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|a (DE-627)NLM160542111
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|a (NLM)16459613
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|a DE-627
|b ger
|c DE-627
|e rakwb
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|a eng
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|a Jakubek, Zygmunt J
|e verfasserin
|4 aut
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|a Two confined phases of argon adsorbed inside open single walled carbon nanotubes
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|c 2004
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|a Text
|b txt
|2 rdacontent
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|a ohne Hilfsmittel zu benutzen
|b n
|2 rdamedia
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|a Band
|b nc
|2 rdacarrier
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|a Date Completed 20.03.2007
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|a Date Revised 26.10.2019
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|a published: Print
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|a Citation Status MEDLINE
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|a Isothermal adsorption of Ar on single walled carbon nanotubes (SWNTs) has been studied at 77 and 87 K. The SWNTs have been grown by laser vaporization of a graphite pellet containing 0.6% (atomic) Ni/Co catalyst. The nanotubes have been prepared for argon adsorption measurements by prolonged outgassing of as-grown material in a vacuum at room temperature (295 K), at elevated temperatures of up to 475 K, and by oxidization for 2 h in dry air at 470 K. Formation of two condensed phases of Ar in the interior of SWNTs has been observed at 77 K. The low-density phase is formed at 155(5) microTorr, while the high-density phase, at 120(5) microTorr. At 87 K, only a single phase has been observed at 185(5) microTorr. Condensation at both 77 and 87 K appears to be the first-order phase transition. Onset of the quasi-one-dimensional linear (one-channel) phase and the quasi-two-dimensional monolayer (six-channel) phase formation on the external surface of bundles has been observed at 77 K near 0.0017 and 0.8 Torr, respectively, and at 87 K near 0.018 and 5 Torr, respectively. Isosteric heats of adsorption for the one-channel phase, the first external layer, and the second external layer have been determined to be equal to 137, 107, and 70 meV, respectively
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|a Journal Article
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|a Research Support, Non-U.S. Gov't
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|a Nanotubes, Carbon
|2 NLM
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|a Argon
|2 NLM
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|a 67XQY1V3KH
|2 NLM
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|a Simard, Benoit
|e verfasserin
|4 aut
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|i Enthalten in
|t Langmuir : the ACS journal of surfaces and colloids
|d 1992
|g 20(2004), 14 vom: 06. Juli, Seite 5940-5
|w (DE-627)NLM098181009
|x 1520-5827
|7 nnns
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| 773 |
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|g volume:20
|g year:2004
|g number:14
|g day:06
|g month:07
|g pages:5940-5
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|a GBV_ILN_721
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|a AR
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|d 20
|j 2004
|e 14
|b 06
|c 07
|h 5940-5
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