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https://www.readbyqxmd.com/read/28094498/barium-titanate-film-interfaces-for-hybrid-composite-energy-harvesters
#1
Christopher C Bowland, Mohammad H Malakooti, Henry A Sodano
Energy harvesting utilizing piezoelectric materials has become an attractive approach for converting mechanical energy into electrical power for low-power electronics. Structural composites are ideally suited for energy scavenging due to the large amount of mechanical energy they are subjected to. Here, a multifunctional composite with embedded sensing and energy harvesting is developed by integrating an active interface into carbon fiber reinforced polymer composites. By modifying the composite matrix, both rigid and flexible multifunctional composites are fabricated...
January 17, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28094026/nanoporous-hydroxyapatite-sodium-titanate-bilayer-on-titanium-implants-for-improved-osteointegration
#2
A Carradò, F Perrin-Schmitt, Q V Le, M Giraudel, C Fischer, G Koenig, L Jacomine, L Behr, A Chalom, L Fiette, A Morlet, G Pourroy
OBJECTIVE: The aim of this study was to improve the strength and quality of the titanium-hydroxyapatite interface in order to prevent long-term failure of the implanted devices originating from coating delamination and to test it in an in-vivo model. METHODS: Ti disks and dental commercial implants were etched in Kroll solution. Thermochemical treatments of the acid-etched titanium were combined with sol-gel hydroxyapatite (HA) coating processes to obtain a nanoporous hydroxyapatite/sodium titanate bilayer...
January 13, 2017: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/28079222/infrared-characterisation-of-acetonitrile-and-propionitrile-aerosols-under-titan-s-atmospheric-conditions
#3
C Ennis, R Auchettl, M Ruzi, E G Robertson
Pure, crystalline acetonitrile (CH3CN) and propionitrile (CH3CH2CN) particles were formed in a collisional cooling cell allowing for infrared (IR) signatures to be compiled from 50 to 5000 cm(-1). The cell temperature and pressure conditions were controlled to simulate Titan's lower atmosphere (80-130 K and 1-100 mbar), allowing for the comparison of laboratory data to the spectra obtained from the Cassini-Huygens mission. The far-IR features confirmed the morphology of CH3CN aerosols as the metastable β-phase (monoclinic) ice, however, a specific crystalline phase for CH3CH2CN could not be verified...
January 12, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28067807/air-coupled-low-frequency-ultrasonic-transducers-and-arrays-with-pmn-32-pt-piezoelectric-crystals
#4
Rymantas J Kazys, Reimondas Sliteris, Justina Sestoke
Air-coupled ultrasonic techniques are being increasingly used for material characterization, non-destructive evaluation of composite materials using guided waves as well as for distance measurements. Application of those techniques is mainly limited by the big losses of ultrasonic signals due to attenuation and mismatch of the acoustic impedances of ultrasonic transducers and air. One of the ways to solve this problem is by application of novel more efficient piezoelectric materials like lead magnesium niobate-lead titanate (PMN-PT) type crystals...
January 6, 2017: Sensors
https://www.readbyqxmd.com/read/28067360/photoelectrochemical-water-splitting-with-a-srtio3-nb-srtio3-n-n-homojunction-structure
#5
Jiajie Cen, Qiyuan Wu, Danhua Yan, Jing Tao, Kim Kisslinger, Mingzhao Liu, Alexander Orlov
A very limited knowledge exists about the effect of non-uniform doping of epitaxially grown strontium titanate thin film electrodes on their photoelectrochemical performance in water splitting. In this work, water splitting photoanodes featuring an n(+)-n homojunction were fabricated by the pulsed laser deposition technique, where epitaxial SrTiO3 thin films were grown on Nb doped n(+)-SrTiO3 single crystalline substrates. Thermal diffusion of niobium from doped substrates into the deposited thin films formed an n(+)-n homojunction, which was profiled by angle-resolved XPS and cross-sectional STEM-EDX techniques...
