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(11)

EP 2 838 856 A1

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(43) Date of publication: 25.02.2015 Bulletin 2015/09 (21) Application number: 13778465.8 (22) Date of filing: 18.04.2013

(51) International Patent Classification (IPC):  C02F 3/34(2006.01) C02F 9/14(2006.01) C02F 3/30(2006.01) C02F 3/12(2006.01) C02F 3/28(2006.01) (86) International application number: PCT/SG2013/000154 (87) International publication number: WO 2013/158043 (24.10.2013 Gazette 2013/43)

(84) Designated Contracting States: AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR Designated Extension States: BA ME (30) Priority: 18.04.2012 US 201261635035 P (71) Applicant: Nanyang Technological University Singapore 639798 (SG)	(72) Inventors: ZHOU, Yan Singapore 639798 (SG) ZHANG, Sheng Singapore 639798 (SG) NG, Wun Jern Singapore 639798 (SG) (74) Representative: Talbot-Ponsonby, Daniel Frederick  Marks & Clerk LLP Fletcher House Heatley Road The Oxford Science Park Oxford OX4 4GE Oxford OX4 4GE (GB)