bluuebunny/crossref_metadata_2025_split huggingface dataset:
Enhanced Two‐Photon‐Pumped Emission from In Situ Synthesized Nonblinking CsPbBr3/SiO2 Nanocrystals with Excellent Stability
Authors: Hu Zhiping , Liu Zhengzheng , Bian Yao , Li Shiqi , Tang Xiaosheng , Du Juan , Zang Zhigang , Zhou Miao , Hu Wei , Tian Yuxi , Leng Yuxin 
Published: December 2017

AbstractPerovskites have emerged as a class of cutting‐edge photovoltaic and light‐emitting materials. However, poor stability due to high moisture sensitivity and undesirable blinking severely limits their further application. Here, to solve these problems without destroying optoelectronic performance, a simple process for the fabrication of nonblinking CsPbBr3 quantum dots (QDs) is investigated. By embedding CsPbBr3 QDs into waterless silica spheres, the blinking of QDs can be strikingly suppressed, with an effective improvement of the moisture resistance and enhanced photostability. The silica sphere can also prevent anion exchange of different halide elements between perovskite QDs. Ultrastable amplified spontaneous emission (ASE) from QDs/SiO2 with no degradation for at least 12 h is observed under continuous laser irradiation (4 × 107 continuous intense laser shots), with almost no ASE degradation evident after 60 d of storage under ambient conditions. Most notably, the ASE threshold (Pth) of CsPbBr3 QDs is decreased by 50% and the relative efficiency increased by 388%. The perovskite QDs coated by the waterless SiO2 shell provide a novel platform for realizing perovskite nanomaterials with improved operational stability, nonblinking properties, and enhanced emission all at the same time, which is especially attractive for photovoltaic and light‐emitting device applications.
Magnetochromic Photonic Hydrogel for an Alternating Magnetic Field‐Responsive Color Display
Authors: Wang Wentao , Fan Xiaoqiao , Li Feihu , Qiu Jinjing , Umair Malik Muhammad , Ren Wenchen , Ju Benzhi , Zhang Shufen , Tang Bingtao 
Published: December 2017

AbstractAs an external stimulus for stimuli‐responsive chromic materials, a magnetic field has the benefits of contactless control, instant action, and ease of integration into electronic devices. Hence, the development of a magnetically responsive photonic crystal provides a new platform for color displays. However, magnetically controlled display systems have been primarily limited to liquid systems of colloidal crystals; their application to solid chromic systems has been difficult because the ordered array structure is fixed by a polymer network. A novel solid magnetochromic photonic hydrogel is developed that enables colorimetric responses to an alternating magnetic field (AMF). This notable magnetochromic performance is attributed to the superior magnetothermal effect of 1D aggregates of magnetic chains fixed in a thermosensitive hydrogel. The AMF‐responsive magnetic hydrogel exhibits excellent stability for repeated use. This study presents a basis for the development of responsive solid materials with new optical effects for future chromatic applications.
Single Source Precursor Chemical Vapor Decomposition Method to Fabricate Stable, Bright Emissive Aluminum Hydroxide Phosphors for UV‐Pumped White Light‐Emitting Devices
Authors: Chen Bingkun , Xu Xingjian , Zou Shuangyang , Wang Yongtian , Zou Bingsuo , Zhong Haizheng , Rogach Andrey L. 
Published: December 2017

AbstractAluminum hydroxides are considered to be a potential abundant, low‐cost blue emissive material to construct UV‐pumped white light‐emitting diodes (WLEDs). In this work, a single‐source precursor chemical vapor decomposition method is adapted to fabricate stable, strongly emissive aluminum hydroxide phosphors with photoluminescence quantum yield of up to 69% in solid state by thermal decomposing aluminum diacetate hydroxide (Al(OH)(Ac)2) at temperatures (260–360 °C) in N2 atmosphere. It exhibits layered, amorphous structure and its emission of aluminum hydroxide is enhanced by electron‐donating surface hydroxyl groups and originates from F+ centers and carbon‐related defects contributing to UV (388 nm) and blue (450–520 nm) spectral regions, respectively. Employing the as‐fabricated aluminum hydroxides as blue phosphor and CuInS2 nanocrystals as red phosphor, high color rendering and high‐efficiency WLEDs with luminous efficiencies up to 37 lm W−1 and high color rendering index of 91 are fabricated. This is the best performance reported so far for aluminum hydroxide based LEDs.
Visible Light‐Induced Synthetic Approach for Selenylative Spirocyclization of N‐Aryl Alkynamides with Molecular Oxygen as Oxidant
Authors: Sahoo Harekrishna , Mandal Anup , Dana Suman , Baidya Mahiuddin 
Published: December 2017