January 9, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28060706/comparison-of-the-thermal-degradation-of-heavily-nb-doped-and-normal-pzt-thin-films
#6
Jeong-Suong Yang, Yunsung Kang, Inyoung Kang, Seungmo Lim, Seung-Joo Shin, Jungwon Lee, Kangheon Hur
The degradation of Niobium-doped lead zirconate titanate (PZT) and two types of PZT thin films were investigated. Undoped PZT, 2-step PZT and heavily Nb-doped PZT (PNZT) around the morphotropic phase boundary (MPB) were in-situ deposited under optimum condition by RF-magnetron sputtering. All 2 μm thick films had dense perovskite columnar grain structure and self-polarized (100) dominant orientation. PZT thin films were deposited on Pt/TiOx bottom electrode on Si wafer, and Nb doped PZT thin film was on Ir/TiW electrode with help of orientation control...
January 4, 2017: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
https://www.readbyqxmd.com/read/28055988/tunable-pyroelectric-properties-of-barium-strontium-titanate-thin-films
#7
Vladimir Shirokov, Anna Razumnaya, Yu Yuzyuk
We studied the influence of the induced strain and applied electric field on the ground state of ferroelectric Ba0.7Sr0.3TiO3 thin films, deposited on the cubic (001) substrate. The dependence of the pyroelectric coefficient on the applied field is calculated for the different values of the induced strain. We found that tuning of the misfit strain in the film under the dielectric bolometer mode by the proper selection of substrate makes it possible to create the structures with very large values of the pyroelectric coefficient...
January 5, 2017: Journal of Physics. Condensed Matter: An Institute of Physics Journal
https://www.readbyqxmd.com/read/28052049/thermoelectric-pyroelectric-hybrid-energy-generation-from-thermopower-waves-in-core-shell%C3%A2-structured-carbon-nanotube-pzt-nanocomposites
#8
Taehan Yeo, Hayoung Hwang, Dongjoon Shin, Byungseok Seo, Wonjoon Choi
There is an urgent need to develop a suitable energy source owing to the rapid development of various innovative devices using micro-nanotechnology. The thermopower wave (TW), which produces a high specific power during the combustion of solid fuel inside micro-nanostructure materials, is a unique energy source for unusual platforms that cannot use conventional energy sources. Here, we report on the significant enhancement of hybrid energy generation of pyroelectrics and thermoelectrics from TWs in carbon nanotube (CNT)-PZT (lead zirconate titanate, P(Z0...
January 4, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28050877/gas-transport-properties-of-polybenzimidazole-and-poly-phenylene-oxide-mixed-matrix-membranes-incorporated-with-pda-functionalised-titanate-nanotubes
#9
V Giel, M Perchacz, J Kredatusová, Z Pientka
Functionalised titanate nanotubes (TiNTs) were incorporated to poly(5,5-bisbenzimidazole-2,2-diyl-1,3-phenylene) (PBI) or poly(2,6-dimethyl-1,4-phenylene oxide) (PPO) for improving the interfacial compatibility between the polymer matrix and inorganic material and for altering the gas separation performance of the neat polymer membranes. Functionalisation consisted in oxidative polymerisation of dopamine-hydrochloride on the surface of non-functionalised TiNTs. Transmission electron microscopy (TEM) confirmed that a thin polydopamine (PDA) layer was created on the surface of TiNTs...
December 2017: Nanoscale Research Letters
https://www.readbyqxmd.com/read/28049411/accelerating-metagenomic-read-classification-on-cuda-enabled-gpus
#10
Robin Kobus, Christian Hundt, André Müller, Bertil Schmidt
BACKGROUND: Metagenomic sequencing studies are becoming increasingly popular with prominent examples including the sequencing of human microbiomes and diverse environments. A fundamental computational problem in this context is read classification; i.e. the assignment of each read to a taxonomic label. Due to the large number of reads produced by modern high-throughput sequencing technologies and the rapidly increasing number of available reference genomes software tools for fast and accurate metagenomic read classification are urgently needed...
