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Recent progress in 2D materials for flexible supercapacitors

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Journal of Energy Chemistry 2018年第1期27卷 57-72页

作者： Yan Han Yu ge Yunfeng Chao Caiyun Wang gordon g.wallace Energy&Materials Engineering Centre College of Physics and Materials Science.Tianjin Normal UniversityTianjin 300387.China ARC Centre of Excellence for Electromaterials Science Intelligent Polymer Research InstituteUniversity of Wollongong.NSW 2500.Australia

High performance supercapacitors coupled with mechanical flexibility are needed to drive flexible and wearable electronics that have anesthetic appeal and multi-functionality. Two dimensional（2D） materials have attracted attention owing to their unique physicochemical and electrochemical properties, in addition to their ability to form hetero-structures with other nanomaterials further improving mechanical and electrochemical properties. After a brief introduction of supercapacitors and 2D materials, recent progress on flexible supercapacitors using 2D materials is reviewed. Here we provide insights into the structure–property relationships of flexible electrodes, in particular free-standing films. We also present our perspectives on the development of flexible supercapacitors.

关键词： 2D materials Flexible supercapacitors graphene Molybdenum disulfide MXenes

High-quality aluminum turbocharger impellers produced by thixocasting

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Transactions of Nonferrous Metals Society of China 2010年第9期20卷 1786-1791页

作者： g.wallace A.P.JACKSON S.P.MIDSON Q.ZHU Aluminum Complex Components Inc The Midson group Inc. Cummins Turbo Techno logies

The thixocasting process was chosen to produce the impellers as it is capable of producing castings with extremely high internal *** cut from the DC cast bars are re-heated to the semi-solid casting temperature, and a specially-designed runner and gating system is used to prevent oxide from the surface of the slugs from becoming incorporated into the *** technology used to produce the semi-solid impellers is described in *** semi-solid cast impellers, produced from an Al-Si-Mg-Cu alloy, are heat treated to the T6 *** from testing are presented demonstrating that the impellers are free of porosity and other internal *** mechanical property and fatigue data are presented showing that the semi-solid impellers have better properties than impellers produced by conventional casting and similar properties to forged and machined impellers.A short study is also described which identified suitable processing parameters to minimize hot tearing in the complex-shaped turbocharger impellers semi-solid cast from alloy *** surfaces of the impellers were examined using penetrant testing, and the results of modifying processing parameters on the propensity for surface cracking are *** aging study was performed to identify optimum mechanical strength.

关键词： semi-solid casting turbocharger impeller fatigue properties alloy 201

Three-dimensional bioprinting speeds up smart regenerative medicine

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National Science Review 2016年第3期3卷 331-344页

作者： Qi gu He Zhu Jing Li Xia Li Jie Hao gordon g.wallace Qi Zhou State Key Laboratory of Stem Cell and Reproductive Biology Institute of ZoologyChinese Academy of Sciences ARC Centre of Excellence for Electromaterials Science(ACES) Intelligent Polymer Research InstituteAIIM FacilityInnovation CampusUniversity of Wollongong

Biological materials can actively participate in the formation of bioactive organs and can even control cell fate to form functional tissues that we name as the smart regenerative medicine(SRM). The SRM requires interdisciplinary efforts to finalize the pre-designed organs. Three-dimensional(3D) printing, as an additive manufacturing technology, has been widely used in various fields due to its high resolution and individuation. In SRM, with the assistance of 3D printing, cells and biomaterials could be precisely positioned to construct complicated tissues. This review summarizes the state of the SRM advances and focuses in particular on the 3D printing application in biofabrication. We further discuss the issues of SRM development and finally propose some approaches for future 3D printing, which involves SRM.

关键词： 3D bioprinting regenerative medicine biomaterials tissues

Metal porphyrin intercalated reduced graphene oxide nanocomposite utilized for electrocatalytic oxygen reduction

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green Energy & Environment 2017年第3期2卷 285-293页

作者： Mingyan Wang Qing Wang Wei Zhu Ying Yang Huixian Zhou Fan Zhang Lihua Zhou Joselito M.Razal gordon g.wallace Jun Chen Jiangsu Marine Resources Development Research Institute Huaihai Institute of Technology Institute of Frontier Materials Deakin University Intelligent Polymer Research Institute ARC Centre of Excellence for Electromaterials Science Australian Institute of Innovative Materials University of Wollongong

