Title:
A GRAPHENE-BASED MEMBRANE
Document Type and Number:
WIPO Patent Application WO/2019/139542
Kind Code:
A1
Abstract:
There is provided a graphene-based membrane, particularly a free-standing one, comprising: a plurality of partially oxidised few-layer graphene (POFG) sheets; and a polymer for interconnecting the plurality of POFG sheets in a matrix. In the preferred embodiment, the polymer is water-based polymer. There is also provided a method of forming the free-standing graphene-based membrane; and a method of preparing the POFG sheets, comprising: electrochemically exfoliating graphite to form intercalated graphite powder; expanding the intercalated graphite powder to form few-layer graphene (FG); and partially oxidizing the FG with an oxidizing agent for a pre-determined period of time to form POFG sheets.
Inventors:
LOH KIAN PING (SG)
MANGA KIRAN KUMAR (SG)
BALAPANURU JANARDHAN (SG)
MANGA KIRAN KUMAR (SG)
BALAPANURU JANARDHAN (SG)
Application Number:
PCT/SG2019/050021
Publication Date:
July 18, 2019
Filing Date:
January 15, 2019
Export Citation:
Assignee:
NAT UNIV SINGAPORE (SG)
GRAFOID INC (CA)
GRAFOID INC (CA)
International Classes:
B01D71/02; B01D67/00; B01D69/14; C01B32/19
Domestic Patent References:
| WO2008130431A2 | 2008-10-30 | |||
| WO2017044845A1 | 2017-03-16 |
Other References:
WANG, J. ET AL.: "High-Yield Synthesis of Few-Layer Graphene Flakes through Electrochemical Expansion of Graphite in Propylene Carbonate Electrolyte", JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, vol. 133, no. 23, 10 March 2011 (2011-03-10), pages 8888 - 8891, XP055115631, [retrieved on 20190213]
KIM. S. ET AL.: "Few-layer-graphene with high yield and low sheet resistance via mild oxidation of natural graphite", RSC ADVANCES, vol. 7, no. 57, 17 July 2017 (2017-07-17), pages 35717 - 35723, XP055625375, [retrieved on 20190213]
PARK, J. ET AL.: "Porous graphene-based membranes for water purification from metal ions at low differential pressures", NANOSCALE, vol. 8, 21 April 2016 (2016-04-21), pages 9563 - 9571, XP055625376, [retrieved on 20190213]
BALAPANURU, J. ET AL.: "Desalination properties of a free-standing, partially oxidized few-layer graphene membrane", DESALINATION, vol. 451, 7 August 2018 (2018-08-07), pages 72 - 80, XP055625380, [retrieved on 20190213]
See also references of EP 3740305A4
KIM. S. ET AL.: "Few-layer-graphene with high yield and low sheet resistance via mild oxidation of natural graphite", RSC ADVANCES, vol. 7, no. 57, 17 July 2017 (2017-07-17), pages 35717 - 35723, XP055625375, [retrieved on 20190213]
PARK, J. ET AL.: "Porous graphene-based membranes for water purification from metal ions at low differential pressures", NANOSCALE, vol. 8, 21 April 2016 (2016-04-21), pages 9563 - 9571, XP055625376, [retrieved on 20190213]
BALAPANURU, J. ET AL.: "Desalination properties of a free-standing, partially oxidized few-layer graphene membrane", DESALINATION, vol. 451, 7 August 2018 (2018-08-07), pages 72 - 80, XP055625380, [retrieved on 20190213]
See also references of EP 3740305A4
Attorney, Agent or Firm:
PATEL, Upasana (SG)
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