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Mobility bands

Dana Schwarz, Yaroslav S Kochergin, Amitava Acharja, Arun Ichangi, Maksym V Opanasenko, Jiří Čejka, Uwe Lappan, Pal Arki, Junjie He, Johannes Schmidt, Petr Nachtigall, Arne Thomas, Michael Janus Bojdys
Donor-acceptor dyads hold the key to tuning of electrochemical properties and enhanced mobility of charge carriers, yet their incorporation into a heterogeneous polymer network proves difficulty due to the fundamentally different chemistry of the donor- and acceptor-subunits. We present a family of sulphur and nitrogen containing porous polymers (SNPs) that are obtained via Sonogashira-Hagihara cross-coupling and that combine electron-withdrawing triazine (C3N3) and electron donating, sulphur-containing linkers...
July 20, 2017: Chemistry: a European Journal
Hideo Takahashi, Andrew T Strong, Alfredo D Guerron, John H Rodriguez, Matthew Kroh
INTRODUCTION: Anastomotic leaks are uncommon yet potentially devastating complications after bariatric surgery. While the initial management includes resuscitation and sepsis control, the definitive management often requires endoscopic or surgical interventions. Surgical revision of the initial surgery may be necessary for chronic non-healing fistula. PATIENTS AND METHODS: The patient is a 45-year-old female with history of laparoscopic adjustable gastric banding who underwent band removal and conversion to a sleeve gastrectomy (SG) due to her failed weight loss, which resulted in a leak at gastroesophageal junction...
July 19, 2017: Surgical Endoscopy
Nasir A Siddiqui, Ramzi A Mothana, Adnan J Al-Rehaily, Perwez Alam, Muhammad Yousaf, Sarfaraz Ahmed, Abdulrahman Alatar
The biomarkers are needed to be defined for standardization purposes so that safe and effective herbal formulations can be catered to the society. There is an urgent need for statistical support of herbal drugs because most of the herbal products are still used in the non-standardized form. This study is based on the development of a simple and sensitive RP-HPTLC method for concurrent estimation of two biomarkers ent-phyllanthidine and rutin in the methanol extract of aerial parts of Flueggea virosa. The developed method was found to be simple, economic and sensitive...
July 2017: Saudi Pharmaceutical Journal: SPJ: the Official Publication of the Saudi Pharmaceutical Society
Stephen R Groskreutz, Anthony R Horner, Stephen G Weber
On-column solute focusing is a simple and powerful method to decrease the influence of precolumn band spreading and increase the allowable volume injected increasing sensitivity. It relies on creating conditions so that the retention factor, k', is transiently increased during the injection process. Both solvent composition and temperature control can be used to effect solute focusing. In the case of temperature, the release of the transiently delayed solute band requires increasing the temperature rapidly and with a minimum of radial thermal gradients...
July 8, 2017: Journal of Chromatography. A
Jozef Šesták, Wolfgang Thormann
Part I on head-column field-amplified sample stacking comprised a detailed study of the electrokinetic injection of a weak base across a short water plug into a phosphate buffer at low pH. The water plug is converted into a low conductive acidic zone and cationic analytes become stacked at the interface between this and a newly formed phosphoric acid zone. The fundamentals of electrokinetic processes occurring thereafter were studied experimentally and with computer simulation and are presented as part II. The configuration analyzed represents a discontinuous buffer system...
June 30, 2017: Journal of Chromatography. A
Xiangyu Cao, Alberto Rosso, Jean-Philippe Bouchaud, Pierre Le Doussal
We introduce and study a banded random matrix model describing sparse, long-range quantum hopping in one dimension. Using a series of analytic arguments, numerical simulations, and a mapping to a long-range epidemics model, we establish the phase diagram of the model. A genuine localization transition, with well defined mobility edges, appears as the hopping rate decreases slower than ℓ^{-2}, where ℓ is the distance. Correspondingly, the decay of the localized states evolves from a standard exponential shape to a stretched exponential and finally to a exp(-Cln^{κ}ℓ) behavior, with κ>1...
June 2017: Physical Review. E
Andrew J Clough, Jonathan M Skelton, Courtney A Downes, Ashley De la Rosa, Joseph W Yoo, Aron Walsh, Brent C Melot, Smaranda C Marinescu
Two-dimensional (2D) metal-organic frameworks (MOFs) have received a great deal of attention due to their relatively high charge carrier mobility and low resistivity. Here we report on the temperature-dependent charge transport properties of a 2D cobalt 2,3,6,7,10,11-triphenylenehexathiolate framework. Variable temperature resistivity studies reveal a transition from a semiconducting to a metallic phase with decreasing temperature, which is unprecedented in MOFs. We find this transition to be highly dependent on the film thickness and the amount of solvent trapped in the pores, with density functional theory (DFT) calculations of the electronic-structure supporting the complex metallic conductivity of the material...
