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Articles 1351 - 1380 of 1524
Full-Text Articles in Physical Sciences and Mathematics
Control Of Biodegradation Of A Mg Alloy In Simulated Body Fluid, Yafei Zhang, Maria Forsyth, Bruce Hinton, Gordon G. Wallace
Control Of Biodegradation Of A Mg Alloy In Simulated Body Fluid, Yafei Zhang, Maria Forsyth, Bruce Hinton, Gordon G. Wallace
Australian Institute for Innovative Materials - Papers
Mg alloy AZ31 is an attractive candidate for coronary artery stents, as it possesses excellent biocompatibility in human body and good mechanical properties. However, AZ31 magnesium alloys generally have poor corrosion resistance in the body environment. This paper reports on the early stages of an investigation into the corrosion mechanism and the morphology of corrosion of AZ31 in simulated body fluid (SBF), The investigation will also consider ways of improving corrosion resistance of this alloy in SBF through the use of ionic liquids. The results to date have shown that AZ31 suffers severe localized pitting corrosion in SBF. The pits …
In-Field Jc Improvement By Oxygen-Free Pyrene Gas Diffusion Into Highly Dense Mgb2 Superconductor, Minoru Maeda, Jung Ho Kim, Y Zhao, Yoon-Uk Heo, K Takase, Y Kubota, C Moriyoshi, F Yoshida, Y Kuroiwa, S X. Dou
In-Field Jc Improvement By Oxygen-Free Pyrene Gas Diffusion Into Highly Dense Mgb2 Superconductor, Minoru Maeda, Jung Ho Kim, Y Zhao, Yoon-Uk Heo, K Takase, Y Kubota, C Moriyoshi, F Yoshida, Y Kuroiwa, S X. Dou
Australian Institute for Innovative Materials - Papers
Oxygen-free pyrene gas as a carbon (C) dopant was delinked and incorporated into highly dense MgB2 structure via a gas phase diffusion method. The technique offers the advantages that molecular C is homogeneously distributed into MgB2 and substituted at the boron sites without any severe deterioration of grain connectivity. The C substitution causes a significant shrinkage of the a-lattice parameter and an increase in the lattice strain, resulting in high disorder. The introduction of structural disorder as a result of C doping leads to a considerable enhancement of the in-field critical current density (Jc) and upper critical …
A Highly Ordered Titania Nanotube Array As A Supercapacitor Electrode, Maryam Salari, Seyed Hamed Aboutalebi, Konstantin Konstantinov, Hua-Kun Liu
A Highly Ordered Titania Nanotube Array As A Supercapacitor Electrode, Maryam Salari, Seyed Hamed Aboutalebi, Konstantin Konstantinov, Hua-Kun Liu
Australian Institute for Innovative Materials - Papers
We report the synthesis of self-organized titania nanotubes and nanocrystalline titania powders employing an alternative and novel approach. Integrating these nanostructures in a binder-free working electrode improved the capacitance up to 911 uF cm-2, which is around one to two orders of magnitude higher than the conventional electric double layer capacitors.
