bluuebunny/crossref_metadata_2025_split huggingface dataset:
Mixed‐Dimensional 1D ZnO–2D WSe2 van der Waals Heterojunction Device for Photosensors
Authors: Lee Young Tack , Jeon Pyo Jin , Han Jae Hyun , Ahn Jongtae , Lee Hyo Sun , Lim June Yeong , Choi Won Kook , Song Jin Dong , Park Min‐Chul , Im Seongil , Hwang Do Kyung 
Published: November 2017

Abstract2D layered van der Waals (vdW) atomic crystals are an emerging class of new materials that are receiving increasing attention owing to their unique properties. In particular, the dangling‐bond‐free surface of 2D materials enables integration of differently dimensioned materials into mixed‐dimensional vdW heterostructures. Such mixed‐dimensional heterostructures herald new opportunities for conducting fundamental nanoscience studies and developing nanoscale electronic/optoelectronic applications. This study presents a 1D ZnO nanowire (n‐type)–2D WSe2 nanosheet (p‐type) vdW heterojunction diode for photodetection and imaging process. After amorphous fluoropolymer passivation, the ZnO–WSe2 diode shows superior performance with a much‐enhanced rectification (ON/OFF) ratio of over 106 and an ideality factor of 3.4–3.6 due to the carbon–fluorine (CF) dipole effect. This heterojunction device exhibits spectral photoresponses from ultraviolet (400 nm) to near infrared (950 nm). Furthermore, a prototype visible imager is demonstrated using the ZnO–WSe2 heterojunction diode as an imaging pixel. To the best of our knowledge, this is the first demonstration of an optoelectronic device based on a 1D–2D hybrid vdW heterojunction. This approach using a 1D ZnO–2D WSe2 heterojunction paves the way for the further development of electronic/optoelectronic applications using mixed‐dimensional vdW heterostructures.
Integrated Quasiplane Heteronanostructures of MoSe2/Bi2Se3 Hexagonal Nanosheets: Synergetic Electrocatalytic Water Splitting and Enhanced Supercapacitor Performance
Authors: Yang Jing , Wang Chunde , Ju Huanxin , Sun Yuan , Xing Shiqi , Zhu Junfa , Yang Qing 
Published: November 2017

AbstractMoSe2 as a typical transition metal dichalcogenide holds great potential for energy storage and catalysis but its performance is largely limited by its poor conductivity. Bi2Se3 nanosheets, a kind of topological insulators, possess gapless edges on boundary and show metallic character on surface. According to the principle of complementary, a novel integrated quasiplane structure of MoSe2/Bi2Se3 hybrids is designed with artistic heteronanostructures via a hot injection in colloidal system. Interestingly, the heteronanostructures are typically constituted by single‐layer Bi2Se3 hexagonal nanoplates evenly enclosed by small ultrathin hierarchical MoSe2 nanosheets on the whole surfaces. X‐ray photoelectron spectroscopy investigations suggest obvious electron transfer from Bi2Se3 to MoSe2, which can help to enhance the conductivity of the hybrid electrode. Especially, schematic energy band diagrams derived from ultraviolet photoelectron spectroscopy studies indicate that Bi2Se3 has higher EF and smaller Φ than MoSe2, further confirming the electronic modulation between Bi2Se3 and MoSe2, where Bi2Se3 serves as an excellent substrate to provide electrons and acts as channels for high‐rate transition. The MoSe2/Bi2Se3 hybrids demonstrating a low onset potential, small Tafel slope, high current density, and long‐term stability suggest excellent hydrogen evolution reaction activity, whereas a high specific capacitance, satisfactory rate capability, and rapid ions diffusion indicate enhanced supercapacitor performance.
Nanofluidics: A New Arena for Materials Science
Authors: Xu Yan 
Published: November 2017

AbstractA significant growth of research in nanofluidics is achieved over the past decade, but the field is still facing considerable challenges toward the transition from the current physics‐centered stage to the next application‐oriented stage. Many of these challenges are associated with materials science, so the field of nanofluidics offers great opportunities for materials scientists to exploit. In addition, the use of unusual effects and ultrasmall confined spaces of well‐defined nanofluidic environments would offer new mechanisms and technologies to manipulate nanoscale objects as well as to synthesize novel nanomaterials in the liquid phase. Therefore, nanofluidics will be a new arena for materials science. In the past few years, burgeoning progress has been made toward this trend, as overviewed in this article, including materials and methods for fabricating nanofluidic devices, nanofluidics with functionalized surfaces and functional material components, as well as nanofluidics for manipulating nanoscale materials and fabricating new nanomaterials. Many critical challenges as well as fantastic opportunities in this arena lie ahead. Some of those, which are of particular interest, are also discussed.
“Electro‐Typing” on a Carbon‐Nanoparticles‐Filled Polymeric Film using Conducting Atomic Force Microscopy
Authors: Goswami Sumita , Nandy Suman , Banerjee Arghya Narayan , Kiazadeh Asal , Dillip Gowra Raghupathy , Pinto Joana V. , Joo Sang Woo , Martins Rodrigo , Fortunato Elvira 
Published: November 2017

