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Articles 421 - 450 of 4868

Full-Text Articles in Physical Sciences and Mathematics

Weavable Asymmetric Carbon Nanotube Yarn Supercapacitor For Electronic Textiles, Changsoon Choi, Jong Park, Keon Jung Kim, Duck Lee, Monica Jung De Andrade, Shi Hyeong Kim, Sanjeev Gambhir, Geoffrey M. Spinks, Ray H. Baughman, Seon Jeong Kim Jan 2018

Weavable Asymmetric Carbon Nanotube Yarn Supercapacitor For Electronic Textiles, Changsoon Choi, Jong Park, Keon Jung Kim, Duck Lee, Monica Jung De Andrade, Shi Hyeong Kim, Sanjeev Gambhir, Geoffrey M. Spinks, Ray H. Baughman, Seon Jeong Kim

Australian Institute for Innovative Materials - Papers

Asymmetric supercapacitors are receiving much research interests due to their wide operating potential window and high energy density. In this study, we report the fabrication of asymmetrically configured yarn based supercapacitor by using liquid-state biscrolling technology. High loading amounts of reduced graphene oxide anode guest (90.1 wt%) and MnO 2 cathode guest (70 wt%) materials were successfully embedded into carbon nanotube yarn host electrodes. The resulting asymmetric yarn supercapacitor coated by gel based organic electrolyte (PVDF-HFP-TEA·BF 4 ) exhibited wider potential window (up to 3.5 V) and resulting high energy density (43 μW h cm -2 ). Moreover, the yarn …

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Remarkable Enhancement In Sodium-Ion Kinetics Of Nafe2(Cn)(6) By Chemical Bonding With Graphene, Weijie Li, Chao Han, Qingbing Xia, Kai Zhang, Shulei Chou, Yong-Mook Kang, Jiazhao Wang, Hua-Kun Liu, Shi Xue Dou Jan 2018

Remarkable Enhancement In Sodium-Ion Kinetics Of Nafe2(Cn)(6) By Chemical Bonding With Graphene, Weijie Li, Chao Han, Qingbing Xia, Kai Zhang, Shulei Chou, Yong-Mook Kang, Jiazhao Wang, Hua-Kun Liu, Shi Xue Dou

Australian Institute for Innovative Materials - Papers

Hexacyanoferrate (Prussian blue, PB)/reduced graphene oxide (PB-RGO) composites with a synergistic structure (graphene/PB/graphene) and a chemical bond are fabricated using a facile one-step method that does not require any external chemical reducing agent. Here, Na4Fe(CN)6 is decomposed in an acidic solution to produce Fe2+ ions, which anchor onto the electronegative graphene oxide (GO) layers by electrostatic interaction and then reduce the GO. The formation of an FeOC chemical bond in the composite results in an excellent rate capability of the PB-RGO composite at room temperature, delivering capacities of 78.1, 68.9, and 46.0 mAh g−1 even at the high rates of …

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Structural Design Of Anode Materials For Sodium-Ion Batteries, Wanlin Wang, Weijie Li, Shun Wang, Zongcheng Miao, Hua-Kun Liu, Shulei Chou Jan 2018

Structural Design Of Anode Materials For Sodium-Ion Batteries, Wanlin Wang, Weijie Li, Shun Wang, Zongcheng Miao, Hua-Kun Liu, Shulei Chou

Australian Institute for Innovative Materials - Papers

With the high consumption and increasing price of lithium resources, sodium ion batteries (SIBs) have been considered as attractive and promising potential alternatives to lithium ion batteries, owing to the abundance and low cost of sodium resources, and the similar electrochemical properties of sodium to lithium. Nevertheless, the lower energy density and limited cycling life of SIBs are still the main challenges impeding their wide application. Tremendous work has been done on anode materials for SIBs, and rational structural design is considered as an effective way to enhance their electrochemical performance. In this review, different types of anode materials for …

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Three-Dimensional Macroporous Graphitic Carbon For Supercapacitor Application, Rahul R. Salunkhe, Jie Wang, Azhar Alowasheeir, Jianjian Lin, Victor Malgras, Yoshio Bando, Mohamed B. Zakaria, Abdulmohsen Alshehri, Jeonghun Kim, Yusuke Yamauchi, Kevin C.-W Wu Jan 2018

Three-Dimensional Macroporous Graphitic Carbon For Supercapacitor Application, Rahul R. Salunkhe, Jie Wang, Azhar Alowasheeir, Jianjian Lin, Victor Malgras, Yoshio Bando, Mohamed B. Zakaria, Abdulmohsen Alshehri, Jeonghun Kim, Yusuke Yamauchi, Kevin C.-W Wu

Australian Institute for Innovative Materials - Papers

Two-dimensional (2D) graphene materials have attracted great interest as promising electrode materials in supercapacitors due to their high electrical conductivity derived from sp 2 -cabon network. These 2D layered materials, however, tend to stack with each other, which largely decreases the surface area. Here we report the design of highly graphitic macroporous carbon with large surface area suitable for supercapacitor applications. When benchmarked with other carbon materials, such as amorphous macroporous carbon, activated carbon, graphite or exfoliated graphene oxides, our graphitic macroporous carbon show superior capacitance.

