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https://www.readbyqxmd.com/read/28335353/the-chemical-deposition-method-for-the-decoration-of-palladium-particles-on-carbon-nanofibers-with-rapid-conductivity-changes
#1
Hoik Lee, Duy-Nam Phan, Myungwoong Kim, Daewon Sohn, Seong-Geun Oh, Seong Hun Kim, Ick Soo Kim
Palladium (Pd) metal is well-known for hydrogen sensing material due to its high sensitivity and selectivity toward hydrogen, and is able to detect hydrogen at near room temperature. In this work, palladium-doped carbon nanofibers (Pd/CNFs) were successfully produced in a facile manner via electrospinning. Well-organized and uniformly distributed Pd was observed in microscopic images of the resultant nanofibers. Hydrogen causes an increment in the volume of Pd due to the ability of hydrogen atoms to occupy the octahedral interstitial positions within its face centered cubic lattice structure, resulting in the resistance transition of Pd/CNFs...
November 29, 2016: Nanomaterials
https://www.readbyqxmd.com/read/28332816/fluorinated-and-thermo-crosslinked-polyhedral-oligomeric-silsesquioxanes-new-organic-inorganic-hybrid-materials-for-high-performance-dielectric-application
#2
Jiajia Wang, Jing Sun, Junfeng Zhou, Kaikai Jin, Qiang Fang
A fluorinated and thermo-crosslinked polyhedral oligomeric silsesquioxane (POSS) has been successfully synthesized by thermal polymerization of a fluorinated POSS monomer having an inorganic silsesquioxane core and organic side chains bearing thermo-crosslinkable trifluorovinyl ether groups. This new inorganic-organic hybrid polymer shows high thermostability with a 5 wt% loss temperature of 436 C, as well as good transparency (a sheet with an average thickness of 1.5 mm shows high transmittance of 92% varying from 400 to 1,100 nm)...
March 23, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28332670/high-temperature-structural-phase-transition-coupled-with-dielectric-switching-in-an-organic-inorganic-hybrid-crystal-nh3-ch2-2br-3cdbr5
#3
Hai-Peng Chen, Zhong-Xia Wang, Cheng Chen, Yang Lu, Zi Yin, Xiao-Fen Sun, Da-Wei Fu
Molecular bistable switches (electrical switches "ON" and "OFF") represent a class of highly desirable intelligent materials due to their sensitive switchable responses, simple and environmentally friendly processing, light weight, and mechanical flexibility. In particular, these switches above room temperature with potential practical application are rarely reported. In this work, a new zigzag chained organic-inorganic hybrid compound [NH3(CH2)2Br]3CdBr5 (1), which displays rapidly sensitive dielectric switching reversibility and remarkable switching antifatigue, has been successfully synthesized...
March 23, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/28332447/the-effect-of-native-silk-fibroin-powder-on-the-physical-properties-and-biocompatibility-of-biomedical-polyurethane-membrane
#4
Yan Zhuang, Qian Zhang, Jinqi Feng, Na Wang, Weilin Xu, Hongjun Yang
Naturally derived fibers such as silk fibroin can potentially enhance the biocompatibility of currently used biomaterials. This study investigated the physical properties of native silk fibroin powder and its effect on the biocompatibility of biomedical polyurethane. Native silk fibroin powder with an average diameter of 3 µm was prepared on a purpose-built machine. A simple method of phase inversion was used to produce biomedical polyurethane/native silk fibroin powder hybrid membranes at different blend ratios by immersing a biomedical polyurethane/native silk fibroin powder solution in deionized water at room temperature...
April 2017: Proceedings of the Institution of Mechanical Engineers. Part H, Journal of Engineering in Medicine
https://www.readbyqxmd.com/read/28319896/a-dynamic-sandwich-assay-on-magnetic-beads-for-selective-detection-of-single-nucleotide-mutations-at-room-temperature
#5
Junxiu Wang, Guoliang Xiong, Liang Ma, Shihui Wang, Xu Zhou, Lei Wang, Lehui Xiao, Xin Su, Changyuan Yu
Single-nucleotide mutation (SNM) has proven to be associated with a variety of human diseases. Development of reliable methods for the detection of SNM is crucial for molecular diagnosis and personalized medicine. The sandwich assays are widely used tools for detecting nucleic acid biomarkers due to their low cost and rapid signaling. However, the poor hybridization specificity of signal probe at room temperature hampers the discrimination of mutant and wild type. Here, we demonstrate a dynamic sandwich assay on magnetic beads for SNM detection based on the transient binding between signal probe and target...
