bluuebunny/crossref_metadata_2025 huggingface dataset:
Efficient and selective copper-catalyzed organic solvent-free and biphasic oxidation of aromatic gem-disubstituted alkenes to carbonyl compounds by tert-butyl hydroperoxide at room temperature
Authors: Hossain Md. Munkir , Huang Wei-Kai , Chen Hung-Jie , Wang Pei-Han , Shyu Shin-Guang
Published: May 2014

Biphasic Cu(ii) catalyzed selective oxidative cleavage of aromatic gem-disubstituted alkenes to carbonyl compounds using tert-butyl hydroperoxide at room temperature.
Self-assembly of a neutral platinum(ii) complex into highly emitting microcrystalline fibers through metallophilic interactions
Authors: Mauro Matteo , Aliprandi Alessandro , Cebrián Cristina , Wang Di , Kübel Christian , De Cola Luisa
Published: May 2014

The solvent-assisted self-assembly of a blue-emitting neutral platinum(ii) complex into micrometer-long and highly crystalline fibers has been achieved.
A polymer-based ratiometric intracellular glucose sensor
Authors: Zhang Liqiang , Su Fengyu , Buizer Sean , Kong Xiangxing , Lee Fred , Day Kevin , Tian Yanqing , Meldrum Deirdre R.
Published: May 2014

A new polymeric ratiometric glucose sensor was synthesized and used for dynamically monitoring intracellular glucose concentrations in HeLa cells.
Development of a new colorimetric and red-emitting fluorescent dual probe for G-quadruplex nucleic acids
Authors: Yan Jin-Wu , Chen Shuo-Bin , Liu Hui-Yun , Ye Wen-Jie , Ou Tian-Miao , Tan Jia-Heng , Li Ding , Gu Lian-Quan , Huang Zhi-Shu
Published: May 2014

A tailor-made colorimetric and red-emitting fluorescent dual probe was developed for the easy detection of G-quadruplexes.
Template-free synthesis of beta zeolite membranes on porous α-Al2O3 supports
Authors: Tang Yanting , Liu Xiufeng , Nai Shifeng , Zhang Baoquan
Published: May 2014

The preferentially (h0l)-oriented beta zeolite membrane was prepared on the porous α-Al2O3 support by secondary growth of a beta seed layer in the absence of organic templates.
Flexible patterned micro-electrochemical capacitors based on PEDOT
Authors: Fan Lishuang , Zhang Naiqing , Sun Kening
Published: May 2014

We reported fabrication of patterned flexible MECs using inkjet printing. The obtained flexible MECs exhibited a very high specific capacitance of 6.4 mF cm−2, and revealed long-term cycling stability.
A size amplified immune magnetic microbeads strategy in the rapid detection of circulating tumor cells
Authors: Zhang Hongyan , Wang Yanhong , Li Qingling , Zhang Fumiao , Tang Bo
Published: May 2014

A size amplified immune magnetic microbeads strategy for the combined use of membrane filtration and immune-magnetic separation in CTC detection.
Contamination-free solutions of selenium in amines for nanoparticle synthesis
Authors: Walker B. C. , Agrawal R.
Published: May 2014

Selenium is solubilized in only amine through the addition and subsequent removal of a volatile thiol to produce pure selenide nanoparticles.
π-Extended tetrathiafulvalene BODIPY (ex-TTF-BODIPY): a redox switched “on–off–on” electrochromic system with two near-infrared fluorescent outputs
Authors: Bill Nathan L. , Lim Jong Min , Davis Christina M. , Bähring Steffen , Jeppesen Jan O. , Kim Dongho , Sessler Jonathan L.
Published: May 2014

Ex-TTF-BODIPY functions as a near-IR electrochromic and electrofluorochromic switch, displaying redox controlled “on–off–on” emission features.
A semimetal bismuth element as a direct plasmonic photocatalyst
Authors: Dong Fan , Xiong Ting , Sun Yanjuan , Zhao Zaiwang , Zhou Ying , Feng Xin , Wu Zhongbiao
Published: May 2014

A semimetal bismuth element exhibited admirable photocatalytic activity towards the removal of NO in air, and most strikingly, showed a catalytic “memory” capability, resulting from the surface plasmon resonance mediated direct photocatalysis.
The enhanced photoelectrochemical performance of CdS quantum dots sensitized TiO2 nanotube/nanowire/nanoparticle arrays hybrid nanostructures
Authors: Lv Pin , Yang Haibin , Fu Wuyou , Sun Hairui , Zhang Wenjiao , Li Meijing , Yao Huizhen , Chen Yanli , Mu Yannan , Yang Lihua , Ma Jinwen , Sun Meiling , Li Qian , Su Shi
Published: May 2014

This study aims at improving the photoelectrochemical performance mainly from two aspects: the increased number of heterojunctions and the advantages of nanotube/nanowire/nanoparticle arrays hybrid nanostructures.
Fluorinated mixed valence Fe(ii)–Fe(iii) phosphites with channels templated by linear tetramine chains. Structural and magnetic implications of partial replacement of Fe(ii) by Co(ii)
Authors: Orive Joseba , Fernández de Luis Roberto , Rodríguez Fernández Jesús , Legarra Estibaliz , Plazaola Fernando , Arriortua María I.
Published: May 2014

Three novel 3D open-framework fluorinated mixed valence Fe(ii)–Fe(iii) phosphites with channels templated by protonated tetramine chains were synthesized.
The nature of the C–Cl⋯Cl–C intermolecular interactions found in molecular crystals: a general theoretical-database study covering the 2.75–4.0 Å range
Authors: Capdevila-Cortada Marçal , Castelló Júlia , Novoa Juan J.
Published: May 2014

An exhaustive study of the nature of the C–Cl⋯Cl–C interactions found in crystals has been carried out at the MP2/aug-cc-pVDZ level using model dimers and a set of 45 dimers with Cl⋯Cl distances in the 2.75–4 Å range.
Computer simulation studies on passive recruitment dynamics of lipids induced by the adsorption of charged nanoparticles
Authors: Li Yang
Published: May 2014

