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https://www.readbyqxmd.com/read/29156636/structural-electrical-magnetic-and-resistive-switching-properties-of-the-multiferroic-ferroelectric-bilayer-thin-films
#1
Ming-Cheng Kao, Hone-Zern Chen, San-Lin Young, Kai-Huang Chen, Jung-Lung Chiang, Jen-Bin Shi
Bi0.8Pr0.2Fe0.95Mn0.05O₃/Bi3.96Gd0.04Ti2.95W0.05O12 (BPFMO/BGTWO) bilayer thin films with Multiferroic/Ferroelectric (MF/FE) structures were deposited onto Pt(111)/Ti/SiO₂/Si(100) substrates by using the sol-gel method with rapid thermal annealing. The BPFMO/BGTWO thin films exhibited well-saturated ferromagnetic and ferroelectric hysteresis loops because of the electro-magnetic coupling induced by the MF/FE structure. The remnant magnetization (2Mr) and remnant polarization (2Pr) were 4.6 emu/cm³ and 62 μC/cm², respectively...
November 20, 2017: Materials
https://www.readbyqxmd.com/read/29156631/morphology-and-mechanical-properties-of-polyimide-films-the-effects-of-uv-irradiation-on-microscale-surface
#2
Changzi Qu, Junsong Hu, Xing Liu, Zheng Li, Yanhuai Ding
As an attractive dielectric material, polyimide has been widely used in the field of electronics, aerospace, and automobiles due to its useful mechanical properties and good chemical resistance. UV irradiation was considered to be the main factor related to the damage and failure of polyimide. Here the effects of UV irradiation on the surface morphology and microscale mechanical properties of polyimide films are characterized by atomic force microscopy (AFM). The surface roughness of the UV-irradiated samples developed and the mechanical properties degraded with the radiation dose increased...
November 20, 2017: Materials
https://www.readbyqxmd.com/read/29156338/effect-of-laminaria-japonica-polysaccharides-on-lipids-monolayers-at-the-air-water-surface
#3
Juanjuan Yang, Changchun Hao, Runguang Sun
In this paper, we examined the effect of Laminaria japonica polysaccharides (LJP) on cationic 1,2-Dioleoyl-3-Trimethylammonium-Propane (DOTAP) and anionic 1,2-dipalmitoyl-sn-glycero-3-[phospho-rac-1-glycerol] (DPPG) monolayers at the air-water interface by the pressure-area isotherms (π-A), adsorption curves (π-t) and morphology measurements with atomic force microscopy (AFM) technique. The π-A curves revealed that the isotherms shifted to larger mean molecular area with progressive addition of LJP into subphase for both DOTAP and DPPG monolayers...
November 17, 2017: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/29156313/synthesis-spectroscopic-and-td-dft-quantum-mechanical-study-of-azo-azomethine-dyes-a-laser-induced-trans-cis-trans-photoisomerization-cycle
#4
Anton Georgiev, Anton Kostadinov, Deyan Ivanov, Deyan Dimov, Simeon Stoyanov, Lian Nedelchev, Dimana Nazarova, Denitsa Yancheva
This paper describes the synthesis, spectroscopic characterization and quantum mechanical calculations of three azo-azomethine dyes. The dyes were synthesized via condensation reaction between 4-(dimethylamino)benzaldehyde and three different 4-aminobenzene azo dyes. Quantum chemical calculations on the optimized molecular geometry and electron densities of the trans (E) and cis (Z) isomers and their vibrational frequencies have been computed by using DFT/B3LYP density-functional theory with 6-311++G(d,p) basis set in vacuo...
November 7, 2017: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
https://www.readbyqxmd.com/read/29156235/the-pristine-graphene-produced-by-liquid-exfoliation-of-graphite-in-mixed-solvent-and-its-application-to-determination-of-dopamine
#5
Juan Zhang, Liao Xu, Bo Zhou, Yinyan Zhu, Xiaoqing Jiang
The pristine graphene can be easily prepared in isopropanol-water mixture with salts as assistant via liquid-phase exfoliation method. The concentration of graphene dispersion reaches as high as 0.565 mg/mL. The graphene film prepared by drop-casting method shows an excellent electrical conductivity (7.095 × 10(4) S/m). Furthermore, an electrochemical biosensor based on the pristine graphene shows high selectivity and sensitivity for the determination of dopamine. The linear detection range for dopamine is 2...
