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Arixin Bo, Jose Alarco, Huaiyong Zhu, Eric R Waclawik, Haifei Zhan, YuanTong Gu
Construction of nano-architectures requires techniques like joint formation and trimming. For ceramic materials, however, it is extremely difficult to form nanojoints by conventional methods like merging. In this work, we demonstrate that ceramic titanate nanowires (NWs) can be joined by spot melting under electron beam (e-beam) irradiation (EBI). The irradiation fuses the contacted spot of titanate NWs yielding an intact nanojoint. Nanojoints with different morphologies can be produced. The joint structures consist of titanium dioxide (TiO2) rutile, anatase and titanate phases in direction away from the e-beam melting spot...
February 17, 2017: ACS Applied Materials & Interfaces
Qiaomei Sun, Qilin Gu, Kongjun Zhu, Rongying Jin, Jinsong Liu, Jing Wang, Jinhao Qiu
Dielectric materials with high permittivity are strongly demanded for various technological applications. While polarization inherently exists in ferroelectric barium titanate (BaTiO3), its high permittivity can only be achieved by chemical and/or structural modification. Here, we report the room-temperature colossal permittivity (~760,000) obtained in xNd: BaTiO3 (x = 0.5 mol%) ceramics derived from the counterpart nanoparticles followed by conventional pressureless sintering process. Through the systematic analysis of chemical composition, crystalline structure and defect chemistry, the substitution mechanism involving the occupation of Nd(3+) in Ba(2+) -site associated with the generation of Ba vacancies and oxygen vacancies for charge compensation has been firstly demonstrated...
February 13, 2017: Scientific Reports
Harsha Narayani, Manu Jose, K Sriram, Satyajit Shukla
Hydrogen titanate (H2Ti3O7) nanotubes/nanosheets (HTN) are emerging class of adsorbent material which possess unique property of activating hydrogen peroxide (H2O2) to generate the reactive oxygen species (ROS), such as superoxide radical ions (O2(.-)) and hydroxyl radicals (·OH), effective in the decomposition of surface-adsorbed dye. However, HTN are non-magnetic which create hurdle in their effective separation from the treated aqueous solution. To overcome this issue, magnetic nanocomposites (HTNF) composed of HTN and maghemite (γ-Fe2O3) nanoparticles have been processed by subjecting the core-shell magnetic photocatalyst consisting of γ-Fe2O3/silica (SiO2)/titania (TiO2), having varying amounts of TiO2 in the shell to the hydrothermal conditions...
February 14, 2017: Environmental Science and Pollution Research International
Maja Mikulic-Petkovsek, Boris Krska, Biljana Kiprovski, Robert Veberic
In this study, biochemical profile of fruits of 9 Sorbus genotypes was analyzed. The content of total sugars ranged from 69.7 g/kg ('Titan') to 217.5 g/kg (Sorbus torminalis) and total organic acids from 17.7 g/kg ('Businka') to 40.2 g/kg (S. torminalis). The highest content of total anthocyanins had 'Burka' (871 mg/kg FW) and 'Businka' (856 mg/kg FW). Quercetin derivatives represented more than 95% of total flavonols. 'Alaja krupnaja' had 3.5- to 29-fold higher rutin content than other analyzed genotypes. S...
February 9, 2017: Journal of Food Science
Mao Xia, Guanhua Wang, Zhiqiang Gu, Zhongxian Qiu, Chunying Rong, Jilin Zhang, Wenli Zhou, Liping Yu, Shixun Lian
The red-emitting phosphor Ca0.8 Zn0.2 TiO3 :Pr(3+) was synthesized using an ethylene glycol (EG)-assisted hydrothermal method. The effects of additional amounts of and order of adding EG, plus hydrothermal temperature, time, and pH on the composition, morphology and optical properties of the titanate phosphors were studied. The crystalline phases of the titanate phosphors were confirmed to be constituted of a series of co-existing CaTiO3 , Zn2 TiO4 and Ca2 Zn4 Ti16 O38 compounds in various proportions that were visualized using an X-ray diffractometer (XRD)...
February 9, 2017: Luminescence: the Journal of Biological and Chemical Luminescence
Ashwathi A Iyer, Elif Ertekin
Recently there has been interest in the use of ferroelectricity to modify a material's surface chemistry and enhance its catalytic properties. When a metal oxide catalyst is supported by a switchable ferroelectric underlayer, modifications to the free surface electronic structure can induce changes to the free energy profile of a gas-surface catalytic reaction that either promote or suppress the reaction. The modification of surface properties results from a combination of interface chemistry, surface reconstructions involving adsorbates, and complex interactions between the two, although these interactions are often not characterized in detail...
