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Articles 841 - 870 of 1524
Full-Text Articles in Physical Sciences and Mathematics
Guanidinium Octahydrotriborate: An Ionic Liquid With High Hydrogen Storage Capacity, Weidong Chen, Zhenguo Huang, Guotao Wu, Teng He, Zhao Li, Juner Chen, Zaiping Guo, Hua-Kun Liu, Ping Chen
Guanidinium Octahydrotriborate: An Ionic Liquid With High Hydrogen Storage Capacity, Weidong Chen, Zhenguo Huang, Guotao Wu, Teng He, Zhao Li, Juner Chen, Zaiping Guo, Hua-Kun Liu, Ping Chen
Australian Institute for Innovative Materials - Papers
For chemical hydrogen storage, capacity is one key criterion that has spurred intense efforts to investigate compounds with high hydrogen content. The guanidinium cation and the octahydrotriborate anion possess 6 H+ and 8 H-, respectively. The combination of these two ions yields guanidinium octahydrotriborate with 13.8 wt% hydrogen. This paper presents its facile synthesis, as confirmed by 11B and 1H nuclear magnetic resonance spectroscopy. The results show that guanidinium octahydrotriborate is an ionic liquid with a melting point below -10°C, which makes it a possible injectable/pumpable hydrogen carrier. It decomposes selectively to hydrogen, in stark …
Influence Of Biopolymer Loading On The Physiochemical And Electrochemical Properties Of Inherently Conducting Polymer Biomaterials, Paul J. Molino, Peter C. Innis, Michael J. Higgins, Robert M. I Kapsa, Gordon G. Wallace
Influence Of Biopolymer Loading On The Physiochemical And Electrochemical Properties Of Inherently Conducting Polymer Biomaterials, Paul J. Molino, Peter C. Innis, Michael J. Higgins, Robert M. I Kapsa, Gordon G. Wallace
Australian Institute for Innovative Materials - Papers
The physicochemical and electrochemical properties of polypyrrole (PPy) doped with the biological dopant dextran sulphate (DS) were shown to be significantly altered as a function of varying the salt concentration (0.2, 2 or 20 mg/ml) in the polymerisation electrolyte. Films grown in the presence of 0.2 mg/ml DS generated the highest potential during galvanostatic growth, with the potential decreasing with each subsequent increase in DS concentration. The electroactivity of the polymers was similar for all three DS concentrations, with the 20 mg/ml film drawing slightly more current upon reduction in PBS. Increasing the DS concentration reduced film interfacial roughness and …
Electrochemical Synthesis Of Mesoporous Pt Nanowires With Highly Electrocatalytic Activity Toward Methanol Oxidation Reaction, Cuiling Liu, Victor Malgras, Saad Alshehri, Jung Ho Kim, Yusuke Yamauchi
Electrochemical Synthesis Of Mesoporous Pt Nanowires With Highly Electrocatalytic Activity Toward Methanol Oxidation Reaction, Cuiling Liu, Victor Malgras, Saad Alshehri, Jung Ho Kim, Yusuke Yamauchi
Australian Institute for Innovative Materials - Papers
Self-supported one-dimensional (1D) mesoporous Pt nanowires (NWs) are prepared by confining micelle assembly in channels of a polycarbonate (PC) membrane. The obtained mesoporous Pt NWs show very high electrochemical activity and excellent durability as catalysts for methanol oxidation reaction (MOR) in comparison with the commercially available Pt black (PtB) catalyst. This work demonstrates that an appropriate combination of both self-supported 1D shape and mesoporous architecture indeed improve the electrocatalytic performances which is critical for further implementation and practical applications.