In this paper, we report a simple and facile self-assembly method to successfully fabricate cationic metal porphyrin-MtTMPyP(Mt= Cobalt(Ⅱ), Manganese(Ⅲ), or Iron(Ⅲ); TMPyP = 5, 10, 15, 20-tetrakis(N-methylpyridinium-4-yl) porphyrin) intercalated into the layer of graphene oxide(gO) by the cooperative effects of electrostatic and π-π stacking interaction between positively charged metal porphyrin and negatively charged gO sheets. Followed by reduction with hydrazine vapor, a series of novel 2 D MtTMPyP/rgO_n were fabricated. The as-prepared 2 D hybrids were fully characterized and tested as non-noble metal catalysts for oxygen reduction reaction(ORR) in an alkaline medium. The MtTMPyP/rgO_n hybrids, especially CoTMPyP/rgO_5, demonstrated an improved electrocatalytic activity for ORR and a number of exchanged electrons close to 4-electron reaction, increased stability and excellent tolerance to methanol, showing a potential alternative catalyst for ORR in fuel cells and air batteries.

关键词： Metal porphyrin Reduced graphene oxide Intercalation Oxygen reduction reaction Catalyst

Engineering Metal-Based Catalysts for Electrochemical Reduction of Aqueous Carbon Dioxide

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Engineering Metal-Based Catalysts for Electrochemical Reduct...

Mechanisms, prevention and clinical implications of nonsteroidal anti-inflammatory drug-enteropathy

中国化学会第三届中国能源材料化学研讨会

作者： Caiyun Wang Yong Zhao gordon g.wallace Intelligent Polymer Research Institute ARC Centre of Excellence for Electromaterials ScienceAIIM FacilityUniversity of Wollongong

Electrochemically converting carbon dioxide(CO) into useful chemicals or liquid fuels is a promising approach to creating energy rich products as well as solving the environmental problems arising from the excessive use of nonrenewable fossil *** challenges mainly include sluggish reaction,poor energy efficiency and product selectivity owing to the large overpotential required for CO activation,complicated CO reduction pathway and competitive H evolution.[1] We focus on developing robust,inexpensive and highly selective catalysts and engineering the catalyst surface to overcome these *** earth abundant element tin(Sn) as a catalyst is one *** tuning of local chemical environment and electronic structure of Sn sites greatly impact on the binding ability of intermediates and the reaction pathway of CO *** nanoparticles on copper oxide nanowires selectively convert CO to CO with a high CO faradaic efficiency,a high CO partial current density at a moderate overpotential [2].We further explored the use of sustainable organic matter-electrospun carbon nanofiber to confine Sn *** electrocatalytic activity and selectivity of nanostructured Sn modified nitrogen(N)-doped carbon nanofiber hybrid catalyst can even be tuned:Sn nanoparticles can drive efficient formic acid formation,while atomically dispersed Sn species switches the dominant product from formic acid to CO.[3] gold(Au) is one of the best catalysts that can overcome these barriers and promote the CO-to-CO conversion *** the Au particle to sub-5 nm can significantly increase the utilization efficiency,reducing the cost for large-scale *** we have developed ultrasmall Au NPs on graphene sheets with very high mass current density via an easy preparation route,as well as a high selectivity via a simple amine modification strategy to suppress H evolution [4].

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World Journal of gastroenterology 2013年第12期19卷 1861-1876页

作者： John L wallace Farncombe Family Digestive Health Research Institute McMaster University Inflammation Research Network University of Calgary

This article reviews the latest developments in understanding the pathogenesis, detection and treatment of small intestinal damage and bleeding caused by nonsteroidal anti-inflammatory drugs (NSAIDs). With improvements in the detection of NSAID-induced damage in the small intestine, it is now clear that this injury and the associated bleeding occurs more frequently than that occurring in the stomach and duodenum, and can also be regarded as more dangerous. However, there are no proven-effective therapies for NSAID-enteropathy, and detection remains a challenge, particularly because of the poor correlation between tissue injury and symptoms. Moreover, recent studies suggest that commonly used drugs for protecting the upper gastrointestinal tract (i.e., proton pump inhibitors) can significantly worsen NSAID-induced damage in the small intestine. The pathogenesis of NSAID-enteropathy is complex, but studies in animal models are shedding light on the key factors that contribute to ulceration and bleeding, and are providing clues to the development of effective therapies and prevention strategies. Novel NSAIDs that do not cause small intestinal damage in animal models offer hope for a solution to this serious adverse effect of one of the most widely used classes of drugs.

