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Articles 1021 - 1050 of 1524
Full-Text Articles in Physical Sciences and Mathematics
In Situ Engineering Of Urchin-Like Reduced Graphene Oxide-Mn 2o3-Mn3o4 Nanostructures For Supercapacitors, Alfred Tawirirana Chidembo, Seyed Hamed Aboutalebi, Konstantin Konstantinov, Charl Jeremy Jafta, Hua-Kun Liu, Kenneth Ikechukwu Ozoemena
In Situ Engineering Of Urchin-Like Reduced Graphene Oxide-Mn 2o3-Mn3o4 Nanostructures For Supercapacitors, Alfred Tawirirana Chidembo, Seyed Hamed Aboutalebi, Konstantin Konstantinov, Charl Jeremy Jafta, Hua-Kun Liu, Kenneth Ikechukwu Ozoemena
Australian Institute for Innovative Materials - Papers
We report the use of a spray pyrolysis method to synthesize high surface area (BET surface area of 139 m2 g-1) self-organized, micron sized urchin-like composites made up of reduced graphene oxide and needle-shaped manganese oxide (rGO-Mn2O3-Mn 3O4). Maximum capacitances of 425 Fg-1 at 5 mV s-1 from a three electrode set up and 133 Fg-1 at a current density of 0.2 Ag-1 were recorded using an asymmetric two electrode set up with graphene as the anode. The composite material also showed a capacitance retention of 83% over 1000 cycles. We attribute this remarkable performance to the high specific surface …
Electrochemical Nonenzymatic Sensor Based On Coo Decorated Reduced Graphene Oxide For The Simultaneous Determination Of Carbofuran And Carbaryl In Fruits And Vegetables, Mingyan Wang, Junrao Huang, Meng Wang, Dongen Zhang, Jun Chen
Electrochemical Nonenzymatic Sensor Based On Coo Decorated Reduced Graphene Oxide For The Simultaneous Determination Of Carbofuran And Carbaryl In Fruits And Vegetables, Mingyan Wang, Junrao Huang, Meng Wang, Dongen Zhang, Jun Chen
Australian Institute for Innovative Materials - Papers
A novel nonenzymatic sensor based on cobalt (II) oxide (CoO)-decorated reduced graphene oxide (rGO) was developed for the detection of carbofuran (CBF) and carbaryl (CBR). Two well-defined and separate differential pulse voltammetric peaks for CBF and CBR were obtained with the CoO/rGO sensor in a mixed solution, making the simultaneous detection of both carbamate pesticides possible. The nonenzymatic sensor demonstrated a linear relationship over a wide concentration range of 0.2–70 μM (R = 0.9996) for CBF and 0.5–200 μM (R = 0.9995) for CBR. The lower detection limit of the sensor was 4.2 μg/L for CBF and 7.5 μg/L for …
Extrusion Printed Graphene/Polycaprolactone/ Composites For Tissue Engineering, Sepidar Sayyar, Rhys Cornock, Eoin Murray, Stephen Beirne, David L. Officer, Gordon G. Wallace
Extrusion Printed Graphene/Polycaprolactone/ Composites For Tissue Engineering, Sepidar Sayyar, Rhys Cornock, Eoin Murray, Stephen Beirne, David L. Officer, Gordon G. Wallace
Australian Institute for Innovative Materials - Papers
In this work fibres and complex three-dimensional scaffolds of a covalently linked graphene-polycaprolactone composite were successfully extruded and printed using a melt extrusion printing system. Fibres with varying diameters and morphologies, as well as complex scaffolds were fabricated using an additive fabrication approach and were characterized. It was found that the addition of graphene improves the mechanical properties of the fibres by over 50% and in vitro cytotoxicity tests showed good biocompatibility indicating a promising material for tissue engineering applications.
