The Experts below are selected from a list of 327 Experts worldwide ranked by ideXlab platform
Poul Norby - One of the best experts on this subject based on the ideXlab platform.
-
protonic titanate derived from csxti2 x 2mgx 2o4 x 0 7 with lepidocrocite type Layered Structure
Journal of Materials Chemistry, 2009Co-Authors: Helmer Fjellvåg, Poul NorbyAbstract:A Layered titanate CsxTi2−x/2Mgx/2O4 (x = 0.7) with lepidocrocite (γ-FeOOH)-type Layered Structure was prepared via solid-state reaction. Extraction of both Mg2+ ions in the host layers and interlayer Cs+ ions was achieved during an acid-exchange process, producing a new protonic titanate HxTi2−x/2O4−x/2·H2O. This phase was distinguished from isomorphous related compounds in terms of removable lattice Mg and O atoms. The protonic titanate HxTi2−x/2O4−x/2·H2O showed excellent exfoliation/delamination reactivity upon intercalating organic amine ions as well as the ability to produce single two-dimensional titanate nanosheets with small thickness of about 1 nm. These findings offered a new clue for understanding the physicochemical properties of lattice dopants in lepidocrocite titanates.
-
raman scattering properties of a protonic titanate hxti2 x 4 x 4o4 h2o vacancy x 0 7 with lepidocrocite type Layered Structure
Journal of Physical Chemistry B, 2008Co-Authors: Helmer Fjellvåg, Poul NorbyAbstract:Raman scattering spectroscopy is employed to characterize a Layered titanate HxTi2-x/4◻x/4O4·H2O (◻: vacancy; x = 0.7) with lepidocrocite (γ-FeOOH)-type Layered Structure. Nine Raman lines corresponding to (3Ag + 3B1g + 3B3g) Raman-active modes expected from this orthorhombic Structure (space group D2h25-Immm) are recorded at 183, 270, 387, 449, 558, 658, 704, 803, and 908 cm−1, which are assigned to Ti−O lattice vibrations within the two-dimensional (2D) lepidocrocite-type TiO6 octahedral host layers. These intrinsic Raman bands present a clear signature that can be used for probing the protonic titanate HxTi2-x/4◻x/4O4·H2O and the 2D titanate nanosheets, as well as their corresponding derivates.
-
Raman scattering properties of a protonic titanate HxTi2-x/4[symbol: see text]x/4O4.H2O ([symbol: see text], vacancy; x=0.7) with lepidocrocite-type Layered Structure.
The journal of physical chemistry. B, 2008Co-Authors: Tao Gao, Helmer Fjellvåg, Poul NorbyAbstract:Raman scattering spectroscopy is employed to characterize a Layered titanate HxTi2-x/4[symbol: see text]x/4O4.H2O ([symbol: see text]: vacancy; x=0.7) with lepidocrocite (gamma-FeOOH)-type Layered Structure. Nine Raman lines corresponding to (3Ag+3B1g+3B3g) Raman-active modes expected from this orthorhombic Structure (space group D2h25-Immm) are recorded at 183, 270, 387, 449, 558, 658, 704, 803, and 908 cm(-1), which are assigned to Ti-O lattice vibrations within the two-dimensional (2D) lepidocrocite-type TiO6 octahedral host layers. These intrinsic Raman bands present a clear signature that can be used for probing the protonic titanate HxTi2-x/4[symbol: see text]x/4O4.H2O and the 2D titanate nanosheets, as well as their corresponding derivates.
P. Chen - One of the best experts on this subject based on the ideXlab platform.
-
a novel nano sulfur polypyrrole graphene nanocomposite cathode with a dual Layered Structure for lithium rechargeable batteries
Journal of Power Sources, 2013Co-Authors: Yongguang Zhang, Denise Gosselink, Hayden Greentree Soboleski, Aishuak Konarov, Yan Zhao, P. ChenAbstract:Abstract A method for synthesizing nano-sulfur/polypyrrole/graphene nanosheet (nano-S/PPy/GNS) ternary composite with a dual-Layered Structure is described. By taking advantage of both capillary force driven self-assembly of polypyrrole on graphene nanosheets and adhesion ability of polypyrrole to sulfur, we develop a stable and ordered nano-S/PPy/GNS composite cathode for lithium/sulfur (Li/S) batteries. The high dispersion of nanoscopic sulfur on the surface of PPy/GNS composite and good electrical conductivity of GNS seems to benefit the sulfur utilization and the reactivity of the composite. Furthermore, PPy plays an important role in retarding diffusion of polysulfides out of the electrode. The resulting nano-S/PPy/GNS composite cathode delivers a high initial capacity of 1415.7 mAh g −1 , remaining a reversible capacity of 641.5 mAh g −1 after 40 cycles at 0.1 C rate.
