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Articles 151 - 169 of 169
Full-Text Articles in Engineering
Electrically Contractile Polymers Augment Right Ventricular Output In The Heart, Arjang Ruhparwar, Patricia Piontek, Matthias Ungerer, Ali Ghodsizad, Sasan Partovi, Javad Foroughi, Gabor Szabo, Mina Farag, Matthias Karck, Geoffrey M. Spinks, Seon Jeong Kim
Electrically Contractile Polymers Augment Right Ventricular Output In The Heart, Arjang Ruhparwar, Patricia Piontek, Matthias Ungerer, Ali Ghodsizad, Sasan Partovi, Javad Foroughi, Gabor Szabo, Mina Farag, Matthias Karck, Geoffrey M. Spinks, Seon Jeong Kim
Australian Institute for Innovative Materials - Papers
Research into the development of artificial heart muscle has been limited to assembly of stem cell-derived cardiomyocytes seeded around a matrix, while nonbiological approaches to tissue engineering have rarely been explored. The aim of the study was to apply electrically contractile polymer-based actuators as cardiomyoplasty for positive inotropic support of the right ventricle. Complex trilayer polypyrrole (PPy) bending polymers for high-speed applications were generated. Bending motion occurred directly as a result of electrochemically driven charging and discharging of the PPy layers. In a rat model (n=5), strips of polymers (3x20mm) were attached and wrapped around the right ventricle …
Novel Germanium/Polypyrrole Composite For High Power Lithium-Ion Batteries, Xuanwen Gao, Wenbin Luo, Chao Zhong, David Wexler, Shulei Chou, Hua-Kun Liu, Zhicong Shi, Guohua Chen, Kiyoshi Ozawa, Jiazhao Wang
Novel Germanium/Polypyrrole Composite For High Power Lithium-Ion Batteries, Xuanwen Gao, Wenbin Luo, Chao Zhong, David Wexler, Shulei Chou, Hua-Kun Liu, Zhicong Shi, Guohua Chen, Kiyoshi Ozawa, Jiazhao Wang
Australian Institute for Innovative Materials - Papers
Nano-Germanium/polypyrrole composite has been synthesized by chemical reduction method in aqueous solution. The Ge nanoparticles were directly coated on the surface of the polypyrrole. The morphology and structural properties of samples were determined by X-ray diffraction, scanning electron microscopy and transmission electron microscopy. Thermogravimetric analysis was carried out to determine the polypyrrole content. The electrochemical properties of the samples have been investigated and their suitability as anode materials for the lithium-ion battery was examined. The discharge capacity of the Ge nanoparticles calculated in the Ge-polypyrrole composite is 1014 mAh g-1 after 50 cycles at 0.2 C rate, which is …
Non-Wettable, Oxidation-Stable, Brightly Luminescent, Perfluorodecyl-Capped Silicon Nanocrystal Film, Chenxi Qian, Wei Sun, Liwei Wang, Chanlong Chen, Kristine Liao, Wendong Wang, Jia Jia, Benjamin D. Hatton, Gilberto Casillas, Marty Kurylowicz, Christopher M. Yip, Melanie L. Mastronardi, Geoffrey A. Ozin
Non-Wettable, Oxidation-Stable, Brightly Luminescent, Perfluorodecyl-Capped Silicon Nanocrystal Film, Chenxi Qian, Wei Sun, Liwei Wang, Chanlong Chen, Kristine Liao, Wendong Wang, Jia Jia, Benjamin D. Hatton, Gilberto Casillas, Marty Kurylowicz, Christopher M. Yip, Melanie L. Mastronardi, Geoffrey A. Ozin
Australian Institute for Innovative Materials - Papers
Here we describe for the first time the synthesis of colloidally stable, brightly luminescent perfluorodecyl-capped silicon nanocrystals and compare the properties of solutions and films made from them with those of their perhydrodecyl-capped relatives. The perfluorodecyl capping group compared to the perhydrodecyl capping group yields superior hydrophobicity and much greater resistance to air oxidation, the enhanced electron-withdrawing character induces blue shifts in the wavelength of photoluminescence, and the lower-frequency carbon-fluorine stretching modes disfavor non-radiative relaxation pathways and boost the absolute photoluminescence quantum yield. Together these attributes bode well for advanced materials and biomedical applications founded upon perfluorodecyl-protected silicon nanocrystals.