July 13, 2017: Journal of the American Chemical Society
Abiola A Ayanlaja, Ye Xiong, Yue Gao, GuangQuan Ji, Chuanxi Tang, Zamzam Abdikani Abdullah, DianShuai Gao
Neuronal migration is a critical process in the development of the nervous system. Defects in the migration of the neurons are associated with diseases like lissencephaly, subcortical band heterotopia (SBH), and pachygyria. Doublecortin (DCX) is an essential factor in neurogenesis and mutations in this protein impairs neuronal migration leading to several pathological conditions. Although, DCX is capable of modulating and stabilizing microtubules (MTs) to ensure effective migration, the mechanisms involved in executing these functions remain poorly understood...
2017: Frontiers in Molecular Neuroscience
Kirby K H Smithe, Saurabh V Suryavanshi, Miguel Munoz-Rojo, Aria D Tedjarati, Eric Pop
Despite much interest in applications of two-dimensional (2D) fabrics such as MoS2, to date most studies have focused on individual or few devices. Here we examine the variability of hundreds of transistors fabricated from large-area monolayer MoS2 synthesized by chemical vapor deposition (CVD). Ultraclean fabrication yields very low surface roughness of ~3 Å and surprisingly low variability of key device parameters, considering the atomically thin nature of the material. Across continuous films >1 cm(2) the field-effect mobility averages 34...
July 11, 2017: ACS Nano
Matthew Siljander, Alexander D Vara, Denise M Koueiter, Sapan Gandhi, Meghan Quigley, Brett Wiater, Patrick Wiater
Operative management of patella fractures continues to be associated with poor outcomes and high reoperation rates. Traditionally, tension band fixation has been used for more simple fracture patterns; however, fixation remains a challenge particularly for comminuted fractures. More recently, various types of plate fixation have been used and reported in the literature. Earlier mobilization after plate osteosynthesis of patella fractures is possible because of a more robust construct, with the potential for decreased knee stiffness and improved functional outcomes...
August 2017: Journal of Orthopaedic Trauma
Lucas M Carneiro, Scott K Cushing, Chong Liu, Yude Su, Peidong Yang, A Paul Alivisatos, Stephen R Leone
Small polaron formation is known to limit ground-state mobilities in metal oxide photocatalysts. However, the role of small polaron formation in the photoexcited state and how this affects the photoconversion efficiency has yet to be determined. Here, transient femtosecond extreme-ultraviolet measurements suggest that small polaron localization is responsible for the ultrafast trapping of photoexcited carriers in haematite (α-Fe2O3). Small polaron formation is evidenced by a sub-100 fs splitting of the Fe 3p core orbitals in the Fe M2,3 edge...
July 10, 2017: Nature Materials
Ao Liu, Huihui Zhu, Zidong Guo, You Meng, Guoxia Liu, Elvira Fortunato, Rodrigo Martins, Fukai Shan
Low-temperature solution processing opens a new window for the fabrication of oxide semiconductors due to its simple, low cost, and large-area uniformity. Herein, by using solution combustion synthesis (SCS), p-type Cu-doped NiO (Cu:NiO) thin films are fabricated at a temperature lower than 150 °C. The light doping of Cu substitutes the Ni site and disperses the valence band of the NiO matrix, leading to an enhanced p-type conductivity. Their integration into thin-film transistors (TFTs) demonstrates typical p-type semiconducting behavior...
July 10, 2017: Advanced Materials
Gözde Murat Saltan, Deniz Aykut Kıymaz, Ceylan Zafer, Haluk Dinçalp
The riboflavin dye 2,3,4,5-tetra-O-acetyl-1-[3-(6-bromohexyl)-7,8-dimethyl-2,4-dioxo-3,4-dihydrobenzo[g]pteridin-10(2H)-yl]-1-deoxypentitol and its pyridinium salt were synthesized, and studied by absorption and fluorescence spectroscopy in solutions and on thin film states. The first absorption band of riboflavin-pyridinium salt derivative is red-shifted by 10 nm compared to neutral one on film. Cationic riboflavin derivative shows significant wavelength changes on its fluorescence emission spectrum in the excited state depending on the solvent polarity and the electronic environment...
July 7, 2017: Journal of Fluorescence
S Haldar, V K Dixit, Geetanjali Vashisht, Shailesh Kumar Khamari, S Porwal, T K Sharma, S M Oak
Effect of charge carrier confinement and ultra-low disorder acquainted in AlGaAs/GaAs multi-quantum well system is investigated via Magneto-photoluminescence spectroscopy. Significant increase of effective mass is observed for the confined exciton in narrow QWs. The foremost reason behind such an observation is due to the induced non-parabolicity in bands. Moreover, as the thickness of the QW are reduced, confined excitons in QW experience atomic irregularities at the hetero-junctions and their effects are prominent in the photoluminescence linewidth...
