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https://www.readbyqxmd.com/read/28449548/vibration-induced-property-change-in-the-melting-and-solidifying-process-of-metallic-nanoparticles
#1
Yonggang Zheng, Liquan Ding, Hongfei Ye, Zhen Chen
Tuning material properties in the 3-D printing process of metallic parts is a challenging task of current interests. Much research has been conducted to understand the effects of controlling parameters such as the particle geometry (size and shape), heating, and cooling ways on the outcome of the printing process. However, nothing has been done to explore the system vibration effect. This letter reports our findings on the vibration-induced property change in the melting and solidifying process of silver nanoparticles with the use of molecular dynamics simulation...
December 2017: Nanoscale Research Letters
https://www.readbyqxmd.com/read/28449406/a-water-stable-dual-channel-luminescence-sensor-for-uo22-ion-based-on-an-anionic-terbium-iii-metal-organic-framework
#2
Junwei Ye, Raji Feyisa Bogale, Yangwei Shi, Yanzhen Chen, Xigang Liu, Yaoyao Yang, Siqi Zhang, Jianzhang Zhao, Guiling Ning
A stable 3D Tb(III)-based metal-organic framework [Tb(BPDC)2]*(CH3)2NH2 (DUT-101) was synthesized, and it is the first efficient dual-channel luminescence sensor for aqueous UO22+ ion. DUT-101 possesses an anionic three-dimensional framework and protonated dimethylamine molecules embedded within the channels. Intense green emission of DUT-101 could be highly selectively and sensitively quenched by UO22+ ions even in the coexistence of other competing metal ions. The possible sensing mechanism was proposed as well based on both suppression of luminescence resonance energy transfer and enhancement of intermolecular electronic transfer...
April 27, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28449264/macroscopically-oriented-porous-materials-with-periodic-ordered-structures-from-zeolites-and-metal-organic-frameworks-to-liquid-crystal-templated-mesoporous-materials
#3
REVIEW
Joonil Cho, Yasuhiro Ishida
Porous materials with molecular-sized periodic structures, as exemplified by zeolites, metal-organic frameworks, or mesoporous silica, have attracted increasing attention due to their range of applications in storage, sensing, separation, and transformation of small molecules. Although the components of such porous materials have a tendency to pack in unidirectionally oriented periodic structures, such ideal types of packing cannot continue indefinitely, generally ceasing when they reach a micrometer scale...
April 27, 2017: Advanced Materials
https://www.readbyqxmd.com/read/28449258/improve-toolmarks-impressions-in-soft-wax
#4
Nir Finkelstein, Nikolai Volkov, Tsadok Tsach
When the forensic toolmarks laboratory receives for examination and comparison a tool that is suspected of having been involved in a crime, the expert performs tests designed to determine whether or not the specific tool generates the same toolmarks as those found at the crime scene. This is performed by testing tool striation on a piece of soft metal, such as lead, and examining the marks left by the tool. Studies have shown that wax may be an optimal material for this purpose. This study examines the use of wax at different temperatures and shows that quality of results is better when the wax is cooled (recommended temperature is -18°C)...
May 2017: Journal of Forensic Sciences
https://www.readbyqxmd.com/read/28449245/characterization-of-a-poly-4-vinylpyridine-supported-cupd-bimetallic-catalyst-for-sonogashira-coupling-reactions
#5
Claudio Evangelisti, Antonella Balerna, Rinaldo Psaro, Graziano Fusini, Adriano Carpita, Maurizio Benfatto
CuPd bimetallic Solvated Metal Atoms (SMA) synthesized by metal vapor synthesis (MVS) technique and supported on poly-4-vinylpyridine (PVPy) resin, showed signicantly higher catalytic activity in Sonogashira-type carbon-carbon coupling reactions than the corresponding monometallic Cu and Pd systems as well as their physical mixture. The analysis of the bimetallic catalyst combining high-resolution transmission electron microscopy (HRTEM) and x-ray absorption ne structure (XAFS) spectroscopy revealed the presence of small Pd nanoparticles (dm = 2...
