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https://www.readbyqxmd.com/read/28731343/-roller-wheel-pt-containing-small-molecules-and-the-impact-of-rollers-on-material-crystallinity-electronic-properties-and-solar-cell-performance
#1
Wenhan He, Maksim Y Livshits, Diane A Dickie, Zhen Zhang, Luis E Mejiaortega, Jeffrey J Rack, Qin Wu, Yang Qin
We report the synthesis, characterization and detailed comparison of a series of novel Pt-bisacetylide containing conjugated small molecules possessing an unconventional "roller-wheel" shaped structure that is distinctly different from the "dumbbell" designs in traditional Pt-bisacetylide containing conjugated polymers and small molecules. The relationship between the chemical nature and length of the "rollers" and the electronic and physical properties of the materials are carefully studied by steady state spectroscopy, cyclic voltammetry, differential scanning calorimetry, single-crystal X-ray diffraction, transient absorption spectroscopy, theoretical calculation and device application...
July 21, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28731338/tunable-magnetism-and-extraordinary-sunlight-absorbance-in-indium-triphosphide-monolayer
#2
Naihua Miao, Bin Xu, Nicholas C Bristowe, Jian Zhou, Zhimei Sun
Atomically thin two-dimensional (2D) materials have received considerable research interest due to their extraordinary properties and promising applications. Here we predict the mono-layered indium triphosphide (InP3) as a new semiconducting 2D material with a range of favourable functional properties by means of ab initio calculations. The 2D InP3 crystal shows high stability and promise of experimental synthesis. It possesses an indirect band-gap of 1.14 eV and a high electron mobility of 1919 cm(2)V(-1)s(-1), which can be strongly manipulated with applied strain...
July 21, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28731325/bioinspired-and-biomimetic-agnps-gentamicin-embedded-silk-fibroin-coatings-for-robust-antibacterial-and-osteogenetic-applications
#3
Wenhao Zhou, Zhaojun Jia, Pan Xiong, Jianglong Yan, Yangyang Li, Ming Li, Yan Cheng, Yufeng Zheng
With the progressively increasing demand for orthopedic Ti implants, the balance realization between two primary complications restricting implants applications is imperative needed to be solved that the lack of bone tissue integration and biomedical device-associated infections (BAI), where emergence of multi-resistance bacteria make it worse. Notably, a combination of silver nanoparticles (AgNPs) and a kind of antibiotic can synergistically inhibit bacterial growth, where low concentration of AgNPs has been confirmed to promote the proliferation and osteogenesis of osteoblasts...
July 21, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28731082/from-the-metal-to-the-channel-a-study-of-carrier-injection-through-the-metal-2d-mos2-interface
#4
Goutham Arutchelvan, César J Lockhart de la Rosa, Philippe Matagne, Surajit Sutar, Iuliana Radu, Cedric Huyghebaert, Stefan De Gendt, Marc Heyns
Despite the fact that two-dimensional MoS2 films continue to be of interest for novel device concepts and beyond silicon technologies, there is still a lack of understanding on the carrier injection at metal/MoS2 interface and effective mitigation of the contact resistance. In this work, we develop a semi-classical model to identify the main mechanisms and trajectories for carrier injection at MoS2 contacts. The proposed model successfully captures the experimentally observed contact behavior and the overall electrical behavior of MoS2 field effect transistors...
July 21, 2017: Nanoscale
https://www.readbyqxmd.com/read/28730726/changes-in-the-extracellular-matrix-surrounding-human-chronic-wounds-revealed-by-2-photon-imaging
#5
Jessica E S Sutcliffe, Christopher Thrasivoulou, Thomas E Serena, Leigh Madden, Toby Richards, Anthony R J Phillips, David L Becker
Chronic wounds are a growing problem worldwide with no effective therapeutic treatments available. Our objective was to understand the composition of the dermal tissue surrounding venous leg ulcers and diabetic foot ulcers (DFU). We used novel 2-photon imaging techniques alongside classical histology to examine biopsies from the edges of two common types of chronic wound, venous leg ulcers and DFU. Compared to normal intact skin, we found that collagen levels are significantly reduced throughout the dermis of venous leg ulcer biopsies and DFU, with a reduction in both fibril thickness and abundance...
