The Experts below are selected from a list of 1341 Experts worldwide ranked by ideXlab platform

Kazuyuki Kakegawa - One of the best experts on this subject based on the ideXlab platform.

  • effect of Alkali Metal Hydroxide on formation processes of zinc oxide crystallites from aqueous solutions containing zn oh 42 ions
    Physical Chemistry Chemical Physics, 2004
    Co-Authors: Naofumi Uekawa, Ryo Yamashita, Kazuyuki Kakegawa
    Abstract:

    Aqueous solutions containing Zn(OH)42− ions were prepared by adding 50 ml of 1.5 mol l−1 aqueous Alkali Metal Hydroxide (MOH: M = Li, Na, K, Cs) to 50 ml of 0.1 mol l−1 aqueous zinc nitrate hydrate (Zn(NO3)2·6H2O). Zinc oxide (ZnO) crystallites were obtained by heating aqueous solutions containing Zn(OH)42− ions at ≥348 or 368 K for 3 h. The morphology depended on both of the heating temperature of the Zn(OH)42− aqueous solution and the Alkali Metal Hydroxide used to obtain Zn(OH)42− ions. According to the result of the kinetics of the zinc oxide formation, it was shown that the decomposition of Zn(OH)42− ions on the zinc oxide surface was the rate determining step when NaOH, KOH and CsOH were used to obtain Zn(OH)42− ions. When LiOH was used to obtain Zn(OH)42− ions, the rate determining step was the nucleation of zinc oxide and/or the adsorption of Zn(OH)42− ions.

  • Effect of Alkali Metal Hydroxide on formation processes of zinc oxide crystallites from aqueous solutions containing Zn(OH)42− ions
    Physical Chemistry Chemical Physics, 2004
    Co-Authors: Naofumi Uekawa, Ryo Yamashita, Kazuyuki Kakegawa
    Abstract:

    Aqueous solutions containing Zn(OH)42− ions were prepared by adding 50 ml of 1.5 mol l−1 aqueous Alkali Metal Hydroxide (MOH: M = Li, Na, K, Cs) to 50 ml of 0.1 mol l−1 aqueous zinc nitrate hydrate (Zn(NO3)2·6H2O). Zinc oxide (ZnO) crystallites were obtained by heating aqueous solutions containing Zn(OH)42− ions at ≥348 or 368 K for 3 h. The morphology depended on both of the heating temperature of the Zn(OH)42− aqueous solution and the Alkali Metal Hydroxide used to obtain Zn(OH)42− ions. According to the result of the kinetics of the zinc oxide formation, it was shown that the decomposition of Zn(OH)42− ions on the zinc oxide surface was the rate determining step when NaOH, KOH and CsOH were used to obtain Zn(OH)42− ions. When LiOH was used to obtain Zn(OH)42− ions, the rate determining step was the nucleation of zinc oxide and/or the adsorption of Zn(OH)42− ions.

John B. Wiley - One of the best experts on this subject based on the ideXlab platform.

  • Topochemical Synthesis of Alkali-Metal Hydroxide Layers within Double- and Triple-Layered Perovskites.
    ChemInform, 2014
    Co-Authors: Dariush Montasserasadi, Debasish Mohanty, Ashfia Huq, Luke Heroux, E. A. Payzant, John B. Wiley
    Abstract:

    Alkali Metal Hydroxide layers within lamellar perovskites are formed by a two-step topochemical synthesis.

  • Topochemical synthesis of Alkali-Metal Hydroxide layers within double- and triple-layered perovskites.
    Inorganic chemistry, 2014
    Co-Authors: Dariush Montasserasadi, Debasish Mohanty, Ashfia Huq, Luke Heroux, E. A. Payzant, John B. Wiley
    Abstract:

    The formation of Alkali-Metal Hydroxide layers within lamellar perovskites has been accomplished by a two-step topochemical reaction strategy. Reductive intercalation of ALaNb2O7 with Alkali Metal (A = K, Rb) and RbCa2Nb3O10 with Rb leads to A2LaNb2O7 and Rb2Ca2Nb3O10, respectively. Oxidative intercalation with stoichiometric amounts of water vapor, produced by the decomposition of calcium oxalate monohydrate in a sealed ampule, allows the insertion Hydroxide species. Compounds of the form (A2OH)LaNb2O7 (A = K, Rb) and (Rb2OH)Ca2Nb3O10 are accessible. X-ray diffraction data indicates a clear layer expansion of almost 3 A on the insertion of Hydroxide relative to that of the parent. Rietveld refinement of neutron diffraction data collected on deuterated samples of (Rb2OD)LaNb2O7 (P4/mmm space group, a = 3.9348(1) A, c = 14.7950(7) A) finds that both rubidium and oxygen species reside in cubic sites forming a CsCl-like interlayer structure between niobate perovskite blocks. Hydrogens, attached to the interl...

Naofumi Uekawa - One of the best experts on this subject based on the ideXlab platform.

  • effect of Alkali Metal Hydroxide on formation processes of zinc oxide crystallites from aqueous solutions containing zn oh 42 ions
    Physical Chemistry Chemical Physics, 2004
    Co-Authors: Naofumi Uekawa, Ryo Yamashita, Kazuyuki Kakegawa
    Abstract:

    Aqueous solutions containing Zn(OH)42− ions were prepared by adding 50 ml of 1.5 mol l−1 aqueous Alkali Metal Hydroxide (MOH: M = Li, Na, K, Cs) to 50 ml of 0.1 mol l−1 aqueous zinc nitrate hydrate (Zn(NO3)2·6H2O). Zinc oxide (ZnO) crystallites were obtained by heating aqueous solutions containing Zn(OH)42− ions at ≥348 or 368 K for 3 h. The morphology depended on both of the heating temperature of the Zn(OH)42− aqueous solution and the Alkali Metal Hydroxide used to obtain Zn(OH)42− ions. According to the result of the kinetics of the zinc oxide formation, it was shown that the decomposition of Zn(OH)42− ions on the zinc oxide surface was the rate determining step when NaOH, KOH and CsOH were used to obtain Zn(OH)42− ions. When LiOH was used to obtain Zn(OH)42− ions, the rate determining step was the nucleation of zinc oxide and/or the adsorption of Zn(OH)42− ions.

  • Effect of Alkali Metal Hydroxide on formation processes of zinc oxide crystallites from aqueous solutions containing Zn(OH)42− ions
    Physical Chemistry Chemical Physics, 2004
    Co-Authors: Naofumi Uekawa, Ryo Yamashita, Kazuyuki Kakegawa
    Abstract:

    Aqueous solutions containing Zn(OH)42− ions were prepared by adding 50 ml of 1.5 mol l−1 aqueous Alkali Metal Hydroxide (MOH: M = Li, Na, K, Cs) to 50 ml of 0.1 mol l−1 aqueous zinc nitrate hydrate (Zn(NO3)2·6H2O). Zinc oxide (ZnO) crystallites were obtained by heating aqueous solutions containing Zn(OH)42− ions at ≥348 or 368 K for 3 h. The morphology depended on both of the heating temperature of the Zn(OH)42− aqueous solution and the Alkali Metal Hydroxide used to obtain Zn(OH)42− ions. According to the result of the kinetics of the zinc oxide formation, it was shown that the decomposition of Zn(OH)42− ions on the zinc oxide surface was the rate determining step when NaOH, KOH and CsOH were used to obtain Zn(OH)42− ions. When LiOH was used to obtain Zn(OH)42− ions, the rate determining step was the nucleation of zinc oxide and/or the adsorption of Zn(OH)42− ions.

Lioubov Kiwi-minsker - One of the best experts on this subject based on the ideXlab platform.