A Class Of Rare Antiferromagnetic Metallic Oxides: Double Perovskite Amn(3)V(4)O(12) (A = Na+, Ca2+, And La3+) And The Site-Selective Doping Effect, Guangbiao Zhang, Yuan Xu Wang, Zhenxiang Cheng, Yuli Yan, Chengxiao Peng, Chao Wang, Shuai Dong
A Class Of Rare Antiferromagnetic Metallic Oxides: Double Perovskite Amn(3)V(4)O(12) (A = Na+, Ca2+, And La3+) And The Site-Selective Doping Effect, Guangbiao Zhang, Yuan Xu Wang, Zhenxiang Cheng, Yuli Yan, Chengxiao Peng, Chao Wang, Shuai Dong
Australian Institute for Innovative Materials - Papers
We have investigated the structural, electronic, and magnetic properties of A-site-ordered double-perovskitestructured oxides, AA'3B4O12 (A = Na, Ca, and La) with Mn and V at A' and B sites, respectively, using firstprinciple calculations based on the density functional theory. Our calculation results show that the antiferromagnetic phase is the ground state for all the compounds. By changing the A-site ions from Na+ to Ca2+ and then to La3+, the transfer of charge between Mn and O ions was changed from 1.56 to 1.55 and then to 1.50, and that between the …
Tuneable Magnetic Phase Transitions In Layered Cemn2ge2-Xsix Compounds, M F. Md Din, Jianli Wang, Zhenxiang Cheng, S X. Dou, Shane J. Kennedy, Maxim Avdeev, Stewart J. Campbell
Tuneable Magnetic Phase Transitions In Layered Cemn2ge2-Xsix Compounds, M F. Md Din, Jianli Wang, Zhenxiang Cheng, S X. Dou, Shane J. Kennedy, Maxim Avdeev, Stewart J. Campbell
Australian Institute for Innovative Materials - Papers
The structural and magnetic properties of seven CeMn2Ge2-xSix compounds with x = 0.0-2.0 have been investigated in detail. Substitution of Ge with Si leads to a monotonic decrease of both a and c along with concomitant contraction of the unit cell volume and significant modifications of the magnetic states - a crossover from ferromagnetism at room temperature for Ge-rich compounds to antiferromagnetism for Si-rich compounds. The magnetic phase diagram has been constructed over the full range of CeMn2Ge2-xSix compositions and co-existence of ferromagnetism and antiferromagnetism has been observed in CeMn …
Fabrication Of Thermoelectric Materials-Thermal Stability And Repeatability Of Achieved Efficiencies, Sima Aminorroaya-Yamini, Matthew D. Brewis, Jacob Byrnes, Rafael Santos, Andrew Manettas, Y Z. Pei
Fabrication Of Thermoelectric Materials-Thermal Stability And Repeatability Of Achieved Efficiencies, Sima Aminorroaya-Yamini, Matthew D. Brewis, Jacob Byrnes, Rafael Santos, Andrew Manettas, Y Z. Pei
Australian Institute for Innovative Materials - Papers
Metal chalcogenides have delivered the highest efficiencies among thermoelectric materials. Although the thermal stability of thermoelectric materials at device operating temperatures has been of concern, recent studies have reported the efficiencies of materials prepared with different fabrication techniques. Here, we have fabricated a p-type, multiphase lead chalcogenide compound of (PbTe)0.55(PbS)0.35(PbSe)0.1, with three common fabrication techniques of quenched, quenched-annealed and furnace cooled followed by spark plasma sintering. The compound contains PbS-rich precipitates within a PbTe-rich matrix. The achieved samples from various fabrication procedures demonstrate distinct microstructures that evolve with thermal cycling. We have shown that the thermoelectric efficiency of metastable compound …
3d Braided Yarns To Create Electrochemical Cells, Chen Zhao, Syamak Farajikhah, Caiyun Wang, Javad Foroughi, Xiaoteng Jia, Gordon G. Wallace
3d Braided Yarns To Create Electrochemical Cells, Chen Zhao, Syamak Farajikhah, Caiyun Wang, Javad Foroughi, Xiaoteng Jia, Gordon G. Wallace
Australian Institute for Innovative Materials - Papers
The demands for new configurations of electrochemical cells continue to grow and novel approaches are being enabled by the advent of new electromaterials and novel fabrication strategies. Wearable energy storage devices that can be seamlessly integrated into garments are a critical component of the wearable electronics genre. Recently, flexible yarn supercapacitors have attracted significant attention due to their ability to be integrated into fabrics, or stitched into existing textiles. Large-scale production of yarn supercapacitors using conventional manufacturing processes, however, is still a challenge. Here, we introduce the use of braiding technology to achieve a predetermined arrangement of fibre electrodes, the …
Three-Dimensional Controlled Growth Of Monodisperse Sub-50 Nm Heterogeneous Nanocrystals, Deming Liu, Xiaoxue Xu, Yi Du, Xian Qin, Yuhai Zhang, Chenshuo Ma, Shihui Wen, Wei Ren, Ewa M. Goldys, James A. Piper, S X. Dou, Xiaogang Liu, Dayong Jin
