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https://www.readbyqxmd.com/read/28631435/polar-intermetallics-pr5co2ge3-and-pr7co2ge4-with-planar-hydrocarbon-like-metal-clusters
#1
Qisheng Lin, Kaiser Aguirre, Scott M Saunders, Timothy A Hackett, Yong Liu, Valentin Taufour, Durga Paudyal, Sergey Budko, Paul C Canfield, Gordon J Miller
Planar hydrocarbon-like metal clusters may foster new insights linking organic molecules with conjugated - bonding interactions and inorganic structures in terms of their bonding characteristics. However, such clusters are uncommon in polar intermetallics. Herein, we report two polar intermetallic phases, Pr5Co2Ge3 and Pr7Co2Ge4, both of which feature such planar metal clusters, viz., ethylene-like [Co2Ge4] clusters plus the concatenated forms and polyacene-like [Co2Ge2]n ribbons in Pr5Co2Ge3, and 1,2,4,5-tetramethylbenzene-like [Co4Ge6] cluster in Pr7Co2Ge4...
June 19, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28630316/recombinant-silicateins-as-model-biocatalysts-in-organosiloxane-chemistry
#2
S Yasin Tabatabaei Dakhili, Stephanie A Caslin, Abayomi S Faponle, Peter Quayle, Sam P de Visser, Lu Shin Wong
The family of silicatein enzymes from marine sponges (phylum Porifera) is unique in nature for catalyzing the formation of inorganic silica structures, which the organisms incorporate into their skeleton. However, the synthesis of organosiloxanes catalyzed by these enzymes has thus far remained largely unexplored. To investigate the reactivity of these enzymes in relation to this important class of compounds, their catalysis of Si-O bond hydrolysis and condensation was investigated with a range of model organosilanols and silyl ethers...
June 19, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28623656/quantum-dots-as-components-of-electrochemical-sensing-platforms-for-the-detection-of-environmental-and-food-pollutants-a-review
#3
María Pedrero, Susana Campuzano, José M Pingarrón
The determination of organic and inorganic environmental and food pollutants is a key matter of concern in analytical chemistry due to their effects as a serious threat to human health. Focusing on this issue, several methodologies involving the use of nanostructured electrochemical platforms have been recently reported in the literature. Among these methods, those employing the use of quantum dots (QDs) stand out because of features such as signal amplification, good reproducibility and selectivity, and the possibility for multiplexed detection, and because they preserve the outstanding characteristics of electrochemical methodologies with respect to simplicity, ease-of-use, and cost-effective instrumentation...
June 16, 2017: Journal of AOAC International
https://www.readbyqxmd.com/read/28622649/influence-of-surface-chemistry-of-carbon-materials-on-their-interactions-with-inorganic-nitrogen-contaminants-in-soil-and-water
#4
REVIEW
Sumaraj, Lokesh P Padhye
Inorganic nitrogen contaminants (INC) (NH4(+), NO3(-), NO2(-), NH3, NO, NO2, and N2O) pose a growing risk to the environment, and their remediation methods are highly sought after. Application of carbon materials (CM), such as biochar and activated carbon, to remediate INC from agricultural fields and wastewater treatment plants has gained a significant interest since past few years. Understanding the role of surface chemistry of CM in adsorption of various INC is highly critical to increase adsorption efficiency as well as to assess the long term impact of using these highly recalcitrant CM for remediation of INC...
June 7, 2017: Chemosphere
https://www.readbyqxmd.com/read/28621537/electrochemical-deposition-of-conformal-and-functional-layers-on-high-aspect-ratio-silicon-micro-nanowires
#5
Tuncay Ozel, Benjamin A Zhang, Ruixuan Gao, Robert W Day, Charles M Lieber, Daniel G Nocera
Development of new synthetic methods for the modification of nanostructures has accelerated materials design advances to furnish complex architectures. Structures based on one-dimensional (1D) silicon (Si) structures synthesized using top-down and bottom-up methods are especially prominent for diverse applications in chemistry, physics, and medicine. Yet further elaboration of these structures with distinct metal-based and polymeric materials, which could open up new opportunities, has been difficult. We present a general electrochemical method for the deposition of conformal layers of various materials onto high aspect ratio Si micro- and nanowire arrays...