Compact-Designed Supercapacitors Using Free-Standing Single-Walled Carbon Nanotube Films, Zhiqiang Niu, Weiya Zhou, Jun Chen, Guoxing Feng, Hong Li, Wenjun Ma, Jinzhu Li, Haibo Dong, Yan Ren, Duan Zhao, Sishen Xie
Compact-Designed Supercapacitors Using Free-Standing Single-Walled Carbon Nanotube Films, Zhiqiang Niu, Weiya Zhou, Jun Chen, Guoxing Feng, Hong Li, Wenjun Ma, Jinzhu Li, Haibo Dong, Yan Ren, Duan Zhao, Sishen Xie
Australian Institute for Innovative Materials - Papers
We reported the realization of assembling compact-designed supercapacitors using large-scaled freestanding and flexible single-walled carbon nanotube (SWCNT) films as both anode and cathode. A prototype of the processing procedures was developed to obtain the uniform spreading of the SWCNT films onto the separators serving as both electrodes and charge collectors without metallic current collectors, leading to a simplified and lightweight architecture. The area of SWCNT film on a separator can be scaled up and its thickness can be extended. High energy and power densities (43.7 Wh kg-1 and 197.3 kW kg-1, respectively) were achieved from the prepared …
Sinteractive Anodic Powders Improve Densification And Electrochemical Properties Of Bazr0.8y0.2o3-O Electrolyte Films For Anode-Supported Solid Oxide Fuel Cells, Lei Bi, Emiliana Fabbri, Ziqi Sun, Enrico Traversa
Sinteractive Anodic Powders Improve Densification And Electrochemical Properties Of Bazr0.8y0.2o3-O Electrolyte Films For Anode-Supported Solid Oxide Fuel Cells, Lei Bi, Emiliana Fabbri, Ziqi Sun, Enrico Traversa
Australian Institute for Innovative Materials - Papers
The difficult sintering of BaZr0.8Y0.2O3-δ(BZY20) powders makes the fabrication of anode-supported BZY20 electrolyte films complex. Dense BZY20 membranes were successfully fabricated on anode substrates made of sinteractive NiO-BZY20 powders, prepared by a combustion method. With respect to traditional anode substrates made of powders prepared by mechanical mixing, the anode substrates made of the wet-chemically synthesized composite NiO–BZY20 powders significantly promoted the densification of BZY20 membranes: dense BZY20 films were obtained after co-pressing and co-firing at 1300°C, a much lower temperature than those usually needed for densifying BZY20 membranes. Improved electrochemical performance was …
Bazr(0.8)Y(0.2)O(3-Delta)-Nio Composite Anodic Powders For Proton-Conducting Sofcs Prepared By A Combustion Method, Lei Bi, Emiliana Fabbri, Ziqi Sun, Enrico Traversa
Bazr(0.8)Y(0.2)O(3-Delta)-Nio Composite Anodic Powders For Proton-Conducting Sofcs Prepared By A Combustion Method, Lei Bi, Emiliana Fabbri, Ziqi Sun, Enrico Traversa
Australian Institute for Innovative Materials - Papers
BaZr0.8Y0.2O3-∂ (BZY)-NiO composite powders with different BZY-NiO weight ratios were prepared by a combustion method as anodes for proton-conducting solid oxide fuel cells (SOFCs). After heating to 1100°C for 6 h, the composite powders were made of a well-dispersed mixture of two phases, BZY and NiO. Chemical stability tests showed that the BZY-NiO anodic powders had good stability against CO2, whereas comparative tests under the same conditions showed degradation for BaCe0.7Zr0.1Y0.2O3-∂- NiO, which is at present the most used anode material for proton-conducting …
Position Preference And Diffusion Path Of An Oxygen Ion In Apatite-Type Lanthanum Silicate La9.33si6o26: A Density Functional Study, Ting Liao, Taizo Sasaki, Shigeru Suehara, Ziqi Sun
Position Preference And Diffusion Path Of An Oxygen Ion In Apatite-Type Lanthanum Silicate La9.33si6o26: A Density Functional Study, Ting Liao, Taizo Sasaki, Shigeru Suehara, Ziqi Sun
Australian Institute for Innovative Materials - Papers