April 27, 2017: Chemphyschem: a European Journal of Chemical Physics and Physical Chemistry
https://www.readbyqxmd.com/read/28449188/development-validation-and-testing-of-a-skin-sampling-method-for-assessment-of-metal-exposure
#6
Behnaz Erfani, Klara Midander, Carola Lidén, Anneli Julander
BACKGROUND: Nickel, cobalt and chromium are frequent skin sensitizers. Skin exposure results in eczema in sensitized individuals, the risk being related to the skin dose. OBJECTIVES: To develop a self-sampling method for quantification of skin exposure to metals, to validate the method, and to assess its feasibility. METHODS: Defined metal doses (0.01-5 µg) were applied to the fingers of 5 participants. Skin areas (2 cm(2) ) were sampled with 1% HNO3 , either as 0...
April 27, 2017: Contact Dermatitis
https://www.readbyqxmd.com/read/28448918/erosion-of-the-alberta-badlands-produces-highly-variable-and-elevated-heavy-metal-concentrations-in-the-red-deer-river-alberta
#7
Jason G Kerr, Colin A Cooke
Erosion is important in the transport of heavy metals from terrestrial to fluvial environments. In this study, we investigated riverine heavy metal (Cd, Cu, Hg and Pb) dynamics in the Red Deer River (RDR) watershed at sites upstream (n=2) and downstream (n=7) of the Alberta badlands, an area of naturally high erosion. At sites draining the badlands, total water column Cd, Cu, Hg and Pb concentrations frequently exceeded guidelines for the protection of freshwater biota. Furthermore, peak concentrations of total Cd (9...
April 24, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28448913/temporal-characterization-of-flowback-and-produced-water-quality-from-a-hydraulically-fractured-oil-and-gas-well
#8
James Rosenblum, Andrew W Nelson, Bridger Ruyle, Michael K Schultz, Joseph N Ryan, Karl G Linden
This study examined water quality, naturally-occurring radioactive materials (NORM), major ions, trace metals, and well flow data for water used and produced from start-up to operation of an oil and gas producing hydraulically-fractured well (horizontal) in the Denver-Julesburg (DJ) Basin in northeastern Colorado. Analysis was conducted on the groundwater used to make the fracturing fluid, the fracturing fluid itself, and nine flowback/produced water samples over 220days of operation. The chemical oxygen demand of the wastewater produced during operation decreased from 8200 to 2500mg/L, while the total dissolved solids (TDS) increased in this same period from 14,200 to roughly 19,000mg/L...
April 24, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28448909/changes-in-heavy-metal-mobility-and-availability-from-contaminated-wetland-soil-remediated-with-combined-biochar-compost
#9
Jie Liang, Zhaoxue Yang, Lin Tang, Guangming Zeng, Man Yu, Xiaodong Li, Haipeng Wu, Yingying Qian, Xuemei Li, Yuan Luo
The combination of biochar and compost has been proven to be effective in heavy metals contaminated wetland soil restoration. However, the influence of different proportions between biochar and compost on immobilization of heavy metals in soil has been less studied up to date. Therefore, we investigated the effect of different ratios of biochar-compost mixtures on availability and speciation distribution of heavy metals (Cd, Zn and Cu) in wetland soil. The results showed that applying all amendment combinations into wetland soil increased gradually the total organic carbon (TOC) and water-extract organic carbon (WEOC) as the compost percentage rose in biochar-composts...
April 24, 2017: Chemosphere
https://www.readbyqxmd.com/read/28448879/adsorption-of-organic-arsenic-acids-from-water-over-functionalized-metal-organic-frameworks
#10
Mithun Sarker, Ji Yoon Song, Sung Hwa Jhung
Organic arsenic acids (OAAs) are regarded as water pollutants because of their toxicity and considerable solubility in water. Adsorption of OAAs such as phenylarsonic acid (PAA) and p-arsanilic acid (ASA) from water was investigated over functionalized (with OH groups) metal-organic framework (MOF, MIL-101), as well as over pristine MIL-101 and commercial activated carbon. The highly porous MIL-101 bearing three hydroxyl groups (MIL-101(OH)3) exhibited remarkable PAA and ASA adsorption capacities. Based on the effects of pH on PAA and ASA adsorption, hydrogen bonding was suggested as a plausible mechanism of OAA adsorption...
