bluuebunny/crossref_metadata_2025_split huggingface dataset:
Conductive CoOOH as Carbon‐Free Sulfur Immobilizer to Fabricate Sulfur‐Based Composite for Lithium–Sulfur Battery
Authors: Wang Zhen‐Yu , Wang Lu , Liu Sheng , Li Guo‐Ran , Gao Xue‐Ping 
Published: April 2019

AbstractLithium–sulfur battery is recognized as one of the most promising energy storage devices, while the application and commercialization are severely hindered by both the practical gravimetric and volumetric energy densities due to the low sulfur content and tap density with lightweight and nonpolar porous carbon materials as sulfur host. Herein, for the first time, conductive CoOOH sheets are introduced as carbon‐free sulfur immobilizer to fabricate sulfur‐based composite as cathode for lithium–sulfur battery. CoOOH sheet is not only a good sulfur‐loading matrix with high electron conductivity, but also exhibits outstanding electrocatalytic activity for the conversion of soluble lithium polysulfide. With an ultrahigh sulfur content of 91.8 wt% and a tap density of 1.26 g cm−3, the sulfur/CoOOH composite delivers high gravimetric capacity and volumetric capacity of 1199.4 mAh g−1‐composite and 1511.3 mAh cm−3 at 0.1C rate, respectively. Meanwhile, the sulfur‐based composite presents satisfactory cycle stability with a slow capacity decay rate of 0.09% per cycle within 500 cycles at 1C rate, thanks to the strong interaction between CoOOH and soluble polysulfides. This work provides a new strategy to realize the combination of gravimetric energy density, volumetric energy density, and good electrochemical performance of lithium–sulfur battery.
Bioprinting a Synthetic Smectic Clay for Orthopedic Applications
Authors: Afewerki Samson , Magalhães Leila S. S. M. , Silva André D. R. , Stocco Thiago D. , Silva Filho Edson C. , Marciano Fernanda R. , Lobo Anderson O. 
Published: April 2019

AbstractBioprinting technology has emerged as an important approach to bone and cartilage tissue engineering applications, because it allows the printing of scaffolds loaded with various components, such as cells, growth factors, or drugs. In this context, the bone has a very complex architecture containing highly vascularized and calcified tissues, while cartilage is avascular and has low cellularity and few nutrients. Owing to this complexity, the repair and regeneration of these tissues are highly challenging. Identification of the appropriate biomaterial and fabrication technologies can provide sustainable solutions to this challenge. Here, nanosized Laponite® (Laponite is a trademark of the company BYK Additives Ltd.) has shown to be a promising material due to its unique properties such as excellent biocompatibility, facile gel formation, shear‐thinning property (reversible physical crosslinking), high specific surface area, degrade into nontoxic products, and with osteoinductive properties. Even though Laponite and Laponite‐based composite for 3D bioprinting application are considered as soft gels, they may therefore not be thought exhibiting sufficient mechanical strength for orthopedic applications. However, through the merging with suitable composite and, also by incorporation of crosslinking step, desired mechanical strength for orthopedic application can be obtained. In this review, recent advances and future perspective of bioprinting Laponite and Laponite composites for orthopedic applications are highlighted.
Interfacial Electronic Structure Modulation of NiTe Nanoarrays with NiS Nanodots Facilitates Electrocatalytic Oxygen Evolution
Authors: Xue Ziqian , Li Xia , Liu Qinglin , Cai Mengke , Liu Kang , Liu Min , Ke Zhuofeng , Liu Xialin , Li Guangqin 
Published: April 2019

