Comparison of Humic Acid Adhesion with Water on Different Nanofiltration Membrane (NF90, NF270

In this study, we tried to perform few experiments for comparing the adhesion force on NF90 and NF270 surface for water and humic-acid. We performed several experiments with 3 microL water and humic-acid at zero-g (Zero Normal Force) and we used centrifugal force to slid the drop on the surface. We compared the lateral force needed to slide the water drop and humic-acid drop. Comparison of lateral force at 3 rpm/s2 and 0.5 rpm/s 2 are done also for both water and humic-acid. The NF270 surface did not show promising results but we did get satisfactory results from NF90 surface.;A comparison of Gs modulus has done based on the previous study. We calculated Gs modulus for both water and humic acid experiment. We tried to find the force for which the drop start sliding for the first time and for that force we calculated Gs modulus in this study for NF90 surface.