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Albert C Aragones, Daniel Aravena, Francisco J Valverde-Muñoz, Jose Antonio Real, Fausto Sanz, Ismael Díez-Pérez, Eliseo Ruiz
The appropriate choice of the transition metal complex and metal surface electronic structure opens the possibility to control the spin of the charge carriers through the resulting hybrid molecule/metal spinterface in a single-molecule electrical contact at room temperature. The single-molecule conductance of a Au/molecule/Ni junction can be switched by flipping the magnetization direction of the ferromagnetic electrode. The requirements of the molecule are not just the presence of unpaired electrons, the electronic configuration of the metal centre have to provide occupied or empty orbitals that strongly interact with the junction metal electrodes and that are close in energy to their Fermi levels for one of the electronic spins only...
February 18, 2017: Journal of the American Chemical Society
Md Sazedul Islam, Papia Haque, Taslim U Rashid, M Nuruzzaman Khan, Abul K Mallik, M Nazrul I Khan, Mala Khan, Mohammed Mizanur Rahman
A multifunctional drug carrier with dual targeting (magnetic and folate-receptor) and pH sensitive core-shell hybrid nanomaterial has been developed to carry an anticancer drug doxorubicin.Superparamagnetic iron oxide nanoparticles (IONPs) were used as core of the carrier and cross-linked folate conjugated chitosan (FA-CS) was acted as shell in which doxorubicin was physically entrapped. Transmission electron microscopy (TEM) analysis confirmed the average particle size of IONPs and FA-CS coated IONPs 8.2 and 15...
April 2017: Journal of Materials Science. Materials in Medicine
Matteo Ceci, Davide Rattalino, Matteo Viola, Riccardo Beltrami, Marco Chiesa, Marco Colombo, Claudio Poggio
BACKGROUND: The objective of this in vitro study was to evaluate the over time color stability of one resin infiltrant (Icon) upon exposure to staining solutions (coffee and wine) compared with one nano-hybrid sealant (Grandio Seal), one transparent fissure sealant with fluoride (Control Seal) and one nanofilled composite (Filtek Supreme XTE). MATERIAL AND METHODS: All materials were polymerized according to manufacturers' instructions into silicon rings (height 1 mm; internal diameter 6 mm; external diameter 8 mm) to obtain specimens identical in size...
February 2017: Journal of Clinical and Experimental Dentistry
Sawanta S Mali, Chang Kook Hong, A I Inamdar, Hyunsik Im, Sang Eun Shim
The development of hybrid organo-lead trihalide perovskite solar cells (PSCs) comprising an electron transporting layer (ETL), a perovskite light absorber and a hole transporting layer (HTL) has received significant attention for their potential in efficient PSCs. However, the preparation of a compact and uniform ETL and the formation of a uniform light absorber layer suffer from a high temperature processing treatment and the formation of unwanted perovskite islands, respectively. A low temperature/room temperature processed ETL is one of the best options for the fabrication of flexible PSCs...
February 14, 2017: Nanoscale
Robert Musiał, Magdalena Lipińska-Strasik, Agnieszka Piątkiewicz, Jarosław Stoliński, Rafał Drwiła
BACKGROUND: The authors present their own experience of the treatment of patients qualified for transcatheter aortic valve implantation (TAVI) carried out in a modern hybrid operating room. The objective of the present study was to demonstrate the initial results of conducting anaesthesia in high-risk patients qualified for the TAVI procedure (transcatheter aortic valve implantation). In addition, the authors' aim was also to point out to the special challenges of an anaesthesiologist conducting local anaesthesia in such a type of procedures and to evaluate the safety and efficacy of the TAVI procedure conducted under remifentanil analgosedation...
February 14, 2017: Anaesthesiology Intensive Therapy
Chung-Hsin Lee, Chih-Hsiang Liao, Wen-Hsien Chen, Hsu-Tung Lee, Yuang-Seng Tsuei
Morphologic characteristics of angiographic doughnut-shaped aneurysms of the intracranial internal carotid artery (ICA) have been rarely reported in the literature and were discussed only radiologically. In this case, surgical clipping was performed, and the specimen from the aneurysm was examined to correlate the pathologic findings and morphologic characteristics. A 59-year-old male presented with diffuse subarachnoid hemorrhage secondary to a ruptured vascular lesion originating from the intracranial portion of the right ICA...
February 10, 2017: Acta Neurochirurgica
Xiaona Luo, Kai Ma, Tifeng Jiao, Ruirui Xing, Lexin Zhang, Jingxin Zhou, Bingbing Li
The effective synthesis and self-assembly of graphene oxide (GO) nanocomposites are of key importance for a broad range of nanomaterial applications. In this work, a one-step chemical strategy is presented to synthesize stable GO-polymer Langmuir composite films by interfacial thiol-ene photopolymerization at room temperature, without use of any crosslinking agents and stabilizing agents. It is discovered that photopolymerization reaction between thiol groups modified GO sheets and ene in polymer molecules is critically responsible for the formation of the composite Langmuir films...