November 13, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/29156134/organic-ice-resists
#6
William Tiddi, Anna Elsukova, Hoa Thanh Le, Pei Liu, Marco Beleggia, Anpan Han
Electron-beam lithography (EBL) is the backbone technology for patterning nanostructures and manufacturing nanodevices. It involves processing and handling synthetic resins in several steps, each requiring optimization and dedicated instrumentation in cleanroom environments. Here, we show that simple organic molecules, e.g. alcohols, condensed to form thin-films at low temperature demonstrate resist-like capabilities for EBL applications and beyond. The entire lithographic process takes place in a single instrument, and avoids exposing chemicals to the user and the need of cleanrooms...
November 20, 2017: Nano Letters
https://www.readbyqxmd.com/read/29156131/development-and-performance-characterization-of-a-polyimine-covalent-organic-framework-thin-film-composite-nanofiltration-membrane
#7
Lauren Valentino, Michio Matsumoto, William R Dichtel, Benito J Marinas
Two-dimensional covalent organic frameworks (COFs) were used to create the first asymmetric, thin-film composite (TFC) nanofiltration (NF) membrane with a COF active layer. NF membrane active layers of polyimine COF were synthesized via the interfacial polymerization (IP) of terephthalaldehyde and tris(4-aminophenyl)benzene monomers on top of a polyethersulfone (PES) ultrafiltration membrane support. Rutherford backscattering spectrometry and Fourier transform infrared spectroscopy analyses confirmed the presence of an imine-linked film with a thickness of ~10 nm that was formed reproducibly...
November 20, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/29156098/technical-note-penumbral-width-trimming-in-solid-lung-dose-profiles-for-0-9-t-and-1-5-t-mri-linac-prototypes
#8
Sarah J Alnaghy, Jarrad Begg, Trent Causer, Thahabah Alharthi, Laura Glaubes, Bin Dong, Armia George, Lois Holloway, Peter Metcalfe
PURPOSE: Longitudinal magnetic fields narrow beam penumbra and tighten lateral spread of secondary electrons in air cavities, including lung tissue. Gafchromic(®) EBT3 film was used to investigate differences between penumbra in solid water and solid lung, without a magnetic field (0 T) and with two field strengths (0.9 T and 1.5 T). METHODS: The first prototype of the Australian MRI-linac consisted of a 1.5 T Siemens Sonata MRI and Varian industrial linatron (nominal 4 MV)...
November 20, 2017: Medical Physics
https://www.readbyqxmd.com/read/29155913/probing-electrochemically-induced-resistive-switching-of-tio2-using-spm-techniques
#9
Wanheng Lu, Lai-Mun Wong, Shijie Wang, Kaiyang Zeng
Resistive switching on the nanoscale is an emerging research field and Scanning Probe Microscopy (SPM) is a powerful tool for studies in this area. Under the SPM tip, the electrical field is very high due to the small tip radius on the order of tens of nanometers, and this can enable a range of ionic/electrochemical phenomena during the resistive switching of the materials under the SPM tip. Although the ionic/electrochemical phenomena have long been considered vital for the resistive switching of materials, a few pieces of experimental evidence, as well as the decoupling of the effects of the electrochemical processes at different stages, are still needed...
November 20, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/29155762/high-throughput-analysis-of-locomotor-behavior-in-the-drosophila-island-assay
#10
Ilse Eidhof, Michaela Fenckova, Dei M Elurbe, Bart van de Warrenburg, Anna Castells Nobau, Annette Schenck
Advances in next-generation sequencing technologies contribute to the identification of (candidate) disease genes for movement disorders and other neurological diseases at an increasing speed. However, little is known about the molecular mechanisms that underlie these disorders. The genetic, molecular, and behavioral toolbox of Drosophila melanogaster makes this model organism particularly useful to characterize new disease genes and mechanisms in a high-throughput manner. Nevertheless, high-throughput screens require efficient and reliable assays that, ideally, are cost-effective and allow for the automatized quantification of traits relevant to these disorders...
November 5, 2017: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/29155691/magnetic-fields-are-causing-small-but-significant-changes-of-the-radiochromic-ebt3-film-response-to-6-mv-photons
#11
Bjoern Delfs, Andreas Alexander Schoenfeld, Daniela Poppinga, Ralf-Peter Kapsch, Ping Jiang, Dietrich Harder, Bjoern Poppe, Hui Khee Looe
The optical density (OD) of EBT3 radiochromic exposed to absorbed doses to water up to D = 20 Gy in magnetic fields of B = 0.35 and 1.42 T was measured in three colour channels. A 7 cm wide water phantom with fixed film holder was placed in magnetic fields and was irradiated by a 6 MV photon beam whose axis was directed at right angles with the field lines. The doses at the film position at water depth 5 cm were measured with a calibrated ionization chamber when the magnet was switched off and were converted to the doses in presence of the magnetic field via the monitor units and by a Monte Carlo-calculated correction accounting for the slight change of the depth dose curves in magnetic fields...
