Read by QxMD icon Read


Hyun-Chul Kim, Seong Huh, Do Nam Lee, Youngmee Kim
Lewis basic heteroatoms orderly located inside the well-defined channels of metal-organic frameworks (MOFs) are potentially ideal active sites for selective gas sorption and catalysis. To develop functional MOFs with Lewis basic sites inside channels, a new C2h-symmetric dicarboxylate-based bridging ligand, 3,3'-(pyrazine-2,5-diyl)dibenzoic acid (3,3'-PDBA), was prepared by a Suzuki coupling reaction. Subsequently, two new Zn-MOFs containing the C2h-symmetric 3,3'-PDBA bridging ligand and two different bis(pyridyl)-based pillars, 1,2-bis(4-pyridyl)ethane (bpa) or 1,2-bis(4-pyridyl)ethylene (bpe), were prepared through a thermal reaction in N,N-dimethylformamide (DMF)...
March 21, 2018: Dalton Transactions: An International Journal of Inorganic Chemistry
Ali Nayfeh, Thamer Kassim, Noor Addasi, Faysal Alghoula, Christopher Holewinski, Zachary Depew
Background: Mercury exists in multiple forms: elemental, organic, and inorganic. Its toxic manifestations depend on the type and magnitude of exposure. The role of colonoscopic decompression in acute mercury toxicity is still unclear. We present a case of acute elemental mercury toxicity secondary to mercury ingestion, which markedly improved with colonoscopic decompression. Clinical Case: A 54-year-old male presented to the ED five days after ingesting five ounces (148 cubic centimeters) of elemental mercury...
2018: Case Reports in Medicine
Hyon-Min Song, Jeffrey I Zink
Seedless synthesis of Pd nanorods and their self-assembly into the layered smectic ordering is described. Aqueous Pluronic triblock copolymers (14.3% - 35.7%) are used as a soft template along with cetyltrimethylammonium bromide (CTAB) for inducing one-dimensional growth of Pd nanorods. Pluronic triblock copolymers are probably the most used polymer surfactants, and they are composed of PEO(polyethylene oxide)-PPO(polypropylene oxide)-PEO triblocks. Neither pH adjustment, nor AgNO3, nor other additives such as polyvinyl pyrolidone, and ethylene glycol are required to obtain Pd nanorods...
March 20, 2018: Langmuir: the ACS Journal of Surfaces and Colloids
Dandan Huang, Huiqing Guo
Livestock odor properties have not been well understood and the role of hedonic tone (HT) in establishing appropriate odor impact criteria has not been investigated. Five odor properties, including odor concentration (OC), intensity (OI), HT, persistence, and character descriptor, were studied for odorous air from a commercial dairy barn, layer barn, and broiler barn by taking measurements in all four seasons. The seasonal OC of the dairy, layer, and broiler barns averaged 447±162OUm-3 , 583±216OUm-3 , and 766±148OUm-3 , respectively...
March 5, 2018: Science of the Total Environment
Elisa Rebolini, Gustav Baardsen, Audun Skau Hansen, Karl Roald Leikanger, Thomas Bondo Pedersen
We present a generalization of the divide-expand-consolidate (DEC) framework for local coupled-cluster calculations to periodic systems and test it at the second-order Møller-Plesset (MP2) level of theory. For simple model systems with periodicity in one, two, and three dimensions, comparisons with extrapolated molecular calculations and the local MP2 implementation in the Cryscor program show that the correlation energy errors of the extended DEC (X-DEC) algorithm can be controlled through a single parameter, the fragment optimization threshold...
March 19, 2018: Journal of Chemical Theory and Computation
Waldemar Kaiser, Tim Albes, Alessio Gagliardi
Low charge carrier mobility is one key factor limiting the performance and applicability of devices based on organic semiconductors. Theoretical studies on mobility using the kinetic Monte Carlo or master equation are mainly based on a Gaussian energetic disorder and regular cubic lattices. The dependence of mobility on the electric field, temperature and charge carrier density is well studied for the Gaussian disorder model. In this work, we investigate the influence of spatially correlated site energies and spatial disorder in the lattice sites on the mobility using kinetic Monte Carlo simulations...
March 19, 2018: Physical Chemistry Chemical Physics: PCCP
Yangbo Wang, Bingxiao Yang, Kun Chen, Enlong Zhou, Qinghua Zhang, Lisha Yin, Xiaoji Xie, Lin Gu, Ling Huang
Scandium (Sc) sits at a unique position in the periodic table, i.e., the junction of the top of the rare earth column and the beginning of the transition metal row. Studies have shown that Sc-based nanomaterials are very sensitive to the surrounding chemical environment. A simple adjustment of the chemical reaction conditions such as temperature, surfactant molecules, and solvents (e.g., oleic acid (OA) or 1-octadecene (OD)) can easily lead to different products in terms of chemical composition and phase structure...
