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Jin-wu Jiang - One of the best experts on this subject based on the ideXlab platform.

  • Effect of Interlayer Space on the structure and Poisson's ratio of a graphene/MoS2 tubular van der Waals heterostructure
    Journal of Applied Physics, 2018
    Co-Authors: Ya-wen Tan, Jin-wu Jiang
    Abstract:

    We propose a tubular van der Waals heterostructure by rolling up graphene and MoS2 atomic layers into a tubular form. We show that the Interlayer Space of this heterostructure can be varied in a specific range. This specific range is related to the Interlayer van der Waals force, the ultrahigh in-plane stiffness and small bending modulus of graphene, and the brittle characteristic properties of MoS2. This variability of the Interlayer Space can be utilized to efficiently tune the mechanical properties of the tubular van der Waals heterostructure. More specifically, we demonstrate that the Poisson's ratio of the tubular van der Waals heterostructure can be manipulated by a factor of two by varying the Interlayer Space in the range 1.44–4.44 A. This work provides a basis for applications of a new member of the van der Waals heterostructure family with a tunable Poisson's ratio.We propose a tubular van der Waals heterostructure by rolling up graphene and MoS2 atomic layers into a tubular form. We show that the Interlayer Space of this heterostructure can be varied in a specific range. This specific range is related to the Interlayer van der Waals force, the ultrahigh in-plane stiffness and small bending modulus of graphene, and the brittle characteristic properties of MoS2. This variability of the Interlayer Space can be utilized to efficiently tune the mechanical properties of the tubular van der Waals heterostructure. More specifically, we demonstrate that the Poisson's ratio of the tubular van der Waals heterostructure can be manipulated by a factor of two by varying the Interlayer Space in the range 1.44–4.44 A. This work provides a basis for applications of a new member of the van der Waals heterostructure family with a tunable Poisson's ratio.

  • effect of Interlayer Space on the structure and poisson s ratio of a graphene mos2 tubular van der waals heterostructure
    Journal of Applied Physics, 2018
    Co-Authors: Ya-wen Tan, Jin-wu Jiang
    Abstract:

    We propose a tubular van der Waals heterostructure by rolling up graphene and MoS2 atomic layers into a tubular form. We show that the Interlayer Space of this heterostructure can be varied in a specific range. This specific range is related to the Interlayer van der Waals force, the ultrahigh in-plane stiffness and small bending modulus of graphene, and the brittle characteristic properties of MoS2. This variability of the Interlayer Space can be utilized to efficiently tune the mechanical properties of the tubular van der Waals heterostructure. More specifically, we demonstrate that the Poisson's ratio of the tubular van der Waals heterostructure can be manipulated by a factor of two by varying the Interlayer Space in the range 1.44–4.44 A. This work provides a basis for applications of a new member of the van der Waals heterostructure family with a tunable Poisson's ratio.We propose a tubular van der Waals heterostructure by rolling up graphene and MoS2 atomic layers into a tubular form. We show that the Interlayer Space of this heterostructure can be varied in a specific range. This specific range is related to the Interlayer van der Waals force, the ultrahigh in-plane stiffness and small bending modulus of graphene, and the brittle characteristic properties of MoS2. This variability of the Interlayer Space can be utilized to efficiently tune the mechanical properties of the tubular van der Waals heterostructure. More specifically, we demonstrate that the Poisson's ratio of the tubular van der Waals heterostructure can be manipulated by a factor of two by varying the Interlayer Space in the range 1.44–4.44 A. This work provides a basis for applications of a new member of the van der Waals heterostructure family with a tunable Poisson's ratio.

Ya-wen Tan - One of the best experts on this subject based on the ideXlab platform.