November 20, 2017: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/29155583/formation-of-long-lived-color-centers-for-broadband-visible-light-emission-in-low-dimensional-layered-perovskites
#12
Edward P Booker, Tudor H Thomas, Claudio Quarti, Michael R Stanton, Cameron D Dashwood, Alexander J Gillett, Johannes M Richter, Andrew J Pearson, Nathaniel J L K Davis, Henning Sirringhaus, Michael B Price, Neil C Greenham, David Beljonne, Siân E Dutton, Felix Deschler
We investigate the origin of the broadband visible emission in layered hybrid lead-halide perovskites and its connection with structural and photophysical properties. We study <001> oriented thin films of hexylammonium (HA) lead iodide, (C6H16N)2PbI4, and dodecylammonium (DA) lead iodide, (C12H28N)2PbI4 by combining first-principles simulations with time-resolved photoluminescence, steady-state absorption and X-ray diffraction measurements on cooling from 300 K to 4 K. Ultrafast transient absorption and photoluminescence measurements are used to track the formation and recombination of emissive states...
November 20, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/29155561/fabrication-of-csxfa1-xpbi3-mixed-cation-perovskites-via-gas-phase-assisted-compositional-modulation-for-efficient-and-stable-photovoltaic-devices
#13
Paifeng Luo, Shengwen Zhou, Yugang Zhou, Wei Xia, Lin Sun, Jigui Cheng, Chenxi Xu, Yingwei Lu
Over the past few years, significant attention has been focused on HC(NH2)2PbI3 (FAPbI3) perovskite due to their reduced band gap and enhanced thermal stability compared with the most studied CH3NH3PbI3 (MAPbI3). However, FAPbI3 is sensitive to moisture and also encounters serious structural phase-transition from photoactive -phase to photoinactive -phase. Herein, we first develop a novel FAI gas-phase assisted mixed-cation compositional modulation method to fabricate CsxFA1-xPbI3 perovskite solar cells (PSCs), and realize the structural stabilization of -phase FAPbI3 with the incorporation of smaller inorganic Cs+ ions...
November 20, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29155412/tunable-nanostructured-columnar-growth-of-sno2-for-efficient-detection-of-co-gas
#14
Avneet Singh, Anjali Sharma, Monika Tomar, Vinay Gupta
Present work is focused on the growth and modification of the columnar nanostructures of SnO2 using Glancing Angle Deposition (GLAD) assisted rf sputtering technique for low temperature detection of carbon monoxide (CO) gas. GLAD angle and deposition pressure have been optimized to tailor the grow of columnar nanostructures of SnO2, which exhibited enhanced gas sensing response of 1.49×102 towards 500 ppm of CO gas at a comparatively lower operating temperature of 110°C. The enhanced sensing response at low operating temperature is related to the growth of nanoporous columnar structures of SnO2 thin film under GLAD configuration which results in an enhanced interaction of target CO gas molecules with the large surface area of sensing SnO2 thin film...
November 20, 2017: Nanotechnology
https://www.readbyqxmd.com/read/29155398/investigation-of-graphene-on-metal-substrates-for-spr-based-sensor-using-finite-difference-time-domain
#15
Fairus Atida Said, Pulliyaseri Susthitha Menon, Venkatachalam Rajendran, Sahbudin Shaari, Burhanuddin Y Majlis
In this study, the authors investigated the effects of a single layer graphene as a coating layer on top of metal thin films such as silver, gold, aluminum and copper using finite-difference time domain method. To enhance the resolution of surface plasmon resonance (SPR) sensor, it is necessary to increase the SPR reflectivity and decrease the full-width-half maximum (FWHM) of the SPR curve so that there is minimum uncertainty in the determination of the resonance dip. Numerical data was verified with analytical and experimental data where all the data were in good agreement with resonance angle differing in <10% due to noise present in components such as humidity and temperature...