AbstractA visible light‐induced (blue LED) radical cascade has been devised to effect selenylative spirocyclization of N‐aryl alkynamides at room temperature under oxygen atmosphere and without the aid of external photocatalyst. The protocol is operationally simple, scalable, and offers clean synthesis of 3‐selenospiro[4,5]trienones in high yields (up to 92%). A novel spiro‐ring‐opening strategy has also been accomplished to access fully substituted acryl amides.magnified image
Charge Transfer Kinetics of Photo‐Electrochemical Hydrogen Evolution Improved by Nonstoichiometric Ni‐rich NiOx‐Coated Si Photocathode in Alkaline Electrolyte
Authors: Jung Jin‐Young , Yu Jin‐Young , Yoon Sanghwa , Yoo Bongyoung , Lee Jung‐Ho 
Published: December 2017

AbstractThe integration of electrocatalyst (EC) with light‐absorbing semiconductor photoelectrode is regarded as a representative framework for photoelectrochemical (PEC) devices. When considering the charge transfer pathways, PEC performance is governed by the charge kinetics at the EC/electrolyte and the semiconductor/EC interfaces. Here, systematic investigations are reported, made on the overall kinetics of the PEC hydrogen evolution reaction (HER) in an alkaline electrolyte. A non‐stoichiometric (Ni‐rich) NiOx (x < 1) EC is deposited on a Si photocathode passivated with a SiOx layer. A few distinctive features of the Ni‐rich NiOx film are identified in contrast with the conventional O‐rich NiOy (y ≥ 1) which could lower the series resistance along the charge transfer pathways. The Ni‐rich NiOx is found to possess both NiO and NiNi (by oxygen‐vacancy) bonds, which act as suitable catalytic sites for dissociating water molecules and recombining two hydrogen atoms, respectively. In addition, the Ni‐rich NiOx reveals both n‐type and metallic conduction behavior, a feature that may contribute to lowering bulk resistance as well as tunneling resistance through SiOx layer. As a result, this noble metal‐free EC‐integrated Si photocathode achieves the highest potential of 0.41 V vs. reversible hydrogen electrode to produce a photocurrent density of 10 mA cm2.
A Robust CuCr2O4/SiO2 Composite Photothermal Material with Underwater Black Property and Extremely High Thermal Stability for Solar‐Driven Water Evaporation
Authors: Shi Yusuf , Li Renyuan , Shi Le , Ahmed Elaf , Jin Yong , Wang Peng 
Published: December 2017

AbstractThe design and fabrication of efficient photothermal materials is the key issue in solar‐driven water evaporation. In this work, a robust CuCr2O4/SiO2 composite membrane with outstanding solar‐driven water evaporation performance (1.32 kg m−2 h−1) under one sun irradiation is rationally designed and synthesized by using quartz glass fibrous membrane as supporting matrix and stable CuCr2O4 particles as the active light absorber. Instead of coating a separate layer on top of the support, the CuCr2O4 particles are evenly distributed inside the matrix, which endows the membrane with great mechanical strength and excellent wear and abrasion resistance. The highly porous composite survives 6 atm pressure and retains its performance even after 75% of the membrane is removed by sandpaper. This work also looks into a generally overlooked aspect of wet versus dry state of photothermal material and its implications. Interestingly, the composite possesses a gray color with a high reflectance in dry state but turns into deep black with a low reflectance in wet state due to the decreased subsurface scattering and strong NIR light absorbance of water in wet state. This composite material also possesses excellent thermal stability and thermal shock resistance, making it able to be easily recovered by calcination in air or direct burning in fire for contaminants removal. The results demonstrate that this composite is a competitive photothermal material for practical solar distillation and indicate that the optical properties of material in wet state are more relevant to photothermal material screening and optimization for solar distillation.
Bipolar Magnetic Materials Based on 2D Ni[TCNE] Metal–Organic Coordination Networks
Authors: Chen Yu , Liu Junyi , Sun Qiang , Kawazoe Yoshiyuki , Jena Puru 
Published: December 2017

