Our hearty congratulations to Prof. Suryasarathi Bose who is among this year’s winners of the INAE Young Engineer Award of the Indian National Academy of Engineering.
R. Prasad in The Hindu: IISc researchers produce a superior water filter:
A membrane capable of producing safe drinking water by filtering out objects at the nanoscale level and killing the commonly found pathogenic bacteria E. coli has been developed by a team led by Dr. Suryasarathi Bose, Assistant Professor, Department of Materials Engineering, IISc, Bengaluru.
The membrane is produced by mixing two polymers — poly(vinylidene fluoride) (PVDF) and poly(methyl methacrylate) (PMMA) — that become miscible at about 220 degree C. While PVDF crystallises during cooling, PMMA does not and separates out; the PMMA is removed using a solvent. This property of selective crystallisation and separation is taken advantage of to produce a nano-porous membrane.
In the R. Prasad reports in The Hindu‘s Science and Technology page today: IISc: novel membrane filters water, kills bacteria. The report is about a recent paper from Prof. Suryasarathi Bose‘s group.
A low-cost water purification membrane capable of filtering out objects greater than one micron size and also killing E. coli bacteria has been developed by the Bangalore-based Indian Institute of Science (IISc) researchers and Steer Engineering Pvt. Ltd, Bangalore. The results of the study were published recently in the Journal of Materials Chemistry A.
The novel membrane with pores as small as 0.57-0.68 microns was developed by mixing two polymers — polyethylene (PE) and polyethylene oxide (PEO) — at 180 degree C. Unlike PE, PEO is water-soluble and the two polymers are immiscible.
“We want them to be immiscible as we want to remove one of them, in this case the PEO which is water soluble,” said Dr. Suryasarathi Bose, Assistant Professor, Department of Materials Engineering, IISc. He is the corresponding author of the paper. Tiny holes came into being once the water-soluble polymer was removed.