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https://www.readbyqxmd.com/read/28340521/stable-and-controllable-synthesis-of-silver-nanowires-for-transparent-conducting-film
#1
Bitao Liu, Hengqing Yan, Shanyong Chen, Youwei Guan, Guoguo Wu, Rong Jin, Lu Li
Silver nanowires without particles are synthesized by a solvothermal method at temperature 150 °C. Silver nanowires are prepared via a reducing agent of glycerol and a capping agent of polyvinylpyrrolidone (M w  ≈ 1,300,000). Both of them can improve the purity of the as-prepared silver nanowires. With controllable shapes and sizes, silver nanowires are grown continuously up to 10-20 μm in length with 40-50 nm in diameter. To improve the yield of silver nanowires, the different concentrations of AgNO3 synthesis silver nanowires are discussed...
December 2017: Nanoscale Research Letters
https://www.readbyqxmd.com/read/28340456/macroscopic-and-microscopic-investigation-of-adsorption-and-precipitation-of-zn-on-%C3%AE-alumina-in-the-absence-and-presence-of-as
#2
Yu-Jun Wang, Ting-Ting Fan, Cun Liu, Wei Li, Meng-Qiang Zhu, Jian-Xin Fan, Hua Gong, Dong-Mei Zhou, Donald L Sparks
Contaminants zinc (Zn) and arsenate (As) often coexist in soils. However, little is known concerning the impacts of coexisting As on Zn adsorption and precipitation on soil minerals. In the present study, adsorption and precipitation of Zn on γ-alumina in the absence and presence of arsenate was investigated employing batch experiments and Extended X-ray Absorption Fine Structure (EXAFS) spectroscopy. Results indicated that Zn formed edge-sharing tetrahedral surface complexes at pH 5.5 and Zn-Al LDH-like (layered double hydroxide) precipitates at pH 7...
March 21, 2017: Chemosphere
https://www.readbyqxmd.com/read/28340368/synthesis-molecular-docking-antimycobacterial-and-antimicrobial-evaluation-of-new-pyrrolo-3-2-c-pyridine-mannich-bases
#3
Gilish Jose, Tholappanavara H Suresha Kumara, Haliwana B V Sowmya, Dharmarajan Sriram, Tayur N Guru Row, Amar A Hosamani, Sunil S More, Bhavya Janardhan, B G Harish, Sandeep Telkar, Yalegara Siddappa Ravikumar
In this report, we describe the synthesis and biological evaluation of a new series of pyrrolo[3,2-c]pyridine Mannich bases (7a-v). The Mannich bases were obtained in good yields by one-pot three component condensation of pyrrolo[3,2-c]pyridine scaffold (6a-c) with secondary amines and excess of formaldehyde solution in AcOH. The chemical structures of the compounds were characterized by (1)H NMR, (13)C NMR, LC/MS and elemental analysis. Single crystal X-ray diffraction has been recorded for compound 7k ([C23H29ClN4](+2), H2O)...
March 16, 2017: European Journal of Medicinal Chemistry
https://www.readbyqxmd.com/read/28339348/geological-occurrence-mineralogical-characterization-and-risk-assessment-of-potentially-carcinogenic-erionite-in-italy
#4
Matteo Giordani, Michele Mattioli, Paolo Ballirano, Alessandro Pacella, Marco Cenni, Matteo Boscardin, Laura Valentini
Erionite is a zeolite representing a well-known health hazard. In fact, exposure of humans to its fibers has been unequivocally associated with occurrence of malignant mesothelioma. For this reason, a multi-methodological approach, based upon field investigation, morphological characterization, scanning electron microscopy (SEM)/energy-dispersive spectroscopy (EDS) chemical analysis, and structure refinement through X-ray powder diffraction (XRPD), was applied to different samples of potentially carcinogenic erionite from Northern Italy...
2017: Journal of Toxicology and Environmental Health. Part B, Critical Reviews
https://www.readbyqxmd.com/read/28339236/effect-of-biaxial-strain-on-the-phase-transitions-of-ca-fe_-1-x-co_-x-_-2-as_-2
#5
A E Böhmer, A Sapkota, A Kreyssig, S L Bud'ko, G Drachuck, S M Saunders, A I Goldman, P C Canfield
We study the effect of applied strain as a physical control parameter for the phase transitions of Ca(Fe_{1-x}Co_{x})_{2}As_{2} using resistivity, magnetization, x-ray diffraction, and ^{57}Fe Mössbauer spectroscopy. Biaxial strain, namely, compression of the basal plane of the tetragonal unit cell, is created through firm bonding of samples to a rigid substrate via differential thermal expansion. This strain is shown to induce a magnetostructural phase transition in originally paramagnetic samples, and superconductivity in previously nonsuperconducting ones...