Na3v2(Po4)3 Particles Partly Embedded In Carbon Nanofibers With Superb Kinetics For Ultra-High Power Sodium Ion Batteries, Junghoon Yang, Dongwook Han, Mi Ru Jo, Kyeongse Song, Yongil Kim, Shulei Chou, Hua-Kun Liu, Yong-Mook Kang
Na3v2(Po4)3 Particles Partly Embedded In Carbon Nanofibers With Superb Kinetics For Ultra-High Power Sodium Ion Batteries, Junghoon Yang, Dongwook Han, Mi Ru Jo, Kyeongse Song, Yongil Kim, Shulei Chou, Hua-Kun Liu, Yong-Mook Kang
Australian Institute for Innovative Materials - Papers
We here describe the extraordinary performance of NASICON Na3V2(PO4)3-carbon nanofiber (NVP-CNF) composites with ultra-high power and excellent cycling performance. NVP-CNFs are composed of CNFs at the center part and partly embedded NVP nanoparticles in the shell. We first report this unique morphology of NVP-CNFs for the electrode material of secondary batteries as well as for general energy conversion materials. Our NVP-CNFs show not only a high discharge capacity of approx. 88.9 mA h g-1 even at a high current density of 50 C but also approx. 93% cyclic retention property after …
Single Crystalline Co3o4 Nanocrystals Exposed With Different Crystal Planes For Li-O2 Batteries, Dawei Su, S X. Dou, Guoxiu Wang
Single Crystalline Co3o4 Nanocrystals Exposed With Different Crystal Planes For Li-O2 Batteries, Dawei Su, S X. Dou, Guoxiu Wang
Australian Institute for Innovative Materials - Papers
Single crystalline Co3O4 nanocrystals exposed with different crystal planes were synthesised, including cubic Co3O4 nanocrystals enclosed by {100} crystal planes, pseudo octahedral Co3O4 enclosed by {100} and {110} crystal planes, Co3O4 nanosheets exposed by {110} crystal planes, hexagonal Co3O4 nanoplatelets exposed with {111} crystal planes, and Co3O4 nanolaminar exposed with {112} crystal planes. Well single crystalline features of these Co3O4 nanocrystals were confirmed by FESEM and HRTEM analyses. The electrochemical performance for Li-O2 batteries shows that Co3 …
Three-Dimensional Printing Fiber Reinforced Hydrogel Composites, Shannon Bakarich, Robert Gorkin Iii, Marc In Het Panhuis, Geoffrey M. Spinks
Three-Dimensional Printing Fiber Reinforced Hydrogel Composites, Shannon Bakarich, Robert Gorkin Iii, Marc In Het Panhuis, Geoffrey M. Spinks
Australian Institute for Innovative Materials - Papers
An additive manufacturing process that combines digital modeling and 3D printing was used to prepare fiber reinforced hydrogels in a single-step process. The composite materials were fabricated by selectively pattering a combination of alginate/acrylamide gel precursor solution and an epoxy based UV-curable adhesive (Emax 904 Gel-SC) with an extrusion printer. UV irradiation was used to cure the two inks into a single composite material. Spatial control of fiber distribution within the digital models allowed for the fabrication of a series of materials with a spectrum of swelling behavior and mechanical properties with physical characteristics ranging from soft and wet to …
Integrating A Triplet-Triplet Annihilation Up-Conversion System To Enhance Dye-Sensitized Solar Cell Response To Sub-Bandgap Light, Andrew Nattestad, Yuen Yap Cheng, R Macqueen, Gordon G. Wallace, Timothy Schmidt
Integrating A Triplet-Triplet Annihilation Up-Conversion System To Enhance Dye-Sensitized Solar Cell Response To Sub-Bandgap Light, Andrew Nattestad, Yuen Yap Cheng, R Macqueen, Gordon G. Wallace, Timothy Schmidt
Australian Institute for Innovative Materials - Papers