The recruitment dynamics of lipids in the biomembrane is believed to play an important role in a variety of cellular processes. (a) flip-flops, (b) lateral diffusion, (c) nanoscale domain, (d) protrusions.
Solid-state emission enhancement in vaulted trans-bis(salicylaldiminato)platinum(ii) crystals with halogen functionality
Authors: Komiya Naruyoshi , Okada Minoru , Fukumoto Kanako , Iwata Shotaro , Naota Takeshi
Published: May 2014

Chloro-substitution significantly increases the lower heat resistance of short-vaulted, non-substitutedtrans-bis(salicylaldiminato)Pt(ii) complex crystals, and maintains the intense emission of long-vaulted analogues, which leads to intense solid-state emission with low structural dependence.
Transition metal complexes with oligopeptides: single crystals and crystal structures
Authors: Lillo Vanesa , Galán-Mascarós José Ramón
Published: May 2014

The crystal structures of metal complexes with oligopeptides are reviewed, highlighting crystallization strategies and the main binding modes.
Reduced graphene oxide/Ni1−xCoxAl-layered double hydroxide composites: preparation and high supercapacitor performance
Authors: Xu Jie , Gai Shili , He Fei , Niu Na , Gao Peng , Chen Yujin , Yang Piaoping
Published: May 2014

A novel sandwich-structured rGO/Ni0.83Co0.17Al-LDH hybrid composite exhibits high supercapacitor performance, with a specific capacitance of 1902 F g−1 at 1 A g−1, and excellent cycling stability.
α-Borylcarbonyl compounds: from transient intermediates to robust building blocks
Authors: He Zhi , Zajdlik Adam , Yudin Andrei K.
Published: May 2014

Various aspects of α-borylcarbonyl chemistry are discussed including transient intermediate detection, stable molecule preparation, and their applications in organic synthesis.
Evidence of cationic mixing and ordering in the honeycomb layer of Li4MSbO6 (M(iii) = Cr, Mn, Al, Ga) (S.G. C2/c) oxides
Authors: Bhardwaj Neha , Gupta Akanksha , Uma S.
Published: May 2014

We report the synthesis of the rock salt derived structures of Li4MSbO6 (M(iii) = Cr, Mn, Al, Ga) oxides.
Doping cobalt into a [Zn7] cluster-based MOF to tune magnetic behaviour and induce fluorescence signal mutation
Authors: Li Yun-Wu , Liu Sui-Jun , Hu Tong-Liang , Bu Xian-He
Published: May 2014

An in situ doping strategy was successfully applied to tune the magnetic behaviour and induce fluorescence signal mutation of a spindle heptanuclear zinc cluster-based MOF, which led to a new CoII-doped ZnII-MTV-M′MOF with canted antiferromagnetism and weaker fluorescence emissions.
Photothermal release of CO2 from capture solutions using nanoparticles
Authors: Nguyen Du T. , Truong Richard , Lee Richard , Goetz Samantha A. , Esser-Kahn Aaron P.
Published: May 2014

We report the use of actinic light for the photo-thermal enhanced regeneration of CO2 from capture solutions containing nanoparticles. Regeneration efficiency increased with higher nanoparticle concentrations and initial solution temperatures.
Capturing interfacial photoelectrochemical dynamics with picosecond time-resolved X-ray photoelectron spectroscopy
Authors: Neppl Stefan , Shavorskiy Andrey , Zegkinoglou Ioannis , Fraund Matthew , Slaughter Daniel S. , Troy Tyler , Ziemkiewicz Michael P. , Ahmed Musahid , Gul Sheraz , Rude Bruce , Zhang Jin Z. , Tremsin Anton S. , Glans Per-Anders , Liu Yi-Sheng , Wu Cheng Hao , Guo Jinghua , Salmeron Miquel , Bluhm Hendrik , Gessner Oliver
Published: May 2014

Time-resolved core-level spectroscopy using laser pulses to initiate and short X-ray pulses to trace photoinduced processes has the unique potential to provide electronic state- and atomic site-specific insight into fundamental electron dynamics in complex systems. Time-domain studies using transient X-ray absorption and emission techniques have proven extremely valuable to investigate electronic and structural dynamics in isolated and solvated molecules. Here, we describe the implementation of a picosecond time-resolved X-ray photoelectron spectroscopy (TRXPS) technique at the Advanced Light Source (ALS) and its application to monitor photoinduced electron dynamics at the technologically pertinent interface formed by N3 dye molecules anchored to nanoporous ZnO. Indications for a dynamical chemical shift of the Ru3d photoemission line originating from the N3 metal centre are observed ∼30 ps after resonant HOMO–LUMO excitation with a visible laser pump pulse. The transient changes in the TRXPS spectra are accompanied by a characteristic surface photovoltage (SPV) response of the ZnO substrate on a pico- to nanosecond time scale. The interplay between the two phenomena is discussed in the context of possible electronic relaxation and recombination pathways that lead to the neutralisation of the transiently oxidised dye after ultrafast electron injection. A detailed account of the experimental technique is given including an analysis of the chemical modification of the nano-structured ZnO substrate during extended periods of solution-based dye sensitisation and its relevance for studies using surface-sensitive spectroscopy techniques.
Ionic liquid based EDLCs: influence of carbon porosity on electrochemical performance
Authors: Noofeli Asa , Hall Peter J. , Rennie Anthony J. R.
Published: May 2014

