The Experts below are selected from a list of 57084 Experts worldwide ranked by ideXlab platform
Pingkai Jiang - One of the best experts on this subject based on the ideXlab platform.
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strawberry like core shell ag polydopamine batio3 hybrid nanoparticles for high k polymer nanocomposites with high energy density and low diElectric loss
Advanced Materials Interfaces, 2015Co-Authors: Ke Yang, Xingyi Huang, Jinliang He, Pingkai JiangAbstract:Flexible nanocomposites comprising of polymer and high-diElectric-constant (high-k) ceramic nanoparticles are becoming increasingly attractive for diElectric and energy storage applications in modern electronic and Electric Industry. However, a huge challenge still remains. Namely, the increase of diElectric constant usually at the cost of significant decrease of breakdown strength of the nanocomposites because of the Electric field distortion and concentration induced by the high-k filler. To address this long-standing problem, by using nano-Ag decorated core–shell polydopamine (PDA) coated BaTiO3 (BT) hybrid nanoparticles, a new strategy is developed to prepare high-k polymer nanocomposites with high breakdown strength. The strawberry-like BT-PDA-Ag based ferroElectric polymer [i.e., poly(vinylideneflyoride-co-hexafluroro propylene), P(VDF-HFP)] nanocomposites exhibit greatly enhanced energy density and significantly suppressed diElectric loss as well as leakage current density in comparison with the nanocomposites with the core–shell structured BT-PDA. Coulomb-blockade effect of super-small nano-Ag is used to explain the observed performance enhancement of the nanocomposites. The simplicity and scalability of the described approach provide a promising route to polymer nanocomposites for diElectric and energy storage applications.
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fluoro polymer functionalized graphene for flexible ferroElectric polymer based high k nanocomposites with suppressed diElectric loss and low percolation threshold
Nanoscale, 2014Co-Authors: Ke Yang, Xingyi Huang, Lijun Fang, Jinliang He, Pingkai JiangAbstract:Flexible nanodiElectric materials with high diElectric constant and low diElectric loss have huge potential applications in the modern electronic and Electric Industry. Graphene sheets (GS) and reduced-graphene oxide (RGO) are promising fillers for preparing flexible polymer-based nanodiElectric materials because of their unique two-dimensional structure and excellent Electrical and mechanical properties. However, the easy aggregation of GS/RGO significantly limits the potential of graphene in enhancing the diElectric constant of polymer composites. In addition, the poor filler/matrix nanoscale interfacial adhesion also causes difficulties in suppressing the diElectric loss of the composites. In this work, using a facile and environmentally friendly approach, polydopamine coated RGO (PDA-RGO) and fluoro-polymer functionalized RGO (PF-PDA-RGO) were prepared. Compared with the RGO prepared by the conventional methods [i.e. hydrazine reduced-graphene oxide (H-RGO)] and PDA-RGO, the resulting PF-PDA-RGO nanosheets exhibit excellent dispersion in the ferroElectric polymer matrix [i.e. poly(vinylidene fluoride-co-hexafluoro propylene), P(VDF-HFP)] and strong interfacial adhesion with the matrix, leading to a low percolation threshold (fc = 1.06 vol%) and excellent flexibility for the corresponding nanocomposites. Among the three nanocomposites, the P(VDF-HFP)/PF-PDA-RGO nanocomposites exhibited the optimum performance (i.e. simultaneously having high diElectric constant and low diElectric loss). For instance, at 1000 Hz, the P(VDF-HFP) nanocomposite sample with 1.0 vol% PF-PDA-RGO has a diElectric constant of 107.9 and a diElectric loss of 0.070, showing good potential for diElectric applications. Our strategy provides a new pathway to prepare high performance flexible nanodiElectric materials.
