bluuebunny/crossref_metadata_2025_split huggingface dataset:
Embedding MnO@Mn3O4 Nanoparticles in an N‐Doped‐Carbon Framework Derived from Mn‐Organic Clusters for Efficient Lithium Storage
Authors: Chu Yanting , Guo Lingyu , Xi Baojuan , Feng Zhenyu , Wu Fangfang , Lin Yue , Liu Jincheng , Sun Di , Feng Jinkui , Qian Yitai , Xiong Shenglin 
Published: December 2017

AbstractThe first synthesis of MnO@Mn3O4 nanoparticles embedded in an N‐doped porous carbon framework (MnO@Mn3O4/NPCF) through pyrolysis of mixed‐valent Mn8 clusters is reported. The unique features of MnO@Mn3O4/NPCF are derived from the distinct interfacial structure of the Mn8 clusters, implying a new methodological strategy for hybrids. The characteristics of MnO@Mn3O4 are determined by conducting high angle annular dark‐field scanning transmission electron microscopy (HAADF‐STEM) and electron energy loss spectroscopy (EELS) valence‐state analyses. Due to the combined advantages of MnO@Mn3O4, the uniform distribution, and the NPCF, MnO@Mn3O4/NPCF displays unprecedented lithium‐storage performance (1500 mA h g−1 at 0.2 A g−1 over 270 cycles). Quantitative analysis reveals that capacitance and diffusion mechanisms account for Li+ storage, wherein the former dominates. First‐principles calculations highlight the strong affiliation of MnO@Mn3O4 and the NPCF, which favor structural stability. Meanwhile, defects of the NPCF decrease the diffusion energy barrier, thus enhancing the Li+ pseudocapacitive process, reversible capacity, and long cycling performance. This work presents a new methodology to construct composites for energy storage and conversion.
Photoactuated Pens for Molecular Printing
Authors: Huang Zhongjie , Li Le , Zhang Xu A. , Alsharif Nourin , Wu Xiaojian , Peng Zhiwei , Cheng Xiyuan , Wang Peng , Brown Keith A. , Wang YuHuang 
Published: December 2017

AbstractThe photoactuation of pen arrays made of polydimethylsiloxane carbon nanotube composites is explored, and the first demonstration of photoactuated pens for molecular printing is reported. Photoactuation of these composites is characterized using atomic force microscopy and found to produce microscale motion in response to modest illumination, with an actuation efficiency as high as 200 nm mW−1 on the sub‐1 s time scale. Arrays of composite pens are synthesized and it is found that local illumination is capable of moving selected pens by more than 3 µm out of the plane, bringing them into contact to perform controllable and high quality printing while completely shutting off the nonilluminated counterparts. In light of the scalability limitations of nanolithography, this work presents an important step and paves the way for arbitrary control of individual pens in massive arrays. As an example of a scalable soft actuator, this approach can also aid progress in other fields such as soft robotics and microfluidics.
Foldable Electrode Architectures Based on Silver‐Nanowire‐Wound or Carbon‐Nanotube‐Webbed Micrometer‐Scale Fibers of Polyethylene Terephthalate Mats for Flexible Lithium‐Ion Batteries
Authors: Hwang Chihyun , Song Woo‐Jin , Han Jung‐Gu , Bae Sohyun , Song Gyujin , Choi Nam‐Soon , Park Soojin , Song Hyun‐Kon 
Published: December 2017

AbstractA crumply and highly flexible lithium‐ion battery is realized by using microfiber mat electrodes in which the microfibers are wound or webbed with conductive nanowires. This electrode architecture guarantees extraordinary mechanical durability without any increase in resistance after folding 1000 times. Its areal energy density is easily controllable by the number of folded stacks of a piece of the electrode mat. Deformable lithium‐ion batteries of lithium iron phosphate as cathode and lithium titanium oxide as anode at high areal capacity (3.2 mAh cm−2) are successfully operated without structural failure and performance loss, even after repeated crumpling and folding during charging and discharging.
Developmental differences between neonatal and adult human erythropoiesis
Authors: Yan Hongxia , Hale John , Jaffray Julie , Li Jie , Wang Yaomei , Huang Yumin , An Xiuli , Hillyer Christopher , Wang Nan , Kinet Sandrina , Taylor Naomi , Mohandas Narla , Narla Anupama , Blanc Lionel 
Published: December 2017