Electrochemical double layer capacitors (EDLCs) are a category of supercapacitors; devices that store charge at the interface between electrodes and an electrolyte. Currently available commercial devices have a limited operating potential that restricts their energy and power densities. Ionic liquids (ILs) are a promising alternative electrolyte as they generally exhibit greater electrochemical stabilities and lower volatility. This work investigates the electrochemical performance of EDLCs using ILs that combine the bis(trifluoromethanesulfonyl)imide anion with sulfonium and ammonium based cations. Different activated carbon materials were employed to also investigate the influence of varying pore size on electrochemical performance. Electrochemical impedance spectroscopy (EIS) and constant current cycling at different rates were used to assess resistance and specific capacitance. In general, greater specific capacitances and lower resistances were found with the sulfonium based ILs studied, and this was attributed to their smaller cation volume. Comparing electrochemical stabilities indicated that significantly higher operating potentials are possible with the ammonium based ILs. The marginally smaller sulfonium cation performed better with the carbon exhibiting the largest pore width, whereas peak performance of the larger sulfonium cation was associated with a narrower pore size. Considerable differences between the performance of the ammonium based ILs were observed and attributed to differences not only in cation size but also due to the inclusion of a methoxyethyl group. The improved performance of the ether bond containing IL was ascribed to electron donation from the oxygen atom influencing the charge density of the cation and facilitating cation–cation interactions.
Reduced graphene oxide anchoring CoFe2O4 nanoparticles as an effective catalyst for non-aqueous lithium–oxygen batteries
Authors: Cao Yong , Cai Sen-Rong , Fan Shao-Cong , Hu Wei-Qiang , Zheng Ming-Sen , Dong Quan-Feng
Published: May 2014

CoFe2O4 nanoparticles were uniformly anchored on reduced graphene oxide by a facile solvothermal method. The obtained CoFe2O4/reduced graphene oxide (CoFe2O4/rGO) hybrid was employed as catalyst for Li–O2 batteries. It could effectively lower the ORR (oxygen reduction reaction) and OER (oxygen evolution reaction) overpotentials of the batteries and deliver a large capacity of 12 235 mA h grGO−1 (2116 mA h ghybrid−1). It also exhibited high cyclic stability.
Bioactivity and phytochemical characterization of Arenaria montana L.
Authors: Pereira Eliana , Barros Lillian , Calhelha Ricardo C. , Dueñas Montserrat , Carvalho Ana Maria , Santos-Buelga Celestino , Ferreira Isabel C. F. R.
Published: May 2014

An aqueous extract ofA. montanamay be used as a functional food due to the high antioxidant and cytotoxic activities, and due to the presence of bioactive compounds.
Microfluidic cell sorter-aided directed evolution of a protein-based calcium ion indicator with an inverted fluorescent response
Authors: Zhao Yongxin , Abdelfattah Ahmed S. , Zhao Yufeng , Ruangkittisakul Araya , Ballanyi Klaus , Campbell Robert E. , Harrison D. Jed
Published: May 2014

We describe the use of μFACS to aid the directed evolution of a genetically encoded yellow fluorescent Ca2+indicator.
Liquid polystyrene: a room-temperature photocurable soft lithography compatible pour-and-cure-type polystyrene
Authors: Nargang Tobias M. , Brockmann Lara , Nikolov Pavel Mitkov , Schild Dieter , Helmer Dorothea , Keller Nico , Sachsenheimer Kai , Wilhelm Elisabeth , Pires Leonardo , Dirschka Marian , Kolew Alexander , Schneider Marc , Worgull Matthias , Giselbrecht Stefan , Neumann Christiane , Rapp Bastian E.
Published: May 2014

In this paper we introduce “liquid polystyrene,” a castable photocurable polystyrene prepolymer, for microfluidic prototyping. Using this material, polystyrene, an important polymer in cell biology will become accessible via soft lithography replication.
Automated single cell microbioreactor for monitoring intracellular dynamics and cell growth in free solution
Authors: Johnson-Chavarria Eric M. , Agrawal Utsav , Tanyeri Melikhan , Kuhlman Thomas E. , Schroeder Charles M.
Published: May 2014

The single cell microbioreactor allows for precise and rapid control over the growth environment for cells cultured in free solution, thereby facilitating direct analysis of intracellular dynamics.
A high-efficiency microfluidic device for size-selective trapping and sorting
Authors: Kim Jinho , Erath Jessey , Rodriguez Ana , Yang Changhuei
Published: May 2014

A simple microfluidic device efficiently sorts a mixture of different sized particles and traps them into specific positions.
The effects of 3D channel geometry on CTC passing pressure – towards deformability-based cancer cell separation
Authors: Zhang Zhifeng , Xu Jie , Hong Bin , Chen Xiaolin
Published: May 2014

The geometrical effects of filtering channels in a CTC microfilter have been studied. Pressure signatures and cell deformation have been characterized using numerical modeling.
Highly permeable silicon membranes for shear free chemotaxis and rapid cell labeling
Authors: Chung Henry H. , Chan Charles K. , Khire Tejas S. , Marsh Graham A. , Clark Alfred , Waugh Richard E. , McGrath James L.
Published: May 2014

Ultrathin and nanoporous membranes are integrated into microfluidic devices to enable shear-free chemotaxis and rapid cell labeling.
Continuous-flow microfluidic blood cell sorting for unprocessed whole blood using surface-micromachined microfiltration membranes
Authors: Li Xiang , Chen Weiqiang , Liu Guangyu , Lu Wei , Fu Jianping
Published: May 2014

A microfluidic chip for continuous-flow isolation of WBCs from unprocessed whole blood with high throughput and purity.
Design of gliadin peptide analogues with low affinity for the celiac disease associated HLA–DQ2 protein
Authors: Fraccalvieri Domenico , Motta Stefano , Galliani Guido , Cavaletti Linda , Bonati Laura
Published: May 2014

A computational study on the binding of celiac disease relevant epitopes and their analogues identified the di-hydroxylation of Pro residues as a promising functionalization to lower the affinity for HLA–DQ2.5.
Investigation of novel ropinirole analogues: synthesis, pharmacological evaluation and computational analysis of dopamine D2 receptor functionalized congeners and homobivalent ligands
Authors: Jörg Manuela , Kaczor Agnieszka A. , Mak Frankie S. , Lee Kiew Ching K. , Poso Antti , Miller Neil D. , Scammells Peter J. , Capuano Ben
Published: May 2014