AbstractInterface engineering has been recognized as one of the most promising strategies for regulating the physical and chemical properties of materials. However, constructing well‐defined nanointerfaces with efficient oxygen evolution reaction (OER) still remains a challenge. Herein, cross columnar NiTe nanoarrays supported on nickel foam are prepared. Subsequently, NiTe/NiS nanointerfaces are constructed by an ion‐exchange process. Importantly, the electrocatalytic performance for the OER can be facilitated by coupling NiTe and NiS. As a result, NiTe/NiS shows excellent OER activity with an ultralow overpotential of only 257 mV at a current density of 100 mA cm−2, and a Tafel slope of 49 mV dec−1 in 1.0 m KOH. The calculated and experimental results reveal that the strong electron interaction on nanointerfaces induces electronic structure modulation, which optimizes the binding energy of *OOH intermediates, thus improving the OER performance.
Giant Enhancements of Perpendicular Magnetic Anisotropy and Spin‐Orbit Torque by a MoS2 Layer
Authors: Xie Qidong , Lin Weinan , Yang Baishun , Shu Xinyu , Chen Shaohai , Liu Liang , Yu Xiaojiang , Breese Mark B. H. , Zhou Tiejun , Yang Ming , Zhang Zheng , Wang Shijie , Yang Hongxin , Chai Jianwei , Han Xiufeng , Chen Jingsheng 
Published: April 2019

Abstract2D transition metal dichalcogenides have attracted much attention in the field of spintronics due to their rich spin‐dependent properties. The promise of highly compact and low‐energy‐consumption spin‐orbit torque (SOT) devices motivates the search for structures and materials that can satisfy the requirements of giant perpendicular magnetic anisotropy (PMA) and large SOT simultaneously in SOT‐based magnetic memory. Here, it is demonstrated that PMA and SOT in a heavy metal/transition metal ferromagnet structure, Pt/[Co/Ni]2, can be greatly enhanced by introducing a molybdenum disulfide (MoS2) underlayer. According to first‐principles calculation and X‐ray absorption spectroscopy (XAS), the enhancement of the PMA is ascribed to the modification of the orbital hybridization at the interface of Pt/Co due to MoS2. The enhancement of SOT by the role played by MoS2 is explained, which is strongly supported by the identical behavior of SOT and PMA as a function of Pt thickness. This work provides new possibilities to integrate 2D materials into promising spintronics devices.
Dielectric Selection for Solution‐Processed High‐Mobility TIPS‐Pentacene Microwire Field‐Effect Transistors
Authors: Wang Shuya , Zhou Shujun , Tong Yanhong , Song Zhiqi , Wang Haiting , Tang Qingxin , Zhao Xiaoli , Liu Yichun 
Published: April 2019

AbstractThe dielectric effect on the mobility of the solution‐processed organic field‐effect transistors (OFETs) remains unknown. A major challenge is that most of the solution‐processed OFETs are obtained on hydrophilic dielectrics, while most of the commonly used dielectrics for high‐mobility OFETs are hydrophobic. In this work, by selecting a preferred solvent to ensure the good wettability of 6,13‐bis(triisopropylsilylethynyl)‐pentacene (TIPS‐pentacene) solution on both hydrophobic and hydrophilic dielectrics, the highly ordered TIPS‐pentacene single‐crystal microwire arrays are in situ grown on the hydrophobic and hydrophilic dielectrics via a solution‐processed method, and the dielectric effect on the mobility of the solution‐processed TIPS‐pentacene OFETs is investigated. The highest mobility on the divinyltetramethyldisiloxane‐bis(benzocyclobutene) (BCB)/SiO2 dielectric is ascribed to the matching of both the polar and dispersive components of surface energy between dielectric and semiconductor. This work powerfully confirms the direct effect of the dielectric properties on mobility, and provides a new method to select the optimized dielectric for solution‐processed high‐mobility OFETs.
A Sulfone‐Containing Imidazolium‐Based Brønsted Acid Ionic Liquid Catalyst Enables Replacing Dipolar Aprotic Solvents with Butyl Acetate
Authors: El‐Harairy Ahmed , Yiliqi  , Lai Bingbing , Vaccaro Luigi , Li Minghao , Gu Yanlong 
Published: April 2019