December 2017: Nanoscale Research Letters
Yongfang Yang, Li Hua, Yue Zhang, Hefang Wang, Lidong Xu, Hanying Zhao
The hybrid nanocrystals---PVBA-b-PS/ZIF-8 were prepared by the growth of ZIF-8 on the surface of the self-assembled structures from poly(p-vinylbenzoic acid)-block-polystyrene. Two different morphologies---micelles and vesicles were obtained in selective solvents owing to the different ratios of PVBA to PS blocks. The structure and morphology of the PVBA-b-PS/ZIF-8 composites were characterized by Fourier transform infrared spectroscopy, thermogravimetric analysis, X-ray diffraction, transmission electron microscopy and scanning electron microscopy...
February 8, 2017: Chemistry, An Asian Journal
David J Beard, Jonathan A Cook
Space medicine offers some unique challenges, especially in terms of research methodology. A specific challenge for astronaut reconditioning involves identification of what aspects of terrestrial research methodology hold and which require modification. This paper reviews this area and presents appropriate solutions where possible. It is concluded that spaceflight rehabilitation research should remain question/problem driven and is broadly similar to the terrestrial equivalent on small populations, such as rare diseases and various sports...
January 2017: Musculoskelet Sci Pract
Blandine Maurel, Adrien Hertault, Lucie Salomon du Mont, Sébastien Cazaban, Simon Rinckenbach
AIM: To evaluate radiation exposure, endovascular theatre equipment and practices in France during iliac angioplasty. METHODS: A prospective observational study was performed among vascular surgeons who attended a half day of radiation safety training in 2012 and 2015 and had to collect data on 3 patients undergoing iliac procedure. In 2012, 330 surgeons performed 899 procedures, compared to 114 surgeons and 338 procedures in 2015. Due to exclusions, 653 and 306 procedures were analysed in 2012 and 2015, respectively...
January 31, 2017: Annals of Vascular Surgery
Felipe G S Santos, Yovanny A V Espinel, Gustavo O Luiz, Rodrigo S Benevides, Gustavo S Wiederhecker, Thiago P Mayer Alegre
Optomechanical cavities have proven to be an exceptional tool to explore fundamental and applied aspects of the interaction between mechanical and optical waves. Here we demonstrate a novel optomechanical cavity based on a disk with a radial mechanical bandgap. This design confines light and mechanical waves through distinct physical mechanisms which allows for independent control of the mechanical and optical properties. Simulations foresee an optomechanical coupling rate g<sub>0</sub> reaching 2π × 100 kHz for mechanical frequencies around 5 GHz as well as anchor loss suppression of 60 dB...
January 23, 2017: Optics Express
Shoujun Zheng, Fucai Liu, Chao Zhu, Zheng Liu, Hong Jin Fan
Due to the strong electron-electron and electron-phonon interactions, the transition metal dichalcogenide 1T-TaS2 exhibits temperature dependent as well as electric field driven charge density wave (CDW) phase transitions (PTs). In this work, we investigate the thickness dependence of the electric field driven PT in 1T-TaS2 two-dimensional (2D) flakes. Electrically driven PT between high- and low-resistance states occurs at temperatures in the range of 60-300 K. For a thin 1T-TaS2 (≤8.8 nm) sample, only one PT is triggered, whereas thick films experience double PTs (13-17 nm) and multiple PTs (≥17...
February 2, 2017: Nanoscale
Joanna Jankowska, Oleg V Prezhdo
Hybrid organic-inorganic perovskites show impressive potential for photovoltaic applications and currently give rise to one of the most vibrant research areas in the field. Until recently, the electrostatic interactions between their organic and inorganic components were considered mostly for stabilization of the fragile perovskite structure. We study the effect of local interactions of polar C-N bonds in the organic layer on the nonradiative electron-hole recombination in the recently reported room-temperature ferroelectric hybrid perovskite, (benzylammonium)2PbCl4...
February 6, 2017: Journal of Physical Chemistry Letters
Michael Kostrzewa, Kerim Kara, Nils Rathmann, Charalambos Tsagogiorgas, Thomas Henzler, Stefan O Schoenberg, Peter Hohenberger, Steffen J Diehl, Eric D Roessner
OBJECTIVES: Minimally invasive resection of small, deep intrapulmonary lesions can be challenging due to the difficulty of localizing them during video-assisted thoracoscopic surgery (VATS). We report our preliminary results evaluating the feasibility of an image-guided, minimally invasive, 1-stop-shop approach for the resection of small, deep intrapulmonary lesions in a hybrid operating room (OR). MATERIALS AND METHODS: Fifteen patients (5 men, 10 women; mean age, 63 years) with a total of 16 solitary, deep intrapulmonary nodules of unknown malignant status were identified for intraoperative wire marking...