June 23, 2017: Nano Letters
https://www.readbyqxmd.com/read/28609102/mesoporous-titania-microspheres-with-highly-tunable-pores-as-an-anode-material-for-lithium-ion-batteries
#6
Michael G Fischer, Xiao Hua, Bodo D Wilts, Ilja Gunkel, Thomas Bennett, Ullrich Steiner
Mesoporous titania microspheres (MTM) have been employed in many applications including (photo-)catalysis as well as energy conversion and storage. Their morphology offers a hierarchical structural design motif that lends itself to being incorporated into established large-scale fabrication processes. Despite the fact that device performance hinges on the precise morphological characteristics of these materials, control over the detailed mesopore structure and the tunability of the pore size remains a challenge...
June 13, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28605154/addition-of-a-cyclophosphine-to-nitriles-an-inorganic-click-reaction-featuring-protio-organo-and-main-group-catalysis
#7
Saurabh Sunil Chitnis, Hazel A Sparkes, Vincent T Annibale, Natalie E Pridmore, Alex M Oliver, Ian Manners
We report the addition of a cyclotriphosphine to a broad range of nitriles giving access to the first examples of free 1-aza-2,3,4-triphospholenes in a rapid, ambient temperature, one-pot, high-yield protocol. The reaction produces electron-rich heterocycles (four lone pairs) and features homoatomic σ-bond heterolysis, thereby combining the key features of the 1,3-dipolar cycloaddition chemistry of azides and cyclopropanes. We also report the first catalytic addition of P-P bonds to the CN triple bond. The coordination chemistry of the new heterocycles is explored...
June 12, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28604901/flow-directed-synthesis-of-spatially-variant-arrays-of-branched-zinc-oxide-mesostructures
#8
Abhiteja Konda, Stephen A Morin
The use of fluid flow to control crystal morphology during the liquid-phase synthesis of inorganic nanomaterials is a relatively under explored approach. Synthetic strategies that take advantage of flow effects present the opportunity to tune several parameters (e.g., flow velocity and direction) in addition to conventional growth parameters (e.g., time, temperature, chemistry, and concentration), and thus enable additional levels of control in the bottom-up synthesis of nanomaterials. The current work reports the application of microfluidics to the rational synthesis of spatially variant arrays of branched zinc oxide (ZnO) nanorods with predictable morphological and compositional characteristics...
June 12, 2017: Nanoscale
https://www.readbyqxmd.com/read/28598477/revealing-the-slow-decomposition-kinetics-of-type-i-clathrate-ba8ga16ge30
#9
Hazel Reardon, Anders B Blichfeld, Hidetaka Kasai, Hao Yin, Espen Drath Bøjesen, Bo B Iversen
Inconsistencies in high temperature thermoelectric property measurements of Ba8Ga16Ge30 have prompted our study on the thermal stability of this heavily studied inorganic clathrate. Using X-ray diffraction, thermal analysis, and imaging techniques on both powder and spark plasma sintered pelletized samples, we probe the structure and decomposition characteristics of this important high temperature thermoelectric material. We demonstrate that the decomposition of Ba8Ga16Ge30 is extremely dependent on the heating conditions employed and, as a result of the slow decomposition kinetics of the clathrate, reveal that the true stability of this system has been overlooked in the extensive literature available...
June 21, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28598040/doing-the-research-that-informs-practice-a-retrospective-view-of-one-group-s-attempt-to-study-the-teaching-and-learning-of-organic-chemistry
#10
George M Bodner, Rob Ferguson, Selçuk Çalimsiz
The idea that the focus of educational research should be on results that can inform the practice of teaching has been an implicit assumption for so many years that one would be hard-pressed to trace it back to an individual source. At one time, the people doing such research in STEM disciplines were faculty in schools or colleges of education who focused on K-12 classrooms and looked for ideas, concepts, and principles that would be valid across a range of STEM disciplines. Eventually, this research was done on college- or university-level students, as well, and there was a shift toward what has been called discipline-based educational research (DBER) that looks at the problems associated with the teaching and learning of a given discipline, such as chemistry...