Three-Dimensional Controlled Growth Of Monodisperse Sub-50 Nm Heterogeneous Nanocrystals, Deming Liu, Xiaoxue Xu, Yi Du, Xian Qin, Yuhai Zhang, Chenshuo Ma, Shihui Wen, Wei Ren, Ewa M. Goldys, James A. Piper, S X. Dou, Xiaogang Liu, Dayong Jin
Australian Institute for Innovative Materials - Papers
The ultimate frontier in nanomaterials engineering is to realize their composition control with atomic scale precision to enable fabrication of nanoparticles with desirable size, shape and surface properties. Such control becomes even more useful when growing hybrid nanocrystals designed to integrate multiple functionalities. Here we report achieving such degree of control in a family of rare-earth-doped nanomaterials. We experimentally verify the co-existence and different roles of oleate anions (OA-) and molecules (OAH) in the crystal formation. We identify that the control over the ratio of OA- to OAH can be used to directionally inhibit, promote or etch the crystallographic facets …
Conductive Surfaces With Dynamic Switching In Response To Temperature And Salt, Alissa Hackett, Jenny Malmström, Paul J. Molino, Julien Gautrot, Hongrui Zhang, Michael J. Higgins, Gordon G. Wallace, David E. Williams, Jadranka Travas-Sejdic
Conductive Surfaces With Dynamic Switching In Response To Temperature And Salt, Alissa Hackett, Jenny Malmström, Paul J. Molino, Julien Gautrot, Hongrui Zhang, Michael J. Higgins, Gordon G. Wallace, David E. Williams, Jadranka Travas-Sejdic
Australian Institute for Innovative Materials - Papers
This work demonstrates polymer brushes grafted from conductive polymer films which display dynamic surface switching dependent on salt, temperature and electrode potential. The electroactivity presented by the conductive polymer and the responsiveness of the grafted brushes leads to an interface with multiple control parameters. Here, we demonstrate this concept by grafting of uncharged brushes of poly(ethylene glycol)methyl ether methacrylates from conducting polymer poly(3,4-ethylenedioxythiophene) (PEDOT), and observe a temperature- and salt-induced switch of brush conformation, and their effect on the electrochemistry of the material. The switching conditions can be tailored by copolymerizing monomers with different numbers of ethylene glycol units. In …
Hierarchical Heteroaggregation Of Binary Metal-Organic Gels With Tunable Porosity And Mixed Valence Metal Sites For Removal Of Dyes In Water, Asif Mahmood, Wei Xia, Nasir Mahmood, Qingfei Wang, Ruqiang Zou
Hierarchical Heteroaggregation Of Binary Metal-Organic Gels With Tunable Porosity And Mixed Valence Metal Sites For Removal Of Dyes In Water, Asif Mahmood, Wei Xia, Nasir Mahmood, Qingfei Wang, Ruqiang Zou
Australian Institute for Innovative Materials - Papers
Hierarchical heteronuclear metal-organic gels (MOGs) based on iron (Fe) and aluminium (Al) metal-organic framework (MOF) backbones bridged by tri-carboxylate ligands have firstly been synthesized by simple solvothermal method. Monometallic MOGs based on Fe or Al give homogenous monoliths, which have been tuned by introduction of heterogeneity in the system (mismatched growth). The developed gels demonstrate that surface areas, pore volumes and pore sizes can be readily tuned by optimizing heterogeneity. The work also elaborates effect of heterogeneity on size of MOG particles which increase substantially with increasing heterogeneity as well as obtaining mixed valence sites in the gels. High surface …
Trap-Assisted Transport And Non-Uniform Charge Distribution In Sulphur-Rich Pbs Colloidal Quantum Dot-Based Solar Cells With Selective Contacts, Victor Malgras, Guanran Zhang, Andrew Nattestad, Tracey M. Clarke, Attila J. Mozer, Yusuke Yamauchi, Jung Ho Kim
Trap-Assisted Transport And Non-Uniform Charge Distribution In Sulphur-Rich Pbs Colloidal Quantum Dot-Based Solar Cells With Selective Contacts, Victor Malgras, Guanran Zhang, Andrew Nattestad, Tracey M. Clarke, Attila J. Mozer, Yusuke Yamauchi, Jung Ho Kim
Australian Institute for Innovative Materials - Papers
This study reports evidences of dispersive transport in planar PbS colloidal quantum dots heterojunction-based devices as well as the effect of incorporating a MoO3 hole selective layer on the charge extraction behavior. Steady state and transient characterization techniques are employed to determine the complex recombination processes involved in such devices. The addition of a selective contact drastically improves the device efficiency up to 3.15 % (especially through the photocurrent and series resistance) and extends the overall charge lifetime by suppressing the main first-order recombination pathway observed in device without MoO3. The lifetime and mobility calculated for our sulphur-rich PbS-based devices …