AbstractBipolar magnetic materials can produce alternative spin currents with 100% spin‐polarization by flexible electrical control, showing great potentials in spintronics. Using first‐principles calculations, it is demonstrated that the 2D metal–organic coordination networks, consisting of tetracyanoethylene (TCNE) molecules and Ni atoms, labeled Ni[TCNE], are bipolar magnetic materials showing rich properties: one isomer named a‐Ni[TCNE] is a bipolar magnetic semiconductor (BMS), and another isomer, p‐Ni[TCNE], behaves like a bipolar magnetic metal (BMM). The proper charge transfer leads to the localized spins at the Ni atoms and delocalized spin magnetic moments on the whole structure and the coupling between the localized spins and the itinerant spins is ferromagnetic. These traits of BMS and BMM in Ni[TCNE] networks add additional features to the family of 2D bipolar magnetic materials. This study paves the way for the design of organic based 2D bipolar magnetic spintronics materials.
Analysis of Ion‐Diffusion‐Induced Interface Degradation in Inverted Perovskite Solar Cells via Restoration of the Ag Electrode
Authors: Lee Hyunho , Lee Changhee 
Published: December 2017

AbstractStraightforward evidence for ion‐diffusion‐induced interfacial degradation in inverted perovskite solar cells is presented. Over 1000 h, solar cells inevitably undergo degradation, especially with respect to the current density and fill factor. The Ag electrode is peeled off and re‐evaporated to investigate the effect of the Ag/[6,6]‐phenyl C71 butyric acid methyl ester (PCBM) interfacial degradation on the photovoltaic performance at days 10 (240 h), 20 (480 h), 30 (720 h), and 40 (960 h). The power conversion efficiency increases after the Ag electrode restoration process. While the current density shows a slightly decreased value, the fill factor and open‐circuit voltage increase for the new electrode devices. The decrease in the activation energy due to the restored Ag electrode induces recovery of the fill factor. The diffused I− ions react with the PCBM molecules, resulting in a quasi n‐doping effect of PCBM. Upon electrode exchange, the reversible interaction between the iodine ions and PCBM causes current density variation. The disorder model for the open‐circuit voltage over a wide range of temperatures explains the open‐circuit voltage increase at every electrode exchange. Finally, the degradation mechanism of the inverted perovskite solar cell over 1000 h is described under the proposed recombination system.
1,6‐Conjugate Addition of 1,3‐Dicarbonyl Compounds to para‐Quinone Methides Enabled by Noncovalent N‐Heterocyclic Carbene Catalysis
Authors: Santra Surojit , Porey Arka , Guin Joyram 
Published: December 2017

AbstractCatalysis with N‐heterocyclic carbenes (NHCs) via substrate activation through noncovalent interactions offers a great opportunity to perform organic transformations. Herein, we demonstrate an efficient catalytic method for the 1,6‐conjugate addition of 1,3‐dicarbonyl compounds to para‐quinone methides (p‐QMs) using NHCs as Brønsted‐base catalysts. The method is applicable to a wide range of functionalized substrates with respect to both 1,3‐diketones and p‐QMs. An initial study using chiral NHCs provides information on the feasibility of developing a catalytic enantioselective variant of this reaction.
Reinforcement of polysiloxane/silica elastomer composite by introduction of sacrificial bonds
Authors: Zhao Dannan , Chen Guowen , Yao Huiling , Song Yuanchao 
Published: December 2017

ABSTRACTIt is a challenge to improve tear strength of silicone rubber, especially at high filler loading circumstances. A method is offered here to introduce sacrificial bonds into the system. In particular, amide group was introduced onto the phenyl group of monomer methyl phenyl cyclosiloxane (
first, and this functionalized monomer (
was further used for copolymerization with octamethylcyclotetrasiloxane (D4) and 2,4,6,8‐tetravinyl‐2,4,6,8‐tetramethyl‐cyclotetrasiloxane (
). Vulcanizates composed by this new copolymer (1A‐50) which amide group‐containing is 1 wt % and with 50 phr TS‐530 exhibit high tear strength of about 54 N • mm−1, which is three times higher than that composed by polydimethylsiloxane (PDMS)/TS‐530 (50 phr). The mechanical test indicates this new copolymer a promising candidate for the construction of high tear resistant silicone rubber, especially at high filler loading circumstances. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018, 135, 46129.
Long‐Term Effects of Neonatal Hyperoxia in Adult Mice
Authors: Kumar Vasantha H.S. , Wang Huamei , Kishkurno Sergei , Paturi Babu S , Nielsen Lori , Ryan Rita M. 
Published: December 2017