July 20, 2017: International Wound Journal
https://www.readbyqxmd.com/read/28729682/memristive-property-s-effects-on-the-i-v-characteristics-of-perovskite-solar-cells
#6
Kai Yan, Bin Dong, Xinyu Xiao, Si Chen, Buxin Chen, Xue Gao, Hsienwei Hu, Wen Wen, Jingbo Zhou, Dechun Zou
The unfavorable I-V characteristics of perovskite solar cells (PSCs), such as the I-V hysteresis phenomena, have been one major obstacle for their future practical application. However, corresponding analysis based on traditional theories have shown non-negligible flaws and failed for satisfactory explanation. To present a novel mechanism, here we utilize for the first time the memristive property of the perovskite material to analyze the I-V characteristics of PSCs. The obtained joint physical model and the deduced equation may help solving the long-existent mysteries of the I-V characteristics of PSCs...
July 20, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28728924/strabismus-measurements-with-novel-video-goggles
#7
Konrad P Weber, Daniel Rappoport, Muriel Dysli, Tanja Schmückle Meier, Guy B Marks, Christopher J Bockisch, Klara Landau, Hamish G MacDougall
PURPOSE: To assess the validity of a novel, simplified, noninvasive test for strabismus using video goggles. DESIGN: Cross-sectional method comparison study in which the new test, the strabismus video goggles, is compared with the existing reference standard, the Hess screen test. PARTICIPANTS: We studied 41 adult and child patients aged ≥6 years with ocular misalignment owing to congenital or acquired paralytic or comitant strabismus and 17 healthy volunteers...
July 17, 2017: Ophthalmology
https://www.readbyqxmd.com/read/28727615/multiplexing-prisms-for-field-expansion
#8
Eli Peli, Jae-Hyun Jung
PURPOSE: Prisms used for field expansion are limited by the optical scotoma at a prism apex (apical scotoma). For a patient with two functioning eyes, fitting prisms unilaterally allows the other eye to compensate for the apical scotoma. A monocular patient's field loss cannot be expanded with a conventional or Fresnel prism because of the apical scotoma. A newly invented optical device, the multiplexing prism (MxP), was developed to overcome the apical scotoma limitation in monocular field expansion...
July 19, 2017: Optometry and Vision Science: Official Publication of the American Academy of Optometry
https://www.readbyqxmd.com/read/28727450/carbon-nanotube-reinforced-polymer-stabilized-liquid-crystal-device-lowered-and-thermally-invariant-threshold-with-accelerated-dynamics
#9
Subbarao Krishna Prasad, Marlin Baral, Adhigan Murali, Sellamuthu N Jaisankar
Polymer stabilized liquid crystal (PSLC) devices comprise a polymer matrix in an otherwise continuous phase of liquid crystal. The fibrils of the polymer provide, even in the bulk, virtual surfaces with finite anchoring energy resulting in attractive electro-optic properties. Here we describe a novel variation of the PSLC device fabricated by reinforcing the polymer matrix with polymer-capped single-walled carbon nanotubes (CNTs). The most important outcome of this strengthening of the polymer strands is that the threshold voltage associated with the electro-optic switching becomes essentially temperature independent in marked contrast to the significant thermal variation seen in the absence of the nanotubes...
July 20, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28727411/one-step-synthesis-of-anti-oxidative-graphene-wrapped-copper-nanoparticles-on-flexible-substrates-for-electronic-and-electro-catalytic-applications
#10
Chi-Ang Tseng, Chiao-Chen Chen, Rajesh Kumar Ulaganathan, Chuan-Pei Lee, Hsu-Cheng Chiang, Chin-Fu Chang, Yit-Tsong Chen
In this study, we report a novel, one-step synthesis method to fabricate multi-layer graphene (MLG)-wrapped copper nanoparticles (CuNPs) directly on various substrates (e.g., polyimide film (PI), carbon cloth (CC)) or Si wafer (Si)). The electrical resistivities of the pristine MLG-CuNPs/PI and MLG-CuNPs/Si were measured 1.7 × 10(-6) and 1.4 × 10(-6) Ω·m, respectively, of which both values are ~100-fold lower than earlier reports. The MLG shell could remarkably prevent the Cu nanocore from serious damages after MLG-CuNPs being exposed to various harsh conditions...