AbstractStudies of human erythropoiesis have relied, for the most part, on the in vitro differentiation of hematopoietic stem and progenitor cells (HSPC) from different sources. Here, we report that despite the common core erythroid program that exists between cord blood (CB)‐ and peripheral blood (PB)‐HSPC induced toward erythroid differentiation in vitro, significant functional differences exist. We undertook a comparative analysis of human erythropoiesis using these two different sources of HSPC. Upon in vitro erythroid differentiation, CB‐derived cells proliferated 4‐fold more than PB‐derived cells. However, CB‐derived cells exhibited a delayed kinetics of differentiation, resulting in an increased number of progenitors, notably colony‐forming unit (CFU‐E). The phenotypes of early erythroid differentiation stages also differed between the two sources with a significantly higher percentage of IL3R‐GPA‐CD34+CD36+ cells generated from PB‐ than CB‐HSPCs. This subset was found to generate both burst‐forming unit (BFU‐E) and CFU‐E colonies in colony‐forming assays. To further understand the differences between CB‐ and PB‐HSPC, cells at eight stages of erythroid differentiation were sorted from each of the two sources and their transcriptional profiles were compared. We document differences at the CD34, BFU‐E, poly‐ and orthochromatic stages. Genes exhibiting the most significant differences in expression between HSPC sources clustered into cell cycle‐ and autophagy‐related pathways. Altogether, our studies provide a qualitative and quantitative comparative analysis of human erythropoiesis, highlighting the impact of the developmental origin of HSPCs on erythroid differentiation.
Efficient Assembly of Tetracyclic Framework of Fluorenols through Silver‐Catalyzed Tandem Reaction of Acceptor‐Enynals and Alkynes via Unfavorable 6‐endo‐dig Cyclization
Authors: Liang Renxiao , Zhang Jiantao , Chen Lianfen , Zhu Shifa 
Published: December 2017

AbstractWe present a silver‐catalyzed reaction of acceptor‐enynals with alkynes to assemble tetracyclic framework of fluorenols efficiently, in which the reaction was proposed to proceed through an unfavorable 6‐endo‐dig cyclization, followed by a tandem [4+2] cycloaddition/Friedel–Crafts reaction. The reaction could be conducted in one pot for diaryl alkynes substrates. For terminal aryl alkyne or arylalkyl alkyne substrates, the Friedel–Crafts reaction has to be performed in the absence of alkynes. The control reactions demonstrated that there was competition between [Ag]⋅⋅⋅alkyne and [Ag]⋅⋅⋅O=CR2.
Kohlenhydratresponsive Oberflächenhaftung basierend auf dynamisch kovalenter Chemie zwischen Phenylboronsäure‐ und Catecholpolymerbürsten
Authors: Lamping Sebastian , Otremba Tobias , Ravoo Bart Jan 
Published: December 2017

AbstractEin Kleber, dessen starke Haftfähigkeit (2.38 kg) auf dynamisch kovalenter Chemie beruht, welche zudem wasserbeständig und durch Kohlenhydrateinfluss schaltbar ist, wird vorgestellt. Zu diesem Zweck wurden Glas‐ und Siliciumoberflächen mithilfe der oberflächeninitiierten radikalischen Atomtransferpolymerisation (surface‐induced atom transfer radical polymerization, SI‐ATRP) mit Copolymeren, die zum einen Phenylboronsäuren und zum anderen Catechole enthielten, funktionalisiert. Nach Strukturierung mit Mikrokontaktdruck (microcontact printing, μCP) wird aus den Polymerbürsten ein kohlenhydratresponsiver supramolekularer “Klettverschluss” erhalten.
Fuel‐Selective Transient Activation of Nanosystems for Signal Generation
Authors: della Sala Flavio , Maiti Subhabrata , Bonanni Andrea , Scrimin Paolo , Prins Leonard J. 
Published: December 2017

AbstractThe transient activation of function using chemical fuels is common in nature, but much less in synthetic systems. Progress towards the development of systems with a complexity similar to that of natural ones requires chemical fuel selectivity. Here, we show that a self‐assembled nanosystem, composed of monolayer‐protected gold nanoparticles and a fluorogenic peptide, is activated for transient signal generation only in case the chemical fuel matches the recognition site present at the nanoparticle surface. A modification of the recognition site in the nanosystem completely changes the chemical fuel selectivity. When two nanosystems are simultaneously present, the selectivity expressed by the system depends on the concentration of nucleotide added.
Katalytische, positions‐ und enantioselektive C‐H‐Oxygenierung durch einen chiralen Mangan‐Porphyrin‐Komplex mit einer entfernten Bindungsstelle
Authors: Burg Finn , Gicquel Maxime , Breitenlechner Stefan , Pöthig Alexander , Bach Thorsten 
Published: December 2017

