TEM observation of hydrogen permeable Si-M-O (M = Ni or Sc) membranes synthesized on mesoporous anodic alumina capillary tubes

Yamazaki, Satoshi; Uno, Naoki; Mori, Hiroshi; Ikuhara, Y.; Iwamoto, Yuji; Kato, Takumi; Hirayama, Tsukasa

doi:10.1007/s10853-006-7870-3

Cited by 8 publications

(11 citation statements)

References 16 publications

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“…1. The TEM micrograph reveals that Ni nanoparticles with dark contrast were highly dispersed in a Si–Ni–O membrane 23 . The results of our previous study on the evaluation of high‐temperature hydrogen permselectivity of the novel nanocomposite membranes are plotted in Fig.…”

Section: Introductionmentioning

confidence: 95%

“…Based on the design concept mentioned above, Ni was used as a transition metal with high hydrogen affinity 21,22 . The Ni nanoparticle‐dispersed amorphous Si–O membranes were successfully fabricated on a mesoporous anodic alumina capillary (MAAC) tube using chemical processing techniques 20,23 . The MAAC tube was prepared by a novel pulse sequential anodic oxidation technique 24 .…”

Section: Introductionmentioning

confidence: 99%

“…By changing the pulse voltage in steps, a free‐standing MAAC tube composed of amorphous alumina with four layers having highly oriented radial mesopore channels was formed. The channel pore diameters of the four layers from the inner to the outer surface of the MAAC tube were controlled to be approximately 50, 16, 6, and 3 nm, respectively 23,24 …”

Section: Introductionmentioning

confidence: 99%

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High‐Temperature Hydrogen Adsorption Properties of Precursor‐Derived Nickel Nanoparticle‐Dispersed Amorphous Silica

Ikuhara

Mori

Saito

et al. 2007

Journal of the American Ceramic Society

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Nickel (Ni) nanoparticle-dispersed amorphous silica (Si-O) powders were synthesized from chemical solution precursors. The high-temperature hydrogen adsorption property of the precursor-derived composite powders was investigated in comparison with the amorphous Si-O and Ni at 773 K. Among the three powder samples, Ni nanoparticle-dispersed amorphous Si-O exhibited a unique reversible hydrogen adsorption property that was hardly detected on the amorphous Si-O and Ni. The increase amount of the reversibly adsorbed hydrogen was the highest for the composite samples at around the Ni content with a Ni/(Si1Ni) ratio of 0.2-0.3. The results strongly suggested that when the composite material is used in the form of a gas separation membrane, the reversibly adsorbed hydrogen property is thought to contribute to the additional increase in the number of solubility sites for hydrogen, which leads to a selective enhancement in the high-temperature hydrogen permeance at 773 K.

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Section: Introductionmentioning

confidence: 95%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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High‐Temperature Hydrogen Adsorption Properties of Precursor‐Derived Nickel Nanoparticle‐Dispersed Amorphous Silica

Ikuhara

Mori

Saito

et al. 2007

Journal of the American Ceramic Society

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“…The permeance of hydrogen was measured for the Ni nanoparticle‐dispersed amorphous Si–O membranes fabricated on a mesoporous anodic alumina capillary tube . The amount of reversibly adsorbed hydrogen of the prepared powder was measured using an automated gas sorption system (Quantachrome Autosorb‐1C: Quantachrome Instruments, Boynton Beach, FL) The range of hydrogen pressure for the 500°C isotherm analysis in this study was selected as 5–101 kPa, which closely corresponded with the hydrogen pressure difference between the permeable side and the feed side used in measurements of hydrogen gas permeance through the Ni nanoparticle‐dispersed amorphous silica membranes at 500°C.…”

