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Sunday, 22 September 2019
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Raw materials & technologies

Selectively functionalised nanoporous membranes show anti(bio)fouling properties

Wednesday, 26 June 2013

Researchers from Leibniz Institute of Polymer Research Dresden and Technische Universität Dresden have prepared antifouling and antibacterial membranes by selective surface modification of pH responsive polystyrene-b-poly(4-vinylpyridine) (PS-P4VP) diblock copolymers by quaternization and zwitterionization reactions on a P4VP moiety.

Modified nanoporous membranes show antifouling and antibacterial properties 

Source: Limnomar

Modified nanoporous membranes show antifouling and antibacterial properties 

Source: Limnomar

 Nanoporous membranes, based on the self-assembly of 2-(4′-hydroxybenzeneazo) benzoic acid (HABA)–PS-P4VP supramolecular complexes and nonsolvent induced phase separation, were first prepared and the surfaces were functionalised by crosslinking with diiodobutane vapours and reacting with propane sultone vapours at moderate temperature and under vacuum conditions. Selective functionalisation of surfaces was carried out to enhance the antifouling and antibiofouling properties of the membrane and to retain its pH switching behavior.

The membranes were thoroughly characterised by various instrumental techniques such as Fourier transform infrared spectroscopy (FT-IR), X-ray photoelectron spectroscopy, scanning electron microscopy (SEM), quartz crystal microbalance, contact angle, etc.

Analysis of antifouling properties with bovine serum albumin protein

Antifouling and antibacterial properties were proven by analysing the adsorption of bovine serum albumin protein and bacterial cell attachment and killing efficiency. The actual membrane performance was assessed in terms of water flux under different pressures and pHs and Congo red dye rejection efficiency.

This study appeared in: Journal of Materials Chemistry B, 2013, Volume 1, Issue 27, pp 3397-3409.

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