ABSTRACTThe outcomes of premature infants have improved greatly; however, the health risks in adulthood are still relatively unclear. Bronchopulmonary dysplasia (BPD) in premature infants is a major risk factor for alteration in lung function and predisposition to respiratory morbidity, and is associated with hyperoxia. The study explores the effect of neonatal hyperoxia on organ systems in adult mice. Newborn mouse litters were randomized to 85%O2 or room air (RA) on P3 for 12 days; mice were sacrificed at P3, P7, P15, 3 months and 9 months. Lungs were assessed by histopathology, radial alveolar count, mean linear intercept, and α‐Smooth muscle actin immunohistochemistry. Aortic assessment included histology, wall thickness, elastin, and collagen content. Glomerular histology and nephron number were assessed in the kidneys. Hyperoxia‐exposed mice had progressive alveolar simplification and poor weight gain over time. Greater thickness of pulmonary arterioles by 3 months and a higher Fulton index by 9 months suggest worsening pulmonary hypertension. Aortic wall thickness to lumen ratio was greater with a lower aortic elastin‐to‐collagen ratio suggesting long‐term effects of neonatal hyperoxia. Hyperoxia‐exposed mice at 9 months had smaller glomeruli as indicated by glomerular diameter and volume. Prolonged neonatal hyperoxia during the critical period of development induces irreversible lung damage, pulmonary hypertension and structural changes in the kidneys and aorta in adult mice. This could have implications for chronic adult diseases following exposure to high levels of oxygen in the newborn period. Anat Rec, 301:717–726, 2018. © 2017 Wiley Periodicals, Inc.
Subchondral Bone Radiodensity Patterns in the Glenoid Fossa of Ape and Human Scapulae
Authors: Patel Biren A. , Romanu Joshua T. , Carlson Kristian J. 
Published: December 2017

ABSTRACTRegions of denser subchondral bone deep to a joint's articular surface indicate locations where the joint experiences relatively higher or more frequent compressive trans‐articular forces than less dense regions. Human clinically focused studies have hypothesized that regional variation of acquired with computed tomography osteoabsorptiomety (CT‐OAM), in the scapular glenoid fossa (GF) is specifically related to forces arising from everyday rotator cuff muscle function. We test this hypothesis by investigating the relationship between rotator cuff function and GF HiRD subchondral bone patterns in a broader comparative context. CT‐OAM was used on scapulae of chimpanzees, gibbons and humans to visualize HiRD subchondral bone patterns and assess regional (anterior–posterior; superior–inferior) differences in HiRD concentrations within each group. Like patterns observed in humans, ape GFs show HiRD concentrations in anterior, posterior and superior regions. Gibbons exhibit significantly larger concentrations anteriorly, probably serving as a skeletal correlate of increased subscapularis activity during humeral internal rotation during arm‐swinging locomotion. Chimpanzees exhibit relatively larger areas posteriorly (though not statistically significant), conceivably serving as a correlate of increased infraspinatus activity during humeral external rotation and retraction during knuckle‐walking. All groups show relatively larger HiRD areas superiorly, likely correlating with forceful humeral abduction (rather than adduction) during routine upper limb use across behaviors. Subchondral bone HiRD patterns in the GF appear to correspond with normal and unbalanced rotator cuff activity and force production not only in humans, but also in other primates, thereby corroborating their value in human clinical studies and functional morphology research. Anat Rec, 301:776–785, 2018. © 2017 Wiley Periodicals, Inc.
Photooxidation of a Twisted Isoquinolinone
Authors: Li Gang , Zhao Jianfeng , Yang Shufan , Li Yongxin , Rakesh Ganguly , Zhang Qichun 
Published: December 2017

AbstractUnderstanding the oxidation mechanism and positions of twistacenes and twistheteroacenes under ambient conditions is very important because such knowledge can guide us to design and synthesize novel, larger stable analogues. Herein, we demonstrated for the first time that a twisted isoquinolinone can decompose under oxygen and light at room temperature. The as‐decomposed product 1 was fully characterized through conventional methods as well as single‐crystal structure analysis. Moreover, the physical properties of the as‐obtained product were carefully investigated and the possible formation mechanism was proposed.
Detection of radial velocity variability of HD 16673 with TIGRE
Authors: Mittag M. , Hempelmann A. , Fuhrmeister B. , Czesla S. , Schmitt J. H. M. M. 
Published: December 2017