Using density functional theory, we investigated the position preference and diffusion mechanisms of interstitial oxygen ions in lanthanum silicate La9.33Si6O26, which is an apatite-structured oxide and a promising candidate electrolyte material for solid oxide fuel cells. The reported lanthanum vacancies were explicitly taken into account by theoretically determining their arrangement with a supercell model. The most stable structures and the formation energies of oxygen interstitials were determined for each charged state. It was found that the double-negatively charged state is stable over a wide range of the Fermi level, and that the excess oxygen …
Oxidative Acetylenic Coupling Reactions As A Surface Chemistry Tool, Simone Ciampi, Michael James, Nadim A. Darwish, Erwann Luais, Bin Guan, Jason Brian Harper, J Justin Gooding
Oxidative Acetylenic Coupling Reactions As A Surface Chemistry Tool, Simone Ciampi, Michael James, Nadim A. Darwish, Erwann Luais, Bin Guan, Jason Brian Harper, J Justin Gooding
Australian Institute for Innovative Materials - Papers
A novel method to prepare redox monolayers on silicon electrodes has been developed that employs CuI-catalyzed oxidative acetylenic coupling reactions for molecular electronic type applications. As the first case study, ethynylferrocene was covalently immobilized onto an acetylene-terminated monolayer on a Si(100) surface to give a 1,3-diyne (CC-CC-) linked redox assembly. The derivatization process requires no protection/de-protection steps, nor activation procedures. The effect of the conjugated diyne linkage on the rate of electron transfer between tethered ferrocenyl units and the silicon electrode is benchmarked against well-established "click" products (i.e. 1,2,3-triazole linkage). The surfaces, after each step, are characterized thoroughly using X-ray …
Nanoscale Condensation Of Water On Self-Assembled Monolayers, Michael James, Tamim A. Darwish, Simone Ciampi, Sven O. Sylvester, Zhaoming Zhang, Albert Ng, J Justin Gooding, Tracey L. Hanley
Nanoscale Condensation Of Water On Self-Assembled Monolayers, Michael James, Tamim A. Darwish, Simone Ciampi, Sven O. Sylvester, Zhaoming Zhang, Albert Ng, J Justin Gooding, Tracey L. Hanley
Australian Institute for Innovative Materials - Papers
We demonstrate that water is almost universally present on apparently dry self-assembled monolayers, even on those considered almost hydrophobic by conventional methods such as water contact goniometry. The structure and kinetics of nanoscale water adsorption onto these surfaces were investigated using X-ray and neutron reflectometry, as well as atomic force microscopy. Condensation of water on hydrophilic surfaces under ambient conditions formed a dense sub-nanometre surface layer; the thickness of which increased with exponentially limiting kinetics. Tapping mode AFM measurements show the presence of nanosized droplets that covered a small percentage (∼2%) of the total surface area, and which became fewer …
Mesoporous Silicon Photonic Crystal Microparticles: Towards Single-Cell Optical Biosensors, Bin Guan, Astrid I. Magenau, Krisopher A. Kilian, Simone Ciampi, Katharina Gaus, Peter J. Reece, J Justin Gooding
Mesoporous Silicon Photonic Crystal Microparticles: Towards Single-Cell Optical Biosensors, Bin Guan, Astrid I. Magenau, Krisopher A. Kilian, Simone Ciampi, Katharina Gaus, Peter J. Reece, J Justin Gooding
Australian Institute for Innovative Materials - Papers
In this paper we demonstrate the possibility of modifying porous silicon (PSi) particles with surface chemistry and recognition molecules (antibodies) such that these devices could potentially be used for single-cell identification or sensing. This is achieved by modifying PSi Rugate filters via hydrosilylation with surface chemistry that serves firstly, to protect the silicon surfaces from oxidation; secondly, renders the surfaces resistant to nonspecific adsorption of proteins and cells and thirdly, allows further functionality to be added such as the coupling of antibodies. The surface chemistry remained unchanged after sonication of the PSi to form PSi microparticles. The ability to monitor …
