Carbon nanotube plane fastener

Hirahara, Kaori; Ajioka, Shoichi; Nakayama, Yoshikazu

doi:10.1063/1.3651085

Cited by 4 publications

(1 citation statement)

References 11 publications

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“…Before a catalytic layer of Fe was deposited on Si (5 9 5 mm for ND; 10 9 10 mm for OU) or synthetic substrates (3 mm diameter for ND), an Al 2 O 3 buffer layer was deposited. Detailed synthesis procedures are described in Hirahara et al (2011) and Nakayama (2009, 2012). For the INAA and IPAA, a fraction of the as-grown VACNTs was removed from the substrates and analyzed without any precleaning.…”

Section: Samplesmentioning

confidence: 99%

The effects of possible contamination by sample holders on samples to be returned by Hayabusa2

Shirai

Karouji

Kumagai

et al. 2020

Meteorit & Planetary Scien

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Chemical compositions of materials used for new sample holders (vertically aligned carbon nanotubes [VACNTs] and polyimide film), which were developed for the analysis of Hayabusa2‐return samples, were determined by instrumental neutron activation analysis and/or instrumental photon activation analysis, to estimate contamination effects from the sample holders. The synthetic quartz plate used for the sample holders was also analyzed. Ten elements (Na, Al, Cr, Mn, Fe, Ni, Eu, W, Au, and Th) and 14 elements (Na, Al, K, Sc, Ti, Cr, Zn, Ga, Br, Sb, La, Eu, Ir, and Au) could be detected in the VACNTs and polyimide film, respectively. The VACNT data show that contamination by this material with respect to the Murchison meteorite is negligible in terms of the elemental ratios (e.g., Fe/Mn, Na/Al, and Mn/Cr) used for the classification of meteorites due to the extremely low density of VACNTs. However, for the Au/Cr ratio, even small degrees (1.7 wt%) of contamination by VACNTs will change the Au/Cr ratio. Elemental ratios used for the classification of meteorites are only influenced by large amounts of contamination (>60 wt%) of polyimide film, which is unlikely to occur. In contrast, detectable effects on Ti isotopic compositions are caused by >0.1 and >0.3 wt% contamination by VACNTs and polyimide film, respectively, and Hf isotopic changes are caused by >0.1 wt% contamination by VACNTs. The new sample holders (VACNTs and polyimide film) are suitable for chemical classification of Hayabusa2‐return samples, because of their ease of use, applicability to multiple analytical instruments, and low contamination levels for most elements.

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Section: Samplesmentioning

confidence: 99%

The effects of possible contamination by sample holders on samples to be returned by Hayabusa2

Shirai

Karouji

Kumagai

et al. 2020

Meteorit & Planetary Scien

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Ultra-flexible spiked-shell microparticles of aerographite

Hirahara

Hiraishi

Imadate

et al. 2017

Carbon

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Development of a sample holder for synchrotron radiation-based computed tomography and diffraction analysis of extraterrestrial materials

Uesugi

Hirahara

Uesugi

et al. 2020

Review of Scientific Instruments

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A sample holder for a suite of synchrotron radiation measurements on extraterrestrial materials, which are fragile and irregularly shaped, was developed using carbon nanotubes and polyimide. The holder enables investigation of such samples with multiple analytical instruments, which means that we can reduce the number of sample transfers between holders. The holder developed in our study also enables investigation of such samples without exposure to the terrestrial atmosphere, which contains abundant contaminants, such as water vapor and organic substances. The stability of the samples in the holder during the measurements and disturbance of the analysis result by the holder were evaluated, which showed that sample drift motion and image disturbance due to x-ray attenuation and scattering of the holder materials are insignificant.

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Carbon nanotube plane fastener

Cited by 4 publications

References 11 publications

The effects of possible contamination by sample holders on samples to be returned by Hayabusa2

The effects of possible contamination by sample holders on samples to be returned by Hayabusa2

Ultra-flexible spiked-shell microparticles of aerographite

Development of a sample holder for synchrotron radiation-based computed tomography and diffraction analysis of extraterrestrial materials

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