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fluoro polymer batio3 hybrid nanoparticles prepared via raft polymerization toward ferroElectric polymer nanocomposites with high diElectric constant and low diElectric loss for energy storage application
Chemistry of Materials, 2013Co-Authors: Ke Yang, Yanhui Huang, Xingyi Huang, Liyuan Xie, Pingkai JiangAbstract:Polymer nanocomposites with high energy density and low diElectric loss are highly desirable in electronic and Electric Industry. Achieving the ability to tailor the interface between polymer and nanoparticle is the key issue to realize desirable diElectric properties and high energy density in the nanocomposites. However, the understanding of the role of interface on the diElectric properties and energy density of polymer nanocomposites is still very poor. In this work, we report a novel strategy to improve the interface between the high diElectric constant nanoparticles (i.e., BaTiO3) and ferroElectric polymer [i.e., poly(vinylidene fluoride-co-hexafluoro propylene)]. Core–shell structured BaTiO3 nanoparticles either with different shell thickness or with different molecular structure of the shell were prepared by grafting two types of fluoroalkyl acrylate monomers via surface-initiated reversible addition–fragmentation chain transfer (RAFT) polymerization. The diElectric properties and energy storage c...
Ke Yang - One of the best experts on this subject based on the ideXlab platform.
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strawberry like core shell ag polydopamine batio3 hybrid nanoparticles for high k polymer nanocomposites with high energy density and low diElectric loss
Advanced Materials Interfaces, 2015Co-Authors: Ke Yang, Xingyi Huang, Jinliang He, Pingkai JiangAbstract:Flexible nanocomposites comprising of polymer and high-diElectric-constant (high-k) ceramic nanoparticles are becoming increasingly attractive for diElectric and energy storage applications in modern electronic and Electric Industry. However, a huge challenge still remains. Namely, the increase of diElectric constant usually at the cost of significant decrease of breakdown strength of the nanocomposites because of the Electric field distortion and concentration induced by the high-k filler. To address this long-standing problem, by using nano-Ag decorated core–shell polydopamine (PDA) coated BaTiO3 (BT) hybrid nanoparticles, a new strategy is developed to prepare high-k polymer nanocomposites with high breakdown strength. The strawberry-like BT-PDA-Ag based ferroElectric polymer [i.e., poly(vinylideneflyoride-co-hexafluroro propylene), P(VDF-HFP)] nanocomposites exhibit greatly enhanced energy density and significantly suppressed diElectric loss as well as leakage current density in comparison with the nanocomposites with the core–shell structured BT-PDA. Coulomb-blockade effect of super-small nano-Ag is used to explain the observed performance enhancement of the nanocomposites. The simplicity and scalability of the described approach provide a promising route to polymer nanocomposites for diElectric and energy storage applications.
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fluoro polymer functionalized graphene for flexible ferroElectric polymer based high k nanocomposites with suppressed diElectric loss and low percolation threshold
Nanoscale, 2014Co-Authors: Ke Yang, Xingyi Huang, Lijun Fang, Jinliang He, Pingkai JiangAbstract:Flexible nanodiElectric materials with high diElectric constant and low diElectric loss have huge potential applications in the modern electronic and Electric Industry. Graphene sheets (GS) and reduced-graphene oxide (RGO) are promising fillers for preparing flexible polymer-based nanodiElectric materials because of their unique two-dimensional structure and excellent Electrical and mechanical properties. However, the easy aggregation of GS/RGO significantly limits the potential of graphene in enhancing the diElectric constant of polymer composites. In addition, the poor filler/matrix nanoscale interfacial adhesion also causes difficulties in suppressing the diElectric loss of the composites. In this work, using a facile and environmentally friendly approach, polydopamine coated RGO (PDA-RGO) and fluoro-polymer functionalized RGO (PF-PDA-RGO) were prepared. Compared with the RGO prepared by the conventional methods [i.e. hydrazine reduced-graphene oxide (H-RGO)] and PDA-RGO, the resulting PF-PDA-RGO nanosheets exhibit excellent dispersion in the ferroElectric polymer matrix [i.e. poly(vinylidene fluoride-co-hexafluoro propylene), P(VDF-HFP)] and strong interfacial adhesion with the matrix, leading to a low percolation threshold (fc = 1.06 vol%) and excellent flexibility for the corresponding nanocomposites. Among the three nanocomposites, the P(VDF-HFP)/PF-PDA-RGO nanocomposites exhibited the optimum performance (i.e. simultaneously having high diElectric constant and low diElectric loss). For instance, at 1000 Hz, the P(VDF-HFP) nanocomposite sample with 1.0 vol% PF-PDA-RGO has a diElectric constant of 107.9 and a diElectric loss of 0.070, showing good potential for diElectric applications. Our strategy provides a new pathway to prepare high performance flexible nanodiElectric materials.
