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https://www.readbyqxmd.com/read/28346825/fabrication-of-nico2-anchored-graphene-nanosheets-by-liquid-phase-exfoliation-for-excellent-microwave-absorber
#1
Ruilong Yang, Bochong Wang, Jianyong Xiang, Congpu Mu, Can Zhang, Fusheng Wen, Cong Wang, Can Su, Zhongyuan Liu
Graphene nanosheets (GNS) were prepared by an efficient liquid phase exfoliation method, and then the NiCo2/GNS nanohybrids were fabricated using the single-mode microwave-assisted hydrothermal technique. The NiCo2/GNS composites with different GNS proportion were investigated as a microwave absorber. Morphology investigation suggested that NiCo2 nanocrystals were uniformly anchored on the GNS without aggregation. The electromagnetic parameters of NiCo2/GNS nanohybrids could be artificially adjusted by changing the GNS proportion, which led to an exceptional microwave absorbing performance...
March 27, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28345996/effects-of-repeated-use-and-resterilization-on-structural-and-functional-integrity-of-microwave-ablation-antennas
#2
Cyrielle A Finck, Alex R Zur Linden, Ameet Singh, Robert A Foster, Stephanie G Nykamp, William C Sears
OBJECTIVE To determine effects of repeated use and resterilization on structural and functional integrity of microwave ablation (MWA) antennas. SAMPLE 17 cooled-shaft MWA antennas (3 groups of 5 antennas/group and 2 control antennas). PROCEDURES 1, 2, and 3 ablations in the livers of bovine cadavers were performed at the maximum recommended settings. Antennas were cleaned and sterilized in hydrogen peroxide plasma, and the process was repeated (reprocessing cycle; n = 6). Control antennas were only sterilized (6 times)...
April 2017: American Journal of Veterinary Research
https://www.readbyqxmd.com/read/28345911/subtle-microwave-induced-overheating-effects-in-an-industrial-de-methylation-reaction-and-their-direct-use-in-the-development-of-an-innovative-microwave-reactor
#3
Mario De Bruyn, Vitaliy L Budarin, Guido S J Sturm, Georgios D Stefanidis, Marilena Radoiu, Andrzej Stankiewicz, Duncan J Macquarrie
A systematic study of the conventional and microwave (MW) kinetics of an industrially relevant demethylation reaction is presented. In using industrially relevant reaction conditions the dominant influence of the solvent on the MW energy dissipation is avoided. Below the boiling point, the effect of MWs on the activation energy Ea and k0 is found non-existent. Interestingly under reflux conditions the microwave heated (MWH) reaction displays very pronounced zero order kinetics, displaying a much higher reaction rate than observed for the conventionally thermal heated (CTH) reaction...
March 27, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28345885/synthesis-of-highly-uniform-and-compact-lithium-zinc-ferrite-ceramics-via-an-efficient-low-temperature-approach
#4
Fang Xu, Yulong Liao, Dainan Zhang, Tingchuan Zhou, Jie Li, Gongwen Gan, Huaiwu Zhang
LiZn ferrite ceramics with high saturation magnetization (4πMs) and low ferromagnetic resonance line widths (ΔH) represent a very critical class of material for microwave ferrite devices. Many existing approaches emphasize promotion of the grain growth (average size is 10-50 μm) of ferrite ceramics to improve the gyromagnetic properties at relatively low sintering temperatures. This paper describes a new strategy for obtaining uniform and compact LiZn ferrite ceramics (average grains size is ∼2 μm) with enhanced magnetic performance by suppressing grain growth in great detail...
March 27, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28345858/enhanced-absorption-performance-of-carbon-nanostructure-based-metamaterials-and-tuning-impedance-matching-behavior-by-an-external-ac-electric-field
#5
Reza Gholipur, Zahra Khorshidi, Ali Bahari
Metamaterials have surprisingly broadened the range of available practical applications in new devices such as shielding, microwave absorbing, and novel antenna. More researches are related to the tuning DNG frequency bands of ordered or disordered metamaterials, and far less research has focused on the importance of impedance matching behavior, and is not effort and attention in adjusting the magnitude of negative permittivity values. This is particularly important if devices deal with low amplitude signals such as radio or TV antenna...