April 19, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28448877/synthesis-structure-and-cytotoxicity-of-a-series-of-dioxidomolybdenum-vi-complexes-featuring-salan-ligands
#11
Satabdi Roy, Monalisa Mohanty, Sagarika Pasayat, Sudarshana Majumder, Kulanthaivel Senthilguru, Indranil Banerjee, Martin Reichelt, Hans Reuter, Ekkehard Sinn, Rupam Dinda
Seven hexacoordinated cis-dioxidomolybdenum(VI) complexes [MoO2L(1-7)] (1-7) derived from various tetradentate diamino bis(phenolato) "salan" ligands, N,N'-dimethyl-N,N'-bis-(2-hydroxy-3-X-5-Y-6-Z-benzyl)-1,2-diaminoethane {(X=Br, Y=Me, Z=H (H2L(1)); X=Me, YCl, Z=H (H2L(2)); X=(i)Pr, Y=Cl, Z=Me (H2L(3))} and N,N'-bis-(2-hydroxy-3-X-5-Y-6-Z-benzyl)-1,2-diaminopropane {(X=Y=(t)Bu, Z=H (H2L(4)); X=Y=Me, Z=H (H2L(5)); X=(i)Pr, YCl, Z=Me (H2L(6)); X=Y=Br, Z=H (H2L(7))} containing O-N donor atoms, have been isolated and structurally characterized...
April 18, 2017: Journal of Inorganic Biochemistry
https://www.readbyqxmd.com/read/28448811/effect-of-addition-of-sewage-sludge-and-coal-sludge-on-bioavailability-of-selected-metals-in-the-waste-from-the-zinc-and-lead-industry
#12
Jolanta Sobik-Szołtysek, Katarzyna Wystalska, Anna Grobelak
This study evaluated the content of bioavailable forms of selected heavy metals present in the waste from Zn and Pb processing that can potentially have an effect on the observed difficulties in reclamation of landfills with this waste. The particular focus of the study was on iron because its potential excess or deficiency may be one of the causes of the failure in biological reclamation. The study confirmed that despite high content of total iron in waste (mean value of 200.975gkg(-1)), this metal is present in the forms not available to plants (mean: 0...
April 24, 2017: Environmental Research
https://www.readbyqxmd.com/read/28448711/-cemented-polyethylene-insert-in-a-well-fixed-total-knee-replacement-case-report
#13
F E García-Dobarganes Barlow, J Negrete-Corona, A A Díaz-Tovar
We present the case of a 94 years- old patient, which was operated 14 years ago of a right total knee replacement for osteoarthritis, actually she suffers of pain and instability; her X ray shown polyethylene wear without loosening of the metal components. The polyethylene insert is not manufactured anymore so we decided cement a new polyethylene insert on the native tibial baseplate. The two years follow up show us a patient asymptomatic, good function and no radiolucencies on the tibial component. We only found a similar case report in Madrid and we believed that this decision, taken from total hip revisions, will succeed...
September 2016: Acta Ortopédica Mexicana
https://www.readbyqxmd.com/read/28448621/biochar-from-kon-tiki-flame-curtain-and-other-kilns-effects-of-nutrient-enrichment-and-kiln-type-on-crop-yield-and-soil-chemistry
#14
Naba Raj Pandit, Jan Mulder, Sarah Elisabeth Hale, Hans Peter Schmidt, Gerard Cornelissen
Biochar application to soils has been investigated as a means of improving soil fertility and mitigating climate change through soil carbon sequestration. In the present work, the invasive shrub "Eupatorium adenophorum" was utilized as a sustainable feedstock for making biochar under different pyrolysis conditions in Nepal. Biochar was produced using several different types of kilns; four sub types of flame curtain kilns (deep-cone metal kiln, steel shielded soil pit, conical soil pit and steel small cone), brick-made traditional kiln, traditional earth-mound kiln and top lift up draft (TLUD)...
2017: PloS One
https://www.readbyqxmd.com/read/28448589/morpho-physiological-analysis-of-tolerance-to-aluminum-toxicity-in-rice-varieties-of-north-east-india
#15
Jay Prakash Awasthi, Bedabrata Saha, Preetom Regon, Smita Sahoo, Umakanta Chowra, Amit Pradhan, Anupam Roy, Sanjib Kumar Panda
Aluminum (Al) is the third most abundant metal in earth crust, whose chemical form is mainly dependent on soil pH. The most toxic form of Al with respect to plants is Al3+, which exists in soil pH <5. Acidic soil significantly limits crop production mainly due to Al3+ toxicity worldwide, impacting approximately 50% of the world's arable land (in North-Eastern India 80% soil are acidic). Al3+ toxicity in plants ensues root growth inhibition leading to less nutrient and water uptake impacting crop productivity as a whole...