-
A novel nano-sulfur/polypyrrole/graphene nanocomposite cathode with a dual-Layered Structure for lithium rechargeable batteries
Journal of Power Sources, 2013Co-Authors: Yongguang Zhang, Denise Gosselink, Hayden Greentree Soboleski, Aishuak Konarov, Yan Zhao, P. ChenAbstract:A method for synthesizing nano-sulfur/polypyrrole/graphene nanosheet (nano-S/PPy/GNS) ternary composite with a dual-Layered Structure is described. By taking advantage of both capillary force driven self-assembly of polypyrrole on graphene nanosheets and adhesion ability of polypyrrole to sulfur, we develop a stable and ordered nano-S/PPy/GNS composite cathode for lithium/sulfur (Li/S) batteries. The high dispersion of nanoscopic sulfur on the surface of PPy/GNS composite and good electrical conductivity of GNS seems to benefit the sulfur utilization and the reactivity of the composite. Furthermore, PPy plays an important role in retarding diffusion of polysulfides out of the electrode. The resulting nano-S/PPy/GNS composite cathode delivers a high initial capacity of 1415.7 mAh g-1, remaining a reversible capacity of 641.5 mAh g-1after 40 cycles at 0.1 C rate. © 2013 Elsevier B.V. All rights reserved.
Chun Li - One of the best experts on this subject based on the ideXlab platform.
-
strong and ductile poly vinyl alcohol graphene oxide composite films with a Layered Structure
Carbon, 2009Co-Authors: Yuxi Xu, Wenjing Hong, Chun LiAbstract:Abstract We report the preparation of mechanically strong and ductile poly(vinyl alcohol)/graphene oxide (GO) composite films with a Layered Structure simply by vacuum filtration. The Young’s modulus and tensile yield strength of the composite film containing 3 wt.% GO were measured to be 4.8 GPa and 110 ± 7 MPa, respectively. Furthermore, it is flexible and exhibits a large elongation at break (36 ± 4%). The high mechanical properties of the composite films are mainly due to the homogeneous dispersion and alignment of GO sheets in the polymer matrix and strong interfacial interactions between both components.
-
Strong and ductile poly(vinyl alcohol)/graphene oxide composite films with a Layered Structure
Carbon, 2009Co-Authors: Yuxi Xu, Wenjing Hong, Hua Bai, Chun Li, Gaoquan ShiAbstract:We report the preparation of mechanically strong and ductile poly(vinyl alcohol)/graphene oxide (GO) composite films with a Layered Structure simply by vacuum filtration. The Young's modulus and tensile yield strength of the composite film containing 3 wt.% GO were measured to be 4.8 GPa and 110 ± 7 MPa, respectively. Furthermore, it is flexible and exhibits a large elongation at break (36 ± 4%). The high mechanical properties of the composite films are mainly due to the homogeneous dispersion and alignment of GO sheets in the polymer matrix and strong interfacial interactions between both components. © 2009 Elsevier Ltd. All rights reserved.
Yuxi Xu - One of the best experts on this subject based on the ideXlab platform.
-
strong and ductile poly vinyl alcohol graphene oxide composite films with a Layered Structure
Carbon, 2009Co-Authors: Yuxi Xu, Wenjing Hong, Chun LiAbstract:Abstract We report the preparation of mechanically strong and ductile poly(vinyl alcohol)/graphene oxide (GO) composite films with a Layered Structure simply by vacuum filtration. The Young’s modulus and tensile yield strength of the composite film containing 3 wt.% GO were measured to be 4.8 GPa and 110 ± 7 MPa, respectively. Furthermore, it is flexible and exhibits a large elongation at break (36 ± 4%). The high mechanical properties of the composite films are mainly due to the homogeneous dispersion and alignment of GO sheets in the polymer matrix and strong interfacial interactions between both components.