AbstractEin chiraler Mangan‐Porphyrin‐Komplex mit einem Wasserstoffbrückenmotiv wurde synthetisiert und anschließend in der katalytischen C‐H‐Oxygenierung von 3,4‐Dihydrochinolonen erprobt. Die gewünschte Oxygenierung fand mit perfekter Positionsselektivität an der C4‐Methylengruppe und mit hoher Enantioselektivität zugunsten des entsprechenden (4S)‐konfigurierten sekundären Alkohols statt (12 Beispiele, 29–97 % Umsatz, 19–68 % Ausbeute, 87–99 % ee). Mechanistische Studien unterstützen einen geschwindigkeits‐ und selektivitätsbestimmenden Angriff des reaktiven Mangan‐Oxo‐Komplexes am Wasserstoffbrücken‐gebundenen Substrat sowie eine Sauerstoffübertragung durch einen Rebound‐Mechanismus.
Mechanofluorochromic Carbon Nanodots: Controllable Pressure‐Triggered Blue‐ and Red‐Shifted Photoluminescence
Authors: Liu Cui , Xiao Guanjun , Yang Mengli , Zou Bo , Zhang Zhi‐Ling , Pang Dai‐Wen 
Published: December 2017

AbstractMechanofluorochromic materials, which change their photoluminescence (PL) colors in responding to mechanical stimuli, can be used as mechanosensors, security papers, and photoelectronic devices. However, traditional mechanofluorochromic materials can only be adjusted to a monotone direction upon the external stimuli. Controllable pressure‐triggered blue‐ and red‐shifted PL is reported for C‐dots. The origin of mechanofluorochromism (MFC) in C‐dots is interpreted based on structure–property relationships. The carbonyl group and the π‐conjugated system play key roles in the PL change of C‐dots under high pressure. As the pressure increases, the enhanced π–π stacking of the π‐conjugated system causes the red‐shift of PL, while the conversion of carbonyl groups eventually induces a blue‐shift. Together with their low toxicity, good hydrophilicity, and small size, the tunable MFC property would boost various potential applications of C‐dots.
A Non‐Competitive Inhibitor of VCP/p97 and VPS4 Reveals Conserved Allosteric Circuits in Type I and II AAA ATPases
Authors: Pöhler Robert , Krahn Jan H. , van den Boom Johannes , Dobrynin Grzegorz , Kaschani Farnusch , Eggenweiler Hans‐Michael , Zenke Frank T. , Kaiser Markus , Meyer Hemmo 
Published: December 2017

AbstractAAA ATPases have pivotal functions in diverse cellular processes essential for survival and proliferation. Revealing strategies for chemical inhibition of this class of enzymes is therefore of great interest for the development of novel chemotherapies or chemical tools. Here, we characterize the compound MSC1094308 as a reversible, allosteric inhibitor of the type II AAA ATPase human ubiquitin‐directed unfoldase (VCP)/p97 and the type I AAA ATPase VPS4B. Subsequent proteomic, genetic and biochemical studies indicate that MSC1094308 binds to a previously characterized drugable hotspot of p97, thereby inhibiting the D2 ATPase activity. Our results furthermore indicate that a similar allosteric site exists in VPS4B, suggesting conserved allosteric circuits and drugable sites in both type I and II AAA ATPases. Our results may thus guide future chemical tool and drug discovery efforts for the biomedically relevant AAA ATPases.
Hydrolysis Batteries: Generating Electrical Energy during Hydrogen Absorption
Authors: Xiao Rui , Chen Jun , Fu Kai , Zheng Xinyao , Wang Teng , Zheng Jie , Li Xingguo 
Published: December 2017

AbstractThe hydrolysis reaction of aluminum can be decoupled into a battery by pairing an Al foil with a Pd‐capped yttrium dihydride (YH2–Pd) electrode. This hydrolysis battery generates a voltage around 0.45 V and leads to hydrogen absorption into the YH2 layer. This represents a new hydrogen absorption mechanism featuring electrical energy generation during hydrogen absorption. The hydrolysis battery converts 8–15 % of the thermal energy of the hydrolysis reaction into usable electrical energy, leading to much higher energy efficiency compared to that of direct hydrolysis.
Efficient Synthesis of Arylated Furans by a Sequential Rh‐Catalyzed Arylation and Cycloisomerization of Cyclopropenes
Authors: Wang Xiaoming , Lerchen Andreas , Daniliuc Constantin G. , Glorius Frank 
Published: December 2017