March 10, 2017: Physical Review Letters
https://www.readbyqxmd.com/read/28339183/tunable-porosity-of-crosslinked-polyhedral-oligomeric-silsesquioxane-poss-supports-for-palladium-catalyzed-aerobic-alcohol-oxidation-in-water
#6
Preeyanuch Sangtrirutnugul, Thanawat Chaiprasert, Warodom Hunsiri, Thanudkit Jitjaroendee, Patsaya Songkhum, Kritapas Laohhasurayotin, Tanakorn Osotchan, Vuthichai Ervithayasuporn
Polyhedral oligomeric silsesquioxane (POSS)-based materials, poly-POSS-Tn [n = 8 (1), 10 (2), 12 (3), and mix (4)], were prepared in high yields via free radical polymerization of corresponding pure forms of methacrylate-functionalized POSS monomers, MMA-POSS-Tn (n = 8, 10, 12), and the mixture form, MMA-POSS-Tmix. Powder X-ray diffraction (XRD) spectra and BET analysis indicate that 1-4 are amorphous materials with high surface areas (683-839 m2•g-1). The surface areas and total pore volumes follow the trend: poly-POSS-T12 > poly-POSS-T10 > poly-POSS-Tmix > poly-POSS-T8...
March 24, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28339126/boron-doped-polygonal-carbon-nano-onions-synthesis-and-applications-in-electrochemical-energy-storage
#7
Marta Eliza Plonska-Brzezinska, Olena Mykhailiv, Krzysztof Brzezinski, Bogdan Sulikowski, Zbigniew Olejniczak, Malgorzata Gras, Grzegorz Lota, Agustin Molina-Ontoria, Michal Jakubczyk, Luis Echegoyen
Doping of carbon nanostructures with heteroatoms, such as boron or nitrogen, is one of the most effective ways to change their properties to make them suitable for various applications. Carbon nano-onions (CNOs) doped with boron (B-CNOs) have been prepared by annealing (1650°C) nanodiamond particles (NDs) under an inert He atmosphere in the presence of B. Their physicochemical properties were measured using transmission (TEM) and scanning (SEM) electron microscopy, X-ray photoelectron spectroscopy (XPS), 10B and 11B solid-state MAS NMR spectroscopy, X-ray powder diffractions (XRD), Raman spectroscopy, porosimetry, and differential-thermogravimetric analyses (TGA-DTG)...
March 24, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28338680/real-time-molecular-scale-observation-of-crystal-formation
#8
Roy E Schreiber, Lothar Houben, Sharon G Wolf, Gregory Leitus, Zhong-Ling Lang, Jorge J Carbó, Josep M Poblet, Ronny Neumann
How molecules in solution form crystal nuclei, which then grow into large crystals, is a poorly understood phenomenon. The classical mechanism of homogeneous crystal nucleation proceeds via the spontaneous random aggregation of species from liquid or solution. However, a non-classical mechanism suggests the formation of an amorphous dense phase that reorders to form stable crystal nuclei. So far it has remained an experimental challenge to observe the formation of crystal nuclei from five to thirty molecules...
April 2017: Nature Chemistry
https://www.readbyqxmd.com/read/28338322/hydrothermal-synthesis-of-the-oxofluoride-fesbo2f2-an-anti-ferromagnetic-spin-s-5-2-compound
#9
Sk Imran Ali, Reinhard K Kremer, Mats Johnsson
The new oxofluoride compound FeSbO2F2 was synthesized by hydrothermal techniques at 230 °C. Its crystal structure was determined from single-crystal X-ray diffraction data. The compound crystallizes in the monoclinic space group C2/c with one crystallographic site for Fe(3+) and Sb(3+), respectively. The crystal structure is made of [FeO2F4] octahedra and seesaw [SbO4] building blocks. These are connected to form [FeO2F2]n layers and [SbO2]n chains that bond together via the oxygen atoms to form the three-dimensional framework structure...
March 24, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28338319/postmetalated-zirconium-metal-organic-frameworks-as-a-highly-potent-bactericide
#10
Boushra Mortada, Tamara Abou Matar, Aya Sakaya, Hala Atallah, Zeinab Kara Ali, Pierre Karam, Mohamad Hmadeh
Metal-organic frameworks (MOFs) have emerged as an important class of hybrid organic-inorganic materials. One of the reasons they have gained remarkable attention is attributed to the possibility of altering them by postsynthetic modification, thereby providing access to new and novel advanced materials. MOFs have been applied in catalysis, gas storage, gas separation, chemical sensing, and drug delivery. However, their bactericidal use has rarely been explored. Herein, we developed a two-step process for the synthesis of zirconium-based MOFs metalated with silver cations as a potent antibacterial agent...