Magnetic Phase Transitions And Entropy Change In Layered Ndmn1.7cr0.3si2, M F. Md Din, Jianli Wang, S J. Campbell, A J. Studer, M Avdeev, S J. Kennedy, Q F. Gu, R Zeng, S X. Dou
Magnetic Phase Transitions And Entropy Change In Layered Ndmn1.7cr0.3si2, M F. Md Din, Jianli Wang, S J. Campbell, A J. Studer, M Avdeev, S J. Kennedy, Q F. Gu, R Zeng, S X. Dou
Australian Institute for Innovative Materials - Papers
A giant magnetocaloric effect has been observed around the Curie temperature, TC ∼ 42 K, in NdMn1.7Cr0.3Si2 with no discernible thermal and magnetic hysteresis losses. Below 400 K, three magnetic phase transitions take place around 380 K, 320 K and 42 K. Detailed high resolution synchrotron and neutron powder diffraction (10-400 K) confirmed the magnetic transitions and phases as follows: TN intra ∼ 380 K denotes the transition from paramagnetism to intralayer antiferromagnetism (AFl), TN inter ∼ 320 K represents the transition from the AFl structure to the canted antiferromagnetic spin structure (AFmc), while TC ∼ 42 K denotes the …
Hollow Mnco2o4 Submicrospheres With Multilevel Interiors: From Mesoporous Spheres To Yolk-In-Double-Shell Structures, Jingfa Li, Jiazhao Wang, Xin Liang, Zhijia Zhang, Hua-Kun Liu, Yitai Qian, Shenglin Xiong
Hollow Mnco2o4 Submicrospheres With Multilevel Interiors: From Mesoporous Spheres To Yolk-In-Double-Shell Structures, Jingfa Li, Jiazhao Wang, Xin Liang, Zhijia Zhang, Hua-Kun Liu, Yitai Qian, Shenglin Xiong
Australian Institute for Innovative Materials - Papers
We present a general strategy to synthesize uniform MnCo2O4 submicrospheres with various hollow structures. By using MnCo-glycolate submicrospheres as the precursor with proper manipulation of ramping rates during the heating process, we have fabricated hollow MnCo2O4 submicrospheres with multilevel interiors, including mesoporous spheres, hollow spheres, yolk-shell spheres, shell-in-shell spheres, and yolk-in-double-shell spheres. Interestingly, when tested as anode materials in lithium ion batteries, the MnCo2O4 submicrospheres with a yolk-shell structure showed the best performance among these multilevel interior structures because these structures can not only supply a high contact area but also maintain a stable structure.
Nonlinear Optical Conductivity Of Two-Dimensional Semiconductors With Rashba Spin-Orbit Coupling In Terahertz Regime, Yee Sin Ang, J C. Cao, Chao Zhang
Nonlinear Optical Conductivity Of Two-Dimensional Semiconductors With Rashba Spin-Orbit Coupling In Terahertz Regime, Yee Sin Ang, J C. Cao, Chao Zhang
Australian Institute for Innovative Materials - Papers
We reveal that two-dimensional semiconductors with Rashba spin-orbit interaction (R2DG) exhibit exceptionally strong nonlinear optical response (NOR) in the terahertz frequency regime. The spin-split of the parabolic energy band in R2DG allows strong multiple-photon process to occur via inter-subband mechanism. We show sharp multiple photon edges in the nonlinear conductivity. The edges correspond to the cut-off effect produced by the multiple-photon process. For Rashba coupling parameter of λ R ≈ 10−10 eV m, electric field strength in the order of only 102 V/cm is required for the NOR to dominate over the linear response. Furthermore, the roles of the parabolic …
Optimization Of The Sequential Polymerization Synthesis Method For Polypyrrole Films, Danial Sangian, Wen Zheng, Geoffrey M. Spinks
Optimization Of The Sequential Polymerization Synthesis Method For Polypyrrole Films, Danial Sangian, Wen Zheng, Geoffrey M. Spinks
Australian Institute for Innovative Materials - Papers
Polypyrrole (PPy) is widely used as an electroactive material and is most often synthesized using electrochemical polymerization. Recently, a new electropolymerization method [1] was introduced that involved preparing the PPy as a sequential series of electrodeposited layers with solvent washing in between each deposited layer. This method enabled high quality PPy free-standing films to be prepared in a relatively short time. The purpose of the present study was to investigate the effect of the polymerization current density on the mechanical and electrical properties of the sequentially polymerized (SEP) PPy films. It was found that a low current density (0.1 mA/cm2) …
Neutron Diffraction Study Of Mnniga2 - Structural And Magnetic Behaviour, Jianli Wang, L Ma, M Hofmann, M Avdeev, S J. Kennedy, S J. Campbell, M F. Md Din, M Hoelzel, G H. Wu, S X. Dou
Neutron Diffraction Study Of Mnniga2 - Structural And Magnetic Behaviour, Jianli Wang, L Ma, M Hofmann, M Avdeev, S J. Kennedy, S J. Campbell, M F. Md Din, M Hoelzel, G H. Wu, S X. Dou
Australian Institute for Innovative Materials - Papers