March 19, 2018: Dalton Transactions: An International Journal of Inorganic Chemistry
Sho Kataoka, Yoshihiro Kamimura, Akira Endo
Hybrid organic-inorganic layered perovskites are typically non-porous solids. However, the incorporation of silsesquioxanes with a cubic cage structure as interlayer materials creates micropores between the perovskite layers. In this study, we increase in the micropore volume in layered perovskites by replacing a portion of the silsesquioxane interlayers with organic amines. In the proposed method, approximately 20% of the silsesquioxane interlayers can be replaced without changing the layer distance owing to the size of the silsesquioxane...
March 18, 2018: Langmuir: the ACS Journal of Surfaces and Colloids
Zeinab Haghparasti, Mahnaz Mahdavi Shahri
The use of nontoxic biological compounds in the synthesis of nanomaterials is an ecofriendly and cost-effective approach in nanotechnology. The present work was carried out to develop silver nanoparticles (Ag-NPs) by a green method using white tea (Wt) extract as reducing agent for reduction of silver nitrate as silver precursor into the lamellar space of inorganic polymer montmorillonite (Mt) as an effective protective reagent and support as well. The bioformed Wt/Ag@Mt nanocomposite (NCs) was compared with pure biosynthesized Wt/Ag-NPs under free stabilizer condition and effect of Mt stabilizer on antioxidant, cytotoxicity and structural properties were also investigated...
June 1, 2018: Materials Science & Engineering. C, Materials for Biological Applications
Elzbieta Weryszko-Chmielewska, Idalia Kasprzyk, Malgorzata Nowak, Aneta Sulborska, Joanna Kaczmarek, Agata Szymanska, Weronika Haratym, Miroslaw Gilski, Malgorzata Jedryczka
The spores of Cladosporium Link. are often present in the air in high quantities and produce many allergenic proteins, which may lead to asthma. An aerobiological spore monitoring program can inform patients about the current spore concentration in air and help their physicians determine the spore dose that is harmful for a given individual. This makes it possible to develop optimized responses and propose personalized therapy for a particular sensitive patient. The aim of this study was to assess the extent of the human health hazard posed by the fungal genus Cladosporium...
March 2018: Journal of Environmental Sciences (China)
Daxing Xiong
We address the issue of whether the golden-mean [ψ=(sqrt[5]+1)/2≃1.618] universality class, as predicted by several theoretical models, can be observed in the dynamical scaling of thermal transport. Remarkably, we show strong evidence that ψ appears to be the scaling exponent of heat mode correlation in a purely quartic anharmonic chain. This observation seems to somewhat deviate from the previous expectation and we explain it by the unusual slow decay of the cross correlation between heat and sound modes...
February 2018: Physical Review. E
C J Bradly, A L Owczarek, T Prellberg
Recently, it has been proposed that the adsorption transition for a single polymer in dilute solution, modeled by lattice walks in three dimensions, is not universal with respect to intermonomer interactions. Moreover, it has been conjectured that key critical exponents ϕ, measuring the growth of the contacts with the surface at the adsorption point, and 1/δ, which measures the finite-size shift of the critical temperature, are not the same. However, applying standard scaling arguments the two key critical exponents should rather be identical, hence pointing to a potential breakdown of these standard scaling arguments...
February 2018: Physical Review. E
A Garbout, M Férid
Considering the features in changing the structure and properties of rare earth titanates pyrochlores, the substituted Dy2 Ti2 O7 may be very attractive for various applications. Effect of Sm and Y substitution on the structural properties of Dy2 Ti2 O7 ceramic was established. These ceramics were prepared by solid-state reaction and characterized by X-ray diffraction and Raman spectroscopy. Both analysis show that YDyTi2 O7 with the pyrochlore structure is obtained after heating at 1400°C, but SmDyTi2 O7 has already formed after sintering at 1200°C...
March 10, 2018: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
Si Xuan She, Jie Yu, Wan Qi Tang, Yinlong Zhu, Yu Bo Chen, Jaka Sunarso, Wei Zhou, Zongping Shao
Perovskite oxide is an attractive low-cost alternative catalyst for oxygen evolution reaction (OER) relative to the precious metal oxide-based eletrocatalysts (IrO2 and RuO2). In this work, a series of Sr-doped La-based perovskite oxide catalysts with compositions of La1-xSrxFeO3-δ (x = 0, 0.2, 0.5, 0.8, and 1) are synthesized and characterized. The OER specific activities in alkaline solution increase in the order of LaFeO3-δ (LF), La0.8Sr0.2FeO3-δ (LSF-0.2), La0.5Sr0.5FeO3-δ (LSF-0.5), SrFeO3-δ (SF) and La0...