The poor response of dye-sensitized solar cells (DSCs) to red and infrared light is a significant impediment to the realization of higher photocurrents and hence higher efficiencies. Photon up-conversion by way of triplet-triplet annihilation (TTA-UC) is an attractive technique for using these otherwise wasted low energy photons to produce photocurrent, while not interfering with the photoanodic performance in a deleterious manner. Further to this, TTA-UC has a number of features, distinct from other reported photon up-conversion technologies, which renders it particularly suitable for coupling with DSC technology. In this work, a proven high performance TTA-UC system, comprising a palladium porphyrin …
Recent Progress On Synthesis, Multi-Scale Structure, And Properties Of Y-Si-O Oxides, Ziqi Sun, M S. Li, Y C. Zhou
Recent Progress On Synthesis, Multi-Scale Structure, And Properties Of Y-Si-O Oxides, Ziqi Sun, M S. Li, Y C. Zhou
Australian Institute for Innovative Materials - Papers
Yttrium silicates (Y-Si-O oxides), including Y2Si2O7, Y2SiO5, and Y4·67(SiO4)3O apatite, have attracted wide attentions from material scientists and engineers, because of their extensive polymorphisms and important roles as grain boundary phases in improving the high-temperature mechanical/thermal properties of Si3N4 and SiC ceramics. Recent interest in these materials has been renewed by their potential applications as high-temperature structural ceramics, oxidation protective coatings, and environmental barrier coatings (EBCs). The salient properties of Y-Si-O oxides are strongly related to their unique chemical bonds and …
Impacts Of Crystal Orientation Of Gaas On The Interfacial Structures And Electrical Properties Of Hf0.6la0.4ox Films, Tingting Jia, Hideo Kimura, Hongyang Zhao, Qiwen Yao, Zhenxiang Cheng, Xinghong Cheng, Yuehui Yu
Impacts Of Crystal Orientation Of Gaas On The Interfacial Structures And Electrical Properties Of Hf0.6la0.4ox Films, Tingting Jia, Hideo Kimura, Hongyang Zhao, Qiwen Yao, Zhenxiang Cheng, Xinghong Cheng, Yuehui Yu
Australian Institute for Innovative Materials - Papers
One of the major challenges in realizing the GaAs channel in the metal oxide semiconductor field effect transistor is the degrading in electron transport properties at the interface between GaAs and the gate oxide. In this study, Hf0.6La0.4Ox gate oxide films were deposited at a low temperature (200 °C) on GaAs(111)A and GaAs(100) substrates by plasma enhanced atomic layer deposition. Microstructure analysis indicates that residuals of gallium oxide, arsenic oxide, and As element remained at the interface of Hf0.6La0.4Ox/GaAs(100). On contrast, a smoother interface is observed between Hf0.6 …
Conductivity And Oxygen Reduction Activity Changes In Lanthanum Strontium Manganite Upon Low-Level Chromium Substitution, George Tsekouras, Artur Braun
Conductivity And Oxygen Reduction Activity Changes In Lanthanum Strontium Manganite Upon Low-Level Chromium Substitution, George Tsekouras, Artur Braun
Australian Institute for Innovative Materials - Papers
On the timescale of solid oxide fuel cell (SOFC) system lifetime requirements, the thermodynamically predicted low-level substitution of chromium on the B-site of (La,Sr)MnO3 could be a source of cathode degradation underlying more overt and well-known chromium poisoning mechanisms. To study this phenomenon in isolation, electronic conductivity (σ) and electrochemical oxygen reduction activity of the (La0.8Sr0.2)0.98CrxMn1−xO3 model series (x = 0, 0.02, 0.05 or 0.1) were measured in air between 850 and 650 °C. Depending on the extent of chromium substitution and the measurement temperature, electrochemical …
Degradation Of The Remanent Ferromagnetic State Under The Action Of Ferroelectric Relaxation Processes In Co/(1-X)Pmn-Xpt/Co Hybrids: Possible Implications On Cryogenic And Room-Temperature Applications, Dimosthenis Stamopoulos, M Zeibekis, G Vertsioti, Shujun Zhang
Degradation Of The Remanent Ferromagnetic State Under The Action Of Ferroelectric Relaxation Processes In Co/(1-X)Pmn-Xpt/Co Hybrids: Possible Implications On Cryogenic And Room-Temperature Applications, Dimosthenis Stamopoulos, M Zeibekis, G Vertsioti, Shujun Zhang
