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Corrosion resistance of investment casting samples of CF8 stainless steel in different passivation conditions

12-09-2013 | T. S. Pertile, E. J. Birriel, Materials and Corrosion, 2013

This study evaluated the corrosion performance of specimens of investment casting CF8 stainless steel, in different passivation conditions. The samples of a metallurgical industry were heat treated, blasted with steel grit, and surface treated with an aqueous solution used in the passivation ...

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Accessibility of Responsive End-Caps in Films Composed of Stimuli-Responsive, Depolymerizable Poly(phthalaldehydes)

12-09-2013 | Anthony M. DiLauro; Hua Zhang; Matthew S. Baker; Flory Wong; Ayusman Sen; Scott T. Phillips, Macromolecules, 2013

Polymers that are capable of depolymerizing completely from head-to-tail upon cleavage of an end-cap from the terminus of the polymer have emerged recently as a new strategy for creating stimuli-responsive solid-state materials with amplified responses. In theory, solid-state materials made from ...

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Energies, Vol. 6, Pages 4830-4840: Electrostatic Self-Assembly of Fe3O4 Nanoparticles on Graphene Oxides for High Capacity Lithium-Ion Battery Anodes

12-09-2013 | Yoon, Taegyune ; Kim, Jaegyeong ; Kim, Jinku ; Lee, Jung Kyoo, Energies, 2013

Magnetite, Fe3O4, is a promising anode material for lithium ion batteries due to its high theoretical capacity (924 mA h g−1), high density, low cost and low toxicity. However, its application as high capacity anodes is still hampered by poor cycling performance. To stabilize the cycling ...

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Electrostatic Control of Structure in Self‐Assembled Membranes

11-09-2013 | Ronit Bitton, Lesley W. Chow, R. Helen Zha, Yuri S. Velichko, E. Thomas Pashuck, Samuel I. Stupp, Small, 2013

Self‐assembling peptide amphiphiles (PAs) can form hierarchically ordered membranes when brought in contact with aqueous polyelectrolytes of the opposite charge by rapidly creating a diffusion barrier composed of filamentous nanostructures parallel to the plane of the incipient membrane. ...

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Chemical Speciation of Metal Complexes from Chemical Shift Calculations: The Interaction of 2-Amino-N-hydroxypropanamide with V(V) in Aqueous Solution

11-09-2013 | Hélio Anderson Duarte; Nina Vankova; Isabella Pires Ferreira; Eucler B. Paniago; Thomas Heine, Journal of Physical Chemistry B, 2013

The chemical speciation of 2-amino-N-hydroxypropanamide (β-alaninohydroxamic acid, HL) and vanadium (V) in aqueous solution has been investigated through calculations of the thermodynamic properties and the 51V nuclear magnetic resonance (NMR) chemical shifts of the species formed at equilibrium. ...

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Titration of Free Hydroxyl and Strained Siloxane Sites on Silicon Dioxide with Fluorescent Probes

11-09-2013 | Joseph M. McCrate; John G. Ekerdt, Langmuir, 2013

A technique enabling the detection and quantification of low density sites on planar SiO2 surfaces is demonstrated. Fluorescent probes are used to titrate free hydroxyl and strained siloxane sites on the surface of amorphous SiO2 substrates in vacuum. The titration of free hydroxyl sites was ...

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Study of factors affecting the results of natural water analyses by total reflection X‐ray fluorescence

10-09-2013 | G. V. Pashkova, A. G. Revenko, A. L. Finkelshtein, X-Ray Spectrometry, 2013

The study aims to choose the conditions for the direct analysis of different types of natural water samples by total reflection X‐Ray fluorescence spectrometry (TXRF). The effect of some factors on TXRF results was studied such as the surface density of dried water residue on the sample carrier, ...

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Efficient Near-UV Emitters Based on Cationic Bis-Pincer Iridium(III) Carbene Complexes

09-09-2013 | Noviyan Darmawan; Cheng-Han Yang; Matteo Mauro; Matthieu Raynal; Susanne Heun; Junyou Pan; Herwig Buchholz; Pierre B ..., Inorganic Chemistry, 2013

We report on the photophysical studies of two cationic near-UV emitters based on bis-pincer Ir(III) carbene complexes: [IrnBu(CNHCMeCCNHC)2]X, where IrnBu(CNHCMeCCNHC) is (4,6-dimethyl-1,3-phenylene-κC2)bis(1-butylimidazol-2-ylidene) and X = I– or PF6–). The compounds are highly emitting in ...

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Foam‐like polymer/clay aerogels which incorporate air bubbles

08-09-2013 | Rocco P. Viggiano, Matthew D. Gawryla, David A. Schiraldi, Journal of Applied Polymer Science, 2013

ABSTRACT The structure/property relationships of polymer/clay aerogels interfused with uniformly distributed air bubbles were examined. Through the incorporation of a polyelectrolyte in a montmorillonite(MMT) clay solution, the viscosity was systematically changed by the addition of ions with ...

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Neutral Six-Coordinate and Cationic Five-Coordinate Silicon(IV) Complexes with Two Bidentate Monoanionic N,S-Pyridine-2-thiolato(−) Ligands

06-09-2013 | Johannes A. Baus; Christian Burschka; Rüdiger Bertermann; Célia Fonseca Guerra; F. Matthias Bickelhaupt; Reinhold Tacke, Inorganic Chemistry, 2013

A series of neutral six-coordinate silicon(IV) complexes (4–11) with two bidentate monoanionic N,S-pyridine-2-thiolato ligands and two monodentate ligands R1 and R2 was synthesized (4, R1 = R2 = Cl; 5, R1 = Ph, R2 = Cl; 6, R1 = Ph, R2 = F; 7, R1 = Ph, R2 = Br; 8, R1 = Ph, R2 = N3; 9, R1 = Ph, R2 ...

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