February 8, 2017: Physical Chemistry Chemical Physics: PCCP
Rosario C Sausa
We employ fast imaging photography and emission spectroscopy to study plasma plumes resulting from the 248-nm ablation of barium strontium titanate, and we utilize x-ray diffraction analysis and scanning electron microscopy to characterize the deposited thin films. Hydrodynamic plume analyses yield initial velocities of approximately 20  km/s, whereas spectral simulations of the Ba I lines between 739 and 770 nm yield temperatures of approximately 17000 K at early times in vacuum. Analyses of the Stark broadened Ba II lines at 614 and 649 nm reveal an electron number density of approximately 10<sup>+18</sup>  cm<sup>-3</sup> near the surface...
January 20, 2017: Applied Optics
Tao Wan, Bo Qu, Haiwei Du, Xi Lin, Peiyuan Guan, Qianru Lin, Nan Chen, Thiam Teck Tan, Tao Hang, Dewei Chu
In this work, resistance switching behaviours in solution processed chromium (Cr)-doped strontium titanate (SrTiO3) films have been investigated. Undoped SrTiO3 film shows I-V characteristics of typical nonlinear resistor and no resistance hysteresis loops are observed. On the contrary, Cr-doped SrTiO3 films show stable and reversible hysteresis loops, which can be controlled by applying different voltage bias. Based on a series of characterization results, including X-ray diffraction (XRD), Raman and X-ray photoelectron spectroscopy (XPS), we infer that Ti(4+) is substituted by Cr(3+), giving rise to increased concentration of oxygen vacancies...
May 15, 2017: Journal of Colloid and Interface Science
Slađana Žilić, Dejan Dodig, Zorica Basić, Jelena Vančetović, Primož Titan, Nenad Đurić, Nataša Tolimir
Cereals based food is one of the major source of Maillard reaction products in the diet. Free amino acids and reducing sugars are considered to be the main precursors in the formation of these heat-induced compounds. In order to determine genetic resources with reduced potential for acrylamide formation, the content of sugars, as well as free asparagine were analyzed in a total of 30 cultivars of 10 varieties belonging to eight species (Triticum aestivum var. lutescens, T. aestivum var. alba, T. aestivum var...
February 2, 2017: Food Additives & Contaminants. Part A, Chemistry, Analysis, Control, Exposure & Risk Assessment
Guanyao Wang, Xingyi Huang, Pingkai Jiang
Rapid evolution of energy storage devices expedites the development of high-energy-density materials with excellent flexibility and easy processing. The search for such materials has triggered the development of high-dielectric-constant (high-k) polymer nanocomposites. However, the enhancement of k usually suffers from sharp reduction of breakdown strength, which is detrimental to substantial increase of energy storage capability. Herein, the combination of bio-inspired fluoro-polydopamine functionalized BaTiO3 nanowires (NWs) and a fluoropolymer matrix offers a new thought to prepare polymer nanocomposites...
February 13, 2017: ACS Applied Materials & Interfaces
Boyeon Park, Seung Mi Oh, Xiaoyan Jin, Kanyaporn Adpakpang, Nam-Suk Lee, Seong-Ju Hwang
An efficient way to improve the Na-ion electrode activity of graphene-based nanocomposite is developed by employing exfoliated metal oxide nanosheet as an additive. The titanate nanosheet-incorporated Na-SnS₂-reduced graphene oxide (rG-O) nanocomposites can be synthesized by the electrostatically-derived restacking of the colloidal mixture of SnS₂, rG-O, and titanate nanosheets with Na+ cation. The incorporation of titanate into the Na-SnS₂-rG-O nanocomposites is effective in improving the nanoscale mixing of component nanosheets and the porosity of the composite structure...
January 30, 2017: Chemistry: a European Journal
Min-Ho Seo, Jae-Young Yoo, So-Young Choi, Jae-Shin Lee, Kwang-Wook Choi, Chang Kyu Jeong, Keon Jae Lee, Jun-Bo Yoon
Nanowire (NW) transfer technology has provided promising strategies to realize future flexible materials and electronics. Using this technology, geometrically controlled, high-quality NW arrays can now be obtained easily on various flexible substrates with high throughput. However, it is still challenging to extend this technology to a wide range of high-performance device applications because its limited temperature tolerance precludes the use of high-temperature annealing, which is essential for NW crystallization and functionalization...
February 2, 2017: ACS Nano
Hugo Barroux, Tengfei Jiang, Camille Paul, Florian Massuyeau, Romain Génois, Elijah Gordon, Myung-Hwan Whangbo, Stéphane Jobic, Romain Gautier
The physical properties of doped multifunctional compounds are commonly tuned by controlling the amount of dopants, but this control is limited since all the properties are influenced simultaneously by this single parameter. Herein, we present a strategy that enables one to fine-tune a specific combination of properties by controlling the reduction of dopants. The feasibility of this approach was demonstrated by optimizing the Near-IR photoluminescence of strontium titanate SrTiO3:Ni for potential applications in biomedicine for a range of absorbance in the Visible/Near-IR region...