  • Effect of Interlayer Space on the structure and Poisson's ratio of a graphene/MoS2 tubular van der Waals heterostructure
    Journal of Applied Physics, 2018
    Co-Authors: Ya-wen Tan, Jin-wu Jiang
    Abstract:

    We propose a tubular van der Waals heterostructure by rolling up graphene and MoS2 atomic layers into a tubular form. We show that the Interlayer Space of this heterostructure can be varied in a specific range. This specific range is related to the Interlayer van der Waals force, the ultrahigh in-plane stiffness and small bending modulus of graphene, and the brittle characteristic properties of MoS2. This variability of the Interlayer Space can be utilized to efficiently tune the mechanical properties of the tubular van der Waals heterostructure. More specifically, we demonstrate that the Poisson's ratio of the tubular van der Waals heterostructure can be manipulated by a factor of two by varying the Interlayer Space in the range 1.44–4.44 A. This work provides a basis for applications of a new member of the van der Waals heterostructure family with a tunable Poisson's ratio.We propose a tubular van der Waals heterostructure by rolling up graphene and MoS2 atomic layers into a tubular form. We show that the Interlayer Space of this heterostructure can be varied in a specific range. This specific range is related to the Interlayer van der Waals force, the ultrahigh in-plane stiffness and small bending modulus of graphene, and the brittle characteristic properties of MoS2. This variability of the Interlayer Space can be utilized to efficiently tune the mechanical properties of the tubular van der Waals heterostructure. More specifically, we demonstrate that the Poisson's ratio of the tubular van der Waals heterostructure can be manipulated by a factor of two by varying the Interlayer Space in the range 1.44–4.44 A. This work provides a basis for applications of a new member of the van der Waals heterostructure family with a tunable Poisson's ratio.

  • effect of Interlayer Space on the structure and poisson s ratio of a graphene mos2 tubular van der waals heterostructure
    Journal of Applied Physics, 2018
    Co-Authors: Ya-wen Tan, Jin-wu Jiang
    Abstract:

    We propose a tubular van der Waals heterostructure by rolling up graphene and MoS2 atomic layers into a tubular form. We show that the Interlayer Space of this heterostructure can be varied in a specific range. This specific range is related to the Interlayer van der Waals force, the ultrahigh in-plane stiffness and small bending modulus of graphene, and the brittle characteristic properties of MoS2. This variability of the Interlayer Space can be utilized to efficiently tune the mechanical properties of the tubular van der Waals heterostructure. More specifically, we demonstrate that the Poisson's ratio of the tubular van der Waals heterostructure can be manipulated by a factor of two by varying the Interlayer Space in the range 1.44–4.44 A. This work provides a basis for applications of a new member of the van der Waals heterostructure family with a tunable Poisson's ratio.We propose a tubular van der Waals heterostructure by rolling up graphene and MoS2 atomic layers into a tubular form. We show that the Interlayer Space of this heterostructure can be varied in a specific range. This specific range is related to the Interlayer van der Waals force, the ultrahigh in-plane stiffness and small bending modulus of graphene, and the brittle characteristic properties of MoS2. This variability of the Interlayer Space can be utilized to efficiently tune the mechanical properties of the tubular van der Waals heterostructure. More specifically, we demonstrate that the Poisson's ratio of the tubular van der Waals heterostructure can be manipulated by a factor of two by varying the Interlayer Space in the range 1.44–4.44 A. This work provides a basis for applications of a new member of the van der Waals heterostructure family with a tunable Poisson's ratio.

Makoto Ogawa - One of the best experts on this subject based on the ideXlab platform.

Gen-etsu Matsubayashi - One of the best experts on this subject based on the ideXlab platform.

  • Spin-Crossover Phenomena of Iron Complexes in the Montmorillonite Interlayer Space
    Molecular Crystals and Liquid Crystals, 1996
    Co-Authors: Motohiro Nakano, Gen-etsu Matsubayashi, Shoji Okuno, Wasuke Mori, Motomikatada
    Abstract:

    Abstract Spin-crossover phenomena of four iron complexes, [Fe(amp)3]2+ (amp = 2-(aminomethyl)pyridine), [Fe(acac2trien)]+ (H2acac2trien = N,N-bis(1- metnyl-3-oxobutylidene)triethylenetetramine), [Fe(sal2trien)] (H2sal2trien = N,N′- disalicylidenetriethylenetetramine), and [Fe(acpa)2] (Hacpa = N-acetyl-2-propylidene) −2-pyridylmethylamine), intercalating into the montmorillonite Interlayer Space were examined by the magnetic susceptibility measurement and 57Fe Mossbauer spectroscopy. Confinement of the complexes in the 2D Space brings some dispersion and drop of the spin-crossover temperature in comparison with those for their spin equilibria in solution. Twisting deformation of the complexes was proposed to be responsible for the observed variation of the relative stability between high-spin and low-spin species.