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Synergistically Enhanced Interfacial Interaction To Polysulfide Via N,O Dual-Doped Highly Porous Carbon Microrods For Advanced Lithium-Sulfur Batteries, Nana Wang, Zhongfei Xu, Xun Xu, Ting Liao, Bin Tang, Zhongchao Bai, Shi Xue Dou Jan 2018

Synergistically Enhanced Interfacial Interaction To Polysulfide Via N,O Dual-Doped Highly Porous Carbon Microrods For Advanced Lithium-Sulfur Batteries, Nana Wang, Zhongfei Xu, Xun Xu, Ting Liao, Bin Tang, Zhongchao Bai, Shi Xue Dou

Australian Institute for Innovative Materials - Papers

Lithium-sulfur (Li-S) batteries have received tremendous attention because of their extremely high theoretical capacity (1672 mA h g -1 ) and energy density (2600 W h kg -1 ). Nevertheless, the commercialization of Li-S batteries has been blocked by the shuttle effect of lithium polysulfide intermediates, the insulating nature of sulfur, and the volume expansion during cycling. Here, hierarchical porous N,O dual-doped carbon microrods (NOCMs) were developed as sulfur host materials with a large pore volume (1.5 cm 3 g -1 ) and a high surface area (1147 m 2 g -1 ). The highly porous structure of the NOCMs …

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Thickness Dependence Of Dendritic Flux Avalanches In Yba2cu3o7-Xfilms, E Baruch-El, M Baziljevich, Tom H. Johansen, A Shaulov, Y Yeshurun Jan 2018

Thickness Dependence Of Dendritic Flux Avalanches In Yba2cu3o7-Xfilms, E Baruch-El, M Baziljevich, Tom H. Johansen, A Shaulov, Y Yeshurun

Australian Institute for Innovative Materials - Papers

By implementing a unique magneto-optical system with ultrafast magnetic-field ramping-rate capability (up to 3 kT/s), we have been able to routinely generate and image dendritic flux instabilities in YBa 2 Cu 3 O 7-x films. In the present work we study the effect of the film thickness on the dendritic instability. Dendritic avalanches in 50-600 nm thick films were magneto-optically imaged at 7 K, after ramping the magnetic field from zero to 60 mT at different rates. The data reveal a remarkable change in flux morphologies between the thin and the thicker films. While the former (50-250 nm) display well-developed …

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Si Nanocrystal-Embedded Sioxnanofoils: Two-Dimensional Nanotechnology-Enabled High Performance Li Storage Materials, Hyundong Yoo, Eunjun Park, Juhye Bae, Jaewoo Lee, Dong Jae Chung, Yong Jo, Min-Sik Park, Jung Ho Kim, Shi Xue Dou, Young-Jun Kim, Hansu Kim Jan 2018

Si Nanocrystal-Embedded Sioxnanofoils: Two-Dimensional Nanotechnology-Enabled High Performance Li Storage Materials, Hyundong Yoo, Eunjun Park, Juhye Bae, Jaewoo Lee, Dong Jae Chung, Yong Jo, Min-Sik Park, Jung Ho Kim, Shi Xue Dou, Young-Jun Kim, Hansu Kim

Australian Institute for Innovative Materials - Papers

Silicon (Si) based materials are highly desirable to replace currently used graphite anode for lithium ion batteries. Nevertheless, its usage is still a big challenge due to poor battery performance and scale-up issue. In addition, two-dimensional (2D) architectures, which remain unresolved so far, would give them more interesting and unexpected properties. Herein, we report a facile, cost-effective, and scalable approach to synthesize Si nanocrystals embedded 2D SiO x nanofoils for next-generation lithium ion batteries through a solution-evaporation-induced interfacial sol-gel reaction of hydrogen silsesquioxane (HSiO 1.5 , HSQ). The unique nature of the thus-prepared centimeter scale 2D nanofoil with a large …

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Creating Fast Ion Conducting Composites Via In-Situ Introduction Of Titanium As Oxygen Getter, Wenchao Zhang, Jianfeng Mao, Wei Kong Pang, Xing Wang, Zaiping Guo Jan 2018