This study includes the synthesis, pharmacological evaluation and molecular modeling study of novel ropinirole-based monovalent and homobivalent ligands.
Synthesis and antiproliferative evaluation of 9-methoxy-6-(piperazin-1-yl)-11H-indeno[1,2-c]quinoline-11-one derivatives. Part 4
Authors: Tseng Chih-Hua , Tzeng Cherng-Chyi , Chiu Chien-Chih , Yang Chiao-Li , Lu Pei-Jung , Chou Chon-Kit , Liu Chun-Yen , Chen Yeh-Long
Published: May 2014

A number of 6,11-disubstituted indenoquinolines were synthesized and evaluated for their antiproliferative activities and mechanism studies.
Adsorption and self-assembly of a ferrocene d- and l-nonapeptide disulfide onto gold and mica substrates
Authors: Hernandez Ramirez V. A. , Pailleret A. , Joiret S. , d'Orlyé F. , Lazerges M. , Perrot H. , Gutierrez Granados S. , Bedioui F. , De León-Rodríguez L. M.
Published: May 2014

Linear nanostructures resulting form self-association of a nonapeptide (left) yield progressively to ring-shaped nanostructures (right).
Amino acid mediated functionalization and reduction of graphene oxide – synthesis and the formation mechanism of nitrogen-doped graphene
Authors: Kumar Anil , Khandelwal Mahima
Published: May 2014

Amino acid mediated reduction of GO through the nucleophilic attack yields N doped graphene in both acidic and basic media.
Facile fabrication of OA-POSS modified near-infrared-emitting CdSeTe alloyed quantum dots and their bioapplications
Authors: Zhao Xue , Zhang Weijia , Wu Yongzhong , Liu Hongzhi , Hao Xiaopeng
Published: May 2014

Highly biocompatible near-infrared-emitting OA-POSS modified CdSeTe QDs were fabricated in aqueous medium and were successfully applied to SiHa cell imaging.
Improving alkynyl(aryl)iodonium salts: 2-anisyl as a superior aryl group
Authors: Hamnett David J. , Moran Wesley J.
Published: May 2014

This article describes the effects of varying this iodoarene building block on the synthesis, reactivity and stability of these salts.
A novel SWCNT platform bearing DOTA and β-cyclodextrin units. “One shot” multidecoration under microwave irradiation
Authors: Calcio Gaudino E. , Tagliapietra S. , Martina K. , Barge A. , Lolli M. , Terreno E. , Lembo D. , Cravotto G.
Published: May 2014

The functionalization of single-walled carbon nanotubes (SWCNTs) via microwave-assisted grafting reactions enables efficient multidecoration in a single step.
Reverse micelles based on β-cyclodextrin-incorporated amphiphilic polyurethane copolymers for protein delivery
Authors: Du Xiaoxu , Song Nan , Yang Ying-Wei , Wu Guolin , Ma Jianbiao , Gao Hui
Published: May 2014

In DCM and ethyl oleate, all the polyurethanes could form reverse micelles, and PEG–HDI–CD polyurethanes demonstrated higher protein loading than PEG–HDI ones.
Facile and material-independent fabrication of poly(luteolin) coatings and their unimpaired antibacterial activity against Staphylococcus aureus after steam sterilization treatments
Authors: Cheng Jingya , Guan Miao , Zhu Jialiang , Wang Changtao , Su Lei , Zhang Xueji
Published: May 2014

Poly(luteolin) coatings fabricatedviafacile one-step autoxidation of luteolin in alkaline solution exhibit thermostable antibacterial activity againstStaphylococcus aureus.
Injectable enzymatically crosslinked hydrogels based on a poly(l-glutamic acid) graft copolymer
Authors: Ren Kaixuan , He Chaoliang , Cheng Yilong , Li Gao , Chen Xuesi
Published: May 2014

Enzyme-mediated injectable hydrogels based on a poly(l-glutamic acid) graft copolymer with tunable physicochemical properties, biodegradability and good biocompatibility were developed.
Reduced ionic conductivity in biaxially compressed ceria
Authors: Shen Weida , Jiang Jun , Hertz Joshua L.
Published: May 2014

Thin film multilayers composed of Y2O3-doped CeO2(YDC) with CeO2, with Ce0.70Zr0.30O2(CZO30), or with Ce0.55Zr0.45O2(CZO45) were fabricated to systematically quantify the effect of biaxial compressive strain on oxygen ion conductivity in YDC.
Enhanced performance of PEM fuel cell using MWCNT reinforced carbon paper
Authors: Maheshwari Priyanka H. , Mathur R. B.
Published: May 2014

Porous conducting carbon paper has been identified as one of the most suitable materials to be used as a fuel cell electrode backing.
Anion dependent silver(i) complexes of pyrazine mono-N-oxide
Authors: Puttreddy Rakesh , Cottam Justine R. A. , Steel Peter J.
Published: May 2014

Pyrazine mono-N-oxide reacts with silver salts to form either discrete complexes involving monodentate N-coordination or 1D coordination polymers in which the ligand acts in a N,O-bridging bidentate coordination mode.
Synthesis, structure and catalytic properties of [Ru(dppp)2(CH3CN)Cl][BPh4] and isolation of catalytically active [Ru(dppp)2Cl][BPh4]: ruthenium catalysed alkyne homocoupling and tandem alkyne–azide cycloaddition
Authors: Das Uttam Kumar , Jena Rajesh K. , Bhattacharjee Manish
Published: May 2014

The complex, [Ru(dppp)2(CH3CN)Cl][BPh4] catalyses coupling of alkynes and subsequent alkyne–azide cycloaddition reaction.
Inorganic–organic hybrid NiO–g-C3N4 photocatalyst for efficient methylene blue degradation using visible light
Authors: Chen Hai-Yu , Qiu Ling-Guang , Xiao Juan-Ding , Ye Sheng , Jiang Xia , Yuan Yu-Peng
Published: May 2014