AbstractA novel and efficient strategy for the synthesis of arylated furans was successfully developed by a RhIII‐catalyzed coupling of N‐phenoxyacetamides and cyclopropenyl esters. Mechanistic investigation reveals that the arylated furans are formed via arylation of the cyclopropenyl esters followed by cycloisomerization.
Site‐ and Enantioselective C−H Oxygenation Catalyzed by a Chiral Manganese Porphyrin Complex with a Remote Binding Site
Authors: Burg Finn , Gicquel Maxime , Breitenlechner Stefan , Pöthig Alexander , Bach Thorsten 
Published: December 2017

AbstractA chiral manganese porphyrin complex with a two‐point hydrogen‐bonding site was prepared and probed in catalytic C−H oxygenation reactions of 3,4‐dihydroquinolones. The desired oxygenation occurred with perfect site selectivity at the C4 methylene group and with high enantioselectivity in favor of the respective 4S‐configured secondary alcohols (12 examples, 29–97 % conversion, 19–68 % yield, 87–99 % ee). Mechanistic studies support the hypothesis that the reaction proceeds through a rate‐ and selectivity‐determining attack of the reactive manganese oxo complex at the hydrogen‐bound substrate and an oxygen transfer by a rebound mechanism.
Synthesis, characterization, DNA binding, apoptosis and molecular docking of three Mn(II), Zn(II) and Cu(II) complexes with terpyridine‐based carboxylic acid
Authors: Gao En‐Jun , Feng Yun‐Hui , Su Jun‐Qi , Meng Bo , Jia Bing , Qi Zhen‐Zhen , Peng Ting‐Ting , Zhu Ming‐Chang 
Published: December 2017

A series of novel cytotoxic compounds, [Mn(cpt)2], [Zn(tpt)(H2O)2]⋅DMA⋅2(H2O) and [Cu(tpt)]⋅DMA (cpt = 4′‐(4‐carboxyphenyl)‐2,2′:6′,2″‐terpyridine, tpt = 4‐(2,4,6‐tricarboxylphenyl)‐2,2′:6′,2″‐terpyridine, DMA = (CH3)2NH), were isolated and characterized. The structures of these complexes were characterized using single‐crystal X‐ray diffraction. The mode and extent of binding between fish sperm DNA and the complexes were investigated using fluorescence spectroscopy and molecular docking. These results indicate the ability of the complexes to bind to DNA with different binding affinities. The binding of the Zn(II) complex with DNA is stronger than that of the corresponding Cu(II) analogue, which is expected due to the z* effect and geometry. The ability of these complexes to cleave pBR322 plasmid DNA was demonstrated using gel electrophoresis assay, showing that the complexes have effective DNA cleavage activity. In addition, the cytotoxic effects of these complexes were examined on HeLa cells (human cervix epithelia carcinoma cells) in vitro. The three complexes exhibit different cytotoxic effects and decent cancer cell inhibitory rate. This means that the structures and type of metal have a great influence on the activity of these novel complexes.
Re‐treated nanocellulose whiskers alongside a polyolefin elastomer to toughen and improve polypropylene composites
Authors: Zhang Yajuan , Jiang Xianyou , Bai Zhiwei , Wang Jikui , Qian Ziming , Liu Yaxin 
Published: December 2017

ABSTRACTNanocellulose whiskers grafted with a polyolefin elastomer (POE–NCW) were prepared through the reaction of nanocellulose whiskers and a polyolefin elastomer (POE). This was followed by the blending of POE–NCW with polypropylene (PP), and thus, ternary nanocomposites were obtained. When the dosage of POE–NCW was 2%, the tensile strength, storage modulus, and Vicat softening temperature of the ternary nanocomposites increased by 60%, 35%, and 13 °C, respectively. A core–shell‐like cladding structure was formed by the coating of POE on the nanorigid particles; the toughness and rigidity of the composites were both significantly improved, and this prevented brittle fracture under impact and enlarges the range of applications for PP composites. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018, 135, 46066.
Synthesis of a water‐soluble, rubber seed oil–based sulfonate and its tribological properties as a water‐based lubricant additive
Authors: Ding Haiyang , Wang Mei , Li Mei , Huang Kun , Li Shouhai , Xu Lina , Yang Xiaohua , Xia Jianling 
Published: December 2017