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fluoro polymer batio3 hybrid nanoparticles prepared via raft polymerization toward ferroElectric polymer nanocomposites with high diElectric constant and low diElectric loss for energy storage application
Chemistry of Materials, 2013Co-Authors: Ke Yang, Yanhui Huang, Xingyi Huang, Liyuan Xie, Pingkai JiangAbstract:Polymer nanocomposites with high energy density and low diElectric loss are highly desirable in electronic and Electric Industry. Achieving the ability to tailor the interface between polymer and nanoparticle is the key issue to realize desirable diElectric properties and high energy density in the nanocomposites. However, the understanding of the role of interface on the diElectric properties and energy density of polymer nanocomposites is still very poor. In this work, we report a novel strategy to improve the interface between the high diElectric constant nanoparticles (i.e., BaTiO3) and ferroElectric polymer [i.e., poly(vinylidene fluoride-co-hexafluoro propylene)]. Core–shell structured BaTiO3 nanoparticles either with different shell thickness or with different molecular structure of the shell were prepared by grafting two types of fluoroalkyl acrylate monomers via surface-initiated reversible addition–fragmentation chain transfer (RAFT) polymerization. The diElectric properties and energy storage c...
Zahoor Ali Khan - One of the best experts on this subject based on the ideXlab platform.
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an accurate and fast converging short term load forecasting model for industrial applications in a smart grid
IEEE Transactions on Industrial Informatics, 2017Co-Authors: Ashfaq Ahmad, Nadeem Javaid, Mohsen Guizani, Nabil Alrajeh, Zahoor Ali KhanAbstract:Short-term load forecasting (STLF) models are very important for Electric Industry in the trade of energy. These models have many applications in the day-to-day operations of Electric utilities such as energy generation planning, load switching, energy purchasing, infrastructure maintenance, and contract evaluation. A large variety of STLF models have been developed that trade off between forecast accuracy and convergence rate. This paper presents an accurate and fast converging STLF model for industrial applications in a smart grid. In order to improve the forecast accuracy, modifications are devised in two popular techniques: mutual information based feature selection; and enhanced differential evolution algorithm based error minimization. On the other hand, the convergence rate of the overall forecast strategy is enhanced by devising modifications in the heuristic algorithm and in the training process of the artificial neural network. Simulation results show that accuracy of the newly proposed forecast model is 99.5% with moderate execution time, i.e., we have decreased the average execution of the existing bilevel forecast strategy by 52.38%.
Meichiu Pan - One of the best experts on this subject based on the ideXlab platform.
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using adaptive network based fuzzy inference system to forecast regional Electricity loads
Energy Conversion and Management, 2008Co-Authors: Lichih Ying, Meichiu PanAbstract:Since accurate regional load forecasting is very important for improvement of the management performance of the Electric Industry, various regional load forecasting methods have been developed. The purpose of this study is to apply the adaptive network based fuzzy inference system (ANFIS) model to forecast the regional Electricity loads in Taiwan and demonstrate the forecasting performance of this model. Based on the mean absolute percentage errors and statistical results, we can see that the ANFIS model has better forecasting performance than the regression model, artificial neural network (ANN) model, support vector machines with genetic algorithms (SVMG) model, recurrent support vector machines with genetic algorithms (RSVMG) model and hybrid ellipsoidal fuzzy systems for time series forecasting (HEFST) model. Thus, the ANFIS model is a promising alternative for forecasting regional Electricity loads.
Xingyi Huang - One of the best experts on this subject based on the ideXlab platform.