Hybrid NiO–g-C3N4 photocatalyst shows excellent photostability and enhanced visible-light-driven activity for MB degradation. The improved activity is attributed to the effective separation of charge carriers.
Improved microwave absorption in lightweight resin-based carbon foam by decorating with magnetic and dielectric nanoparticles
Authors: Kumar R. , Singh A. P. , Chand M. , Pant R. P. , Kotnala R. K. , Dhawan S. K. , Mathur R. B. , Dhakate S. R.
Published: May 2014

Carbon foam (CFoam) decorated with Fe3O4–ZnO nanoparticles significantly improved electromagnetic radiation shielding effectiveness which is mainly dominated by absorption component.
Thermal conductivities, mechanical and thermal properties of graphite nanoplatelets/polyphenylene sulfide composites
Authors: Gu Junwei , Du Junjie , Dang Jing , Geng Wangchang , Hu Sihai , Zhang Qiuyu
Published: May 2014

Functionalized pristine graphite nanoplatelets (fGNPs) by methanesulfonic acid/isopropyltrioleictitanate (MSA/NDZ-105) are used to fabricate fGNPs/polyphenylene sulfide (fGNPs/PPS) composites by mechanical ball milling followed by a compression molding method.
Highly dispersed Cu(ii), Co(ii) and Ni(ii) catalysts covalently immobilized on imine-modified silica for cyclohexane oxidation with hydrogen peroxide
Authors: Antony R. , David Manickam S. Theodore , Kollu Pratap , Chandrasekar P. V. , Karuppasamy K. , Balakumar S.
Published: May 2014

This paper describes the synthesis of Cu(ii), Co(ii) and Ni(ii) catalysts immobilized on imine-functionalized silica gel through a 3-aminopropyltriethoxysilane linker.
Effect of metal ions on the morphology of silver nanocrystals
Authors: Ming Gao , Liran Ma , Yuan Gao , Dan Guo , Dingsheng Wang , Jianbin Luo
Published: May 2014

Ag nanoplates were obtained in our developed benzyl alcohol system in the presence of Al3+ ions or Fe3+ ions.
Size-controlled synthesis of uniform akaganeite nanorods and their encapsulation in alginate microbeads for arsenic removal
Authors: Cho Kihun , Shin Bom Yi , Park Hyung Keun , Cha Bong Guen , Kim Jaeyun
Published: May 2014

Alginate microbeads encapsulating the uniform akaganeite nanorods were used for quick, easy arsenic removal from highly contaminated water.
Electro-initiated cationic polymerization in the presence of potassium hexafluoroantimonate
Authors: Yang Feng , Zhu Xiaoqun , Li Chunguang , Yang Jinliang , Stansbury Jeffery W. , Nie Jun
Published: May 2014

The kinetics of electro-initiated polymerization of vinyl ethers in the presence of potassium hexafluoroantimonate are investigated by RT-FT-NIR. The apparatus for real time monitoring of the kinetics of the reaction is set up by using ITO conductive glasses. Potassium hexafluoroantimonate has been proven to be an efficient initiator for electro-initiated polymerization of vinyl ethers.
Dual mode of extraction for Cs+ and Na+ ions with dicyclohexano-18-crown-6 and bis(2-propyloxy)calix[4]crown-6 in ionic liquids: density functional theoretical investigation
Authors: Ali Sk. M. , Joshi J. M. , Singha Deb A. K. , Boda A. , Shenoy K. T. , Ghosh S. K.
Published: May 2014

Experimentally observed distribution constant and theoretically predicted values of ΔGext for Cs+ and Na+ ions with DCH18C6 and BPC6 ligand in ionic liquid and octanol.
A simple and efficient method to prepare a phosphorus modified g-C3N4visible light photocatalyst
Authors: Hu Shaozheng , Ma Lin , You Jiguang , Li Fayun , Fan Zhiping , Wang Fei , Liu Dan , Gui Jianzhou
Published: May 2014

Interstitial P doping is more effective in improving the photocatalytic activity compared with substitutional P doping.
Synthesis and self-assembly of water-soluble polythiophene-graft-poly(ethylene oxide) copolymers
Authors: Mohamed Mohamed Gamal , Cheng Chih-Chia , Lin Yung-Chih , Huang Cheng-Wei , Lu Fang-Hsien , Chang Feng-Chih , Kuo Shiao-Wei
Published: May 2014

Poly(3-hexylthiophene)-graft-poly(ethylene oxide) (P3HT-g-PEO) rod–coil conjugated random copolymers through oxidative polymerization with FeCl3 and facile click chemistry.
Solution processed sun baked electrode material for flexible supercapacitors
Authors: Kurra Narendra , Kiruthika S. , Kulkarni Giridhar U.
Published: May 2014

Pd hexadecylthiolate decomposes under sunlight leading to a conducting nanocrystalline Pd–carbon composite. Thus formed films serve as supercapacitor electrodes. The organic precursor enables the fabrication of micro-supercapacitors using e-beam lithography.
Residence-time dependent cell wall deformation of different Staphylococcus aureus strains on gold measured using surface-enhanced-fluorescence
Authors: Li Jiuyi , Busscher Henk J. , Swartjes Jan J. T. M. , Chen Yun , Harapanahalli Akshay K. , Norde Willem , van der Mei Henny C. , Sjollema Jelmer
Published: May 2014

Bacterial adhesion to surfaces is accompanied by cell wall deformation that may extend to the lipid membrane with an impact on the antimicrobial susceptibility of the organisms.
The role of acrylonitrile in controlling the structure and properties of nanostructured ionomer films
Authors: Tungchaiwattana Somjit , Musa Muhamad Sharan , Yan Junfeng , Lovell Peter A. , Shaw Peter , Saunders Brian R.
Published: May 2014