January 26, 2017: Chemistry: a European Journal
Melchior Cini, Tracey D Bradshaw, Simon Woodward
When the first titanium complex with anticancer activity was identified in the 1970s, it was attractive, based on the presence of the dichloride unit in TiCl2Cp2 (Cp = η-C5H5)2, to assume its mode of biological action was closely aligned with cisplatin [cis-PtCl2(NH3)2]. Over the intervening 40 years however a far more complicated picture has arisen indicating multiple cellular mechanisms of cellular action can be triggered by titanium anti-cancer agents. This tutorial review aims to unpick the historical data and provide new researchers, without an explicit cancer biology background, a contemporary interpretation of both older and newer literature and to review the best techniques for attaining the identities of the biologically active titanium species and how these interact with the cancer cellular machinery...
February 20, 2017: Chemical Society Reviews
Guoling Yin, Yu Yang, Feilong Song, Christophe Renard, Zhi-Min Dang, Chang-Yong Shi, Dongrui Wang
Dielectric elastomer generators (DEGs), which follow the physics of variable capacitors and harvest electric energy from mechanical work, have attracted intensive attention over the past decade. The lack of ideal dielectric elastomers, after nearly two decades of research, has become the bottleneck for DEGs' practical applications. Here, we fabricated a series of polyurethane-based ternary composites and estimated their potential as DEGs to harvest electric energy for the first time. Thermoplastic polyurethane (PU) with high relative permittivity (∼8) was chosen as the elastic matrix...
February 6, 2017: ACS Applied Materials & Interfaces
Kazuhisa Sasaki, Kazuki Matsubara, Shiori Kawamura, Kenji Saito, Masayuki Yagi, Tatsuto Yui
Combinations of metal oxide semiconductors and gold nanoparticles (AuNPs) have been investigated as new types of materials. The in situ synthesis of AuNPs within the interlayer space of semiconducting layered titania nanosheet (TNS) films was investigated here. Two types of intermediate films (i.e., TNS films containing methyl viologen (TNS/MV(2+)) and 2-ammoniumethanethiol (TNS/2-AET(+))) were prepared. The two intermediate films were soaked in an aqueous tetrachloroauric(III) acid (HAuCl4) solution, whereby considerable amounts of Au(III) species were accommodated within the interlayer spaces of the TNS films...
January 17, 2017: Journal of Visualized Experiments: JoVE
Almonir Mansour, Thottam Kalkur
A switchable and tunable BAW duplexer for RF applications is presented in this paper. The fabricated BAW duplexer was built on sapphire substrate using solidly mounted resonators (SMR). A metalorganic solution deposition (MOSD) technique was used to form resonators with barium strontium titanate (BST) thin film and six layers of silicon dioxide and tantalum oxide as a Bragg reflector. By applying DC bias, the BST thin film shows an electrostrictive effect, and the two filter paths of the BAW duplexer switch to band pass response with center frequencies at 4...
October 4, 2016: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
Adrian Chee, Billy Yiu, Alfred Yu
Eigen-filters with attenuation response adapted to clutter statistics in color flow imaging (CFI) have shown improved flow detection sensitivity in the presence of tissue motion. Nevertheless, its practical adoption in clinical use is not straightforward due to the high computational cost for solving eigen-decompositions. Here, we provide a pedagogical description of how a real-time computing framework for eigen-based clutter filtering can be developed through a single-instruction, multiple data (SIMD) computing approach that can be implemented on a graphical processing unit (GPU)...
September 7, 2016: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
Thomas J Millar, Catherine Walsh, Thomas A Field
Until a decade ago, the only anion observed to play a prominent role in astrophysics was H(-). The bound-free transitions in H(-) dominate the visible opacity in stars with photospheric temperatures less than 7000 K, including the Sun. The H(-) anion is also believed to have been critical to the formation of molecular hydrogen in the very early evolution of the Universe. Once H2 formed, about 500 000 years after the Big Bang, the expanding gas was able to lose internal gravitational energy and collapse to form stellar objects and "protogalaxies", allowing the creation of heavier elements such as C, N, and O through nucleosynthesis...
January 23, 2017: Chemical Reviews
Nathanya J Platt, Karl M Kaye, Gregory J Limburn, Samuel D Cosham, Alexander N Kulak, Robert G Palgrave, Geoffrey Hyett
In this paper we report on the use of aerosol assisted chemical vapour deposition (AACVD) to form thin films of the zinc titanate phases using zinc acetate and titanium isopropoxide as precursors in methanol solution. Analysis by XRD and XPS found that through variation in experimental conditions we have been able to synthesize films of zinc titanate with composition of Zn2TiO4 or Zn0.3Ti2.7O4.94, which adopt the spinel and pseudobrookite structure respectively. In addition, we have also formed hybrid films of Zn2TiO4 with either ZnTiO3 or ZnO...
January 23, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
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