Pore structure changes in free-standing single-wall carbon nanotube film on vacuum high-temperature annealing

Kamijyou, Yuito; Kukobat, Radovan; Furuse, Ayumi; Otsuka, Hayato; Fujisawa, Kazunori; Hayashi, T.; Sakai, Toshio; Kaneko, Katsumi

doi:10.1016/j.cartre.2022.100230

Cited by 3 publications

(2 citation statements)

References 49 publications

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“…Additionally, the vacuum heating at 2073 K leads to the oxidation resistivity of the SWCNT film; the oxidation begins at 870 and 930 K before and after the heating, respectively. The preceding studies 35,42 showed that the vacuum heating of the SWCNT film at 2073 K removed nanowindows 43 from the graphene wall of SWCNT in addition to the removal of the metal catalysts.…”

Section: ■ Results and Discussionmentioning

confidence: 98%

“…The SWCNT film was washed three times with 20 mL of 1 M nitric acid for 1 h, followed by rinsing with plenty of water to remove the Zn/Al sol–gel dispersant in the dried film. The treated SWCNT film was further purified to remove the trace amounts of the Zn/Al sol–gel dispersant and the iron catalyst for the SWCNT production by vacuum heating at 2073 K for 3 h. This post-heating was necessary for providing highly crystalline and pure SWCNTs . Finally, we air-oxidized the heat-treated SWCNT film to remove the caps by heating at 823 K (heating rate: 1 K/min) under an airflow of 100 mL/min for 1 h.…”

Section: Experimental and Simulation Methodsmentioning

confidence: 99%

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Concentric Structure of Coexistent KCl Core Solution and Water Adlayer Inside a Highly Hydrophobic Single-Wall Carbon Nanotube

Kawamata,

Iiyama,

Futamura

et al. 2024

J. Phys. Chem. C

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The concept of hydrated ions, which is described by the hydration number and the size of the hydrated ion determined with X-ray diffraction measurements, has contributed to understanding ionic solutions. However, we do not understand the effect of ions on the hydrogen-bonded quasi-tetrahedral (T d ) clusters of H 2 O molecules and the beyond-hydrated ion structures, regardless of their crucial importance. The present study applied the intensive confinement effect of a highly hydrophobic single-wall carbon nanotube (SWCNT) to elucidate the correlation of ions with quasi-T d clusters and beyond-hydrated ion structures using KCl solution at 298 K. In situ X-ray diffraction revealed that the water structure confined inside the SWCNT was insensitive to the presence of ions confined in the SWCNT. The GCMC simulation studies showed the stably separated structure of the KCl solution in the central core and the adsorbed water layer akin to the graphene wall of the SWCNT. Newly clarified coexistence of the KCl solution and the water adlayer inside the SWCNT should give new insights into understanding localized heterogeneities in bulk ionic solutions.

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Section: ■ Results and Discussionmentioning

confidence: 98%

Section: Experimental and Simulation Methodsmentioning

confidence: 99%

Concentric Structure of Coexistent KCl Core Solution and Water Adlayer Inside a Highly Hydrophobic Single-Wall Carbon Nanotube

Kawamata,

Iiyama,

Futamura

et al. 2024

J. Phys. Chem. C

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Stochastic desorption of water molecules adsorbed inside single-wall carbon nanotube through nanowindows

Kawamata,

Nagata,

Otsuka

et al. 2024

Adsorption

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Understanding water adsorption/desorption process through nanowindows provides new insights into membrane applications, supercapacitors and elucidation of biological ion separation mechanism. This study evidenced a new stochastic desorption mechanism of water molecules adsorbed inside highly pure single-wall carbon nanotube (SWCNT) through nanowindows, which evidently differs from conventional water desorption mechanism from carbon micropores. This new mechanism was clarified by the comparative analysis of water adsorption/desorption behaviors on endcap-closed SWCNT having nanowindows and endcap-open SWCNT without nanowindows. The water desorption for both open SWCNT samples was deeply associated with unique adsorbed water structures consisting of an ice-like adlayer akin to the graphene wall of SWCNT and core liquid-like water. Nanowindows destabilize the ice-like adlayer, leading to stochastic desorption of water molecules, followed by single-step desorption of adsorbed water through nanowindows of endcap-closed SWCNT having nanowindows. In contrast, water molecules are desorbed from ice-like adlayer and core liquid-like water separately for the endcap-open SWCNT without nanowindows.

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Simulation research on the fluorescence excitation and acquisition of SWNT strain sensor based on the principle of photoluminescence

Zhang,

Zheng,

et al. 2023

2023 4th International Seminar on Artificial Intelligence, Networking and Information Technology (AINIT)

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Pore structure changes in free-standing single-wall carbon nanotube film on vacuum high-temperature annealing

Cited by 3 publications

References 49 publications

Concentric Structure of Coexistent KCl Core Solution and Water Adlayer Inside a Highly Hydrophobic Single-Wall Carbon Nanotube

Concentric Structure of Coexistent KCl Core Solution and Water Adlayer Inside a Highly Hydrophobic Single-Wall Carbon Nanotube

Stochastic desorption of water molecules adsorbed inside single-wall carbon nanotube through nanowindows

Simulation research on the fluorescence excitation and acquisition of SWNT strain sensor based on the principle of photoluminescence

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