December 2017: IET Nanobiotechnology
https://www.readbyqxmd.com/read/29155388/polyelectrolyte-multilayers-for-bio-applications-recent-advancements
#16
REVIEW
Suman Pahal, Ruchi Gakhar, Ashok M Raichur, Manoj M Varma
The synergistic relationship between structure and the bulk properties of polyelectrolyte multilayer (PEM) films has generated tremendous interest in their application for loading and release of bioactive species. Layer-by-layer assembly is the simplest, cost effective process for fabrication of such PEMs films, leading to one of the most widely accepted platforms for incorporating biological molecules with nanometre precision. The bulk reservoir properties of PEM films render them a potential candidate for applications such as biosensing, drug delivery and tissue engineering...
December 2017: IET Nanobiotechnology
https://www.readbyqxmd.com/read/29155200/recent-advances-on-polysaccharides-lipids-and-protein-based-edible-films-and-coatings-a-review
#17
REVIEW
Bilal Hassan, Shahzad Ali Shahid Chatha, Abdullah Ijaz Hussain, Khalid Mahmood Zia, Naseem Akhtar
Food is a vital product for the survival of human beings and with passage of time quality concerns of consumers are rising. Edible films and coatings are thin layers applied on food products to protect them and improve their quality. Films/coatings are prepared from naturally occurring renewable sources (polysaccharides, proteins, lipids and composites) which we can eat without disposing them. These films are environment friendly and contain antioxidants, anti-browning agents and colorants. Various methods (spraying, brushing, electro-spraying) are used to apply a coating on food material to protect them from microbial growth, prolonging their shelf life and improving other quality aspects like sensory attributes, appearance, originality and freshness of ingredients...
November 16, 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/29155165/bovine-babesiosis-cattle-protected-in-the-field-with-a-frozen-vaccine-containing-babesia-bovis-and-babesia-bigemina-cultured-in-vitro-with-a-serum-free-medium
#18
Carmen Rojas-Martínez, Roger Iván Rodríguez-Vivas, Julio Vicente Figueroa Millán, Carlos Ramón Bautista-Garfias, Roberto Omar Castañeda-Arriola, José Juan Lira-Amaya, Patricia Vargas Urióstegui, Juan José Ojeda Carrasco, Jesús Antonio Álvarez Martínez
An attenuated live vaccine containing Babesia bovis and B. bigemina cultured in vitro with a serum-free medium was assessed for its clinical protection conferred of naïve cattle, under natural tick-challenge in a high endemicity zone to Babesia spp. Three groups of six animals were treated as follows: group I (GI) received a vaccine derived from parasites cultured with a free-serum medium; group II (GII) were immunized with the standard vaccine, with parasites cultured in a medium supplemented with 40% (v/v) bovine serum; and a control group (GIII) inoculated with non-infected bovine erythrocytes...
November 16, 2017: Parasitology International
https://www.readbyqxmd.com/read/29154900/alternative-manufacturing-concepts-for-solid-oral-dosage-forms-from-drug-nanosuspensions-using-fluid-dispensing-and-forced-drying-technology
#19
Bastian Bonhoeffer, Arno Kwade, Michael Juhnke
Flexible manufacturing technologies for solid oral dosage forms with a continuous adjustability of the manufactured dose strength, are of interest for applications in personalized medicine. This study explored the feasibility of using micro-valve technology for the manufacturing of different solid oral dosage form concepts. Hard gelatin capsules filled with excipients, placebo tablets and polymer films, placed in hard gelatin capsules after drying, were considered as substrates. For each concept a basic understanding of relevant formulation parameters and their impact on dissolution behavior has been established...
November 15, 2017: Journal of Pharmaceutical Sciences
https://www.readbyqxmd.com/read/29154877/investigation-the-effect-of-graphene-oxide-and-gelatin-starch-weight-ratio-on-the-properties-of-starch-gelatin-go-nanocomposite-films-the-rsm-study
#20
Shima Afshar, Hossein Banisadi
In this study, we reported the design and fabrication of starch/gelatin/graphene oxide biodegradable nanocomposite films with proper potential for food packaging applications. The experiments were designed using Design Expert software via RSM by defining gelatin/starch weight ratio (G/S wt. ratio) and graphene oxide (GO) wt.% as process parameters affecting on the properties of the prepared films. The optimization was done and various properties of the optimum film were investigated. The XRD and SEM images confirmed that GO layers could intercalate in the starch/gelatin matrix and proper dispersion of nanofillers in the matrix obtained via solution casting method...
November 14, 2017: International Journal of Biological Macromolecules
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