MnNiGa2 crystallizes in the L21 (Heusler) structure and has a ferromagnetic ordering temperature TC ∼ 192 K. Rietveld refinement of the neutron diffraction patterns indicates that the Ga atoms occupy the equivalent 8c position, while Mn and Ni share the 4a (0, 0, 0) and 4b (0.5, 0.5, 0.5) sites with a mixed occupancy of Mn and Ni atoms. It is found that that ∼83% of Mn and ∼17% Ni are located at the 4a site while ∼83% of Ni and ∼17% Mn occupy the 4b site. There is no evidence of a magneto-volume effect around TC. In agreement with …
A Germanium/Single-Walled Carbon Nanotube Composite Paper As A Free-Standing Anode For Lithium-Ion Batteries, Jun Wang, Jiazhao Wang, Ziqi Sun, Xuanwen Gao, Chao Zhong, Shulei Chou, Hua-Kun Liu
A Germanium/Single-Walled Carbon Nanotube Composite Paper As A Free-Standing Anode For Lithium-Ion Batteries, Jun Wang, Jiazhao Wang, Ziqi Sun, Xuanwen Gao, Chao Zhong, Shulei Chou, Hua-Kun Liu
Australian Institute for Innovative Materials - Papers
Paper-like free-standing germanium (Ge) and single-walled carbon nanotube (SWCNT) composite anodes were synthesized by the vacuum filtration of Ge/SWCNT composites, which were prepared by a facile aqueous-based method. The samples were characterized by X-ray diffraction, field emission scanning electron microscopy, and transmission electron microscopy. Electrochemical measurements demonstrate that the Ge/SWCNT composite paper anode with the weight percentage of 32% Ge delivered a specific discharge capacity of 417 mA h g−1 after 40 cycles at a current density of 25 mA g−1, 117% higher than the pure SWCNT paper anode. The SWCNTs not only function as a flexible mechanical support for …
Thin, Tough, Ph-Sensitive Hydrogel Films With Rapid Load Recovery, Sina Naficy, Geoffrey M. Spinks, Gordon G. Wallace
Thin, Tough, Ph-Sensitive Hydrogel Films With Rapid Load Recovery, Sina Naficy, Geoffrey M. Spinks, Gordon G. Wallace
Australian Institute for Innovative Materials - Papers
Stimuli-responsive hydrogels are used as the building blocks of actuators and sensors. Their application has been limited, however, by their lack of mechanical strength and recovery from loading. Here, we report the preparation of pH-sensitive hydrogels as thin as 20 μm. The hydrogels are made of a polyether-based polyurethane and poly(acrylic acid). A simple method was employed to create hydrogels with thicknesses in the range of 20-570 μm. The hydrogel films volume changed by a factor of ∼2 when the pH was switched around the transition point (pH 4). Tensile extensibilities of up to ∼350% were maintained at each pH, …
Temperature Dependent Photoexcited Carrier Dynamics In Multiferroic Bifeo3 Film: A Hidden Phase Transition, Zeyu Zhang, Zuanming Jin, Qunfeng Pan, Yue Xu, Xian Lin, Guohong Ma, Zhenxiang Cheng
Temperature Dependent Photoexcited Carrier Dynamics In Multiferroic Bifeo3 Film: A Hidden Phase Transition, Zeyu Zhang, Zuanming Jin, Qunfeng Pan, Yue Xu, Xian Lin, Guohong Ma, Zhenxiang Cheng
Australian Institute for Innovative Materials - Papers
The ultrafast carrier dynamics of the multiferroic BiFeO3 film in a broad temperature range is investigated using optical pump-probe spectroscopy. The photoexcited electrons release their energy with optical phonons emission through electron-phonon coupling in about 1 ps. The following intermediate process is identified as dynamical spin-lattice coupling in several picoseconds. Furthermore, the peak values of the optical reflectivity and the time constants of carrier relaxation channels show significant changes while the temperature varies from 137.5 K to around 195 K, this aligns with the previously reported hidden phase transition. Our study demonstrates that ultrafast spectroscopy is a sensitive method to …
Three Dimensional (3d) Printed Electrodes For Interdigitated Supercapacitors, Chen Zhao, Caiyun Wang, Robert Gorkin Iii, Stephen Beirne, Kewei Shu, Gordon G. Wallace
Three Dimensional (3d) Printed Electrodes For Interdigitated Supercapacitors, Chen Zhao, Caiyun Wang, Robert Gorkin Iii, Stephen Beirne, Kewei Shu, Gordon G. Wallace
Australian Institute for Innovative Materials - Papers
Common fabrication techniques typically require multiple and complex MEMS processing steps to create 3D electrode architectures. Here we report on the use of Additive Fabrication metal printing based on Selective Laser Melting (SLM) technology to produce 3D titanium interdigitated electrodes. This was used as a platform to deposit polypyrrole and the resultant structure was evaluated for use as a capacitive electrode. We also demonstrate a solid-state interdigitated supercapacitor using a poly(vinyl alcohol) (PVA)-H3PO4 polymer electrolyte.