Creating Fast Ion Conducting Composites Via In-Situ Introduction Of Titanium As Oxygen Getter, Wenchao Zhang, Jianfeng Mao, Wei Kong Pang, Xing Wang, Zaiping Guo

Australian Institute for Innovative Materials - Papers

Metal-ion batteries are promising for large-scale energy storage. Their potential commercialization not only depends on their superior electrochemical performance, but also on the large-scale synthesis cost of electrode materials. In the conventional industrial technology for producing non-oxides, argon protection is required to avoid oxidation, leading to additional costs and extra processing. We demonstrate, without protection gas, that ball milling in air with a small amount of Ti additive can be a cost-effective approach for preparing high-performance alloy anodes. Ti consumes the oxygen, forming TiO 2 ( < 10 nm) in situ with high ionic conductivity, while also preventing oxidation and sustaining the electrical conductivity of carbon. This strategy effectively promotes the rate capability (61% capacity retention from 60 to 3000 mA g −1 ) of SnSb/carbon-nanotube anode (over 204% better than without Ti additive).

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Frequency And Wavenumber Selective Excitation Of Spin Waves Through Coherent Energy Transfer From Elastic Waves, Yusuke Hashimoto, Davide Bossini, Tom H. Johansen, Eiji Saitoh, Andrei Kirilyuk, Theo Rasing Jan 2018

Frequency And Wavenumber Selective Excitation Of Spin Waves Through Coherent Energy Transfer From Elastic Waves, Yusuke Hashimoto, Davide Bossini, Tom H. Johansen, Eiji Saitoh, Andrei Kirilyuk, Theo Rasing

Australian Institute for Innovative Materials - Papers

Using spin-wave tomography (SWaT), we have investigated the excitation and the propagation dynamics of optically excited magnetoelastic waves, i.e., hybridized modes of spin waves and elastic waves, in a garnet film. By using time-resolved SWaT, we reveal the excitation dynamics of magnetoelastic waves through coherent-energy transfer between optically excited pure-elastic waves and spin waves via magnetoelastic coupling. This process realizes frequency and wavenumber selective excitation of spin waves at the crossing of the dispersion relations of spin waves and elastic waves. Finally, we demonstrate that the excitation mechanism of the optically excited pure-elastic waves, which are the source of the …

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Three-Dimensional Printing And Cell Therapy For Wound Repair, Sylvia Van Kogelenberg, Zhilian Yue, Jeremy Dinoro, Christopher Baker, Gordon G. Wallace Jan 2018

Three-Dimensional Printing And Cell Therapy For Wound Repair, Sylvia Van Kogelenberg, Zhilian Yue, Jeremy Dinoro, Christopher Baker, Gordon G. Wallace

Australian Institute for Innovative Materials - Papers

Significance: Skin tissue damage is a major challenge and a burden on healthcare systems, from burns and other trauma to diabetes and vascular disease. Although the biological complexities are relatively well understood, appropriate repair mechanisms are scarce. Three-dimensional bioprinting is a layer-based approach to regenerative medicine, whereby cells and cell-based materials can be dispensed in fine spatial arrangements to mimic native tissue. Recent Advances: Various bioprinting techniques have been employed in wound repair-based skin tissue engineering, from laser-induced forward transfer to extrusion-based methods, and with the investigation of the benefits and shortcomings of each, with emphasis on biological compatibility and …

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Carbon Hollow Nanobubbles On Porous Carbon Nanofibers: An Ideal Host For High-Performance Sodium-Sulfur Batteries And Hydrogen Storage, Guanglin Xia, Lijun Zhang, Xiaowei Chen, Yuqin Huang, Dalin Sun, Fang Fang, Zaiping Guo, Xuebin Yu Jan 2018

Carbon Hollow Nanobubbles On Porous Carbon Nanofibers: An Ideal Host For High-Performance Sodium-Sulfur Batteries And Hydrogen Storage, Guanglin Xia, Lijun Zhang, Xiaowei Chen, Yuqin Huang, Dalin Sun, Fang Fang, Zaiping Guo, Xuebin Yu

Australian Institute for Innovative Materials - Papers

One-dimensional (1D) carbon nanostructures have been intensively investigated because of their intriguing features and great potential for practical application in various fields. This paper reports the controllable fabrication of carbon hollow nanobubbles on porous carbon nanofibers (CHNBs@PCNFs) through a general electrospinning strategy, with metal azides serving as both a bubbling and a porogen reagent. The strong repulsive forces resulting from the intense release of N 2 from the decomposition of metal azides upon carbonization leads to the uniform formation of porous carbon nanofibers (PCNFs), which could be facile tuned by heating rates and the amount of the bubbling reagent, simultaneously …

