The Experts below are selected from a list of 67560 Experts worldwide ranked by ideXlab platform
Jean Le Bideau - One of the best experts on this subject based on the ideXlab platform.
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Ionic and electronic conductivities in carbon nanotubes - ionogel solid device
Journal of Materials Chemistry, 2011Co-Authors: J.-b. Ducros, N. Buchtova, A. Magrez, Olivier Chauvet, Jean Le BideauAbstract:Easy immobilisation of carbon nanofillers in a solid state device featuring mesopores filled with ionic liquid (IL) is presented. Such a route allows a Good Dispersion of carbon nanotubes (CNTs) and carbon fibers in N-methyl-N-propylpyrrolidinium bis(trifluoromethanesulfonyl)imide, subsequently followed by the confinement of the whole within a porous silica matrix. We thus obtain herein a new type of hybrid ionogel within a solid device containing a percolating IL network as its real liquid state, as well as presenting a percolating carbon network. The process is carried out within a single step, without any chemistry for covalent grafting. We show that an IL with a non π-conjugated cation allows Good Dispersion of the carbon nanotubes, with a subsequent percolation for a loading level lower than 3.6 wt%. Together with the dynamic IL properties of ionogels, we thus present herein an inorganic-solid host containing carbon nanofillers, which gives the solid device ionic and electronic conductivities.
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Ionic and electronic conductivities in carbon nanotubes – ionogel solid device
J. Mater. Chem., 2011Co-Authors: J.-b. Ducros, N. Buchtova, A. Magrez, Olivier Chauvet, Jean Le BideauAbstract:Easy immobilisation of carbon nanofillers in a solid state device featuring mesopores filled with ionic liquid (IL) is presented. Such a route allows a Good Dispersion of carbon nanotubes (CNTs) and carbon fibers in N-methyl-N-propylpyrrolidinium bis(trifluoromethanesulfonyl)imide, subsequently followed by the confinement of the whole within a porous silica matrix. We thus obtain herein a new type of hybrid ionogel within a solid device containing a percolating IL network as its real liquid state, as well as presenting a percolating carbon network. The process is carried out within a single step, without any chemistry for covalent grafting. We show that an IL with a non π-conjugated cation allows Good Dispersion of the carbon nanotubes, with a subsequent percolation for a loading level lower than 3.6 wt%. Together with the dynamic IL properties of ionogels, we thus present herein an inorganic-solid host containing carbon nanofillers, which gives the solid device ionic and electronic conductivities.
Rudolf Zentel - One of the best experts on this subject based on the ideXlab platform.
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strategy for Good Dispersion of well defined tetrapods in semiconducting polymer matrices
Macromolecular Rapid Communications, 2014Co-Authors: Jaehoon Lim, Lisa Zur Borg, Stefan Dolezel, Friederike Schmid, Kookheon Char, Rudolf ZentelAbstract:The morphology or Dispersion control in inorganic/organic hybrid systems is studied, which consist of monodisperse CdSe tetrapods (TPs) with grafted semiconducting block copolymers with excess polymers of the same type. Tetrapod arm-length and amount of polymer loading are varied in order to find the ideal morphology for hybrid solar cells. Additionally, polymers without anchor groups are mixed with the TPs to study the effect of such anchor groups on the hybrid morphology. A numerical model is developed and Monte Carlo simulations to study the basis of compatibility or dispersibility of TPs in polymer matrices are performed. The simulations show that bare TPs tend to form clusters in the matrix of excess polymers. The clustering is significantly reduced after grafting polymer chains to the TPs, which is confirmed experimentally. Transmission electron microscopy reveals that the block copolymer-TP mixtures ("hybrids") show much better film qualities and TP distributions within the films when compared with the homopolymer-TP mixtures ("blends"), representing massive aggregations and cracks in the films. This grafting-to approach for the modification of TPs significantly improves the Dispersion of the TPs in matrices of "excess" polymers up to the arm length of 100 nm.