Research Progress On Design Strategies, Synthesis And Performance Of Limn2o4-Based Cathodes, Fangxin Mao, Wei Dong Guo, Jianmin Ma
Research Progress On Design Strategies, Synthesis And Performance Of Limn2o4-Based Cathodes, Fangxin Mao, Wei Dong Guo, Jianmin Ma
Australian Institute for Innovative Materials - Papers
Spinel LiMn2O4 (LMO)-based composites, due to their combination of low toxicity, abundant natural resources, and excellent electrochemical performance, are regarded as promising candidate cathode materials for lithium ion batteries. Current energy storage demands are not being met with existing materials, however, because of their defects, such as fast capacity fading, low rate capability, and low specific capacity in practical applications. Manganese dissolution during electrochemical processes bears the major responsibility for capacity loss, apart from the electrolyte factor. Low electrical conductivity, low ionic diffusion efficiency, and large structural variation have adverse effects on the electrochemical performance of materials. With respect to …
Vanadium-Based Nanostructure Materials For Secondary Lithium Battery Applications, Hui Teng Tan, Xianhong Rui, Wenping Sun, Qingyu Yan, Tuti M. Lim
Vanadium-Based Nanostructure Materials For Secondary Lithium Battery Applications, Hui Teng Tan, Xianhong Rui, Wenping Sun, Qingyu Yan, Tuti M. Lim
Australian Institute for Innovative Materials - Papers
Vanadium-based materials, such as V2O5, LiV3O8, VO2(B) and Li3V2(PO4)3 are compounds that share the characteristic of intercalation chemistry. Their layered or open frameworks allow facile ion movement through the interspaces, making them promising cathodes for LIB applications. To bypass bottlenecks occurring in the electrochemical performances of vanadium-based cathodes that derive from their intrinsic low electrical conductivity and ion diffusion coefficients, nano-engineering strategies have been implemented to "create" newly emerging properties that are unattainable at the bulk solid level. Integrating this concept into vanadium-based cathodes represents a promising way to circumvent the aforementioned problems as nanostructuring offers potential improvements in electrochemical …
Coherent And Tunable Terahertz Radiation From Graphene Surface Plasmon Polarirons Excited By Cyclotron Electron Beam, Tao Zhao, Sen Gong, Min Hu, Renbin Zhong, Diwei Liu, Xiaoxing Chen, Ping Zhang, Xinran Wang, C Zhang, Peiheng Wu, Shenggang Liu
Coherent And Tunable Terahertz Radiation From Graphene Surface Plasmon Polarirons Excited By Cyclotron Electron Beam, Tao Zhao, Sen Gong, Min Hu, Renbin Zhong, Diwei Liu, Xiaoxing Chen, Ping Zhang, Xinran Wang, C Zhang, Peiheng Wu, Shenggang Liu
Australian Institute for Innovative Materials - Papers
Terahertz (THz) radiation can revolutionize modern science and technology. To this date, it remains big challenges to develop intense, coherent and tunable THz radiation sources that can cover the whole THz frequency region either by means of only electronics (both vacuum electronics and semiconductor electronics) or of only photonics (lasers, for example, quantum cascade laser). Here we present a mechanism which can overcome these difficulties in THz radiation generation. Due to the natural periodicity of 2π of both the circular cylindrical graphene structure and cyclotron electron beam (CEB), the surface plasmon polaritions (SPPs) dispersion can cross the light line of …
Two-Step Self-Assembly Of Hierarchically-Ordered Nanostructures, Qiannan Liu, Ziqi Sun, Yuhai Dou, Jung Ho Kim, S X. Dou
Two-Step Self-Assembly Of Hierarchically-Ordered Nanostructures, Qiannan Liu, Ziqi Sun, Yuhai Dou, Jung Ho Kim, S X. Dou
Australian Institute for Innovative Materials - Papers
Due to their unique size- and shape-dependent physical and chemical properties, highly hierarchically-ordered nanostructures have attracted great attention with a view to application in emerging technologies, such as novel energy generation, harvesting, and storage devices. The question of how to get controllable ensembles of nanostructures, however, still remains a challenge. This concept paper first summarizes and clarifies the concept of the two-step self-assembly approach for the synthesis of hierarchically-ordered nanostructures with complex morphology. Based on the preparation processes, two-step self-assembly can be classified into two typical types, namely, two-step self-assembly with two discontinuous processes and two-step self-assembly completed in one-pot …