March 27, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28345350/boron-enhanced-growth-of-micron-length-carbon-based-nanowalls-a-route-towards-high-rates-electrochemical-biosensing
#6
Katarzyna Siuzdak, Mateusz Ficek, Michal Sobaszek, Jacek Ryl, Marcin Gnyba, Paweł Niedziałkowski, Natalia Malinowska, Jakub Karczewski, Robert Bogdanowicz
In this study we have demonstrated the fabrication of novel material called boron-doped carbon nanowalls (B:CNW) which is characterized by remarkable electrochemical properties like high standard rate constant k°, low peak to peak separation value (ΔE) for oxidation and reduction processes of [Fe(CN)6]3-/4- redox system and low surface resistivity. The B:CNW samples were deposited by the microwave plasma assisted chemical vapor deposition (CVD) using a gas mixture of H2:CH4:B2H6 and N2. Growth results in sharp edge, flat and long carbon nanowalls rich in sp2 as well as sp3 hybridized phases...
March 27, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28345129/the-effect-of-microwave-on-the-interaction-of-flavor-compounds-with-g-actin-from-grass-carp-catenopharyngodon-idella
#7
Xiaowei Lou, Qiuli Yang, Yangying Sun, Daodong Pan, Jinxuan Cao
BACKGROUND: In order to investigate the influence of non-thermal effects of microwaves on the flavor of fish and meat products, the G-actin of grass carp in ice baths was exposed to different microwave powers (0, 100, 300 or 500 W); the surface hydrophobicity, sulphydryl contents, secondary structures and adsorption capacity of G-actin to ketones were determined. RESULTS: As microwave power increased from 0 to 300 W, the surface hydrophobicity, total and reactive sulphydryls increased; α-helix, β-sheet and random coil fractions turned into β-turn fractions...
March 26, 2017: Journal of the Science of Food and Agriculture
https://www.readbyqxmd.com/read/28344094/controlled-release-of-antibiotic-amoxicillin-drug-using-carboxymethyl-cellulose-cl-poly-itaconic-acid-co-lactic-acid-hydrogel
#8
S Sood, Vinod Kumar Gupta, Shilpi Agarwal, Kamal Dev, Deepak Pathania
In this paper, microwave assisted preparation of carboxymethyl cellulose-cl-poly(lactic acid-co-itaconic acid) (CMC-cl-P(LA-co-IA)) hydrogel was reported via facile graft copolymerization using N, N(1)-methylene-bis-acrylamide (MBA) and potassium persulphate as cross linker and initiator. Different reaction parameters were optimized to achieve good yield. The formation of hydrogel was confirmed by characterization techniques such as Fourier transform infrared spectroscopy, field emission scanning electron microscopy, X-ray diffraction, thermo gravimetric analysis, transmission electron microscopy etc...
March 23, 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/28343103/pd-au-carbon-dots-nanocomposite-facile-synthesis-and-application-as-an-ultrasensitive-electrochemical-biosensor-for-determination-of-colitoxin-dna-in-human-serum
#9
Qitong Huang, Xiaofeng Lin, Jie-Ji Zhu, Qing-Xiao Tong
In this study, a green and fast method was developed to synthesize high-yield carbon dots (CDs) via one-pot microwave treatment of banana peels without using any other surface passivation agents. Then the as-prepared CDs was used as the reducing agent and stabilizer to synthesize a Pd-Au@CDs nanocomposite by a simple sequential reduction strategy. Finally, Pd-Au@CDs nanocomposite modified glassy carbon electrode (Pd-Au@CDs/GCE) was obtained as a biosensor for target DNA after being immobilized a single-stranded probe DNA by a carboxyl ammonia condensation reaction...
March 22, 2017: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/28343056/preliminary-investigation-of-the-microwave-pyrolysis-mechanism-of-sludge-based-on-high-frequency-structure-simulator-simulation-of-the-electromagnetic-field-distribution
#10
Rui Ma, Nana Yuan, Shichang Sun, Peixin Zhang, Lin Fang, Xianghua Zhang, Xuxin Zhao
Under microwave irradiation, raw sludge was pyrolyzed mainly by evaporation of water, with a weight loss ratio of 84.8% and a maximum temperature not exceeding 200°C. High-temperature pyrolysis of SiC sludge could be realized, with a weight loss ratio of 93.4% and a final pyrolysis temperature of 1131.7°C. Variations between the electric field intensity distribution are the main reason for the differences of pyrolysis efficiencies. HFSS simulation showed that the electric field intensity of the raw sludge gradually decreased from 2...