Australian Institute for Innovative Materials - Papers
Low-dimensional hybrid structures of heterogeneous constituents usually exhibit abnormal properties, a fact that makes such hybrids attractive for various cryogenic and room-temperature applications. Here, we studied Co/(1 - x)Pb(Mg 1/3 Nb 2/3 )O 3 -xPbTiO 3 /Co (Co/PMN-xPT/Co) with x=0.29 and 0.30, specifically focusing on the evolution of the remanent ferromagnetic state, m rem of the Co outer layers in the whole temperature range from 300K down to 10K, upon application of an external electric field, E ex . We observed that m rem was vulnerable to degradation through the occurrence of electric field-induced magnetic instabilities (EMIs) that appeared only …
High Temperature, High Power Piezoelectric Composite Transducers, Hyeong Jae Lee, Shujun Zhang, Yoseph Bar-Cohen, Stewart Sherrit
High Temperature, High Power Piezoelectric Composite Transducers, Hyeong Jae Lee, Shujun Zhang, Yoseph Bar-Cohen, Stewart Sherrit
Australian Institute for Innovative Materials - Papers
Piezoelectric composites are a class of functional materials consisting of piezoelectric active materials and non-piezoelectric passive polymers, mechanically attached together to form different connectivities. These composites have several advantages compared to conventional piezoelectric ceramics and polymers, including improved electromechanical properties, mechanical flexibility and the ability to tailor properties by using several different connectivity patterns. These advantages have led to the improvement of overall transducer performance, such as transducer sensitivity and bandwidth, resulting in rapid implementation of piezoelectric composites in medical imaging ultrasounds and other acoustic transducers. Recently, new piezoelectric composite transducers have been developed with optimized composite components that have …
Giant Electrocaloric Effect In Bazr0.2ti0.8o3 Thick Film, Hui-Jian Ye, Xiaoshi Qian, Dae Yong Jeong, Shujun Zhang, Yue Zhou, Wen-Zhu Shao, Liang Zhen, Q M. Zhang
Giant Electrocaloric Effect In Bazr0.2ti0.8o3 Thick Film, Hui-Jian Ye, Xiaoshi Qian, Dae Yong Jeong, Shujun Zhang, Yue Zhou, Wen-Zhu Shao, Liang Zhen, Q M. Zhang
Australian Institute for Innovative Materials - Papers
We report the giant electrocaloric effect (ECE) of BaZr0.2Ti0.8O3 (BZT) thick film near room temperature. The BZT thick film was fabricated by the tape casting method with the thickness of 12.0 μm. Due to the near invariant critical point composition, relaxor behavior, and the stress generated between the film and the substrate, the thick film exhibits a large adiabatic temperature drop ΔT = −7 °C under 19.5 MV/m electric field, large EC coefficient ΔT/ΔE = 0.50 x 10−6 K · m · V−1, ΔS/ΔE = 0.88 x 10−6 J · m · kg−1 · K−1 · V−1 over a wide …
High-Order Face-Shear Modes Of Relaxor-Pbtio3 Crystals For Piezoelectric Motor Applications, Penghong Ci, Guoxi Liu, Zhijiang Chen, Shujun Zhang, Shuxiang Dong
High-Order Face-Shear Modes Of Relaxor-Pbtio3 Crystals For Piezoelectric Motor Applications, Penghong Ci, Guoxi Liu, Zhijiang Chen, Shujun Zhang, Shuxiang Dong
Australian Institute for Innovative Materials - Papers
The face-shear vibration modes of [011] poled Zt ± 45° cut relaxor-PT crystals and their applications for linear piezoelectric motors were investigated. Unlike piezoelectric ceramics, the rotated crystal was found to exhibit asymmetric face-shear deformations, and its two high-order face-shear modes degraded into two non-isomorphic modes. As an application example, a standing wave ultrasonic linear motor (10 × 10 × 2 mm3) operating in high-order face-shear vibration modes was developed. The motor exhibits a large driving force (1.5 N) under a low driving voltage (22 Vpp). These findings could provide guidance for design of crystal resonance devices.