Critical Property In Relaxor-Pbtio3 Single Crystals - Shear Piezoelectric Response, Fei Li, Shujun Zhang, Zhuo Xu, Xiaoyong Wei, Thomas R. Shrout
Critical Property In Relaxor-Pbtio3 Single Crystals - Shear Piezoelectric Response, Fei Li, Shujun Zhang, Zhuo Xu, Xiaoyong Wei, Thomas R. Shrout
Australian Institute for Innovative Materials - Papers
The shear piezoelectric behavior in relaxor-PbTiO 3 (PT) single crystals is investigated with regard to the crystal phase. High levels of shear piezoelectric activity, d 15 or d 24 >2000 pC N -1, are observed for single-domain rhombohedral (R), orthorhombic (O), and tetragonal (T) relaxor-PT crystals. The high piezoelectric response is attributed to a flattening of the Gibbs free energy at compositions close to the morphotropic phase boundaries, where polarization rotation is easily accomplished by applying a perpendicular electric field. The shear piezoelectric behavior of perovskite ferroelectric crystals is discussed with respect to ferroelectric-ferroelectric phase transitions and the dc bias …
Ammonium Octahydrotriborate (Nh4b3h8): New Synthesis, Structure, And Hydrolytic Hydrogen Release, Zhenguo Huang, Xuenian Chen, Teshome Yisgedu, Edward A. Meyers, Sheldon Shore, J C. Zhao
Ammonium Octahydrotriborate (Nh4b3h8): New Synthesis, Structure, And Hydrolytic Hydrogen Release, Zhenguo Huang, Xuenian Chen, Teshome Yisgedu, Edward A. Meyers, Sheldon Shore, J C. Zhao
Australian Institute for Innovative Materials - Papers
A metathesis reaction between unsolvated NaB3H8 and NH4Cl provides a simple and high-yield synthesis of NH4B3H8. Structure determination through X-ray single crystal diffraction analysis reveals weak N—Hδ+- - -Hδ-—B interaction in NH4B3H8 and strong N—Hδ+—Hδ-—B interaction in NH4B3H8·18-crown-6·THF adduct. Pyrolysis of NH4B3H8 leads to the formation of hydrogen gas with appreciable amounts of other volatile boranes below 160°C. Hydrolysis experiments show that …
Dye-Sensitized Cualo2 Photocathodes For Tandem Solar Cell Applications, Andrew Nattestad, Xiaoli Zhang, Udo Bach, Yi-Bing Cheng
Dye-Sensitized Cualo2 Photocathodes For Tandem Solar Cell Applications, Andrew Nattestad, Xiaoli Zhang, Udo Bach, Yi-Bing Cheng
Australian Institute for Innovative Materials - Papers
Dye-sensitized solar cells (DSCs) using the p-type semiconductor CuAlO2, in conjunction with a highly effective hole injecting dye and an iodide-triiodide-based electrolyte have been produced, demonstrating photocathodic behavior. An improved open-circuit voltage (VOC) of 333 mV was observed, compared to analogous devices using NiO, which can be explained by the CuAlO2 valence-band energy, which is lower on the vacuum scale than that of NiO. Incident photon-to-charge-carrier efficiency response confirms that the observed photocurrent is generated by the dye.
Dithienothiophene (Dtt)-Based Dyes For Dye-Sensitized Solar Cells: Synthesis Of 2,6-Dibromo-Dtt, Tae-Hyuk Kwon, Vanessa Armel, Andrew Nattestad, Douglas R. Macfarlane, Udo Bach, Samuel J. Lind, Keith C. Gordon, Weihua Tang, David J. Jones, Andrew Holmes
Dithienothiophene (Dtt)-Based Dyes For Dye-Sensitized Solar Cells: Synthesis Of 2,6-Dibromo-Dtt, Tae-Hyuk Kwon, Vanessa Armel, Andrew Nattestad, Douglas R. Macfarlane, Udo Bach, Samuel J. Lind, Keith C. Gordon, Weihua Tang, David J. Jones, Andrew Holmes
Australian Institute for Innovative Materials - Papers
A one-pot synthesis of 2,6-dibromodithieno[3,2-b;2′,3′-d]thiophene (dibromo-DTT, 4) was developed. A key step was bromodecarboxylation of DTT-2,6-dicarboxylic acid, obtained by saponification of the diester 1. The donor-acceptor dye DAHTDTT (13), based on a central 2,6-bis[2′-(3′-hexylthienyl)]dithieno[3,2-b;2′,3′-d]thiophene core (9), was prepared and incorporated in a dye-sensitized solar cell (DSC), which exhibited an energy conversion efficiency of 7.3% with Voc of 697 mV, Jsc of 14.4 mA/cm2, and ff of 0.73 at 1 sun.