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Strategy for Good Dispersion of Well‐Defined Tetrapods in Semiconducting Polymer Matrices
Macromolecular rapid communications, 2014Co-Authors: Jaehoon Lim, Lisa Zur Borg, Stefan Dolezel, Friederike Schmid, Kookheon Char, Rudolf ZentelAbstract:The morphology or Dispersion control in inorganic/organic hybrid systems is studied, which consist of monodisperse CdSe tetrapods (TPs) with grafted semiconducting block copolymers with excess polymers of the same type. Tetrapod arm-length and amount of polymer loading are varied in order to find the ideal morphology for hybrid solar cells. Additionally, polymers without anchor groups are mixed with the TPs to study the effect of such anchor groups on the hybrid morphology. A numerical model is developed and Monte Carlo simulations to study the basis of compatibility or dispersibility of TPs in polymer matrices are performed. The simulations show that bare TPs tend to form clusters in the matrix of excess polymers. The clustering is significantly reduced after grafting polymer chains to the TPs, which is confirmed experimentally. Transmission electron microscopy reveals that the block copolymer-TP mixtures ("hybrids") show much better film qualities and TP distributions within the films when compared with the homopolymer-TP mixtures ("blends"), representing massive aggregations and cracks in the films. This grafting-to approach for the modification of TPs significantly improves the Dispersion of the TPs in matrices of "excess" polymers up to the arm length of 100 nm.
Zhihai Song - One of the best experts on this subject based on the ideXlab platform.
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Good Dispersion of hydrophilic nanoscale silica in rubber matrix and the effects on rubber nanocomposites
Science China-technological Sciences, 2012Co-Authors: Qingguo Wang, Liqun Zhang, Jinliang Qiao, Xiaohong Zhang, Zhihai SongAbstract:Using the industrial technologies of rubber latex irradiation, preparation of nanoscale silica (SiO2) slurry, mixing irradiated rubber latex with SiO2 slurry, and the spray drying, we have prepared the ultrafine fully-vulcanized powder carboxyl styrene-butadiene rubber (UFPCSBR)/SiO2 nanocompound powder, in which the SiO2 particles and UFPCSBR particles are isolated and stuck each other. When the UFPCSBR/SiO2 nanocompound powder is mixed with crude rubber, the UFPCSBR particles are dispersed well in rubber matrix because of their Good compatibility, then the SiO2 particles are also dispersed well in rubber matrix because of the carrier nature of the UFPCSBR particles during the mixing procedure, and the novel rubber/UFPCSBR/SiO2 nanocomposites are fabricated. Compared with the rubber composites prepared by mixing the crude rubber with the UFPCSBR powder and SiO2 powder one after the other, the novel UFPCSBR/SiO2 nanocompound modified rubber/ UFPCSBR/SiO2 nanocomposites have better abrasion resistance, higher tensile strength and tear strength, and lower heat build-up data. Noteworthily, the tanδ-temperature curve of the novel rubber/UFPCSBR/SiO2 nanocomposites has the second tanδ peak due to the newly generated boundary layer surrounding the SiO2 particles, increasing the tanδ values in the temperature range of 0–20°C, which is very important to the research of green tyre tread.
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Good Dispersion of hydrophilic nanoscale calcium carbonate particles in nitrile butadiene rubber matrix
Polymer, 2011Co-Authors: Qingguo Wang, Jinliang Qiao, Liqun Zhang, Xiaohong Zhang, Qingmei Song, Zhihai SongAbstract:Using the industrial technologies of rubber latex irradiation, hydrophilic nanoscale calcium carbonate (HNCC) slurry preparing and spray drying, we have prepared a novel ultrafine full-vulcanized powder nitrile butadiene rubber (UFPNBR)/HNCC nanocompound, in which the UFPNBR particles and HNCC particles are isolated and adhered to each other. When the UFPNBR/HNCC nanocompound powder is mixed with crude NBR, UFPNBR particles are easily dispersed well in NBR matrix because of their Good compatibility, thus the HNCC particles are also dispersed in NBR matrix because of the carrier aidance of UFPNBR particles in 7 phr HNCC loading range, then the novel NBR/UFPNBR/HNCC ternary nanocomposites is fabricated. Compared with NBR/organic reagent-treated HNCC (ONCC) binary composites, the NBR/UFPNBR/HNCC ternary nanocomposites has shorter vulcanization time and better properties of abrasive resistance, oil resistance, dynamic compression properties and flame retardancy in fire.
Hern Kim - One of the best experts on this subject based on the ideXlab platform.
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Fabrication of Poly(vinylidene fluoride) (PVDF) Nanofibers Containing Nickel Nanoparticles as Future Energy Server Materials.