March 24, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28338315/solid-solution-alloying-of-immiscible-ru-and-cu-with-enhanced-co-oxidation-activity
#11
Bo Huang, Hirokazu Kobayashi, Tomokazu Yamamoto, Syo Matsumura, Yoshihide Nishida, Katsutoshi Sato, Katsutoshi Nagaoka, Shogo Kawaguchi, Yoshiki Kubota, Hiroshi Kitagawa
We report on novel solid-solution alloy nanoparticles (NPs) of Ru and Cu that are completely immiscible even above melting point in bulk phase. Powder X-ray diffraction, scanning transmission electron microscopy, and energy-dispersive X-ray measurements demonstrated that Ru and Cu atoms were homogeneously distributed in the alloy NPs. Ru0.5Cu0.5 NPs demonstrated higher CO oxidation activity than fcc-Ru NPs, which are known as one of the best monometallic CO oxidation catalysts.
March 24, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28338288/a-comparison-inhibitory-effects-of-cisplatin-and-mnps-peg-cisplatin-on-the-adhesion-capacity-of-bone-metastatic-breast-cancer
#12
Mohammad Javad Mokhtari, Fatemeh Koohpeima, Hadi Mohammadi
To date, high mortality in women due to malignancy breast cancer related to the metastasis to the bone is a significant challenge. Since, magnetic nanoparticles (MNPs) conjugated with the biocompatible polymers was employed for the delivery of some hydrophobic anti-cancer agents, so the main aim of the current research was to assess whether cisplatin-loaded MNPs enhanced the anti-cancer effect of free cisplatin in breast cancer cells.MNPs decorated with PEG were synthesized by an improved co-precipitation technique, and then cisplatin was loaded onto the MNPs via a simple mixing method...
March 24, 2017: Chemical Biology & Drug Design
https://www.readbyqxmd.com/read/28337842/halogenated-briarane-diterpenes-with-acetyl-migration-from-the-gorgonian-coral-junceella-fragilis
#13
Wei Cheng, Xiaodan Li, Fuling Yin, Leen van Ofwegen, Wenhan Lin
Chemical examination of the gorgonian coral Junceella fragilis resulted in the isolation of four pairs of acetyl isomers belonging to briarane diterpenoids, including five new compounds. Their structures were determined on the basis of extensive spectroscopic (IR, MS, NMR and single-crystal X-ray diffraction) analysis in association with the chemical conversion. Each pair of isomers featured by dynamical interconversion through as acetyl migration in 1,2-diol, which was postulated to be generated under the formation of a cyclic orthoacetate intermediate...
March 24, 2017: Chemistry & Biodiversity
https://www.readbyqxmd.com/read/28337702/synthesis-and-characterization-of-surface-modified-fluorescent-and-biocompatible-zns-nanoparticles-with-a-hydrophobic-chitosan-derivative
#14
B Jothimani, S Sureshkumar, B Venkatachalapathy
The introduction of a hydrophobic moiety on chitosan enhances the self-assembling properties, mucoadhesion, the permeability of the macromolecule and aids in target specific delivery. Our group synthesized a hydrophobic trans N-(6,6-Dimethyl-2-hepten-4-ynyl)chitosan derivative (CSD) and studied the surface modification of ZnS nanoparticles in a single pot reaction. X-ray diffraction studies and FESEM imaging confirms the nano size and morphology of the surface modified Zinc sulfide nanoparticles (ZnS-CSD NPs)...
March 23, 2017: Journal of Fluorescence
https://www.readbyqxmd.com/read/28337620/date-palm-waste-derived-biochar-composites-with-silica-and-zeolite-synthesis-characterization-and-implication-for-carbon-stability-and-recalcitrant-potential
#15
Munir Ahmad, Mahtab Ahmad, Adel R A Usman, Abdullah S Al-Faraj, Adel Abduljabbar, Yong Sik Ok, Mohammad I Al-Wabel
Engineered organo-mineral composites were synthesized from date palm waste biochar and silica or zeolite via mechanochemical treatments. Date palm tree rachis (leaves) waste biomass was pre-treated with silica or zeolite minerals via ball milling and sonication prior to pyrolysis at 600 °C. The resultant organo-mineral composites and pristine materials were characterized using X-ray diffraction, thermogravimetric-differential thermal (TG-DTA), Fourier transform infrared, scanning electron microscope analyses and surface area and porosity analyzer to investigate the variations in physiochemical and structural characteristics...