AbstractReplacing dipolar and aprotic solvents with environmentally benign media has emerged as a new facet of green chemistry. In this paper, a sulfone‐containing imidazolium‐based Brønsted acid ionic liquid was prepared and used as a recyclable acid catalyst. The ionic liquid catalyst enables the use of an industrially acceptable and environmentally benign solvent, butyl acetate, as the reaction medium. The ionic liquid/butyl acetate biphasic system was successfully utilized in many organic reactions, which generally relied heavily on dipolar and aprotic solvents.magnified image
Reversible Modification of Ferromagnetism through Electrically Controlled Morphology
Authors: Vinai Giovanni , Motti Federico , Bonanni Valentina , Petrov Aleksander Yu. , Benedetti Stefania , Rinaldi Christian , Stella Mattia , Cassese Damiano , Prato Stefano , Cantoni Matteo , Rossi Giorgio , Panaccione Giancarlo , Torelli Piero 
Published: April 2019

AbstractConverse magnetoelectric coupling in artificial multiferroics is generally modeled through three possible mechanisms: charge transfer, strain mediated effects or ion migration. Here the role played by electrically controlled morphological modifications on the ferromagnetic response of a multiferroic heterostructure, specifically FexMn1−x ferromagnetic films on piezoferroelectric PMN‐PT [001] substrates, is discussed. The substrates present, in correspondence to electrical switching, fully reversible morphological changes at the surface, to which correspond reproducible modifications of the ferromagnetic response of the FexMn1−x films. Topographic analysis by atomic force microscopy shows the formation of surface cracks (up to 100 nm in height) upon application of a sufficiently high positive electric field (up to 6 kV cm−1). The cracks disappear after application of negative electric field of the same magnitude. Correspondingly, in operando X‐ray magnetic circular dichroic spectroscopy at Fe edge in FexMn1−x layers and micro‐MOKE measurements show local variations in the intensity of the dichroic signal and in the magnetic anisotropy as a function of the electrically driven morphological state. This morphologic parameter, rarely explored in literature, directly affects the ferromagnetic response of the system. Its proof of electrically reversible modification of the magnetic response adds a new possibility in the design of electrically controlled magnetic devices.
Realizing Ultrafast Oxygen Evolution by Introducing Proton Acceptor into Perovskites
Authors: She Sixuan , Zhu Yinlong , Chen Yubo , Lu Qian , Zhou Wei , Shao Zongping 
Published: April 2019

AbstractThe oxygen evolution reaction (OER) is of prime importance in multiple energy storage devices. Perovskite oxides involving lattice‐oxygen oxidation are generally regarded as highly active OER catalysts, but the deprotonation of surface‐bound intermediates limit the further activity improvement. Here, it is shown that this kinetic limitation can be removed by introducing Sr3B2O6 (SB) which activates a proton‐acceptor functionality to boost OER activity. As a proof‐of‐concept example, an experimental validation is conducted on the extraordinary OER performance of a Sr(Co0.8Fe0.2)0.7B0.3O3−δ (SCFB‐0.3) hybrid catalyst, made using Sr0.8Co0.8Fe0.2O3−δ as active component and SB as a proton acceptor. This smart hybrid exhibits an exceptionally ultrahigh OER activity with an extremely low overpotential of 340 mV in 0.1 m KOH and 240 mV in 1 m KOH required for 10 mA cm−2 which is the top‐level catalytic activity among metal oxides reported so far, while maintaining excellent durability. The correlation of pH and activity study reveals that this enhanced activity mainly originates from the improved interfacial proton transfer. Such a strategy further demonstrated to be universal, which can be applied to enhance the OER activity of other high covalent oxides with close O 2p‐band centers relative to Fermi energy.
A parametric study of the techno‐economics of direct CO2 air capture systems using solid adsorbents
Authors: Sinha Anshuman , Realff Matthew J. 
Published: April 2019