Copolymerisation of acrylonitrile within core–shell nanoparticles gives ductile nanostructured ionomer films with increased modulus values.
How to repel hot water from a superhydrophobic surface?
Authors: Yu Zhe-Jun , Yang Jieyi , Wan Fang , Ge Quan , Yang Long-Lai , Ding Zun-Liang , Yang De-Quan , Sacher Edward , Isimjan Tayirjan T.
Published: May 2014

We demonstrated the superhydrophobicity of five superhydrophobic surfaces by manipulating water droplet and surface temperatures.
Structural, textural and acid–base properties of carbonate-containing hydroxyapatites
Authors: Silvester Lishil , Lamonier Jean-François , Vannier Rose-Noëlle , Lamonier Carole , Capron Mickaël , Mamede Anne-Sophie , Pourpoint Frédérique , Gervasini Antonella , Dumeignil Franck
Published: May 2014

HAP solids were prepared with different Ca/P ratios and Na+cations before being characterized by XRD, XPS, LEIS, NMR, IR, and TGA. Their acid–base properties were then measured and discussed in relation to the characterization results.
Molecular engineering of small molecules donor materials based on phenoxazine core unit for solution-processed organic solar cells
Authors: Cheng Ming , Yang Xichuan , Chen Cheng , Tan Qin , Sun Licheng
Published: May 2014

An efficiency of 5.60% was achieved forPOZ6:PC71BM-based devices, which were fabricated with the conventional structure of glass/ITO/PEDOT-PSS/active layer/BCP/LiF/Al.
A photonic glucose biosensor for chronic wound prognostics
Authors: Krismastuti Fransiska S. H. , Brooks William L. A. , Sweetman Martin J. , Sumerlin Brent S. , Voelcker Nicolas H.
Published: May 2014

An optical biosensor based on the switching of poly(4-vinylphenylboronic acid) (PVPBA) grafted to the pores of porous silicon (pSi) films in response to pH and glucose.
One-step synthesis of silver nanoshells with bumps for highly sensitive near-IR SERS nanoprobes
Authors: Kang Homan , Yang Jin-Kyoung , Noh Mi Suk , Jo Ahla , Jeong Sinyoung , Lee Minwoo , Lee Somin , Chang Hyejin , Lee Hyunmi , Jeon Su-Ji , Kim Hye-In , Cho Myung-Haing , Lee Ho-Young , Kim Jong-Ho , Jeong Dae Hong , Lee Yoon-Sik
Published: May 2014

Based on AgNSs with bump-structures, the NIR active, ultrasensitive, and biocompatible SERS probes were developed and applied forin vivocell tracking in a live animal.
An optically stable and tunable quantum dot nanocrystal-embedded cholesteric liquid crystal composite laser
Authors: Chen Lin-Jer , Lin Jia-De , Lee Chia-Rong
Published: May 2014

This work demonstrates the first quantum-dot-embedded cholesteric liquid crystal composite laser with an added chiral-azobenzene moiety which possesses optical stability and reversible tunability.
The 2-phenylbenzimidazole-5-sulfonate/layered double hydroxide co-intercalation composite and its luminescence response to nucleotides
Authors: Zheng Shufang , Lu Jun , Li Wu , Qin Yumei , Yan Dongpeng , Evans David G. , Duan Xue
Published: May 2014

2-phenylbenzimidazole-5-sulfonate (PBS) was immobilized into the interlayers of Zn2Al layered double hydroxides (LDHs), which exhibited remarkable violet-to-UV luminescence transformation responsing to nucleotide triphosphates compared with their diphosphate and monophosphate counterparts.
Mouse model for deficiency of methionine synthase reductase exhibits short-term memory impairment and disturbances in brain choline metabolism
Authors: Jadavji Nafisa M. , Bahous Renata H. , Deng Liyuan , Malysheva Olga , Grand’maison Marilyn , Bedell Barry J. , Caudill Marie A. , Rozen Rima
Published: May 2014

Hyperhomocysteinaemia can contribute to cognitive impairment and brain atrophy. MTRR (methionine synthase reductase) activates methionine synthase, which catalyses homocysteine remethylation to methionine. Severe MTRR deficiency results in homocystinuria with cognitive and motor impairments. An MTRR polymorphism may influence homocysteine levels and reproductive outcomes. The goal of the present study was to determine whether mild hyperhomocysteinaemia affects neurological function in a mouse model with Mtrr deficiency. Mtrr+/+, Mtrr+/gt and Mtrrgt/gt mice (3 months old) were assessed for short-term memory, brain volumes and hippocampal morphology. We also measured DNA methylation, apoptosis, neurogenesis, choline metabolites and expression of ChAT (choline acetyltransferase) and AChE (acetylcholinesterase) in the hippocampus. Mtrrgt/gt mice exhibited short-term memory impairment on two tasks. They had global DNA hypomethylation and decreased choline, betaine and acetylcholine levels. Expression of ChAT and AChE was increased and decreased respectively. At 3 weeks of age, they showed increased neurogenesis. In the cerebellum, mutant mice had DNA hypomethylation, decreased choline and increased expression of ChAT. Our work demonstrates that mild hyperhomocysteinaemia is associated with memory impairment. We propose a mechanism whereby a deficiency in methionine synthesis leads to hypomethylation and compensatory disturbances in choline metabolism in the hippocampus. This disturbance affects the levels of acetylcholine, a critical neurotransmitter in learning and memory.
Orthopaedic implant failure: aseptic implant loosening–the contribution and future challenges of mouse models in translational research
Authors: Cordova Luis Alberto , Stresing Verena , Gobin Bérengère , Rosset Philippe , Passuti Norbert , Gouin François , Trichet Valérie , Layrolle Pierre , Heymann Dominique
Published: May 2014