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Measuring The Effective Area And Charge Density Of Platinum Electrodes For Bionic Devices, Alexander R. Harris, C Newbold, P Carter, R Cowan, Gordon G. Wallace Jan 2018

Measuring The Effective Area And Charge Density Of Platinum Electrodes For Bionic Devices, Alexander R. Harris, C Newbold, P Carter, R Cowan, Gordon G. Wallace

Australian Institute for Innovative Materials - Papers

Objective. Neural stimulation is usually performed with fairly large platinum electrodes. Smaller electrodes increase the applied charge density, potentially damaging the electrode. Greater understanding of the charge injection mechanism is required for safe neural stimulation. Approach. The charge injection mechanism and charge injection capacity were measured by cyclic voltammetry. Electrodes were cleaned mechanically or by potential cycling in acidic solutions. The effective electrode area was measured by hydrogen adsorption or reduction of Ru(NH3) 3+ 6 . Main results. The water window and safe potential window were affected by changes to electrolyte, electrode size, polishing method and oxygen concentration. Capacitance and …

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Coercivity Degradation Caused By Inhomogeneous Grain Boundaries In Sintered Nd-Fe-B Permanent Magnets, Hansheng Chen, Fan Yun, Jiangtao Qu, Yingfei Li, Zhenxiang Cheng, Ruhao Fang, Zhixiao Ye, Simon Peter Ringer, Rongkun Zheng Jan 2018

Coercivity Degradation Caused By Inhomogeneous Grain Boundaries In Sintered Nd-Fe-B Permanent Magnets, Hansheng Chen, Fan Yun, Jiangtao Qu, Yingfei Li, Zhenxiang Cheng, Ruhao Fang, Zhixiao Ye, Simon Peter Ringer, Rongkun Zheng

Australian Institute for Innovative Materials - Papers

Quantitative correlation between intrinsic coercivity and grain boundaries in three dimensions is critical to further improve the performance of sintered Nd-Fe-B permanent magnets. Here, we quantitatively reveal the local composition variation across and especially along grain boundaries using the powerful atomic-scale analysis technique known as atom probe tomography. We also estimate the saturation magnetization, magnetocrystalline anisotropy constant, and exchange stiffness of the grain boundaries on the basis of the experimentally determined structure and composition. Finally, using micromagnetic simulations, we quantify the intrinsic coercivity degradation caused by inhomogeneous grain boundaries. This approach can be applied to other magnetic materials for the …

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In Situ Construction Of Yolk-Shell Zinc Cobaltite With Uniform Carbon Doping For High Performance Asymmetric Supercapacitors, Xiaoya Chang, Lei Zang, Song Liu, Mengying Wang, Huinan Guo, Caiyun Wang, Yijing Wang Jan 2018

In Situ Construction Of Yolk-Shell Zinc Cobaltite With Uniform Carbon Doping For High Performance Asymmetric Supercapacitors, Xiaoya Chang, Lei Zang, Song Liu, Mengying Wang, Huinan Guo, Caiyun Wang, Yijing Wang

Australian Institute for Innovative Materials - Papers

Zinc cobaltite (ZnCo 2 O 4 ) is a promising material for supercapacitors with appreciable theoretical capacitance. However, it suffers from poor electrical conductivity and large volume expansion during charge-discharge processes. In this work, a novel material, ZnCo 2 O 4 /C microspheres in a yolk-shell structure, is fabricated by a facile refluxing process in combination with a calcination treatment. Carbon is in situ formed via the pyrolysis of polyvinyl pyrrolidone and uniformly dispersed both in the core and the shell. Benefiting from the unique structure and the synergistic effect of the two components, this material exhibits remarkable electrochemical properties …

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High Performance Mno@C Microcages With A Hierarchical Structure And Tunable Carbon Shell For Efficient And Durable Lithium Storage, Chuanxin Hou, Zhixin Tai, Lanling Zhao, Yanjie Zhai, Yue Hou, Yuqi Fan, Feng Dang, Jun Wang, Hua-Kun Liu Jan 2018

High Performance Mno@C Microcages With A Hierarchical Structure And Tunable Carbon Shell For Efficient And Durable Lithium Storage, Chuanxin Hou, Zhixin Tai, Lanling Zhao, Yanjie Zhai, Yue Hou, Yuqi Fan, Feng Dang, Jun Wang, Hua-Kun Liu

Australian Institute for Innovative Materials - Papers

A MnO@C microcage with a multi-structure and tunable carbon shell was fabricated through a facile bio-inspired synthesis strategy for highly reversible Li storage. Micrometer-sized MnO unit aggregates were covered with a porous carbon shell outside with a thickness of about 0.2 μm, and a graphene-analogous carbon network inside the MnO@C microcages. The carbon shell could be tunable by a graphene-base shell. The unique double-carbon-coating structure of the MnO@C microcages enabled realizing the high Li-storage performance of the MnO particles with a micrometer size. The electrode containing the MnO@C microcages delivered a high reversible capacity of 1450.5 mA h g -1 …