AbstractDirect air capture (DAC) can help in reduction of atmospheric CO2 levels by capturing CO2 from disperse emission sources. We analyze DAC process through solid adsorbent and perform comprehensive energy and techno‐economic analysis for different parametric scenarios. The parameters are varied such that it reflects list of possible cases of DAC solid adsorbent systems ranging from worst case to best case situations. A mid‐range estimate has also been analyzed which considers the parameter values feasible with the current state of the art. The modeling results for the mid‐range estimate indicate that the cost of DAC lies between $86 and 221 per tCO2, the thermal energy range varies from 3.4 to 4.8 GJ per tCO2 captured and the electrical energy range varies from 0.55 to 1.12 GJ per tCO2 captured. For the best and worst case scenarios, the cost of DAC ranges from $14 to 1,065 per tCO2, thermal energy ranges from 1.85 to 19.30 per tCO2 captured and the electrical energy ranges from 0.08 to 3.79 GJ per tCO2 captured. Flux and intensity estimates have been performed which shows higher flux and lower intensity of DAC process as compared to a tropical tree.
Multiscale model based design of an energy‐intensified novel adsorptive reactor process for the water gas shift reaction
Authors: Karagöz Seçgin , Chen Huanhao , Cao Mingyuan , Tsotsis Theodore T. , Manousiouthakis Vasilios I. 
Published: April 2019

AbstractIn this work, an adsorptive reactor (AR) process is considered that can energetically intensify the water gas shift reaction (WGSR). To best understand AR process behavior, a multiscale, dynamic, process model is developed. This multiscale model enables the quantification of catalyst and adsorbent effectiveness factors within the reactor environment, obliviating the commonly employed assumption that these factors are constant. Simulations of the AR's alternating adsorption‐reaction/desorption operation, using the proposed model, illustrate rapid convergence to a long‐term periodic solution. The obtained simulation results quantify the influence of key operating conditions and design parameters (e.g., reactor temperature/pressure, Wcat/FCO, Wad/FCO, FH2O/FCO ratios, and pellet size) on the AR's behavior. They also demonstrate, for pellet diameters used at the industrial scale, significant temporal and axial variation of the catalyst/adsorbent pellet effectiveness factors. Finally, the energetic intensification benefits of the proposed AR process over conventional WGSR packed‐bed reactors are quantified.
Copper‐Mediated Direct and Selective C−H Thiolation of Quinazolinones
Authors: Sarkar Writhabrata , Mishra Aniket , Bhowmik Arup , Deb Indubhusan 
Published: April 2019

AbstractDirect thiolation of quinazolinones by selective cleavage of a relatively inert C−H bond, mediated by earth‐abundant copper and guided by a pyridine or pyrimidine moiety, has been achieved under operationally simple conditions. The devised protocol does not require any toxic or reactive reagents and provides direct access to a broad spectrum of pharmaceutically relevant thioquinazolinones.
Eine intrinsische Hydrophobieskala für Aminosäuren und ihre Anwendung auf fluorierte Verbindungen
Authors: Hoffmann Waldemar , Langenhan Jennifer , Huhmann Susanne , Moschner Johann , Chang Rayoon , Accorsi Matteo , Seo Jongcheol , Rademann Jörg , Meijer Gerard , Koksch Beate , Bowers Michael T. , von Helden Gert , Pagel Kevin 
Published: April 2019

AbstractEs existieren über 100 Hydrophobieskalen für Aminosäuren, die auf unterschiedlichen Ansätzen basieren und einheitlich in kondensierter Phase ermittelt werden. Ein Vergleich der Hydrophobiewerte aus verschiedenen Methoden und die Ermittlung ihrer relativen Rangfolge sind jedoch anspruchsvoll, da die Wechselwirkungen zwischen der Umgebung und der Aminosäure in jeder Methode spezifisch sind. Hier überwinden wir diese Einschränkung, indem wir die Eigenschaften von Aminosäuren in der Reinraumumgebung der Gasphase untersuchen. In der Gasphase bleiben standardmäßig entropische Beiträge des hydrophoben Effektes aus, und nur die Polarität der Seitenkette ist für die Selbstorganisation entscheidend. Dies ermöglicht die Ableitung einer neuartigen Hydrophobieskala, die ausschließlich auf der Interaktion einzelner Aminosäureeinheiten innerhalb des Clusters basiert und somit die Eigenschaften der Seitenketten besser abbildet. Dieses Prinzip kann für die Klassifizierung von nicht‐natürlichen Derivaten angewendet werden, wie hier für fluorierte Aminosäurevarianten gezeigt ist.
Highly Enantioselective Synthesis of Fused Tri‐ and Tetrasubstituted Aziridines: aza‐Darzens Reaction of Cyclic Imines with α‐Halogenated Ketones Catalyzed by Bifunctional Phosphonium Salt
Authors: Pan Jianke , Wu Jia‐Hong , Zhang Hongkui , Ren Xiaoyu , Tan Jian‐Ping , Zhu Lixiang , Zhang Hong‐Su , Jiang Chunhui , Wang Tianli 
Published: April 2019

