The Experts below are selected from a list of 71706 Experts worldwide ranked by ideXlab platform
Richard T Carlin - One of the best experts on this subject based on the ideXlab platform.
-
ionic Liquid Polymer gel electrolytes from hydrophilic and hydrophobic ionic Liquids
Journal of Electroanalytical Chemistry, 1998Co-Authors: Joan Fuller, Amy C Breda, Richard T CarlinAbstract:Abstract Ionic Liquid–Polymer gels were prepared by incorporating hydrophilic EMIBF 4 and EMI(triflate) (EMI + =1-ethyl-3-methylimidazolium) and hydrophobic BMIPF 6 (BMI + =1-(1-butyl)-3-methylimidazolium) room-temperature ionic Liquids into a poly(vinylidene fluoride)–hexafluoropropylene coPolymer (PVdF(HFP)) matrix. Gel electrolytes prepared with ionic Liquid:PVdF(HFP) mass ratios of 2:1 exhibited ionic conductivities of >10 −3 S cm −1 at room temperature and >10 −2 S cm −1 at 100°C. The BMIPF 6 -PVdF(HFP) gel was incorporated into electrochemical cells, employing graphite intercalation electrodes for both the anode and cathode, to construct single and bipolar cells displaying open-circuit voltages of 3.77 and 7.86 V, respectively. New inexpensive preparative routes for the hydrophilic ionic Liquids were developed that utilize the metathesis reaction of EMICl with the appropriate ammonium salt in acetone or acetonitrile to produce high purity products.
-
ionic Liquid Polymer gel electrolytes
Journal of The Electrochemical Society, 1997Co-Authors: Joan Fuller, Amy C Breda, Richard T CarlinAbstract:New rubbery gel electrolytes have been prepared from room temperature ionic Liquids and poly(vinylidene fluoride)-hexafluoropropylene coPolymer [PVdF(HFP)]. The ionic Liquids employed in these preparations were 1-ethyl-3-methylimidazolium salts of triflate (CF 3 SO 3 - ) and BF 4 - . When properly processed, the ionic Liquid-PVdF(HFP) gels are freestanding, flexible films with room temperature conductivities ranging from 1.1 to 5.8 mS cm -1 . Because both the ionic Liquids and the PVdF(HFP) are nonvolatile and are thermally stable, the gels can be operated at elevated temperatures without performance degradation. An ionic conductivity of 41 mS cm -1 was measured for a triflate ionic Liquid-PVdF(HFP) gel at 205°C.
Joan Fuller - One of the best experts on this subject based on the ideXlab platform.
-
ionic Liquid Polymer gel electrolytes from hydrophilic and hydrophobic ionic Liquids
Journal of Electroanalytical Chemistry, 1998Co-Authors: Joan Fuller, Amy C Breda, Richard T CarlinAbstract:Abstract Ionic Liquid–Polymer gels were prepared by incorporating hydrophilic EMIBF 4 and EMI(triflate) (EMI + =1-ethyl-3-methylimidazolium) and hydrophobic BMIPF 6 (BMI + =1-(1-butyl)-3-methylimidazolium) room-temperature ionic Liquids into a poly(vinylidene fluoride)–hexafluoropropylene coPolymer (PVdF(HFP)) matrix. Gel electrolytes prepared with ionic Liquid:PVdF(HFP) mass ratios of 2:1 exhibited ionic conductivities of >10 −3 S cm −1 at room temperature and >10 −2 S cm −1 at 100°C. The BMIPF 6 -PVdF(HFP) gel was incorporated into electrochemical cells, employing graphite intercalation electrodes for both the anode and cathode, to construct single and bipolar cells displaying open-circuit voltages of 3.77 and 7.86 V, respectively. New inexpensive preparative routes for the hydrophilic ionic Liquids were developed that utilize the metathesis reaction of EMICl with the appropriate ammonium salt in acetone or acetonitrile to produce high purity products.
-
ionic Liquid Polymer gel electrolytes
Journal of The Electrochemical Society, 1997Co-Authors: Joan Fuller, Amy C Breda, Richard T CarlinAbstract:New rubbery gel electrolytes have been prepared from room temperature ionic Liquids and poly(vinylidene fluoride)-hexafluoropropylene coPolymer [PVdF(HFP)]. The ionic Liquids employed in these preparations were 1-ethyl-3-methylimidazolium salts of triflate (CF 3 SO 3 - ) and BF 4 - . When properly processed, the ionic Liquid-PVdF(HFP) gels are freestanding, flexible films with room temperature conductivities ranging from 1.1 to 5.8 mS cm -1 . Because both the ionic Liquids and the PVdF(HFP) are nonvolatile and are thermally stable, the gels can be operated at elevated temperatures without performance degradation. An ionic conductivity of 41 mS cm -1 was measured for a triflate ionic Liquid-PVdF(HFP) gel at 205°C.
Michael Gratzel - One of the best experts on this subject based on the ideXlab platform.