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Recent Progress On Liquid Metals And Their Applications, Guyue Bo, Long Ren, Xun Xu, Yi Du, Shi Xue Dou Jan 2018

Recent Progress On Liquid Metals And Their Applications, Guyue Bo, Long Ren, Xun Xu, Yi Du, Shi Xue Dou

Australian Institute for Innovative Materials - Papers

Gallium-based liquid metals show excellent thermal and electrical conductivities with low viscosity and non-toxicity. Their melting points are either lower than or close to room temperature, which endows them with additional advantages in comparison to the solid metals; for example, they are flexible, stretchable and reformable at room temperature. Recently, great improvements have been achieved in developing multifunctional devices by using Ga-based liquid metals, including actuators, flexible circuits, bio-devices and self-healing superconductors. Here, we review recent research progress on Gallium-based liquid metals, especially on the applications aspects. These applications are mainly based on the unique properties of liquid metals, including …

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Ultra-Small Nanocluster Mediated Synthesis Of Nd3+-Doped Core-Shell Nanocrystals With Emission In The Second Near-Infrared Window For Multimodal Imaging Of Tumor Vasculature, Feng Ren, Lihua Ding, Hanghang Liu, Qian Huang, Hao Zhang, Lijuan Zhang, Jianfeng Zeng, Qiao Sun, Zhen Li, Mingyuan Gao Jan 2018

Ultra-Small Nanocluster Mediated Synthesis Of Nd3+-Doped Core-Shell Nanocrystals With Emission In The Second Near-Infrared Window For Multimodal Imaging Of Tumor Vasculature, Feng Ren, Lihua Ding, Hanghang Liu, Qian Huang, Hao Zhang, Lijuan Zhang, Jianfeng Zeng, Qiao Sun, Zhen Li, Mingyuan Gao

Australian Institute for Innovative Materials - Papers

In-vivo intravital short wavelength infrared (SWIR, 1000-2300 nm) fluorescence imaging has attracted considerable attention in the imaging of tumor vasculature due to its low background, high sensitivity, and deep penetration. It can noninvasively provide dynamic feedback on the tumorigenesis, growth, necrosis and metastasis. Herein, monodisperse Nd3+-doped core-shell downconversion luminescent nanocrystals with strong emission in the second near-infrared (NIR II) window, strong temperature-dependent paramagnetism and fast attenuation to X-rays were prepared from ultra-small nanoclusters. The use of nanoclusters resulted in very uniform bright nanocrystals with a relative quantum yield comparable to the standard dye IR-26. These bright NIR nanocrystals were modified …

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Soft-Templated Synthesis Of Mesoporous Nickel Oxide Using Poly(Styrene-Block-Acrylic Acid-Block-Ethylene Glycol) Block Copolymers, Hamzeh Qutaish, Shunsuke Tanaka, Yusuf Valentino Kaneti, Jianjian Lin, Yoshio Bando, Abdulmohsen Alshehri, Shin-Ichi Yusa, Yusuke Yamauchi, Md. Shahriar Al Hossain, Jeonghun Kim Jan 2018

Soft-Templated Synthesis Of Mesoporous Nickel Oxide Using Poly(Styrene-Block-Acrylic Acid-Block-Ethylene Glycol) Block Copolymers, Hamzeh Qutaish, Shunsuke Tanaka, Yusuf Valentino Kaneti, Jianjian Lin, Yoshio Bando, Abdulmohsen Alshehri, Shin-Ichi Yusa, Yusuke Yamauchi, Md. Shahriar Al Hossain, Jeonghun Kim

Australian Institute for Innovative Materials - Papers

In this work, we report the soft-templated preparation of mesoporous nickel oxide using an asymmetric poly(styrene-block-acrylic acid-block-ethylene glycol) (PS-b-PAA-b-PEG) triblock copolymer. This block copolymer forms a micelle consisting of a PS core, a PAA shell and a PEG corona in aqueous solutions, which can serve as a soft template. Specifically, the PS block forms the core of the micelles on the basis of its lower solubility in water. The anionic PAA block interacts with the cationic Ni 2+ ions present in the solution to generate the shell. The PEG block forms the corona of the micelles and stabilizes the micelles …

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S-P Orbital Hybridization: A Strategy For Developing Efficient Photocatalysts With High Carrier Mobility, Zhongfei Xu, Kang Xu, Haifeng Feng, Yi Du, Weichang Hao Jan 2018

