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Water Freezing as a Regiocontrol Element in the Multicomponent Assembly of Cyclic Enones

21-11-2014 | Raquel De la Campa, Josefa Flórez, Chemistry - A European Journal, 2014

Abstract Regioselective synthesis of dialkoxy 2‐cyclopentenones and 2‐cyclohexenones with novel substitution patterns has been accomplished by the one‐pot combination of three simple starting materials (chromium carbene complex, Weinreb acetamide lithium enolate and 1‐alkoxyallenyllithium) ...

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Improving the performance of fluoroprotein foam in extinguishing gasoline pool fires with addition of bromofluoropropene

20-11-2014 | Mei Zhao, Xiaomin Ni, Shaogang Zhang, Wei Cao, Yu Guan, Canjun Liang, Xishi Wang, Heping Zhang, Fire and Materials, 2014

SUMMARY The fluoroprotein foam is one of the most widely used fire suppressants for its low cost, low toxicity and biodegradability. However, its fire extinguishing performance is limited. In this article, fluoroprotein foam was combined with a clean and degradable fire suppressant of ...

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Synthesis of a Stable Selenoaldehyde by Self‐Catalyzed Thermal Dehydration of a Primary‐Alkyl‐Substituted Selenenic Acid

19-11-2014 | Shohei Sase, Ryo Kakimoto, Kei Goto, Angewandte Chemie International Edition, 2014

Abstract The unprecedented dehydration of a selenenic acid (RCH2SeOH) to a selenoaldehyde (RCHSe) has been demonstrated. A primary‐alkyl‐substituted selenenic acid was synthesized for the first time by taking advantage of a bulky cavity‐shaped substituent. Upon heating in solution, the ...

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Ion current rectification effect of porous graphene membrane

19-11-2014 | Jian Zeng, Huijun Yao, Dan Mo, Jinglai Duan, Jiande Liu, Dianliang Cao, Pengfei Zhai, Jie Liu, Youmei Sun, physica status solidi (c), 2014

Abstract Graphene, as an important ideal two‐dimensional material, is driving more and more attention because of its unique mechanical strength and chemical stability. In this work, the rectification effect of nanopores in graphene/PET structure at different KCl concentration is investigated. ...

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Eliminating the Trade‐Off between the Throughput and Pattern Quality of Sub‐15 nm Directed Self‐Assembly via Warm Solvent Annealing

19-11-2014 | Jong Min Kim, YongJoo Kim, Woon Ik Park, Yoon Hyung Hur, Jae Won Jeong, Dong Min Sim, Kwang Min Baek, Jung Hye Lee, ..., Advanced Functional Materials, 2014

The directed self‐assembly (DSA) of block copolymers (BCPs) has been suggested as a promising nanofabrication solution. However, further improvements of both the pattern quality and manufacturability remain as critical challenges. Although the use of BCPs with a high Flory‐Huggins interaction ...

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Selective detection of Al3+ and citric acid with a fluorescent amphiphile

19-11-2014 | Ziya Köstereli; Kay Severin, Organic & Biomolecular Chemistry, 2014

An amphiphilic fluorescent dye with a disulfonated BODIPY head group and a heptadecyl side chain is described. In buffered aqueous solution, the amphiphile can form aggregates with a critical micelle concentration of [[similar]] 20 μM. The aggregation of the dye is associated with a strong ...

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Mild Solution Synthesis of Graphene Loaded with LiFePO4-C Nanoplatelets for High Performance Lithium Ion Batteries

19-11-2014 | Muchun Liu; Yan Zhao; Sen Gao; Yan Wang; Yuexin Duan; Xiao Han; Qi Dong, New Journal of Chemistry, 2014

To reduce the reaction time, electric energy consumption, and free from high pressure as well as unsafe condition, we developed an easy and efficient method for synthesis of LiFePO4/graphene/C composite. The cathode material was in situ fabricated in an open system by microwave-assisted solvent ...

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Electrocatalytic upgrading of model lignin monomers with earth abundant metal electrodes

19-11-2014 | Chun Ho Lam; Christy B. Lowe; Zhenglong Li; Kelsey N. Longe; Jordan T. Rayburn; Michael A. Caldwell; Carly E. Houdek ..., Green Chemistry, 2014

Guaiacol (2-methoxyphenol) and related lignin model monomers undergo electrocatalytic hydrogenolysis/hydrogenation (ECH) to cyclohexanol with RANEY® Nickel electrodes in aqueous solution. Aryl ether (C–O) bond cleavage is followed by reduction of the aromatic ring at ambient pressure and 75 °C. ...

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Cd(II)-Terpyridine-based complex as a ratiometric fluorescent probe for pyrophosphate detection in solution and as an imaging agent in living cells

19-11-2014 | Xiao-Qi Yu; Shu-Yan Jiao; Kun Li; Wei Zhang; Yan-Hong Liu; Zeng Huang, Dalton Transactions, 2014

The terpyridine antracene ligand L1 was synthesized and characterized. L1 is a ratiometric fluorescent probe for Cd2+ with a recognition mechanism based on intramolecular charge transfer (ICT). An L1-Cd(II) complex was isolated, and its structure was established by single-crystal XRD. The ...

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Thermal property, morphology, and hydrolysis ability of poly(lactic acid)/chitosan nanocomposites using polyethylene oxide

18-11-2014 | Nguyen Thuy Chinh, Nguyen Thi Thu Trang, Dinh Thi Mai Thanh, To Thi Xuan Hang, Nguyen Vu Giang, Pham Minh Quan, Nguy ..., Journal of Applied Polymer Science, 2014

ABSTRACT Poly(lactic acid) (PLA) and chitosan (CS) are two natural resource polymers, which have been applied widely into different fields. Polymer composites based on PLA and CS have some advantages such as good adhesion, biodegradability, biocompatibility, and high stability. They can be ...

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