Liquid Ink Deposition From An Atomic Force Microscope Tip: Deposition Monitoring And Control Of Feature Size, Cathal D. O'Connell, Michael J. Higgins, David Marusic, Simon E. Moulton, Gordon G. Wallace
Liquid Ink Deposition From An Atomic Force Microscope Tip: Deposition Monitoring And Control Of Feature Size, Cathal D. O'Connell, Michael J. Higgins, David Marusic, Simon E. Moulton, Gordon G. Wallace
Australian Institute for Innovative Materials - Papers
The controlled deposition of attoliter volumes of liquid inks may engender novel applications such as targeted drug delivery to single cells and localized delivery of chemical reagents at nanoscale dimensions. Although the deposition of small organic molecules from an atomic force microscope tip, known as dip-pen nanolithography (DPN), has been extensively studied, the deposition of liquid inks is little understood. In this work, we have used a set of model ink-substrate systems to develop an understanding of the deposition of viscous liquids using an unmodified AFM tip. First, the growth of dot size with increasing dwell time is characterized. The …
Ultra-Small Fluorescent Inorganic Nanoparticles For Bioimaging, Zhen Li, Qiao Sun, Yian Zhu, Bien Tan, Zhi Ping Xu, S X. Dou
Ultra-Small Fluorescent Inorganic Nanoparticles For Bioimaging, Zhen Li, Qiao Sun, Yian Zhu, Bien Tan, Zhi Ping Xu, S X. Dou
Australian Institute for Innovative Materials - Papers
The novel optical, electrical, and magnetic properties of ultra-small inorganic nanoparticles make them very attractive in diverse applications in the fields of health, clean and renewable energy, and environmental sustainability. This article comprehensively summarizes state-of-the-art fluorescence imaging using ultra-small nanoparticles as probes, including quantum dots, metal nanoclusters, carbon nanomaterials, up-conversion, and silicon nanomaterials.
Reinforcing Biopolymer Hydrogels With Ionic-Covalent Entanglement Hydrogel Microspheres, Damian Martin Kirchmajer, Marc In Het Panhuis
Reinforcing Biopolymer Hydrogels With Ionic-Covalent Entanglement Hydrogel Microspheres, Damian Martin Kirchmajer, Marc In Het Panhuis
Australian Institute for Innovative Materials - Papers
Microscopic hydrogel spheres can be used to improve the mechanical properties of conventional hydrogels. We prepared ionic-covalent entanglement (ICE) hydrogel microspheres of calcium cross-linked gellan gum and genipin cross-linked gelatin using a water-in-oil emulsion-based processing technique. The method was optimized to produce microspheres with number average diameter 4 ± 1 µm. These ICE microspheres were used to reinforce gelatin hydrogels and improve their compressive mechanical properties. The strongest microsphere reinforced hydrogels possessed a compressive mechanical stress at failure of 0.50 ± 0.1 MPa and a compressive secant modulus of 0.18 ± 0.02 MPa.