Block-Copolymer-Assisted Synthesis Of Hydroxyapatite Nanoparticles With High Surface Area And Uniform Size, Yu Huang, Masataka Imura, Yoshihiro Nemoto, Chao Hung Cheng, Yusuke Yamauchi
Block-Copolymer-Assisted Synthesis Of Hydroxyapatite Nanoparticles With High Surface Area And Uniform Size, Yu Huang, Masataka Imura, Yoshihiro Nemoto, Chao Hung Cheng, Yusuke Yamauchi
Australian Institute for Innovative Materials - Papers
We report the synthesis of hydroxyapatite nanoparticles (HANPs) by the coprecipitation method using calcium D-gluconate and potassium hydrogen phosphate as the sources of calcium and phosphate ions, respectively, and the triblock copolymer F127 as a stabilizer. The HANPs were characterized using scanning electron microscopy, x-ray diffraction, and nitrogen adsorption/desorption isotherms. Removal of F127 by solvent extraction or calcination alters the structure of HANPs. The solvent-extracted HANPs were single crystals with their 〈001〉 axis oriented along the rod axis of the HANP, whereas the calcined HANPs contained two crystal phases that resulted in a spherical morphology. The calcined HANPs had much …
5-Chloro-1-Phenyl-1h-Pyrazol-4-Amine, A Korzanski, Pawel W. Wagner, Maciej Kubicki
5-Chloro-1-Phenyl-1h-Pyrazol-4-Amine, A Korzanski, Pawel W. Wagner, Maciej Kubicki
Australian Institute for Innovative Materials - Papers
No abstract provided.
Fabrication, Magnetic, And Ferroelectric Properties Of Multiferroic Bifeo3 Hollow Nanoparticles, Yi Du, Z. Cheng, S X. Dou, Darren J. Attard, Xiaolin Wang
Fabrication, Magnetic, And Ferroelectric Properties Of Multiferroic Bifeo3 Hollow Nanoparticles, Yi Du, Z. Cheng, S X. Dou, Darren J. Attard, Xiaolin Wang
Australian Institute for Innovative Materials - Papers
Hollow BiFeO3nanoparticles were synthesized by an electrospray route for the first time. The phase purity and structure have been investigated by x-ray diffraction and Raman spectroscopy. Transmission and scanning electron microscope investigations revealed that the as-obtained BiFeO3 hollow spheres were polycrystalline, with a shell thickness of 35 nm. The formation mechanism can be possibly explained by Ostwald ripening. Raman spectra have verified decreased vibrational frequencies in BiFeO3nanoparticles. These hollow and core-shell multiferroicnanoparticles exhibit significantly enhanced ferromagnetism from 5 to 600 K due to a broken spiral spin structure. The ferroelectricity of hollow BiFeO3 particles …
Domain Wall Conductivity In Oxygen Deficient Multiferroic Ymno3 Single Crystals, Yi Du, Xiaolin Wang, Dapeng Chen, S X. Dou, Z. Cheng, Michael J. Higgins, Gordon G. Wallace, Jiazhao Wang
Domain Wall Conductivity In Oxygen Deficient Multiferroic Ymno3 Single Crystals, Yi Du, Xiaolin Wang, Dapeng Chen, S X. Dou, Z. Cheng, Michael J. Higgins, Gordon G. Wallace, Jiazhao Wang
Australian Institute for Innovative Materials - Papers
The transport properties of domain walls in oxygen deficient multiferroic YMnO3 single crystals have been probed using conductive atomic force microscopy and piezoresponse force microscopy. Domain walls exhibit significantly enhanced conductance after being poled in electric fields, possibly induced by oxygen vacancy ordering at domain walls. The electronic conduction can be understood by the Schottky emission and Fowler-Nordheim tunnelling mechanisms. Our results show that the domain wall conductance can be modulated through band structure engineering by manipulating ordered oxygen vacancies in the poling fields.