February 20, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28342616/performance-of-leading-artifact-removal-algorithms-assessed-across-microwave-breast-imaging-prototype-scan-configurations
#11
M A Elahi, C Curtis, B R Lavoie, M Glavin, E Jones, E Fear, M O'Halloran
Microwave imaging is a promising imaging modality for the detection of early-stage breast cancer. One of the most important signal processing components of microwave radar-based breast imaging is early-stage artifact removal. Several artifact removal algorithms have been reported in the literature. However, the neighbourhood-based skin subtraction and hybrid artifact removal algorithms have shown particularly promising results in different realistic 3D breast phantoms. For the first time in this paper, both algorithms have been evaluated and compared using the scan approaches of the most common microwave breast imaging prototype systems...
March 2, 2017: Computerized Medical Imaging and Graphics: the Official Journal of the Computerized Medical Imaging Society
https://www.readbyqxmd.com/read/28342308/shape-selective-catalysis-and-surface-enhanced-raman-scattering-studies-using-ag-nanocubes-nanospheres-and-aggregated-anisotropic-nanostructures
#12
Subrata Kundu, Wei Dai, Yunyun Chen, Lian Ma, Yuan Yue, Alexander M Sinyukov, Hong Liang
Three morphologies of silver nanoparticles (Ag NPs) such as nanocubes, aggregated anisotropic Ag NPs, and nanospheres were prepared using polystyrene sulfonate (PSS) and citrate as stabilizing agents utilizing a simple wet-chemical and microwave heating route respectively. Ag nanocubes were prepared within one min through microwave heating whereas anisotropic Ag NPs and spherical Ag NPs via 5 and 30min of normal stirring at room temperature (RT) respectively. The shape effect of three different morphologies of Ag NPs were examined in catalysis reaction and in surface enhanced Raman scattering (SERS) studies...
March 16, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28342124/laparoscopic-image-based-navigation-for-microwave-ablation-of-liver-tumors-a-multi-center-study-laparoscopic-navigation-for-hepatic-ablation
#13
Tinguely Pascale, Fusaglia Matteo, Freedman Jacob, Banz Vanessa, Weber Stefan, Candinas Daniel, Nilsson Henrik
BACKGROUND: Stereotactic navigation technology has been proposed to augment accuracy in targeting intrahepatic lesions for local ablation therapy. This retrospective study evaluated accuracy, efficacy, and safety when using laparoscopic image-guided microwave ablation (LIMA) for malignant liver tumors. METHODS: All patients treated for malignant liver lesions using LIMA at two European centers between 2013 and 2015 were included for analysis. A landmark-based registration technique was applied for intraoperative tumor localization and positioning of ablation probes...
March 24, 2017: Surgical Endoscopy
https://www.readbyqxmd.com/read/28340717/a-rapid-accurate-and-sensitive-method-with-the-new-stable-isotopic-tags-based-on-microwave-assisted-dispersive-liquid-liquid-microextraction-and-its-application-to-the-determination-of-hydroxyl-uv-filters-in-environmental-water-samples
#14
Xiu Li, Guang Chen, Jianjun Liu, Yuxia Liu, Xianen Zhao, Ziping Cao, Lian Xia, Guoliang Li, Zhiwei Sun, Shijuan Zhang, Hua Wang, Jinmao You
A rapid, accurate and sensitive method, using the stable isotope labeling (SIL), microwave-assisted dispersive liquid-liquid micro extraction (MADLLME) and the ultra-high performance liquid chromatography-tandem mass spectrometry (UPLC-MS/MS), was developed and validated for the determination of hydroxyl UV Filters in environmental water samples. A pair of new isotopic tags D0-/D3-1-methylindole-3-acetic acid (D0-/D3-MIAA) is synthesized, with which a simple yet efficient pretreatment MADLLME-SIL is developed...
May 15, 2017: Talanta
https://www.readbyqxmd.com/read/28340392/-237-np-analytical-method-using-239-np-tracers-and-application-to-a-contaminated-nuclear-disposal-facility
#15
Mathew S Snow, Samuel S Morrison, Sue B Clark, John E Olson, Matthew G Watrous
Environmental (237)Np analyses are challenged by low (237)Np concentrations and lack of an available yield tracer; we report a rapid, inexpensive (237)Np analytical approach employing the short lived (239)Np (t1/2 = 2.3 days) as a chemical yield tracer followed by (237)Np quantification using inductively coupled plasma-mass spectrometry. (239)Np tracer is obtained via separation from a (243)Am stock solution and standardized using gamma spectrometry immediately prior to sample processing. Rapid digestions using a commercial, 900 W "Walmart" microwave and Parr microwave vessels result in 99...