S-P Orbital Hybridization: A Strategy For Developing Efficient Photocatalysts With High Carrier Mobility, Zhongfei Xu, Kang Xu, Haifeng Feng, Yi Du, Weichang Hao

Australian Institute for Innovative Materials - Papers

Photocatalysis has not only invigorated the field of energy conversion materials, but also is leading to bright prospects for application in the environmental purification field [1]. Akira Fujishima and Kenichi Honda [2] first reported photocatalytic water splitting on a TiO2 semiconductor electrode under ultraviolet (UV) light in 1972. In semiconductor photocatalysts, electrons are excited from valence band maximum (VBM) to conduction band minimum (CBM) under light irradiation, and then trigger the photocatalytic process [3]. Considering solar-light-driven photocatalysis, semiconductor photocatalysts should possess a narrow band gap and appropriate band positions [4]. It was also found that photoinduced charge generation, separation, and …

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Harvesting Electrical Energy From Torsional Thermal Actuation Driven By Natural Convection, Shi Hyeong Kim, Hyeon Jun Sim, Jae Hyeon, Dongseok Suh, Geoffrey M. Spinks, Ray H. Baughman, Seon Jeong Kim Jan 2018

Harvesting Electrical Energy From Torsional Thermal Actuation Driven By Natural Convection, Shi Hyeong Kim, Hyeon Jun Sim, Jae Hyeon, Dongseok Suh, Geoffrey M. Spinks, Ray H. Baughman, Seon Jeong Kim

Australian Institute for Innovative Materials - Papers

The development of practical, cost-efective systems for the conversion of low-grade waste heat to electrical energy is an important area of renewable energy research. We here demonstrate a thermal energy harvester that is driven by the small temperature fuctuations provided by natural convection. This harvester uses coiled yarn artifcial muscles, comprising well-aligned shape memory polyurethane (SMPU) microfbers, to convert thermal energy to torsional mechanical energy, which is then electromagnetically converted to electrical energy. Temperature fuctuations in a yarn muscle, having a maximum hot-to-cold temperature diference of about 13°C, were used to spin a magnetic rotor to a peak torsional rotation …

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Hierarchical Porous Pani/Mil-101 Nanocomposites Based Solid-State Flexible Supercapacitor, Qian Wang, Liang Shao, Zhonglei Ma, Juanjuan Xu, Ying Li, Caiyun Wang Jan 2018

Hierarchical Porous Pani/Mil-101 Nanocomposites Based Solid-State Flexible Supercapacitor, Qian Wang, Liang Shao, Zhonglei Ma, Juanjuan Xu, Ying Li, Caiyun Wang

Australian Institute for Innovative Materials - Papers

Metal-Organic Frameworks (MOFs) have attracted increasing attention in the field of energy storage owing to their high porosity, high specific surface area, high charge storage. However, the poor conductivity in most MOFs largely hinders their electrical properties. In this work, we developed an effective strategy to grow the conductive polyaniline (PANI) inside the pores of MIL-101 (labeled as PANI/MIL-101) to form a fixed interpenetrating network structure. The electron-rich imine group in PANI is chelated with the coordinatively unsaturated metal sites (CUS) in MIL-101 to form a relatively strong bonded complex and through other synergistic effects to enhance the conductivity and …

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Electrical Stimulation With A Conductive Polymer Promotes Neurite Outgrowth And Synaptogenesis In Primary Cortical Neurons In 3d, Qingsheng Zhang, Stephen T. Beirne, Kewei Shu, Dorna Esrafilzadeh, Xu-Feng Huang, Gordon G. Wallace Jan 2018

Electrical Stimulation With A Conductive Polymer Promotes Neurite Outgrowth And Synaptogenesis In Primary Cortical Neurons In 3d, Qingsheng Zhang, Stephen T. Beirne, Kewei Shu, Dorna Esrafilzadeh, Xu-Feng Huang, Gordon G. Wallace

Australian Institute for Innovative Materials - Papers

Deficits in neurite outgrowth and synaptogenesis have been recognized as an underlying developmental aetiology of psychosis. Electrical stimulation promotes neuronal induction including neurite outgrowth and branching. However, the effect of electrical stimulation using 3D electrodes on neurite outgrowth and synaptogenesis has not been explored. This study examined the effect of 3D electrical stimulation on 3D primary cortical neuronal cultures. 3D electrical stimulation improved neurite outgrowth in 3D neuronal cultures from both wild-Type and NRG1-knockout (NRG1-KO) mice. The expression of synaptophysin and PSD95 were elevated under 3D electrical stimulation. Interestingly, 3D electrical stimulation also improved neural cell aggregation as well as …