  • Intercalation of 2-, 4-sulfanylpyridine, 2,2'- and 4,4'-dithiobispyridine into VOPO4 and gel-V2O5 Interlayer Spaces
    J. Mater. Chem., 1996
    Co-Authors: Teruyuki Yatabe, Gen-etsu Matsubayashi
    Abstract:

    2-(2-Spy) and 4-sulfanylpyridine (4-Spy) have been inserted into the gel-V2O5 Interlayer Space, accompanied by oxidative S–S coupling, to form intercalation compounds including mostly N-protonated 2,2′-(2,2′-pySSpy) and 4,4′-dithiobipyridine (4,4′-pySSpy) moieties as a guest. 2,2′-pySSpy and 4,4′-pySSpy were also intercalated into the gel-V2O5 Interlayer Space to yield similar intercalation compounds. 2-Spy, 4-Spy and 4,4′-pySSpy formed no stable intercalation compounds with VOPO4 solids, while 2,2′-pySSpy was inserted into the VOPO4 lattice to afford an intercalation compound with fewer N-protonation sites. X-Ray diffraction patterns and X-ray photoelectron spectra of the intercalation compounds are discussed.

  • Intercalation of polymerized 3-methyl- and 3,4-dimethyl-pyrrole in the VOPO4 Interlayer Space
    Journal of Materials Chemistry, 1994
    Co-Authors: Hiroshi Nakajima, Gen-etsu Matsubayashi
    Abstract:

    3-Methylpyrrole (3-Mepyrr) and 3,4-dimethylpyrrole (3,4-Me2pyrr) react with powdered VOPO4·2H2O suspended in ethanol to yield intercalation compounds consisting of the reduced VOPO4 lattice and poly-3-Mepyrr or poly-3,4-Me2pyrr chains, VOPO4·(H2O)1.4(EtOH)0.2·(MeC4HNH)0.65 and VOPO4(H2O)1.8·(EtOH)0.2·(Me2C4NH)0.6. Poly-3-Mepyrr and poly-3,4-Me2pyrr moieties in the VOPO4 Interlayer Space afford single Interlayer spacings of 8.2 and 9.7 A, respectively Pyrrole (Pyrr) also reacts with VOPO4·2H2O solids suspended in ethanol to yield an oxidatively polymerized compound formed on the surface of the VOPO2 grains. Factors causing the polymerization of 3-Mepyrr and 3,4-Me2pyrr in the VOPO2 Interlayer Space and electronic interactions of the reduced VOPO4 host lattice with the intercalated poly-3-Mepyrr and poly-3,4-Me2 pyrr moieties are described based on powder X-ray diffraction patterns, infrared and X-ray photoelectron spectra together with theoretical calculations of molecular geometries and electron spin densities

  • Intercalation of Ferrocene and (Ferrocenylalkyl)ammonium Halides into the Gel-V2O5 Interlayer Space
    Bulletin of the Chemical Society of Japan, 1993
    Co-Authors: Shoji Okuno, Gen-etsu Matsubayashi
    Abstract:

    Ferrocene, FcH, 1,1′-dimethylferrocene, FcMe2, some (ferrocenylalkyl)ammonium iodides, Fc(CH2)nNR2R′+I−, chlorides, Fc(CH2)nNR2R′+Cl− [Fc = (C5H5)Fe(C5H4); n = 1 and 2; R, R′ = H and Me], benzyldimethyl-, benzyltrimethylammonium and octylammonium iodides reacted with powdered gel-V2O5 suspended in ethanol to afford intercalation compounds; V2O5·(H2O)0.6·[Fc+H]0.27, V2O5·(H2O)0.6·[Fc+Me2]0.22, V2O5·(H2O)0.6·[Fc+CH2NHMe2+]0.16, V2O5·(H2O)0.6·[Fc+CH2NMe3+]0.15, V2O5·(H2O)0.8·[Fc+CH2CH2NH3+]0.21, V2O5·(H2O)0.8·[Fc+CH2CH2NMe3+]0.14, V2O5·(H2O)0.6·[Fc+CH2NHMe2+]0.18, V2O5·(H2O)0.6·[Fc+CH2CH2NH3+]0.22, V2O5·(H2O)0.6·[PhCH2NHMe2+]0.29, V2O5·(H2O)0.6·[PhCH2NMe3+]0.24, and V2O5·(H2O)0.6·[n-C8H17NH3+]0.33. The intercalation compounds are constructed with layered V2O5 moieties in both V(IV) and V(V) states and the ferrocenium, the ferrocenium derivatives, the benzyldimethyl-, the benzyltrimethylammonium or the octylammonium cation in the Interlayer Space, producing the single V2O5-Interlayer spacings. Molecular arran...