March 21, 2017: Journal of Environmental Radioactivity
https://www.readbyqxmd.com/read/28339239/photon-statistics-of-propagating-thermal-microwaves
#16
J Goetz, S Pogorzalek, F Deppe, K G Fedorov, P Eder, M Fischer, F Wulschner, E Xie, A Marx, R Gross
In experiments with superconducting quantum circuits, characterizing the photon statistics of propagating microwave fields is a fundamental task. We quantify the n^{2}+n photon number variance of thermal microwave photons emitted from a blackbody radiator for mean photon numbers, 0.05≲n≲1.5. We probe the fields using either correlation measurements or a transmon qubit coupled to a microwave resonator. Our experiments provide a precise quantitative characterization of weak microwave states and information on the noise emitted by a Josephson parametric amplifier...
March 10, 2017: Physical Review Letters
https://www.readbyqxmd.com/read/28339232/noiseless-quantum-measurement-and-squeezing-of-microwave-fields-utilizing-mechanical-vibrations
#17
C F Ockeloen-Korppi, E Damskägg, J-M Pirkkalainen, T T Heikkilä, F Massel, M A Sillanpää
A process which strongly amplifies both quadrature amplitudes of an oscillatory signal necessarily adds noise. Alternatively, if the information in one quadrature is lost in phase-sensitive amplification, it is possible to completely reconstruct the other quadrature. Here we demonstrate such a nearly perfect phase-sensitive measurement using a cavity optomechanical scheme, characterized by an extremely small noise less than 0.2 quanta. The device also strongly squeezes microwave radiation by 8 dB below vacuum...
March 10, 2017: Physical Review Letters
https://www.readbyqxmd.com/read/28339224/optical-manipulation-of-a-magnon-photon-hybrid-system
#18
C Braggio, G Carugno, M Guarise, A Ortolan, G Ruoso
We demonstrate an all-optical method for manipulating the magnetization in a 1-mm yttrium-iron-garnet (YIG) sphere placed in a ∼0.17  T uniform magnetic field. A harmonic of the frequency comb delivered by a multi-GHz infrared laser source is tuned to the Larmor frequency of the YIG sphere to drive magnetization oscillations, which in turn give rise to a radiation field used to thoroughly investigate the phenomenon. The radiation damping issue that occurs at high frequency and in the presence of highly magnetizated materials has been overcome by exploiting the magnon-photon strong coupling regime in microwave cavities...
March 10, 2017: Physical Review Letters
https://www.readbyqxmd.com/read/28339183/tunable-porosity-of-crosslinked-polyhedral-oligomeric-silsesquioxane-poss-supports-for-palladium-catalyzed-aerobic-alcohol-oxidation-in-water
#19
Preeyanuch Sangtrirutnugul, Thanawat Chaiprasert, Warodom Hunsiri, Thanudkit Jitjaroendee, Patsaya Songkhum, Kritapas Laohhasurayotin, Tanakorn Osotchan, Vuthichai Ervithayasuporn
Polyhedral oligomeric silsesquioxane (POSS)-based materials, poly-POSS-Tn [n = 8 (1), 10 (2), 12 (3), and mix (4)], were prepared in high yields via free radical polymerization of corresponding pure forms of methacrylate-functionalized POSS monomers, MMA-POSS-Tn (n = 8, 10, 12), and the mixture form, MMA-POSS-Tmix. Powder X-ray diffraction (XRD) spectra and BET analysis indicate that 1-4 are amorphous materials with high surface areas (683-839 m2•g-1). The surface areas and total pore volumes follow the trend: poly-POSS-T12 > poly-POSS-T10 > poly-POSS-Tmix > poly-POSS-T8...
March 24, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28338629/study-of-the-accumulation-of-toxic-and-essential-ultra-trace-elements-in-fruits-of-sorbus-domestica-l
#20
Michaela Zeiner, Iva Juranović Cindrić, Boris Majić, Gerhard Stingeder
In the present work, the accumulation of selected toxic and essential ultra-trace elements in fruits of service tree (Sorbus domestica L.) were determined depending on harvest time. Samples were collected from the same sampling area in two different years and within one year in September and October (maturity state). Harvesting the fruits in the same area excludes the influence of metals taken up via roots, thus the impact of airborne contamination by heavy metal translocation can be studied. All samples were dried and digested using an acidic microwave assisted digestion system prior to quantification by inductively coupled plasma-sector field mass spectrometry (ICP-SFMS)...
March 24, 2017: International Journal of Environmental Research and Public Health
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