关键词： Anti-inflammatory Ulcer Prostaglandin Non-steroidal Bleeding Intestinal Bile Enterohepatic Bacteria Hydrogen sulfide Aspirin Hemorrhage

Some Remarks on the Boundedness and Convergence Properties of Smooth Sliding Mode Controllers

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International Journal of Automation and computing 2009年第2期6卷 154-158页

作者： wallace Moreira Bessa Federal University of Rio grande do Norte Department of Mechanical Engineering

Conventional sliding mode controllers are based on the assumption of switching control, but a well-known drawback of such controllers is the chattering phenomenon. To overcome the undesirable chattering effects, the discontinuity in the control law can be smoothed out in a thin boundary layer neighboring the switching surface. In this paper, rigorous proofs of the boundedness and convergence properties of smooth sliding mode controllers are presented. This result corrects flawed conclusions previously reached in the literature. An illustrative example is also presented in order to confirm the convergence of the tracking error vector to the defined bounded region.

关键词： Convergence analysis Lyapunov methods nonlinear control sliding mode.

Parrondo's paradox for chaos control and anticontrol of fractional-order systems

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Chinese Physics B 2016年第1期25卷 507-513页

作者： Marius-F Danca wallace K S Tang Department of Mathematics and Computer Science Avram Iancu University Romanian Institute for Science and Technology Department of Electronic Engineering City University of Hong Kong

We present the generalized forms of Parrondo＇s paradox existing in fractional-order nonlinear systems. The gener- alization is implemented by applying a parameter switching （PS） algorithm to the corresponding initial value problems associated with the fractional-order nonlinear systems. The PS algorithm switches a system parameter within a specific set of N 〉 2 values when solving the system with some numerical integration method. It is proven that any attractor of the concerned system can be approximated numerically. By replacing the words ＂winning＂ and ＂loosing＂ in the classical Parrondo＇s paradox with ＂order＂ and ＂chaos＂, respectively, the PS algorithm leads to the generalized Parrondo＇s paradox： chaos1 ＋ chaos2 ＋..- ＋ chaosN = order and order1 ＋ order2 ＋.-. ＋ orderN = chaos. Finally, the concept is well demon- strated with the results based on the fractional-order Chen system.

关键词： Parrondo's paradox chaos control parameter switching algorithm fractional-order Chen system

Lowland tapir (Tapirus terrestris) distribution, activity patterns and relative abundance in the greater Madidi-Tambopata Landscape

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Integrative Zoology 2012年第4期7卷 407-419页

作者： Robert wallace guido AYALA Maria VISCARRA Wildlife Conservation Society(WCS) Greater Madidi-Tambopata LandscapeLa PazBolivia WCS New YorkUSA

Lowland tapir distribution is described in northwestern Bolivia and southeastern Peru within the greater Madidi-Tambopata Landscape,a priority Tapir Conservation Unit,using 1255 distribution points derived from cam-era trapping efforts,field research and interviews with park guards from 5 national protected areas and hunt-ers from 19 local communities.A total of 392 independent camera trapping events from 14 camera trap surveys at 11 sites demonstrated the nocturnal and crepuscular activity patterns(86%)of the lowland tapir and provide 3 indices of relative abundance for spatial and temporal *** rates for lowland tapirs were not significantly different between camera trapping stations placed on river beaches versus those placed in the *** tapir capture rates were significantly higher in the national protected areas of the region versus in-digenous territories and unprotected portions of the *** rates through time suggested that low-land tapir populations are recovering within the Tuichi Valley,an area currently dedicated towards ecotourism activities,following the creation(1995)and subsequent implementation(1997)of the Madidi National Park in *** on our distributional data and published conservative estimates of population density,we calcu-lated that this transboundary landscape holds an overall lowland tapir population of between 14540 and 36351 individuals,of which at least 24.3%are under protection from national and municipal *** such,the great-er Madidi-Tambopata Landscape should be considered a lowland tapir population stronghold and priority con-servation efforts are discussed in order to maintain this population.

关键词： Amazon Bolivia camera trapping Peru population stronghold