June 9, 2017: Chemistry, An Asian Journal
https://www.readbyqxmd.com/read/28596987/biodegradable-polyphosphazene-based-blends-for-regenerative-engineering
#11
Kenneth S Ogueri, Jorge L Escobar Ivirico, Lakshmi S Nair, Harry R Allcock, Cato T Laurencin
The occurrence of musculoskeletal tissue injury or disease and the subsequent functional impairment is at an alarming rate. It continues to be one of the most challenging problems in the human health care. Regenerative engineering offers a promising transdisciplinary strategy for tissues regeneration based on the convergence of tissue engineering, advanced materials science, stem cell science, developmental biology and clinical translation. Biomaterials are emerging as extracellular-mimicking matrices designed to provide instructive cues to control cell behavior and ultimately, be applied as therapies to regenerate damaged tissues...
March 2017: Regenerative Engineering and Translational Medicine
https://www.readbyqxmd.com/read/28595564/electric-field-oriented-growth-of-long-hair-like-silica-microfibrils-and-derived-functional-monolithic-solids
#12
Michael Z Hu, David W DePaoli, Tanya Kuritz, Ogbemi O Omatete
We present a "bottom-up" fabrication approach to first grow a new class of inorganic (silica) long hair-like microfibrils or microwires and then to form monolithic solid pellet that contains parallel arrays of bundled microfibrils with a controlled orientation. During the sol-gel solution processing, reactive precursor species are utilized as molecular "building blocks" for the field-directed assembly growth of microfibrils driven by an electric field of pulsed direct current (dc) with controlled frequency...
April 20, 2017: Recent Patents on Nanotechnology
https://www.readbyqxmd.com/read/28594436/the-first-step-of-the-oxidation-of-elemental-sulfur-crystal-structure-of-the-homopolyatomic-sulfur-radical-cation-s8
#13
Janis Derendorf, Carsten Jenne, Mathias Keßler
The oxidation of elemental sulfur in superacidic solutions and melts is one of the oldest topics in inorganic main group chemistry. Thus far, only three homopolyatomic sulfur cations ([S4 ](2+) , [S8 ](2+) , and [S19 ](2+) ) have been characterized crystallographically although ESR investigations have given evidence for the presence of at least two additional homopolyatomic sulfur radical cations in solution. Herein, the crystal structure of the hitherto unknown homopolyatomic sulfur radical cation [S8 ](.+) is presented...
June 8, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28594160/spontaneous-pt-deposition-on-defective-surfaces-of-in2o3-nanocrystals-confined-within-cavities-of-hollow-silica-nanoshells-pt-catalyst-modified-ito-electrode-with-enhanced-ecl-performance
#14
Young Shin Cho, Soo Min Kim, Youngwon Ju, Junghoon Kim, Ki-Wan Jeon, Seung Hwan Cho, Joohoon Kim, In Su Lee
Although the deposition of metallic domains on a preformed semiconductor nanocrystal provides an effective pathway to access diverse hybrid nanocrystals with synergistic metal/semiconductor heterojunction interface, those reactions that take place on the surface of semiconductor nanoscrystals have not been investigated thoroughly, because of the impediments caused by the surface-capping organic surfactants. By exploiting the interfacial reactions occurring between the solution and nanoparticles confined with the cavities of hollow nanoparticles, we propose a novel nanospace-confined strategy for assessing the innate reactivity of surfaces of inorganic semiconductor nanoparticles...