March 16, 2018: ACS Applied Materials & Interfaces
Daniel Rettenwander, Reinhard Wagner, Andreas Reyer, Maximilian Bonta, Lei Cheng, Marca M Doeff, Andreas Limbeck, Martin Wilkening, Georg Amthauer
The interface stability versus Li represents a major challenge in the development of next-generation all-solid-state batteries (ASSB), which take advantage of the inherently safe ceramic electrolytes. Cubic Li7 La3 Zr2 O12 garnets represent the most promising electrolytes for this technology. The high interfacial impedance versus Li is, however, still a bottleneck toward future devices. Herein, we studied the electrochemical performance of Fe3+ -stabilized Li7 La3 Zr2 O12 (LLZO:Fe) versus Li metal and found a very high total conductivity of 1...
February 22, 2018: Journal of Physical Chemistry. C, Nanomaterials and Interfaces
Jiangwei Wang, Yanming Wang, Wei Cai, Jixue Li, Ze Zhang, Scott X Mao
Shear band in metallic crystals is localized deformation with high dislocation density, which is often observed in nanopillar deformation experiments. The shear band dynamics coupled with dislocation activities, however, remains unclear. Here, we investigate the dynamic processes of dislocation and shear band in body-centered cubic (BCC) tungsten nanowires via an integrated approach of in situ nanomechanical testing and atomistic simulation. We find a strong effect of surface orientation on dislocation nucleation in tungsten nanowires, in which {111} surfaces act as favorite sites under high strain...
March 15, 2018: Scientific Reports
Morgane Dolhen, Masayuki Tanaka, Vincent Couderc, Sébastien Chenu, Gaëlle Delaizir, Tomokatsu Hayakawa, Julie Cornette, François Brisset, Maggy Colas, Philippe Thomas, Jean-René Duclère
We report on the laser emission of the polycrystalline ceramic obtained from the full and congruent crystallization of the parent glass 1Nd3+ :75TeO2 -12.5Bi2 O3 -12.5Nb2 O5 composition. In particular, the current work underlines the importance of carefully controlling the heat treatment in order to solely crystallize the Bi0.8 Nb0.8 Te2.4 O8 cubic phase and consequently avoid the formation of the BiNbTe2 O8 orthorhombic phase that would be detrimental for optical purpose. The structure, microstructure and photoluminescence properties of the resulting transparent tellurite ceramics are characterized...
March 15, 2018: Scientific Reports
Amarjeet Singh, Bhavana Sharma, Renu Deswal
In the present study, we report perhaps for the first time the use of novel varieties of Brassica oleracea var. botrytis and Raphanus sativus as potential bioreductant, to synthesize highly stable silver nanoparticles (AgNPs, no aggregation observed for six months), which is a significant finding as plant extract-directed AgNPs are intrinsically unstable and tend to aggregate. The reduction of Ag+ to Ag0 nanostructures was confirmed using UVVis spectroscopy showing SPR spectra at 400-435 nm. Nanosight and transmission electron microscope (TEM) analysis showed monodisperse spherical AgNPs (4-18 nm)...
May 2018: Journal of Trace Elements in Medicine and Biology
Yannick J Franzke, Nils Middendorf, Florian Weigend
We present an efficient algorithm for one- and two-component analytical energy gradients with respect to nuclear displacements in the exact two-component decoupling approach to the one-electron Dirac equation (X2C). Our approach is a generalization of the spin-free ansatz by Cheng and Gauss [J. Chem. Phys. 135, 084114 (2011)], where the perturbed one-electron Hamiltonian is calculated by solving a first-order response equation. Computational costs are drastically reduced by applying the diagonal local approximation to the unitary decoupling transformation (DLU) [D...
March 14, 2018: Journal of Chemical Physics
Jeffrey E Stokes
OBJECTIVES: Social relations can influence well-being throughout the life course. Integration in one's community may serve as a source of social support whereas negative interactions such as day-to-day discrimination can be psychosocial stressors, particularly for neurotic persons. Yet social connectedness may vary in importance across the age range. Individuals trim their social networks in later life to optimize emotional well-being, but older adults may also be at heightened risk of social isolation...
March 15, 2018: Aging & Mental Health
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"