March 12, 2017: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/28291362/the-elephant-in-the-room-of-density-functional-theory-calculations
#6
Stig Rune Jensen, Santanu Saha, José Flores-Livas, William P Huhn, Volker Blum, Stefan Goedecker, Luca Frediani
Using multiwavelets, we have obtained total energies and corresponding atomization energies for the GGA-PBE and hybrid-PBE0 density functionals for a test set of 211 molecules with an unprecedented and guaranteed μHartree accuracy. These quasi-exact references allow us to quantify the accuracy of standard all-electron basis sets that are believed to be highly accurate for molecules, such as Gaussian-type orbitals (GTOs), all-electron numeric atom-centered orbitals (NAOs) and full-potential augmented plane wave (APW) methods...
March 14, 2017: Journal of Physical Chemistry Letters
https://www.readbyqxmd.com/read/28290195/structural-and-thermal-disorder-of-solution-processed-ch3nh3pbbr3-hybrid-perovskite-thin-films
#7
Christoph Wolf, Joo-Sung Kim, Tae-Woo Lee
We extracted the electronic disorder energy of the organic-inorganic lead-halide hybrid perovskite CH3NH3PbBr3 from temperature-dependent absorption data. We showed that the disorder at room temperature is ~30 meV and is due to strong electron-phonon coupling with the longitudinal-optical mode of energy 16 meV. This mode can be attributed to longitudinal-optical phonons of the inorganic PbBr6 frame; this conclusion highlights the polaronic nature of electronic excitations in CH3NH3PbBr3. We showed that structural disorder is of the same magnitude as thermal disorder...
March 14, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28289670/radiation-hazards-to-vascular-surgeon-and-scrub-nurse-in-mobile-fluoroscopy-equipped-hybrid-vascular-room
#8
Jong Bin Kim, Jaehoon Lee, Kihyuk Park
PURPOSE: The aim of the present study was to identify the radiation hazards to vascular surgeons and scrub nurses working in mobile fluoroscopy equipped hybrid vascular operation rooms; additionally, to estimate cumulative cancer risk due to certain exposure dosages. METHODS: The study was conducted prospectively in 71 patients (53 men and 18 women) who had undergone vascular intervention at our hybrid vascular theater for 6 months. OEC 9900 fluoroscopy was used as mobile C-arm...
March 2017: Annals of Surgical Treatment and Research
https://www.readbyqxmd.com/read/28289497/interventional-therapy-for-pulmonary-embolism
#9
Alan B Lumsden, Erik Suarez
Patients with pulmonary embolism (PE) present with highly variable clinical symptoms and often have accompanying comorbidities. Timely diagnosis and treatment are critical to help prevent recurrence and increased morbidity/mortality. While open surgical thrombectomy was once reserved only for those with massive PE and hemodynamic compromise, it has been reevaluated with a focus on careful patient selection and early intervention. Lately, there has been increased interest in catheter-based interventions and in combining these with an open surgical component to decrease the magnitude of the intervention-for example, direct placement of large-bore thrombectomy devices directly into the right ventricle via sternotomy or subxiphoid approaches...
October 2016: Methodist DeBakey Cardiovascular Journal
https://www.readbyqxmd.com/read/28288446/hybrid-detection-of-target-sequence-dna-based-on-phosphorescence-resonance-energy-transfer
#10
Yanming Miao, Jinzhi Lv, Guiqin Yan
The severe background fluorescence and scattering light of real biological samples or environmental samples largely reduce the sensitivity and accuracy of fluorescence resonance energy transfer sensors based on fluorescent quantum dots (QDs). To solve this problem, we designed a novel target sequence DNA biosensor based on phosphorescent resonance energy transfer (PRET). This sensor relied on Mn-doped ZnS (Mn-ZnS) room-temperature phosphorescence (RTP) QDs/poly-(diallyldimethylammonium chloride) (PDADMAC) nanocomposite (QDs(+)) as the energy donor and the single-strand DNA-ROX as the energy receptor...