March 23, 2017: Environmental Geochemistry and Health
https://www.readbyqxmd.com/read/28337345/effective-role-of-cao-p2o5-ratio-on-sio2-cao-p2o5-glass-system
#16
P Kiran, V Ramakrishna, M Trebbin, N K Udayashankar, H D Shashikala
In the present work, the effect of the CaO/P2O5 ratio on the composition of sol-gel synthesized 58SiO2-(19 - x)P2O5-(23 + x)CaO (x = 0, 5, 10 and 15 mol%) glass samples was studied. Further, the effect of NBO/BO ratio on hydroxy carbonated apatite layer (HCA) forming ability based on dissolution behavior in simulated body fluid (SBF) solution was also investigated. CaO/P2O5 ratios of synthesized glass samples were 1.2, 2, 3.6, and 9.5, respectively. NBO/BO ratios were obtained using Raman spectroscopic analysis as 0...
May 2017: Journal of Advanced Research
https://www.readbyqxmd.com/read/28336897/three-dimensional-bioi-biox-x-cl-or-br-nanohybrids-for-enhanced-visible-light-photocatalytic-activity
#17
Yazi Liu, Jian Xu, Liqiong Wang, Huayang Zhang, Ping Xu, Xiaoguang Duan, Hongqi Sun, Shaobin Wang
Three-dimensional flower-like BiOI/BiOX (X = Br or Cl) hybrids were synthesized via a facile one-pot solvothermal approach. With systematic characterizations by X-ray diffraction (XRD), scanning electron microscopy (SEM), Transmission electron microscopy (TEM), the Brunauer-Emmett-Teller (BET)specific surface area, X-ray photoelectron spectroscopy (XPS), and the UV-Vis diffuse reflectance spectra (DRS), the BiOI/BiOCl composites showed a fluffy and porous 3-D architecture with a large specific surface area (SSA) and high capability for light absorption...
March 14, 2017: Nanomaterials
https://www.readbyqxmd.com/read/28336894/fabrication-of-functional-polyurethane-rare-earth-nanocomposite-membranes-by-electrospinning-and-its-vocs-absorption-capacity-from-air
#18
Jun Cong Ge, Nag Jung Choi
Volatile organic compounds (VOCs) are a source of air pollution and are harmful to both human health and the environment. In this study, we fabricated polyurethane/rare earth (PU/RE) composite nanofibrous membranes via electrospinning with the aim of removing VOCs from air. The morphological structure of PU/RE nanofibrous mats was investigated using field emission scanning electron microscopy (FE-SEM), fourier transform infrared spectroscopy (FTIR), and X-ray diffraction (XRD) experimental analyses. A certain amount of RE (up to 50 wt...
March 11, 2017: Nanomaterials
https://www.readbyqxmd.com/read/28336888/microwave-hydrothermal-synthesis-of-sno2-cnts-hybrid-nanocomposites-with-visible-light-photocatalytic-activity
#19
Shuisheng Wu, Weili Dai
SnO2 nanoparticles coated on carbon nanotubes (CNTs) were prepared via a simple microwave-hydrothermal route. The as-obtained SnO2-CNTs composites were characterized using X-ray powder diffraction, Raman spectroscopy, and transmission electron microscopy. The photocatalytic activity of as-prepared SnO2-CNTs for degradation of Rhodamine B under visible light irradiation was investigated. The results show that SnO2-CNTs nanocomposites have a higher photocatalytic activity than pure SnO2 due to the rapid transferring of electrons and the effective separation of holes and electrons on SnO2-CNTs...
March 3, 2017: Nanomaterials
https://www.readbyqxmd.com/read/28336887/sio2-zno-composite-hollow-sub-micron-fibers-fabrication-from-facile-single-capillary-electrospinning-and-their-photoluminescence-properties
#20
Guanying Song, Zhenjiang Li, Kaihua Li, Lina Zhang, Alan Meng
In this work, SiO2/ZnO composite hollow sub-micron fibers were fabricated by a facile single capillary electrospinning technique followed by calcination, using tetraethyl orthosilicate (TEOS), polyvinylpyrrolidone (PVP) and ZnO nanoparticles as raw materials. The characterization results of the scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD) and Fourier transform infrared spectroscopy (FT-IR) spectra indicated that the asprepared composite hollow fibers consisted of amorphous SiO2 and hexagonal wurtzite ZnO...
February 24, 2017: Nanomaterials
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