AbstractDuring our TIGRE activity monitoring of late‐type stars, large radial velocity (RV) variations in the F‐type star HD 16673 were noticed. An automatic pipeline procedure using data in the wavelength range from 6000 to 7900 Å was developed and telluric lines are used as reference to determine accurate radial velocities. The RV curve demonstrates the binary nature of the HD 16673 system and allows the determination of the orbital parameters of the system. Based on the derived mass function, we obtain inclination‐dependent mass estimates for the secondary component, which orbits with a period of 37.09 days in a slightly eccentric orbit and is probably a late‐type star.
Methanol independent induction in Pichia pastoris by simple derepressed overexpression of single transcription factors
Authors: Vogl Thomas , Sturmberger Lukas , Fauland Pia C. , Hyden Patrick , Fischer Jasmin E. , Schmid Christian , Thallinger Gerhard G. , Geier Martina , Glieder Anton 
Published: December 2017

AbstractCarbon source regulated promoters are well‐studied standard tools for controlling gene expression. Acquiring control over the natural regulation of promoters is important for metabolic engineering and synthetic biology applications. In the commonly used protein production host Komagataella phaffii (Pichia pastoris), methanol‐inducible promoters are used because of their tight regulation and exceptional strength. Yet, induction with toxic and flammable methanol can be a considerable safety risk and cannot be applied in many existing fermentation plants. Here we studied new regulatory circuits based on the most frequently used alcohol oxidase 1 promoter (PAOX1), which is tightly repressed in presence of repressing carbon sources and strongly induced by methanol. We compared different overexpression strategies for putative carbon source dependent regulators identified by a homology search in related yeasts and previously published literature in order to convert existing methanol dependent expression strains into methanol free systems. While constitutive overexpression showed only marginal or detrimental effects, derepressed expression (activated when the repressing carbon source is depleted) showed that three transcription factors (TFs) are single handedly suitable to strongly activate PAOX1 in P. pastoris without relying on any specifically engineered host strains. Transcriptome analyses demonstrated that Mxr1, Mit1, and Prm1 regulate partly overlapping and unique sets of genes. Derepressed overexpression of a single TF was sufficient to retrofit existing PAOX1 based expression strains into glucose/glycerol regulated, methanol‐free systems. Given the wide applicability of carbon source regulated promoters, the simplicity and low cost of controlling carbon source feed rates in large scale bioreactors, similar approaches as in P. pastoris may also be useful in other organisms.
Identification of process conditions influencing protein aggregation in Chinese hamster ovary cell culture
Authors: Paul Albert J. , Handrick René , Ebert Sybille , Hesse Friedemann 
Published: December 2017

AbstractProtein aggregation of monoclonal antibodies (mAbs) is a common phenomenon associated with the production of these biopharmaceuticals. These aggregates can lead to adverse side effects in patients upon administration, thus expensive downstream processing steps to remove the higher molecular weight species are inevitable. A preferable approach is to reduce the level of aggregation during bioprocessing by a careful adjustment of critical process parameters. Recently, new analytical methods enabled characterization of mAb aggregation during bioprocessing of mammalian cells. Furthermore, rapid and efficient bioprocess optimization has been performed using design of experiments (DoE) strategies. In this work, we describe a DoE‐based approach for the analysis of process parameters and cell culture additives influencing protein aggregation in Chinese hamster ovary (CHO) cell cultures. Important bioprocess variables influencing the aggregation of mAb and host cell proteins were identified in initial screening experiments. Response surface modeling was further applied in order to find optimal conditions for the reduction of protein aggregation during cell culture. It turned out that a temperature‐shift to 31 °C, osmolality above 420 mOsm/kg, agitation at 100 rpm and 0.04% (w/v) antifoam significantly reduced the level of aggregates without substantial detrimental effects on cell culture performance in our model system. Finally, the aggregation reducing conditions were verified and applied to another production system using a different bioprocess medium and another CHO cell line producing another mAb. Our results show that protein aggregation can be controlled during cell culture and helps to improve bioprocessing of mAbs, by giving insights into the protein aggregation at its origin in mammalian cell culture.