January 3, 2017: BMC Bioinformatics
https://www.readbyqxmd.com/read/28047308/tu-ab-brc-09-fast-dose-averaged-let-and-biological-dose-calculations-for-proton-therapy-using-graphics-cards
#11
H Wan, Chan Tseung, C Beltran
PURPOSE: To demonstrate fast and accurate Monte Carlo (MC) calculations of proton dose-averaged linear energy transfer (LETd) and biological dose (BD) on a Graphics Processing Unit (GPU) card. METHODS: A previously validated GPU-based MC simulation of proton transport was used to rapidly generate LETd distributions for proton treatment plans. Since this MC handles proton-nuclei interactions on an event-by-event using a Bertini intranuclear cascade-evaporation model, secondary protons were taken into account...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28046330/su-g-tep1-15-toward-a-novel-gpu-accelerated-deterministic-solution-to-the-linear-boltzmann-transport-equation
#12
R Yang, B Fallone, J St Aubin
PURPOSE: To develop a Graphic Processor Unit (GPU) accelerated deterministic solution to the Linear Boltzmann Transport Equation (LBTE) for accurate dose calculations in radiotherapy (RT). A deterministic solution yields the potential for major speed improvements due to the sparse matrix-vector and vector-vector multiplications and would thus be of benefit to RT. METHODS: In order to leverage the massively parallel architecture of GPUs, the first order LBTE was reformulated as a second order self-adjoint equation using the Least Squares Finite Element Method (LSFEM)...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28044465/in-situ-quantification-of-diverse-titanium-dioxide-nanoparticles-unveils-selective-endoplasmic-reticulum-stress-dependent-toxicity
#13
Marina Simon, Gladys Saez, Giovanna Muggiolu, Magali Lavenas, Quentin Le Trequesser, Claire Michelet, Guillaume Devès, Philippe Barberet, Eric Chevet, Denis Dupuy, Marie-Hélène Delville, Hervé Seznec
Although titanium dioxide nanoparticles (TiO2 NPs) have been extensively studied, their possible impact on health due to their specific properties supported by their size and geometry, remains to be fully characterized to support risk assessment. To further document NPs biological effects, we investigated the impact of TiO2 NPs morphology on biological outcomes. To this end, TiO2 NPs were synthesized as nanoneedles (NNs), titanate scrolled nanosheets (TNs), gel-sol-based isotropic nanoparticle (INPs) and tested for perturbation of cellular homeostasis (cellular ion content, cell proliferation, stress pathways) in three cell types and compared to the P25...
January 3, 2017: Nanotoxicology
https://www.readbyqxmd.com/read/28038883/orbital-fracture-repair-outcomes-with-preformed-titanium-mesh-implants-and-comparison-to-porous-polyethylene-coated-titanium-sheets
#14
Michelle Y Peng, Shannath L Merbs, Michael P Grant, Nicholas R Mahoney
BACKGROUND: Restoration of orbital volume after internal orbital fractures can prevent enophthalmos. A variety of allografts are commonly used including titanium mesh with and without porous polyethylene coating. Some controversy exists over the use of uncoated titanium mesh in the orbit. Newer products contoured to the three dimensional orbital anatomy aim to improve reestablishment of the complex orbital shape though studies of outcomes with their use are limited. METHODS: A retrospective chart review was performed to evaluate surgical outcomes in all patients who underwent orbital fracture repair with DePuy/Synthes titanium MatrixMIDFACE prefabricated implants (PFTi) as compared with porous polyethylene/titanium hybrid implants (PPETi) including Stryker Medpor Titan, MTB, and BTB implants...
December 3, 2016: Journal of Cranio-maxillo-facial Surgery
https://www.readbyqxmd.com/read/28031206/physiological-differences-in-c-neoformans-in-vitro-versus-in-vivo-and-their-effects-on-antifungal-susceptibility
#15
Nina T Grossman, Arturo Casadevall
Cryptococcus neoformans is an environmentally ubiquitous fungal pathogen that primarily causes disease in people with compromised immune systems, particularly those with advanced AIDS. There are estimated to be almost one million cases per year of cryptococcal meningitis in patients with human immunodeficiency virus, leading to over 600,000 annual deaths, with a particular burden in sub-Saharan Africa. Amphotericin B (AMB) and fluconazole (FLC) are key components of cryptococcal meningitis treatment: AMB is used for induction, FLC for consolidation, maintenance, and in occasional individuals, prophylaxis...