AbstractNext‐generation electrical nanoimprinting of a polymeric data sheet based on charge trapping phenomena is reported here. Carbon nanoparticles (CNPs) (waste carbon product) are deployed into a polymeric matrix (polyaniline) (PANI) as a charge trapping layer. The data are recorded on the CNPs‐filled polyaniline device layer by “electro‐typing” under a voltage pulse (VET, from ±1 to ±7 V), which is applied to the device layer through a localized charge‐injection method. The core idea of this device is to make an electrical image through the charge trapping mechanism, which can be “read” further by the subsequent electrical mapping. The density of stored charges at the carbon–polyaniline layer, near the metal/polymer interface, is found to depend on the voltage amplitude, i.e., the number of injected charge carriers. The relaxation of the stored charges is studied by different probe voltages and for different devices, depending on the percolation of the CNPs into the PANI. The polymeric data sheet retains the recorded data for more than 6 h, which can be refreshed or erased at will. Also, a write–read–erase–read cycle is performed for the smallest “bit” of stored information through a single contact between the probe and the device layer.
Nanoparticulate Delivery of Cancer Cell Membrane Elicits Multiantigenic Antitumor Immunity
Authors: Kroll Ashley V. , Fang Ronnie H. , Jiang Yao , Zhou Jiarong , Wei Xiaoli , Yu Chun Lai , Gao Jie , Luk Brian T. , Dehaini Diana , Gao Weiwei , Zhang Liangfang 
Published: November 2017

AbstractAnticancer vaccines train the body's own immune system to recognize and eliminate malignant cells based on differential antigen expression. While conceptually attractive, clinical efficacy is lacking given several key challenges stemming from the similarities between cancerous and healthy tissue. Ideally, an effective vaccine formulation would deliver multiple tumor antigens in a fashion that potently stimulates endogenous immune responses against those antigens. Here, it is reported on the fabrication of a biomimetic, nanoparticulate anticancer vaccine that is capable of delivering autologously derived tumor antigen material together with a highly immunostimulatory adjuvant. The two major components, tumor antigens and adjuvant, are presented concurrently in a fashion that maximizes their ability to promote effective antigen presentation and activation of downstream immune processes. Ultimately, it is demonstrated that the formulation can elicit potent antitumor immune responses in vivo. When combined with additional immunotherapies such as checkpoint blockades, the nanovaccine demonstrates substantial therapeutic effect. Overall, the work represents the rational application of nanotechnology for immunoengineering and can provide a blueprint for the future development of personalized, autologous anticancer vaccines with broad applicability.
Oxygen Vacancies Dominated NiS2/CoS2 Interface Porous Nanowires for Portable Zn–Air Batteries Driven Water Splitting Devices
Authors: Yin Jie , Li Yuxuan , Lv Fan , Lu Min , Sun Ke , Wang Wei , Wang Lei , Cheng Fangyi , Li Yefei , Xi Pinxian , Guo Shaojun 
Published: November 2017

AbstractThe development of highly active and stable oxygen evolution reaction (OER) electrocatalysts is crucial for improving the efficiency of water splitting and metal–air battery devices. Herein, an efficient strategy is demonstrated for making the oxygen vacancies dominated cobalt–nickel sulfide interface porous nanowires (NiS2/CoS2–O NWs) for boosting OER catalysis through in situ electrochemical reaction of NiS2/CoS2 interface NWs. Because of the abundant oxygen vacancies and interface porous nanowires structure, they can catalyze the OER efficiently with a low overpotential of 235 mV at j = 10 mA cm−2 and remarkable long‐term stability in 1.0 m KOH. The home‐made rechargeable portable Zn–air batteries by using NiS2/CoS2–O NWs as the air–cathode display a very high open‐circuit voltage of 1.49 V, which can maintain for more than 30 h. Most importantly, a highly efficient self‐driven water splitting device is designed with NiS2/CoS2–O NWs as both anode and cathode, powered by two‐series‐connected NiS2/CoS2–O NWs‐based portable Zn–air batteries. The present work opens a new way for designing oxygen vacancies dominated interface nanowires as highly efficient multifunctional electrocatalysts for electrochemical reactions and renewable energy devices.
D–A–A‐Type Emitter Featuring Benzo[c][1,2,5]thiadiazole and Polar CN Bond as Tandem Acceptor for High‐Performance Near‐Infrared Organic Light‐Emitting Diodes
Authors: Wang Ya‐Kun , Wu Sheng‐Fan , Li Si‐Hua , Yuan Yi , Wu Fu‐Peng , Kumar Sarvendra , Jiang Zuo‐Quan , Fung Man‐Keung , Liao Liang‐Sheng 
Published: November 2017