Corrosion Protection Afforded By Praseodymium Conversion Film On Mg Alloy Aznd In Simulated Biological Fluid Studied By Scanning Electrochemical Microscopy, Seyed S. Jamali, Simon E. Moulton, Dennis E. Tallman, Maria Forsyth, Jan Weber, Azadehsadat Mirabedini, Gordon G. Wallace
Corrosion Protection Afforded By Praseodymium Conversion Film On Mg Alloy Aznd In Simulated Biological Fluid Studied By Scanning Electrochemical Microscopy, Seyed S. Jamali, Simon E. Moulton, Dennis E. Tallman, Maria Forsyth, Jan Weber, Azadehsadat Mirabedini, Gordon G. Wallace
Australian Institute for Innovative Materials - Papers
Surface passivation of AZNd Mg alloy with Pr(NO3)3 is studied using scanning electrochemical microscopy (SECM) in surface generation/tip collection (SG/TC) and AC modes. Corrosion protection afforded by the Pr treatment and the degradation mechanism in a simulated biological environment was examined on a local scale and compared with non-treated AZNd. SG/TC mode results revealed a drastic decrease in H2 evolution due to the Pr treatment. Mapping the local insulating characteristics using AC-SECM showed higher conductivity of the surface where H2 evolution was most favorable.
Unique Urchin-Like Ca2ge7o16 Hierarchical Hollow Microspheres As Anode Material For The Lithium Ion Battery, Dan Li, Chuanqi Feng, Hua-Kun Liu, Zaiping Guo
Unique Urchin-Like Ca2ge7o16 Hierarchical Hollow Microspheres As Anode Material For The Lithium Ion Battery, Dan Li, Chuanqi Feng, Hua-Kun Liu, Zaiping Guo
Australian Institute for Innovative Materials - Papers
Germanium is an outstanding anode material in terms of electrochemical performance, especially rate capability, but its developments are hindered by its high price because it is rare in the crust of earth, and its huge volume variation during the lithium insertion and extraction. Introducing other cheaper elements into the germanium-based material is an efficient way to dilute the high price, but normally sacrifice its electrochemical performance. By the combination of nanostructure design and cheap element (calcium) introduction, urchin-like Ca2Ge7O16 hierarchical hollow microspheres have been successfully developed in order to reduce the price and maintain the …
Enhanced Electron Lifetime Of Cdse/Cds Quantum Dot (Qd) Sensitized Solar Cells Using Znse Core-Shell Structure With Efficient Regeneration Of Quantum Dots, Rasin K. Ahmed, Long Zhao, Attila J. Mozer, Geoffrey D. Will, John M. Bell, Hongxia Wang
Enhanced Electron Lifetime Of Cdse/Cds Quantum Dot (Qd) Sensitized Solar Cells Using Znse Core-Shell Structure With Efficient Regeneration Of Quantum Dots, Rasin K. Ahmed, Long Zhao, Attila J. Mozer, Geoffrey D. Will, John M. Bell, Hongxia Wang
Australian Institute for Innovative Materials - Papers
Research on development of efficient passivation materials for high performance and stable quantum dot sensitized solar cells (QDSCs) is highly important. While ZnS is one of the most widely used passivation material in QDSCs, an alternative material based on ZnSe which was deposited on CdS/CdSe/TiO2 photoanode to form a semi-core/shell structure has been found to be more efficient in terms of reducing electron recombination in QDSCs in this work. It has been found that the solar cell efficiency was improved from 1.86% for ZnSe0 (without coating) to 3.99% using 2 layers of ZnSe coating (ZnSe2) deposited by successive ionic …
Ray Optics Behavior Of Flux Avalanche Propagation In Superconducting Films, Pavlo Mikheenko, Tom H. Johansen, Supratim Chaudhuri, I J. Maasilta, Y Galperin
Ray Optics Behavior Of Flux Avalanche Propagation In Superconducting Films, Pavlo Mikheenko, Tom H. Johansen, Supratim Chaudhuri, I J. Maasilta, Y Galperin
Australian Institute for Innovative Materials - Papers
Experimental evidence of wave properties of dendritic flux avalanches in superconducting films is reported. Using magneto-optical imaging the propagation of dendrites across boundaries between a bare NbN film and areas coated by a Cu layer was visualized, and it was found that the propagation is refracted in full quantitative agreement with Snell's law. For the studied film of 170 nm thickness and a 0.9μm thick metal layer, the refractive index was close to n=1.4. The origin of the refraction is believed to be caused by the dendrites propagating as an electromagnetic shock wave, similar to damped modes …