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Dirac Signature In Germanene On Semiconducting Substrate, Jincheng Zhuang, Chen Liu, Zhiyong Zhou, Gilberto Casillas, Haifeng Feng, Xun Xu, Jiaou Wang, Weichang Hao, Xiaolin Wang, Shi Xue Dou, Zhenpeng Hu, Yi Du Jan 2018

Dirac Signature In Germanene On Semiconducting Substrate, Jincheng Zhuang, Chen Liu, Zhiyong Zhou, Gilberto Casillas, Haifeng Feng, Xun Xu, Jiaou Wang, Weichang Hao, Xiaolin Wang, Shi Xue Dou, Zhenpeng Hu, Yi Du

Australian Institute for Innovative Materials - Papers

2D Dirac materials supported by nonmetallic substrates are of particular interest due to their significance for the realization of the quantum spin Hall effect and their application in field-effect transistors. Here, monolayer germanene is successfully fabricated on semiconducting germanium film with the support of a Ag(111) substrate. Its linear-like energy-momentum dispersion and large Fermi velocity are derived from the pronounced quasiparticle interference patterns in a √3 x √3 superstructure. In addition to Dirac fermion characteristics, the theoretical simulations reveal that the energy gap opens at the Brillouin zone center of the √3 x √3 restructured germanene, which is evoked by …

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Nanocrystalline Cellulose For Anisotropic Magnetoelectric Composites, Yan Zong, Zhilian Yue, Michael J. Higgins Jan 2018

Nanocrystalline Cellulose For Anisotropic Magnetoelectric Composites, Yan Zong, Zhilian Yue, Michael J. Higgins

Australian Institute for Innovative Materials - Papers

The emergence of piezoelectric polymers in magnetoelectric (ME) composites enables flexible and low-cost device fabrication though notably gives rise to the highest ME output voltages to date. Accordingly, the highest piezoresponsive polymers, poly(vinylidene fluoride) (PVDF) and its copolymers, are exclusively studied despite an inventory of unexplored piezoelectric polymers such as naturally occurring cellulose, that is only recently demonstrated in ME composites. Herein, the development of nanocrystalline cellulose (CNC)-based ME composites is reported on. Two types of CNC, nanospheres and nanowhiskers, are synthesized and incorporated in laminate composite, which exhibit a giant α ME ( > 1 V cm -1 Oe -1 …

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Discovery Of A Voltage-Stimulated Heartbeat Effect In Droplets Of Liquid Gallium, Zhenwei Yu, Yuchen Chen, Fei Yun, David L. Cortie, Lei Jiang, Xiaolin Wang Jan 2018

Discovery Of A Voltage-Stimulated Heartbeat Effect In Droplets Of Liquid Gallium, Zhenwei Yu, Yuchen Chen, Fei Yun, David L. Cortie, Lei Jiang, Xiaolin Wang

Australian Institute for Innovative Materials - Papers

Chemomechanical effects are known to initiate fluid oscillations in certain liquid metals; however, they typically produce an irregular motion that is difficult to deactivate or control. Here we show that stimulating liquid gallium with electrochemistry can cause a metal drop to exhibit a heart beating effect by shape shifting at a telltale frequency. Unlike the effects reported in the past for mercury, the symmetry-breaking forces generated by using gallium propel the drop several millimeters with velocities of the order of 1 cm per second. We demonstrate pulsating dynamics between 0 and 610 beats per minute for 50-150 μL droplets in …

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Defect Electrocatalytic Mechanism: Concept, Topological Structure And Perspective, Yi Jia, Jun Chen, Xiangdong Yao Jan 2018

Defect Electrocatalytic Mechanism: Concept, Topological Structure And Perspective, Yi Jia, Jun Chen, Xiangdong Yao

Australian Institute for Innovative Materials - Papers

Carbon-based materials have been attracting intense interest for electrocatalysis due to their various merits, such as abundance, low cost, high conductivity and tunable molecular structures. However, to date, the electrochemical activities of these electrocatalysts are mainly attributed to different active dopants (e.g. N, B, P or S), leading to a common concept that heteroatom doping is essential for carbon-based electrocatalysts. Recently, we presented a new concept where the specific topological defects could activate the oxygen reduction reaction (ORR) and developed a facile method to create such unique defects. Subsequent research has extended this new mechanism to other reactions, such as …

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A "Tandem" Strategy To Fabricate Flexible Graphene/Polypyrrole Nanofiber Film Using The Surfactant-Exfoliated Graphene For Supercapacitors, Kewei Shu, Yunfeng Chao, Shulei Chou, Caiyun Wang, Tian Zheng, Sanjeev Gambhir, Gordon G. Wallace Jan 2018