AbstractThough urgently required, high performance near‐infrared (NIR) emitters are still rare given the challenge of obtaining high photoluminance quantum efficiency (PLQY) at the same time ensuring NIR emission. The major issue lies in the design strategy for which strong electron donating/withdrawing moieties with high PLQY should be integrated with a scrumptious way. Herein, a novel donor–acceptor–acceptor (D–A–A) type NIR emitter comprising highly polar cyano group (CN) together with rigid benzo[c][1,2,5]thiadiazole as tandem acceptor and 4,4′‐dimethyltriphenylamine as donor is successfully designed. This constructing strategy not only allows the D/A maintain their intrinsic electron‐donating/withdrawing characteristics, but also retains high PLQY. In merits of these features, excellent external quantum efficiency (EQE) of 3.8% with peak emission at 692 nm for 15% doped device is achieved. Encouragingly, impressive EQE of 3.1% with the peak emission at 708 nm is also successfully achieved without doping technique. It is believed that these efficiencies are the best or among the best comparing to those of the reported NIR organic light‐emitting diodes with similar electroluminescence peak. Notably, efficiency roll‐offs of both doped and nondoped device are also quite flat.
Bifunctional Pancharatnam‐Berry Metasurface with High‐Efficiency Helicity‐Dependent Transmissions and Reflections
Authors: Cai Tong , Wang Guang‐Ming , Xu He‐Xiu , Tang Shi‐Wei , Li Haipeng , Liang Jian‐Gang , Zhuang Ya‐Qiang 
Published: November 2017

AbstractManipulating circularly‐polarized (CP) waves in desired multi‐prescribed manners, especially in both transmission and reflection schemes, in a single flat device is of particular importance in photonic integration, imaging processing and communication systems. However, available approaches suffer from large thickness, low efficiencies as well as limited wavefront control spaces. Here, we propose a general strategy by using specially tailored Pancharatnam‐Berry (PB) meta‐atoms with helicity‐dependent transmissions and reflections to design high‐efficiency CP bifunctional metasurfaces. As a proof of the strategy, two metadevices are designed and characterized at microwave frequencies: the former one achieving focusing/diverging lenses at transmission/reflection side of the metasurface; the latter one realizing CP beam separation under illuminations of CP waves with different chirality, respectively. Both numerical and experimental results demonstrate the predicted EM functionalities, and all these functionalities exhibit very high efficiencies (88%∼94%). Our findings afford a new route to design high‐performance CP bi‐functional metasurfaces operating in other frequency domains or with other functionalities.
High‐Magnesium Calcite Mesocrystals: Formation in Aqueous Solution under Ambient Conditions
Authors: Yu Pao‐Tao , Tsao Chieh , Wang Chun‐Chieh , Chang Chun‐Yu , Wang Chia‐Hsin , Chan Jerry Chun Chung 
Published: November 2017

AbstractMesocrystals of high‐magnesian calcites are commonly found in biogenic calcites. Under ambient conditions, it remains challenging to prepare mesocrystals of high‐magnesian calcite in aqueous solution. We report that mesocrystals of calcite with magnesium content of about 20 mol % can be obtained from the phase transformation of magnesian amorphous calcium carbonate (Mg‐ACC) in lipid solution. The limited water content on the Mg‐ACC surface would reduce the extent of the dissolution–reprecipitation process and bias the phase transformation pathway toward solid‐state reaction. We infer from the selected area electron diffraction patterns and the dark‐field transmission electron microscopic images that the formation of Mg‐calcite mesocrystals occurs through solid‐state secondary nucleation, for which the phase transformation is initiated near the mineral surface and the crystalline phase propagates gradually toward the interior part of the microspheres of Mg‐ACC.
The MOF+ Technique: A Significant Synergic Effect Enables High Performance Chromate Removal
Authors: Luo Ming Biao , Xiong Yang Yang , Wu Hui Qiong , Feng Xue Feng , Li Jian Qiang , Luo Feng 
Published: November 2017