March 7, 2017: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/28287189/efficient-photocatalytic-bilirubin-removal-over-the-biocompatible-core-shell-p25-g-c3n4-heterojunctions-with-metal-free-exposed-surfaces-under-moderate-green-light-irradiation
#11
Shifei Kang, Hengfei Qin, Lu Zhang, Yongkui Huang, Xia Bai, Xi Li, Di Sun, Yangang Wang, Lifeng Cui
Highly-monodispersed g-C3N4/TiO2 hybrids with a core/shell structure were synthesized from a simple room temperature impregnation method, in which g-C3N4 was coated through self-assembly on the commercially available Degussa P25 TiO2 nanoparticles. Structural and surface characterizations showed that the presence of g-C3N4 notably affected the light absorption characteristics of TiO2. The g-C3N4/TiO2 heterojunctions with metal-free exposed surfaces were directly used as biocompatible photocatalysts for simulated jaundice phototherapy under low-power green-light irradiation...
March 13, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28282990/validation-and-accuracy-of-intraoperative-ct-scan-using-the-philips-alluraxper-fd20-angiography-suite-for-assessment-of-spinal-instrumentation
#12
Edin Nevzati, Javier Fandino, Bawarjan Schatlo, Michel Heimberg, Serge Marbacher, Luca Remonda, Ali-Reza Fathi
BACKGROUND: With the concept of the hybrid operating room gaining popularity, the authors adapted a hybrid angiographic suite with intraoperative computed tomography (iCT) to evaluate accuracy of pedicle screw placement in spinal fusion. This retrospective review examines how well iCT detected extrapedicular screw violation, to then allow repositioning and potentially avoid revision surgery. METHODS: A total of 36 consecutive patients underwent pedicle screw placement in posterior cervical, thoracic, and lumbosacral spinal fusions...
March 10, 2017: British Journal of Neurosurgery
https://www.readbyqxmd.com/read/28266856/aqueous-solvation-of-smi2-a-born-oppenheimer-molecular-dynamics-density-functional-theory-cluster-approach
#13
A Ramı Rez-Solı S, J I Amaro-Estrada, J Hernández-Cobos, L Maron
We report the results of Born-Oppenheimer molecular dynamics (BOMD) simulations on the aqueous solvation of the SmI2 molecule at room temperature using the cluster microsolvation approach including 32 water molecules. The electronic structure calculations were done using the M062X hybrid exchange-correlation functional in conjunction with the 6-31G** basis sets for oxygen and hydrogen. For the iodine and samarium atoms the Stuttgart-Köln relativistic effective-core potentials were utilized with their associated valence basis sets...
March 14, 2017: Journal of Physical Chemistry. A
https://www.readbyqxmd.com/read/28259671/hybrid-surgery-management-of-giant-hypervascular-tumors-intraoperative-endovascular-embolization-with-microsurgical-resection
#14
Rami O Almefty, Nirav J Patel, Alfred P See, Ian F Dunn, Ossama Al-Mefty, Mohammed Ali Aziz-Sultan
INTRODUCTION: Giant hypervascular intracranial tumors represent a formidable challenge as their size limits surgical control of the blood supply and debulking poses the risk of critical blood loss. Embolization facilitates resection but carries the risk of life-threatening tumor infarction, hemorrhage, or swelling if performed preoperatively. Endovascular intraoperative embolization avoids the fatal risk and allows the surgeon to attend instantly if any complication occurs. CLINICAL PRESENTATION: We report two cases in which combining intraoperative embolization with microsurgical resection in the hybrid operating room was used to safely and successfully remove giant, hypervascular tumors...
March 1, 2017: World Neurosurgery
https://www.readbyqxmd.com/read/28252228/polyoxometalate-polyethylene-glycol-interactions-in-water-from-nano-assemblies-in-water-to-crystal-formation-by-electrostatic-screening
#15
Thomas Buchecker, Xavier Le Goff, Bappaditya Naskar, Arno Pfitzner, Olivier Diat, Pierre Bauduin
In the last decade organic-inorganic hybrid materials have become essential in material science as they combine properties of both building blocks. Nowadays the main routes for their synthesis involve electrostatic coupling, covalent grafting and/or solvent effects. In this field, polyoxometalates (POMs) have emerged as interesting inorganic functional building blocks due to their outstanding prop-erties. In the present work we show that the well-known α-Keggin polyoxometalate, α-PW12O403- (PW), can form hybrid crystalline materials with industrial (neutral) poly-ethylene glycol oligomers (PEG) under mild conditions, i...