Controllable Morphology Of Flux Avalanches In Microstructured Superconductors, M Motta, F Colauto, J I. Vestgarden, Joachim Fritzsche, M Timmermans, J Cuppens, C Attanasio, C Cirillo, V V. Moshchalkov, J Van De Vondel, Tom H. Johansen, W A. Ortiz, A V. Silhanek
Controllable Morphology Of Flux Avalanches In Microstructured Superconductors, M Motta, F Colauto, J I. Vestgarden, Joachim Fritzsche, M Timmermans, J Cuppens, C Attanasio, C Cirillo, V V. Moshchalkov, J Van De Vondel, Tom H. Johansen, W A. Ortiz, A V. Silhanek
Australian Institute for Innovative Materials - Papers
The morphology of abrupt bursts of magnetic flux into superconducting films with engineered periodic pinning centers (antidots) has been investigated. Guided flux avalanches of thermomagnetic origin develop a treelike structure, with the main trunk perpendicular to the borders of the sample, while secondary branches follow well-defined directions determined by the geometrical details of the underlying periodic pinning landscape. Strikingly, we demonstrate that in a superconductor with relatively weak random pinning the morphology of such flux avalanches can be fully controlled by proper combinations of lattice symmetry and antidot geometry. Moreover, the resulting flux patterns can be reproduced, to the finest …
Strong Tough Gels For 3d Tissue Constructs, Paul Calvert, Marc In Het Panhuis, Geoffrey Spinks, Robert Gorkin Iii, Leo Stevens, Shannon E. Bakarich, Paul Balding, Damian M. Kirchmajer
Strong Tough Gels For 3d Tissue Constructs, Paul Calvert, Marc In Het Panhuis, Geoffrey Spinks, Robert Gorkin Iii, Leo Stevens, Shannon E. Bakarich, Paul Balding, Damian M. Kirchmajer
Australian Institute for Innovative Materials - Papers
The mechanical characteristics of ionic-covalent entanglement hydrogels consisting of combinations of the biopolymers gellan gum and kappa-carrageenan, and the synthetic polymers polyacrylamide and an epoxy amine were investigated. Compression testing showed that these gels exhibited "double network" behavior, i.e. strong tough gels.
Spin-Cycloid Instability As The Origin Of Weak Ferromagnetism In The Disordered Perovskite Bi0.8la0.2fe0.5mn0.5o3, J Bertinshaw, D L. Cortie, Z X. Cheng, M Avdeev, A J. Studer, F Klose, C Ulrich, X L. Wang
Spin-Cycloid Instability As The Origin Of Weak Ferromagnetism In The Disordered Perovskite Bi0.8la0.2fe0.5mn0.5o3, J Bertinshaw, D L. Cortie, Z X. Cheng, M Avdeev, A J. Studer, F Klose, C Ulrich, X L. Wang
Australian Institute for Innovative Materials - Papers
Powder neutron diffraction and magnetometry studies have been conducted to investigate the crystallographic and magnetic structure of Bi0.8La0.2Fe0.5Mn0. 5O3. The compound stabilizes in the Imma orthorhombic crystal symmetry in the measured temperature range of 5 to 380 K, with a transition to antiferromagnetic order at TN≈240 K. The spin cycloid present for BiFeO3 is found to be absent with 50% Mn3+ cation substitution, leading to G-type antiferromagnetic order with an enhanced out-of-plane canted ferromagnetic component, evident from measurable weak-ferromagnetic hysteresis. Structural modifications do not solely explain this behavior, indicating that modified electron exchange interactions must be taken into account. A …
Current-Voltage Characteristics Of Nb-Carbon-Nb Junctions, I P. Nevirkovets, S E. Shafranjuk, O Chernyashevskyy, Nandhag Masilamani, J Ketterson
Current-Voltage Characteristics Of Nb-Carbon-Nb Junctions, I P. Nevirkovets, S E. Shafranjuk, O Chernyashevskyy, Nandhag Masilamani, J Ketterson
Australian Institute for Innovative Materials - Papers
We report on properties of Nb(/Ti)-carbon-(Ti/)Nb junctions fabricated on graphite flakes using e-beam lithography. The devices were characterized at temperatures above 1.8 K where a Josephson current was not observed, but the differential conductivity revealed features below the critical temperature of Nb, and overall metallic conductivity, in spite of a high-junctions resistance. Since the conductivity of graphite along the planes is essentially two-dimensional (2D), we use a theoretical model developed for metal/graphene junctions for interpretation of the results. The model involves two very different graphene "access" lengths. The shorter length characterizes ordinary tunneling between the three-dimensional Nb(/Ti) electrode and 2D …
Strain-Responsive Polyurethane/Pedot:Pss Elastomeric Composite Fibers With High Electrical Conductivity, Mohammad Ziabari Seyedin, Joselito M. Razal, Peter C. Innis, Gordon G. Wallace
Strain-Responsive Polyurethane/Pedot:Pss Elastomeric Composite Fibers With High Electrical Conductivity, Mohammad Ziabari Seyedin, Joselito M. Razal, Peter C. Innis, Gordon G. Wallace
Australian Institute for Innovative Materials - Papers