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strawberry like core shell ag polydopamine batio3 hybrid nanoparticles for high k polymer nanocomposites with high energy density and low diElectric loss
Advanced Materials Interfaces, 2015Co-Authors: Ke Yang, Xingyi Huang, Jinliang He, Pingkai JiangAbstract:Flexible nanocomposites comprising of polymer and high-diElectric-constant (high-k) ceramic nanoparticles are becoming increasingly attractive for diElectric and energy storage applications in modern electronic and Electric Industry. However, a huge challenge still remains. Namely, the increase of diElectric constant usually at the cost of significant decrease of breakdown strength of the nanocomposites because of the Electric field distortion and concentration induced by the high-k filler. To address this long-standing problem, by using nano-Ag decorated core–shell polydopamine (PDA) coated BaTiO3 (BT) hybrid nanoparticles, a new strategy is developed to prepare high-k polymer nanocomposites with high breakdown strength. The strawberry-like BT-PDA-Ag based ferroElectric polymer [i.e., poly(vinylideneflyoride-co-hexafluroro propylene), P(VDF-HFP)] nanocomposites exhibit greatly enhanced energy density and significantly suppressed diElectric loss as well as leakage current density in comparison with the nanocomposites with the core–shell structured BT-PDA. Coulomb-blockade effect of super-small nano-Ag is used to explain the observed performance enhancement of the nanocomposites. The simplicity and scalability of the described approach provide a promising route to polymer nanocomposites for diElectric and energy storage applications.
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fluoro polymer functionalized graphene for flexible ferroElectric polymer based high k nanocomposites with suppressed diElectric loss and low percolation threshold
Nanoscale, 2014Co-Authors: Ke Yang, Xingyi Huang, Lijun Fang, Jinliang He, Pingkai JiangAbstract:Flexible nanodiElectric materials with high diElectric constant and low diElectric loss have huge potential applications in the modern electronic and Electric Industry. Graphene sheets (GS) and reduced-graphene oxide (RGO) are promising fillers for preparing flexible polymer-based nanodiElectric materials because of their unique two-dimensional structure and excellent Electrical and mechanical properties. However, the easy aggregation of GS/RGO significantly limits the potential of graphene in enhancing the diElectric constant of polymer composites. In addition, the poor filler/matrix nanoscale interfacial adhesion also causes difficulties in suppressing the diElectric loss of the composites. In this work, using a facile and environmentally friendly approach, polydopamine coated RGO (PDA-RGO) and fluoro-polymer functionalized RGO (PF-PDA-RGO) were prepared. Compared with the RGO prepared by the conventional methods [i.e. hydrazine reduced-graphene oxide (H-RGO)] and PDA-RGO, the resulting PF-PDA-RGO nanosheets exhibit excellent dispersion in the ferroElectric polymer matrix [i.e. poly(vinylidene fluoride-co-hexafluoro propylene), P(VDF-HFP)] and strong interfacial adhesion with the matrix, leading to a low percolation threshold (fc = 1.06 vol%) and excellent flexibility for the corresponding nanocomposites. Among the three nanocomposites, the P(VDF-HFP)/PF-PDA-RGO nanocomposites exhibited the optimum performance (i.e. simultaneously having high diElectric constant and low diElectric loss). For instance, at 1000 Hz, the P(VDF-HFP) nanocomposite sample with 1.0 vol% PF-PDA-RGO has a diElectric constant of 107.9 and a diElectric loss of 0.070, showing good potential for diElectric applications. Our strategy provides a new pathway to prepare high performance flexible nanodiElectric materials.
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fluoro polymer batio3 hybrid nanoparticles prepared via raft polymerization toward ferroElectric polymer nanocomposites with high diElectric constant and low diElectric loss for energy storage application
Chemistry of Materials, 2013Co-Authors: Ke Yang, Yanhui Huang, Xingyi Huang, Liyuan Xie, Pingkai JiangAbstract:Polymer nanocomposites with high energy density and low diElectric loss are highly desirable in electronic and Electric Industry. Achieving the ability to tailor the interface between polymer and nanoparticle is the key issue to realize desirable diElectric properties and high energy density in the nanocomposites. However, the understanding of the role of interface on the diElectric properties and energy density of polymer nanocomposites is still very poor. In this work, we report a novel strategy to improve the interface between the high diElectric constant nanoparticles (i.e., BaTiO3) and ferroElectric polymer [i.e., poly(vinylidene fluoride-co-hexafluoro propylene)]. Core–shell structured BaTiO3 nanoparticles either with different shell thickness or with different molecular structure of the shell were prepared by grafting two types of fluoroalkyl acrylate monomers via surface-initiated reversible addition–fragmentation chain transfer (RAFT) polymerization. The diElectric properties and energy storage c...