December 28, 2016: Antimicrobial Agents and Chemotherapy
https://www.readbyqxmd.com/read/28028541/butterfly-magnetoresistance-quasi-2d-dirac-fermi-surface-and-topological-phase-transition-in-zrsis
#16
Mazhar N Ali, Leslie M Schoop, Chirag Garg, Judith M Lippmann, Erik Lara, Bettina Lotsch, Stuart S P Parkin
Magnetoresistance (MR), the change of a material's electrical resistance in response to an applied magnetic field, is a technologically important property that has been the topic of intense study for more than a quarter century. We report the observation of an unusual "butterfly"-shaped titanic angular magnetoresistance (AMR) in the nonmagnetic Dirac material, ZrSiS, which we find to be the most conducting sulfide known, with a 2-K resistivity as low as 48(4) nΩ⋅cm. The MR in ZrSiS is large and positive, reaching nearly 1...
December 2016: Science Advances
https://www.readbyqxmd.com/read/28027919/physicochemical-characterisation-and-investigation-of-the-bonding-mechanisms-of-api-titanate-nanotube-composites-as-new-drug-carrier-systems
#17
Barbara Sipos, Klára Pintye-Hódi, Zoltán Kónya, András Kelemen, Géza Regdon, Tamás Sovány
Titanate nanotube (TNT) has recently been explored as a new carrier material for active pharmaceutical ingredients (API). The aim of the present work was to reveal the physicochemical properties of API-TNT composites, focusing on the interactions between the TNTs and the incorporated APIs. Drugs belonging to different Biopharmaceutical Classification System (BCS) classes were loaded into TNTs: diltiazem hydrochloride (BCS I.), diclofenac sodium (BCS II.), atenolol (BCS III.) and hydrochlorothiazide (BCS IV...
December 24, 2016: International Journal of Pharmaceutics
https://www.readbyqxmd.com/read/28025571/finite-element-analysis-of-single-cell-stiffness-measurements-using-pzt-integrated-buckling-nanoneedles
#18
Maryam Alsadat Rad, Auwal Shehu Tijjani, Mohd Ridzuan Ahmad, Shehu Muhammad Auwal
This paper proposes a new technique for real-time single cell stiffness measurement using lead zirconate titanate (PZT)-integrated buckling nanoneedles. The PZT and the buckling part of the nanoneedle have been modelled and validated using the ABAQUS software. The two parts are integrated together to function as a single unit. After calibration, the stiffness, Young's modulus, Poisson's ratio and sensitivity of the PZT-integrated buckling nanoneedle have been determined to be 0.7100 N·m(-1), 123.4700 GPa, 0...
December 23, 2016: Sensors
https://www.readbyqxmd.com/read/28024367/fully-printed-stretchable-thin-film-transistors-and-integrated-logic-circuits
#19
Le Cai, Suoming Zhang, Jinshui Miao, Zhibin Yu, Chuan Wang
This paper reports intrinsically stretchable thin-film transistors (TFTs) and integrated logic circuits directly printed on elastomeric polydimethylsiloxane (PDMS) substrates. The printed devices utilize carbon nanotubes and a type of hybrid gate dielectric comprising PDMS and barium titanate (BaTiO3) nanoparticles. The BaTiO3/PDMS composite simultaneously provides high dielectric constant, superior stretchability, low leakage, as well as good printability and compatibility with the elastomeric substrate. Both TFTs and logic circuits can be stretched beyond 50% strain along either channel length or channel width directions for thousands of cycles while showing no significant degradation in electrical performance...
December 27, 2016: ACS Nano
https://www.readbyqxmd.com/read/28001044/formation-and-controlled-growth-of-bismuth-titanate-phases-into-mesoporous-silica-nanoparticles-an-efficient-self-sealing-nanosystem-for-uv-filtering-in-cosmetic-formulation
#20
Gloria Zaccariello, Michele Back, Marta Zanello, Patrizia Canton, Elti Cattaruzza, Pietro Riello, Alessandro Alimonti, Alvise Benedetti
The application of nanosized inorganic UV filters in cosmetic field is limited by their high photocatalytic properties that could induce the degradation or dangerous transformation of the organic molecules in sunscreen formulations. To overcome this problem and simultaneously enlarge the window of filter's absorption, we propose the growth of bismuth titanates BixTiyOz into mesoporous silica nanoparticles (MSN). We investigated the chemical-physical properties by means of XRPD, TEM, UV-vis spectroscopy, N2 physisorption, XPS, and SF-ICP-MS analysis, while the influence on the environment was evaluated through photocatalytic tests...
January 18, 2017: ACS Applied Materials & Interfaces
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