March 2, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28252153/defects-in-crystalline-pvdf-a-density-functional-theory-density-functional-tight-binding-study
#16
Saeid Arabnejad, Koichi Yamashita, Sergei Manzhos
We present a comparative density functional theory (DFT) and density functional tight binding (DFTB) study of structures, energetics, vibrational properties as well as electronic structures of the four crystalline phases of polyvinylidene fluoride (PVDF) with different types of defects. For pure phases, the relative energies of PVDF strands (i.e. absent van der Walls bonding) agree well between DFT (using a GGA or a hybrid functional) and DFTB. For crystals, DFTB needs to be calibrated due to deficiencies in the treatment of vdW interactions...
March 2, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28248480/toward-the-understanding-of-selective-si-nano-oxidation-by-atomic-scale-simulations
#17
Umedjon Khalilov, Annemie Bogaerts, Erik C Neyts
The continuous miniaturization of nanodevices, such as transistors, solar cells, and optical fibers, requires the controlled synthesis of (ultra)thin gate oxides (<10 nm), including Si gate-oxide (SiO2) with high quality at the atomic scale. Traditional thermal growth of SiO2 on planar Si surfaces, however, does not allow one to obtain such ultrathin oxide due to either the high oxygen diffusivity at high temperature or the very low sticking ability of incident oxygen at low temperature. Two recent techniques, both operative at low (room) temperature, have been put forward to overcome these obstacles: (i) hyperthermal oxidation of planar Si surfaces and (ii) thermal or plasma-assisted oxidation of nonplanar Si surfaces, including Si nanowires (SiNWs)...
March 1, 2017: Accounts of Chemical Research
https://www.readbyqxmd.com/read/28242523/photocatalytic-removal-of-tetrabromobisphenol-a-by-magnetically-separable-flower-like-biobr-bioi-fe3o4-hybrid-nanocomposites-under-visible-light-irradiation
#18
Shengwang Gao, Changsheng Guo, Song Hou, Li Wan, Qiang Wang, Jiapei Lv, Yuan Zhang, Jianfeng Gao, Wei Meng, Jian Xu
A novel flower-like three-dimensional BiOBr/BiOI/Fe3O4 heterojunction photocatalyst was synthesized using a simple in situ co-precipitation method at room temperature. The hybrid composites were characterized by a couple of techniques including X-ray powder diffraction, scanning electron microscope, transmission electron microscopy, ultraviolet-visible diffuse reflection spectroscopy, Brunauer-Emmett-Teller, X-ray photo-electron spectroscopy, photoluminescence technique, and vibrating sample magnetometer. Fe3O4 nanoparticles were perfectly loaded on the surface of BiOBr/BiOI microspheres...
February 20, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28242408/a-rare-entity-traumatic-thoracic-aortic-injury-in-a-patient-with-aberrant-right-subclavian-artery
#19
Hiten Mohanbhai Patel, Shubhabrata Banerjee, Shahzad Bulsara, Tapish Sahu, Virender K Sheorain, Tarun Grover, Rajiv Parakh
BACKGROUND: Aberrant right subclavian artery is an uncommon entity incidence ranging from 0.5-2.5%. Management of thoracic aortic injury in the presence of such anomalies can be a challenge. We present here a case of traumatic aortic injury which was incidentally found to have an asymptomatic aberrant right subclavian artery. The patient was managed by an endovascular repair of thoracic aortic injury with an endograft and a right carotid to subclavian artery bypass as a hybrid procedure...
February 24, 2017: Annals of Vascular Surgery
https://www.readbyqxmd.com/read/28230878/multifunctional-hybrid-porous-filters-with-hierarchical-structures-for-simultaneous-removal-of-indoor-vocs-dusts-and-microorganisms
#20
Yang Zhao, Ze-Xian Low, Shasha Feng, Zhaoxiang Zhong, Yong Wang, Zhong Yao
Air purification often requires multiple layers of filters with different functions to remove various air pollutants, which lead to high pressure drop, high air flow path and frequent filter replacement. In this work, a novel multifunctional Ag@MWCNTs/Al2O3 hybrid filter with a depth-type hierarchical structure for simultaneous removal of fine particles, microorganisms and VOCs was designed and fabricated. The novel hybrid air filter showed leading air purification performances to date, achieving 82.24% degradation of formaldehyde at room temperature, 99...
February 23, 2017: Nanoscale
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