AbstractThe first enantioselective aza‐Darzens reaction of cyclic imines with α‐halogenated ketones was realized under mild reaction conditions by using amino‐acid‐derived bifunctional phosphonium salts as phase‐transfer promoters. A variety of structurally dense tri‐ and tetrasubstituted aziridine derivatives, containing benzofused heterocycles as well as spiro‐structures, were readily synthesized in high yields with excellent diastereo‐ and enantioselectivities (up to >20:1 d.r. and >99.9 % ee). The highly functionalized aziridine products could be easily transformed into different classes of biologically active compounds.
Synthesis of CuS@CoS2 Double‐Shelled Nanoboxes with Enhanced Sodium Storage Properties
Authors: Fang Yongjin , Guan Bu Yuan , Luan Deyan , Lou Xiong Wen (David) 
Published: April 2019

AbstractMetal sulfides have received considerable attention for efficient sodium storage owing to their high capacity and decent redox reversibility. However, the poor rate capability and fast capacity decay greatly hinder their practical application in sodium‐ion batteries. Herein, an elegant multi‐step templating strategy has been developed to rationally synthesize hierarchical double‐shelled nanoboxes with the CoS2 nanosheet‐constructed outer shell supported on the CuS inner shell. Their structure and composition enable these hierarchical CuS@CoS2 nanoboxes to show boosted electrochemical properties with high capacity, outstanding rate capability, and long cycle life.
A Concise Total Synthesis of (−)‐Himalensine A
Authors: Chen Yuye , Hu Jingping , Guo Lian‐Dong , Zhong Weihe , Ning Chengqing , Xu Jing 
Published: April 2019

AbstractThe daphniphyllum alkaloids are a structurally fascinating and remarkably diverse family of natural products. General strategies for the chemical synthesis of their challenging architectures are highly desirable for efficiently accessing these intriguing alkaloids and addressing their pharmaceutical potential. Herein, a concise strategy designed to provide general and diversifiable access to various daphniphyllum alkaloids is described and utilized in the asymmetric synthesis of (−)‐himalensine A, which was accomplished in 14 steps. Key features of this strategy include a Cu‐catalyzed nitrile hydration, a Heck reaction to construct the challenging 2‐azabicyclo[3.3.1]nonane motif, a Meinwald rearrangement reaction, six, pot‐economic reactions, and the minimal use of protecting groups, which significantly improved the overall synthetic efficiency.
Bullet‐like Cu9S5 Hollow Particles Coated with Nitrogen‐Doped Carbon for Sodium‐Ion Batteries
Authors: Fang Yongjin , Yu Xin‐Yao , Lou Xiong Wen (David) 
Published: April 2019

AbstractMetal sulfides with excellent redox reversibility and high capacity are very promising electrode materials for sodium‐ion batteries. However, their practical application is still hindered by the poor rate capability and limited cycle life. Herein, a template‐based strategy is developed to synthesize nitrogen‐doped carbon‐coated Cu9S5 bullet‐like hollow particles starting from bullet‐like ZnO particles. With the structural and compositional advantages, these unique nitrogen‐doped carbon‐coated Cu9S5 bullet‐like hollow particles manifest excellent sodium storage properties with superior rate capability and ultra‐stable cycling performance.
Structural Evolution and Effect of the Neighboring Cation on the Photoluminescence of Sr(LiAl3)1−x(SiMg3)xN4:Eu2+ Phosphors
Authors: Fang Mu‐Huai , Mahlik Sebastian , Lazarowska Agata , Grinberg Marek , Molokeev Maxim S. , Sheu Hwo‐Shuenn , Lee Jyh‐Fu , Liu Ru‐Shi 
Published: April 2019