July 7, 2017: Scientific Reports
Tyler James Smart, Yuan Ping
Hematite (α-Fe2O3) is a promising candidate as photoanode materials for solar-to-fuel conversion due to its favorable band gap for visible light absorption, its stability in an aqueous environment and its relatively low cost in comparison to other prospective materials. However, the small polaron transport nature in α-Fe2O3 results in low carrier mobility and conductivity, significantly lowering its efficiency from the theoretical limit. Experimentally, it has been found that the incorporation of oxygen vacancies and other dopants, such as Sn, into the material appreciably enhances its photo-to- current efficiency...
July 7, 2017: Journal of Physics. Condensed Matter: An Institute of Physics Journal
Panlong Zhang, Haibo Wang, Donghang Yan
A key breakthrough in inorganic modern electronics is the energy-band engineering that plays important role to improve device performance or develop novel functional devices. A typical application is high electron mobility transistors (HEMTs), which utilizes 2D electron gas (2DEG) as transport channel and exhibits very high electron mobility over traditional field-effect transistors (FETs). Recently, organic electronics have made very rapid progress and the band transport model is demonstrated to be more suitable for explaining carrier behavior in high-mobility crystalline organic materials...
July 6, 2017: Advanced Materials
Hal Emmer, Christopher T Chen, Rebecca Saive, Dennis Friedrich, Yu Horie, Amir Arbabi, Andrei Faraon, Harry A Atwater
Due to its high refractive index and low absorption coefficient, gallium phosphide is an ideal material for photonic structures targeted at the visible wavelengths. However, these properties are only realized with high quality epitaxial growth, which limits substrate choice and thus possible photonic applications. In this work, we report the fabrication of single crystal gallium phosphide thin films on transparent glass substrates via transfer bonding. GaP thin films on Si (001) and (112) grown by MOCVD are bonded to glass, and then the growth substrate is removed with a XeF2 vapor etch...
July 5, 2017: Scientific Reports
Guoke Zhao, Xinming Li, Meirong Huang, Zhen Zhen, Yujia Zhong, Qiao Chen, Xuanliang Zhao, Yijia He, Ruirui Hu, Tingting Yang, Rujing Zhang, Changli Li, Jing Kong, Jian-Bin Xu, Rodney S Ruoff, Hongwei Zhu
Graphene has demonstrated great potential in next-generation electronics due to its unique two-dimensional structure and properties including a zero-gap band structure, high electron mobility, and high electrical and thermal conductivity. The integration of atom-thick graphene into a device always involves its interaction with a supporting substrate by van der Waals forces and other intermolecular forces or even covalent bonding, and this is critical to its real applications. Graphene films on different surfaces are expected to exhibit significant differences in their properties, which lead to changes in their morphology, electronic structure, surface chemistry/physics, and surface/interface states...
July 5, 2017: Chemical Society Reviews
Hong-Na Li, Fei Yuan, Yun-Jing Luo, Jian-Feng Wang, Chuan-Bin Zhang, Wei-E Zhou, Zhi-Qin Ren, Wen-Jie Wu, Feng Zhang
Staphylococcal enterotoxin A (SEA) was the major virulence factor of Staphylococcus aureus and a biomarker of S. aureus. To establish a fast, low cost, high accuracy, reliable, and simple method for detecting S. aureus, SEA was analyzed by HPLC-ESI-TOF. SEA was not yet commercially available in universal, so SEA was prepared before it was analyzed by HPLC-ESI-TOF. The result showed that high purified SEA was successfully prepared and SEA has normal distribution in mass spectra. A large amount of recombinant SEA (rSEA) was obtained by engineering technology and was purified by Ni affinity chromatography column, and the expression and purity of rSEA and SEA were analyzed by SDS-PAGE...
July 4, 2017: Environmental Science and Pollution Research International
Yanli Wang, Yi Ding
Very recently, a (SiH)2O-formed siloxene sheet has been synthesized in an experiment [S. Li, et al. J. Mater. Chem. A 2016, 4, 15841]. Utilizing first-principles calculations, we have systematically investigated the structural stability and the physical properties of this (SiH)2O sheet. We have found a dynamically stable structure because it is a puckered one with bent Si-O-Si connections, which leads to an anisotropic elastic behaviour with negative Poisson ratios. The (SiH)2O sheet has a strain-tunable direct band gap whose valence and conduction band edges straddle the redox potentials of water even in the presence of stress (either tensile or compressive)...
July 21, 2017: Physical Chemistry Chemical Physics: PCCP
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