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Micromachined nanocrystalline graphite membranes for gas separation

Micromachined nanocrystalline graphite membranes for gas separation
Micromachined nanocrystalline graphite membranes for gas separation
Carbon nanoporous membranes show promising performance for the passive separation and sieving of different gases, for example for helium and hydrogen separation. In this paper, nanocrystalline graphite (or nanographite) has been evaluated as a membrane material for molecular sieving of helium and hydrogen from larger gas constituents. Nanographite of 350 nm thickness was prepared using plasma-enhanced chemical vapour deposition onto fused silica substrates, from which membranes were microfabricated using deep wet etching. Permeability of hydrogen and helium were 1.79 ×10^-16 and 1.40×10^-16 mol·m·m^-2·s^-1·Pa^-1 at 150 °C respectively, and measured separation was 48 for He/Ne, >135 for H2/CO2 and >1000 for H2/O2. The gas separation properties of the nanographite membranes were tested in the temperature range of 25 to 150 °C, and the permeation measurements show nanographite to be highly selective of helium and hydrogen over all larger gas molecules, including neon.
0008-6223
Fishlock, S.J.
b35c425e-91f5-40a1-b3a7-d2939463fb19
Pu, S.H.
75e2711b-094d-4c38-8f08-65ee1377bc28
Bhattacharya, G.
9139df2b-4d21-4cd2-89f0-0e7560def4b9
Han, Y.
b646e8d1-a004-4c00-b53d-a1730bb66c08
McLaughlin, J.
616c2664-e1ff-4556-b45b-89c707ebeec8
Mcbride, J.W.
d9429c29-9361-4747-9ba3-376297cb8770
Chong, H.M.H.
795aa67f-29e5-480f-b1bc-9bd5c0d558e1
O'Shea, S.J.
74a6cb65-ab4d-4e11-9f6f-68e5befe4f53
Fishlock, S.J.
b35c425e-91f5-40a1-b3a7-d2939463fb19
Pu, S.H.
75e2711b-094d-4c38-8f08-65ee1377bc28
Bhattacharya, G.
9139df2b-4d21-4cd2-89f0-0e7560def4b9
Han, Y.
b646e8d1-a004-4c00-b53d-a1730bb66c08
McLaughlin, J.
616c2664-e1ff-4556-b45b-89c707ebeec8
Mcbride, J.W.
d9429c29-9361-4747-9ba3-376297cb8770
Chong, H.M.H.
795aa67f-29e5-480f-b1bc-9bd5c0d558e1
O'Shea, S.J.
74a6cb65-ab4d-4e11-9f6f-68e5befe4f53

Fishlock, S.J., Pu, S.H., Bhattacharya, G., Han, Y., McLaughlin, J., Mcbride, J.W., Chong, H.M.H. and O'Shea, S.J. (2018) Micromachined nanocrystalline graphite membranes for gas separation. Carbon. (doi:10.1016/j.carbon.2018.05.071).

Record type: Article

Abstract

Carbon nanoporous membranes show promising performance for the passive separation and sieving of different gases, for example for helium and hydrogen separation. In this paper, nanocrystalline graphite (or nanographite) has been evaluated as a membrane material for molecular sieving of helium and hydrogen from larger gas constituents. Nanographite of 350 nm thickness was prepared using plasma-enhanced chemical vapour deposition onto fused silica substrates, from which membranes were microfabricated using deep wet etching. Permeability of hydrogen and helium were 1.79 ×10^-16 and 1.40×10^-16 mol·m·m^-2·s^-1·Pa^-1 at 150 °C respectively, and measured separation was 48 for He/Ne, >135 for H2/CO2 and >1000 for H2/O2. The gas separation properties of the nanographite membranes were tested in the temperature range of 25 to 150 °C, and the permeation measurements show nanographite to be highly selective of helium and hydrogen over all larger gas molecules, including neon.

Text Micromachined nanocrystalline graphite membranes for gas separation Accepted - Accepted Manuscript
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Accepted/In Press date: 29 May 2018
e-pub ahead of print date: 4 June 2018

Identifiers

Local EPrints ID: 421522
URI: https://eprints.soton.ac.uk/id/eprint/421522
ISSN: 0008-6223
PURE UUID: 211845dc-611a-4f25-b888-6c28809e2d39
ORCID for H.M.H. Chong: ORCID iD orcid.org/0000-0002-7110-5761

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Date deposited: 14 Jun 2018 16:30
Last modified: 18 Jul 2018 00:31

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Contributors

Author: S.J. Fishlock
Author: S.H. Pu
Author: G. Bhattacharya
Author: Y. Han
Author: J. McLaughlin
Author: J.W. Mcbride
Author: H.M.H. Chong ORCID iD
Author: S.J. O'Shea

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