The Effect Of Surface Passivation On The Structure Of Sulphur-Rich Pbs Colloidal Quantum Dots For Photovoltaic Application, Victor Malgras, Andrew Nattestad, Yusuke Yamauchi, S X. Dou, Jung Ho Kim
The Effect Of Surface Passivation On The Structure Of Sulphur-Rich Pbs Colloidal Quantum Dots For Photovoltaic Application, Victor Malgras, Andrew Nattestad, Yusuke Yamauchi, S X. Dou, Jung Ho Kim
Australian Institute for Innovative Materials - Papers
The use of PbS colloidal quantum dots in photovoltaic devices is very promising because of their simple and low cost production processes and their unique properties, such as bandgap tunability and potential multiple exciton generation. Here we report the synthesis of PbS nanocrystals used for application in solar cells. The sulphur-rich nature of their surface appears to be caused by the exposure to ambient conditions. The use of methanol as medium during the ligand exchange process has a crucial role in the removal of native oleate ligands. Without proper ligand exchange, the unpassivated surface is subject to ambient hydroxylation leading …
Soft, Flexible Freestanding Neural Stimulation And Recording Electrodes Fabricated From Reduced Graphene Oxide, Nicholas V. Apollo, Matias I. Maturana, Wei Tong, David A. X Nayagam, Mohit N. Shivdasani, Javad Foroughi, Gordon G. Wallace, Steven Prawer, Michael R. Ibbotson, David J. Garrett
Soft, Flexible Freestanding Neural Stimulation And Recording Electrodes Fabricated From Reduced Graphene Oxide, Nicholas V. Apollo, Matias I. Maturana, Wei Tong, David A. X Nayagam, Mohit N. Shivdasani, Javad Foroughi, Gordon G. Wallace, Steven Prawer, Michael R. Ibbotson, David J. Garrett
Australian Institute for Innovative Materials - Papers
There is an urgent need for conductive neural interfacing materials that exhibit mechanically compliant properties, while also retaining high strength and durability under physiological conditions. Currently, implantable electrode systems designed to stimulate and record neural activity are composed of rigid materials such as crystalline silicon and noble metals. While these materials are strong and chemically stable, their intrinsic stiffness and density induce glial scarring and eventual loss of electrode function in vivo. Conductive composites, such as polymers and hydrogels, have excellent electrochemical and mechanical properties, but are electrodeposited onto rigid and dense metallic substrates. In the work described here, strong …
Dual Yolk-Shell Structure Of Carbon And Silica-Coated Silicon For High-Performance Lithium-Ion Batteries, L Y. Yang, H Z. Li, Jun Liu, Ziqi Sun, S S. Tang, M Lei
Dual Yolk-Shell Structure Of Carbon And Silica-Coated Silicon For High-Performance Lithium-Ion Batteries, L Y. Yang, H Z. Li, Jun Liu, Ziqi Sun, S S. Tang, M Lei
Australian Institute for Innovative Materials - Papers
Silicon batteries have attracted much attention in recent years due to their high theoretical capacity, although a rapid capacity fade is normally observed, attributed mainly to volume expansion during lithiation. Here, we report for the first time successful synthesis of Si/void/SiO2/void/C nanostructures. The synthesis strategy only involves selective etching of SiO2 in Si/SiO2/C structures with hydrofluoric acid solution. Compared with reported results, such novel structures include a hard SiO2-coated layer, a conductive carbon-coated layer, and two internal void spaces. In the structures, the carbon can enhance conductivity, the SiO2 layer has mechanically …
Sodium-Difluoro(Oxalato)Borate (Nadfob): A New Electrolyte Salt For Na-Ion Batteries, Juner Chen, Zhenguo Huang, Caiyun Wang, Spencer H. Porter, Baofeng Wang, Wilford Lie, Hua-Kun Liu
Sodium-Difluoro(Oxalato)Borate (Nadfob): A New Electrolyte Salt For Na-Ion Batteries, Juner Chen, Zhenguo Huang, Caiyun Wang, Spencer H. Porter, Baofeng Wang, Wilford Lie, Hua-Kun Liu
Australian Institute for Innovative Materials - Papers
A new electrolyte salt, sodium-difluoro(oxalato)borate (NaDFOB), was synthesized and studied, which enables excellent reversible capacity and high rate capability when used in Na/Na0.44MnO2 half cells. NaDFOB has excellent compatibility with various common solvents used in Na-ion batteries, in strong contrast to the solvent dependent performances of NaClO4 and NaPF6. In addition, NaDFOB possesses good stability and generates no toxic or dangerous products when exposed to air and water. All these properties demonstrate that NaDFOB could be used to prepare high performance electrolytes for emerging Na-ion batteries.