-
Strong and ductile poly(vinyl alcohol)/graphene oxide composite films with a Layered Structure
Carbon, 2009Co-Authors: Yuxi Xu, Wenjing Hong, Hua Bai, Chun Li, Gaoquan ShiAbstract:We report the preparation of mechanically strong and ductile poly(vinyl alcohol)/graphene oxide (GO) composite films with a Layered Structure simply by vacuum filtration. The Young's modulus and tensile yield strength of the composite film containing 3 wt.% GO were measured to be 4.8 GPa and 110 ± 7 MPa, respectively. Furthermore, it is flexible and exhibits a large elongation at break (36 ± 4%). The high mechanical properties of the composite films are mainly due to the homogeneous dispersion and alignment of GO sheets in the polymer matrix and strong interfacial interactions between both components. © 2009 Elsevier Ltd. All rights reserved.
Helmer Fjellvåg - One of the best experts on this subject based on the ideXlab platform.
-
protonic titanate derived from csxti2 x 2mgx 2o4 x 0 7 with lepidocrocite type Layered Structure
Journal of Materials Chemistry, 2009Co-Authors: Helmer Fjellvåg, Poul NorbyAbstract:A Layered titanate CsxTi2−x/2Mgx/2O4 (x = 0.7) with lepidocrocite (γ-FeOOH)-type Layered Structure was prepared via solid-state reaction. Extraction of both Mg2+ ions in the host layers and interlayer Cs+ ions was achieved during an acid-exchange process, producing a new protonic titanate HxTi2−x/2O4−x/2·H2O. This phase was distinguished from isomorphous related compounds in terms of removable lattice Mg and O atoms. The protonic titanate HxTi2−x/2O4−x/2·H2O showed excellent exfoliation/delamination reactivity upon intercalating organic amine ions as well as the ability to produce single two-dimensional titanate nanosheets with small thickness of about 1 nm. These findings offered a new clue for understanding the physicochemical properties of lattice dopants in lepidocrocite titanates.
-
raman scattering properties of a protonic titanate hxti2 x 4 x 4o4 h2o vacancy x 0 7 with lepidocrocite type Layered Structure
Journal of Physical Chemistry B, 2008Co-Authors: Helmer Fjellvåg, Poul NorbyAbstract:Raman scattering spectroscopy is employed to characterize a Layered titanate HxTi2-x/4◻x/4O4·H2O (◻: vacancy; x = 0.7) with lepidocrocite (γ-FeOOH)-type Layered Structure. Nine Raman lines corresponding to (3Ag + 3B1g + 3B3g) Raman-active modes expected from this orthorhombic Structure (space group D2h25-Immm) are recorded at 183, 270, 387, 449, 558, 658, 704, 803, and 908 cm−1, which are assigned to Ti−O lattice vibrations within the two-dimensional (2D) lepidocrocite-type TiO6 octahedral host layers. These intrinsic Raman bands present a clear signature that can be used for probing the protonic titanate HxTi2-x/4◻x/4O4·H2O and the 2D titanate nanosheets, as well as their corresponding derivates.
-
Raman scattering properties of a protonic titanate HxTi2-x/4[symbol: see text]x/4O4.H2O ([symbol: see text], vacancy; x=0.7) with lepidocrocite-type Layered Structure.
The journal of physical chemistry. B, 2008Co-Authors: Tao Gao, Helmer Fjellvåg, Poul NorbyAbstract:Raman scattering spectroscopy is employed to characterize a Layered titanate HxTi2-x/4[symbol: see text]x/4O4.H2O ([symbol: see text]: vacancy; x=0.7) with lepidocrocite (gamma-FeOOH)-type Layered Structure. Nine Raman lines corresponding to (3Ag+3B1g+3B3g) Raman-active modes expected from this orthorhombic Structure (space group D2h25-Immm) are recorded at 183, 270, 387, 449, 558, 658, 704, 803, and 908 cm(-1), which are assigned to Ti-O lattice vibrations within the two-dimensional (2D) lepidocrocite-type TiO6 octahedral host layers. These intrinsic Raman bands present a clear signature that can be used for probing the protonic titanate HxTi2-x/4[symbol: see text]x/4O4.H2O and the 2D titanate nanosheets, as well as their corresponding derivates.