A "Tandem" Strategy To Fabricate Flexible Graphene/Polypyrrole Nanofiber Film Using The Surfactant-Exfoliated Graphene For Supercapacitors, Kewei Shu, Yunfeng Chao, Shulei Chou, Caiyun Wang, Tian Zheng, Sanjeev Gambhir, Gordon G. Wallace

Australian Institute for Innovative Materials - Papers

The surfactant-assisted liquid-phase exfoliation of expanded graphite can produce graphene sheets in large quantities with minimal defects. However, it is difficult to completely remove the surfactant from the final product, thus affecting the electrochemical properties of the produced graphene. In this article, a novel approach to fabricate flexible graphene/polypyrrole film was developed: using surfactant cetyltrimethylammonium bromide as a template for growth of polypyrrole nanofibers (PPyNFs) instead of removal after the exfoliation process; followed by a simple filtration method. The introduction of PPyNF not only increases the electrochemical performance, but also ensures flexibility. This composite film electrode offers a capacitance up …

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Controlled Synthesis Of Mesoporous Nitrogen-Doped Carbons With Highly Ordered Two-Dimensional Hexagonal Mesostructures And Their Chemical Activation, Abeer Enaiet Allah, Haibo Tan, Xingtao Xu, Ahmed Farghali, Mohamed Khedr, Abdulmohsen Alshehri, Yoshio Bando, Nanjundan Kumar, Yusuke Yamauchi Jan 2018

Controlled Synthesis Of Mesoporous Nitrogen-Doped Carbons With Highly Ordered Two-Dimensional Hexagonal Mesostructures And Their Chemical Activation, Abeer Enaiet Allah, Haibo Tan, Xingtao Xu, Ahmed Farghali, Mohamed Khedr, Abdulmohsen Alshehri, Yoshio Bando, Nanjundan Kumar, Yusuke Yamauchi

Australian Institute for Innovative Materials - Papers

Ordered mesoporous nitrogen-doped carbon (OMNC) materials are considered as the most promising material for supercapacitors. In this study, a highly ordered two-dimensional (2D) hexagonal mesostructured polymer was synthesized through a facile assembly of triblock polymer micelles and phenol-melamine/formaldehyde resin via an organic-organic assembly process in aqueous solution. After calcination, the novel OMNC materials with 2D hexagonal mesostructures were obtained. By further KOH activation, the surface area and the porosity of the OMNC significantly improved, and the internal mesoporous structures were maintained. The activated OMNC-800A displayed a specific capacitance as high as 475.75 F g-1at 0.5 A g-1with an outstanding cycling …

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Fe-Doped Phosphorene For The Nitrogen Reduction Reaction, Zengxi Wei, Yuefeng Zhang, Shuangyin Wang, Caiyun Wang, Jianmin Ma Jan 2018

Fe-Doped Phosphorene For The Nitrogen Reduction Reaction, Zengxi Wei, Yuefeng Zhang, Shuangyin Wang, Caiyun Wang, Jianmin Ma

Australian Institute for Innovative Materials - Papers

The nitrogen-to-ammonia conversion is one of the most important and challenging processes in chemistry. We have employed spin-polarized density functional theory to propose Fe-doped monolayer phosphorene (Fe-P) as a new catalyst for the N2reduction reaction at room temperature. Our results show that single-atom Fe is the active site, cooperating with P to activate the inert N-N triple bond and reduce N2to NH3via three reliable pathways. Our findings provide a new avenue for single atom catalytic nitrogen fixation under ambient conditions.

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Cose2/Mose2heterostructures With Enriched Water Adsorption/Dissociation Sites Towards Enhanced Alkaline Hydrogen Evolution Reaction, Guoqiang Zhao, Peng Li, Kun Rui, Yaping Chen, Shi Xue Dou, Wenping Sun Jan 2018

Cose2/Mose2heterostructures With Enriched Water Adsorption/Dissociation Sites Towards Enhanced Alkaline Hydrogen Evolution Reaction, Guoqiang Zhao, Peng Li, Kun Rui, Yaping Chen, Shi Xue Dou, Wenping Sun

Australian Institute for Innovative Materials - Papers

Transition-metal dichalcogenides (TMDs) are promising electrocatalysts toward the hydrogen evolution reaction (HER) in acid media, but they show significantly inferior activity in alkaline media due to the extremely sluggish water dissociation kinetics. Herein, CoSe2/MoSe2heterostructures with CoSe2quantum dots anchored on MoSe2nanosheets are synthesized towards enhanced alkaline HER catalytic activity. The incorporation of CoSe2is intended to construct additional water adsorption sites on the basal planes of MoSe2to promote water dissociation. The CoSe2/MoSe2heterostructures show substantially enhanced activity over MoSe2and CoSe2in 1 m KOH. The optimal overpotential required to reach a current density of 10 mA cm−2is merely 218 mV, which is more than …

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