B-Nmr Of 8li+ In Rutile Tio2, R M. L Mcfadden, David L. Cortie, D J. Arseneau, T Buck, C-C Chen, M H. Dehn, S Dunsiger, R F. Kiefl, C D. P Levy, C D. Li, G D. Morris, M R. Pearson, D Samuelis, J Xiao, J Maier, W A. Macfarlane
B-Nmr Of 8li+ In Rutile Tio2, R M. L Mcfadden, David L. Cortie, D J. Arseneau, T Buck, C-C Chen, M H. Dehn, S Dunsiger, R F. Kiefl, C D. P Levy, C D. Li, G D. Morris, M R. Pearson, D Samuelis, J Xiao, J Maier, W A. Macfarlane
Australian Institute for Innovative Materials - Papers
We report preliminary low-energy B-NMR measurements of 8Li+ implanted in single crystal rutile TiO2 at an applied field of 6.55 T and 300 K. We observe a broad 12 kHz wide quadrupole split resonance with unresolved features and a sharp component at the Larmor frequency. The line broadening may be caused by overlapping multi-quantum transitions or motion of 8Li+ on the scale of its lifetime (1.21 s). We also find spin-lattice relaxation that is relatively fast compared to other wide band gap insulators. The origin of this fast relaxation is also likely quadrupolar and may be due to anisotropic 8Li+ …
B-Nmr Study Of A Buried Mn &-Doped Layer In A Silicon Host, David L. Cortie, T Buck, R M. L Mcfadden, J Xiao, C D. P Levy, M H. Dehn, M R. Pearson, G D. Morris, S Dunsiger, R F. Kiefl, F Rueb, A Fuhrer, W A. Macfarlane
B-Nmr Study Of A Buried Mn &-Doped Layer In A Silicon Host, David L. Cortie, T Buck, R M. L Mcfadden, J Xiao, C D. P Levy, M H. Dehn, M R. Pearson, G D. Morris, S Dunsiger, R F. Kiefl, F Rueb, A Fuhrer, W A. Macfarlane
Australian Institute for Innovative Materials - Papers
Low temperature growth methods were used to encapsulate a buried Mn ¿-doping layer into a silicon host. A ¿-NMR investigation was performed of the magnetic properties in the temperature range 10-300 K using spin-polarized 8Li+. A depth-dependent broadening and shift of the NMR resonance was detected that is consistent with internal fields distributed at depths of 10-30 nm beneath the surface. At low temperatures, a negative relative shift occurred and the resonance was significantly broadened. At 300 K the line-shape could be described by a single Gaussian line, however, at 10 K the line is best approximated by a two …
Sr Measurements Of The Magnetism Of Sr3fe2o7, W A. Macfarlane, D Peets, T Buck, K H. Chow, David L. Cortie, A Jain, C Pomerantz, C B. L Tschense, D Wang, B Keimer
Sr Measurements Of The Magnetism Of Sr3fe2o7, W A. Macfarlane, D Peets, T Buck, K H. Chow, David L. Cortie, A Jain, C Pomerantz, C B. L Tschense, D Wang, B Keimer
Australian Institute for Innovative Materials - Papers
We present a preliminary report of zero and transverse field ¿SR measurements in a high quality single crystal of fully oxygenated Sr3Fe2O7[1], the insulating 3d magnetic analogue of the well studied Sr3Ru2O7, in its charge-disproportionated state, through the magnetic transition to the incommensurate phase at TN ¿ 115 K. A very broad distribution of static fields below Tn yields a large (2/3) missing fraction. Rapidly damped zero field oscillations indicate a large internal field at the muon, estimated to be 0.46 T at 0 K. In the paramagnetic state, we find two muon precession frequencies at 0.25 T applied field, …