It is a challenge to retain the high stretchability of an elastomer when used in polymer composites. Likewise, the high conductivity of organic conductors is typically compromised when used as filler in composite systems. Here, it is possible to achieve elastomeric fiber composites with high electrical conductivity at relatively low loading of the conductor and, more importantly, to attain mechanical properties that are useful in strain-sensing applications. The preparation of homogenous composite formulations from polyurethane (PU) and poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) that are also processable by fiber wet-spinning techniques are systematically evaluated. With increasing PEDOT:PSS loading in the fiber composites, the Young's …
Interface Strain-Induced Multiferroicity In A Smfeo3 Film, Zhenxiang Cheng, Fang Hong, Yuanxu Wang, Kiyoshi Ozawa, Hiroki Fujii, Hideo Kimura, Yi Du, Xiaolin Wang, S X. Dou
Interface Strain-Induced Multiferroicity In A Smfeo3 Film, Zhenxiang Cheng, Fang Hong, Yuanxu Wang, Kiyoshi Ozawa, Hiroki Fujii, Hideo Kimura, Yi Du, Xiaolin Wang, S X. Dou
Australian Institute for Innovative Materials - Papers
An epitaxial pseudocubic SmFeO3 thin film on (100) Nb-SrTiO 3 was studied based on ferroelectric (FE) characterization and magnetic measurements. High-resolution transmission electron microscopy images clarify the nature of the epitaxial growth, the stress-induced structural distortion at the film/substrate interface, and the existence of two different orientation lattices. Clear grain boundaries can be seen, which could introduce an extra local distortion. Rectangular FE loops can be observed at room temperature, even by just applying a small voltage ranging from -1 to +1 V, indicative of the presence of FE polarization. Piezoelectric force microscopy images confirm the existence of FE domains …
Magnetic Properties And Magnetocaloric Effect Of Ndmn2-Xcuxsi2 Compounds, M F. Md Din, Jianli Wang, M Avdeev, Q F. Gu, R Zeng, S J. Campbell, S J. Kennedy, S X. Dou
Magnetic Properties And Magnetocaloric Effect Of Ndmn2-Xcuxsi2 Compounds, M F. Md Din, Jianli Wang, M Avdeev, Q F. Gu, R Zeng, S J. Campbell, S J. Kennedy, S X. Dou
Australian Institute for Innovative Materials - Papers
Structural and magnetic properties of NdMn2−x Cu xSi2 compounds (x = 0-1.0) have been investigated by high intensity x-ray and resolution neutron diffraction (3-450 K), specific heat, dc magnetization, and differential scanning calorimetry measurements. Substitution of Cu for Mn leads to an increase in the lattice parameter a but a decrease in c at room temperature. Two magnetic phase transitions have been found for NdMn2−x Cu xSi2 compounds with TN for the antiferromagnetic ordering of Mn-sublatttice and TC for the Nd-sublattice ferromagnetic ordering, respectively. TC increases significantly with increasing Cu content from 36 K at x = 0 to 100 …
A Solvothermal Strategy: One-Step In Situ Synthesis Of Self-Assembled 3d Graphene-Based Composites With Enhanced Lithium Storage Capacity, Jingjing Ma, Jiulin Wang, Yu-Shi He, Xiao Zhen Liao, Jun Chen, Jiazhao Wang, Tao Yuan, Zi-Feng Ma
A Solvothermal Strategy: One-Step In Situ Synthesis Of Self-Assembled 3d Graphene-Based Composites With Enhanced Lithium Storage Capacity, Jingjing Ma, Jiulin Wang, Yu-Shi He, Xiao Zhen Liao, Jun Chen, Jiazhao Wang, Tao Yuan, Zi-Feng Ma
Australian Institute for Innovative Materials - Papers
A facile and controllable approach has been developed to synthesize three-dimensional (3D) graphene-based monoliths. Here, as a proof-of-concept experiment, self-assembled 3D CoO/graphene sheets (CoO/GS) composites with porous structures have been successfully fabricated in an ethanol medium by a one-step, in situ growth, solvothermal method. During the process, the in situ nucleation and growth of CoO particles on GS were tuned by the formation of a 3D GS network. In the as-prepared composites, the self-assembled 3D GS network around the CoO particles can not only provide a 3D conductive matrix, but also buffer the volume changes of CoO and restrain the …
Highly Connected Hierarchical Textured Tio2 Spheres As Photoanodes For Dye-Sensitized Solar Cells, Jianjian Lin, Andrew Nattestad, Hua Yu, Yang Bai, Lianzhou Wang, S X. Dou, Jung Ho Kim
Highly Connected Hierarchical Textured Tio2 Spheres As Photoanodes For Dye-Sensitized Solar Cells, Jianjian Lin, Andrew Nattestad, Hua Yu, Yang Bai, Lianzhou Wang, S X. Dou, Jung Ho Kim
Australian Institute for Innovative Materials - Papers
We present a new type of microstructured TiO2 sea urchin-like assembly, composed of high aspect-ratio nanosheets. We also demonstrate the applicability of these structures as photoanodes in dye-sensitized solar cells, with 9.0% conversion efficiency realized, a considerable improvement over the commercial Dyesol paste (8.2%) under the same conditions. We reveal that this new TiO2 nanostructure is beneficial to enhanced dye loading and efficient light scattering. In particular, the interpenetrating individual sheets of the spheres result in more intimate interparticle connections and provide efficient electron transfer pathways.