2017: PloS One
https://www.readbyqxmd.com/read/28448276/white-light-emission-of-monolithic-ingan-gan-grown-on-morphology-controlled-nanostructured-gan-templates
#16
Keun Man Song, Do Hyun Kim, Jong Min Kim, Chu-Young Cho, Jehyuk Choi, Ka Hee Kim, Jinsub Park, Hogyoung Kim
We demonstrated an InGaN/GaN-based, monolithic, white light-emitting diode (LED) without phosphors by using morphology-controlled active layers formed on multi-facet GaN templates containing polar and semipolar surfaces. The nanostructured surface morphology was controlled by changing the growth time, and distinct multiple photoluminescence peaks were observed at 360, 460, and 560 nm; these features were caused by InGaN/GaN-based multiple quantum wells (MQWs) on the nanostructured facets. The origin of each multi-peak was related to the different indium (In) compositions in the different planes of the quantum wells grown on the nanostructured GaN...
April 27, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28448153/on-the-thermal-stability-of-metal-nanocrystals-an-investigation-of-the-surface-and-bulk-reconstructions-of-pd-concave-icosahedra
#17
Kyle D Gilroy, Ahmed O Elnabawy, Tung-Han Yang, Luke T Roling, Jane Howe, Manos Mavrikakis, Younan Xia
Despite the remarkable success in controlling the synthesis of metal nanocrystals, it still remains a grand challenge to stabilize and preserve the shapes or internal structures of metastable kinetic products. In this work, we address this issue by systematically investigating the surface and bulk reconstructions experienced by a Pd concave icosahedron when subjected to heating up to 600 (o)C in vacuum. We used in situ high-resolution transmission electron microscopy to identify the equilibration pathways of this far-from-equilibrium structure...
April 27, 2017: Nano Letters
https://www.readbyqxmd.com/read/28448147/binding-of-small-gas-molecules-by-metal-bipyridyl-monocationic-complexes-metal-cu-ag-au-and-possible-bond-activations-therein
#18
Gourhari Jana, Sudip Pan, Pratim Kumar Chattaraj
The viability of a series of small gas molecules (H2, N2, CO, CO2, H2O, H2S, C2H2, CH4, CH3Cl, C2H4, and C2H6) bound [M-(bipy)](+) (bipy = bipyridyl; M = Cu, Ag, Au) complexes is investigated at the PBE0/cc-pVTZ/cc-pVTZ-PP level with a special emphasis on the possible bond activation within the bound ligands. While the bond dissociation energy, enthalpy change, and free energy change are computed to show the stability of the complexes with respect to the dissociation into [M-(bipy)]+ and free gas molecule (L), natural bond orbital, electron density, and energy decomposition analyses in conjunction with natural orbitals for chemical valence are carried out to characterize the nature of L-M bonds...
April 27, 2017: Journal of Physical Chemistry. A
https://www.readbyqxmd.com/read/28448113/a-solvent-free-chemical-approach-to-synthesize-various-morphological-co3o4-for-co-oxidation
#19
Kun Wang, Yali Cao, Jindou Hu, Yizhao Li, Jing Xie, Dianzeng Jia
The synthesis of Co3O4 nanomaterials with diverse morphologies were usually synthesized in liquid phase accompanied by the template or surfactant, even harsh conditions, which further restricted their practical application. Herein, we reported an extremely simple and practical solid-state chemical method to synthesize Co3O4-octahedrons, -plates and -rods. Among these, the shape control of Co3O4-octahedrons and Co3O4-plates involve the variation of the amount of reactant, and the formation of Co3O4-rods with {110} facet can be achieved by replacing the reactant...
April 27, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28448112/real-time-imaging-of-2d-and-3d-temperature-distribution-coating-of-metal-ion-intercalated-organic-layered-composites-with-tunable-stimuli-responsive-properties
#20
Machi Takeuchi, Hiroaki Imai, Yuya Oaki
Organic layered materials have intercalation and dynamic properties. The dynamic properties are tuned by the intercalation of the guests. In general, howevver, it is not easy to achieve homogeneous and thin coating of the layered materials on substrates with complex shapes because of the two-dimentional anisotropic structures. In the present work, the layered organic composites were homogeneously coated on a variety of substrates for application to practical devices. The metal-ion-intercalated layered polydiacetylene (PDA-Mn+) with tunable stimuli-responsive color-change properties was coated on substrates, such as paper and cotton consisting of cellulose fibers...
April 27, 2017: ACS Applied Materials & Interfaces
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