Spin Depolarization Of Muonium In Mesoporous Silica, M H. Dehn, D J. Arseneau, M D. Bridges, T Buck, David L. Cortie, S P. Cottrell, D G. Fleming, J A. Kelly, W A. Macfarlane, M J. Maclachlan, G D. Morris, I Mckenzie, J Xiao, R F. Kiefl
Spin Depolarization Of Muonium In Mesoporous Silica, M H. Dehn, D J. Arseneau, M D. Bridges, T Buck, David L. Cortie, S P. Cottrell, D G. Fleming, J A. Kelly, W A. Macfarlane, M J. Maclachlan, G D. Morris, I Mckenzie, J Xiao, R F. Kiefl
Australian Institute for Innovative Materials - Papers
We report muon spin rotation/relaxation measurements of muonium in mesoporous silica (SBA-15) with a high specific surface area of 600 m2/g. Up to 70 percent of the incoming muons form muonium and escape efficiently into the open pores at all temperatures between 3 and 300K. We present evidence that the interaction with the silica surfaces involves both spin exchange and a transition to a diamagnetic state, possibly due to dangling bonds on the surface. At very low temperatures, below 20K, the interaction between muonium and the silica surfaces is suppressed due to a He film coating the surfaces. These results …
Electronic Evidence Of An Insulator-Superconductor Crossover In Single-Layer Fese/Srtio3 Films, Junfeng He, Xu Liu, Wenhao Zhang, Lin Zhao, Defa Liu, Shaolong He, Daixiang Mou, Fangsen Li, Chenjia Tang, Zhi Li, Lili Wang, Yingying Peng, Yan Liu, Chaoyu Chen, Li Yu, Guodong Liu, Xiaoli Dong, Jun Zhang, Chuangtian Chen, Zuyan Xu, Xi Chen, Xu-Cun Ma, Qikun Xue, X J. Zhou
Electronic Evidence Of An Insulator-Superconductor Crossover In Single-Layer Fese/Srtio3 Films, Junfeng He, Xu Liu, Wenhao Zhang, Lin Zhao, Defa Liu, Shaolong He, Daixiang Mou, Fangsen Li, Chenjia Tang, Zhi Li, Lili Wang, Yingying Peng, Yan Liu, Chaoyu Chen, Li Yu, Guodong Liu, Xiaoli Dong, Jun Zhang, Chuangtian Chen, Zuyan Xu, Xi Chen, Xu-Cun Ma, Qikun Xue, X J. Zhou
Australian Institute for Innovative Materials - Papers
In high-temperature cuprate superconductors, it is now generally agreed that superconductivity is realized by doping an antiferromagnetic Mott (charge transfer) insulator. The doping-induced insulator-to-superconductor transition has been widely observed in cuprates, which provides important information for understanding the superconductivity mechanism. In the iron-based superconductors, however, the parent compound is mostly antiferromagnetic bad metal, raising a debate on whether an appropriate starting point should go with an itinerant picture or a localized picture. No evidence of doping-induced insulator-superconductor transition (or crossover) has been reported in the iron-based compounds so far. Here, we report an electronic evidence of an insulator-superconductor crossover observed …