Phase diagram of 4He film in 3D nanopores of ZTC

Yuna Nakashima; Taku Matsushita; Mitsunori Hieda; Nobuo Wada; Hirotomo Nishihara; Takashi Kyotani

doi:10.1007/s10909-010-0321-1

Phase diagram of ⁴He film in 3D nanopores of ZTC

Yuna Nakashima, Taku Matsushita, Mitsunori Hieda, Nobuo Wada, Hirotomo Nishihara, Takashi Kyotani

Research output: Contribution to journal › Article › peer-review

5 Citations (Scopus)

Abstract

In the study to examine effects of three-dimensional (3D) film connectivity on superfluid ⁴He film in the pore network, we have measured heat capacities of ⁴He film adsorbed in zeolite templated carbon (ZTC), which is an assembly of graphene fragments and has network of 1.2 nm pore with the 3D period of 1.4 nm, shorter than those of nanoporous materials studied so far. From the heat of desorption, the ⁴He film adsorbed in ZTC was observed to be formed up to about 1.4 atomic layers. Heat capacities of the ⁴He film are rather similar to those on SiO ₂-based porous materials than those on graphite, except for large heat capacities of monolayer ⁴He film. At low coverages, the heat capacity rapidly decreases below a temperature T _L, suggesting a localized state of ⁴He at T<T _L. The T _L almost monotonically lowers with increasing the coverage. Heat capacity isotherms show maxima around 1.1 layers, which suggests quantum degenerate fluid (Bose fluid) above the coverage. From these results, the phase diagram of ⁴He film adsorbed in ZTC has been determined.

Original language	English
Pages (from-to)	565-572
Number of pages	8
Journal	Journal of Low Temperature Physics
Volume	162
Issue number	5-6
DOIs	https://doi.org/10.1007/s10909-010-0321-1
Publication status	Published - 2011 Mar

Keywords

3D nanopores
He film
Phase diagram
Restricted geometry
Zeolite templated carbon (ZTC)

ASJC Scopus subject areas

Atomic and Molecular Physics, and Optics
Materials Science(all)
Condensed Matter Physics

Access to Document

10.1007/s10909-010-0321-1

Cite this

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title = "Phase diagram of 4He film in 3D nanopores of ZTC",

abstract = "In the study to examine effects of three-dimensional (3D) film connectivity on superfluid 4He film in the pore network, we have measured heat capacities of 4He film adsorbed in zeolite templated carbon (ZTC), which is an assembly of graphene fragments and has network of 1.2 nm pore with the 3D period of 1.4 nm, shorter than those of nanoporous materials studied so far. From the heat of desorption, the 4He film adsorbed in ZTC was observed to be formed up to about 1.4 atomic layers. Heat capacities of the 4He film are rather similar to those on SiO 2-based porous materials than those on graphite, except for large heat capacities of monolayer 4He film. At low coverages, the heat capacity rapidly decreases below a temperature T L, suggesting a localized state of 4He at T<T L. The T L almost monotonically lowers with increasing the coverage. Heat capacity isotherms show maxima around 1.1 layers, which suggests quantum degenerate fluid (Bose fluid) above the coverage. From these results, the phase diagram of 4He film adsorbed in ZTC has been determined.",

keywords = "3D nanopores, He film, Phase diagram, Restricted geometry, Zeolite templated carbon (ZTC)",

author = "Yuna Nakashima and Taku Matsushita and Mitsunori Hieda and Nobuo Wada and Hirotomo Nishihara and Takashi Kyotani",

note = "Funding Information: Acknowledgements We would like to thank T. Kurokawa for technical support. This research was partly supported by Grant-in-Aid for Scientific Research (Grant No. 17071006) from the Ministry of Education, Culture, Sports, Science and Technology of Japan. And, two of authors (T.M. and M.H.) were also supported in part by JSPS Institutional Program for Young Researcher Overseas Visits.",

year = "2011",

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doi = "10.1007/s10909-010-0321-1",

language = "English",

volume = "162",

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AU - Nakashima, Yuna

AU - Matsushita, Taku

AU - Hieda, Mitsunori

AU - Wada, Nobuo

AU - Nishihara, Hirotomo

AU - Kyotani, Takashi

N1 - Funding Information: Acknowledgements We would like to thank T. Kurokawa for technical support. This research was partly supported by Grant-in-Aid for Scientific Research (Grant No. 17071006) from the Ministry of Education, Culture, Sports, Science and Technology of Japan. And, two of authors (T.M. and M.H.) were also supported in part by JSPS Institutional Program for Young Researcher Overseas Visits.

PY - 2011/3

Y1 - 2011/3

N2 - In the study to examine effects of three-dimensional (3D) film connectivity on superfluid 4He film in the pore network, we have measured heat capacities of 4He film adsorbed in zeolite templated carbon (ZTC), which is an assembly of graphene fragments and has network of 1.2 nm pore with the 3D period of 1.4 nm, shorter than those of nanoporous materials studied so far. From the heat of desorption, the 4He film adsorbed in ZTC was observed to be formed up to about 1.4 atomic layers. Heat capacities of the 4He film are rather similar to those on SiO 2-based porous materials than those on graphite, except for large heat capacities of monolayer 4He film. At low coverages, the heat capacity rapidly decreases below a temperature T L, suggesting a localized state of 4He at T<T L. The T L almost monotonically lowers with increasing the coverage. Heat capacity isotherms show maxima around 1.1 layers, which suggests quantum degenerate fluid (Bose fluid) above the coverage. From these results, the phase diagram of 4He film adsorbed in ZTC has been determined.

AB - In the study to examine effects of three-dimensional (3D) film connectivity on superfluid 4He film in the pore network, we have measured heat capacities of 4He film adsorbed in zeolite templated carbon (ZTC), which is an assembly of graphene fragments and has network of 1.2 nm pore with the 3D period of 1.4 nm, shorter than those of nanoporous materials studied so far. From the heat of desorption, the 4He film adsorbed in ZTC was observed to be formed up to about 1.4 atomic layers. Heat capacities of the 4He film are rather similar to those on SiO 2-based porous materials than those on graphite, except for large heat capacities of monolayer 4He film. At low coverages, the heat capacity rapidly decreases below a temperature T L, suggesting a localized state of 4He at T<T L. The T L almost monotonically lowers with increasing the coverage. Heat capacity isotherms show maxima around 1.1 layers, which suggests quantum degenerate fluid (Bose fluid) above the coverage. From these results, the phase diagram of 4He film adsorbed in ZTC has been determined.

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KW - Phase diagram

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