  • Intercalation of ferrocene and its alkyl derivatives into the vanadyl phosphate Interlayer Space
    Inorganica Chimica Acta, 1991
    Co-Authors: Gen-etsu Matsubayashi, Seiji Ohta, Shoji Okuno
    Abstract:

    Abstract Ferrocene (Fc) and its alkyl-substituted derivatives (RFc; R=1,1′-Me 2 , Et, Bu n , HOCH 2 and HOCH 2 CH 2 ) intercalated into VOPO 4 ·H 2 O·EtOH in ethanol and EtOH/acetone to afford VOPO 4 ·H 2 O·(Fc + ) 0.35 , VOPO 4 ·H 2 O·(Me 2 Fc + ) 0.21 , VOPO 4 ·H 2 O·(EtFc + ) 0.19 , VOPO 4 ·H 2 O·(Bu n Fc + ) 0.08 , VOPO 4 ·H 2 0· (HOCH 2 FC + ) 0.23 and VOPO 4 ·H 2 O·(HOCH 2 CH 2 Fc + ) 0.31 , respectively (RFc + =the ferrocenium cation and its alkyl derivatives). The cobaltocenium cation (CoCp 2 + ) also intercalated into the VOPO 4 Interlayer Space in the presence of the iodide ion in ethanol to afford VOPO 4 ·H 2 O·(CoCp 2 + ) 0.52 . The intercalation compounds are constructed with layered VOPO 4 moieties in both V(IV) and V(V) states and the ferrocenium cation and its alkyl derivatives producing a single Interlayer spacing. Based on the Interlayer distances of the VOPO 4 moieties determined by the X-ray diffraction patterns, Fc + and Me 2 Fc + cations are concluded to be stably located in the VOPO 4 Interlayer Space, the cyclopentadienyl rings being approximately parallel to the layers at the first stage, followed by the change to an orientation perpendicular to the layers after a long period of standing. In contrast to this finding, the EtFc + and Bu n Fc + cations are stably located between the VOPO 4 layers, the rings being perpendicular to the layers. Electronic states of the VOPO 4 moieties and the guest molecules are discussed on the basis of ESR, IR, X-ray photoelectron, electronic absorption and reflectance spectra.

Eric Ferrage - One of the best experts on this subject based on the ideXlab platform.

  • cation diffusion in the Interlayer Space of swelling clay minerals a combined macroscopic and microscopic study
    Geochimica et Cosmochimica Acta, 2015
    Co-Authors: Emmanuel Tertre, Alfred Delville, Dimitri Prêt, Fabien Hubert, Eric Ferrage
    Abstract:

    This study investigates the diffusion process of calcium cations confined in the Interlayer Space of 5 mm disks of vermiculite swelling clay minerals during the Na-for-Ca exchange process. Diffusion experiments were performed at four NaCl salinities (3 x 10(-3) 3, 5 x 10(-2), 0.1 and 1 M) of the exchanger solution. A macroscopic analysis of the diffusion process based on the aqueous calcium concentrations released in the solution and on Ca-profiles obtained in the solid was performed using a pore diffusion model that has been classically used in the literature. The results obtained at the macroscopic scale showed that the apparent diffusion coefficients describing both aqueous and profiles data for Ca depend on the diffusion time and salinity of the aqueous reservoir. Such variations suggested that Interlayer diffusion was driven by (1) the gradient of the sorbed species in the Interlayer, which depends on the diffusion time due to the ion exchange equilibrium; and (2) the discontinuity, due to Donnan equilibrium, existing at the limit between the "internal disk border" and the "external disk border" in contact with the aqueous reservoir. Then, a set of molecular and Brownian dynamics simulations was used to (1) assess such interpretations and (2) quantitatively predict aqueous and profile data obtained at the macroscopic scale. For an aqueous reservoir with high salinity (1 M NaCl), a good agreement was obtained between the macroscopic data and the predictions obtained from Brownian dynamics simulations, confirming the role played by the gradient of the Interlayer species that is suggested at the macroscopic scale and which is at the basis of the "surface diffusion models" published in literature. In addition, for aqueous reservoirs with lower salinity (5 x 10(-2) M), the results obtained by Brownian dynamics simulations and normalized to the exchange rate measured at infinite time showed that the diffusion properties of the species in the aqueous reservoir cannot be neglected to correctly interpret macroscopic data. This behavior confirms the role played by the ionic flux that exists at the "disk border", which can limit the global diffusion process in a low salinity reservoir, even if it is well stirred. Moreover, by assuming a tortuosity equal to 1 for monocrystals, the self- diffusion coefficient issued from molecular dynamics simulations is in good agreement with the apparent diffusion coefficient describing macroscopic data when the gradient of sorbed concentrations within the solid is null; this latter condition is obtained in our case at infinite time (20 days) when the initial Ca- saturated disks are fully exchanged with Na cations. Finally, the use of monocrystals allows us to have only Interlayer porosity and then to obtain a self- diffusion coefficient for Ca from Molecular Dynamic simulations, which is in good agreement with Ca-surface mobility, which was defined by some authors to predict the "surface diffusion process" at the macroscopic scale.

  • Cation diffusion in the Interlayer Space of swelling clay minerals – A combined macroscopic and microscopic study
    Geochimica et Cosmochimica Acta, 2015
    Co-Authors: Emmanuel Tertre, Alfred Delville, Dimitri Prêt, Fabien Hubert, Eric Ferrage
    Abstract:

    This study investigates the diffusion process of calcium cations confined in the Interlayer Space of 5 mm disks of vermiculite swelling clay minerals during the Na-for-Ca exchange process. Diffusion experiments were performed at four NaCl salinities (3 x 10(-3) 3, 5 x 10(-2), 0.1 and 1 M) of the exchanger solution. A macroscopic analysis of the diffusion process based on the aqueous calcium concentrations released in the solution and on Ca-profiles obtained in the solid was performed using a pore diffusion model that has been classically used in the literature. The results obtained at the macroscopic scale showed that the apparent diffusion coefficients describing both aqueous and profiles data for Ca depend on the diffusion time and salinity of the aqueous reservoir. Such variations suggested that Interlayer diffusion was driven by (1) the gradient of the sorbed species in the Interlayer, which depends on the diffusion time due to the ion exchange equilibrium; and (2) the discontinuity, due to Donnan equilibrium, existing at the limit between the "internal disk border" and the "external disk border" in contact with the aqueous reservoir. Then, a set of molecular and Brownian dynamics simulations was used to (1) assess such interpretations and (2) quantitatively predict aqueous and profile data obtained at the macroscopic scale. For an aqueous reservoir with high salinity (1 M NaCl), a good agreement was obtained between the macroscopic data and the predictions obtained from Brownian dynamics simulations, confirming the role played by the gradient of the Interlayer species that is suggested at the macroscopic scale and which is at the basis of the "surface diffusion models" published in literature. In addition, for aqueous reservoirs with lower salinity (5 x 10(-2) M), the results obtained by Brownian dynamics simulations and normalized to the exchange rate measured at infinite time showed that the diffusion properties of the species in the aqueous reservoir cannot be neglected to correctly interpret macroscopic data. This behavior confirms the role played by the ionic flux that exists at the "disk border", which can limit the global diffusion process in a low salinity reservoir, even if it is well stirred. Moreover, by assuming a tortuosity equal to 1 for monocrystals, the self- diffusion coefficient issued from molecular dynamics simulations is in good agreement with the apparent diffusion coefficient describing macroscopic data when the gradient of sorbed concentrations within the solid is null; this latter condition is obtained in our case at infinite time (20 days) when the initial Ca- saturated disks are fully exchanged with Na cations. Finally, the use of monocrystals allows us to have only Interlayer porosity and then to obtain a self- diffusion coefficient for Ca from Molecular Dynamic simulations, which is in good agreement with Ca-surface mobility, which was defined by some authors to predict the "surface diffusion process" at the macroscopic scale.