-
high efficiency dye sensitized nanocrystalline solar cells based on ionic Liquid Polymer gel electrolyte
Chemical Communications, 2002Co-Authors: Peng Wang, Shaik M Zakeeruddin, Ivan Exnar, Michael GratzelAbstract:An ionic Liquid Polymer gel containing 1-methyl-3-propylimidazolium iodide (MPII) and poly(vinylidenefluoride-co-hexafluoropropylene) (PVDF–HFP) has been employed as quasi-solid-state electrolyte in dye-sensitized nanocrystalline TiO2 solar cells with an overall conversion efficiency of 5.3% at AM 1.5 illumination.
Thierry Lebey - One of the best experts on this subject based on the ideXlab platform.
-
dynamics of particle chain formation in a Liquid Polymer under ac electric field modeling and experiments
Journal of Physics D, 2017Co-Authors: Guillaume Belijar, Zarel Valdeznava, Sombel Diaham, Lionel Laudebat, T B Jones, Thierry LebeyAbstract:Polymer/ceramic composite materials are of great interest for their many potential applications because of their ability to combine at least two properties of the constitutive elements: particles and matrix. In most cases, such enhanced properties are required only in one direction. Orthotropic materials can be elaborated by applying an ac electric field to form particle chain structures in the direction of the electric field due to the dielectrophoretic interactions affecting the particles. However, there is still a lack in the understanding of the impact of the structures on the properties of the material. The aim of this study is to propose a predictive model for the evolution of the permittivity during the chain formation, by including micro- and macroscopic phenomena. The chaining model is based on dipole–dipole interactions and the dielectric permittivity is computed through a finite element method. In parallel, an experimental study is performed with online permittivity measurements of composites during chaining. The developed model is able to predict the experimental results from 1 vol% while taking into account parameters such as the resin viscosity and permittivity and the transient evolution of the applied electric field. The formation of particle chains inside a material has applications in many domains such as electrorheological fluids, anisotropic composites, self-recovery materials etc. Such a developed model is a valuable tool for the tailoring of materials.
-
Particle chain formation in a Liquid Polymer under ac electric field: Model and experiments
2016 IEEE International Conference on Dielectrics (ICD), 2016Co-Authors: Guillaume Belijar, Sombel Diaham, Thierry Lebey, Lionel Laudebat, Z. Valdez-nava, T B JonesAbstract:This study treats the influence upon the bulk dielectric properties of epoxy resin loaded with barium titanate (BaTiO3) particles when an ac electric field is used to form the particles into chains. A particle chain formation model, coupled with finite element method (FEM) solution of the Laplace's equation leads to estimates for permittivity as a function of the composite structure. Simulation results are then compared with experimental measurements that corroborate the time-dependent evolution of the dielectric permittivity.
Amy C Breda - One of the best experts on this subject based on the ideXlab platform.
-
ionic Liquid Polymer gel electrolytes from hydrophilic and hydrophobic ionic Liquids
Journal of Electroanalytical Chemistry, 1998Co-Authors: Joan Fuller, Amy C Breda, Richard T CarlinAbstract:Abstract Ionic Liquid–Polymer gels were prepared by incorporating hydrophilic EMIBF 4 and EMI(triflate) (EMI + =1-ethyl-3-methylimidazolium) and hydrophobic BMIPF 6 (BMI + =1-(1-butyl)-3-methylimidazolium) room-temperature ionic Liquids into a poly(vinylidene fluoride)–hexafluoropropylene coPolymer (PVdF(HFP)) matrix. Gel electrolytes prepared with ionic Liquid:PVdF(HFP) mass ratios of 2:1 exhibited ionic conductivities of >10 −3 S cm −1 at room temperature and >10 −2 S cm −1 at 100°C. The BMIPF 6 -PVdF(HFP) gel was incorporated into electrochemical cells, employing graphite intercalation electrodes for both the anode and cathode, to construct single and bipolar cells displaying open-circuit voltages of 3.77 and 7.86 V, respectively. New inexpensive preparative routes for the hydrophilic ionic Liquids were developed that utilize the metathesis reaction of EMICl with the appropriate ammonium salt in acetone or acetonitrile to produce high purity products.
-
ionic Liquid Polymer gel electrolytes
Journal of The Electrochemical Society, 1997Co-Authors: Joan Fuller, Amy C Breda, Richard T CarlinAbstract:New rubbery gel electrolytes have been prepared from room temperature ionic Liquids and poly(vinylidene fluoride)-hexafluoropropylene coPolymer [PVdF(HFP)]. The ionic Liquids employed in these preparations were 1-ethyl-3-methylimidazolium salts of triflate (CF 3 SO 3 - ) and BF 4 - . When properly processed, the ionic Liquid-PVdF(HFP) gels are freestanding, flexible films with room temperature conductivities ranging from 1.1 to 5.8 mS cm -1 . Because both the ionic Liquids and the PVdF(HFP) are nonvolatile and are thermally stable, the gels can be operated at elevated temperatures without performance degradation. An ionic conductivity of 41 mS cm -1 was measured for a triflate ionic Liquid-PVdF(HFP) gel at 205°C.