July 20, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28726970/a-homeotropic-main-chain-tolane-type-liquid-crystal-elastomer-film-exhibiting-high-anisotropic-thermal-conductivity
#11
Si-Jia Ge, Ti-Peng Zhao, Meng Wang, Lin-Lin Deng, Bao-Ping Lin, Xue-Qin Zhang, Ying Sun, Hong Yang, Er-Qiang Chen
The development of pure polymeric films with anisotropic thermal conductivities for electronic device packaging applications has attracted intense scientific attention. In order to enhance the polymeric film's normal-direction thermal conductivity, homeotropic alignment of macromolecular chains is the primary concern. One of the promising preparation strategies is to perform in situ photopolymerization of homeotropic-oriented liquid crystal monomers. In this work, we design and synthesize a novel tolane-core thiol-ene-tailed liquid crystal monomer...
July 20, 2017: Soft Matter
https://www.readbyqxmd.com/read/28726942/conjugated-polymer-covalently-modified-graphene-oxide-quantum-dots-for-ternary-electronic-memory-devices
#12
Fei Fan, Bin Zhang, Yaming Cao, Xutong Yang, Junwei Gu, Yu Chen
Zero dimensional graphene oxide (GO) quantum dots (GOQDs) have been expected to play an important role in the development of new memory materials. When the size of GO was reduced to that of GOQDs, both the electron affinity and ionization potential of GO were found to be decreased, and this was followed by the elevation of lowest energy unoccupied molecular orbital (LUMO) energy level. This implies that the electron withdrawing ability of GOQDs is weaker than that of GO. In this work, a novel arylamine-based polyazomethine covalently functionalized graphene oxide quantum dots (TPAPAM-GOQDs), which was synthesized using an amidation reaction, was for the first time used to fabricate a ternary memory device with a configuration of gold/TPAPAM-GOQDs/indium tin oxide...
July 20, 2017: Nanoscale
https://www.readbyqxmd.com/read/28726927/custom-3d-printer-and-resin-for-18-%C3%AE-m-%C3%A3-20-%C3%AE-m-microfluidic-flow-channels
#13
Hua Gong, Bryce P Bickham, Adam T Woolley, Gregory P Nordin
While there is great interest in 3D printing for microfluidic device fabrication, to-date the achieved feature sizes have not been in the truly microfluidic regime (<100 μm). In this paper we demonstrate that a custom digital light processor stereolithographic (DLP-SLA) 3D printer and a specifically-designed, low cost, custom resin can readily achieve flow channel cross sections as small as 18 μm × 20 μm. Our 3D printer has a projected image plane resolution of 7.6 μm and uses a 385 nm LED, which dramatically increases the available selection of UV absorbers for resin formulation compared to 3D printers with 405 nm LEDs...
July 20, 2017: Lab on a Chip
https://www.readbyqxmd.com/read/28726903/reversible-trans-%C3%A2-cis-photoisomerizations-of-re-co-3-ph2phen-stpycn-towards-molecular-machines
#14
Kassio P S Zanoni, Neyde Y Murakami Iha
In our search for light powered molecular devices, a novel fac-[Re(CO)3(ph2phen)(trans-stpyCN)](+) complex was synthesized to show switchable trans-cis configurations of the coordinated stpyCN ligand through efficient and reversible photoassisted isomerizations. Controlled photolyses of acetonitrile solutions led to spectral changes ascribed to reversible trans ⇌ cis photoisomerization processes. A remarkable quantum yield for the back cis-to-trans isomerization was obtained, with the same magnitude of the trans-to-cis photoprocess, and curiously, both trans- and cis-isomers are emissive at room temperature...
July 20, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/28726499/an-in-vitro-study-of-a-new-device-evaluation-of-novel-wide-angle-lens-flexible-cystoscope-using-phantom-bladder-model
#15
Kunihisa Yamaguchi, Takamitsu Inoue, Tomonori Habuchi, Junichi Inokuchi, Akira Yokomizo, Masatoshi Eto, Hiro-Omi Kanayama
INTRODUCTION: The features and usefulness of a novel wide-angle lens flexible cystoscope were assessed with a view to its practical application. MATERIALS AND METHODS: A phantom bladder model on which a total of 12 markers that resemble lesions were arranged was created for this study. Twenty-six urologists at three institutions observed this phantom bladder model using a conventional flexible cystoscope and a novel wide-angle lens flexible cystoscope, and they compared the observation time, marker detection rate, number of misidentified marker locations, overlooked locations, and misidentified location sites of both devices...