Aseptic loosening as a result of wear debris is considered to be the main cause of long-term implant failure in orthopaedic surgery and improved biomaterials for bearing surfaces decreases significantly the release of micrometric wear particles. Increasingly, in-depth knowledge of osteoimmunology highlights the role of nanoparticles and ions released from some of these new bearing couples, opening up a new era in the comprehension of aseptic loosening. Mouse models have been essential in the progress made in the early comprehension of pathophysiology and in testing new therapeutic agents for particle-induced osteolysis. However, despite this encouraging progress, there is still no valid clinical alternative to revision surgery. The present review provides an update of the most commonly used bearing couples, the current concepts regarding particle–cell interactions and the approaches used to study the biology of periprosthetic osteolysis. It also discusses the contribution and future challenges of mouse models for successful translation of the preclinical progress into clinical applications.
Effect of field oxide structure on endurance characteristics of NAND flash memory
Authors: Kim Kiyong , Yoon Joongho , Kim Yungsam , Kim Hongsig , Lee Haebum , Cho Insoo , Kim Sangsoo , Choi Byoungdeog
Published: May 2014

As NAND flash cell sizes have been scaled down, endurance characteristics have suffered severe limitations in the NAND flash memory. Two NAND flash cell structures, the wing spacer structure and the no wing spacer structure, have been constructed to compare their endurance characteristics. The wing spacer structure has more trap sites at the active edge area due to program/erase (P/E) cycle stress because of the short distance from the active edge to the control poly. Thus, the endurance characteristics are degraded by traps generated at the active edge area. In addition, it has been confirmed that the threshold voltage (VT) shift of the wing spacer structure was about 15.2% higher in erased cells and 10.9 % higher in programmed cells than those of the no wing spacer structure after the stress of 104 P/E cycles.
Performance analysis of interference‐limited cooperative systems with relay selection over independent log‐normal fading channels
Authors: Pan Gaofeng , Chen Yunfei , Feng Quanyuan
Published: May 2014

Closed‐form expressions of the upper and lower bounds of the outage probability are derived for interference‐limited dual‐hop decode‐and‐forward and channel‐state‐information‐assisted amplify‐and‐forward relay systems using three relay selection (RS) schemes [optimal source–relay link (OSRL) scheme, optimal relay–destination link (ORDL) scheme and optimal source–relay–destination link (OSRDL) scheme] over independent log‐normal fading channels. Multiple interferers at both relay and destination are considered. The diversity order of the targeted cooperative system under the three different RS schemes is analysed. The analysis shows that the asymptotic relative diversity orders (ARDO) for OSRL, ORDL and OSRDL schemes are 2, 2 and (N + 1) (where N is the number of the relay candidates), respectively. Finally, the ARDO is verified by simulation results.
Easy tuning of fractional‐order holds to reduce transient energy consumption of lightly damped resonant systems
Authors: Ugalde Unai , Bárcena Rafael , Basterretxea Koldo
Published: May 2014

In this study, the authors show that it is particularly advantageous to use the fractional‐order hold (FROH) instead of the zero‐order hold (ZOH) in the digital control of lightly damped resonant systems, as far as transient energy consumption is concerned. First, they show that for a typical digital controller choice FROH reconstruction may well produce a continuous‐time signal with less associated energy than ZOH reconstruction. Second, they focus on lightly damped resonant systems, where high energy savings are likely to occur because of the initially swinging nature of the discrete‐time control signals driving these systems. Then, they propose an easy procedure to tune the FROH, which is not bound to z ‐domain controller design, and is therefore radically different from most, if not all, procedures published so far. Finally, they provide some simulation‐based application examples confirming the significant control energy reduction attained, in excess of 50%, while not hindering the output performance.
Edge preservation image enlargement and enhancement method based on the adaptive Perona–Malik non‐linear diffusion model
Authors: Maiseli Baraka , Elisha Ogada , Mei Jiangyuan , Gao Huijun
Published: May 2014

In this study, the authors have proposed a new super resolution (SR) model based on the Perona–Malik regularisation scheme. The new model integrates into its regularisation component an adaptive exponential term which automatically adjusts itself depending on the local image features. This lends more sensitivity and adaptability to the proposed model, thereby making the reconstruction process much less punishing against semantically important features. Therefore, regularisation is stronger in homogeneous regions, and weaker in the neighbourhood of boundaries. The proposed method has a promising capability of supressing noise more effectively, while preserving important image features. The approach used differs significantly from the available methods, especially in the manner in which adaptability has been deployed. Noting that SR methods are less sensitive to the local image topography, a factor that causes the super‐resolved images to be visually poor, the new method sensitively probes the local features of the image, and determines the necessary level of reconstruction and regularisation. Additionally, the formulation robustly introduces a backward diffusion, a phenomenon proved from literature to have a tendency of sharpening edges. The authors have included empirical reconstruction results to demonstrate that their model produces better images in comparison with other classical methods.
Structure, magnetic ordering, and spin filtering efficiency of NiFe2O4(111) ultrathin films
Authors: Matzen S. , Moussy J.-B. , Wei P. , Gatel C. , Cezar J. C. , Arrio M. A. , Sainctavit Ph. , Moodera J. S.
Published: May 2014

NiFe2O4(111) ultrathin films (3–5 nm) have been grown by oxygen-assisted molecular beam epitaxy and integrated as effective spin-filter barriers. Structural and magnetic characterizations have been performed in order to investigate the presence of defects that could limit the spin filtering efficiency. These analyses have revealed the full strain relaxation of the layers with a cationic order in agreement with the inverse spinel structure but also the presence of antiphase boundaries. A spin-polarization up to +25% has been directly measured by the Meservey-Tedrow technique in Pt(111)/NiFe2O4(111)/γ-Al2O3(111)/Al tunnel junctions. The unexpected positive sign and relatively small value of the spin-polarization are discussed, in comparison with predictions and previous indirect tunnelling magnetoresistance measurements.
Photoelectron spectroscopy of aqueous solutions: Streaming potentials of NaX (X = Cl, Br, and I) solutions and electron binding energies of liquid water and X−
Authors: Kurahashi Naoya , Karashima Shutaro , Tang Ying , Horio Takuya , Abulimiti Bumaliya , Suzuki Yoshi-Ichi , Ogi Yoshihiro , Oura Masaki , Suzuki Toshinori
Published: May 2014