June 21, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28593963/accelerated-discovery-of-two-crystal-structure-types-in-a-complex-inorganic-phase-field
#15
C Collins, M S Dyer, M J Pitcher, G F S Whitehead, M Zanella, P Mandal, J B Claridge, G R Darling, M J Rosseinsky
The discovery of new materials is hampered by the lack of efficient approaches to the exploration of both the large number of possible elemental compositions for such materials, and of the candidate structures at each composition. For example, the discovery of inorganic extended solid structures has relied on knowledge of crystal chemistry coupled with time-consuming materials synthesis with systematically varied elemental ratios. Computational methods have been developed to guide synthesis by predicting structures at specific compositions and predicting compositions for known crystal structures, with notable successes...
June 7, 2017: Nature
https://www.readbyqxmd.com/read/28593736/usefulness-of-the-%C3%AF-aromaticity-and-%C3%AF-antiaromaticity-concepts-for-clusters-and-solid-state-compounds
#16
Alexander I Boldyrev, Ivan A Popov, Alyona A Starikova, Dmitry V Steglenko
In this review we present examples of clusters, molecules, and solid-state compounds, for which the use of σ-aromaticity and σ-antiaromaticity concepts is essential for understanding of chemical bonding. We show that the bonding patterns in these σ-aromatic and σ-antiaromatic compounds are similar to those of the corresponding π-aromatic and π-antiaromatic chemical systems, respectively. Undoubtedly, σ-aromaticity helps us understand why the high symmetry isomers are the most stable among myriads of other potential structures...
June 7, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28578232/the-comparison-of-se-iv-and-se-vi-sequestration-by-nanoscale-zero-valent-iron-in-aqueous-solutions-the-roles-of-solution-chemistry
#17
Yankai Xie, Haoran Dong, Guangming Zeng, Lihua Zhang, Yujun Cheng, Kunjie Hou, Zhao Jiang, Cong Zhang, Junmin Deng
The sequestration of Se(IV) and Se(VI) by nanoscale zero-valent iron (NZVI) particles were compared under different solution conditions. Firstly, the comparison was conducted at three pH values (4.0, 6.0 and 8.0) in deionized water. Generally, the removal of Se(IV)/Se(VI) by NZVI was more rapid under acidic conditions and the removal efficiency of Se(IV) was much higher than that of Se(VI). Moreover, the pH variation exhibited much larger influence on the sequestration of Se(VI) than that of Se(IV) by NZVI...
May 29, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28577166/8th-asian-biological-inorganic-chemistry-conference
#18
EDITORIAL
Christian G Hartinger
No abstract text is available yet for this article.
June 2, 2017: Journal of Biological Inorganic Chemistry: JBIC
https://www.readbyqxmd.com/read/28570048/aerosol-mass-spectrometer-for-simultaneous-detection-of-polyaromatic-hydrocarbons-and-inorganic-components-from-individual-particles
#19
Johannes Passig, Julian Schade, Markus Oster, Matthias Fuchs, Sven Ehlert, Cornelia Jäger, Martin Sklorz, Ralf Zimmermann
Online studies of single airborne particles represent a demanding challenge in aerosol chemistry. New technologies that help to unravel the role of ambient aerosols in earth climate and to assess local and specific health risks from air pollution are highly desired. Of particular relevance are polycyclic aromatic hydrocarbons (PAHs) from combustion processes that are associated with both acute and long-term health effects. Usually, online single particle analyses apply laser desorption/ionization (LDI) in a bipolar mass spectrometer, revealing elemental constituents and limited molecular information by detection of both positive and negative ions...
June 9, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28564625/dynamics-of-inorganic-components-in-lake-waters-from-terra-nova-bay-antarctica
#20
E Conca, M Malandrino, A Giacomino, S Buoso, S Berto, P L Verplanck, E Magi, O Abollino
Water and Suspended Particulate Material (SPM) samples analysed in this work were collected in the austral summer 2011/12 from six shallow Antarctic lakes (Carezza, Edmonson Point 14 and 15a, Gondwana, Inexpressible Island 10b and Tarn Flat 20) of Terra Nova Bay (Northern Victoria Land, Antarctica). The total concentrations of a large suite of inorganic analytes were determined, in order to gain insight into the natural processes regulating species distribution, define natural background values and detect possible present or future local and/or global anthropogenic contamination...
May 20, 2017: Chemosphere
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