AbstractA significant synergic effect between a metal–organic framework (MOF) and Fe2SO4, the so‐called MOF+ technique, is exploited for the first time to remove toxic chromate from aqueous solutions. The results show that relative to the pristine MOF samples (no detectable chromate removal), the MOF+ method enables super performance, giving a 796 Cr mg g−1 adsorption capacity. The value is almost eight‐fold higher than the best value of established MOF adsorbents, and the highest value of all reported porous adsorbents for such use. The adsorption mechanism, unlike the anion‐exchange process that dominates chromate removal in all other MOF adsorbents, as unveiled by X‐ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), and transmission electron microscopy (TEM), is due to the surface formation of Fe0.75Cr0.25(OH)3 nanospheres on the MOF samples.
Sulfamate Esters Guide Selective Radical‐Mediated Chlorination of Aliphatic C−H Bonds
Authors: Short Melanie A. , Blackburn J. Miles , Roizen Jennifer L. 
Published: November 2017

AbstractMasked alcohols are particularly appealing as directing groups because of the ubiquity of hydroxy groups in organic small molecules. Herein, we disclose a general strategy for aliphatic γ‐C(sp3)−H functionalization guided by a masked alcohol. Specifically, we determine that sulfamate ester derived nitrogen‐centered radicals mediate 1,6‐hydrogen‐atom transfer (HAT) processes to guide γ‐C(sp3)−H chlorination. This reaction proceeds through a light‐initiated radical chain‐propagation process and is capable of installing chlorine atoms at primary, secondary, and tertiary centers.
Soy protein isolate nanocomposite film enriched with eugenol, an antimicrobial agent: Interactions and properties
Authors: Fernandes Nassar Samira , Dombre Clara , Gastaldi Emmanuelle , Touchaleaume François , Chalier Pascale 
Published: November 2017

ABSTRACTNanocomposites films were designed from soy protein isolates (SPI), clays (Na+‐MMT), and eugenol an antimicrobial agent. Interactions between Na+‐MMT and eugenol were evidenced by a shift of the d‐spacing by X‐ray diffraction analysis. The addition of Na+‐MMT (5 and 7.5% w/w) in SPI solution increased its shear thinning behavior and its consistency. Accordingly, a good exfoliation of clays in SPI films was observed. The glass transition temperature of SPI films was impacted by the clays addition but not the water vapor permeability. In contrast, the addition of eugenol in SPI solution did not affected the consistency but induced a decrease of the SPI film Tg and an increase of the water vapor permeability. The presence of eugenol counterbalanced the effect of clays on consistency of film‐forming solution. The clay intercalation process was facilitated and the water vapor permeability and active agent release were modified. The presence of clay did not affect the antibacterial effect of eugenol/SPI films. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018, 135, 45941.
Effects of nonionic surfactants and external factors on stability of latex in cement paste
Authors: Han Dongdong , Chen Weideng , Zhong Shiyun , He Yan 
Published: November 2017

ABSTRACTTo clarify why different surfactants affect stability of latex in cement paste and why many latexes qualified in standard stability test still coagulate when mixed with cement, several kinds of nonionic surfactants with different structures were selected to improve stability of latex and the interactions among cement, latex, and surfactant were discussed. Results show that a higher affinity of surfactant to polymer contributes to a higher stability of latex in cement paste. When surfactants have similar hydrophilic group with each other, surfactants with phenyl in hydrophobic group can more effectively improve stability of styrene–acrylate (SA) latex in cement paste than that with n‐alkyl. With the same hydrophobic group (octyl phenyl) in molecules, surfactants with shorter hydrophilic group show better stabilization effect on SA latex. The combined action of high Ca2+ concentration, high solid concentration, and mechanical shear during agitation process of cement paste is the decisive factor causing coagulation of latex. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018, 135, 45946.
Nanofibrous nonwovens based on dendritic‐linear‐dendritic poly(ethylene glycol) hybrids
Authors: Kikionis Stefanos , Ioannou Efstathia , Andrén Oliver C. J. , Chronakis Ioannis S. , Fahmi Amir , Malkoch Michael , Toskas Georgios , Roussis Vassilios 
Published: November 2017