July 20, 2017: Journal of Endourology
https://www.readbyqxmd.com/read/28726331/novel-fluid-shear-based-dissociation-device-for-improved-single-cell-dissociation-of-spheroids-and-cell-aggregates
#16
Ursula L Triantafillu, Jaron N Nix, Yonghyun Kim
Biological industries commonly rely on bioreactor systems for the large-scale production of cells. Cell aggregation, clumping, and spheroid morphology of certain suspension cells make their large-scale culture challenging. Growing stem cells as spheroids is indispensable to retain their stemness, but large spheroids (>500 µm diameter) suffer from poor oxygen and nutrient diffusion, ultimately resulting in premature cell death in the centers of the spheroids. Despite this, most large-scale bioprocesses do not have an efficient method for dissociating cells into single cells, but rely on costly enzymatic dissociation techniques...
July 20, 2017: Biotechnology Progress
https://www.readbyqxmd.com/read/28726148/first-human-use-of-hybrid-synthetic-biologic-mesh-in-ventral-hernia-repair-a-multicenter-trial
#17
James G Bittner, Kevin El-Hayek, Andrew T Strong, Melissa Phillips LaPinska, Jin S Yoo, Eric M Pauli, Matthew Kroh
BACKGROUND: Mesh options for reinforcement of ventral/incisional hernia (VIH) repair include synthetic or biologic materials. While each material has known advantages and disadvantages, little is understood about outcomes when these materials are used in combination. This multicenter study reports on the first human use of a novel synthetic/biologic hybrid mesh (Zenapro(®) Hybrid Hernia Repair Device) for VIH repair. METHODS: This prospective, multicenter post-market clinical trial enrolled consecutive adults who underwent elective VIH repair with hybrid mesh placed in the intraperitoneal or retromuscular/preperitoneal position...
July 19, 2017: Surgical Endoscopy
https://www.readbyqxmd.com/read/28725113/cystic-duct-pressures-after-ligation-with-a-novel-absorbable-device-in-an-ex-vivo-caprine-cholecystectomy-model
#18
Andrea J Sundholm Tepper, Odd V Höglund, Bonnie G Campbell, Chi-Ya Chen, Boel A Fransson
Laparoscopic cholecystectomy is the standard of care in human medicine for gall bladder disease. Although infrequently reported in veterinary literature, laparoscopic cholecystectomy is an option for uncomplicated gall bladder disease in canine patients. Due to the risk of cystic duct ligature slippage or clip dislodgement, we wanted to explore the use of a LigaTie; a novel absorbable medical device modeled after a cable tie. Our object was to describe the use of the LigaTie in a caprine cadaveric study of cholecystectomies as a model for canine patients and demonstrate the leak pressure of the cystic duct compared with cholecystectomies performed with 2 large endoscopic hemoclips...
July 2017: Canadian Journal of Veterinary Research, Revue Canadienne de Recherche Vétérinaire
https://www.readbyqxmd.com/read/28724998/effect-of-defects-controlled-by-preparation-condition-and-heat-treatment-on-the-ferromagnetic-properties-of-few-layer-graphene
#19
Qinghua Miao, Lidong Wang, Zhaoyuan Liu, Bing Wei, Jinhui Wang, Xiangli Liu, Weidong Fei
Magnetism in graphene has stimulated extensive studies to search for novel metal-free magnetic device. In this paper, we use a synthesis method far from equilibrium state named self-propagating high temperature synthesis (SHS) to produce few-layer graphene with different defect contents and then use a heat treatment process (vacuum-annealing and air-cooling) to further control the defects in graphene. We find that the type and content of defects in graphene can be controlled by adjusting the mole ratio of reactants (Mg: CaCO3) for SHS reaction and the temperature of the subsequent heat treatment...
July 19, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28723182/cross-linked-gold-nanoparticle-membrane-resonators-as-microelectromechanical-vapor-sensors
#20
Hendrik Schlicke, Malte Behrens, Clemens J Schröter, Gregor T Dahl, Hauke Hartmann, Tobias Vossmeyer
We report a novel approach for the detection of volatile compounds employing electrostatically driven drumhead resonators as sensing elements. The resonators are based on freestanding membranes of alkanedithiol cross-linked gold nanoparticles (GNPs), which are able to sorb analytes from the gas phase. Under reduced pressure, the fundamental resonance frequency of a resonator is continuously monitored while the device is exposed to varying partial pressures of toluene, 4-methylpentan-2-one, 1-propanol, and water...
April 28, 2017: ACS Sensors
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