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Effect of fiber size on structural and tensile properties of electrospun polyvinylidene fluoride fibers

18-10-2014 | Avinash Baji, Yiu‐Wing Mai, Shing‐Chung Wong, Polymer Engineering and Science, 2014

We use electrospinning to obtain polyvinylidene fluoride (PVDF) fibers and demonstrate simultaneous improvements in β‐crystal microstructure and in tensile properties of fibers with reduction of their diameter. PVDF fibers with average diameters ranging from 70 to 400 nm are obtained by ...

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A Molecular Copper Catalyst for Electrochemical Water Reduction with a Large Hydrogen‐Generation Rate Constant in Aqueous Solution

14-10-2014 | Peili Zhang, Mei Wang, Yong Yang, Tianyi Yao, Licheng Sun, Angewandte Chemie International Edition, 2014

Abstract The copper complex [(bztpen)Cu](BF4)2 (bztpen=N‐benzyl‐N,N′,N′‐tris(pyridin‐2‐ylmethyl)ethylenediamine) displays high catalytic activity for electrochemical proton reduction in acidic aqueous solutions, with a calculated hydrogen‐generation rate constant (kobs) of over 10000 s−1. A ...

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Stability Domains of NbC and Nb(CN) During Carbothermal Reduction of Niobium Oxide

08-10-2014 | Hanjung Kwon, Wonbaek Kim, Jiwoong Kim, Journal of the American Ceramic Society, 2014

The Gibbs free energies of formation of Nb(CO) and Nb(CN) were calculated using ab initio simulation. Phase stability diagrams of the Nb2O5–NbO2–Nb(CO)–NbC/Nb(CN) system were constructed with respect to carbon activity, oxygen pressure, and the characteristics of solution formation. The ...

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Dynamic Behavior, Electrochromism, and Two-Photon Absorption of Dicyanomethylenated Quinacridone

08-10-2014 | Takashi Takeda; Hiroyuki Sugihara; Yasutaka Suzuki; Jun Kawamata; Tomoyuki Akutagawa, The Journal of Organic Chemistry, 2014

Molecular structures of dicyanomethylenated quinacridone (1) as a solid and in solution were examined on the basis of single-crystal X-ray structural analysis, temperature-dependent 1H NMR in CD2Cl2, and theoretical calculations. Crystal 1 had a curved, butterfly-shaped molecular structure. ...

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On the origin of coercivity reduction in surface patterned magnetic thin films

07-10-2014 | Goran Rasic, Justin Schwartz, physica status solidi (a), 2014

Spinel nickel ferrite (NiFe2O4) is a promising material for next generation high‐frequency sensors, antennae and microwave devices. A key issue to be addressed is the magnetic loss, which is proportional to frequency and becomes substantial at frequencies above 1 GHz. Previously, we reported on ...

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Multi‐Electron Oxygen Reduction by a Hybrid Visible‐Light‐Photocatalyst Consisting of Metal‐Oxide Semiconductor and Self‐Assembled Biomimetic Complex

07-10-2014 | Shin‐ichi Naya, Tadahiro Niwa, Ryo Negishi, Hisayoshi Kobayashi, Hiroaki Tada, Angewandte Chemie International Edition, 2014

Abstract Adsorption experiments and density functional theory (DFT) simulations indicated that Cu(acac)2 is chemisorbed on the monoclinic sheelite (ms)‐BiVO4 surface to form an O2‐bridged binuclear complex (OBBC/BiVO4) like hemocyanin. Multi‐electron reduction of O2 is induced by the ...

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Generalized Titarenko's algorithm for ring artefacts reduction

06-10-2014 | E. X. Miqueles, J. Rinkel, F. O'Dowd, J. S. V Bermúdez, Journal of Synchrotron Radiation, 2014

A fast algorithm for ring artefact reduction in high‐resolution micro‐tomography with synchrotron radiation is presented. The new method is a generalization of the one proposed by Titarenko and collaborators, with a complete sinogram restoration prior to reconstruction with classical algorithms. ...

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Mechanical reinforcement of hydrogels by nanofiber network undergoing biaxial deformation

03-10-2014 | Yuanhao Guo, Jason Drum, Cheng Qu, Miko Cakmak, Polymer Composites, 2014

Hydrogels can encapsulate large quantities of water within a three‐dimensional cross‐linked polymer network. Polyvinyl alcohol (PVA) hydrogels have been widely used in tissue engineering, wound dressing, and drug delivery. However, the inferior mechanical properties of PVA hydrogels limit their ...

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Molecular Co(II) and Co(III) Heteroarylalkenolates as Efficient Precursors for Chemical Vapor Deposition of Co3O4 Nanowires

02-10-2014 | Mehtap Büyükyazi; Corinna Hegemann; Thomas Lehnen; Wieland Tyrra; Sanjay Mathur, Inorganic Chemistry, 2014

Two new cobalt precursors, CoII(PyCHCOCF3)2(DMAP)2 (1) and CoIII(PyCHCOCF3)3 (2), based on Co(II) and Co(III) centers were synthesized using a redox active ligand system. The different chemical configurations of 1 and 2 and differential valence states of cobalt were confirmed by crystal structure ...

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Spectroscopic analysis and catalytic application of biopolymer capped silver nanoparticle, an effective antimicrobial agent

01-10-2014 | Nilkamal Pramanik, Aditi Bhattacharyya, Patit Paban Kundu, Journal of Applied Polymer Science, 2014

ABSTRACT Microbial reduction of silver ion (conc. 1 mM AgNO3) was performed by Alkaliphilus oremlandii strain ohILAs in an alkaline pH 10. The synthesized silver nanoparticle was stabilized by poly(3‐hydroxybutyrate‐co‐3‐hydroxyvalerate) biopolymer which was also synthesized by the microbial ...

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