Wet Chemical Routes To The Assembly Of Organic Monolayers On Silicon Surfaces Via The Formation Of Si-C Bonds: Surface Preparation, Passivation And Functionalization, Simone Ciampi, Jason Brian Harper, J Justin Gooding
Wet Chemical Routes To The Assembly Of Organic Monolayers On Silicon Surfaces Via The Formation Of Si-C Bonds: Surface Preparation, Passivation And Functionalization, Simone Ciampi, Jason Brian Harper, J Justin Gooding
Australian Institute for Innovative Materials - Papers
Organic functionalization of non-oxidized silicon surfaces, while allowing for robust chemical passivation of the inorganic substrate, is intended and expected to broaden the chemical, physical and electronic properties of the currently most relevant technological material. Numerous protocols are now available for the preparation of Si-C, Si-O and Si-N bound layers. In particular, the covalent attachment of 1-alkenes and 1-alkynes onto hydride-terminated Si(100) and Si(111) has seen a wealth of research activity starting from the pioneering work of Linford and Chidsey (Alkyl monolayers covalently bonded to silicon surfaces, J. Am. Chem. Soc., 1993, 115(26), 12631-12632). This critical review aims to bring …
Li2b12h12·7nh3: A New Ammine Complex For Ammonia Storage Or Indirect Hydrogen Storage, Zhenguo Huang, Judith C. Gallucci, Xuenian Chen, Teshome B. Yisgedu, Hima Kumar Lingam, Sheldon G. Shore, Ji-Cheng Zhao
Li2b12h12·7nh3: A New Ammine Complex For Ammonia Storage Or Indirect Hydrogen Storage, Zhenguo Huang, Judith C. Gallucci, Xuenian Chen, Teshome B. Yisgedu, Hima Kumar Lingam, Sheldon G. Shore, Ji-Cheng Zhao
Australian Institute for Innovative Materials - Papers
A new ammine complex, Li2B12H12$7NH3, that can reversibly release all the NH3 at below 200oC and reabsorb NH3 at room temperature and 0.5 bar was synthesized and investigated for reversible ammonia storage or indirect hydrogen storage.
InterMolecular DiHydrogen- And Hydrogen-Bonding InterActions In DiAmmonium Closo-DecaHydroDecaBorate Sesquihydrate, Teshome B. Yisgedu, Xuenian Chen, Hima Kumar Lingam, Zhenguo Huang, Edward A. Meyers, Sheldon G. Shore, Ji-Cheng Zhao
InterMolecular DiHydrogen- And Hydrogen-Bonding InterActions In DiAmmonium Closo-DecaHydroDecaBorate Sesquihydrate, Teshome B. Yisgedu, Xuenian Chen, Hima Kumar Lingam, Zhenguo Huang, Edward A. Meyers, Sheldon G. Shore, Ji-Cheng Zhao
Australian Institute for Innovative Materials - Papers
The asymmetric unit of the title salt, 2NH4+_B10H102__1.5H2O or (NH4)2B10H10_1.5H2O, (I), contains two B10H102_ anions, four NH4+ cations and three water molecules. (I) was converted to the anhydrous compound (NH4)2B10H10, (II), by heating to 343 K and its X-ray powder pattern was obtained. The extended structure of (I) shows two types of hydrogen-bonding interactions (N-H_ _ _O and O-H_ _ _O) and two types of dihydrogen-bonding interactions (N- H_ _ _H-B and O-H_ _ _H-B). The N-H_ _ _H-B dihydrogen bonding forms a two-dimensional sheet structure, and hydrogen bonding (N-H_ _ _O and O-H_ _ _O) and O- H_ _ …
Strong Competition Between The Delta L And Delta T-C Flux Pinning Mechanisms In Mgb2 Doped With Carbon Containing Compounds, Shaban R. Ghorbani, Xiaolin Wang, Md S. Hossain, Qiwen Yao, S X. Dou, Sung-Ik Lee, K C. Chung, Y K. Kim
Strong Competition Between The Delta L And Delta T-C Flux Pinning Mechanisms In Mgb2 Doped With Carbon Containing Compounds, Shaban R. Ghorbani, Xiaolin Wang, Md S. Hossain, Qiwen Yao, S X. Dou, Sung-Ik Lee, K C. Chung, Y K. Kim
