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Magnetically Aligned Supramolecular Hydrogels

24-10-2014 | Matthew Wallace, Andre Zamith Cardoso, William J. Frith, Jonathan A. Iggo, Dave J. Adams, Chemistry - A European Journal, 2014

Abstract The magnetic‐field‐induced alignment of the fibrillar structures present in an aqueous solution of a dipeptide gelator, and the subsequent retention of this alignment upon transformation to a hydrogel upon the addition of CaCl2 or upon a reduction in solution pH is reported. Utilising ...


Cr(VI) Reduction and Cr(III) Immobilization by Acinetobacter sp. HK-1 with the Assistance of a Novel Quinone/Graphene Oxide Composite

23-10-2014 | Hai-Kun Zhang; Hong Lu; Jing Wang; Ji-Ti Zhou; Meng Sui, Environmental Science & Technology, 2014

Cr(VI) biotreatment has attracted a substantial amount of interest due to its cost effectiveness and environmental friendliness. However, the slow Cr(VI) bioreduction rate and the formed organo-Cr(III) in solution are bottlenecks for biotechnology application. In this study, a novel strain, ...


Can Lowering the Injection Brine Salinity Further Increase Oil Recovery by Surfactant Injection under Otherwise Similar Conditions?

23-10-2014 | Annette Meland Johannessen; Kristine Spildo, Energy & Fuels, 2014

It is well-established that injecting water with significantly lower salinity than the formation water salinity may give increased oil recovery. Although less well studied, the observed low-salinity effect has drawn attention to possible benefits from combining low-salinity water with traditional ...


Amphoteric hydrolyzed Poly(acrylamide/dimethyl diallyl ammonium chloride) as a filtration reducer under high temperatures and high salinities

21-10-2014 | Ling Lin, Pingya Luo, Journal of Applied Polymer Science, 2014

ABSTRACT Poly(acrylamide/dimethyl diallyl ammonium chloride) (PAD) samples were synthesized via solution polymerization. Hydrolyzed poly(acrylamide/dimethyl diallyl ammonium chloride) (HPAD) was prepared with NaOH as a hydrolyzation agent. Both PAD and HPAD were characterized by IR and NMR ...


Proton and Electron Transfer Mechanisms in the Formation of Neutral and Charged Quinhydrone-Like Complexes: A Multilayered Computational Study

21-10-2014 | Vincenzo Barone; Ivo Cacelli; Alessandro Ferretti; Giacomo Prampolini; Giovanni Villani, Journal of Chemical Theory and Computation, 2014

The redox and proton transfer processes involving the several dimers arising from quinones are studied by quantum mechanical methods using second order perturbation theory (MP2) and a medium size basis set optimized for reproducing dispersion interactions. Furthermore, bulk solvent effects are ...


Energies, Vol. 7, Pages 6741-6764: Assessment of Energy, Environmental and Economic Performance of a Solar Desiccant Cooling System with Different Collector Types

20-10-2014 | Angrisani, Giovanni ; Roselli, Carlo ; Sasso, Maurizio ; Tariello, Francesco, Energies, 2014

Desiccant-based air handling units can achieve reductions in greenhouse gas emissions and energy savings with respect to conventional air conditioning systems. Benefits are maximized when they interact with renewable energy technologies, such as solar collectors. In this work, experimental tests ...


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 ...


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 ...


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 ...


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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