ABSTRACTDendritic‐linear‐dendritic (DLD) hybrids are highly functional materials combining the properties of linear and dendritic polymers. Attempts to electrospin DLD polymers composed of hyperbranched dendritic blocks of 2,2‐bis(hydroxymethyl) propionic acid on a linear poly(ethylene glycol) core proved unsuccessful. Nevertheless, when these DLD hybrids were blended with an array of different biodegradable polymers as entanglement enhancers, nanofibrous nonwovens were successfully prepared by electrospinning. The pseudogeneration degree of the DLDs, the nature of the co‐electrospun polymer and the solvent systems used for the preparation of the electrospinning solutions exerted a significant effect on the diameter and morphology of the electrospun fibers. It is worth‐noting that aqueous solutions of the DLD polymers and only 1% (w/v) poly(ethylene oxide) resulted in the production of smoother and thinner nanofibers. Such dendritic nanofibrous scaffolds can be promising materials for biomedical applications due to their biocompatibility, biodegradability, multifunctionality, and advanced structural architecture. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018, 135, 45949.
Zum Torsionstragverhalten extern vorgespannter Kreissegmente mit trockenen Fugen
Authors: Hartwig Steffen , Marx Steffen 
Published: November 2017

AbstractIm Turmbau von Windenergieanlagen haben sich insbesondere bei großen Turmhöhen Beton‐ oder Hybridtürme etabliert, welche durch ihre bessere Transportfähigkeit die traditionellen Stahltürme abgelöst haben. Speziell die Fertigteilbauweise bringt jedoch aufgrund der erforderlichen Fugen Fragestellungen mit sich, welche durch die derzeitigen Modelle und Berechnungsansätze nicht zufriedenstellend gelöst werden. Bei der Ausbildung sogenannter Trockenfugen (Horizontalfugen) zwischen den Segmenten erfolgt die Kraftübertragung der Querkräfte und Torsionsmomente ausschließlich über die Reibung in der Fuge, wobei der Reibwiderstand durch die externe Vorspannung und den Reibbeiwert erzeugt wird. Die Querkrafttragfähigkeit in der Fuge ermittelt sich über einen linearen Ansatz, wonach die zulässige Querkraft der Vorspannkraft, multipliziert mit dem Reibbeiwert, entspricht. Für die Übertragung der Torsionsmomente erfolgt die Berechnung nach den bekannten Torsionstheorien nach Bredt und Saint‐Venant, wonach die Fuge, solange diese überdrückt ist, ein sehr großes Torsionsmoment übertragen kann. Kommt es jedoch im Grenzzustand der Tragfähigkeit zum Aufklaffen der Fuge, fällt das zulässige Moment um ein Vielfaches ab und wird somit zu einem Grenzkriterium in der Bemessung des Turms. Nach aktuellen Untersuchungen beschreiben diese Ansätze das Trag‐ und Verformungsverhalten einer solchen Fuge unzutreffend, woraus sich in der Bemessung sowohl ein Unsicherheitsbereich, aber auch ein sehr großes ungenutztes Potenzial ergibt.
Filigrane Betonschalen am Hauptbahnhof in Berlin
Authors: Paech Christoph , Burkhardt Uwe , Schlaich Mike 
Published: November 2017

AbstractAm Berliner Hauptbahnhof entstand im Zuge der Straßenbahnverlängerung ein wichtiger Umsteigepunkt. Zwei langgestreckte, geschwungene Stahlbetonschalen überdachen die neue Haltestelle. Die Form der beiden jeweils 58 m langen und 6 m breiten symmetrischen Dächer entwickelt sich aus den zentral angeordneten, vertikalen Fahrtreppenschachtwänden, die zur geplanten unterirdischen S‐Bahnstation führen. Die weit auskragenden Dächer werden am äußeren Rand zusätzlich in einzelnen Punkten von dünnen Stahlstützen getragen. Durch die sehr komplexen Randbedingungen waren nicht nur der Entwurf und die Bemessung der Dächer eine Herausforderung, sondern auch die sichere und setzungsarme Gründung des Bauwerks.Die Krümmung der Dachfläche ermöglicht ein Schalentragverhalten, bei dem Biegemomente weitgehend minimiert werden. Durch den Einsatz eines hochfesten Leichtbetons (LC45/50 nach DIN EN 1992) in Kombination mit einer nichtrostenden Betonstahl‐Bewehrung konnte eine schlanke Betonschale mit einer Dicke von lediglich sieben Zentimetern in den Randbereichen umgesetzt werden. Im Folgenden wird auf den Entwurf und die konstruktiv schwierige und nicht unproblematische Ausführung eingegangen.