January 30, 2017: Investigative Radiology
Shota Kato, Yutaka Saga, Masahiro Kojima, Hiromu Fuse, Shigeki Matsunaga, Arisa Fukatsu, Mio Kondo, Shigeyuki Masaoka, Motomu Kanai
Hybrid catalyst systems to achieve acceptorless dehydrogenation of N-heterocycles and tetrahydronaphthalenes-model substrates for liquid organic hydrogen carriers-were developed. A binary hybrid catalysis comprising an acridinium photoredox catalyst and a Pd metal catalyst was effective for the dehydrogenation of N-heterocycles, whereas a ternary hybrid catalysis comprising an acridinium photoredox catalyst, a Pd metal catalyst, and a thiophosphoric imide organocatalyst achieved dehydrogenation of tetrahydronaphthalenes...
February 6, 2017: Journal of the American Chemical Society
Satyaprasad P Senanayak, Bingyan Yang, Tudor H Thomas, Nadja Giesbrecht, Wenchao Huang, Eliot Gann, Bhaskaran Nair, Karl Goedel, Suchi Guha, Xavier Moya, Christopher R McNeill, Pablo Docampo, Aditya Sadhanala, Richard H Friend, Henning Sirringhaus
Fundamental understanding of the charge transport physics of hybrid lead halide perovskite semiconductors is important for advancing their use in high-performance optoelectronics. We use field-effect transistors (FETs) to probe the charge transport mechanism in thin films of methylammonium lead iodide (MAPbI3). We show that through optimization of thin-film microstructure and source-drain contact modifications, it is possible to significantly minimize instability and hysteresis in FET characteristics and demonstrate an electron field-effect mobility (μFET) of 0...
January 2017: Science Advances
Cezary Czaplewski, Krzysztof Smalara, Artur Giełdoń, Maciej Bobrowski
The p-xylylene monomers of parylene N, C and D have similar high polymerization reactivity. For effective copolymerization processes this fact is basically a drawback and for instance the copolymerization with styrene doesn't go at all (Corley et al. J Pol Sc 13(68):137-156, [15]). Substitution of terminal hydrogen atoms by chlorine atoms reduces reactivity dramatically. 7,7,8,8-tetrachloro-p-xylylene and 2,5,7,7,8,8-hexachloro-p-xylylene can be isolated as yellow crystals. These crystals can be kept without any change in temperature below 0 (∘)C, but they polymerize slowly at room temperature...
February 2017: Journal of Molecular Modeling
Changyi Li, Jeremy B Wright, Sheng Liu, Ping Lu, Jeffrey J Figiel, Benjamin Leung, Weng W Chow, Igal Brener, Daniel D Koleske, Ting-Shan Luk, Daniel F Feezell, S R J Brueck, George T Wang
We report lasing from nonpolar p-i-n InGaN/GaN multi-quantum well core-shell single-nanowire lasers by optical pumping at room temperature. The nanowire lasers were fabricated using a hybrid approach consisting of a top-down two-step etch process followed by a bottom-up regrowth process, enabling precise geometrical control and high material gain and optical confinement. The modal gain spectra and the gain curves of the core-shell nanowire lasers were measured using micro-photoluminescence and analyzed using the Hakki-Paoli method...
January 24, 2017: Nano Letters
Nicolas Loy Rodas, Fernando Barrera, Nicolas Padoy
GOAL: We present an approach to provide awareness to the harmful ionizing radiation generated during X-ray guided minimally invasive procedures. METHODS: A hand-held screen is used to display directly in the user's view information related to radiation safety in a mobile augmented reality (AR) manner. Instead of using markers, we propose a method to track the observer's viewpoint which relies on the use of multiple RGB-D sensors and combines equipment detection for tracking initialization with a KinectFusion-like approach for frame-to-frame tracking...
April 29, 2016: IEEE Transactions on Bio-medical Engineering
Lucas C Flatten, David M Coles, Zhengyu He, David G Lidzey, Robert A Taylor, Jamie H Warner, Jason M Smith
Exciton-polaritons are quasiparticles consisting of a linear superposition of photonic and excitonic states, offering potential for nonlinear optical devices. The excitonic component of the polariton provides a finite Coulomb scattering cross section, such that the different types of exciton found in organic materials (Frenkel) and inorganic materials (Wannier-Mott) produce polaritons with different interparticle interaction strength. A hybrid polariton state with distinct excitons provides a potential technological route towards in situ control of nonlinear behaviour...
January 17, 2017: Nature Communications
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