A Computational Study Of Carbon Dioxide Adsorption On Solid Boron, Qiao Sun, Meng Wang, Zhen Li, Aijun Du, Debra J. Searles
A Computational Study Of Carbon Dioxide Adsorption On Solid Boron, Qiao Sun, Meng Wang, Zhen Li, Aijun Du, Debra J. Searles
Australian Institute for Innovative Materials - Papers
Capturing and sequestering carbon dioxide (CO2) can provide a route to partial mitigation of climate change associated with anthropogenic CO2 emissions. Here we report a comprehensive theoretical study of CO2 adsorption on two phases of boron, α-B12 and γ-B28. The theoretical results demonstrate that the electron deficient boron materials, such as α-B12 and γ-B 28, can bond strongly with CO2 due to Lewis acid-base interactions because the electron density is higher on their surfaces. In order to evaluate the capacity of these boron materials for CO2 capture, we also performed calculations with various degrees of CO2 coverage. The computational results …
Large Magnetoelectric Coupling In Magnetically Short-Range Ordered Bi5ti3feo15 Film, Hongyang Zhao, Hideo Kimura, Zhenxiang Cheng, Minoru Osada, Jianli Wang, Xiaolin Wang, S X. Dou, Yan Liu, Jianding Yu, Takao Matsumoto, Tetsuya Tohei, Naoya Shibata, Yuichi Ikuhara
Large Magnetoelectric Coupling In Magnetically Short-Range Ordered Bi5ti3feo15 Film, Hongyang Zhao, Hideo Kimura, Zhenxiang Cheng, Minoru Osada, Jianli Wang, Xiaolin Wang, S X. Dou, Yan Liu, Jianding Yu, Takao Matsumoto, Tetsuya Tohei, Naoya Shibata, Yuichi Ikuhara
Australian Institute for Innovative Materials - Papers
Multiferroic materials, which offer the possibility of manipulating the magnetic state by an electric field or vice versa, are of great current interest. However, single-phase materials with such cross-coupling properties at room temperature exist rarely in nature; new design of nano-engineered thin films with a strong magneto-electric coupling is a fundamental challenge. Here we demonstrate a robust room-temperature magneto-electric coupling in a bismuth-layer-structured ferroelectric Bi5Ti3FeO15 with high ferroelectric Curie temperature of ~1000 K. Bi5Ti3FeO15 thin films grown by pulsed laser deposition are single-phase layered perovskit with nearly (00l)-orientation. Room-temperature multiferroic behavior is demonstrated by a large modulation in magneto-polarization and …
Synthesis Of Potential Theranostic System Consisting Of Methotrexate-Immobilized (3-Aminopropyl)Trimethoxysilane Coated Α-Bi2o3 Nanoparticles For Cancer Treatment, Kathrin Bogusz, Moeava Tehei, Callum Stewart, Marjorie Mcdonald, Dean Cardillo, Michael Lerch, Stephanie Corde, Anatoly Rosenfeld, Hua-Kun Liu, Konstantin Konstantinov
Synthesis Of Potential Theranostic System Consisting Of Methotrexate-Immobilized (3-Aminopropyl)Trimethoxysilane Coated Α-Bi2o3 Nanoparticles For Cancer Treatment, Kathrin Bogusz, Moeava Tehei, Callum Stewart, Marjorie Mcdonald, Dean Cardillo, Michael Lerch, Stephanie Corde, Anatoly Rosenfeld, Hua-Kun Liu, Konstantin Konstantinov
Australian Institute for Innovative Materials - Papers
In this study we present the synthesis of a new theranostic system consisting of a core-shell structured nanoceramic-drug conjugate that can potentially combine chemotherapeutic, targeting, diagnostic and radio dose enhancing features in cancer treatment. The conjugate is made of α-Bi2O3 nanoparticles (NPs) which were first coated with (3-aminopropyl)trimethoxysilane (APTMS) to form a core-shell structure and then attached with methotrexate (MTX) through amidation between the amine moieties on the shell and the carboxylic acid groups on MTX. While α-Bi2O3 NPs with high effective atomic number can serve as both contrast agent and radiosensitiser in dose enhancement radiation therapy, MTX as an …
