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대한환경공학회 대한환경공학회지 대한환경공학회지 제26권 제7호
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    초록·키워드

    In this study, atomic force microscopy (AFM) with bio-probe was used to measure interaction forces between membrane surfaces and S. cerevisiae within several hundred nanometers. S. cerevisiae was adhered at the end of the tipless cantilever, which had the spring constant of 0.32 N/m. Experiments were done at various pH, ionic concentration using NaCl, and membrane materials. Results showed that the adhesion force between MX50 membrane and S. cerevisiae was increased to 4.23 nN as solution pH was decreased to 3.5 by stabilization and neutralization of negatively-charged functional groups on the membrane and S. cerevisiae surfaces. Also, as increasing NaCl concentration in the solution, adhesion forces were increased from 0.8 nN at 1 mM to 2.5 nN at 100 mM by electrical double layer compaction on membrane and S. cerevisiae surfaces. The hydrophobic EW membrane gave an order of stronger adhesion forces than hydrophilic MX50 membrane. Considering these results, operations at lower pH, higher ionic strength and the use of hydrophobic membrane may result faster membrane biofouling.

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      UCI(KEPA) : I410-ECN-0101-2017-539-001522617