Sodium And Lithium Storage Properties Of Spray-Dried Molybdenum Disulfide-Graphene Hierarchical Microspheres, Sujith Kalluri, Kuok Hau Seng, Zaiping Guo, Aijun Du, Konstantin K. Konstantinov, Hua-Kun Liu, S X. Dou
Sodium And Lithium Storage Properties Of Spray-Dried Molybdenum Disulfide-Graphene Hierarchical Microspheres, Sujith Kalluri, Kuok Hau Seng, Zaiping Guo, Aijun Du, Konstantin K. Konstantinov, Hua-Kun Liu, S X. Dou
Australian Institute for Innovative Materials - Papers
Developing nano/micro-structures which can effectively upgrade the intriguing properties of electrode materials for energy storage devices is always a key research topic. Ultrathin nanosheets were proved to be one of the potential nanostructures due to their high specific surface area, good active contact areas and porous channels. Herein, we report a unique hierarchical micro-spherical morphology of well-stacked and completely miscible molybdenum disulfide (MoS2) nanosheets and graphene sheets, were successfully synthesized via a simple and industrial scale spray-drying technique to take the advantages of both MoS2 and graphene in terms of their high practical capacity values and high …
Observation Of Topological Transition Of Fermi Surface From A Spindle Torus To A Torus In Bulk Rashba Spin-Split Bitecl, Feixiang Xiang, Xiaolin Wang, Menno Veldhorst, S X. Dou, Michael S. Fuhrer
Observation Of Topological Transition Of Fermi Surface From A Spindle Torus To A Torus In Bulk Rashba Spin-Split Bitecl, Feixiang Xiang, Xiaolin Wang, Menno Veldhorst, S X. Dou, Michael S. Fuhrer
Australian Institute for Innovative Materials - Papers
The recently observed large Rashba-type spin splitting in the BiTeX(X=I,Br,Cl) bulk states enables observation of the transition in Fermi surface topology from spindle torus to torus with varying the carrier density and offers an ideal platform for achieving practical spintronic applications and realizing nontrivial phenomena such as topological superconductivity and Majorana fermions. Here we use Shubnikov-de Haas oscillations to investigate the electronic structure of the bulk conduction band of BiTeCl single crystals with different carrier densities. We observe the topological transition of the Fermi surface (FS) from a spindle torus to a torus. The Landau-level fan diagram reveals the expected …
Free-Standing Composite Hydrogel Films For Superior Volumetric Capacitance, Mahmoud Moussa, Zhiheng Zhao, Maher F. El-Kady, Hua-Kun Liu, Andrew Michelmore, Nobuyuki Kawashima, Peter Majewski, Jun Ma
Free-Standing Composite Hydrogel Films For Superior Volumetric Capacitance, Mahmoud Moussa, Zhiheng Zhao, Maher F. El-Kady, Hua-Kun Liu, Andrew Michelmore, Nobuyuki Kawashima, Peter Majewski, Jun Ma
Australian Institute for Innovative Materials - Papers
High volumetric capacitance is vital for the development of wearable and portable energy storage devices. We herein introduce a novel simple route for the fabrication of a highly porous, binder-free and free-standing polyaniline/reduced graphene oxide composite hydrogel (PANi/graphene hydrogel) as an electrode with a packing density of 1.02 g cm-3. PANi played critical roles in gelation, which include reduction, crosslinking, creation of pseudocapacitance and as a spacer preventing graphene sheets from stacking. The composite hydrogel film delivered a volumetric capacitance of 225.42 F cm-3 with a two-electrode supercapacitor configuration, which was enhanced to 592.96 F cm-3 …
Characterisation Of Torsional Actuation In Highly Twisted Yarns And Fibres, Shazed Aziz, Sina Naficy, Javad Foroughi, Hugh Ralph Brown, Geoffrey M. Spinks
Characterisation Of Torsional Actuation In Highly Twisted Yarns And Fibres, Shazed Aziz, Sina Naficy, Javad Foroughi, Hugh Ralph Brown, Geoffrey M. Spinks
Australian Institute for Innovative Materials - Papers