Australian Institute for Innovative Materials - Papers
The transport and magnetic properties of 10 wt % malic acid and 5 wt % nanocarbon doped MgB2 have been studied by measuring the resistivity (p), critical current density (jc), connectivity factor (AF), irreversibility field (Hirr), and upper critical field (Hc2). The pinning mechanisms are studied in terms of the collective pinning model. It was found that both mean free path (δl) and critical temperature (δTc) pinning mechanisms coexist in both doped MgB2. For both the malic acid and nanocarbon …
Enhancement Of The In-Field Jc Of Mgb2 Via Sicl4 Doping, Xiaolin Wang, S X. Dou, Md S. Hossain, Zhenxiang Cheng, X.Z Liao, Shaban R. Ghorbani, Qiwen Yao, Jung Ho Kim, Tania M. Silver
Enhancement Of The In-Field Jc Of Mgb2 Via Sicl4 Doping, Xiaolin Wang, S X. Dou, Md S. Hossain, Zhenxiang Cheng, X.Z Liao, Shaban R. Ghorbani, Qiwen Yao, Jung Ho Kim, Tania M. Silver
Australian Institute for Innovative Materials - Papers
We present the following results. (1) We introduce a doping source for MgB2, liquid SiCl4, which is free of C, to significantly enhance the irreversibility field (Hirr), the upper critical field (Hc2), and the critical current density (Jc) with a little reduction in the critical temperature (Tc). (2) Although Si can not be incorporated into the crystal lattice, a significant reduction in the a-axis lattice parameter was found, to the same extent as for carbon doping. (3) Based on the first-principles calculation, it is found that it …
Magnetic Properties Of Ho2fe17-Xmnx - Influence Of Mn Substitution, Jianli Wang, Stewart J. Campbell, A J Studer, S J. Kennedy, Rong Zeng
Magnetic Properties Of Ho2fe17-Xmnx - Influence Of Mn Substitution, Jianli Wang, Stewart J. Campbell, A J Studer, S J. Kennedy, Rong Zeng
Australian Institute for Innovative Materials - Papers
The structural and magnetic properties of Ho2Fe17−xMnx (x=0-5) have been investigated by x-ray diffraction, Mössbauer spectroscopy and DC magnetization measurements (0-5 T) over the temperature range 4.5-350 K. Similar to other ferrimagnetic R2Fe17-xMnx systems, the unit cell volume generally increases with Mn content other than for low Mn values where a slight maximum is detected around x ∼ 0.5. The nature of the magnetic phase transitions around TC is shown by Arrot plot analysis to be second order for all samples. The Curie temperature remains essentially unchanged …
Magnetic Properties Of La Doped Bi2femno6 Ceramic And Film, Hongyang Zhao, Hideo Kimura, Zhenxiang Cheng, Xiaolin Wang, Kiyoshi Ozawa, Takashi Nishida
Magnetic Properties Of La Doped Bi2femno6 Ceramic And Film, Hongyang Zhao, Hideo Kimura, Zhenxiang Cheng, Xiaolin Wang, Kiyoshi Ozawa, Takashi Nishida
Australian Institute for Innovative Materials - Papers
We present a comprehensive study of the magnetic properties for La doped Bi2FeMnO6 (LBFM) ceramic and film which was first deposited on (100) SrTiO3 substrate by pulsed laser deposition method. The LBFM film is antiferromagnetic or weak ferrimagnetic at room temperature and it shows clear magnetic anisotropy. But it is not sure whether the spin-glass behavior is present in LBFM film because of the influence from substrate. Compared to the film, LBFM ceramic shows different magnetic properties. It has a lower TN and all the observations indicate that LBFM ceramic shows spin-glass behavior.