The streaming potentials of liquid beams of aqueous NaCl, NaBr, and NaI solutions are measured using soft X-ray, He(I), and laser multiphoton ionization photoelectron spectroscopy. Gaseous molecules are ionized in the vicinity of liquid beams and the photoelectron energy shifts are measured as a function of the distance between the ionization point and the liquid beam. The streaming potentials change their polarity with concentration of electrolytes, from which the singular points of concentration eliminating the streaming potentials are determined. The streaming currents measured in air also vanish at these concentrations. The electron binding energies of liquid water and I−, Br−, and Cl− anions are revisited and determined more accurately than in previous studies.
Dispersion-correcting potentials can significantly improve the bond dissociation enthalpies and noncovalent binding energies predicted by density-functional theory
Authors: DiLabio Gino A. , Koleini Mohammad
Published: May 2014

Dispersion-correcting potentials (DCPs) are atom-centered Gaussian functions that are applied in a manner that is similar to effective core potentials. Previous work on DCPs has focussed on their use as a simple means of improving the ability of conventional density-functional theory methods to predict the binding energies of noncovalently bonded molecular dimers. We show in this work that DCPs developed for use with the LC-ωPBE functional along with 6-31+G(2d,2p) basis sets are capable of simultaneously improving predicted noncovalent binding energies of van der Waals dimer complexes and covalent bond dissociation enthalpies in molecules. Specifically, the DCPs developed herein for the C, H, N, and O atoms provide binding energies for a set of 66 noncovalently bonded molecular dimers (the “S66” set) with a mean absolute error (MAE) of 0.21 kcal/mol, which represents an improvement of more than a factor of 10 over unadorned LC-ωPBE/6-31+G(2d,2p) and almost a factor of two improvement over LC-ωPBE/6-31+G(2d,2p) used in conjunction with the “D3” pairwise dispersion energy corrections. In addition, the DCPs reduce the MAE of calculated X-H and X-Y (X,Y = C, H, N, O) bond dissociation enthalpies for a set of 40 species from 3.2 kcal/mol obtained with unadorned LC-ωPBE/6-31+G(2d,2p) to 1.6 kcal/mol. Our findings demonstrate that broad improvements to the performance of DFT methods may be achievable through the use of DCPs.
Effect of surface structure on workfunction and Schottky-barrier height in SrRuO3/SrTiO3 (001) heterojunctions
Authors: Sampath Kumar V. , Niranjan Manish K.
Published: May 2014

We present an ab-initio theoretical study of work functions and surface energies of SrRuO3 (001) surfaces and Schottky-barrier heights (SBHs) at various interfaces in SrRuO3/SrTiO3 (001) heterostructure within the framework of the density-functional theory. The SrRuO3 workfunctions are found to exhibit strong dependence on surface terminations. The workfunction of two defect-free SrRuO3 (001) surface terminations, viz., SrO and RuO2, differ by as much as 2.37 eV. The p-type SBH at the RuO2/SrO/TiO2 interface is calculated to be 1.27 eV. The substitution of interfacial SrO layer by isoelectronic BaO layer induces small change in the p-SBH (∼0.06 eV). However, the p-SBH is reduced significantly (∼0.5 eV) as the RuO2 layer is substituted by MnO2 layer due to large change in the interfacial dipole. The p-SBH at different interfaces in SrRuO3/SrTiO3 structures are also estimated using semi-empirical metal-induced-gap-states (MIGS) model. The estimated values are found to be larger by ∼2 eV than those obtained using ab-initio method, rendering the validity of MIGS model questionable in the prediction of SBH in all-oxide metal/dielectric heterojunctions. The modification of SBH by interfacial doping offers the possibility of contact resistance control in SrRuO3/SrTiO3 heterostructures and related devices.
Accounting for conformational flexibility and torsional anharmonicity in the H + CH3CH2OH hydrogen abstraction reactions: A multi-path variational transition state theory study
Authors: Meana-Pañeda Rubén , Fernández-Ramos Antonio
Published: May 2014

This work reports a detailed theoretical study of the hydrogen abstraction reactions from ethanol by atomic hydrogen. The calculated thermal rate constants take into account torsional anharmonicity and conformational flexibility, in addition to the variational and tunneling effects. Specifically, the kinetics calculations were performed by using multi-path canonical variational transition state theory with least-action path tunneling corrections, to which we have added the two-dimensional non-separable method to take into account torsional anharmonicity. The multi-path thermal rate constant is expressed as a sum over conformational reaction channels. Each of these channels includes all the transition states that can be reached by internal rotations. The results show that, in the interval of temperatures between 250 and 2500 K, the account for multiple paths leads to higher thermal rate constants with respect to the single path approach, mainly at low and at high temperatures. In addition, torsional anharmonicity enhances the slope of the Arrhenius plot in this range of temperatures. Finally, we show that the incorporation of tunneling into the hydrogen abstraction reactions substantially changes the contribution of each of the transition states to the conformational reaction channel.
Self-regulated in-plane polarity of [11¯00]-oriented GaN domains coalesced from twins grown on a SiO2-patterned m-plane sapphire substrate
Authors: Lee Hyemi , Jue Miyeon , Yoon Hansub , Lee Sanghwa , Kim Chinkyo
Published: May 2014

In-plane polarity of [11¯00]-oriented GaN domains coalesced from twins grown on a SiO2-patterned m-plane sapphire substrate was observed to be self-regulated in such a way that basal faces of coalesced domains were mainly found to have the (0001¯) polarity only. This self-regulation behavior of in-plane polarity was explained by a computational simulation of plan-view surface morphology evolution during coalescence of twins. Based on a computational simulation, asymmetrically suppressed growth rates of twins near a SiO2 pattern were proposed to be responsible for the survival of the slower growing (0001¯) basal faces instead of the faster growing (0001) basal faces during coalescence of twins.