Power-Law Relationship Between Critical Current Density, Microstructure, And The N-Value In Mgb2 Superconductor Wires, Ashkan Motaman, Shaon Barua, Dipak Patel, Minoru Maeda, Kookchae Cheong, Jung Ho Kim, S X. Dou, Md Shahriar Al Hossain
Power-Law Relationship Between Critical Current Density, Microstructure, And The N-Value In Mgb2 Superconductor Wires, Ashkan Motaman, Shaon Barua, Dipak Patel, Minoru Maeda, Kookchae Cheong, Jung Ho Kim, S X. Dou, Md Shahriar Al Hossain
Australian Institute for Innovative Materials - Papers
Dissipation-free MgB2 superconducting wires are valuable in terms of practical applications. Herein, we have found a strong correlation between critical current density (J c ) and the n-value extracted from the electric field versus current density characteristic. The power-law relationship (m) between the J c and the n-value, n∝Jmc , represents a critical index which is strongly dependent on operating temperatures.
High-Performance Sodium-Ion Batteries And Sodium-Ion Pseudocapacitors Based On Mos2/Graphene Composites, Yunxiao Wang, Shulei Chou, David Wexler, Hua-Kun Liu, S X. Dou
High-Performance Sodium-Ion Batteries And Sodium-Ion Pseudocapacitors Based On Mos2/Graphene Composites, Yunxiao Wang, Shulei Chou, David Wexler, Hua-Kun Liu, S X. Dou
Australian Institute for Innovative Materials - Papers
Sodium-ion energy storage, including sodium-ion batteries (NIBs) and electrochemical capacitive storage (NICs), is considered as a promising alternative to lithium-ion energy storage. It is an intriguing prospect, especially for large-scale applications, owing to its low cost and abundance. MoS2 sodiation/desodiation with Na ions is based on the conversion reaction, which is not only able to deliver higher capacity than the intercalation reaction, but can also be applied in capacitive storage owing to its typically sloping charge/discharge curves. Here, NIBs and NICs based on a graphene composite (MoS2/G) were constructed. The enlarged d-spacing, a contribution of the graphene matrix, and the …
Chondrogenesis Of Infrapatellar Fat Pad Derived Adipose Stem Cells In 3d Printed Chitosan Scaffold, Ken Ye, Raed Felimban, Kathy Traianedes, Simon E. Moulton, Gordon G. Wallace, Johnson Chung, Anita Quigley, Peter F. M Choong, Damian E. Myers
Chondrogenesis Of Infrapatellar Fat Pad Derived Adipose Stem Cells In 3d Printed Chitosan Scaffold, Ken Ye, Raed Felimban, Kathy Traianedes, Simon E. Moulton, Gordon G. Wallace, Johnson Chung, Anita Quigley, Peter F. M Choong, Damian E. Myers
Australian Institute for Innovative Materials - Papers
Infrapatellar fat pad adipose stem cells (IPFP-ASCs) have been shown to harbor chondrogenic potential. When combined with 3D polymeric structures, the stem cells provide a source of stem cells to engineer 3D tissues for cartilage repair. In this study, we have shown human IPFP-ASCs seeded onto 3D printed chitosan scaffolds can undergo chondrogenesis using TGFβ3 and BMP6. By week 4, a pearlescent, cartilage-like matrix had formed that penetrated the top layers of the chitosan scaffold forming a 'cap' on the scaffold. Chondrocytic morphology showed typical cells encased in extracellular matrix which stained positively with toluidine blue. Immunohistochemistry demonstrated positive staining …