Highly twisted oriented polymer fibres and carbon nanotube yarns show large scale torsional actuation from volume expansion that can be induced, for example, thermally or by electrochemical charging. When formed into spring-like coils, the torsional actuation within the fibre or yarn generates powerful tensile actuation per muscle weight. For further development of these coil actuators and for the practical application of torsional actuators, it is important to standardise methods for characterising both the torsional stroke (rotation) and torque generated. By analogy with tensile actuators, we here introduce a method to measure both the free stroke and blocked torque in a …
Bio-Interface Of Conducting Polymer-Based Materials For Neuroregeneration, Bo Weng, Jianglin Diao, Qun Xu, Yuqing Liu, Changming Li, Ailing Ding, Jun Chen
Bio-Interface Of Conducting Polymer-Based Materials For Neuroregeneration, Bo Weng, Jianglin Diao, Qun Xu, Yuqing Liu, Changming Li, Ailing Ding, Jun Chen
Australian Institute for Innovative Materials - Papers
Nerve system diseases like Parkinson's disease, Huntington's disease, Alzheimer's disease, etc. seriously affect thousands of patients' lives every year, making them suffer from pains and inconvenience. Recently, bio-interfaces between neural cells/tissues and polymer based biomaterials attracted worldwide attention due to the ability of polymer based biomaterials to serve as nerve conduits, drug carriers and neurites guidance platform in neuroregeneration. The role that bio-interface played and the way it interacted with neural tissues and cells have been thoroughly investigated by the researchers. In this paper we mainly focus on reviewing the bio-interface between nerve tissues/cells and advanced functional biocompatible polymers, such …
Super-Paramagnetic Particles Chemically Bound To Luminescent Diamond: Single Nano-Crystals Probed With Optically Detected Magnetic Resonance, Taras Plakhotnik, Haroon Aman, Shaohua Zhang, Zhen Li
Super-Paramagnetic Particles Chemically Bound To Luminescent Diamond: Single Nano-Crystals Probed With Optically Detected Magnetic Resonance, Taras Plakhotnik, Haroon Aman, Shaohua Zhang, Zhen Li
Australian Institute for Innovative Materials - Papers
We have synthesized novel composite particles made of single-domain nanomagnets chemically bound to nanocrystals of diamond. Optically detected magnetic resonance spectra of nitrogen-vacancy centers in diamond allowed us to estimate the magnetic field of the nanomagnets and to observe the saturation of their magnetization when an external field of a few tens of mT has been applied. The saturation effect is in agreement with the size of the domains measured using transmission electron microscopy and a simple model of magnetization.
Functionalised Inherently Conducting Polymers As Low Biofouling Materials, Binbin Zhang, Alexander Nagle, Gordon G. Wallace, Timothy W. Hanks, Paul J. Molino
Functionalised Inherently Conducting Polymers As Low Biofouling Materials, Binbin Zhang, Alexander Nagle, Gordon G. Wallace, Timothy W. Hanks, Paul J. Molino
Australian Institute for Innovative Materials - Papers
Diatoms are a major component of microbial biofouling layers that develop on man-made surfaces placed in aquatic environments, resulting in significant economic and environmental impacts. This paper describes surface functionalisation of the inherently conducting polymers (ICPs) polypyrrole (PPy) and polyaniline (PANI) with poly(ethylene glycol) (PEG) and their efficacy as fouling resistant materials. Their ability to resist interactions with the model protein bovine serum albumin (BSA) was tested using a quartz crystal microbalance with dissipation monitoring (QCM-D). The capacity of the ICP-PEG materials to prevent settlement and colonisation of the fouling diatom Amphora coffeaeformis (Cleve) was also assayed. Variations were demonstrated …