Section: Methodsmentioning

confidence: 99%

“…A sol–gel precursor method using alkoxysilanes and a metal salt solution offers an alternative route for preparing composites with greater control over the final microstructure . We have previously reported the synthesis of nickel–silica composite membranes using this technique, with the resulting nanocomposite membranes exhibiting high hydrogen permeance . The reason for the enhanced H 2 permselectivity of the membranes is thought to be a result of reversible hydrogen adsorption at Ni particles, with the adsorption sites located predominantly at interfaces between Ni particles and the SiO 2 matrix .…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Microstructural Analysis of Homogeneously Dispersed Nickel Nanoparticles in Amorphous Silica

et al. 2011

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Silica containing uniformly dispersed Ni nanoparticles has been synthesized by a precursor solution method, involving heat treatment and reduction stages, and the transformation of the Si–Ni–O precursor into the composite powder has been investigated systematically to determine the formation mechanism of the nanoparticles. During heat treatment, nickel oxide nanoparticles are found to form simultaneously with the Si–O network, as decomposition of the alkoxy ligand and nucleation of NiO nanoparticles, both occur at around 300°C. The formation of ionically bound Si–Oδ−–Niδ+ units plays a key role in anchoring the NiO in the Si–O network and impeding further crystalline growth. Moreover, the formation of the Si–O2−–Ni2+ interactions in the composite of dispersed NiO in SiO retard the reduction of NiO, resulting in a characteristic microstructure consisting of highly dispersed metallic Ni nanoparticles within an Si–O matrix. This nickel–silica composite is expected to show enhanced reversible hydrogen adsorption, making it attractive for use in separation membranes with high hydrogen selectivity.

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High-Temperature Stability and Saturation Magnetization of Superparamagnetic Nickel Nanoparticles in Microporous Polysilazane-Derived Ceramics and their Gas Permeation Properties

Bazarjani

Müller

Kleebe

et al. 2014

ACS Appl. Mater. Interfaces

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Superparamagnetic Ni nanoparticles with diameters of about 3 nm are formed in situ at room temperature in a polysilazane matrix, forming Ni/polysilazane nanocomposite, in the reaction between a polysilazane and trans-bis(aceto-kO)bis(2-aminoethanol-k(2)N,O)nickel(II). The thermolysis of the Ni/polysilazane nanocomposite at 700 °C in an argon atmosphere results in a microporous superparamagnetic Ni/silicon oxycarbonitride (Ni/SiCNO) ceramic nanocomposite. The growth of Ni nanoparticles in Ni/SiCNO ceramic nanocomposite is totally suppressed even after thermolysis at 700 °C, as confirmed by HRTEM and SQUID characterizations. The analysis of saturation magnetization of Ni nanoparticles in Ni/polysilazane and Ni/SiCNO nanocomposites indicates that the saturation magnetization of Ni nanoparticles is higher than expected values and infers that the surfaces of Ni nanoparticles are not oxidized. The microporous superparamagnetic Ni/SiCNO nanocomposite is shaped as a free-standing monolith and foam. In addition, Ni/SiCNO membranes are fabricated by the dip-coating of a tubular alumina substrate in a dispersion of Ni/polysilazane in THF followed by a thermolysis at 700 °C under an argon atmosphere. The gas separation performance of Ni/SiCNO membranes at 25 and 300 °C is assessed by the single gas permeance (pressure rise technique) using He, H2, CO2, N2, CH4, n-propene, n-propane, n-butene, n-butane, and SF6 as probe molecules. After hydrothermal treatment, the higher increase in the hydrogen permeance compared to the permeance of other gases as a function of temperature indicates that the hydrogen affinity of Ni nanoparticles influences the transport of hydrogen in the Ni/SiCNO membrane and Ni nanoparticles stabilize the structure against hydrothermal corrosion.

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TEM observation of hydrogen permeable Si-M-O (M = Ni or Sc) membranes synthesized on mesoporous anodic alumina capillary tubes

Cited by 8 publications

References 16 publications

High‐Temperature Hydrogen Adsorption Properties of Precursor‐Derived Nickel Nanoparticle‐Dispersed Amorphous Silica

High‐Temperature Hydrogen Adsorption Properties of Precursor‐Derived Nickel Nanoparticle‐Dispersed Amorphous Silica

Synthesis and Microstructural Analysis of Homogeneously Dispersed Nickel Nanoparticles in Amorphous Silica

High-Temperature Stability and Saturation Magnetization of Superparamagnetic Nickel Nanoparticles in Microporous Polysilazane-Derived Ceramics and their Gas Permeation Properties

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