ABSTRACTA novel, water‐based oleic acid (OA)/2‐acryloylamino‐2‐methyl‐1‐propanesulfonic acid (AMPS) copolymer was successfully synthesized as a water‐based lubricant additive. The OA‐AMPS copolymer was characterized by Fourier transform infrared and proton NMR spectroscopies and then used as a lubricant additive in water. The lubrication properties of water‐miscible cutting fluids with the OA‐AMPS copolymer additive were investigated using a four‐ball friction tester. The surface of the wear scars was explored using scanning electron microscopy and X‐ray photoelectron spectroscopy. The addition of the synthesized OA‐AMPS copolymer improved the friction coefficient and wear scar diameter of water. The maximum nonseizure load increased from 95 to 431 N, and the anticorrosion ability on copper was categorized as 1b. Good antiwear and friction‐reducing properties for water were observed and attributed to the absorption and tribochemical films composed of iron oxide and ferrous disulfide. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018, 135, 46119.
Improving the antifouling properties of polypropylene surfaces by melt blending with polyethylene glycol diblock copolymers
Authors: Garle Amit L. , White Fernanda , Budhlall Bridgette M. 
Published: December 2017

ABSTRACTProtein‐resistant polyethylene‐block‐poly(ethylene glycol) (PE‐b‐PEG) copolymers of different molecular weights at various concentrations were compounded by melt blending with polypropylene (PP) polymers in order to enhance their antifouling properties. Phase separation of the PE‐b‐PEG copolymer and its migration to the surface of the PP blend, was confirmed by attenuated total reflectance–Fourier transform infrared, X‐ray photoelectron spectroscopy, and static water contact angle measurements. Enrichment of PEG chains at the surface of the blends increased with increasing PE‐b‐PEG copolymer concentration and molecular weight. The PP blends compounded with PE‐b‐PEG copolymer having the lowest molecular weight (875 g mol−1), at the lowest concentration (1 wt %), gave the lowest bovine serum protein adsorption (30% less) compared to that of neat PP. At higher concentrations (5 and 10 wt %), and higher molecular weights (920, 1400, and 2250 g mol−1), the PE‐b‐PEG copolymers leached‐out resulting in protein adsorption comparable to that of neat PP. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018, 135, 46122.
Magnetic polystyrene–palygorskite nanocomposite obtained by heterogeneous phase polymerization to apply in the treatment of oily waters
Authors: Middea Antonieta , Spinelli Luciana , Souza Junior Fernando Gomes de , Neumann Reiner , Fernandes Thais , Faulstich Fabiano Richard Leite , Gomes Otavio 
Published: December 2017

ABSTRACTWater contaminated by oil poses challenges to the management of water resources. Magnetic nanoparticles has been issue of different potential applications including remotion oil from water. Magnetic polystyrene–palygorskite nanocomposites were prepared by a heterogeneous phase polymerization for the removal of organic contaminants from water. The organo‐Fe3O4‐palygorskite nanoparticles were coated with polystyrene, forming water repellent and oil absorbing surfaces to promote the removal of oil from the surfaces of nanocomposites by applying an external magnetic field. X‐ray fluorescence, X‐ray diffraction, scanning electron microscopy, zeta potential and size distribution measurement, surface area determination by BET, density measurement by He pycnometry, carbon grade determination, thermogravimetric analysis, Fourier‐transform infrared spectroscopy, Raman spectroscopy, and evaluation of hydrophobicity by contact angle were used to characterize the nanoparticles. The magnetic nanocomposite obtained showed excellent hydrophobicity, around 78° contact angle. In addition, oil removal capability tests were also performed, according to which the preliminary results indicated removal of approximately 98% of oil in synthetic oily water samples. The oil–water separation using this magnetic nanocomposite provides a promising alternative strategy for water treatment. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018, 135, 46162.
Mushroom polysaccharides‐incorporated cellulose nanofiber films with improved mechanical, moisture barrier, and antioxidant properties
Authors: Fang Donglu , Deng Zilong , Jung Jooyeoun , Hu Qiuhui , Zhao Yanyun 
Published: December 2017

ABSTRACTMushroom polysaccharides (MP), including white MP, brown MP, and enoki MP, were incorporated into cellulose nanofiber (CNF). Studies on thermal property, structure, crystallinity, and morphology of CNF‐MP films revealed that MP was well interacted with and adsorbed onto CNF. Incorporation of MP significantly (P < 0.05) increased tensile strength and reduced water vapor permeability of CNF film. CNF‐MP films possessed higher antioxidant activity than CNF only or CNF‐chitosan film, and the antioxidant activity of released components from CNF‐MP films immersed in water was higher than that released from films immersed in methanol. Radical scavenging activity and reducing ability were major antioxidant mechanisms of CNF‐MP films. These trends were consistent with the results of total phenolics content released from films and the antioxidant activity of MP themselves. This study demonstrated CNF‐MP films may be used as packaging material for preventing oxidation and/or dehydration of food during storage. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018, 135, 46166.