AbstractIn this study, a series of Sr(LiAl3)1−x(SiMg3)xN4:Eu2+ (SLA‐SSM) phosphors were synthesized by a solid‐solution process. The emission peak maxima of SLA‐SSM range from 615 nm to 680 nm, which indicates structural differences in these materials. 7Li solid‐state NMR spectroscopy was utilized to distinguish between the Li(1)N4 and Li(2)N4 tetrahedra in SLA‐SSM. Differences in the coordination environments of the two Sr sites were found which explain the unexpected luminescent properties. Three discernible morphologies were detected by scanning electron microscopy. Temperature‐dependent photoluminescence and decay times were used to understand the diverse environments of europium ions in the two strontium sites Sr1 and Sr2, which also support the NMR analysis. Moreover, X‐ray absorption near‐edge structure studies reveal that the Eu2+ concentration in SLA‐SSM is much higher than that in in SrLiAl3N4:Eu2+ and SrSiMg3N4:Eu2+ phosphors. Finally, an overall mechanism was proposed to explain the how the change in photoluminescence is controlled by the size of the coordinated cation.
Design of Photostable, Activatable Near‐Infrared Photoacoustic Probes Using Tautomeric Benziphthalocyanine as a Platform
Authors: Toriumi Naoyuki , Asano Norihito , Ikeno Takayuki , Muranaka Atsuya , Hanaoka Kenjiro , Urano Yasuteru , Uchiyama Masanobu 
Published: April 2019

AbstractNear‐infrared (NIR) imaging techniques have attracted significant attention for biological and medicinal applications due to the ability of NIR to penetrate deeply into tissues. However, there are very few stable, activatable molecular probes that can utilize NIR light in the wavelength range beyond 800 nm. Herein, we report a new activatable NIR system for photoacoustic imaging based on tautomeric benziphthalocyanines (BPcs). We found that the existence of a free hydroxyl group is crucial for NIR absorption of BPcs. Synthesized water‐soluble hydroxy BPcs exhibited high photostability and no fluorescence, which are desirable features for photoacoustic imaging. We synthesized BPcs in which the free hydroxyl group was masked by an esterase‐labile or an H2O2‐labile group. The photoacoustic signals of these hydroxy‐masked BPcs were increased upon NIR excitation at 880 nm in the presence of esterase or H2O2, respectively. These are rare examples of activatable probes utilizing NIR light at around 900 nm.
Activation and Spillover of Hydrogen on Sub‐1 nm Palladium Nanoclusters Confined within Sodalite Zeolite for the Semi‐Hydrogenation of Alkynes
Authors: Wang Shuai , Zhao Zhi‐Jian , Chang Xin , Zhao Jiubing , Tian Hao , Yang Chengsheng , Li Mingrun , Fu Qiang , Mu Rentao , Gong Jinlong 
Published: April 2019

AbstractThe search for efficient nontoxic catalysts able to perform industrial hydrogenations is a topic of interest, with relevance to many catalytic processes. Herein, we describe a mechanistic phenomenon for the activation and spillover of hydrogen for remarkable selectivity in the semi‐hydrogenation of acetylene over sub‐1 nm Pd nanoclusters confined within sodalite (SOD) zeolite (Pd@SOD). Specifically, hydrogen is dissociated on the Pd nanoclusters to form hydrogen species (i.e., hydrogen atoms and hydroxyl groups) that spill over the SOD surfaces. The design and utilization of the small‐pore zeolite SOD (six‐membered rings with 0.28×0.28 nm channels) is crucial as it only allows H2 diffusion into the channels to reach the encapsulated Pd nanoclusters and thus avoids over‐hydrogenation to form ethane. Pd@SOD exhibits an ethylene selectivity of over 94.5 %, while that of conventional Pd/SOD is approximately 21.5 %.