  • Promotion Effect of Alkali Metal Hydroxides on Polymer-Stabilized Pd Nanoparticles for Selective Hydrogenation of C–C Triple Bonds in Alkynols
    Industrial & Engineering Chemistry Research, 2017
    Co-Authors: Linda Zh. Nikoshvili, Alexey V. Bykov, Tatiana E. Khudyakova, Thomas Lagrange, Florent Héroguel, Jeremy S. Luterbacher, Valentina G. Matveeva, Esther M. Sulman, Paul J. Dyson, Lioubov Kiwi-minsker
    Abstract:

    Postimpregnation of Pd nanoparticles (NPs) stabilized within hyper-cross-linked polystyrene with sodium or potassium Hydroxides of optimal concentration was found to significantly increase the catalytic activity for the partial hydrogenation of the C–C triple bond in 2-methyl-3-butyn-2-ol at ambient hydrogen pressure. The Alkali Metal Hydroxide accelerates the transformation of the residual Pd(II) salt into Pd(0) NPs and diminishes the reaction induction period. In addition, the selectivity to the desired 2-methyl-3-buten-2-ol increases with the K- and Na-doped catalysts from 97.0 up to 99.5%. This effect was assigned to interactions of the Alkali Metal ions with the Pd NPs surfaces resulting in the sites’ separation and a change of reactants adsorption.

  • Promotion Effect of Alkali Metal Hydroxides on Polymer-Stabilized Pd Nanoparticles for Selective Hydrogenation of C–C Triple Bonds in Alkynols
    2017
    Co-Authors: Linda Zh. Nikoshvili, Tatiana E. Khudyakova, Thomas Lagrange, Jeremy S. Luterbacher, Valentina G. Matveeva, Esther M. Sulman, Paul J. Dyson, Alexey V. Bykov, Florent Héroguel, Lioubov Kiwi-minsker
    Abstract:

    Postimpregnation of Pd nanoparticles (NPs) stabilized within hyper-cross-linked polystyrene with sodium or potassium Hydroxides of optimal concentration was found to significantly increase the catalytic activity for the partial hydrogenation of the C–C triple bond in 2-methyl-3-butyn-2-ol at ambient hydrogen pressure. The Alkali Metal Hydroxide accelerates the transformation of the residual Pd­(II) salt into Pd(0) NPs and diminishes the reaction induction period. In addition, the selectivity to the desired 2-methyl-3-buten-2-ol increases with the K- and Na-doped catalysts from 97.0 up to 99.5%. This effect was assigned to interactions of the Alkali Metal ions with the Pd NPs surfaces resulting in the sites’ separation and a change of reactants adsorption

Dariush Montasserasadi - One of the best experts on this subject based on the ideXlab platform.

  • Topochemical Synthesis of Alkali-Metal Hydroxide Layers within Double- and Triple-Layered Perovskites.
    ChemInform, 2014
    Co-Authors: Dariush Montasserasadi, Debasish Mohanty, Ashfia Huq, Luke Heroux, E. A. Payzant, John B. Wiley
    Abstract:

    Alkali Metal Hydroxide layers within lamellar perovskites are formed by a two-step topochemical synthesis.

  • Topochemical synthesis of Alkali-Metal Hydroxide layers within double- and triple-layered perovskites.
    Inorganic chemistry, 2014
    Co-Authors: Dariush Montasserasadi, Debasish Mohanty, Ashfia Huq, Luke Heroux, E. A. Payzant, John B. Wiley
    Abstract:

    The formation of Alkali-Metal Hydroxide layers within lamellar perovskites has been accomplished by a two-step topochemical reaction strategy. Reductive intercalation of ALaNb2O7 with Alkali Metal (A = K, Rb) and RbCa2Nb3O10 with Rb leads to A2LaNb2O7 and Rb2Ca2Nb3O10, respectively. Oxidative intercalation with stoichiometric amounts of water vapor, produced by the decomposition of calcium oxalate monohydrate in a sealed ampule, allows the insertion Hydroxide species. Compounds of the form (A2OH)LaNb2O7 (A = K, Rb) and (Rb2OH)Ca2Nb3O10 are accessible. X-ray diffraction data indicates a clear layer expansion of almost 3 A on the insertion of Hydroxide relative to that of the parent. Rietveld refinement of neutron diffraction data collected on deuterated samples of (Rb2OD)LaNb2O7 (P4/mmm space group, a = 3.9348(1) A, c = 14.7950(7) A) finds that both rubidium and oxygen species reside in cubic sites forming a CsCl-like interlayer structure between niobate perovskite blocks. Hydrogens, attached to the interl...