Lead-Free Potassium Bismuth Titanate Thin Film With Complex Aurivillius Layer Structure, Zhenxiang Cheng, Xiaolin Wang, Hongyang Zhao, Hideo Kimura
Lead-Free Potassium Bismuth Titanate Thin Film With Complex Aurivillius Layer Structure, Zhenxiang Cheng, Xiaolin Wang, Hongyang Zhao, Hideo Kimura
Australian Institute for Innovative Materials - Papers
A ferroelectric thin film of Aurivillius phase K0.5Bi4.5Ti4O15 (KBT) with a complex bismuth layer-structure was fabricated using the pulsed laser deposition method. The thin film grown on Pt/Ti/SiO2/ Si substrate shows a strong c-axis orientation, as revealed by x-ray diffraction results, and platelike growth of grains. A Pt/KBT/Pt capacitor shows a maximum polarization of about 20 µC/cm2. In addition, the capacitor also shows good fatigue resistance, with a decrease of 14.5% in the remanent polarization after 107 switching cycles. This Aurivillius phase with four layers of TiO6 …
Intergrain Connectivity Of Mgb2 Ceramics Studied By Impedance Analysis, C.C Wang, C Wang, Rong Zeng, S X. Dou
Intergrain Connectivity Of Mgb2 Ceramics Studied By Impedance Analysis, C.C Wang, C Wang, Rong Zeng, S X. Dou
Australian Institute for Innovative Materials - Papers
First, by using of the conventional Rowell analysis, we demonstrated that the addition of nano BN particles can effectively eliminate MgO and pores in MgB2 resulting in a very high density and good connectivity of BN-doped MgB2. Then, another method—low-frequency dielectric impedance analysis—was introduced to characterize the properties of the grain boundaries of MgB2. A comparative impedance study was performed in the frequency range from 100 Hz to 100 MHz on pure and nano BN-doped MgB2. The study revealed some following interesting results: (1) a dielectric resonance around frequency of 108 in both samples …
Superconductivity In Smfe1-Xcoxaso (X=0.0-0.30), V P. Awana, Anand Pal, Arpita Vajpayee, R S. Meena, H Kishan, Mushahid Husain, Rong Zeng, S Yu, K Yamaura, E Takayammuromachi
Superconductivity In Smfe1-Xcoxaso (X=0.0-0.30), V P. Awana, Anand Pal, Arpita Vajpayee, R S. Meena, H Kishan, Mushahid Husain, Rong Zeng, S Yu, K Yamaura, E Takayammuromachi
Australian Institute for Innovative Materials - Papers
We report synthesis, structural details, and magnetization of SmFe1-xCoxAsO with x ranging from 0.0 to 0.30. It is found that Co substitutes fully at Fe site in SmFeAsO in an isostructural lattice with slightly compressed cell. The parent compound exhibited known as the spin density wave (SDW) character is below at around 140 K. Successive doping of Co at Fe site suppressed the SDW transition for x=0.05 and later induced superconductivity for x=0.10, 0.15, and 0.20, respectively, at 14, 15.5, and 9 K. The lower critical field as seen from magnetization measurements is below 200 Oe. …
Magnetic Properties Of Bi2femno6: A Multiferroic Material With Double-Perovskite Structure, Yi Du, Zhenxiang Cheng, S X. Dou, Xiaolin Wang, Hua Zhao, Hideo Kimura
Magnetic Properties Of Bi2femno6: A Multiferroic Material With Double-Perovskite Structure, Yi Du, Zhenxiang Cheng, S X. Dou, Xiaolin Wang, Hua Zhao, Hideo Kimura
Australian Institute for Innovative Materials - Papers
Single phase Bi2FeMnO6 was synthesized on Si substrates by an electrospray method. Three peaks were observed in the temperature dependence of magnetization curve, which is attributed to the inhomogeneous distribution of Fe3+ and Mn3+. The observed magnetic peaks at 150 K, 260 K, and 440 K correspond to orderings of the ferrimagnetic Fe–O–Mn, and antiferromagnetic Mn–O–Mn and Fe–O–Fe, respectively. Heat capacity measurements were carried out to confirm these magnetic transitions. The Debye temperature of Bi2FeMnO6 is 339 K, calculated from Debye–Einstein fitting.
Pluripotent Human Stem Cells, Blaine W. Phillips, Jeremy M. Crook
Pluripotent Human Stem Cells, Blaine W. Phillips, Jeremy M. Crook
Australian Institute for Innovative Materials - Papers
The need for new and improved pharmacotherapies in medicine, high late-stage compound attrition in drug discovery, and upcoming patent expirations is driving interest by the pharmaceutical industry in pluripotent stem cells for in vitro modeling and early-stage testing of toxicity and target engagement. In particular, human embryonic and induced pluripotent stem cells represent potentially cost-effective and accessible sources of organ-specific cells that foretell in vivo human tissue response to new chemical entities. Here we consider the potential of these cells as novel tools for drug development, including toxicity screening and metabolic profiling. We hold that despite various challenges to translating …