Science of advanced materials, 2011Co-Authors: Faheem A. Sheikh, Travis Cantu, Javier Macossay, Hern KimAbstract:In the present study, we introduce Poly(vinylidene fluoride) (PVDF) nanofibers containing nickel (Ni) nanoparticles (NPs) as a result of an electrospinning. Typically, a colloidal solution consisting of PVDF/Ni NPs was prepared to produce nanofibers embedded with solid NPs by electrospinning process. The resultant nanostructures were studied by SEM analyses, which confirmed well oriented nanofibers and Good Dispersion of Ni NPs over them. The XRD results demonstrated well crystalline feature of PVDF and Ni in the obtained nanostructures. Physiochemical aspects of prepared nano-structures were characterized for TEM which confirmed nanofibers were well-oriented and had Good Dispersion of Ni NPs. Furthermore, the prepared nano-structures were studied for hydrogen production applications. Due to high surface to volume ratio of nanofibers form than the thin film ones, there was tremendous increase in the rate of hydrogen production. Overall, results satisfactorily confirmed the use of these materials in hydrogen production.
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Fabrication of titanium dioxide nanofibers containing hydroxyapatite nanoparticles
Applied Surface Science, 2010Co-Authors: Faheem A. Sheikh, Muzafar A. Kanjwal, Hak Yong Kim, Hern KimAbstract:Abstract In the present study, we introduce titanium dioxide (TiO2) nanofibers that contain hydroxyapatite (HAp) nanoparticles (NPs) as a result of an electrospinning process. A simple method that does not depend on additional foreign chemicals has been employed to synthesize HAp NPs through calcination of bovine bones. Typically, a colloidal gel consisting of titanium isopropoxide/HAp was prepared to produce nanofibers embedded with solid NPs by electrospinning process. The SEM results confirmed well oriented nanofibers and Good Dispersion of HAp NPs over the nanofibers. XRD results demonstrated well crystalline feature of both TiO2 and HAp. Physiochemical aspects of prepared nanofibers were characterized for TEM and TEM–EDS which confirmed nanofibers were well oriented and had Good Dispersion of HAp NPs. Accordingly, these results strongly recommend the use of obtained nanofiber mats as a future candidate for hard tissue engineering applications.
J.-b. Ducros - One of the best experts on this subject based on the ideXlab platform.
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Ionic and electronic conductivities in carbon nanotubes - ionogel solid device
Journal of Materials Chemistry, 2011Co-Authors: J.-b. Ducros, N. Buchtova, A. Magrez, Olivier Chauvet, Jean Le BideauAbstract:Easy immobilisation of carbon nanofillers in a solid state device featuring mesopores filled with ionic liquid (IL) is presented. Such a route allows a Good Dispersion of carbon nanotubes (CNTs) and carbon fibers in N-methyl-N-propylpyrrolidinium bis(trifluoromethanesulfonyl)imide, subsequently followed by the confinement of the whole within a porous silica matrix. We thus obtain herein a new type of hybrid ionogel within a solid device containing a percolating IL network as its real liquid state, as well as presenting a percolating carbon network. The process is carried out within a single step, without any chemistry for covalent grafting. We show that an IL with a non π-conjugated cation allows Good Dispersion of the carbon nanotubes, with a subsequent percolation for a loading level lower than 3.6 wt%. Together with the dynamic IL properties of ionogels, we thus present herein an inorganic-solid host containing carbon nanofillers, which gives the solid device ionic and electronic conductivities.
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Ionic and electronic conductivities in carbon nanotubes – ionogel solid device
J. Mater. Chem., 2011Co-Authors: J.-b. Ducros, N. Buchtova, A. Magrez, Olivier Chauvet, Jean Le BideauAbstract:Easy immobilisation of carbon nanofillers in a solid state device featuring mesopores filled with ionic liquid (IL) is presented. Such a route allows a Good Dispersion of carbon nanotubes (CNTs) and carbon fibers in N-methyl-N-propylpyrrolidinium bis(trifluoromethanesulfonyl)imide, subsequently followed by the confinement of the whole within a porous silica matrix. We thus obtain herein a new type of hybrid ionogel within a solid device containing a percolating IL network as its real liquid state, as well as presenting a percolating carbon network. The process is carried out within a single step, without any chemistry for covalent grafting. We show that an IL with a non π-conjugated cation allows Good Dispersion of the carbon nanotubes, with a subsequent percolation for a loading level lower than 3.6 wt%. Together with the dynamic IL properties of ionogels, we thus present herein an inorganic-solid host containing carbon nanofillers, which gives the solid device ionic and electronic conductivities.