flight secondary ion mass spectrometry, scanning electron microscopy, x-ray photoelectron spectroscopy as well as linear sweep voltammetry. The WO3 semiconductor/SURMOF heterostructures were further tested as hybrid electrodes in their performance for hydrogen evolution reaction from water...
March 17, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28211338/enhancement-of-the-adsorption-capacity-of-the-light-weight-expanded-clay-aggregate-surface-for-the-metronidazole-antibiotic-by-coating-with-mgo-nanoparticles-studies-on-the-kinetic-isotherm-and-effects-of-environmental-parameters
#16
Ebrahim Mohammadi Kalhori, Tariq J Al-Musawi, Esmaeil Ghahramani, Hossein Kazemian, Mansur Zarrabi
The synthesized MgO nanoparticles were used to coat the light-weight expanded clay aggregates (LECA) and as a metronidazole (MNZ) adsorbent. X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and Fourier-transformed infrared (FTIR) techniques were employed to study the surface morphology and characteristics of the adsorbents. MgO/LECA clearly revealed the advantages of the nanocomposite particles, showing high specific surface area (76.12 m(2)/g), significant adsorption sites and functional groups...
February 9, 2017: Chemosphere
https://www.readbyqxmd.com/read/28211298/kinneretia-thg-sqi4-mediated-biosynthesis-of-silver-nanoparticles-and-its-antimicrobial-efficacy
#17
Hina Singh, Juan Du, Tae-Hoo Yi
Simple, facile, effective approach for the biosynthesis of silver nanoparticles using Kinneretia species and its antimicrobial activity against human pathogens has been demonstrated in this study. Kinneretia THG-SQI4 has been isolated from soil sample collected from Shangqui, China. The synthesized nanoparticles were characterized by ultraviolet-visible spectrophotometry (UV-vis), field emission transmission electron microscopy (FE-TEM), energy dispersive X-ray spectroscopy (EDX), elemental mapping, selected area diffraction pattern, and X-ray diffraction (XRD)...
May 2017: Artificial Cells, Nanomedicine, and Biotechnology
https://www.readbyqxmd.com/read/28211267/efficient-and-selective-uptake-of-tco4-by-a-cationic-metal-organic-framework-material-with-open-ag-sites
#18
Daopeng Sheng, Lin Zhu, Chao Xu, Chengliang Xiao, Yanlong Wang, Yaxing Wang, Lanhua Chen, Juan Diwu, Jing Chen, Zhifang Chai, Thomas E Albrecht-Schmitt, Shuao Wang
99Tc is one of the most problematic radioisotopes in used nuclear fuel owing to its combined features of high fission yield, long half-life, and high environmental mobility. There are only a handful of functional materials that can remove TcO4- anion from aqueous solution and identifying for new, stable materials with high anion-exchange capacities, fast kinetics, and good selectivity remains a challenge. We report here an 8-fold interpenetrated three-dimensional cationic metal-organic framework material, SCU-100, which is assembled from a tetradentate neutral nitrogen-donor ligand and two-coordinate Ag+ cations as potential open metal sites...
February 17, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28211260/low-temperature-anharmonicity-in-cesium-chloride-cscl
#19
Mattia Sist, Karl Frederik Faerch Fischer, Hidetaka Kasai, Bo Brummerstedt Iversen
Anharmonic lattice vibrations govern heat transfer in materials, and anharmonicity is commonly assumed to be dominant at high temperature. The textbook cubic ionic defect-free crystal CsCl is shown to have an unexplained low thermal conductivity at room temperature (ca. 1 W/(m K)), which increases to around 13  W/(m K) at 25 K. Through high-resolution X-ray diffraction it is unexpectedly shown that the Cs atomic displacement parameter becomes anharmonic at 20 K.
February 17, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28210491/film-morphology-evolution-during-solvent-vapor-annealing-of-highly-efficient-small-molecule-donor-acceptor-blends
#20
Sebastian Engmann, Hyun Wook Ro, Andrew Herzing, Chad R Snyder, Lee J Richter, Paul B Geraghty, David J Jones
Solution-processable small molecule photovoltaics based on the novel molecular donor, benzodithiophene terthiophene rhodanine (BTR), recently have shown maximum power conversion efficiencies above 8 % for active layer thicknesses up to 400 nm, using post process solvent vapor annealing (SVA) with tetrahydrofuran (THF). Here we report an in-situ study on the morphology evolution during SVA using the moderate solvent THF and the good solvent chloroform (CF). The combination of real-time grazing incidence X-ray diffraction (GIXD) and grazing incidence small angle X-ray scattering (GISAXS) allows us to draw a complete picture of the evolution of crystallinity and phase purity during post process annealing...
October 28, 2016: Journal of Materials Chemistry. A, Materials for Energy and Sustainability
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