Characterization of synthetic imogolite nanotubes as gas storage

Ohashi, Fumihiko; Tomura, Shinji; Akaku, Kohei; Hayashi, Shigenobu; Wada, Shin Ichiro

doi:10.1023/b:jmsc.0000016188.04444.36

Cited by 68 publications

(54 citation statements)

References 12 publications

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“…Aluminum-rich allophanes (Al 2 O 3 ·xSiO 2 ·yH 2 O (x = 1; y = 2-5)) classified as protoimogolite or imogolite-like allophane [28] can have Al/Si ratios ranging from 2.3 to 2.7 [29], consistent with the observed range of 2.2 to 2.7. The observed XRD reflections are also common to imogolite, although there are additional imogolite reflections [30,31] that are absent in the XRD patterns. The additional peaks are also significantly less intense than the observed peaks and would be close to background in these samples.…”

Section: Xrd Analysis X-ray Powder Diffraction Patternsmentioning

confidence: 89%

The Effect of Dissolved Humic Acids on Aluminosilicate Formation and Associated Carbon Sequestration

Rouff

Phillips

Cochiara

et al. 2012

Applied and Environmental Soil Science

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Allophane and imogolite neogenesis in soils may occur in the presence of organic matter. To understand this process under conditions relevant to soils, the influence of dissolved organic carbon (DOC) as humic acid (HA), on aluminosilicate formation was studied at 25• C, pH 6, and low-DOC concentrations. For solutions with initial Al/Si ratios of 1-2.1, and 0-6 mg/L DOC, precipitates recovered after 20 h had Al/Si ratios of 2.2-2.7. The formation of allophane, imogolite-like material, and aluminosilicate gel was confirmed by XRD, FTIR, and NMR. The effect of DOC was to produce a small, but systematic increase in imogolite-like Si in the precipitate, and a decrease in the formation of aluminosilicate gel. Results suggest that the presence of DOC as HA slows the otherwise rapid polymerization of Al and Si at low temperature, and may also promote the formation of imogolite. The high C content of these precipitates indicates that this process may facilitate the sequestration of organic matter, slowing C cycling in soils.

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Section: Xrd Analysis X-ray Powder Diffraction Patternsmentioning

confidence: 89%

The Effect of Dissolved Humic Acids on Aluminosilicate Formation and Associated Carbon Sequestration

Rouff

Phillips

Cochiara

et al. 2012

Applied and Environmental Soil Science

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“…Both types of osteoblast showed high affinity to imogolite, which is expected to be useful for bioapplications such as the fabrication of scaffolds for cell cultures and surface modified implants. Journal of the Ceramic Society of Japan 118 [6] 516-520 2010…”

Section: Discussionmentioning

confidence: 99%

Osteoblastic cellular responses to aluminosilicate nanotubes, imogolite using Saos-2 and MC3T3-E1 cells

Ishikawa

Abe

Yawaka

et al. 2010

J. Ceram. Soc. Japan

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Imogolite is a naturally occurring hydrous aluminosilicate clay mineral. It has nano-tubular structure similar to that of single-walled carbon nanotubes. Imogolite is a subject of interest in the pedological field, but to date there has been no bioapplications of this substance. In this study, we investigated the cellular response of osteoblast-like cells to imogolite scaffolds. To reveal the morphology, proliferation and osteoblastic functional mineralization, we cultured human osteoblast-like cells (Saos-2) and mouse osteoblast-like cells (MC3T3-E1) on the scaffolds. The surface characteristics of the imogolite scaffold were drastically changed depending on the amount of imogolite on the dish. With the increase of imogolite concentration, the surface morphology of scaffolds changed from an island-like shape in random orientation to a self-organized fiber texture aligned in the same direction, and finally full coverage in a random orientation with plural layers. Both types of osteoblast were widely spread on the imogolite scaffolds compared to their appearance in a conventional culture dish (control). The proliferation of the two types of osteoblast showed potentially useful trends. In cellular function, there was greater mineralization of both types of osteoblast on imogolite scaffolds than that of the control. Saos-2 and MC3T3-E1 cells showed good biocompatibility in addition to the enhanced osteoblastic mineralization. Therefore, imogolite is expected to be useful as a scaffold material for bone tissue engineering.

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“…The tube diameter is determined by the stoichiometry of the material and can be tailored, for example, by substituting Ge for Si atoms. [15,17,20] Even though various applications of imogolite tubes have been proposed so far, [21][22][23][24] the research effort given to this material is much less extensive than that for other nanotube types. In particular, investigations of possible applications in electronic and optoelectronic devices are still at a very preliminary stage.…”

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confidence: 99%

Shielding Nanowires and Nanotubes with Imogolite: A Route to Nanocables

Kuc¹,

Heine²

2009

Advanced Materials

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The use of an imogolite (aluminosilicate) sheath to protect a conducting core consisting of a carbon nanotube (CNT) or nanowire from mechanical and chemical attacks is proposed. The cross-sectional structure of such a nanocable is shown in the figure. The most stable CNT@ imogolite nanocable is calculated to have a tube-tube distance of 2.8 Å and an insertion energy of ca. 60 meV per carbon atom.

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Characterization of synthetic imogolite nanotubes as gas storage

Cited by 68 publications

References 12 publications

The Effect of Dissolved Humic Acids on Aluminosilicate Formation and Associated Carbon Sequestration

The Effect of Dissolved Humic Acids on Aluminosilicate Formation and Associated Carbon Sequestration

Osteoblastic cellular responses to aluminosilicate nanotubes, imogolite using Saos-2 and MC3T3-E1 cells

Shielding Nanowires and Nanotubes with Imogolite: A Route to Nanocables

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